From 697214132d94ac7e8484f894ab9cfa8d82ada012 Mon Sep 17 00:00:00 2001
From: "Adam D. Ruppe" <destructionator@gmail.com>
Date: Mon, 23 Sep 2024 16:10:41 -0400
Subject: [PATCH] port of commommark for my use
---
markdown.d | 9529 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 9529 insertions(+)
create mode 100644 markdown.d
diff --git a/markdown.d b/markdown.d
new file mode 100644
index 0000000..2675c57
--- /dev/null
+++ b/markdown.d
@@ -0,0 +1,9529 @@
+/++
+
+MD4C: Markdown parser for C
+(http://github.com/mity/md4c)
+
+Copyright:
+
+Copyright (c) 2016-2019 Martin Mitas
+Copyright (c) 2019 Guillaume Piolat (D translation as commonmarkd package: https://github.com/AuburnSounds/commonmark-d )
+Somewhat modified by Adam D. Ruppe in 2024.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.
++/
+module arsd.markdown;
+
+/// Options for Markdown parsing.
+enum MarkdownFlag : int
+{
+ collapseWhitespace = 0x0001, /** Collapse non-trivial whitespace into single ' ' */
+ permissiveATXHeaders = 0x0002, /** Do not require space in ATX headers ( ###header ) */
+ permissiveURLAutoLinks = 0x0004, /** Recognize URLs as autolinks even without '<', '>' */
+ permissiveEmailAutoLinks = 0x0008, /** Recognize e-mails as autolinks even without '<', '>' and 'mailto:' */
+ noIndentedCodeBlocks = 0x0010, /** Disable indented code blocks. (Only fenced code works.) */
+ noHTMLBlocks = 0x0020, /** Disable raw HTML blocks. */
+ noHTMLSpans = 0x0040, /** Disable raw HTML (inline). */
+ tablesExtension = 0x0100, /** Enable tables extension. */
+ enableStrikeThrough = 0x0200, /** Enable strikethrough extension. */
+ permissiveWWWAutoLinks = 0x0400, /** Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */
+ enableTaskLists = 0x0800, /** Enable task list extension. */
+ latexMathSpans = 0x1000, /** Enable $ and $$ containing LaTeX equations. */
+
+ permissiveAutoLinks = permissiveEmailAutoLinks | permissiveURLAutoLinks | permissiveWWWAutoLinks, /** Recognize e-mails, URL and WWW links */
+ noHTML = noHTMLBlocks | noHTMLSpans, /** Disable raw HTML. */
+
+ /* Convenient sets of flags corresponding to well-known Markdown dialects.
+ *
+ * Note we may only support subset of features of the referred dialect.
+ * The constant just enables those extensions which bring us as close as
+ * possible given what features we implement.
+ *
+ * ABI compatibility note: Meaning of these can change in time as new
+ * extensions, bringing the dialect closer to the original, are implemented.
+ */
+ dialectCommonMark = 0, /** CommonMark */
+ dialectGitHub = (permissiveAutoLinks | tablesExtension | enableStrikeThrough | enableTaskLists), /** Github Flavoured Markdown */
+}
+
+/// Parses a Markdown input, returns HTML. `flags` set the particular Markdown dialect that is used.
+string convertMarkdownToHTML(const(char)[] input, MarkdownFlag flags = MarkdownFlag.dialectCommonMark)
+{
+ import core.stdc.stdlib;
+
+ static struct GrowableBuffer
+ {
+ nothrow:
+ @nogc:
+ char* buf = null;
+ size_t size = 0;
+ size_t allocated = 0;
+
+ void ensureSize(size_t atLeastthisSize)
+ {
+ if (atLeastthisSize > allocated)
+ {
+ allocated = 2 * allocated + atLeastthisSize + 1; // TODO: enhancing this estimation probably beneficial to performance
+ buf = cast(char*) realloc(buf, allocated);
+ }
+
+ }
+
+ ~this()
+ {
+ if (buf)
+ {
+ free(buf);
+ buf = null;
+ size = 0;
+ allocated = 0;
+ }
+ }
+
+ void append(const(char)[] suffix)
+ {
+ size_t L = suffix.length;
+ ensureSize(size + L);
+ buf[size..size+L] = suffix[0..L];
+ size += L;
+ }
+
+ const(char)[] getData()
+ {
+ return buf[0..size];
+ }
+
+ static void appendCallback(const(char)* chars, uint size, void* userData)
+ {
+ GrowableBuffer* gb = cast(GrowableBuffer*) userData;
+ gb.append(chars[0..size]);
+ }
+ }
+
+ GrowableBuffer gb;
+ gb.ensureSize(input.length); // TODO: enhancing this estimation probably beneficial to performance
+
+ //int renderFlags = MD_RENDER_FLAG_DEBUG;
+ int renderFlags = 0;
+
+ int ret = md_render_html(input.ptr,
+ cast(uint) input.length,
+ &GrowableBuffer.appendCallback,
+ &gb, flags, renderFlags);
+ return gb.getData.idup; // Note: this is the only GC-using stuff
+}
+
+
+
+
+import core.stdc.string;
+import core.stdc.stdio;
+import core.stdc.stdlib: malloc, free;
+
+nothrow:
+@nogc:
+@system:
+
+// Compatibility with older DMDFE
+static if (__VERSION__ < 2079)
+{
+ import core.stdc.stdlib: _compare_fp_t;
+ // Provide @nogc nothrow bsearch and qsort for older compilers
+ extern (C):
+ @system:
+ inout(void)* bsearch(scope const void* key, scope inout(void)* base, size_t nmemb, size_t size, _compare_fp_t compar);
+ void qsort(scope void* base, size_t nmemb, size_t size, _compare_fp_t compar);
+}
+else
+{
+ import core.stdc.stdlib: qsort, bsearch;
+}
+
+alias MD_CHAR = char;
+alias MD_SIZE = uint;
+alias MD_OFFSET = uint;
+
+/* Block represents a part of document hierarchy structure like a paragraph
+ * or list item.
+ */
+alias MD_BLOCKTYPE = int;
+enum : MD_BLOCKTYPE
+{
+ /* <body>...</body> */
+ MD_BLOCK_DOC = 0,
+
+ /* <blockquote>...</blockquote> */
+ MD_BLOCK_QUOTE,
+
+ /* <ul>...</ul>
+ * Detail: Structure MD_BLOCK_UL_DETAIL. */
+ MD_BLOCK_UL,
+
+ /* <ol>...</ol>
+ * Detail: Structure MD_BLOCK_OL_DETAIL. */
+ MD_BLOCK_OL,
+
+ /* <li>...</li>
+ * Detail: Structure MD_BLOCK_LI_DETAIL. */
+ MD_BLOCK_LI,
+
+ /* <hr> */
+ MD_BLOCK_HR,
+
+ /* <h1>...</h1> (for levels up to 6)
+ * Detail: Structure MD_BLOCK_H_DETAIL. */
+ MD_BLOCK_H,
+
+ /* <pre><code>...</code></pre>
+ * Note the text lines within code blocks are terminated with '\n'
+ * instead of explicit MD_TEXT_BR. */
+ MD_BLOCK_CODE,
+
+ /* Raw HTML block. This itself does not correspond to any particular HTML
+ * tag. The contents of it _is_ raw HTML source intended to be put
+ * in verbatim form to the HTML output. */
+ MD_BLOCK_HTML,
+
+ /* <p>...</p> */
+ MD_BLOCK_P,
+
+ /* <table>...</table> and its contents.
+ * Detail: Structure MD_BLOCK_TD_DETAIL (used with MD_BLOCK_TH and MD_BLOCK_TD)
+ * Note all of these are used only if extension MD_FLAG_TABLES is enabled. */
+ MD_BLOCK_TABLE,
+ MD_BLOCK_THEAD,
+ MD_BLOCK_TBODY,
+ MD_BLOCK_TR,
+ MD_BLOCK_TH,
+ MD_BLOCK_TD
+}
+
+/* Span represents an in-line piece of a document which should be rendered with
+ * the same font, color and other attributes. A sequence of spans forms a block
+ * like paragraph or list item. */
+alias MD_SPANTYPE = int;
+enum : MD_SPANTYPE
+{
+ /* <em>...</em> */
+ MD_SPAN_EM,
+
+ /* <strong>...</strong> */
+ MD_SPAN_STRONG,
+
+ /* <a href="xxx">...</a>
+ * Detail: Structure MD_SPAN_A_DETAIL. */
+ MD_SPAN_A,
+
+ /* <img src="xxx">...</a>
+ * Detail: Structure MD_SPAN_IMG_DETAIL.
+ * Note: Image text can contain nested spans and even nested images.
+ * If rendered into ALT attribute of HTML <IMG> tag, it's responsibility
+ * of the renderer to deal with it.
+ */
+ MD_SPAN_IMG,
+
+ /* <code>...</code> */
+ MD_SPAN_CODE,
+
+ /* <del>...</del>
+ * Note: Recognized only when MD_FLAG_STRIKETHROUGH is enabled.
+ */
+ MD_SPAN_DEL,
+
+ /* For recognizing inline ($) and display ($$) equations
+ * Note: Recognized only when MD_FLAG_LATEXMATHSPANS is enabled.
+ */
+ MD_SPAN_LATEXMATH,
+ MD_SPAN_LATEXMATH_DISPLAY
+}
+
+/* Text is the actual textual contents of span. */
+alias MD_TEXTTYPE = int;
+enum : MD_TEXTTYPE
+{
+ /* Normal text. */
+ MD_TEXT_NORMAL = 0,
+
+ /* null character. CommonMark requires replacing null character with
+ * the replacement char U+FFFD, so this allows caller to do that easily. */
+ MD_TEXT_NULLCHAR,
+
+ /* Line breaks.
+ * Note these are not sent from blocks with verbatim output (MD_BLOCK_CODE
+ * or MD_BLOCK_HTML). In such cases, '\n' is part of the text itself. */
+ MD_TEXT_BR, /* <br> (hard break) */
+ MD_TEXT_SOFTBR, /* '\n' in source text where it is not semantically meaningful (soft break) */
+
+ /* Entity.
+ * (a) Named entity, e.g.
+ * (Note MD4C does not have a list of known entities.
+ * Anything matching the regexp /&[A-Za-z][A-Za-z0-9]{1,47};/ is
+ * treated as a named entity.)
+ * (b) Numerical entity, e.g. Ӓ
+ * (c) Hexadecimal entity, e.g. ካ
+ *
+ * As MD4C is mostly encoding agnostic, application gets the verbatim
+ * entity text into the MD_RENDERER::text_callback(). */
+ MD_TEXT_ENTITY,
+
+ /* Text in a code block (inside MD_BLOCK_CODE) or inlined code (`code`).
+ * If it is inside MD_BLOCK_CODE, it includes spaces for indentation and
+ * '\n' for new lines. MD_TEXT_BR and MD_TEXT_SOFTBR are not sent for this
+ * kind of text. */
+ MD_TEXT_CODE,
+
+ /* Text is a raw HTML. If it is contents of a raw HTML block (i.e. not
+ * an inline raw HTML), then MD_TEXT_BR and MD_TEXT_SOFTBR are not used.
+ * The text contains verbatim '\n' for the new lines. */
+ MD_TEXT_HTML,
+
+ /* Text is inside an equation. This is processed the same way as inlined code
+ * spans (`code`). */
+ MD_TEXT_LATEXMATH
+}
+
+
+/* Alignment enumeration. */
+
+alias MD_ALIGN = int;
+enum : MD_ALIGN
+{
+ MD_ALIGN_DEFAULT = 0, /* When unspecified. */
+ MD_ALIGN_LEFT,
+ MD_ALIGN_CENTER,
+ MD_ALIGN_RIGHT
+}
+
+
+/* String attribute.
+ *
+ * This wraps strings which are outside of a normal text flow and which are
+ * propagated within various detailed structures, but which still may contain
+ * string portions of different types like e.g. entities.
+ *
+ * So, for example, lets consider an image has a title attribute string
+ * set to "foo " bar". (Note the string size is 14.)
+ *
+ * Then the attribute MD_SPAN_IMG_DETAIL::title shall provide the following:
+ * -- [0]: "foo " (substr_types[0] == MD_TEXT_NORMAL; substr_offsets[0] == 0)
+ * -- [1]: """ (substr_types[1] == MD_TEXT_ENTITY; substr_offsets[1] == 4)
+ * -- [2]: " bar" (substr_types[2] == MD_TEXT_NORMAL; substr_offsets[2] == 10)
+ * -- [3]: (n/a) (n/a ; substr_offsets[3] == 14)
+ *
+ * Note that these conditions are guaranteed:
+ * -- substr_offsets[0] == 0
+ * -- substr_offsets[LAST+1] == size
+ * -- Only MD_TEXT_NORMAL, MD_TEXT_ENTITY, MD_TEXT_NULLCHAR substrings can appear.
+ */
+struct MD_ATTRIBUTE
+{
+ const (MD_CHAR)* text;
+ MD_SIZE size;
+ const (MD_TEXTTYPE)* substr_types;
+ const (MD_OFFSET)* substr_offsets;
+}
+
+
+/* Detailed info for MD_BLOCK_UL. */
+struct MD_BLOCK_UL_DETAIL
+{
+ int is_tight; /* Non-zero if tight list, zero if loose. */
+ MD_CHAR mark; /* Item bullet character in MarkDown source of the list, e.g. '-', '+', '*'. */
+}
+
+/* Detailed info for MD_BLOCK_OL. */
+struct MD_BLOCK_OL_DETAIL
+{
+ uint start; /* Start index of the ordered list. */
+ int is_tight; /* Non-zero if tight list, zero if loose. */
+ MD_CHAR mark_delimiter; /* Character delimiting the item marks in MarkDown source, e.g. '.' or ')' */
+}
+
+/* Detailed info for MD_BLOCK_LI. */
+struct MD_BLOCK_LI_DETAIL
+{
+ int is_task; /* Can be non-zero only with MD_FLAG_TASKLISTS */
+ MD_CHAR task_mark; /* If is_task, then one of 'x', 'X' or ' '. Undefined otherwise. */
+ MD_OFFSET task_mark_offset; /* If is_task, then offset in the input of the char between '[' and ']'. */
+}
+
+/* Detailed info for MD_BLOCK_H. */
+struct MD_BLOCK_H_DETAIL
+{
+ uint level; /* Header level (1 - 6) */
+}
+
+/* Detailed info for MD_BLOCK_CODE. */
+struct MD_BLOCK_CODE_DETAIL
+{
+ MD_ATTRIBUTE info;
+ MD_ATTRIBUTE lang;
+ MD_CHAR fence_char; /* The character used for fenced code block; or zero for indented code block. */
+}
+
+/* Detailed info for MD_BLOCK_TH and MD_BLOCK_TD. */
+struct MD_BLOCK_TD_DETAIL
+{
+ MD_ALIGN align_;
+}
+
+/* Detailed info for MD_SPAN_A. */
+struct MD_SPAN_A_DETAIL
+{
+ MD_ATTRIBUTE href;
+ MD_ATTRIBUTE title;
+}
+
+/* Detailed info for MD_SPAN_IMG. */
+struct MD_SPAN_IMG_DETAIL
+{
+ MD_ATTRIBUTE src;
+ MD_ATTRIBUTE title;
+}
+
+
+/* Flags specifying extensions/deviations from CommonMark specification.
+ *
+ * By default (when MD_RENDERER::flags == 0), we follow CommonMark specification.
+ * The following flags may allow some extensions or deviations from it.
+ */
+ enum
+ {
+ MD_FLAG_COLLAPSEWHITESPACE = 0x0001, /* In MD_TEXT_NORMAL, collapse non-trivial whitespace into single ' ' */
+ MD_FLAG_PERMISSIVEATXHEADERS = 0x0002, /* Do not require space in ATX headers ( ###header ) */
+ MD_FLAG_PERMISSIVEURLAUTOLINKS = 0x0004, /* Recognize URLs as autolinks even without '<', '>' */
+ MD_FLAG_PERMISSIVEEMAILAUTOLINKS = 0x0008, /* Recognize e-mails as autolinks even without '<', '>' and 'mailto:' */
+ MD_FLAG_NOINDENTEDCODEBLOCKS = 0x0010, /* Disable indented code blocks. (Only fenced code works.) */
+ MD_FLAG_NOHTMLBLOCKS = 0x0020, /* Disable raw HTML blocks. */
+ MD_FLAG_NOHTMLSPANS = 0x0040, /* Disable raw HTML (inline). */
+ MD_FLAG_TABLES = 0x0100, /* Enable tables extension. */
+ MD_FLAG_STRIKETHROUGH = 0x0200, /* Enable strikethrough extension. */
+ MD_FLAG_PERMISSIVEWWWAUTOLINKS = 0x0400, /* Enable WWW autolinks (even without any scheme prefix, if they begin with 'www.') */
+ MD_FLAG_TASKLISTS = 0x0800, /* Enable task list extension. */
+ MD_FLAG_LATEXMATHSPANS = 0x1000, /* Enable $ and $$ containing LaTeX equations. */
+
+ MD_FLAG_PERMISSIVEAUTOLINKS = MD_FLAG_PERMISSIVEEMAILAUTOLINKS | MD_FLAG_PERMISSIVEURLAUTOLINKS | MD_FLAG_PERMISSIVEWWWAUTOLINKS,
+ MD_FLAG_NOHTML = MD_FLAG_NOHTMLBLOCKS | MD_FLAG_NOHTMLSPANS,
+
+ /* Convenient sets of flags corresponding to well-known Markdown dialects.
+ *
+ * Note we may only support subset of features of the referred dialect.
+ * The constant just enables those extensions which bring us as close as
+ * possible given what features we implement.
+ *
+ * ABI compatibility note: Meaning of these can change in time as new
+ * extensions, bringing the dialect closer to the original, are implemented.
+ */
+ MD_DIALECT_COMMONMARK = 0,
+ MD_DIALECT_GITHUB = (MD_FLAG_PERMISSIVEAUTOLINKS | MD_FLAG_TABLES | MD_FLAG_STRIKETHROUGH | MD_FLAG_TASKLISTS),
+}
+
+/* Renderer structure.
+ */
+struct MD_PARSER
+{
+nothrow:
+@nogc:
+ /* Reserved. Set to zero.
+ */
+ uint abi_version;
+
+ /* Dialect options. Bitmask of MD_FLAG_xxxx values.
+ */
+ uint flags;
+
+ /* Caller-provided rendering callbacks.
+ *
+ * For some block/span types, more detailed information is provided in a
+ * type-specific structure pointed by the argument 'detail'.
+ *
+ * The last argument of all callbacks, 'userdata', is just propagated from
+ * md_parse() and is available for any use by the application.
+ *
+ * Note any strings provided to the callbacks as their arguments or as
+ * members of any detail structure are generally not zero-terminated.
+ * Application has take the respective size information into account.
+ *
+ * Callbacks may abort further parsing of the document by returning non-zero.
+ */
+ int function(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/) enter_block;
+ int function(MD_BLOCKTYPE /*type*/, void* /*detail*/, void* /*userdata*/) leave_block;
+
+ int function(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/) enter_span;
+ int function(MD_SPANTYPE /*type*/, void* /*detail*/, void* /*userdata*/) leave_span;
+
+ int function(MD_TEXTTYPE /*type*/, const(MD_CHAR)* /*text*/, MD_SIZE /*size*/, void* /*userdata*/) text;
+
+ /* Debug callback. Optional (may be null).
+ *
+ * If provided and something goes wrong, this function gets called.
+ * This is intended for debugging and problem diagnosis for developers;
+ * it is not intended to provide any errors suitable for displaying to an
+ * end user.
+ */
+ void function(const(char)* /*msg*/, void* /*userdata*/) debug_log;
+
+ /* Reserved. Set to null.
+ */
+ void function() syntax;
+}
+
+
+/*****************************
+ *** Miscellaneous Stuff ***
+ *****************************/
+
+
+/* Misc. macros. */
+
+enum TRUE = 1;
+enum FALSE = 0;
+
+
+/************************
+ *** Internal Types ***
+ ************************/
+
+/* These are omnipresent so lets save some typing. */
+alias CHAR = MD_CHAR;
+alias SZ = MD_SIZE;
+alias OFF = MD_OFFSET;
+
+/* During analyzes of inline marks, we need to manage some "mark chains",
+ * of (yet unresolved) openers. This structure holds start/end of the chain.
+ * The chain internals are then realized through MD_MARK::prev and ::next.
+ */
+struct MD_MARKCHAIN
+{
+ int head; /* Index of first mark in the chain, or -1 if empty. */
+ int tail; /* Index of last mark in the chain, or -1 if empty. */
+}
+
+enum OPENERS_CHAIN_FIRST = 2;
+enum OPENERS_CHAIN_LAST = 11;
+
+/* Context propagated through all the parsing. */
+struct MD_CTX
+{
+nothrow:
+@nogc:
+
+ /* Immutable stuff (parameters of md_parse()). */
+ const(CHAR)* text;
+ SZ size;
+ MD_PARSER parser;
+ void* userdata;
+
+ /* When this is true, it allows some optimizations. */
+ int doc_ends_with_newline;
+
+ /* Helper temporary growing buffer. */
+ CHAR* buffer;
+ uint alloc_buffer;
+
+ /* Reference definitions. */
+ MD_REF_DEF* ref_defs;
+ int n_ref_defs;
+ int alloc_ref_defs;
+ void** ref_def_hashtable;
+ int ref_def_hashtable_size;
+
+ /* Stack of inline/span markers.
+ * This is only used for parsing a single block contents but by storing it
+ * here we may reuse the stack for subsequent blocks; i.e. we have fewer
+ * (re)allocations. */
+ MD_MARK* marks;
+ int n_marks;
+ int alloc_marks;
+
+ ubyte[256] mark_char_map;
+ /* For resolving of inline spans. */
+ MD_MARKCHAIN[12] mark_chains;
+
+ MD_MARKCHAIN* PTR_CHAIN() return { return &mark_chains[0]; }
+ MD_MARKCHAIN* TABLECELLBOUNDARIES() return { return &mark_chains[1]; }
+ MD_MARKCHAIN* ASTERISK_OPENERS_extraword_mod3_0() return { return &mark_chains[2]; }
+ MD_MARKCHAIN* ASTERISK_OPENERS_extraword_mod3_1() return { return &mark_chains[3]; }
+ MD_MARKCHAIN* ASTERISK_OPENERS_extraword_mod3_2() return { return &mark_chains[4]; }
+ MD_MARKCHAIN* ASTERISK_OPENERS_intraword_mod3_0() return { return &mark_chains[5]; }
+ MD_MARKCHAIN* ASTERISK_OPENERS_intraword_mod3_1() return { return &mark_chains[6]; }
+ MD_MARKCHAIN* ASTERISK_OPENERS_intraword_mod3_2() return { return &mark_chains[7]; }
+ MD_MARKCHAIN* UNDERSCORE_OPENERS() return { return &mark_chains[8]; }
+ MD_MARKCHAIN* TILDE_OPENERS() return { return &mark_chains[9]; }
+ MD_MARKCHAIN* BRACKET_OPENERS() return { return &mark_chains[10]; }
+ MD_MARKCHAIN* DOLLAR_OPENERS() return { return &mark_chains[11]; }
+
+ int n_table_cell_boundaries;
+
+ /* For resolving links. */
+ int unresolved_link_head;
+ int unresolved_link_tail;
+
+ /* For resolving raw HTML. */
+ OFF html_comment_horizon;
+ OFF html_proc_instr_horizon;
+ OFF html_decl_horizon;
+ OFF html_cdata_horizon;
+
+ /* For block analysis.
+ * Notes:
+ * -- It holds MD_BLOCK as well as MD_LINE structures. After each
+ * MD_BLOCK, its (multiple) MD_LINE(s) follow.
+ * -- For MD_BLOCK_HTML and MD_BLOCK_CODE, MD_VERBATIMLINE(s) are used
+ * instead of MD_LINE(s).
+ */
+ void* block_bytes;
+ MD_BLOCK* current_block;
+ int n_block_bytes;
+ int alloc_block_bytes;
+
+ /* For container block analysis. */
+ MD_CONTAINER* containers;
+ int n_containers;
+ int alloc_containers;
+
+ /* Minimal indentation to call the block "indented code block". */
+ uint code_indent_offset;
+
+ /* Contextual info for line analysis. */
+ SZ code_fence_length; /* For checking closing fence length. */
+ int html_block_type; /* For checking closing raw HTML condition. */
+ int last_line_has_list_loosening_effect;
+ int last_list_item_starts_with_two_blank_lines;
+
+ void MD_LOG(const(char)* msg)
+ {
+ if(parser.debug_log != null)
+ parser.debug_log(msg, userdata);
+ }
+
+ /* Character accessors. */
+ CHAR CH(OFF off)
+ {
+ return text[off];
+ }
+
+ const(CHAR)* STR(OFF off)
+ {
+ return text + off;
+ }
+
+ bool ISANYOF(OFF off, const(CHAR)* palette) { return ISANYOF_(CH(off), palette); }
+ bool ISANYOF2(OFF off, CHAR ch1, CHAR ch2) { return ISANYOF2_(CH(off), ch1, ch2); }
+ bool ISANYOF3(OFF off, CHAR ch1, CHAR ch2, CHAR ch3) { return ISANYOF3_(CH(off), ch1, ch2, ch3); }
+ bool ISASCII(OFF off) { return ISASCII_(CH(off)); }
+ bool ISBLANK(OFF off) { return ISBLANK_(CH(off)); }
+ bool ISNEWLINE(OFF off) { return ISNEWLINE_(CH(off)); }
+ bool ISWHITESPACE(OFF off) { return ISWHITESPACE_(CH(off)); }
+ bool ISCNTRL(OFF off) { return ISCNTRL_(CH(off)); }
+ bool ISPUNCT(OFF off) { return ISPUNCT_(CH(off)); }
+ bool ISUPPER(OFF off) { return ISUPPER_(CH(off)); }
+ bool ISLOWER(OFF off) { return ISLOWER_(CH(off)); }
+ bool ISALPHA(OFF off) { return ISALPHA_(CH(off)); }
+ bool ISDIGIT(OFF off) { return ISDIGIT_(CH(off)); }
+ bool ISXDIGIT(OFF off) { return ISXDIGIT_(CH(off)); }
+ bool ISALNUM(OFF off) { return ISALNUM_(CH(off)); }
+}
+
+alias MD_LINETYPE = int;
+enum : MD_LINETYPE
+{
+ MD_LINE_BLANK,
+ MD_LINE_HR,
+ MD_LINE_ATXHEADER,
+ MD_LINE_SETEXTHEADER,
+ MD_LINE_SETEXTUNDERLINE,
+ MD_LINE_INDENTEDCODE,
+ MD_LINE_FENCEDCODE,
+ MD_LINE_HTML,
+ MD_LINE_TEXT,
+ MD_LINE_TABLE,
+ MD_LINE_TABLEUNDERLINE
+}
+
+struct MD_LINE_ANALYSIS
+{
+nothrow:
+@nogc:
+ short type_;
+ ushort data_;
+
+ MD_LINETYPE type() const
+ {
+ return type_;
+ }
+
+ void type(MD_LINETYPE value)
+ {
+ type_ = cast(short)value;
+ }
+
+ int data() const
+ {
+ return data_;
+ }
+
+ void data(uint value)
+ {
+ data_ = cast(ushort)value;
+ }
+
+ OFF beg;
+ OFF end;
+ uint indent; /* Indentation level. */
+}
+
+struct MD_LINE
+{
+ OFF beg;
+ OFF end;
+}
+
+struct MD_VERBATIMLINE
+{
+ OFF beg;
+ OFF end;
+ OFF indent;
+}
+
+
+/*****************
+ *** Helpers ***
+ *****************/
+
+pure
+{
+ /* Character classification.
+ * Note we assume ASCII compatibility of code points < 128 here. */
+ bool ISIN_(CHAR ch, CHAR ch_min, CHAR ch_max)
+ {
+ return (ch_min <= cast(uint)(ch) && cast(uint)(ch) <= ch_max);
+ }
+
+ bool ISANYOF_(CHAR ch, const(CHAR)* palette)
+ {
+ return md_strchr(palette, ch) != null;
+ }
+
+ bool ISANYOF2_(CHAR ch, CHAR ch1, CHAR ch2)
+ {
+ return (ch == ch1) || (ch == ch2);
+ }
+
+ bool ISANYOF3_(CHAR ch, CHAR ch1, CHAR ch2, CHAR ch3)
+ {
+ return (ch == ch1) || (ch == ch2) || (ch == ch3);
+ }
+
+ bool ISASCII_(CHAR ch)
+ {
+ return (cast(uint)ch) <= 127;
+ }
+
+ bool ISBLANK_(CHAR ch)
+ {
+ return ISANYOF2_(ch, ' ', '\t');
+ }
+
+ bool ISNEWLINE_(CHAR ch)
+ {
+ return ISANYOF2_(ch, '\r', '\n');
+ }
+
+ bool ISWHITESPACE_(CHAR ch)
+ {
+ return ISBLANK_(ch) || ISANYOF2_(ch, '\v', '\f');
+ }
+
+ bool ISCNTRL_(CHAR ch)
+ {
+ return (cast(uint)(ch) <= 31 || cast(uint)(ch) == 127);
+ }
+
+ bool ISPUNCT_(CHAR ch)
+ {
+ return ISIN_(ch, 33, 47) || ISIN_(ch, 58, 64) || ISIN_(ch, 91, 96) || ISIN_(ch, 123, 126);
+ }
+
+ bool ISUPPER_(CHAR ch)
+ {
+ return ISIN_(ch, 'A', 'Z');
+ }
+
+ bool ISLOWER_(CHAR ch)
+ {
+ return ISIN_(ch, 'a', 'z');
+ }
+
+ bool ISALPHA_(CHAR ch)
+ {
+ return ISUPPER_(ch) || ISLOWER_(ch);
+ }
+
+ bool ISDIGIT_(CHAR ch)
+ {
+ return ISIN_(ch, '0', '9');
+ }
+
+ bool ISXDIGIT_(CHAR ch)
+ {
+ return ISDIGIT_(ch) || ISIN_(ch, 'A', 'F') || ISIN_(ch, 'a', 'f');
+ }
+
+ bool ISALNUM_(CHAR ch)
+ {
+ return ISALPHA_(ch) || ISDIGIT_(ch);
+ }
+}
+
+const(CHAR)* md_strchr(const(CHAR)* str, CHAR ch) pure
+{
+ OFF i;
+ for(i = 0; str[i] != '\0'; i++) {
+ if(ch == str[i])
+ return (str + i);
+ }
+ return null;
+}
+
+/* Case insensitive check of string equality. */
+int md_ascii_case_eq(const(CHAR)* s1, const(CHAR)* s2, SZ n)
+{
+ OFF i;
+ for(i = 0; i < n; i++) {
+ CHAR ch1 = s1[i];
+ CHAR ch2 = s2[i];
+
+ if(ISLOWER_(ch1))
+ ch1 += ('A'-'a');
+ if(ISLOWER_(ch2))
+ ch2 += ('A'-'a');
+ if(ch1 != ch2)
+ return FALSE;
+ }
+ return TRUE;
+}
+
+int md_ascii_eq(const(CHAR)* s1, const(CHAR)* s2, SZ n)
+{
+ return memcmp(s1, s2, n * CHAR.sizeof) == 0;
+}
+
+int md_text_with_null_replacement(MD_CTX* ctx, MD_TEXTTYPE type, const(CHAR)* str, SZ size)
+{
+ OFF off = 0;
+ int ret = 0;
+
+ while(1) {
+ while(off < size && str[off] != '\0')
+ off++;
+
+ if(off > 0) {
+ ret = ctx.parser.text(type, str, off, ctx.userdata);
+ if(ret != 0)
+ return ret;
+
+ str += off;
+ size -= off;
+ off = 0;
+ }
+
+ if(off >= size)
+ return 0;
+
+ ret = ctx.parser.text(MD_TEXT_NULLCHAR, "", 1, ctx.userdata);
+ if(ret != 0)
+ return ret;
+ off++;
+ }
+}
+
+int MD_TEMP_BUFFER(MD_CTX* ctx, SZ sz)
+{
+ if(sz > ctx.alloc_buffer)
+ {
+ CHAR* new_buffer;
+ SZ new_size = ((sz) + (sz) / 2 + 128) & ~127;
+ new_buffer = cast(CHAR*) realloc_safe(ctx.buffer, new_size);
+ if (new_buffer == null)
+ {
+ ctx.MD_LOG("realloc() failed.");
+ return -1;
+ }
+ ctx.buffer = new_buffer;
+ ctx.alloc_buffer = new_size;
+ }
+ return 0;
+}
+
+int MD_ENTER_BLOCK(MD_CTX* ctx, MD_BLOCKTYPE type, void* arg)
+{
+ int ret = ctx.parser.enter_block(type, arg, ctx.userdata);
+ if(ret != 0)
+ {
+ ctx.MD_LOG("Aborted from enter_block() callback.");
+ return ret;
+ }
+ return 0;
+}
+
+int MD_LEAVE_BLOCK(MD_CTX* ctx, MD_BLOCKTYPE type, void* arg)
+{
+ int ret = ctx.parser.leave_block(type, arg, ctx.userdata);
+ if(ret != 0)
+ {
+ ctx.MD_LOG("Aborted from leave_block() callback.");
+ return ret;
+ }
+ return 0;
+}
+
+int MD_ENTER_SPAN(MD_CTX* ctx, MD_SPANTYPE type, void* arg)
+{
+ int ret = ctx.parser.enter_span(type, arg, ctx.userdata);
+ if(ret != 0)
+ {
+ ctx.MD_LOG("Aborted from enter_span() callback.");
+ return ret;
+ }
+ return 0;
+}
+
+int MD_LEAVE_SPAN(MD_CTX* ctx, MD_SPANTYPE type, void* arg)
+{
+ int ret = ctx.parser.leave_span(type, arg, ctx.userdata);
+ if(ret != 0)
+ {
+ ctx.MD_LOG("Aborted from leave_span() callback.");
+ return ret;
+ }
+ return 0;
+}
+
+int MD_TEXT(MD_CTX* ctx, MD_TEXTTYPE type, const(MD_CHAR)* str, MD_SIZE size)
+{
+ if(size > 0)
+ {
+ int ret = ctx.parser.text((type), (str), (size), ctx.userdata);
+ if (ret != 0)
+ {
+ ctx.MD_LOG("Aborted from text() callback.");
+ return ret;
+ }
+ }
+ return 0;
+}
+
+int MD_TEXT_INSECURE(MD_CTX* ctx, MD_TEXTTYPE type, const(MD_CHAR)* str, MD_SIZE size)
+{
+ if(size > 0)
+ {
+ int ret = md_text_with_null_replacement(ctx, type, str, size);
+ if(ret != 0)
+ {
+ ctx.MD_LOG("Aborted from text() callback.");
+ return ret;
+ }
+ }
+ return 0;
+}
+
+/*************************
+ *** Unicode Support ***
+ *************************/
+
+struct MD_UNICODE_FOLD_INFO
+{
+ uint[3] codepoints;
+ int n_codepoints;
+};
+
+
+
+/* Binary search over sorted "map" of codepoints. Consecutive sequences
+ * of codepoints may be encoded in the map by just using the
+ * (MIN_CODEPOINT | 0x40000000) and (MAX_CODEPOINT | 0x80000000).
+ *
+ * Returns index of the found record in the map (in the case of ranges,
+ * the minimal value is used); or -1 on failure. */
+int md_unicode_bsearch__(uint codepoint, const(uint)* map, size_t map_size)
+{
+ int beg, end;
+ int pivot_beg, pivot_end;
+
+ beg = 0;
+ end = cast(int) map_size-1;
+ while(beg <= end) {
+ /* Pivot may be a range, not just a single value. */
+ pivot_beg = pivot_end = (beg + end) / 2;
+ if(map[pivot_end] & 0x40000000)
+ pivot_end++;
+ if(map[pivot_beg] & 0x80000000)
+ pivot_beg--;
+
+ if(codepoint < (map[pivot_beg] & 0x00ffffff))
+ end = pivot_beg - 1;
+ else if(codepoint > (map[pivot_end] & 0x00ffffff))
+ beg = pivot_end + 1;
+ else
+ return pivot_beg;
+ }
+
+ return -1;
+}
+
+bool md_is_unicode_whitespace__(uint codepoint)
+{
+ /* Unicode "Zs" category.
+ * (generated by scripts/build_whitespace_map.py) */
+ static immutable uint[] WHITESPACE_MAP =
+ [
+ 0x0020, 0x00a0, 0x1680, 0x2000| 0x40000000, 0x200a | 0x80000000, 0x202f, 0x205f, 0x3000
+ ];
+
+ /* The ASCII ones are the most frequently used ones, also CommonMark
+ * specification requests few more in this range. */
+ if(codepoint <= 0x7f)
+ return ISWHITESPACE_(cast(CHAR)codepoint);
+
+ return (md_unicode_bsearch__(codepoint, WHITESPACE_MAP.ptr, WHITESPACE_MAP.length) >= 0);
+}
+
+bool md_is_unicode_punct__(uint codepoint)
+{
+ /* Unicode "Pc", "Pd", "Pe", "Pf", "Pi", "Po", "Ps" categories.
+ * (generated by scripts/build_punct_map.py) */
+ static immutable uint[] PUNCT_MAP =
+ [
+ 0x0021 | 0x40000000,0x0023 | 0x80000000, 0x0025 | 0x40000000,0x002a | 0x80000000, 0x002c | 0x40000000,0x002f | 0x80000000, 0x003a | 0x40000000,0x003b | 0x80000000, 0x003f | 0x40000000,0x0040 | 0x80000000,
+ 0x005b | 0x40000000,0x005d | 0x80000000, 0x005f, 0x007b, 0x007d, 0x00a1, 0x00a7, 0x00ab, 0x00b6 | 0x40000000,0x00b7 | 0x80000000,
+ 0x00bb, 0x00bf, 0x037e, 0x0387, 0x055a | 0x40000000,0x055f | 0x80000000, 0x0589 | 0x40000000,0x058a | 0x80000000, 0x05be, 0x05c0,
+ 0x05c3, 0x05c6, 0x05f3 | 0x40000000,0x05f4 | 0x80000000, 0x0609 | 0x40000000,0x060a | 0x80000000, 0x060c | 0x40000000,0x060d | 0x80000000, 0x061b, 0x061e | 0x40000000,0x061f | 0x80000000,
+ 0x066a | 0x40000000,0x066d | 0x80000000, 0x06d4, 0x0700 | 0x40000000,0x070d | 0x80000000, 0x07f7 | 0x40000000,0x07f9 | 0x80000000, 0x0830 | 0x40000000,0x083e | 0x80000000, 0x085e,
+ 0x0964 | 0x40000000,0x0965 | 0x80000000, 0x0970, 0x09fd, 0x0a76, 0x0af0, 0x0c77, 0x0c84, 0x0df4, 0x0e4f,
+ 0x0e5a | 0x40000000,0x0e5b | 0x80000000, 0x0f04 | 0x40000000,0x0f12 | 0x80000000, 0x0f14, 0x0f3a | 0x40000000,0x0f3d | 0x80000000, 0x0f85, 0x0fd0 | 0x40000000,0x0fd4 | 0x80000000,
+ 0x0fd9 | 0x40000000,0x0fda | 0x80000000, 0x104a | 0x40000000,0x104f | 0x80000000, 0x10fb, 0x1360 | 0x40000000,0x1368 | 0x80000000, 0x1400, 0x166e, 0x169b | 0x40000000,0x169c | 0x80000000,
+ 0x16eb | 0x40000000,0x16ed | 0x80000000, 0x1735 | 0x40000000,0x1736 | 0x80000000, 0x17d4 | 0x40000000,0x17d6 | 0x80000000, 0x17d8 | 0x40000000,0x17da | 0x80000000, 0x1800 | 0x40000000,0x180a | 0x80000000,
+ 0x1944 | 0x40000000,0x1945 | 0x80000000, 0x1a1e | 0x40000000,0x1a1f | 0x80000000, 0x1aa0 | 0x40000000,0x1aa6 | 0x80000000, 0x1aa8 | 0x40000000,0x1aad | 0x80000000, 0x1b5a | 0x40000000,0x1b60 | 0x80000000,
+ 0x1bfc | 0x40000000,0x1bff | 0x80000000, 0x1c3b | 0x40000000,0x1c3f | 0x80000000, 0x1c7e | 0x40000000,0x1c7f | 0x80000000, 0x1cc0 | 0x40000000,0x1cc7 | 0x80000000, 0x1cd3, 0x2010 | 0x40000000,0x2027 | 0x80000000,
+ 0x2030 | 0x40000000,0x2043 | 0x80000000, 0x2045 | 0x40000000,0x2051 | 0x80000000, 0x2053 | 0x40000000,0x205e | 0x80000000, 0x207d | 0x40000000,0x207e | 0x80000000, 0x208d | 0x40000000,0x208e | 0x80000000,
+ 0x2308 | 0x40000000,0x230b | 0x80000000, 0x2329 | 0x40000000,0x232a | 0x80000000, 0x2768 | 0x40000000,0x2775 | 0x80000000, 0x27c5 | 0x40000000,0x27c6 | 0x80000000, 0x27e6 | 0x40000000,0x27ef | 0x80000000,
+ 0x2983 | 0x40000000,0x2998 | 0x80000000, 0x29d8 | 0x40000000,0x29db | 0x80000000, 0x29fc | 0x40000000,0x29fd | 0x80000000, 0x2cf9 | 0x40000000,0x2cfc | 0x80000000, 0x2cfe | 0x40000000,0x2cff | 0x80000000, 0x2d70,
+ 0x2e00 | 0x40000000,0x2e2e | 0x80000000, 0x2e30 | 0x40000000,0x2e4f | 0x80000000, 0x3001 | 0x40000000,0x3003 | 0x80000000, 0x3008 | 0x40000000,0x3011 | 0x80000000, 0x3014 | 0x40000000,0x301f | 0x80000000, 0x3030,
+ 0x303d, 0x30a0, 0x30fb, 0xa4fe | 0x40000000,0xa4ff | 0x80000000, 0xa60d | 0x40000000,0xa60f | 0x80000000, 0xa673, 0xa67e,
+ 0xa6f2 | 0x40000000,0xa6f7 | 0x80000000, 0xa874 | 0x40000000,0xa877 | 0x80000000, 0xa8ce | 0x40000000,0xa8cf | 0x80000000, 0xa8f8 | 0x40000000,0xa8fa | 0x80000000, 0xa8fc, 0xa92e | 0x40000000,0xa92f | 0x80000000,
+ 0xa95f, 0xa9c1 | 0x40000000,0xa9cd | 0x80000000, 0xa9de | 0x40000000,0xa9df | 0x80000000, 0xaa5c | 0x40000000,0xaa5f | 0x80000000, 0xaade | 0x40000000,0xaadf | 0x80000000, 0xaaf0 | 0x40000000,0xaaf1 | 0x80000000,
+ 0xabeb, 0xfd3e | 0x40000000,0xfd3f | 0x80000000, 0xfe10 | 0x40000000,0xfe19 | 0x80000000, 0xfe30 | 0x40000000,0xfe52 | 0x80000000, 0xfe54 | 0x40000000,0xfe61 | 0x80000000, 0xfe63, 0xfe68,
+ 0xfe6a | 0x40000000,0xfe6b | 0x80000000, 0xff01 | 0x40000000,0xff03 | 0x80000000, 0xff05 | 0x40000000,0xff0a | 0x80000000, 0xff0c | 0x40000000,0xff0f | 0x80000000, 0xff1a | 0x40000000,0xff1b | 0x80000000,
+ 0xff1f | 0x40000000,0xff20 | 0x80000000, 0xff3b | 0x40000000,0xff3d | 0x80000000, 0xff3f, 0xff5b, 0xff5d, 0xff5f | 0x40000000,0xff65 | 0x80000000, 0x10100 | 0x40000000,0x10102 | 0x80000000,
+ 0x1039f, 0x103d0, 0x1056f, 0x10857, 0x1091f, 0x1093f, 0x10a50 | 0x40000000,0x10a58 | 0x80000000, 0x10a7f,
+ 0x10af0 | 0x40000000,0x10af6 | 0x80000000, 0x10b39 | 0x40000000,0x10b3f | 0x80000000, 0x10b99 | 0x40000000,0x10b9c | 0x80000000, 0x10f55 | 0x40000000,0x10f59 | 0x80000000, 0x11047 | 0x40000000,0x1104d | 0x80000000,
+ 0x110bb | 0x40000000,0x110bc | 0x80000000, 0x110be | 0x40000000,0x110c1 | 0x80000000, 0x11140 | 0x40000000,0x11143 | 0x80000000, 0x11174 | 0x40000000,0x11175 | 0x80000000, 0x111c5 | 0x40000000,0x111c8 | 0x80000000,
+ 0x111cd, 0x111db, 0x111dd | 0x40000000,0x111df | 0x80000000, 0x11238 | 0x40000000,0x1123d | 0x80000000, 0x112a9, 0x1144b | 0x40000000,0x1144f | 0x80000000,
+ 0x1145b, 0x1145d, 0x114c6, 0x115c1 | 0x40000000,0x115d7 | 0x80000000, 0x11641 | 0x40000000,0x11643 | 0x80000000, 0x11660 | 0x40000000,0x1166c | 0x80000000,
+ 0x1173c | 0x40000000,0x1173e | 0x80000000, 0x1183b, 0x119e2, 0x11a3f | 0x40000000,0x11a46 | 0x80000000, 0x11a9a | 0x40000000,0x11a9c | 0x80000000, 0x11a9e | 0x40000000,0x11aa2 | 0x80000000,
+ 0x11c41 | 0x40000000,0x11c45 | 0x80000000, 0x11c70 | 0x40000000,0x11c71 | 0x80000000, 0x11ef7 | 0x40000000,0x11ef8 | 0x80000000, 0x11fff, 0x12470 | 0x40000000,0x12474 | 0x80000000,
+ 0x16a6e | 0x40000000,0x16a6f | 0x80000000, 0x16af5, 0x16b37 | 0x40000000,0x16b3b | 0x80000000, 0x16b44, 0x16e97 | 0x40000000,0x16e9a | 0x80000000, 0x16fe2,
+ 0x1bc9f, 0x1da87 | 0x40000000,0x1da8b | 0x80000000, 0x1e95e | 0x40000000,0x1e95f | 0x80000000
+ ];
+
+ /* The ASCII ones are the most frequently used ones, also CommonMark
+ * specification requests few more in this range. */
+ if(codepoint <= 0x7f)
+ return ISPUNCT_(cast(CHAR)codepoint);
+
+ return (md_unicode_bsearch__(codepoint, PUNCT_MAP.ptr, PUNCT_MAP.length) >= 0);
+}
+
+void md_get_unicode_fold_info(uint codepoint, MD_UNICODE_FOLD_INFO* info)
+{
+ /* Unicode "Pc", "Pd", "Pe", "Pf", "Pi", "Po", "Ps" categories.
+ * (generated by scripts/build_punct_map.py) */
+ static immutable uint[] FOLD_MAP_1 =
+ [
+ 0x0041 | 0x40000000, 0x005a | 0x80000000, 0x00b5, 0x00c0 | 0x40000000, 0x00d6 | 0x80000000, 0x00d8 | 0x40000000, 0x00de | 0x80000000, 0x0100 | 0x40000000, 0x012e | 0x80000000, 0x0132 | 0x40000000, 0x0136 | 0x80000000,
+ 0x0139 | 0x40000000, 0x0147 | 0x80000000, 0x014a | 0x40000000, 0x0176 | 0x80000000, 0x0178, 0x0179 | 0x40000000, 0x017d | 0x80000000, 0x017f, 0x0181, 0x0182,
+ 0x0186, 0x0187, 0x0189, 0x018b, 0x018e, 0x018f, 0x0190, 0x0191, 0x0193,
+ 0x0194, 0x0196, 0x0197, 0x0198, 0x019c, 0x019d, 0x019f, 0x01a0 | 0x40000000, 0x01a4 | 0x80000000, 0x01a6,
+ 0x01a7, 0x01a9, 0x01ac, 0x01ae, 0x01af, 0x01b1, 0x01b3, 0x01b7, 0x01b8,
+ 0x01bc, 0x01c4, 0x01c5, 0x01c7, 0x01c8, 0x01ca, 0x01cb | 0x40000000, 0x01db | 0x80000000, 0x01de | 0x40000000, 0x01ee | 0x80000000,
+ 0x01f1, 0x01f2, 0x01f6, 0x01f7, 0x01f8 | 0x40000000, 0x021e | 0x80000000, 0x0220, 0x0222 | 0x40000000, 0x0232 | 0x80000000, 0x023a,
+ 0x023b, 0x023d, 0x023e, 0x0241, 0x0243, 0x0244, 0x0245, 0x0246 | 0x40000000, 0x024e | 0x80000000, 0x0345,
+ 0x0370, 0x0376, 0x037f, 0x0386, 0x0388 | 0x40000000, 0x038a | 0x80000000, 0x038c, 0x038e, 0x0391 | 0x40000000, 0x03a1 | 0x80000000,
+ 0x03a3 | 0x40000000, 0x03ab | 0x80000000, 0x03c2, 0x03cf, 0x03d0, 0x03d1, 0x03d5, 0x03d6, 0x03d8 | 0x40000000, 0x03ee | 0x80000000,
+ 0x03f0, 0x03f1, 0x03f4, 0x03f5, 0x03f7, 0x03f9, 0x03fa, 0x03fd | 0x40000000, 0x03ff | 0x80000000,
+ 0x0400 | 0x40000000, 0x040f | 0x80000000, 0x0410 | 0x40000000, 0x042f | 0x80000000, 0x0460 | 0x40000000, 0x0480 | 0x80000000, 0x048a | 0x40000000, 0x04be | 0x80000000, 0x04c0, 0x04c1 | 0x40000000, 0x04cd | 0x80000000,
+ 0x04d0 | 0x40000000, 0x052e | 0x80000000, 0x0531 | 0x40000000, 0x0556 | 0x80000000, 0x10a0 | 0x40000000, 0x10c5 | 0x80000000, 0x10c7, 0x10cd, 0x13f8 | 0x40000000, 0x13fd | 0x80000000, 0x1c80,
+ 0x1c81, 0x1c82, 0x1c83, 0x1c85, 0x1c86, 0x1c87, 0x1c88, 0x1c90 | 0x40000000, 0x1cba | 0x80000000,
+ 0x1cbd | 0x40000000, 0x1cbf | 0x80000000, 0x1e00 | 0x40000000, 0x1e94 | 0x80000000, 0x1e9b, 0x1ea0 | 0x40000000, 0x1efe | 0x80000000, 0x1f08 | 0x40000000, 0x1f0f | 0x80000000, 0x1f18 | 0x40000000, 0x1f1d | 0x80000000,
+ 0x1f28 | 0x40000000, 0x1f2f | 0x80000000, 0x1f38 | 0x40000000, 0x1f3f | 0x80000000, 0x1f48 | 0x40000000, 0x1f4d | 0x80000000, 0x1f59, 0x1f5b, 0x1f5d, 0x1f5f,
+ 0x1f68 | 0x40000000, 0x1f6f | 0x80000000, 0x1fb8, 0x1fba, 0x1fbe, 0x1fc8 | 0x40000000, 0x1fcb | 0x80000000, 0x1fd8, 0x1fda, 0x1fe8,
+ 0x1fea, 0x1fec, 0x1ff8, 0x1ffa, 0x2126, 0x212a, 0x212b, 0x2132, 0x2160 | 0x40000000, 0x216f | 0x80000000,
+ 0x2183, 0x24b6 | 0x40000000, 0x24cf | 0x80000000, 0x2c00 | 0x40000000, 0x2c2e | 0x80000000, 0x2c60, 0x2c62, 0x2c63, 0x2c64,
+ 0x2c67 | 0x40000000, 0x2c6b | 0x80000000, 0x2c6d, 0x2c6e, 0x2c6f, 0x2c70, 0x2c72, 0x2c75, 0x2c7e,
+ 0x2c80 | 0x40000000, 0x2ce2 | 0x80000000, 0x2ceb, 0x2cf2, 0xa640 | 0x40000000, 0xa66c | 0x80000000, 0xa680 | 0x40000000, 0xa69a | 0x80000000, 0xa722 | 0x40000000, 0xa72e | 0x80000000,
+ 0xa732 | 0x40000000, 0xa76e | 0x80000000, 0xa779, 0xa77d, 0xa77e | 0x40000000, 0xa786 | 0x80000000, 0xa78b, 0xa78d, 0xa790,
+ 0xa796 | 0x40000000, 0xa7a8 | 0x80000000, 0xa7aa, 0xa7ab, 0xa7ac, 0xa7ad, 0xa7ae, 0xa7b0, 0xa7b1, 0xa7b2,
+ 0xa7b3, 0xa7b4 | 0x40000000, 0xa7be | 0x80000000, 0xa7c2, 0xa7c4, 0xa7c5, 0xa7c6, 0xab70 | 0x40000000, 0xabbf | 0x80000000,
+ 0xff21 | 0x40000000, 0xff3a | 0x80000000, 0x10400 | 0x40000000, 0x10427 | 0x80000000, 0x104b0 | 0x40000000, 0x104d3 | 0x80000000, 0x10c80 | 0x40000000, 0x10cb2 | 0x80000000, 0x118a0 | 0x40000000, 0x118bf | 0x80000000,
+ 0x16e40 | 0x40000000, 0x16e5f | 0x80000000, 0x1e900 | 0x40000000, 0x1e921 | 0x80000000
+ ];
+
+ static immutable uint[] FOLD_MAP_1_DATA =
+ [
+ 0x0061, 0x007a, 0x03bc, 0x00e0, 0x00f6, 0x00f8, 0x00fe, 0x0101, 0x012f, 0x0133, 0x0137, 0x013a, 0x0148,
+ 0x014b, 0x0177, 0x00ff, 0x017a, 0x017e, 0x0073, 0x0253, 0x0183, 0x0254, 0x0188, 0x0256, 0x018c, 0x01dd,
+ 0x0259, 0x025b, 0x0192, 0x0260, 0x0263, 0x0269, 0x0268, 0x0199, 0x026f, 0x0272, 0x0275, 0x01a1, 0x01a5,
+ 0x0280, 0x01a8, 0x0283, 0x01ad, 0x0288, 0x01b0, 0x028a, 0x01b4, 0x0292, 0x01b9, 0x01bd, 0x01c6, 0x01c6,
+ 0x01c9, 0x01c9, 0x01cc, 0x01cc, 0x01dc, 0x01df, 0x01ef, 0x01f3, 0x01f3, 0x0195, 0x01bf, 0x01f9, 0x021f,
+ 0x019e, 0x0223, 0x0233, 0x2c65, 0x023c, 0x019a, 0x2c66, 0x0242, 0x0180, 0x0289, 0x028c, 0x0247, 0x024f,
+ 0x03b9, 0x0371, 0x0377, 0x03f3, 0x03ac, 0x03ad, 0x03af, 0x03cc, 0x03cd, 0x03b1, 0x03c1, 0x03c3, 0x03cb,
+ 0x03c3, 0x03d7, 0x03b2, 0x03b8, 0x03c6, 0x03c0, 0x03d9, 0x03ef, 0x03ba, 0x03c1, 0x03b8, 0x03b5, 0x03f8,
+ 0x03f2, 0x03fb, 0x037b, 0x037d, 0x0450, 0x045f, 0x0430, 0x044f, 0x0461, 0x0481, 0x048b, 0x04bf, 0x04cf,
+ 0x04c2, 0x04ce, 0x04d1, 0x052f, 0x0561, 0x0586, 0x2d00, 0x2d25, 0x2d27, 0x2d2d, 0x13f0, 0x13f5, 0x0432,
+ 0x0434, 0x043e, 0x0441, 0x0442, 0x044a, 0x0463, 0xa64b, 0x10d0, 0x10fa, 0x10fd, 0x10ff, 0x1e01, 0x1e95,
+ 0x1e61, 0x1ea1, 0x1eff, 0x1f00, 0x1f07, 0x1f10, 0x1f15, 0x1f20, 0x1f27, 0x1f30, 0x1f37, 0x1f40, 0x1f45,
+ 0x1f51, 0x1f53, 0x1f55, 0x1f57, 0x1f60, 0x1f67, 0x1fb0, 0x1f70, 0x03b9, 0x1f72, 0x1f75, 0x1fd0, 0x1f76,
+ 0x1fe0, 0x1f7a, 0x1fe5, 0x1f78, 0x1f7c, 0x03c9, 0x006b, 0x00e5, 0x214e, 0x2170, 0x217f, 0x2184, 0x24d0,
+ 0x24e9, 0x2c30, 0x2c5e, 0x2c61, 0x026b, 0x1d7d, 0x027d, 0x2c68, 0x2c6c, 0x0251, 0x0271, 0x0250, 0x0252,
+ 0x2c73, 0x2c76, 0x023f, 0x2c81, 0x2ce3, 0x2cec, 0x2cf3, 0xa641, 0xa66d, 0xa681, 0xa69b, 0xa723, 0xa72f,
+ 0xa733, 0xa76f, 0xa77a, 0x1d79, 0xa77f, 0xa787, 0xa78c, 0x0265, 0xa791, 0xa797, 0xa7a9, 0x0266, 0x025c,
+ 0x0261, 0x026c, 0x026a, 0x029e, 0x0287, 0x029d, 0xab53, 0xa7b5, 0xa7bf, 0xa7c3, 0xa794, 0x0282, 0x1d8e,
+ 0x13a0, 0x13ef, 0xff41, 0xff5a, 0x10428, 0x1044f, 0x104d8, 0x104fb, 0x10cc0, 0x10cf2, 0x118c0, 0x118df,
+ 0x16e60, 0x16e7f, 0x1e922, 0x1e943
+ ];
+
+ static immutable uint[] FOLD_MAP_2 =
+ [
+ 0x00df, 0x0130, 0x0149, 0x01f0, 0x0587, 0x1e96, 0x1e97, 0x1e98, 0x1e99,
+ 0x1e9a, 0x1e9e, 0x1f50, 0x1f80 | 0x40000000, 0x1f87 | 0x80000000, 0x1f88 | 0x40000000, 0x1f8f | 0x80000000, 0x1f90 | 0x40000000, 0x1f97 | 0x80000000, 0x1f98 | 0x40000000, 0x1f9f | 0x80000000,
+ 0x1fa0 | 0x40000000, 0x1fa7 | 0x80000000, 0x1fa8 | 0x40000000, 0x1faf | 0x80000000, 0x1fb2, 0x1fb3, 0x1fb4, 0x1fb6, 0x1fbc, 0x1fc2,
+ 0x1fc3, 0x1fc4, 0x1fc6, 0x1fcc, 0x1fd6, 0x1fe4, 0x1fe6, 0x1ff2, 0x1ff3,
+ 0x1ff4, 0x1ff6, 0x1ffc, 0xfb00, 0xfb01, 0xfb02, 0xfb05, 0xfb06, 0xfb13,
+ 0xfb14, 0xfb15, 0xfb16, 0xfb17
+ ];
+
+ static immutable uint[] FOLD_MAP_2_DATA =
+ [
+ 0x0073,0x0073, 0x0069,0x0307, 0x02bc,0x006e, 0x006a,0x030c, 0x0565,0x0582, 0x0068,0x0331, 0x0074,0x0308,
+ 0x0077,0x030a, 0x0079,0x030a, 0x0061,0x02be, 0x0073,0x0073, 0x03c5,0x0313, 0x1f00,0x03b9, 0x1f07,0x03b9,
+ 0x1f00,0x03b9, 0x1f07,0x03b9, 0x1f20,0x03b9, 0x1f27,0x03b9, 0x1f20,0x03b9, 0x1f27,0x03b9, 0x1f60,0x03b9,
+ 0x1f67,0x03b9, 0x1f60,0x03b9, 0x1f67,0x03b9, 0x1f70,0x03b9, 0x03b1,0x03b9, 0x03ac,0x03b9, 0x03b1,0x0342,
+ 0x03b1,0x03b9, 0x1f74,0x03b9, 0x03b7,0x03b9, 0x03ae,0x03b9, 0x03b7,0x0342, 0x03b7,0x03b9, 0x03b9,0x0342,
+ 0x03c1,0x0313, 0x03c5,0x0342, 0x1f7c,0x03b9, 0x03c9,0x03b9, 0x03ce,0x03b9, 0x03c9,0x0342, 0x03c9,0x03b9,
+ 0x0066,0x0066, 0x0066,0x0069, 0x0066,0x006c, 0x0073,0x0074, 0x0073,0x0074, 0x0574,0x0576, 0x0574,0x0565,
+ 0x0574,0x056b, 0x057e,0x0576, 0x0574,0x056d
+ ];
+
+ static immutable uint[] FOLD_MAP_3 =
+ [
+ 0x0390, 0x03b0, 0x1f52, 0x1f54, 0x1f56, 0x1fb7, 0x1fc7, 0x1fd2, 0x1fd3,
+ 0x1fd7, 0x1fe2, 0x1fe3, 0x1fe7, 0x1ff7, 0xfb03, 0xfb04
+ ];
+
+ static immutable uint[] FOLD_MAP_3_DATA =
+ [
+ 0x03b9,0x0308,0x0301, 0x03c5,0x0308,0x0301, 0x03c5,0x0313,0x0300, 0x03c5,0x0313,0x0301,
+ 0x03c5,0x0313,0x0342, 0x03b1,0x0342,0x03b9, 0x03b7,0x0342,0x03b9, 0x03b9,0x0308,0x0300,
+ 0x03b9,0x0308,0x0301, 0x03b9,0x0308,0x0342, 0x03c5,0x0308,0x0300, 0x03c5,0x0308,0x0301,
+ 0x03c5,0x0308,0x0342, 0x03c9,0x0342,0x03b9, 0x0066,0x0066,0x0069, 0x0066,0x0066,0x006c
+ ];
+
+ static struct FOLD_MAP
+ {
+ const(uint)* map;
+ const(uint)* data;
+ size_t map_size;
+ int n_codepoints;
+ }
+
+ /*static immutable*/ FOLD_MAP[3] FOLD_MAP_LIST =
+ [
+ FOLD_MAP(FOLD_MAP_1.ptr, FOLD_MAP_1_DATA.ptr, FOLD_MAP_1.length, 1),
+ FOLD_MAP(FOLD_MAP_2.ptr, FOLD_MAP_2_DATA.ptr, FOLD_MAP_2.length, 2),
+ FOLD_MAP(FOLD_MAP_3.ptr, FOLD_MAP_3_DATA.ptr, FOLD_MAP_3.length, 3),
+ ];
+
+ int i;
+
+ /* Fast path for ASCII characters. */
+ if(codepoint <= 0x7f) {
+ info.codepoints[0] = codepoint;
+ if(ISUPPER_(cast(CHAR)codepoint))
+ info.codepoints[0] += 'a' - 'A';
+ info.n_codepoints = 1;
+ return;
+ }
+
+ /* Try to locate the codepoint in any of the maps. */
+ for(i = 0; i < cast(int) (FOLD_MAP_LIST.length); i++) {
+ int index;
+
+ index = md_unicode_bsearch__(codepoint, FOLD_MAP_LIST[i].map, FOLD_MAP_LIST[i].map_size);
+ if(index >= 0) {
+ /* Found the mapping. */
+ int n_codepoints = FOLD_MAP_LIST[i].n_codepoints;
+ const uint* map = FOLD_MAP_LIST[i].map;
+ const uint* codepoints = FOLD_MAP_LIST[i].data + (index * n_codepoints);
+
+ memcpy(info.codepoints.ptr, codepoints, uint.sizeof * n_codepoints);
+ info.n_codepoints = n_codepoints;
+
+ if(FOLD_MAP_LIST[i].map[index] != codepoint) {
+ /* The found mapping maps whole range of codepoints,
+ * i.e. we have to offset info.codepoints[0] accordingly. */
+ if((map[index] & 0x00ffffff)+1 == codepoints[0]) {
+ /* Alternating type of the range. */
+ info.codepoints[0] = codepoint + ((codepoint & 0x1) == (map[index] & 0x1) ? 1 : 0);
+ } else {
+ /* Range to range kind of mapping. */
+ info.codepoints[0] += (codepoint - (map[index] & 0x00ffffff));
+ }
+ }
+
+ return;
+ }
+ }
+
+ /* No mapping found. Map the codepoint to itself. */
+ info.codepoints[0] = codepoint;
+ info.n_codepoints = 1;
+}
+
+
+bool IS_UTF8_LEAD1(CHAR ch)
+{
+ return cast(ubyte)(ch) <= 0x7f;
+}
+
+bool IS_UTF8_LEAD2(CHAR ch)
+{
+ return (cast(ubyte)(ch) & 0xe0) == 0xc0;
+}
+
+bool IS_UTF8_LEAD3(CHAR ch)
+{
+ return (cast(ubyte)(ch) & 0xf0) == 0xe0;
+}
+
+bool IS_UTF8_LEAD4(CHAR ch)
+{
+ return (cast(ubyte)(ch) & 0xf8) == 0xf0;
+}
+
+bool IS_UTF8_TAIL(CHAR ch)
+{
+ return (cast(ubyte)(ch) & 0xc0) == 0x80;
+}
+
+uint md_decode_utf8__(const(CHAR)* str, SZ str_size, SZ* p_size)
+{
+ if(!IS_UTF8_LEAD1(str[0])) {
+ if(IS_UTF8_LEAD2(str[0])) {
+ if(1 < str_size && IS_UTF8_TAIL(str[1])) {
+ if(p_size != null)
+ *p_size = 2;
+
+ return ((cast(uint)str[0] & 0x1f) << 6) |
+ ((cast(uint)str[1] & 0x3f) << 0);
+ }
+ } else if(IS_UTF8_LEAD3(str[0])) {
+ if(2 < str_size && IS_UTF8_TAIL(str[1]) && IS_UTF8_TAIL(str[2])) {
+ if(p_size != null)
+ *p_size = 3;
+
+ return ((cast(uint)str[0] & 0x0f) << 12) |
+ ((cast(uint)str[1] & 0x3f) << 6) |
+ ((cast(uint)str[2] & 0x3f) << 0);
+ }
+ } else if(IS_UTF8_LEAD4(str[0])) {
+ if(3 < str_size && IS_UTF8_TAIL(str[1]) && IS_UTF8_TAIL(str[2]) && IS_UTF8_TAIL(str[3])) {
+ if(p_size != null)
+ *p_size = 4;
+
+ return ((cast(uint)str[0] & 0x07) << 18) |
+ ((cast(uint)str[1] & 0x3f) << 12) |
+ ((cast(uint)str[2] & 0x3f) << 6) |
+ ((cast(uint)str[3] & 0x3f) << 0);
+ }
+ }
+ }
+
+ if(p_size != null)
+ *p_size = 1;
+ return cast(uint) str[0];
+}
+
+uint md_decode_utf8_before__(MD_CTX* ctx, OFF off)
+{
+ if(!IS_UTF8_LEAD1(ctx.CH(off-1))) {
+ if(off > 1 && IS_UTF8_LEAD2(ctx.CH(off-2)) && IS_UTF8_TAIL(ctx.CH(off-1)))
+ return ((cast(uint)ctx.CH(off-2) & 0x1f) << 6) |
+ ((cast(uint)ctx.CH(off-1) & 0x3f) << 0);
+
+ if(off > 2 && IS_UTF8_LEAD3(ctx.CH(off-3)) && IS_UTF8_TAIL(ctx.CH(off-2)) && IS_UTF8_TAIL(ctx.CH(off-1)))
+ return ((cast(uint)ctx.CH(off-3) & 0x0f) << 12) |
+ ((cast(uint)ctx.CH(off-2) & 0x3f) << 6) |
+ ((cast(uint)ctx.CH(off-1) & 0x3f) << 0);
+
+ if(off > 3 && IS_UTF8_LEAD4(ctx.CH(off-4)) && IS_UTF8_TAIL(ctx.CH(off-3)) && IS_UTF8_TAIL(ctx.CH(off-2)) && IS_UTF8_TAIL(ctx.CH(off-1)))
+ return ((cast(uint)ctx.CH(off-4) & 0x07) << 18) |
+ ((cast(uint)ctx.CH(off-3) & 0x3f) << 12) |
+ ((cast(uint)ctx.CH(off-2) & 0x3f) << 6) |
+ ((cast(uint)ctx.CH(off-1) & 0x3f) << 0);
+ }
+
+ return cast(uint) ctx.CH(off-1);
+}
+
+bool ISUNICODEWHITESPACE_(uint codepoint)
+{
+ return md_is_unicode_whitespace__(codepoint);
+}
+
+bool ISUNICODEWHITESPACE(MD_CTX* ctx, OFF off)
+{
+ return md_is_unicode_whitespace__(md_decode_utf8__(ctx.STR(off), ctx.size - (off), null));
+}
+
+bool ISUNICODEWHITESPACEBEFORE(MD_CTX* ctx, OFF off)
+{
+ return md_is_unicode_whitespace__(md_decode_utf8_before__(ctx, off));
+}
+
+bool ISUNICODEPUNCT(MD_CTX* ctx, OFF off)
+{
+ return md_is_unicode_punct__(md_decode_utf8__(ctx.STR(off), ctx.size - (off), null));
+}
+
+bool ISUNICODEPUNCTBEFORE(MD_CTX* ctx, OFF off)
+{
+ return md_is_unicode_punct__(md_decode_utf8_before__(ctx, off));
+}
+
+uint md_decode_unicode(const(CHAR)* str, OFF off, SZ str_size, SZ* p_char_size)
+{
+ return md_decode_utf8__(str+off, str_size-off, p_char_size);
+}
+
+/*************************************
+ *** Helper string manipulations ***
+ *************************************/
+
+/* Fill buffer with copy of the string between 'beg' and 'end' but replace any
+ * line breaks with given replacement character.
+ *
+ * NOTE: Caller is responsible to make sure the buffer is large enough.
+ * (Given the output is always shorter then input, (end - beg) is good idea
+ * what the caller should allocate.)
+ */
+void md_merge_lines(MD_CTX* ctx, OFF beg, OFF end, const(MD_LINE)* lines, int n_lines,
+ CHAR line_break_replacement_char, CHAR* buffer, SZ* p_size)
+{
+ CHAR* ptr = buffer;
+ int line_index = 0;
+ OFF off = beg;
+
+ while(1) {
+ const MD_LINE* line = &lines[line_index];
+ OFF line_end = line.end;
+ if(end < line_end)
+ line_end = end;
+
+ while(off < line_end) {
+ *ptr = ctx.CH(off);
+ ptr++;
+ off++;
+ }
+
+ if(off >= end) {
+ *p_size = cast(uint)(ptr - buffer);
+ return;
+ }
+
+ *ptr = line_break_replacement_char;
+ ptr++;
+
+ line_index++;
+ off = lines[line_index].beg;
+ }
+}
+
+/* Wrapper of md_merge_lines() which allocates new buffer for the output string.
+ */
+int md_merge_lines_alloc(MD_CTX* ctx, OFF beg, OFF end, const(MD_LINE)* lines, int n_lines,
+ CHAR line_break_replacement_char, const(CHAR)** p_str, SZ* p_size)
+{
+ CHAR* buffer;
+
+ buffer = cast(CHAR*) malloc(CHAR.sizeof * (end - beg));
+ if(buffer == null) {
+ ctx.MD_LOG("malloc() failed.");
+ return -1;
+ }
+
+ md_merge_lines(ctx, beg, end, lines, n_lines,
+ line_break_replacement_char, buffer, p_size);
+
+ *p_str = buffer;
+ return 0;
+}
+
+OFF md_skip_unicode_whitespace(const(CHAR)* label, OFF off, SZ size)
+{
+ SZ char_size;
+ uint codepoint;
+
+ while(off < size) {
+ codepoint = md_decode_unicode(label, off, size, &char_size);
+ if(!ISUNICODEWHITESPACE_(codepoint) && !ISNEWLINE_(label[off]))
+ break;
+ off += char_size;
+ }
+
+ return off;
+}
+
+
+/******************************
+ *** Recognizing raw HTML ***
+ ******************************/
+
+/* md_is_html_tag() may be called when processing inlines (inline raw HTML)
+ * or when breaking document to blocks (checking for start of HTML block type 7).
+ *
+ * When breaking document to blocks, we do not yet know line boundaries, but
+ * in that case the whole tag has to live on a single line. We distinguish this
+ * by n_lines == 0.
+ */
+int md_is_html_tag(MD_CTX* ctx, const(MD_LINE)* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
+{
+ int attr_state;
+ OFF off = beg;
+ OFF line_end = (n_lines > 0) ? lines[0].end : ctx.size;
+ int i = 0;
+
+ assert(ctx.CH(beg) == '<');
+
+ if(off + 1 >= line_end)
+ return FALSE;
+ off++;
+
+ /* For parsing attributes, we need a little state automaton below.
+ * State -1: no attributes are allowed.
+ * State 0: attribute could follow after some whitespace.
+ * State 1: after a whitespace (attribute name may follow).
+ * State 2: after attribute name ('=' MAY follow).
+ * State 3: after '=' (value specification MUST follow).
+ * State 41: in middle of unquoted attribute value.
+ * State 42: in middle of single-quoted attribute value.
+ * State 43: in middle of double-quoted attribute value.
+ */
+ attr_state = 0;
+
+ if(ctx.CH(off) == '/') {
+ /* Closer tag "</ ... >". No attributes may be present. */
+ attr_state = -1;
+ off++;
+ }
+
+ /* Tag name */
+ if(off >= line_end || !ctx.ISALPHA(off))
+ return FALSE;
+ off++;
+ while(off < line_end && (ctx.ISALNUM(off) || ctx.CH(off) == '-'))
+ off++;
+
+ /* (Optional) attributes (if not closer), (optional) '/' (if not closer)
+ * and final '>'. */
+ while(1) {
+ while(off < line_end && !ctx.ISNEWLINE(off)) {
+ if(attr_state > 40) {
+ if(attr_state == 41 && (ctx.ISBLANK(off) || ctx.ISANYOF(off, "\"'=<>`"))) {
+ attr_state = 0;
+ off--; /* Put the char back for re-inspection in the new state. */
+ } else if(attr_state == 42 && ctx.CH(off) == '\'') {
+ attr_state = 0;
+ } else if(attr_state == 43 && ctx.CH(off) == '"') {
+ attr_state = 0;
+ }
+ off++;
+ } else if(ctx.ISWHITESPACE(off)) {
+ if(attr_state == 0)
+ attr_state = 1;
+ off++;
+ } else if(attr_state <= 2 && ctx.CH(off) == '>') {
+ /* End. */
+ goto done;
+ } else if(attr_state <= 2 && ctx.CH(off) == '/' && off+1 < line_end && ctx.CH(off+1) == '>') {
+ /* End with digraph '/>' */
+ off++;
+ goto done;
+ } else if((attr_state == 1 || attr_state == 2) && (ctx.ISALPHA(off) || ctx.CH(off) == '_' || ctx.CH(off) == ':')) {
+ off++;
+ /* Attribute name */
+ while(off < line_end && (ctx.ISALNUM(off) || ctx.ISANYOF(off, "_.:-")))
+ off++;
+ attr_state = 2;
+ } else if(attr_state == 2 && ctx.CH(off) == '=') {
+ /* Attribute assignment sign */
+ off++;
+ attr_state = 3;
+ } else if(attr_state == 3) {
+ /* Expecting start of attribute value. */
+ if(ctx.CH(off) == '"')
+ attr_state = 43;
+ else if(ctx.CH(off) == '\'')
+ attr_state = 42;
+ else if(!ctx.ISANYOF(off, "\"'=<>`") && !ctx.ISNEWLINE(off))
+ attr_state = 41;
+ else
+ return FALSE;
+ off++;
+ } else {
+ /* Anything unexpected. */
+ return FALSE;
+ }
+ }
+
+ /* We have to be on a single line. See definition of start condition
+ * of HTML block, type 7. */
+ if(n_lines == 0)
+ return FALSE;
+
+ i++;
+ if(i >= n_lines)
+ return FALSE;
+
+ off = lines[i].beg;
+ line_end = lines[i].end;
+
+ if(attr_state == 0 || attr_state == 41)
+ attr_state = 1;
+
+ if(off >= max_end)
+ return FALSE;
+ }
+
+done:
+ if(off >= max_end)
+ return FALSE;
+
+ *p_end = off+1;
+ return TRUE;
+}
+
+static int
+md_scan_for_html_closer(MD_CTX* ctx, const MD_CHAR* str, MD_SIZE len,
+ const MD_LINE* lines, int n_lines,
+ OFF beg, OFF max_end, OFF* p_end,
+ OFF* p_scan_horizon)
+{
+ OFF off = beg;
+ int i = 0;
+
+ if(off < *p_scan_horizon && *p_scan_horizon >= max_end - len) {
+ /* We have already scanned the range up to the max_end so we know
+ * there is nothing to see. */
+ return FALSE;
+ }
+
+ while(TRUE) {
+ while(off + len <= lines[i].end && off + len <= max_end) {
+ if(md_ascii_eq(ctx.STR(off), str, len)) {
+ /* Success. */
+ *p_end = off + len;
+ return TRUE;
+ }
+ off++;
+ }
+
+ i++;
+ if(off >= max_end || i >= n_lines) {
+ /* Failure. */
+ *p_scan_horizon = off;
+ return FALSE;
+ }
+
+ off = lines[i].beg;
+ }
+}
+
+static int
+md_is_html_comment(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg;
+
+ assert(ctx.CH(beg) == '<');
+
+ if(off + 4 >= lines[0].end)
+ return FALSE;
+ if(ctx.CH(off+1) != '!' || ctx.CH(off+2) != '-' || ctx.CH(off+3) != '-')
+ return FALSE;
+ off += 4;
+
+ /* ">" and "." must not follow the opening. */
+ if(off < lines[0].end && ctx.CH(off) == '>')
+ return FALSE;
+ if(off+1 < lines[0].end && ctx.CH(off) == '-' && ctx.CH(off+1) == '>')
+ return FALSE;
+
+ /* HTML comment must not contain "--", so we scan just for "--" instead
+ * of "-." and verify manually that '>' follows. */
+ if(md_scan_for_html_closer(ctx, "--", 2,
+ lines, n_lines, off, max_end, p_end, &ctx.html_comment_horizon))
+ {
+ if(*p_end < max_end && ctx.CH(*p_end) == '>') {
+ *p_end = *p_end + 1;
+ return TRUE;
+ }
+ }
+
+ return FALSE;
+}
+
+static int
+md_is_html_processing_instruction(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg;
+
+ if(off + 2 >= lines[0].end)
+ return FALSE;
+ if(ctx.CH(off+1) != '?')
+ return FALSE;
+ off += 2;
+
+ return md_scan_for_html_closer(ctx, "?>", 2,
+ lines, n_lines, off, max_end, p_end, &ctx.html_proc_instr_horizon);
+}
+
+static int
+md_is_html_declaration(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg;
+
+ if(off + 2 >= lines[0].end)
+ return FALSE;
+ if(ctx.CH(off+1) != '!')
+ return FALSE;
+ off += 2;
+
+ /* Declaration name. */
+ if(off >= lines[0].end || !ctx.ISALPHA(off))
+ return FALSE;
+ off++;
+ while(off < lines[0].end && ctx.ISALPHA(off))
+ off++;
+ if(off < lines[0].end && !ctx.ISWHITESPACE(off))
+ return FALSE;
+
+ return md_scan_for_html_closer(ctx, ">", 1,
+ lines, n_lines, off, max_end, p_end, &ctx.html_decl_horizon);
+}
+
+static int
+md_is_html_cdata(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
+{
+ string open_str = "<![CDATA[";
+
+ OFF off = beg;
+
+ if(off + open_str.length >= lines[0].end)
+ return FALSE;
+ if(memcmp(ctx.STR(off), open_str.ptr, open_str.length) != 0)
+ return FALSE;
+ off += open_str.length;
+
+ if(lines[n_lines-1].end < max_end)
+ max_end = lines[n_lines-1].end - 2;
+
+ return md_scan_for_html_closer(ctx, "]]>", 3,
+ lines, n_lines, off, max_end, p_end, &ctx.html_cdata_horizon);
+}
+
+static int
+md_is_html_any(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg, OFF max_end, OFF* p_end)
+{
+ assert(ctx.CH(beg) == '<');
+ return (md_is_html_tag(ctx, lines, n_lines, beg, max_end, p_end) ||
+ md_is_html_comment(ctx, lines, n_lines, beg, max_end, p_end) ||
+ md_is_html_processing_instruction(ctx, lines, n_lines, beg, max_end, p_end) ||
+ md_is_html_declaration(ctx, lines, n_lines, beg, max_end, p_end) ||
+ md_is_html_cdata(ctx, lines, n_lines, beg, max_end, p_end));
+}
+
+
+/****************************
+ *** Recognizing Entity ***
+ ****************************/
+
+static int
+md_is_hex_entity_contents(MD_CTX* ctx, const(CHAR)* text, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg;
+
+ while(off < max_end && ISXDIGIT_(text[off]) && off - beg <= 8)
+ off++;
+
+ if(1 <= off - beg && off - beg <= 6) {
+ *p_end = off;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static int
+md_is_dec_entity_contents(MD_CTX* ctx, const(CHAR)* text, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg;
+
+ while(off < max_end && ISDIGIT_(text[off]) && off - beg <= 8)
+ off++;
+
+ if(1 <= off - beg && off - beg <= 7) {
+ *p_end = off;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static int
+md_is_named_entity_contents(MD_CTX* ctx, const(CHAR)* text, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg;
+
+ if(off < max_end && ISALPHA_(text[off]))
+ off++;
+ else
+ return FALSE;
+
+ while(off < max_end && ISALNUM_(text[off]) && off - beg <= 48)
+ off++;
+
+ if(2 <= off - beg && off - beg <= 48) {
+ *p_end = off;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static int
+md_is_entity_str(MD_CTX* ctx, const(CHAR)* text, OFF beg, OFF max_end, OFF* p_end)
+{
+ int is_contents;
+ OFF off = beg;
+
+ assert(text[off] == '&');
+ off++;
+
+ if(off+2 < max_end && text[off] == '#' && (text[off+1] == 'x' || text[off+1] == 'X'))
+ is_contents = md_is_hex_entity_contents(ctx, text, off+2, max_end, &off);
+ else if(off+1 < max_end && text[off] == '#')
+ is_contents = md_is_dec_entity_contents(ctx, text, off+1, max_end, &off);
+ else
+ is_contents = md_is_named_entity_contents(ctx, text, off, max_end, &off);
+
+ if(is_contents && off < max_end && text[off] == ';') {
+ *p_end = off+1;
+ return TRUE;
+ } else {
+ return FALSE;
+ }
+}
+
+static int
+md_is_entity(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end)
+{
+ return md_is_entity_str(ctx, ctx.text, beg, max_end, p_end);
+}
+
+
+/******************************
+ *** Attribute Management ***
+ ******************************/
+
+struct MD_ATTRIBUTE_BUILD
+{
+ CHAR* text = null;
+ MD_TEXTTYPE* substr_types = null;
+ OFF* substr_offsets = null;
+ int substr_count = 0;
+ int substr_alloc = 0;
+ MD_TEXTTYPE[1] trivial_types = [0];
+ OFF[2] trivial_offsets = [0, 0];
+}
+
+
+enum MD_BUILD_ATTR_NO_ESCAPES = 0x0001;
+
+void* realloc_safe(void* ptr, size_t newSize)
+{
+ import core.stdc.stdlib : free, realloc;
+
+ if (newSize == 0)
+ {
+ free(ptr);
+ return null;
+ }
+
+ return realloc(ptr, newSize);
+}
+
+
+int md_build_attr_append_substr(MD_CTX* ctx, MD_ATTRIBUTE_BUILD* build,
+ MD_TEXTTYPE type, OFF off)
+{
+ if(build.substr_count >= build.substr_alloc) {
+ MD_TEXTTYPE* new_substr_types;
+ OFF* new_substr_offsets;
+
+ build.substr_alloc = (build.substr_alloc == 0 ? 8 : build.substr_alloc * 2);
+
+ new_substr_types = cast(MD_TEXTTYPE*) realloc_safe(build.substr_types,
+ build.substr_alloc * MD_TEXTTYPE.sizeof);
+ if(new_substr_types == null) {
+ ctx.MD_LOG("realloc() failed.");
+ return -1;
+ }
+ /* Note +1 to reserve space for final offset (== raw_size). */
+ new_substr_offsets = cast(OFF*) realloc_safe(build.substr_offsets,
+ (build.substr_alloc+1) * OFF.sizeof);
+ if(new_substr_offsets == null) {
+ ctx.MD_LOG("realloc() failed.");
+ free(new_substr_types);
+ return -1;
+ }
+
+ build.substr_types = new_substr_types;
+ build.substr_offsets = new_substr_offsets;
+ }
+
+ build.substr_types[build.substr_count] = type;
+ build.substr_offsets[build.substr_count] = off;
+ build.substr_count++;
+ return 0;
+}
+
+void md_free_attribute(MD_CTX* ctx, MD_ATTRIBUTE_BUILD* build)
+{
+ if(build.substr_alloc > 0) {
+ free(build.text);
+ free(build.substr_types);
+ free(build.substr_offsets);
+ }
+}
+
+int md_build_attribute(MD_CTX* ctx, const(CHAR)* raw_text, SZ raw_size,
+ uint flags, MD_ATTRIBUTE* attr, MD_ATTRIBUTE_BUILD* build)
+{
+ OFF raw_off, off;
+ int is_trivial;
+ int ret = 0;
+
+ memset(build, 0, MD_ATTRIBUTE_BUILD.sizeof);
+
+ /* If there is no backslash and no ampersand, build trivial attribute
+ * without any malloc(). */
+ is_trivial = TRUE;
+ for(raw_off = 0; raw_off < raw_size; raw_off++) {
+ if(ISANYOF3_(raw_text[raw_off], '\\', '&', '\0')) {
+ is_trivial = FALSE;
+ break;
+ }
+ }
+
+ if(is_trivial) {
+ build.text = cast(CHAR*) (raw_size ? raw_text : null);
+ build.substr_types = build.trivial_types.ptr;
+ build.substr_offsets = build.trivial_offsets.ptr;
+ build.substr_count = 1;
+ build.substr_alloc = 0;
+ build.trivial_types[0] = MD_TEXT_NORMAL;
+ build.trivial_offsets[0] = 0;
+ build.trivial_offsets[1] = raw_size;
+ off = raw_size;
+ } else {
+ build.text = cast(CHAR*) malloc(raw_size * CHAR.sizeof);
+ if(build.text == null) {
+ ctx.MD_LOG("malloc() failed.");
+ goto abort;
+ }
+
+ raw_off = 0;
+ off = 0;
+
+ while(raw_off < raw_size) {
+ if(raw_text[raw_off] == '\0') {
+ ret = (md_build_attr_append_substr(ctx, build, MD_TEXT_NULLCHAR, off));
+ if (ret < 0) goto abort;
+ memcpy(build.text + off, raw_text + raw_off, 1);
+ off++;
+ raw_off++;
+ continue;
+ }
+
+ if(raw_text[raw_off] == '&') {
+ OFF ent_end;
+
+ if(md_is_entity_str(ctx, raw_text, raw_off, raw_size, &ent_end)) {
+ ret = (md_build_attr_append_substr(ctx, build, MD_TEXT_ENTITY, off));
+ if (ret < 0) goto abort;
+ memcpy(build.text + off, raw_text + raw_off, ent_end - raw_off);
+ off += ent_end - raw_off;
+ raw_off = ent_end;
+ continue;
+ }
+ }
+
+ if(build.substr_count == 0 || build.substr_types[build.substr_count-1] != MD_TEXT_NORMAL)
+ {
+ ret = (md_build_attr_append_substr(ctx, build, MD_TEXT_NORMAL, off));
+ if (ret < 0) goto abort;
+ }
+
+ if(!(flags & MD_BUILD_ATTR_NO_ESCAPES) &&
+ raw_text[raw_off] == '\\' && raw_off+1 < raw_size &&
+ (ISPUNCT_(raw_text[raw_off+1]) || ISNEWLINE_(raw_text[raw_off+1])))
+ raw_off++;
+
+ build.text[off++] = raw_text[raw_off++];
+ }
+ build.substr_offsets[build.substr_count] = off;
+ }
+
+ attr.text = build.text;
+ attr.size = off;
+ attr.substr_offsets = build.substr_offsets;
+ attr.substr_types = build.substr_types;
+ return 0;
+
+abort:
+ md_free_attribute(ctx, build);
+ return -1;
+}
+
+
+/*********************************************
+ *** Dictionary of Reference Definitions ***
+ *********************************************/
+
+enum MD_FNV1A_BASE = 2166136261;
+enum MD_FNV1A_PRIME = 16777619;
+
+uint md_fnv1a(uint base, const(void)* data, size_t n)
+{
+ const(ubyte)* buf = cast(const(ubyte)*) data;
+ uint hash = base;
+ size_t i;
+
+ for(i = 0; i < n; i++) {
+ hash ^= buf[i];
+ hash *= MD_FNV1A_PRIME;
+ }
+
+ return hash;
+}
+
+
+struct MD_REF_DEF
+{
+ const(CHAR)* label;
+ const(CHAR)* title;
+ uint hash;
+ SZ label_size;
+ bool label_needs_free;
+ bool title_needs_free;
+ SZ title_size;
+ OFF dest_beg;
+ OFF dest_end;
+};
+
+/* Label equivalence is quite complicated with regards to whitespace and case
+ * folding. This complicates computing a hash of it as well as direct comparison
+ * of two labels. */
+
+uint md_link_label_hash(const(CHAR)* label, SZ size)
+{
+ uint hash = MD_FNV1A_BASE;
+ OFF off;
+ uint codepoint;
+ int is_whitespace = FALSE;
+
+ off = md_skip_unicode_whitespace(label, 0, size);
+ while(off < size) {
+ SZ char_size;
+
+ codepoint = md_decode_unicode(label, off, size, &char_size);
+ is_whitespace = ISUNICODEWHITESPACE_(codepoint) || ISNEWLINE_(label[off]);
+
+ if(is_whitespace) {
+ codepoint = ' ';
+ hash = md_fnv1a(hash, &codepoint, uint.sizeof);
+ off = md_skip_unicode_whitespace(label, off, size);
+ } else {
+ MD_UNICODE_FOLD_INFO fold_info;
+
+ md_get_unicode_fold_info(codepoint, &fold_info);
+ hash = md_fnv1a(hash, fold_info.codepoints.ptr, fold_info.n_codepoints * uint.sizeof);
+ off += char_size;
+ }
+ }
+
+ return hash;
+}
+
+OFF md_link_label_cmp_load_fold_info(const(CHAR)* label, OFF off, SZ size,
+ MD_UNICODE_FOLD_INFO* fold_info)
+{
+ uint codepoint;
+ SZ char_size;
+
+ if(off >= size) {
+ /* Treat end of link label as a whitespace. */
+ goto whitespace;
+ }
+
+ if(ISNEWLINE_(label[off])) {
+ /* Treat new lines as a whitespace. */
+ off++;
+ goto whitespace;
+ }
+
+ codepoint = md_decode_unicode(label, off, size, &char_size);
+ off += char_size;
+ if(ISUNICODEWHITESPACE_(codepoint)) {
+ /* Treat all whitespace as equivalent */
+ goto whitespace;
+ }
+
+ /* Get real folding info. */
+ md_get_unicode_fold_info(codepoint, fold_info);
+ return off;
+
+whitespace:
+ fold_info.codepoints[0] = ' ';
+ fold_info.n_codepoints = 1;
+ return off;
+}
+
+static int
+md_link_label_cmp(const(CHAR)* a_label, SZ a_size, const(CHAR)* b_label, SZ b_size)
+{
+ OFF a_off;
+ OFF b_off;
+ int a_reached_end = FALSE;
+ int b_reached_end = FALSE;
+ MD_UNICODE_FOLD_INFO a_fi = { 0 };
+ MD_UNICODE_FOLD_INFO b_fi = { 0 };
+ OFF a_fi_off = 0;
+ OFF b_fi_off = 0;
+ int cmp;
+
+ a_off = md_skip_unicode_whitespace(a_label, 0, a_size);
+ b_off = md_skip_unicode_whitespace(b_label, 0, b_size);
+ while(!a_reached_end && !b_reached_end) {
+ /* If needed, load fold info for next char. */
+ if(a_fi_off >= a_fi.n_codepoints) {
+ a_fi_off = 0;
+ a_off = md_link_label_cmp_load_fold_info(a_label, a_off, a_size, &a_fi);
+ a_reached_end = (a_off >= a_size);
+ }
+ if(b_fi_off >= b_fi.n_codepoints) {
+ b_fi_off = 0;
+ b_off = md_link_label_cmp_load_fold_info(b_label, b_off, b_size, &b_fi);
+ b_reached_end = (b_off >= b_size);
+ }
+
+ cmp = b_fi.codepoints[b_fi_off] - a_fi.codepoints[a_fi_off];
+ if(cmp != 0)
+ return cmp;
+
+ a_fi_off++;
+ b_fi_off++;
+ }
+
+ return 0;
+}
+
+struct MD_REF_DEF_LIST
+{
+nothrow:
+@nogc:
+
+ int n_ref_defs;
+ int alloc_ref_defs;
+
+ /* Valid items always point into ctx.ref_defs[] */
+ MD_REF_DEF* ref_defs_space; // Starting here, a list of pointer at the end of the struct
+
+ // To allocate a MD_REF_DEF_LIST
+ static size_t SIZEOF(int numDefRefs)
+ {
+ return 8 + (MD_REF_DEF*).sizeof * numDefRefs;
+ }
+
+ // Returns: a slice of ref defs embedded at the end of the struct
+ static MD_REF_DEF*[] refDefs(MD_REF_DEF_LIST* list)
+ {
+ return (&(list.ref_defs_space))[0..list.n_ref_defs];
+ }
+
+ ref MD_REF_DEF* ref_defs_nth(size_t index)
+ {
+ MD_REF_DEF** base = &ref_defs_space;
+ return base[index];
+ }
+}
+
+extern(C) int md_ref_def_cmp(scope const(void)* a, scope const void* b)
+{
+ const(MD_REF_DEF)* a_ref = *cast(const(MD_REF_DEF*)*)a;
+ const(MD_REF_DEF)* b_ref = *cast(const(MD_REF_DEF*)*)b;
+
+ if(a_ref.hash < b_ref.hash)
+ return -1;
+ else if(a_ref.hash > b_ref.hash)
+ return +1;
+ else
+ return md_link_label_cmp(a_ref.label, a_ref.label_size, b_ref.label, b_ref.label_size);
+}
+
+extern(C) int md_ref_def_cmp_stable(scope const(void)* a, scope const(void)* b)
+{
+ int cmp;
+
+ cmp = md_ref_def_cmp(a, b);
+
+ /* Ensure stability of the sorting. */
+ if(cmp == 0) {
+ const(MD_REF_DEF)* a_ref = *cast(const(MD_REF_DEF*)*)a;
+ const(MD_REF_DEF)* b_ref = *cast(const(MD_REF_DEF*)*)b;
+
+ if(a_ref < b_ref)
+ cmp = -1;
+ else if(a_ref > b_ref)
+ cmp = +1;
+ else
+ cmp = 0;
+ }
+
+ return cmp;
+}
+
+int md_build_ref_def_hashtable(MD_CTX* ctx)
+{
+ int i, j;
+
+ if(ctx.n_ref_defs == 0)
+ return 0;
+
+ ctx.ref_def_hashtable_size = (ctx.n_ref_defs * 5) / 4;
+ ctx.ref_def_hashtable = cast(void**) malloc(ctx.ref_def_hashtable_size * (void*).sizeof);
+ if(ctx.ref_def_hashtable == null) {
+ ctx.MD_LOG("malloc() failed.");
+ goto abort;
+ }
+ memset(ctx.ref_def_hashtable, 0, ctx.ref_def_hashtable_size * (void*).sizeof);
+
+ /* Each member of ctx.ref_def_hashtable[] can be:
+ * -- null,
+ * -- pointer to the MD_REF_DEF in ctx.ref_defs[], or
+ * -- pointer to a MD_REF_DEF_LIST, which holds multiple pointers to
+ * such MD_REF_DEFs.
+ */
+ for(i = 0; i < ctx.n_ref_defs; i++) {
+ MD_REF_DEF* def = &ctx.ref_defs[i];
+ void* bucket;
+ MD_REF_DEF_LIST* list;
+
+ def.hash = md_link_label_hash(def.label, def.label_size);
+ bucket = ctx.ref_def_hashtable[def.hash % ctx.ref_def_hashtable_size];
+
+ if(bucket == null) {
+ ctx.ref_def_hashtable[def.hash % ctx.ref_def_hashtable_size] = def;
+ continue;
+ }
+
+ if(ctx.ref_defs <= cast(MD_REF_DEF*) bucket && cast(MD_REF_DEF*) bucket < ctx.ref_defs + ctx.n_ref_defs) {
+ /* The bucket already contains one ref. def. Lets see whether it
+ * is the same label (ref. def. duplicate) or different one
+ * (hash conflict). */
+ MD_REF_DEF* old_def = cast(MD_REF_DEF*) bucket;
+
+ if(md_link_label_cmp(def.label, def.label_size, old_def.label, old_def.label_size) == 0) {
+ /* Ignore this ref. def. */
+ continue;
+ }
+
+ /* Make the bucket capable of holding more ref. defs. */
+ list = cast(MD_REF_DEF_LIST*) malloc(MD_REF_DEF_LIST.SIZEOF(4));
+ if(list == null) {
+ ctx.MD_LOG("malloc() failed.");
+ goto abort;
+ }
+ list.ref_defs_nth(0) = old_def;
+ list.ref_defs_nth(1) = def;
+ list.n_ref_defs = 2;
+ list.alloc_ref_defs = 4;
+ ctx.ref_def_hashtable[def.hash % ctx.ref_def_hashtable_size] = list;
+ continue;
+ }
+
+ /* Append the def to the bucket list. */
+ list = cast(MD_REF_DEF_LIST*) bucket;
+ if(list.n_ref_defs >= list.alloc_ref_defs) {
+ MD_REF_DEF_LIST* list_tmp = cast(MD_REF_DEF_LIST*) realloc_safe(list, MD_REF_DEF_LIST.SIZEOF( 2 * list.alloc_ref_defs ));
+ if(list_tmp == null) {
+ ctx.MD_LOG("realloc() failed.");
+ goto abort;
+ }
+ list = list_tmp;
+ list.alloc_ref_defs *= 2;
+ ctx.ref_def_hashtable[def.hash % ctx.ref_def_hashtable_size] = list;
+ }
+
+ list.ref_defs_nth(list.n_ref_defs) = def;
+ list.n_ref_defs++;
+ }
+
+ /* Sort the complex buckets so we can use bsearch() with them. */
+ for(i = 0; i < ctx.ref_def_hashtable_size; i++) {
+ void* bucket = ctx.ref_def_hashtable[i];
+ MD_REF_DEF_LIST* list;
+
+ if(bucket == null)
+ continue;
+ if(ctx.ref_defs <= cast(MD_REF_DEF*) bucket && cast(MD_REF_DEF*) bucket < ctx.ref_defs + ctx.n_ref_defs)
+ continue;
+
+ list = cast(MD_REF_DEF_LIST*) bucket;
+ qsort(MD_REF_DEF_LIST.refDefs(list).ptr, list.n_ref_defs, (MD_REF_DEF*).sizeof, &md_ref_def_cmp_stable);
+
+ /* Disable duplicates. */
+ for(j = 1; j < list.n_ref_defs; j++) {
+ if(md_ref_def_cmp(&list.ref_defs_nth(j-1), &list.ref_defs_nth(j)) == 0)
+ list.ref_defs_nth(j) = list.ref_defs_nth(j-1);
+ }
+ }
+
+ return 0;
+
+abort:
+ return -1;
+}
+
+static void
+md_free_ref_def_hashtable(MD_CTX* ctx)
+{
+ if(ctx.ref_def_hashtable != null) {
+ int i;
+
+ for(i = 0; i < ctx.ref_def_hashtable_size; i++) {
+ void* bucket = ctx.ref_def_hashtable[i];
+ if(bucket == null)
+ continue;
+ if(ctx.ref_defs <= cast(MD_REF_DEF*) bucket && cast(MD_REF_DEF*) bucket < ctx.ref_defs + ctx.n_ref_defs)
+ continue;
+ free(bucket);
+ }
+
+ free(ctx.ref_def_hashtable);
+ }
+}
+
+const(MD_REF_DEF)* md_lookup_ref_def(MD_CTX* ctx, const(CHAR)* label, SZ label_size)
+{
+ uint hash;
+ void* bucket;
+
+ if(ctx.ref_def_hashtable_size == 0)
+ return null;
+
+ hash = md_link_label_hash(label, label_size);
+ bucket = ctx.ref_def_hashtable[hash % ctx.ref_def_hashtable_size];
+
+ if(bucket == null) {
+ return null;
+ } else if(ctx.ref_defs <= cast(MD_REF_DEF*) bucket && cast(MD_REF_DEF*) bucket < ctx.ref_defs + ctx.n_ref_defs) {
+ const MD_REF_DEF* def = cast(MD_REF_DEF*) bucket;
+
+ if(md_link_label_cmp(def.label, def.label_size, label, label_size) == 0)
+ return def;
+ else
+ return null;
+ } else {
+ MD_REF_DEF_LIST* list = cast(MD_REF_DEF_LIST*) bucket;
+ MD_REF_DEF key_buf;
+ const MD_REF_DEF* key = &key_buf;
+ const(MD_REF_DEF*)* ret;
+
+ key_buf.label = cast(CHAR*) label;
+ key_buf.label_size = label_size;
+ key_buf.hash = md_link_label_hash(key_buf.label, key_buf.label_size);
+
+ ret = cast(const(MD_REF_DEF*)*) bsearch(&key, MD_REF_DEF_LIST.refDefs(list).ptr,
+ list.n_ref_defs, (MD_REF_DEF*).sizeof, &md_ref_def_cmp);
+ if(ret != null)
+ return *ret;
+ else
+ return null;
+ }
+}
+
+
+/***************************
+ *** Recognizing Links ***
+ ***************************/
+
+/* Note this code is partially shared between processing inlines and blocks
+ * as reference definitions and links share some helper parser functions.
+ */
+
+struct MD_LINK_ATTR
+{
+ OFF dest_beg;
+ OFF dest_end;
+
+ const(CHAR)* title;
+ SZ title_size;
+ bool title_needs_free;
+}
+
+
+static int
+md_is_link_label(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg,
+ OFF* p_end, int* p_beg_line_index, int* p_end_line_index,
+ OFF* p_contents_beg, OFF* p_contents_end)
+{
+ OFF off = beg;
+ OFF contents_beg = 0;
+ OFF contents_end = 0;
+ int line_index = 0;
+ int len = 0;
+
+ if(ctx.CH(off) != '[')
+ return FALSE;
+ off++;
+
+ while(1) {
+ OFF line_end = lines[line_index].end;
+
+ while(off < line_end) {
+ if(ctx.CH(off) == '\\' && off+1 < ctx.size && (ctx.ISPUNCT(off+1) || ctx.ISNEWLINE(off+1))) {
+ if(contents_end == 0) {
+ contents_beg = off;
+ *p_beg_line_index = line_index;
+ }
+ contents_end = off + 2;
+ off += 2;
+ } else if(ctx.CH(off) == '[') {
+ return FALSE;
+ } else if(ctx.CH(off) == ']') {
+ if(contents_beg < contents_end) {
+ /* Success. */
+ *p_contents_beg = contents_beg;
+ *p_contents_end = contents_end;
+ *p_end = off+1;
+ *p_end_line_index = line_index;
+ return TRUE;
+ } else {
+ /* Link label must have some non-whitespace contents. */
+ return FALSE;
+ }
+ } else {
+ uint codepoint;
+ SZ char_size;
+
+ codepoint = md_decode_unicode(ctx.text, off, ctx.size, &char_size);
+ if(!ISUNICODEWHITESPACE_(codepoint)) {
+ if(contents_end == 0) {
+ contents_beg = off;
+ *p_beg_line_index = line_index;
+ }
+ contents_end = off + char_size;
+ }
+
+ off += char_size;
+ }
+
+ len++;
+ if(len > 999)
+ return FALSE;
+ }
+
+ line_index++;
+ len++;
+ if(line_index < n_lines)
+ off = lines[line_index].beg;
+ else
+ break;
+ }
+
+ return FALSE;
+}
+
+static int
+md_is_link_destination_A(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end,
+ OFF* p_contents_beg, OFF* p_contents_end)
+{
+ OFF off = beg;
+
+ if(off >= max_end || ctx.CH(off) != '<')
+ return FALSE;
+ off++;
+
+ while(off < max_end) {
+ if(ctx.CH(off) == '\\' && off+1 < max_end && ctx.ISPUNCT(off+1)) {
+ off += 2;
+ continue;
+ }
+
+ if(ctx.ISNEWLINE(off) || ctx.CH(off) == '<')
+ return FALSE;
+
+ if(ctx.CH(off) == '>') {
+ /* Success. */
+ *p_contents_beg = beg+1;
+ *p_contents_end = off;
+ *p_end = off+1;
+ return TRUE;
+ }
+
+ off++;
+ }
+
+ return FALSE;
+}
+
+static int
+md_is_link_destination_B(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end,
+ OFF* p_contents_beg, OFF* p_contents_end)
+{
+ OFF off = beg;
+ int parenthesis_level = 0;
+
+ while(off < max_end) {
+ if(ctx.CH(off) == '\\' && off+1 < max_end && ctx.ISPUNCT(off+1)) {
+ off += 2;
+ continue;
+ }
+
+ if(ctx.ISWHITESPACE(off) || ctx.ISCNTRL(off))
+ break;
+
+ /* Link destination may include balanced pairs of unescaped '(' ')'.
+ * Note we limit the maximal nesting level by 32 to protect us from
+ * https://github.com/jgm/cmark/issues/214 */
+ if(ctx.CH(off) == '(') {
+ parenthesis_level++;
+ if(parenthesis_level > 32)
+ return FALSE;
+ } else if(ctx.CH(off) == ')') {
+ if(parenthesis_level == 0)
+ break;
+ parenthesis_level--;
+ }
+
+ off++;
+ }
+
+ if(parenthesis_level != 0 || off == beg)
+ return FALSE;
+
+ /* Success. */
+ *p_contents_beg = beg;
+ *p_contents_end = off;
+ *p_end = off;
+ return TRUE;
+}
+
+static int
+md_is_link_destination(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end,
+ OFF* p_contents_beg, OFF* p_contents_end)
+{
+ if(ctx.CH(beg) == '<')
+ return md_is_link_destination_A(ctx, beg, max_end, p_end, p_contents_beg, p_contents_end);
+ else
+ return md_is_link_destination_B(ctx, beg, max_end, p_end, p_contents_beg, p_contents_end);
+}
+
+static int
+md_is_link_title(MD_CTX* ctx, const MD_LINE* lines, int n_lines, OFF beg,
+ OFF* p_end, int* p_beg_line_index, int* p_end_line_index,
+ OFF* p_contents_beg, OFF* p_contents_end)
+{
+ OFF off = beg;
+ CHAR closer_char;
+ int line_index = 0;
+
+ /* White space with up to one line break. */
+ while(off < lines[line_index].end && ctx.ISWHITESPACE(off))
+ off++;
+ if(off >= lines[line_index].end) {
+ line_index++;
+ if(line_index >= n_lines)
+ return FALSE;
+ off = lines[line_index].beg;
+ }
+ if(off == beg)
+ return FALSE;
+
+ *p_beg_line_index = line_index;
+
+ /* First char determines how to detect end of it. */
+ switch(ctx.CH(off)) {
+ case '"': closer_char = '"'; break;
+ case '\'': closer_char = '\''; break;
+ case '(': closer_char = ')'; break;
+ default: return FALSE;
+ }
+ off++;
+
+ *p_contents_beg = off;
+
+ while(line_index < n_lines) {
+ OFF line_end = lines[line_index].end;
+
+ while(off < line_end) {
+ if(ctx.CH(off) == '\\' && off+1 < ctx.size && (ctx.ISPUNCT(off+1) || ctx.ISNEWLINE(off+1))) {
+ off++;
+ } else if(ctx.CH(off) == closer_char) {
+ /* Success. */
+ *p_contents_end = off;
+ *p_end = off+1;
+ *p_end_line_index = line_index;
+ return TRUE;
+ } else if(closer_char == ')' && ctx.CH(off) == '(') {
+ /* ()-style title cannot contain (unescaped '(')) */
+ return FALSE;
+ }
+
+ off++;
+ }
+
+ line_index++;
+ }
+
+ return FALSE;
+}
+
+/* Returns 0 if it is not a reference definition.
+ *
+ * Returns N > 0 if it is a reference definition. N then corresponds to the
+ * number of lines forming it). In this case the definition is stored for
+ * resolving any links referring to it.
+ *
+ * Returns -1 in case of an error (out of memory).
+ */
+int md_is_link_reference_definition(MD_CTX* ctx, const(MD_LINE)* lines, int n_lines)
+{
+ OFF label_contents_beg;
+ OFF label_contents_end;
+ int label_contents_line_index = -1;
+ int label_is_multiline;
+ const(CHAR)* label;
+ SZ label_size;
+ bool label_needs_free = false;
+ OFF dest_contents_beg;
+ OFF dest_contents_end;
+ OFF title_contents_beg;
+ OFF title_contents_end;
+ int title_contents_line_index;
+ int title_is_multiline;
+ OFF off;
+ int line_index = 0;
+ int tmp_line_index;
+ MD_REF_DEF* def;
+ int ret;
+
+ /* Link label. */
+ if(!md_is_link_label(ctx, lines, n_lines, lines[0].beg,
+ &off, &label_contents_line_index, &line_index,
+ &label_contents_beg, &label_contents_end))
+ return FALSE;
+ label_is_multiline = (label_contents_line_index != line_index);
+
+ /* Colon. */
+ if(off >= lines[line_index].end || ctx.CH(off) != ':')
+ return FALSE;
+ off++;
+
+ /* Optional white space with up to one line break. */
+ while(off < lines[line_index].end && ctx.ISWHITESPACE(off))
+ off++;
+ if(off >= lines[line_index].end) {
+ line_index++;
+ if(line_index >= n_lines)
+ return FALSE;
+ off = lines[line_index].beg;
+ }
+
+ /* Link destination. */
+ if(!md_is_link_destination(ctx, off, lines[line_index].end,
+ &off, &dest_contents_beg, &dest_contents_end))
+ return FALSE;
+
+ /* (Optional) title. Note we interpret it as an title only if nothing
+ * more follows on its last line. */
+ if(md_is_link_title(ctx, lines + line_index, n_lines - line_index, off,
+ &off, &title_contents_line_index, &tmp_line_index,
+ &title_contents_beg, &title_contents_end)
+ && off >= lines[line_index + tmp_line_index].end)
+ {
+ title_is_multiline = (tmp_line_index != title_contents_line_index);
+ title_contents_line_index += line_index;
+ line_index += tmp_line_index;
+ } else {
+ /* Not a title. */
+ title_is_multiline = FALSE;
+ title_contents_beg = off;
+ title_contents_end = off;
+ title_contents_line_index = 0;
+ }
+
+ /* Nothing more can follow on the last line. */
+ if(off < lines[line_index].end)
+ return FALSE;
+
+ /* Construct label. */
+ if(!label_is_multiline) {
+ label = cast(CHAR*) ctx.STR(label_contents_beg);
+ label_size = label_contents_end - label_contents_beg;
+ label_needs_free = false;
+ } else {
+ ret = (md_merge_lines_alloc(ctx, label_contents_beg, label_contents_end,
+ lines + label_contents_line_index, n_lines - label_contents_line_index,
+ ' ', &label, &label_size));
+ if (ret < 0) goto abort;
+ label_needs_free = true;
+ }
+
+ /* Store the reference definition. */
+ if(ctx.n_ref_defs >= ctx.alloc_ref_defs) {
+ MD_REF_DEF* new_defs;
+
+ ctx.alloc_ref_defs = (ctx.alloc_ref_defs > 0 ? ctx.alloc_ref_defs * 2 : 16);
+ new_defs = cast(MD_REF_DEF*) realloc_safe(ctx.ref_defs, ctx.alloc_ref_defs * MD_REF_DEF.sizeof);
+ if(new_defs == null) {
+ ctx.MD_LOG("realloc() failed.");
+ ret = -1;
+ goto abort;
+ }
+
+ ctx.ref_defs = new_defs;
+ }
+
+ def = &ctx.ref_defs[ctx.n_ref_defs];
+ memset(def, 0, MD_REF_DEF.sizeof);
+
+ def.label = label;
+ def.label_size = label_size;
+ def.label_needs_free = label_needs_free;
+
+ def.dest_beg = dest_contents_beg;
+ def.dest_end = dest_contents_end;
+
+ if(title_contents_beg >= title_contents_end) {
+ def.title = null;
+ def.title_size = 0;
+ } else if(!title_is_multiline) {
+ def.title = cast(CHAR*) ctx.STR(title_contents_beg);
+ def.title_size = title_contents_end - title_contents_beg;
+ } else {
+ ret = (md_merge_lines_alloc(ctx, title_contents_beg, title_contents_end,
+ lines + title_contents_line_index, n_lines - title_contents_line_index,
+ '\n', &def.title, &def.title_size));
+ if (ret < 0) goto abort;
+ def.title_needs_free = true;
+ }
+
+ /* Success. */
+ ctx.n_ref_defs++;
+ return line_index + 1;
+
+abort:
+ /* Failure. */
+ if(label_needs_free)
+ free(cast(void*)label); // Note: const_cast here
+ return -1;
+}
+
+static int
+md_is_link_reference(MD_CTX* ctx, const(MD_LINE)* lines, int n_lines,
+ OFF beg, OFF end, MD_LINK_ATTR* attr)
+{
+ const(MD_REF_DEF)* def;
+ const(MD_LINE)* beg_line;
+ const(MD_LINE)* end_line;
+ const(CHAR)* label;
+ SZ label_size;
+ int ret;
+
+ assert(ctx.CH(beg) == '[' || ctx.CH(beg) == '!');
+ assert(ctx.CH(end-1) == ']');
+
+ beg += (ctx.CH(beg) == '!' ? 2 : 1);
+ end--;
+
+ /* Find lines corresponding to the beg and end positions. */
+ assert(lines[0].beg <= beg);
+ beg_line = lines;
+ while(beg >= beg_line.end)
+ beg_line++;
+
+ assert(end <= lines[n_lines-1].end);
+ end_line = beg_line;
+ while(end >= end_line.end)
+ end_line++;
+
+ if(beg_line != end_line) {
+ ret = (md_merge_lines_alloc(ctx, beg, end, beg_line,
+ cast(int)(n_lines - (beg_line - lines)), ' ', &label, &label_size));
+ if (ret < 0) goto abort;
+ } else {
+ label = cast(CHAR*) ctx.STR(beg);
+ label_size = end - beg;
+ }
+
+ def = md_lookup_ref_def(ctx, label, label_size);
+ if(def != null) {
+ attr.dest_beg = def.dest_beg;
+ attr.dest_end = def.dest_end;
+ attr.title = def.title;
+ attr.title_size = def.title_size;
+ attr.title_needs_free = false;
+ }
+
+ if(beg_line != end_line)
+ free(cast(void*)label); // Note: const_cast here
+
+ ret = (def != null);
+
+abort:
+ return ret;
+}
+
+static int
+md_is_inline_link_spec(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
+ OFF beg, OFF* p_end, MD_LINK_ATTR* attr)
+{
+ int line_index = 0;
+ int tmp_line_index;
+ OFF title_contents_beg;
+ OFF title_contents_end;
+ int title_contents_line_index;
+ int title_is_multiline;
+ OFF off = beg;
+ int ret = FALSE;
+
+ while(off >= lines[line_index].end)
+ line_index++;
+
+ assert(ctx.CH(off) == '(');
+ off++;
+
+ /* Optional white space with up to one line break. */
+ while(off < lines[line_index].end && ctx.ISWHITESPACE(off))
+ off++;
+ if(off >= lines[line_index].end && ctx.ISNEWLINE(off)) {
+ line_index++;
+ if(line_index >= n_lines)
+ return FALSE;
+ off = lines[line_index].beg;
+ }
+
+ /* Link destination may be omitted, but only when not also having a title. */
+ if(off < ctx.size && ctx.CH(off) == ')') {
+ attr.dest_beg = off;
+ attr.dest_end = off;
+ attr.title = null;
+ attr.title_size = 0;
+ attr.title_needs_free = false;
+ off++;
+ *p_end = off;
+ return TRUE;
+ }
+
+ /* Link destination. */
+ if(!md_is_link_destination(ctx, off, lines[line_index].end,
+ &off, &attr.dest_beg, &attr.dest_end))
+ return FALSE;
+
+ /* (Optional) title. */
+ if(md_is_link_title(ctx, lines + line_index, n_lines - line_index, off,
+ &off, &title_contents_line_index, &tmp_line_index,
+ &title_contents_beg, &title_contents_end))
+ {
+ title_is_multiline = (tmp_line_index != title_contents_line_index);
+ title_contents_line_index += line_index;
+ line_index += tmp_line_index;
+ } else {
+ /* Not a title. */
+ title_is_multiline = FALSE;
+ title_contents_beg = off;
+ title_contents_end = off;
+ title_contents_line_index = 0;
+ }
+
+ /* Optional whitespace followed with final ')'. */
+ while(off < lines[line_index].end && ctx.ISWHITESPACE(off))
+ off++;
+ if(off >= lines[line_index].end && ctx.ISNEWLINE(off)) {
+ line_index++;
+ if(line_index >= n_lines)
+ return FALSE;
+ off = lines[line_index].beg;
+ }
+ if(ctx.CH(off) != ')')
+ goto abort;
+ off++;
+
+ if(title_contents_beg >= title_contents_end) {
+ attr.title = null;
+ attr.title_size = 0;
+ attr.title_needs_free = false;
+ } else if(!title_is_multiline) {
+ attr.title = cast(CHAR*) ctx.STR(title_contents_beg); // Note: const_cast here!
+ attr.title_size = title_contents_end - title_contents_beg;
+ attr.title_needs_free = false;
+ } else {
+ ret = (md_merge_lines_alloc(ctx, title_contents_beg, title_contents_end,
+ lines + title_contents_line_index, n_lines - title_contents_line_index,
+ '\n', &attr.title, &attr.title_size));
+ if (ret < 0) goto abort;
+ attr.title_needs_free = true;
+ }
+
+ *p_end = off;
+ ret = TRUE;
+
+abort:
+ return ret;
+}
+
+void md_free_ref_defs(MD_CTX* ctx)
+{
+ int i;
+
+ for(i = 0; i < ctx.n_ref_defs; i++) {
+ MD_REF_DEF* def = &ctx.ref_defs[i];
+
+ if(def.label_needs_free)
+ free(cast(void*)def.label); // Note: const_cast here
+ if(def.title_needs_free)
+ free(cast(void*)def.title); // Note: const_cast here
+ }
+
+ free(ctx.ref_defs);
+}
+
+
+/******************************************
+ *** Processing Inlines (a.k.a Spans) ***
+ ******************************************/
+
+/* We process inlines in few phases:
+ *
+ * (1) We go through the block text and collect all significant characters
+ * which may start/end a span or some other significant position into
+ * ctx.marks[]. Core of this is what md_collect_marks() does.
+ *
+ * We also do some very brief preliminary context-less analysis, whether
+ * it might be opener or closer (e.g. of an emphasis span).
+ *
+ * This speeds the other steps as we do not need to re-iterate over all
+ * characters anymore.
+ *
+ * (2) We analyze each potential mark types, in order by their precedence.
+ *
+ * In each md_analyze_XXX() function, we re-iterate list of the marks,
+ * skipping already resolved regions (in preceding precedences) and try to
+ * resolve them.
+ *
+ * (2.1) For trivial marks, which are single (e.g. HTML entity), we just mark
+ * them as resolved.
+ *
+ * (2.2) For range-type marks, we analyze whether the mark could be closer
+ * and, if yes, whether there is some preceding opener it could satisfy.
+ *
+ * If not we check whether it could be really an opener and if yes, we
+ * remember it so subsequent closers may resolve it.
+ *
+ * (3) Finally, when all marks were analyzed, we render the block contents
+ * by calling MD_RENDERER::text() callback, interrupting by ::enter_span()
+ * or ::close_span() whenever we reach a resolved mark.
+ */
+
+
+/* The mark structure.
+ *
+ * '\\': Maybe escape sequence.
+ * '\0': null char.
+ * '*': Maybe (strong) emphasis start/end.
+ * '_': Maybe (strong) emphasis start/end.
+ * '~': Maybe strikethrough start/end (needs MD_FLAG_STRIKETHROUGH).
+ * '`': Maybe code span start/end.
+ * '&': Maybe start of entity.
+ * ';': Maybe end of entity.
+ * '<': Maybe start of raw HTML or autolink.
+ * '>': Maybe end of raw HTML or autolink.
+ * '[': Maybe start of link label or link text.
+ * '!': Equivalent of '[' for image.
+ * ']': Maybe end of link label or link text.
+ * '@': Maybe permissive e-mail auto-link (needs MD_FLAG_PERMISSIVEEMAILAUTOLINKS).
+ * ':': Maybe permissive URL auto-link (needs MD_FLAG_PERMISSIVEURLAUTOLINKS).
+ * '.': Maybe permissive WWW auto-link (needs MD_FLAG_PERMISSIVEWWWAUTOLINKS).
+ * 'D': Dummy mark, it reserves a space for splitting a previous mark
+ * (e.g. emphasis) or to make more space for storing some special data
+ * related to the preceding mark (e.g. link).
+ *
+ * Note that not all instances of these chars in the text imply creation of the
+ * structure. Only those which have (or may have, after we see more context)
+ * the special meaning.
+ *
+ * (Keep this struct as small as possible to fit as much of them into CPU
+ * cache line.)
+ */
+
+struct MD_MARK {
+ OFF beg;
+ OFF end;
+
+ /* For unresolved openers, 'prev' and 'next' form the chain of open openers
+ * of given type 'ch'.
+ *
+ * During resolving, we disconnect from the chain and point to the
+ * corresponding counterpart so opener points to its closer and vice versa.
+ */
+ int prev;
+ int next;
+ CHAR ch;
+ ubyte flags;
+};
+
+/* Mark flags (these apply to ALL mark types). */
+enum MD_MARK_POTENTIAL_OPENER = 0x01; /* Maybe opener. */
+enum MD_MARK_POTENTIAL_CLOSER = 0x02; /* Maybe closer. */
+enum MD_MARK_OPENER = 0x04; /* Definitely opener. */
+enum MD_MARK_CLOSER = 0x08; /* Definitely closer. */
+enum MD_MARK_RESOLVED = 0x10; /* Resolved in any definite way. */
+
+/* Mark flags specific for various mark types (so they can share bits). */
+enum MD_MARK_EMPH_INTRAWORD = 0x20; /* Helper for the "rule of 3". */
+enum MD_MARK_EMPH_MOD3_0 = 0x40;
+enum MD_MARK_EMPH_MOD3_1 = 0x80;
+enum MD_MARK_EMPH_MOD3_2 = (0x40 | 0x80);
+enum MD_MARK_EMPH_MOD3_MASK = (0x40 | 0x80);
+enum MD_MARK_AUTOLINK = 0x20; /* Distinguisher for '<', '>'. */
+enum MD_MARK_VALIDPERMISSIVEAUTOLINK = 0x20; /* For permissive autolinks. */
+
+MD_MARKCHAIN* md_asterisk_chain(MD_CTX* ctx, uint flags)
+{
+ switch(flags & (MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_MASK))
+ {
+ case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_0: return ctx.ASTERISK_OPENERS_intraword_mod3_0;
+ case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_1: return ctx.ASTERISK_OPENERS_intraword_mod3_1;
+ case MD_MARK_EMPH_INTRAWORD | MD_MARK_EMPH_MOD3_2: return ctx.ASTERISK_OPENERS_intraword_mod3_2;
+ case MD_MARK_EMPH_MOD3_0: return ctx.ASTERISK_OPENERS_extraword_mod3_0;
+ case MD_MARK_EMPH_MOD3_1: return ctx.ASTERISK_OPENERS_extraword_mod3_1;
+ case MD_MARK_EMPH_MOD3_2: return ctx.ASTERISK_OPENERS_extraword_mod3_2;
+ default: assert(false);
+ }
+}
+
+MD_MARKCHAIN* md_mark_chain(MD_CTX* ctx, int mark_index)
+{
+ MD_MARK* mark = &ctx.marks[mark_index];
+
+ switch(mark.ch) {
+ case '*': return md_asterisk_chain(ctx, mark.flags);
+ case '_': return ctx.UNDERSCORE_OPENERS;
+ case '~': return ctx.TILDE_OPENERS;
+ case '[': return ctx.BRACKET_OPENERS;
+ case '|': return ctx.TABLECELLBOUNDARIES;
+ default: return null;
+ }
+}
+
+MD_MARK* md_push_mark(MD_CTX* ctx)
+{
+ if(ctx.n_marks >= ctx.alloc_marks) {
+ MD_MARK* new_marks;
+
+ ctx.alloc_marks = (ctx.alloc_marks > 0 ? ctx.alloc_marks * 2 : 64);
+ new_marks = cast(MD_MARK*) realloc_safe(ctx.marks, ctx.alloc_marks * MD_MARK.sizeof);
+ if(new_marks == null) {
+ ctx.MD_LOG("realloc() failed.");
+ return null;
+ }
+
+ ctx.marks = new_marks;
+ }
+
+ return &ctx.marks[ctx.n_marks++];
+}
+
+int PUSH_MARK_(MD_CTX* ctx, MD_MARK** mark)
+{
+ *mark = md_push_mark(ctx);
+ if(*mark == null)
+ {
+ return -1;
+ }
+ return 0;
+}
+
+int PUSH_MARK(MD_CTX* ctx, MD_MARK** mark, CHAR ch_, OFF beg_, OFF end_, int flags_)
+{
+ int ret = PUSH_MARK_(ctx, mark);
+ if (ret != 0)
+ return ret;
+
+ (*mark).beg = (beg_);
+ (*mark).end = (end_);
+ (*mark).prev = -1;
+ (*mark).next = -1;
+ (*mark).ch = cast(char)(ch_);
+ (*mark).flags = cast(ubyte)flags_;
+ return 0;
+}
+
+static void
+md_mark_chain_append(MD_CTX* ctx, MD_MARKCHAIN* chain, int mark_index)
+{
+ if(chain.tail >= 0)
+ ctx.marks[chain.tail].next = mark_index;
+ else
+ chain.head = mark_index;
+
+ ctx.marks[mark_index].prev = chain.tail;
+ chain.tail = mark_index;
+}
+
+/* Sometimes, we need to store a pointer into the mark. It is quite rare
+ * so we do not bother to make MD_MARK use union, and it can only happen
+ * for dummy marks. */
+void md_mark_store_ptr(MD_CTX* ctx, int mark_index, const(void)* ptr)
+{
+ MD_MARK* mark = &ctx.marks[mark_index];
+ assert(mark.ch == 'D');
+
+ /* Check only members beg and end are misused for this. */
+ assert((void*).sizeof <= 2 * OFF.sizeof);
+ memcpy(mark, &ptr, (void*).sizeof);
+}
+
+static void*
+md_mark_get_ptr(MD_CTX* ctx, int mark_index)
+{
+ void* ptr;
+ MD_MARK* mark = &ctx.marks[mark_index];
+ assert(mark.ch == 'D');
+ memcpy(&ptr, mark, (void*).sizeof);
+ return ptr;
+}
+
+static void
+md_resolve_range(MD_CTX* ctx, MD_MARKCHAIN* chain, int opener_index, int closer_index)
+{
+ MD_MARK* opener = &ctx.marks[opener_index];
+ MD_MARK* closer = &ctx.marks[closer_index];
+
+ /* Remove opener from the list of openers. */
+ if(chain != null) {
+ if(opener.prev >= 0)
+ ctx.marks[opener.prev].next = opener.next;
+ else
+ chain.head = opener.next;
+
+ if(opener.next >= 0)
+ ctx.marks[opener.next].prev = opener.prev;
+ else
+ chain.tail = opener.prev;
+ }
+
+ /* Interconnect opener and closer and mark both as resolved. */
+ opener.next = closer_index;
+ opener.flags |= MD_MARK_OPENER | MD_MARK_RESOLVED;
+ closer.prev = opener_index;
+ closer.flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED;
+}
+
+
+enum MD_ROLLBACK_ALL = 0;
+enum MD_ROLLBACK_CROSSING = 1;
+
+/* In the range ctx.marks[opener_index] ... [closer_index], undo some or all
+ * resolvings accordingly to these rules:
+ *
+ * (1) All openers BEFORE the range corresponding to any closer inside the
+ * range are un-resolved and they are re-added to their respective chains
+ * of unresolved openers. This ensures we can reuse the opener for closers
+ * AFTER the range.
+ *
+ * (2) If 'how' is MD_ROLLBACK_ALL, then ALL resolved marks inside the range
+ * are discarded.
+ *
+ * (3) If 'how' is MD_ROLLBACK_CROSSING, only closers with openers handled
+ * in (1) are discarded. I.e. pairs of openers and closers which are both
+ * inside the range are retained as well as any unpaired marks.
+ */
+static void
+md_rollback(MD_CTX* ctx, int opener_index, int closer_index, int how)
+{
+ int i;
+ int mark_index;
+
+ /* Cut all unresolved openers at the mark index. */
+ for(i = OPENERS_CHAIN_FIRST; i < OPENERS_CHAIN_LAST+1; i++) {
+ MD_MARKCHAIN* chain = &ctx.mark_chains[i];
+
+ while(chain.tail >= opener_index)
+ chain.tail = ctx.marks[chain.tail].prev;
+
+ if(chain.tail >= 0)
+ ctx.marks[chain.tail].next = -1;
+ else
+ chain.head = -1;
+ }
+
+ /* Go backwards so that un-resolved openers are re-added into their
+ * respective chains, in the right order. */
+ mark_index = closer_index - 1;
+ while(mark_index > opener_index) {
+ MD_MARK* mark = &ctx.marks[mark_index];
+ int mark_flags = mark.flags;
+ int discard_flag = (how == MD_ROLLBACK_ALL);
+
+ if(mark.flags & MD_MARK_CLOSER) {
+ int mark_opener_index = mark.prev;
+
+ /* Undo opener BEFORE the range. */
+ if(mark_opener_index < opener_index) {
+ MD_MARK* mark_opener = &ctx.marks[mark_opener_index];
+ MD_MARKCHAIN* chain;
+
+ mark_opener.flags &= ~(MD_MARK_OPENER | MD_MARK_CLOSER | MD_MARK_RESOLVED);
+ chain = md_mark_chain(ctx, opener_index);
+ if(chain != null) {
+ md_mark_chain_append(ctx, chain, mark_opener_index);
+ discard_flag = 1;
+ }
+ }
+ }
+
+ /* And reset our flags. */
+ if(discard_flag)
+ mark.flags &= ~(MD_MARK_OPENER | MD_MARK_CLOSER | MD_MARK_RESOLVED);
+
+ /* Jump as far as we can over unresolved or non-interesting marks. */
+ switch(how) {
+ case MD_ROLLBACK_CROSSING:
+ if((mark_flags & MD_MARK_CLOSER) && mark.prev > opener_index) {
+ /* If we are closer with opener INSIDE the range, there may
+ * not be any other crosser inside the subrange. */
+ mark_index = mark.prev;
+ break;
+ }
+ goto default;
+ /* Pass through. */
+ default:
+ mark_index--;
+ break;
+ }
+ }
+}
+
+void md_build_mark_char_map(MD_CTX* ctx)
+{
+ memset(ctx.mark_char_map.ptr, 0, ctx.mark_char_map.length);
+
+ ctx.mark_char_map['\\'] = 1;
+ ctx.mark_char_map['*'] = 1;
+ ctx.mark_char_map['_'] = 1;
+ ctx.mark_char_map['`'] = 1;
+ ctx.mark_char_map['&'] = 1;
+ ctx.mark_char_map[';'] = 1;
+ ctx.mark_char_map['<'] = 1;
+ ctx.mark_char_map['>'] = 1;
+ ctx.mark_char_map['['] = 1;
+ ctx.mark_char_map['!'] = 1;
+ ctx.mark_char_map[']'] = 1;
+ ctx.mark_char_map['\0'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_STRIKETHROUGH)
+ ctx.mark_char_map['~'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_LATEXMATHSPANS)
+ ctx.mark_char_map['$'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_PERMISSIVEEMAILAUTOLINKS)
+ ctx.mark_char_map['@'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_PERMISSIVEURLAUTOLINKS)
+ ctx.mark_char_map[':'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_PERMISSIVEWWWAUTOLINKS)
+ ctx.mark_char_map['.'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_TABLES)
+ ctx.mark_char_map['|'] = 1;
+
+ if(ctx.parser.flags & MD_FLAG_COLLAPSEWHITESPACE) {
+ int i;
+
+ for(i = 0; i < cast(int) (ctx.mark_char_map).sizeof; i++) {
+ if(ISWHITESPACE_(cast(CHAR)i))
+ ctx.mark_char_map[i] = 1;
+ }
+ }
+}
+
+/* We limit code span marks to lower then 32 backticks. This solves the
+ * pathologic case of too many openers, each of different length: Their
+ * resolving would be then O(n^2). */
+enum CODESPAN_MARK_MAXLEN = 32;
+
+int md_is_code_span(MD_CTX* ctx, const(MD_LINE)* lines, int n_lines, OFF beg,
+ OFF* p_opener_beg, OFF* p_opener_end,
+ OFF* p_closer_beg, OFF* p_closer_end,
+ OFF* last_potential_closers,
+ int* p_reached_paragraph_end)
+{
+ OFF opener_beg = beg;
+ OFF opener_end;
+ OFF closer_beg;
+ OFF closer_end;
+ SZ mark_len;
+ OFF line_end;
+ int has_space_after_opener = FALSE;
+ int has_eol_after_opener = FALSE;
+ int has_space_before_closer = FALSE;
+ int has_eol_before_closer = FALSE;
+ int has_only_space = TRUE;
+ int line_index = 0;
+
+ line_end = lines[0].end;
+ opener_end = opener_beg;
+ while(opener_end < line_end && ctx.CH(opener_end) == '`')
+ opener_end++;
+ has_space_after_opener = (opener_end < line_end && ctx.CH(opener_end) == ' ');
+ has_eol_after_opener = (opener_end == line_end);
+
+ /* The caller needs to know end of the opening mark even if we fail. */
+ *p_opener_end = opener_end;
+
+ mark_len = opener_end - opener_beg;
+ if(mark_len > CODESPAN_MARK_MAXLEN)
+ return FALSE;
+
+ /* Check whether we already know there is no closer of this length.
+ * If so, re-scan does no sense. This fixes issue #59. */
+ if(last_potential_closers[mark_len-1] >= lines[n_lines-1].end ||
+ (*p_reached_paragraph_end && last_potential_closers[mark_len-1] < opener_end))
+ return FALSE;
+
+ closer_beg = opener_end;
+ closer_end = opener_end;
+
+ /* Find closer mark. */
+ while(TRUE) {
+ while(closer_beg < line_end && ctx.CH(closer_beg) != '`') {
+ if(ctx.CH(closer_beg) != ' ')
+ has_only_space = FALSE;
+ closer_beg++;
+ }
+ closer_end = closer_beg;
+ while(closer_end < line_end && ctx.CH(closer_end) == '`')
+ closer_end++;
+
+ if(closer_end - closer_beg == mark_len) {
+ /* Success. */
+ has_space_before_closer = (closer_beg > lines[line_index].beg && ctx.CH(closer_beg-1) == ' ');
+ has_eol_before_closer = (closer_beg == lines[line_index].beg);
+ break;
+ }
+
+ if(closer_end - closer_beg > 0) {
+ /* We have found a back-tick which is not part of the closer. */
+ has_only_space = FALSE;
+
+ /* But if we eventually fail, remember it as a potential closer
+ * of its own length for future attempts. This mitigates needs for
+ * rescans. */
+ if(closer_end - closer_beg < CODESPAN_MARK_MAXLEN) {
+ if(closer_beg > last_potential_closers[closer_end - closer_beg - 1])
+ last_potential_closers[closer_end - closer_beg - 1] = closer_beg;
+ }
+ }
+
+ if(closer_end >= line_end) {
+ line_index++;
+ if(line_index >= n_lines) {
+ /* Reached end of the paragraph and still nothing. */
+ *p_reached_paragraph_end = TRUE;
+ return FALSE;
+ }
+ /* Try on the next line. */
+ line_end = lines[line_index].end;
+ closer_beg = lines[line_index].beg;
+ } else {
+ closer_beg = closer_end;
+ }
+ }
+
+ /* If there is a space or a new line both after and before the opener
+ * (and if the code span is not made of spaces only), consume one initial
+ * and one trailing space as part of the marks. */
+ if(!has_only_space &&
+ (has_space_after_opener || has_eol_after_opener) &&
+ (has_space_before_closer || has_eol_before_closer))
+ {
+ if(has_space_after_opener)
+ opener_end++;
+ else
+ opener_end = lines[1].beg;
+
+ if(has_space_before_closer)
+ closer_beg--;
+ else {
+ closer_beg = lines[line_index-1].end;
+ /* We need to eat the preceding "\r\n" but not any line trailing
+ * spaces. */
+ while(closer_beg < ctx.size && ctx.ISBLANK(closer_beg))
+ closer_beg++;
+ }
+ }
+
+ *p_opener_beg = opener_beg;
+ *p_opener_end = opener_end;
+ *p_closer_beg = closer_beg;
+ *p_closer_end = closer_end;
+ return TRUE;
+}
+
+static int
+md_is_autolink_uri(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg+1;
+
+ assert(ctx.CH(beg) == '<');
+
+ /* Check for scheme. */
+ if(off >= max_end || !ctx.ISASCII(off))
+ return FALSE;
+ off++;
+ while(1) {
+ if(off >= max_end)
+ return FALSE;
+ if(off - beg > 32)
+ return FALSE;
+ if(ctx.CH(off) == ':' && off - beg >= 3)
+ break;
+ if(!ctx.ISALNUM(off) && ctx.CH(off) != '+' && ctx.CH(off) != '-' && ctx.CH(off) != '.')
+ return FALSE;
+ off++;
+ }
+
+ /* Check the path after the scheme. */
+ while(off < max_end && ctx.CH(off) != '>') {
+ if(ctx.ISWHITESPACE(off) || ctx.ISCNTRL(off) || ctx.CH(off) == '<')
+ return FALSE;
+ off++;
+ }
+
+ if(off >= max_end)
+ return FALSE;
+
+ assert(ctx.CH(off) == '>');
+ *p_end = off+1;
+ return TRUE;
+}
+
+static int
+md_is_autolink_email(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end)
+{
+ OFF off = beg + 1;
+ int label_len;
+
+ assert(ctx.CH(beg) == '<');
+
+ /* The code should correspond to this regexp:
+ /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+
+ @[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?
+ (?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/
+ */
+
+ /* Username (before '@'). */
+ while(off < max_end && (ctx.ISALNUM(off) || ctx.ISANYOF(off, ".!#$%&'*+/=?^_`{|}~-")))
+ off++;
+ if(off <= beg+1)
+ return FALSE;
+
+ /* '@' */
+ if(off >= max_end || ctx.CH(off) != '@')
+ return FALSE;
+ off++;
+
+ /* Labels delimited with '.'; each label is sequence of 1 - 62 alnum
+ * characters or '-', but '-' is not allowed as first or last char. */
+ label_len = 0;
+ while(off < max_end) {
+ if(ctx.ISALNUM(off))
+ label_len++;
+ else if(ctx.CH(off) == '-' && label_len > 0)
+ label_len++;
+ else if(ctx.CH(off) == '.' && label_len > 0 && ctx.CH(off-1) != '-')
+ label_len = 0;
+ else
+ break;
+
+ if(label_len > 62)
+ return FALSE;
+
+ off++;
+ }
+
+ if(label_len <= 0 || off >= max_end || ctx.CH(off) != '>' || ctx.CH(off-1) == '-')
+ return FALSE;
+
+ *p_end = off+1;
+ return TRUE;
+}
+
+static int
+md_is_autolink(MD_CTX* ctx, OFF beg, OFF max_end, OFF* p_end, int* p_missing_mailto)
+{
+ if(md_is_autolink_uri(ctx, beg, max_end, p_end)) {
+ *p_missing_mailto = FALSE;
+ return TRUE;
+ }
+
+ if(md_is_autolink_email(ctx, beg, max_end, p_end)) {
+ *p_missing_mailto = TRUE;
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/* For 8-bit encodings, mark_char_map[] covers all 256 elements. */
+bool IS_MARK_CHAR(MD_CTX* ctx, OFF off)
+{
+ return (ctx.mark_char_map[cast(ubyte) ctx.CH(off)]) != 0;
+}
+
+int md_collect_marks(MD_CTX* ctx, const(MD_LINE)* lines, int n_lines, int table_mode)
+{
+ int i;
+ int ret = 0;
+ MD_MARK* mark;
+ OFF[CODESPAN_MARK_MAXLEN] codespan_last_potential_closers =
+ [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
+
+ int codespan_scanned_till_paragraph_end = FALSE;
+
+ for(i = 0; i < n_lines; i++)
+ {
+ const(MD_LINE)* line = &lines[i];
+ OFF off = line.beg;
+ OFF line_end = line.end;
+
+ while(true)
+ {
+ CHAR ch;
+
+ /* Optimization: Use some loop unrolling. */
+ while(off + 3 < line_end && !IS_MARK_CHAR(ctx, off+0) && !IS_MARK_CHAR(ctx, off+1)
+ && !IS_MARK_CHAR(ctx, off+2) && !IS_MARK_CHAR(ctx, off+3))
+ off += 4;
+ while(off < line_end && !IS_MARK_CHAR(ctx, off+0))
+ off++;
+
+ if(off >= line_end)
+ break;
+
+ ch = ctx.CH(off);
+
+ /* A backslash escape.
+ * It can go beyond line.end as it may involve escaped new
+ * line to form a hard break. */
+ if(ch == '\\' && off+1 < ctx.size && (ctx.ISPUNCT(off+1) || ctx.ISNEWLINE(off+1))) {
+ /* Hard-break cannot be on the last line of the block. */
+ if(!ctx.ISNEWLINE(off+1) || i+1 < n_lines)
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+2, MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ }
+ off += 2;
+ continue;
+ }
+
+ /* A potential (string) emphasis start/end. */
+ if(ch == '*' || ch == '_') {
+ OFF tmp = off+1;
+ int left_level; /* What precedes: 0 = whitespace; 1 = punctuation; 2 = other char. */
+ int right_level; /* What follows: 0 = whitespace; 1 = punctuation; 2 = other char. */
+
+ while(tmp < line_end && ctx.CH(tmp) == ch)
+ tmp++;
+
+ if(off == line.beg || ctx.ISUNICODEWHITESPACEBEFORE(off))
+ left_level = 0;
+ else if(ctx.ISUNICODEPUNCTBEFORE(off))
+ left_level = 1;
+ else
+ left_level = 2;
+
+ if(tmp == line_end || ctx.ISUNICODEWHITESPACE(tmp))
+ right_level = 0;
+ else if(ctx.ISUNICODEPUNCT(tmp))
+ right_level = 1;
+ else
+ right_level = 2;
+
+ /* Intra-word underscore doesn't have special meaning. */
+ if(ch == '_' && left_level == 2 && right_level == 2) {
+ left_level = 0;
+ right_level = 0;
+ }
+
+ if(left_level != 0 || right_level != 0) {
+ uint flags = 0;
+
+ if(left_level > 0 && left_level >= right_level)
+ flags |= MD_MARK_POTENTIAL_CLOSER;
+ if(right_level > 0 && right_level >= left_level)
+ flags |= MD_MARK_POTENTIAL_OPENER;
+ if(left_level == 2 && right_level == 2)
+ flags |= MD_MARK_EMPH_INTRAWORD;
+
+ /* For "the rule of three" we need to remember the original
+ * size of the mark (modulo three), before we potentially
+ * split the mark when being later resolved partially by some
+ * shorter closer. */
+ switch((tmp - off) % 3)
+ {
+ case 0: flags |= MD_MARK_EMPH_MOD3_0; break;
+ case 1: flags |= MD_MARK_EMPH_MOD3_1; break;
+ case 2: flags |= MD_MARK_EMPH_MOD3_2; break;
+ default: break;
+ }
+
+ ret = PUSH_MARK(ctx, &mark, ch, off, tmp, flags);
+ if (ret != 0) goto abort;
+
+ /* During resolving, multiple asterisks may have to be
+ * split into independent span start/ends. Consider e.g.
+ * "**foo* bar*". Therefore we push also some empty dummy
+ * marks to have enough space for that. */
+ off++;
+ while(off < tmp) {
+ ret = PUSH_MARK(ctx, &mark, 'D', off, off, 0);
+ if (ret != 0) goto abort;
+ off++;
+ }
+ continue;
+ }
+
+ off = tmp;
+ continue;
+ }
+
+ /* A potential code span start/end. */
+ if(ch == '`') {
+ OFF opener_beg, opener_end;
+ OFF closer_beg, closer_end;
+ int is_code_span;
+
+ is_code_span = md_is_code_span(ctx, lines + i, n_lines - i, off,
+ &opener_beg, &opener_end, &closer_beg, &closer_end,
+ codespan_last_potential_closers.ptr,
+ &codespan_scanned_till_paragraph_end);
+ if(is_code_span) {
+ ret = PUSH_MARK(ctx, &mark, '`', opener_beg, opener_end, MD_MARK_OPENER | MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ ret = PUSH_MARK(ctx, &mark, '`', closer_beg, closer_end, MD_MARK_CLOSER | MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ ctx.marks[ctx.n_marks-2].next = ctx.n_marks-1;
+ ctx.marks[ctx.n_marks-1].prev = ctx.n_marks-2;
+
+ off = closer_end;
+
+ /* Advance the current line accordingly. */
+ while(off > line_end) {
+ i++;
+ line++;
+ line_end = line.end;
+ }
+ continue;
+ }
+
+ off = opener_end;
+ continue;
+ }
+
+ /* A potential entity start. */
+ if(ch == '&') {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+1, MD_MARK_POTENTIAL_OPENER);
+ if (ret != 0) goto abort;
+ off++;
+ continue;
+ }
+
+ /* A potential entity end. */
+ if(ch == ';') {
+ /* We surely cannot be entity unless the previous mark is '&'. */
+ if(ctx.n_marks > 0 && ctx.marks[ctx.n_marks-1].ch == '&')
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+1, MD_MARK_POTENTIAL_CLOSER);
+ if (ret != 0) goto abort;
+ }
+
+ off++;
+ continue;
+ }
+
+ /* A potential autolink or raw HTML start/end. */
+ if(ch == '<') {
+ int is_autolink;
+ OFF autolink_end;
+ int missing_mailto;
+
+ if(!(ctx.parser.flags & MD_FLAG_NOHTMLSPANS)) {
+ int is_html;
+ OFF html_end;
+
+ /* Given the nature of the raw HTML, we have to recognize
+ * it here. Doing so later in md_analyze_lt_gt() could
+ * open can of worms of quadratic complexity. */
+ is_html = md_is_html_any(ctx, lines + i, n_lines - i, off,
+ lines[n_lines-1].end, &html_end);
+ if(is_html) {
+ ret = PUSH_MARK(ctx, &mark, '<', off, off, MD_MARK_OPENER | MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ ret = PUSH_MARK(ctx, &mark, '>', html_end, html_end, MD_MARK_CLOSER | MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ ctx.marks[ctx.n_marks-2].next = ctx.n_marks-1;
+ ctx.marks[ctx.n_marks-1].prev = ctx.n_marks-2;
+ off = html_end;
+
+ /* Advance the current line accordingly. */
+ while(off > line_end) {
+ i++;
+ line++;
+ line_end = line.end;
+ }
+ continue;
+ }
+ }
+
+ is_autolink = md_is_autolink(ctx, off, lines[n_lines-1].end,
+ &autolink_end, &missing_mailto);
+ if(is_autolink) {
+ ret = PUSH_MARK(ctx, &mark, (missing_mailto ? '@' : '<'), off, off+1,
+ MD_MARK_OPENER | MD_MARK_RESOLVED | MD_MARK_AUTOLINK);
+ if (ret != 0) goto abort;
+ ret = PUSH_MARK(ctx, &mark, '>', autolink_end-1, autolink_end,
+ MD_MARK_CLOSER | MD_MARK_RESOLVED | MD_MARK_AUTOLINK);
+ if (ret != 0) goto abort;
+ ctx.marks[ctx.n_marks-2].next = ctx.n_marks-1;
+ ctx.marks[ctx.n_marks-1].prev = ctx.n_marks-2;
+ off = autolink_end;
+ continue;
+ }
+
+ off++;
+ continue;
+ }
+
+ /* A potential link or its part. */
+ if(ch == '[' || (ch == '!' && off+1 < line_end && ctx.CH(off+1) == '[')) {
+ OFF tmp = (ch == '[' ? off+1 : off+2);
+ ret = PUSH_MARK(ctx, &mark, ch, off, tmp, MD_MARK_POTENTIAL_OPENER);
+ if (ret != 0) goto abort;
+ off = tmp;
+ /* Two dummies to make enough place for data we need if it is
+ * a link. */
+ ret = PUSH_MARK(ctx, &mark, 'D', off, off, 0);
+ if (ret != 0) goto abort;
+ ret = PUSH_MARK(ctx, &mark, 'D', off, off, 0);
+ if (ret != 0) goto abort;
+ continue;
+ }
+ if(ch == ']') {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+1, MD_MARK_POTENTIAL_CLOSER);
+ if (ret != 0) goto abort;
+ off++;
+ continue;
+ }
+
+ /* A potential permissive e-mail autolink. */
+ if(ch == '@') {
+ if(line.beg + 1 <= off && ctx.ISALNUM(off-1) &&
+ off + 3 < line.end && ctx.ISALNUM(off+1))
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+1, MD_MARK_POTENTIAL_OPENER);
+ if (ret != 0) goto abort;
+ /* Push a dummy as a reserve for a closer. */
+ ret = PUSH_MARK(ctx, &mark, 'D', off, off, 0);
+ if (ret != 0) goto abort;
+ }
+
+ off++;
+ continue;
+ }
+
+ /* A potential permissive URL autolink. */
+ if(ch == ':')
+ {
+ static struct Scheme
+ {
+ const(CHAR)* scheme;
+ SZ scheme_size;
+ const(CHAR)* suffix;
+ SZ suffix_size;
+ }
+
+ static immutable Scheme[] scheme_map =
+ [
+ Scheme("http", 4, "//", 2),
+ Scheme("https", 5, "//", 2),
+ Scheme("ftp", 3, "//", 2)
+ ];
+
+ int scheme_index;
+
+ for(scheme_index = 0; scheme_index < cast(int) (scheme_map.length); scheme_index++) {
+ const(CHAR)* scheme = scheme_map[scheme_index].scheme;
+ const SZ scheme_size = scheme_map[scheme_index].scheme_size;
+ const(CHAR)* suffix = scheme_map[scheme_index].suffix;
+ const SZ suffix_size = scheme_map[scheme_index].suffix_size;
+
+ if(line.beg + scheme_size <= off && md_ascii_eq(ctx.STR(off-scheme_size), scheme, scheme_size) &&
+ (line.beg + scheme_size == off || ctx.ISWHITESPACE(off-scheme_size-1) || ctx.ISANYOF(off-scheme_size-1, "*_~([")) &&
+ off + 1 + suffix_size < line.end && md_ascii_eq(ctx.STR(off+1), suffix, suffix_size))
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off-scheme_size, off+1+suffix_size, MD_MARK_POTENTIAL_OPENER);
+ if (ret != 0) goto abort;
+ /* Push a dummy as a reserve for a closer. */
+ ret = PUSH_MARK(ctx, &mark, 'D', off, off, 0);
+ if (ret != 0) goto abort;
+ off += 1 + suffix_size;
+ continue;
+ }
+ }
+
+ off++;
+ continue;
+ }
+
+ /* A potential permissive WWW autolink. */
+ if(ch == '.') {
+ if(line.beg + 3 <= off && md_ascii_eq(ctx.STR(off-3), "www", 3) &&
+ (line.beg + 3 == off || ctx.ISWHITESPACE(off-4) || ctx.ISANYOF(off-4, "*_~([")) &&
+ off + 1 < line_end)
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off-3, off+1, MD_MARK_POTENTIAL_OPENER);
+ if (ret != 0) goto abort;
+ /* Push a dummy as a reserve for a closer. */
+ ret = PUSH_MARK(ctx, &mark, 'D', off, off, 0);
+ if (ret != 0) goto abort;
+ off++;
+ continue;
+ }
+
+ off++;
+ continue;
+ }
+
+ /* A potential table cell boundary. */
+ if(table_mode && ch == '|') {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+1, 0);
+ if (ret != 0) goto abort;
+ off++;
+ continue;
+ }
+
+ /* A potential strikethrough start/end. */
+ if(ch == '~') {
+ OFF tmp = off+1;
+
+ while(tmp < line_end && ctx.CH(tmp) == '~')
+ tmp++;
+
+ ret = PUSH_MARK(ctx, &mark, ch, off, tmp, MD_MARK_POTENTIAL_OPENER | MD_MARK_POTENTIAL_CLOSER);
+ if (ret != 0) goto abort;
+ off = tmp;
+ continue;
+ }
+
+ /* A potential equation start/end */
+ if(ch == '$') {
+ /* We can have at most two consecutive $ signs,
+ * where two dollar signs signify a display equation. */
+ OFF tmp = off+1;
+
+ while(tmp < line_end && ctx.CH(tmp) == '$')
+ tmp++;
+
+ if (tmp - off <= 2)
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off, tmp, MD_MARK_POTENTIAL_OPENER | MD_MARK_POTENTIAL_CLOSER);
+ if (ret != 0) goto abort;
+ }
+ off = tmp;
+ continue;
+ }
+
+ /* Turn non-trivial whitespace into single space. */
+ if(ISWHITESPACE_(ch)) {
+ OFF tmp = off+1;
+
+ while(tmp < line_end && ctx.ISWHITESPACE(tmp))
+ tmp++;
+
+ if(tmp - off > 1 || ch != ' ')
+ {
+ ret = PUSH_MARK(ctx, &mark, ch, off, tmp, MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ }
+
+ off = tmp;
+ continue;
+ }
+
+ /* null character. */
+ if(ch == '\0') {
+ ret = PUSH_MARK(ctx, &mark, ch, off, off+1, MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+ off++;
+ continue;
+ }
+
+ off++;
+ }
+ }
+
+ /* Add a dummy mark at the end of the mark vector to simplify
+ * process_inlines(). */
+ ret = PUSH_MARK(ctx, &mark, 127, ctx.size, ctx.size, MD_MARK_RESOLVED);
+ if (ret != 0) goto abort;
+
+abort:
+ return ret;
+}
+
+static void
+md_analyze_bracket(MD_CTX* ctx, int mark_index)
+{
+ /* We cannot really resolve links here as for that we would need
+ * more context. E.g. a following pair of brackets (reference link),
+ * or enclosing pair of brackets (if the inner is the link, the outer
+ * one cannot be.)
+ *
+ * Therefore we here only construct a list of resolved '[' ']' pairs
+ * ordered by position of the closer. This allows ur to analyze what is
+ * or is not link in the right order, from inside to outside in case
+ * of nested brackets.
+ *
+ * The resolving itself is deferred into md_resolve_links().
+ */
+
+ MD_MARK* mark = &ctx.marks[mark_index];
+
+ if(mark.flags & MD_MARK_POTENTIAL_OPENER) {
+ md_mark_chain_append(ctx, ctx.BRACKET_OPENERS, mark_index);
+ return;
+ }
+
+ if(ctx.BRACKET_OPENERS.tail >= 0) {
+ /* Pop the opener from the chain. */
+ int opener_index = ctx.BRACKET_OPENERS.tail;
+ MD_MARK* opener = &ctx.marks[opener_index];
+ if(opener.prev >= 0)
+ ctx.marks[opener.prev].next = -1;
+ else
+ ctx.BRACKET_OPENERS.head = -1;
+ ctx.BRACKET_OPENERS.tail = opener.prev;
+
+ /* Interconnect the opener and closer. */
+ opener.next = mark_index;
+ mark.prev = opener_index;
+
+ /* Add the pair into chain of potential links for md_resolve_links().
+ * Note we misuse opener.prev for this as opener.next points to its
+ * closer. */
+ if(ctx.unresolved_link_tail >= 0)
+ ctx.marks[ctx.unresolved_link_tail].prev = opener_index;
+ else
+ ctx.unresolved_link_head = opener_index;
+ ctx.unresolved_link_tail = opener_index;
+ opener.prev = -1;
+ }
+}
+
+/* Forward declaration. */
+static void md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
+ int mark_beg, int mark_end);
+
+static int
+md_resolve_links(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
+{
+ int opener_index = ctx.unresolved_link_head;
+ OFF last_link_beg = 0;
+ OFF last_link_end = 0;
+ OFF last_img_beg = 0;
+ OFF last_img_end = 0;
+
+ while(opener_index >= 0) {
+ MD_MARK* opener = &ctx.marks[opener_index];
+ int closer_index = opener.next;
+ MD_MARK* closer = &ctx.marks[closer_index];
+ int next_index = opener.prev;
+ MD_MARK* next_opener;
+ MD_MARK* next_closer;
+ MD_LINK_ATTR attr;
+ int is_link = FALSE;
+
+ if(next_index >= 0) {
+ next_opener = &ctx.marks[next_index];
+ next_closer = &ctx.marks[next_opener.next];
+ } else {
+ next_opener = null;
+ next_closer = null;
+ }
+
+ /* If nested ("[ [ ] ]"), we need to make sure that:
+ * - The outer does not end inside of (...) belonging to the inner.
+ * - The outer cannot be link if the inner is link (i.e. not image).
+ *
+ * (Note we here analyze from inner to outer as the marks are ordered
+ * by closer.beg.)
+ */
+ if((opener.beg < last_link_beg && closer.end < last_link_end) ||
+ (opener.beg < last_img_beg && closer.end < last_img_end) ||
+ (opener.beg < last_link_end && opener.ch == '['))
+ {
+ opener_index = next_index;
+ continue;
+ }
+
+ if(next_opener != null && next_opener.beg == closer.end) {
+ if(next_closer.beg > closer.end + 1) {
+ /* Might be full reference link. */
+ is_link = md_is_link_reference(ctx, lines, n_lines, next_opener.beg, next_closer.end, &attr);
+ } else {
+ /* Might be shortcut reference link. */
+ is_link = md_is_link_reference(ctx, lines, n_lines, opener.beg, closer.end, &attr);
+ }
+
+ if(is_link < 0)
+ return -1;
+
+ if(is_link) {
+ /* Eat the 2nd "[...]". */
+ closer.end = next_closer.end;
+ }
+ } else {
+ if(closer.end < ctx.size && ctx.CH(closer.end) == '(') {
+ /* Might be inline link. */
+ OFF inline_link_end = uint.max;
+
+ is_link = md_is_inline_link_spec(ctx, lines, n_lines, closer.end, &inline_link_end, &attr);
+ if(is_link < 0)
+ return -1;
+
+ /* Check the closing ')' is not inside an already resolved range
+ * (i.e. a range with a higher priority), e.g. a code span. */
+ if(is_link) {
+ int i = closer_index + 1;
+
+ while(i < ctx.n_marks) {
+ MD_MARK* mark = &ctx.marks[i];
+
+ if(mark.beg >= inline_link_end)
+ break;
+ if((mark.flags & (MD_MARK_OPENER | MD_MARK_RESOLVED)) == (MD_MARK_OPENER | MD_MARK_RESOLVED)) {
+ if(ctx.marks[mark.next].beg >= inline_link_end) {
+ /* Cancel the link status. */
+ if(attr.title_needs_free)
+ free(cast(void*)(attr.title));
+ is_link = FALSE;
+ break;
+ }
+
+ i = mark.next + 1;
+ } else {
+ i++;
+ }
+ }
+ }
+
+ if(is_link) {
+ /* Eat the "(...)" */
+ closer.end = inline_link_end;
+ }
+ }
+
+ if(!is_link) {
+ /* Might be collapsed reference link. */
+ is_link = md_is_link_reference(ctx, lines, n_lines, opener.beg, closer.end, &attr);
+ if(is_link < 0)
+ return -1;
+ }
+ }
+
+ if(is_link) {
+ /* Resolve the brackets as a link. */
+ opener.flags |= MD_MARK_OPENER | MD_MARK_RESOLVED;
+ closer.flags |= MD_MARK_CLOSER | MD_MARK_RESOLVED;
+
+ /* If it is a link, we store the destination and title in the two
+ * dummy marks after the opener. */
+ assert(ctx.marks[opener_index+1].ch == 'D');
+ ctx.marks[opener_index+1].beg = attr.dest_beg;
+ ctx.marks[opener_index+1].end = attr.dest_end;
+
+ assert(ctx.marks[opener_index+2].ch == 'D');
+ md_mark_store_ptr(ctx, opener_index+2, attr.title);
+ if(attr.title_needs_free)
+ md_mark_chain_append(ctx, ctx.PTR_CHAIN, opener_index+2);
+ ctx.marks[opener_index+2].prev = attr.title_size;
+
+ if(opener.ch == '[') {
+ last_link_beg = opener.beg;
+ last_link_end = closer.end;
+ } else {
+ last_img_beg = opener.beg;
+ last_img_end = closer.end;
+ }
+
+ md_analyze_link_contents(ctx, lines, n_lines, opener_index+1, closer_index);
+ }
+
+ opener_index = next_index;
+ }
+
+ return 0;
+}
+
+/* Analyze whether the mark '&' starts a HTML entity.
+ * If so, update its flags as well as flags of corresponding closer ';'. */
+static void
+md_analyze_entity(MD_CTX* ctx, int mark_index)
+{
+ MD_MARK* opener = &ctx.marks[mark_index];
+ MD_MARK* closer;
+ OFF off;
+
+ /* Cannot be entity if there is no closer as the next mark.
+ * (Any other mark between would mean strange character which cannot be
+ * part of the entity.
+ *
+ * So we can do all the work on '&' and do not call this later for the
+ * closing mark ';'.
+ */
+ if(mark_index + 1 >= ctx.n_marks)
+ return;
+ closer = &ctx.marks[mark_index+1];
+ if(closer.ch != ';')
+ return;
+
+ if(md_is_entity(ctx, opener.beg, closer.end, &off)) {
+ assert(off == closer.end);
+
+ md_resolve_range(ctx, null, mark_index, mark_index+1);
+ opener.end = closer.end;
+ }
+}
+
+static void
+md_analyze_table_cell_boundary(MD_CTX* ctx, int mark_index)
+{
+ MD_MARK* mark = &ctx.marks[mark_index];
+ mark.flags |= MD_MARK_RESOLVED;
+
+ md_mark_chain_append(ctx, ctx.TABLECELLBOUNDARIES, mark_index);
+ ctx.n_table_cell_boundaries++;
+}
+
+/* Split a longer mark into two. The new mark takes the given count of
+ * characters. May only be called if an adequate number of dummy 'D' marks
+ * follows.
+ */
+static int
+md_split_emph_mark(MD_CTX* ctx, int mark_index, SZ n)
+{
+ MD_MARK* mark = &ctx.marks[mark_index];
+ int new_mark_index = mark_index + (mark.end - mark.beg - n);
+ MD_MARK* dummy = &ctx.marks[new_mark_index];
+
+ assert(mark.end - mark.beg > n);
+ assert(dummy.ch == 'D');
+
+ memcpy(dummy, mark, MD_MARK.sizeof);
+ mark.end -= n;
+ dummy.beg = mark.end;
+
+ return new_mark_index;
+}
+
+static void
+md_analyze_emph(MD_CTX* ctx, int mark_index)
+{
+ MD_MARK* mark = &ctx.marks[mark_index];
+ MD_MARKCHAIN* chain = md_mark_chain(ctx, mark_index);
+
+ /* If we can be a closer, try to resolve with the preceding opener. */
+ if(mark.flags & MD_MARK_POTENTIAL_CLOSER) {
+ MD_MARK* opener = null;
+ int opener_index;
+
+ if(mark.ch == '*') {
+ MD_MARKCHAIN*[6] opener_chains;
+ int i, n_opener_chains;
+ uint flags = mark.flags;
+
+ /* Apply "rule of three". (This is why we break asterisk opener
+ * marks into multiple chains.) */
+ n_opener_chains = 0;
+ opener_chains[n_opener_chains++] = ctx.ASTERISK_OPENERS_intraword_mod3_0;
+ if((flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_2)
+ opener_chains[n_opener_chains++] = ctx.ASTERISK_OPENERS_intraword_mod3_1;
+ if((flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_1)
+ opener_chains[n_opener_chains++] = ctx.ASTERISK_OPENERS_intraword_mod3_2;
+ opener_chains[n_opener_chains++] = ctx.ASTERISK_OPENERS_extraword_mod3_0;
+ if(!(flags & MD_MARK_EMPH_INTRAWORD) || (flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_2)
+ opener_chains[n_opener_chains++] = ctx.ASTERISK_OPENERS_extraword_mod3_1;
+ if(!(flags & MD_MARK_EMPH_INTRAWORD) || (flags & MD_MARK_EMPH_MOD3_MASK) != MD_MARK_EMPH_MOD3_1)
+ opener_chains[n_opener_chains++] = ctx.ASTERISK_OPENERS_extraword_mod3_2;
+
+ /* Opener is the most recent mark from the allowed chains. */
+ for(i = 0; i < n_opener_chains; i++) {
+ if(opener_chains[i].tail >= 0) {
+ int tmp_index = opener_chains[i].tail;
+ MD_MARK* tmp_mark = &ctx.marks[tmp_index];
+ if(opener == null || tmp_mark.end > opener.end) {
+ opener_index = tmp_index;
+ opener = tmp_mark;
+ }
+ }
+ }
+ } else {
+ /* Simple emph. mark */
+ if(chain.tail >= 0) {
+ opener_index = chain.tail;
+ opener = &ctx.marks[opener_index];
+ }
+ }
+
+ /* Resolve, if we have found matching opener. */
+ if(opener != null) {
+ SZ opener_size = opener.end - opener.beg;
+ SZ closer_size = mark.end - mark.beg;
+
+ if(opener_size > closer_size) {
+ opener_index = md_split_emph_mark(ctx, opener_index, closer_size);
+ md_mark_chain_append(ctx, md_mark_chain(ctx, opener_index), opener_index);
+ } else if(opener_size < closer_size) {
+ md_split_emph_mark(ctx, mark_index, closer_size - opener_size);
+ }
+
+ md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING);
+ md_resolve_range(ctx, chain, opener_index, mark_index);
+ return;
+ }
+ }
+
+ /* If we could not resolve as closer, we may be yet be an opener. */
+ if(mark.flags & MD_MARK_POTENTIAL_OPENER)
+ md_mark_chain_append(ctx, chain, mark_index);
+}
+
+static void
+md_analyze_tilde(MD_CTX* ctx, int mark_index)
+{
+ /* We attempt to be Github Flavored Markdown compatible here. GFM says
+ * that length of the tilde sequence is not important at all. Note that
+ * implies the ctx.TILDE_OPENERS chain can have at most one item. */
+
+ if(ctx.TILDE_OPENERS.head >= 0) {
+ /* The chain already contains an opener, so we may resolve the span. */
+ int opener_index = ctx.TILDE_OPENERS.head;
+
+ md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_CROSSING);
+ md_resolve_range(ctx, ctx.TILDE_OPENERS, opener_index, mark_index);
+ } else {
+ /* We can only be opener. */
+ md_mark_chain_append(ctx, ctx.TILDE_OPENERS, mark_index);
+ }
+}
+
+static void
+md_analyze_dollar(MD_CTX* ctx, int mark_index)
+{
+ /* This should mimic the way inline equations work in LaTeX, so there
+ * can only ever be one item in the chain (i.e. the dollars can't be
+ * nested). This is basically the same as the md_analyze_tilde function,
+ * except that we require matching openers and closers to be of the same
+ * length.
+ *
+ * E.g.: $abc$$def$$ => abc (display equation) def (end equation) */
+ if(ctx.DOLLAR_OPENERS.head >= 0) {
+ /* If the potential closer has a non-matching number of $, discard */
+ MD_MARK* open = &ctx.marks[ctx.DOLLAR_OPENERS.head];
+ MD_MARK* close = &ctx.marks[mark_index];
+
+ int opener_index = ctx.DOLLAR_OPENERS.head;
+ md_rollback(ctx, opener_index, mark_index, MD_ROLLBACK_ALL);
+ if (open.end - open.beg == close.end - close.beg) {
+ /* We are the matching closer */
+ md_resolve_range(ctx, ctx.DOLLAR_OPENERS, opener_index, mark_index);
+ } else {
+ /* We don't match the opener, so discard old opener and insert as opener */
+ md_mark_chain_append(ctx, ctx.DOLLAR_OPENERS, mark_index);
+ }
+ } else {
+ /* No unmatched openers, so we are opener */
+ md_mark_chain_append(ctx, ctx.DOLLAR_OPENERS, mark_index);
+ }
+}
+
+static void
+md_analyze_permissive_url_autolink(MD_CTX* ctx, int mark_index)
+{
+ MD_MARK* opener = &ctx.marks[mark_index];
+ int closer_index = mark_index + 1;
+ MD_MARK* closer = &ctx.marks[closer_index];
+ MD_MARK* next_resolved_mark;
+ OFF off = opener.end;
+ int n_dots = FALSE;
+ int has_underscore_in_last_seg = FALSE;
+ int has_underscore_in_next_to_last_seg = FALSE;
+ int n_opened_parenthesis = 0;
+
+ /* Check for domain. */
+ while(off < ctx.size) {
+ if(ctx.ISALNUM(off) || ctx.CH(off) == '-') {
+ off++;
+ } else if(ctx.CH(off) == '.') {
+ /* We must see at least one period. */
+ n_dots++;
+ has_underscore_in_next_to_last_seg = has_underscore_in_last_seg;
+ has_underscore_in_last_seg = FALSE;
+ off++;
+ } else if(ctx.CH(off) == '_') {
+ /* No underscore may be present in the last two domain segments. */
+ has_underscore_in_last_seg = TRUE;
+ off++;
+ } else {
+ break;
+ }
+ }
+ if(off > opener.end && ctx.CH(off-1) == '.') {
+ off--;
+ n_dots--;
+ }
+ if(off <= opener.end || n_dots == 0 || has_underscore_in_next_to_last_seg || has_underscore_in_last_seg)
+ return;
+
+ /* Check for path. */
+ next_resolved_mark = closer + 1;
+ while(next_resolved_mark.ch == 'D' || !(next_resolved_mark.flags & MD_MARK_RESOLVED))
+ next_resolved_mark++;
+ while(off < next_resolved_mark.beg && ctx.CH(off) != '<' && !ctx.ISWHITESPACE(off) && !ctx.ISNEWLINE(off)) {
+ /* Parenthesis must be balanced. */
+ if(ctx.CH(off) == '(') {
+ n_opened_parenthesis++;
+ } else if(ctx.CH(off) == ')') {
+ if(n_opened_parenthesis > 0)
+ n_opened_parenthesis--;
+ else
+ break;
+ }
+
+ off++;
+ }
+ /* These cannot be last char In such case they are more likely normal
+ * punctuation. */
+ if(ctx.ISANYOF(off-1, "?!.,:*_~"))
+ off--;
+
+ /* Ok. Lets call it auto-link. Adapt opener and create closer to zero
+ * length so all the contents becomes the link text. */
+ assert(closer.ch == 'D');
+ opener.end = opener.beg;
+ closer.ch = opener.ch;
+ closer.beg = off;
+ closer.end = off;
+ md_resolve_range(ctx, null, mark_index, closer_index);
+}
+
+/* The permissive autolinks do not have to be enclosed in '<' '>' but we
+ * instead impose stricter rules what is understood as an e-mail address
+ * here. Actually any non-alphanumeric characters with exception of '.'
+ * are prohibited both in username and after '@'. */
+static void
+md_analyze_permissive_email_autolink(MD_CTX* ctx, int mark_index)
+{
+ MD_MARK* opener = &ctx.marks[mark_index];
+ int closer_index;
+ MD_MARK* closer;
+ OFF beg = opener.beg;
+ OFF end = opener.end;
+ int dot_count = 0;
+
+ assert(ctx.CH(beg) == '@');
+
+ /* Scan for name before '@'. */
+ while(beg > 0 && (ctx.ISALNUM(beg-1) || ctx.ISANYOF(beg-1, ".-_+")))
+ beg--;
+
+ /* Scan for domain after '@'. */
+ while(end < ctx.size && (ctx.ISALNUM(end) || ctx.ISANYOF(end, ".-_"))) {
+ if(ctx.CH(end) == '.')
+ dot_count++;
+ end++;
+ }
+ if(ctx.CH(end-1) == '.') { /* Final '.' not part of it. */
+ dot_count--;
+ end--;
+ }
+ else if(ctx.ISANYOF2(end-1, '-', '_')) /* These are forbidden at the end. */
+ return;
+ if(ctx.CH(end-1) == '@' || dot_count == 0)
+ return;
+
+ /* Ok. Lets call it auto-link. Adapt opener and create closer to zero
+ * length so all the contents becomes the link text. */
+ closer_index = mark_index + 1;
+ closer = &ctx.marks[closer_index];
+ assert(closer.ch == 'D');
+
+ opener.beg = beg;
+ opener.end = beg;
+ closer.ch = opener.ch;
+ closer.beg = end;
+ closer.end = end;
+ md_resolve_range(ctx, null, mark_index, closer_index);
+}
+
+static void
+md_analyze_marks(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
+ int mark_beg, int mark_end, const(CHAR)* mark_chars)
+{
+ int i = mark_beg;
+
+ while(i < mark_end) {
+ MD_MARK* mark = &ctx.marks[i];
+
+ /* Skip resolved spans. */
+ if(mark.flags & MD_MARK_RESOLVED) {
+ if(mark.flags & MD_MARK_OPENER) {
+ assert(i < mark.next);
+ i = mark.next + 1;
+ } else {
+ i++;
+ }
+ continue;
+ }
+
+ /* Skip marks we do not want to deal with. */
+ if(!ISANYOF_(mark.ch, mark_chars)) {
+ i++;
+ continue;
+ }
+
+ /* Analyze the mark. */
+ switch(mark.ch) {
+ case '[': /* Pass through. */
+ case '!': /* Pass through. */
+ case ']': md_analyze_bracket(ctx, i); break;
+ case '&': md_analyze_entity(ctx, i); break;
+ case '|': md_analyze_table_cell_boundary(ctx, i); break;
+ case '_': /* Pass through. */
+ case '*': md_analyze_emph(ctx, i); break;
+ case '~': md_analyze_tilde(ctx, i); break;
+ case '$': md_analyze_dollar(ctx, i); break;
+ case '.': /* Pass through. */
+ case ':': md_analyze_permissive_url_autolink(ctx, i); break;
+ case '@': md_analyze_permissive_email_autolink(ctx, i); break;
+ default: break;
+ }
+
+ i++;
+ }
+}
+
+/* Analyze marks (build ctx.marks). */
+static int
+md_analyze_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines, int table_mode)
+{
+ int ret;
+
+ /* Reset the previously collected stack of marks. */
+ ctx.n_marks = 0;
+
+ /* Collect all marks. */
+ ret = (md_collect_marks(ctx, lines, n_lines, table_mode));
+ if (ret < 0) goto abort;
+
+ /* We analyze marks in few groups to handle their precedence. */
+ /* (1) Entities; code spans; autolinks; raw HTML. */
+ md_analyze_marks(ctx, lines, n_lines, 0, ctx.n_marks, "&");
+
+ if(table_mode) {
+ /* (2) Analyze table cell boundaries.
+ * Note we reset ctx.TABLECELLBOUNDARIES chain prior to the call md_analyze_marks(),
+ * not after, because caller may need it. */
+ assert(n_lines == 1);
+ ctx.TABLECELLBOUNDARIES.head = -1;
+ ctx.TABLECELLBOUNDARIES.tail = -1;
+ ctx.n_table_cell_boundaries = 0;
+ md_analyze_marks(ctx, lines, n_lines, 0, ctx.n_marks, "|");
+ return ret;
+ }
+
+ /* (3) Links. */
+ md_analyze_marks(ctx, lines, n_lines, 0, ctx.n_marks, "[]!");
+ ret = (md_resolve_links(ctx, lines, n_lines));
+ if (ret < 0) goto abort;
+ ctx.BRACKET_OPENERS.head = -1;
+ ctx.BRACKET_OPENERS.tail = -1;
+ ctx.unresolved_link_head = -1;
+ ctx.unresolved_link_tail = -1;
+
+ /* (4) Emphasis and strong emphasis; permissive autolinks. */
+ md_analyze_link_contents(ctx, lines, n_lines, 0, ctx.n_marks);
+
+abort:
+ return ret;
+}
+
+static void
+md_analyze_link_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines,
+ int mark_beg, int mark_end)
+{
+ md_analyze_marks(ctx, lines, n_lines, mark_beg, mark_end, "*_~$@:.");
+ ctx.ASTERISK_OPENERS_extraword_mod3_0.head = -1;
+ ctx.ASTERISK_OPENERS_extraword_mod3_0.tail = -1;
+ ctx.ASTERISK_OPENERS_extraword_mod3_1.head = -1;
+ ctx.ASTERISK_OPENERS_extraword_mod3_1.tail = -1;
+ ctx.ASTERISK_OPENERS_extraword_mod3_2.head = -1;
+ ctx.ASTERISK_OPENERS_extraword_mod3_2.tail = -1;
+ ctx.ASTERISK_OPENERS_intraword_mod3_0.head = -1;
+ ctx.ASTERISK_OPENERS_intraword_mod3_0.tail = -1;
+ ctx.ASTERISK_OPENERS_intraword_mod3_1.head = -1;
+ ctx.ASTERISK_OPENERS_intraword_mod3_1.tail = -1;
+ ctx.ASTERISK_OPENERS_intraword_mod3_2.head = -1;
+ ctx.ASTERISK_OPENERS_intraword_mod3_2.tail = -1;
+ ctx.UNDERSCORE_OPENERS.head = -1;
+ ctx.UNDERSCORE_OPENERS.tail = -1;
+ ctx.TILDE_OPENERS.head = -1;
+ ctx.TILDE_OPENERS.tail = -1;
+ ctx.DOLLAR_OPENERS.head = -1;
+ ctx.DOLLAR_OPENERS.tail = -1;
+}
+
+static int
+md_enter_leave_span_a(MD_CTX* ctx, int enter, MD_SPANTYPE type,
+ const(CHAR)* dest, SZ dest_size, int prohibit_escapes_in_dest,
+ const(CHAR)* title, SZ title_size)
+{
+ MD_ATTRIBUTE_BUILD href_build = MD_ATTRIBUTE_BUILD.init;
+ MD_ATTRIBUTE_BUILD title_build = MD_ATTRIBUTE_BUILD.init;
+ MD_SPAN_A_DETAIL det;
+ int ret = 0;
+
+ /* Note we here rely on fact that MD_SPAN_A_DETAIL and
+ * MD_SPAN_IMG_DETAIL are binary-compatible. */
+ memset(&det, 0, MD_SPAN_A_DETAIL.sizeof);
+ ret = (md_build_attribute(ctx, dest, dest_size,
+ (prohibit_escapes_in_dest ? MD_BUILD_ATTR_NO_ESCAPES : 0),
+ &det.href, &href_build));
+ if (ret < 0) goto abort;
+ ret = (md_build_attribute(ctx, title, title_size, 0, &det.title, &title_build));
+ if (ret < 0) goto abort;
+
+ if(enter)
+ {
+ ret = MD_ENTER_SPAN(ctx, type, &det);
+ if (ret != 0) goto abort;
+ }
+ else
+ {
+ ret = MD_LEAVE_SPAN(ctx, type, &det);
+ if (ret != 0) goto abort;
+ }
+
+abort:
+ md_free_attribute(ctx, &href_build);
+ md_free_attribute(ctx, &title_build);
+ return ret;
+}
+
+/* Render the output, accordingly to the analyzed ctx.marks. */
+static int
+md_process_inlines(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
+{
+ MD_TEXTTYPE text_type;
+ const(MD_LINE)* line = lines;
+ MD_MARK* prev_mark = null;
+ MD_MARK* mark;
+ OFF off = lines[0].beg;
+ OFF end = lines[n_lines-1].end;
+ int enforce_hardbreak = 0;
+ int ret = 0;
+
+ /* Find first resolved mark. Note there is always at least one resolved
+ * mark, the dummy last one after the end of the latest line we actually
+ * never really reach. This saves us of a lot of special checks and cases
+ * in this function. */
+ mark = ctx.marks;
+ while(!(mark.flags & MD_MARK_RESOLVED))
+ mark++;
+
+ text_type = MD_TEXT_NORMAL;
+
+ while(1) {
+ /* Process the text up to the next mark or end-of-line. */
+ OFF tmp = (line.end < mark.beg ? line.end : mark.beg);
+ if(tmp > off) {
+ ret = MD_TEXT(ctx, text_type, ctx.STR(off), tmp - off);
+ if (ret != 0) goto abort;
+ off = tmp;
+ }
+
+ /* If reached the mark, process it and move to next one. */
+ if(off >= mark.beg) {
+ switch(mark.ch) {
+ case '\\': /* Backslash escape. */
+ if(ctx.ISNEWLINE(mark.beg+1))
+ enforce_hardbreak = 1;
+ else
+ {
+ ret = MD_TEXT(ctx, text_type, ctx.STR(mark.beg+1), 1);
+ if (ret != 0) goto abort;
+ }
+ break;
+
+ case ' ': /* Non-trivial space. */
+ ret = MD_TEXT(ctx, text_type, " ", 1);
+ if (ret != 0) goto abort;
+ break;
+
+ case '`': /* Code span. */
+ if(mark.flags & MD_MARK_OPENER) {
+ ret = MD_ENTER_SPAN(ctx, MD_SPAN_CODE, null);
+ if (ret != 0) goto abort;
+ text_type = MD_TEXT_CODE;
+ } else {
+ ret = MD_LEAVE_SPAN(ctx, MD_SPAN_CODE, null);
+ if (ret != 0) goto abort;
+ text_type = MD_TEXT_NORMAL;
+ }
+ break;
+
+ case '_':
+ case '*': /* Emphasis, strong emphasis. */
+ if(mark.flags & MD_MARK_OPENER) {
+ if((mark.end - off) % 2) {
+ ret = MD_ENTER_SPAN(ctx, MD_SPAN_EM, null);
+ if (ret != 0) goto abort;
+ off++;
+ }
+ while(off + 1 < mark.end) {
+ ret = MD_ENTER_SPAN(ctx, MD_SPAN_STRONG, null);
+ if (ret != 0) goto abort;
+ off += 2;
+ }
+ } else {
+ while(off + 1 < mark.end) {
+ ret = MD_LEAVE_SPAN(ctx, MD_SPAN_STRONG, null);
+ if (ret != 0) goto abort;
+ off += 2;
+ }
+ if((mark.end - off) % 2) {
+ ret = MD_LEAVE_SPAN(ctx, MD_SPAN_EM, null);
+ if (ret != 0) goto abort;
+ off++;
+ }
+ }
+ break;
+
+ case '~':
+ if(mark.flags & MD_MARK_OPENER)
+ {
+ ret = MD_ENTER_SPAN(ctx, MD_SPAN_DEL, null);
+ if (ret != 0) goto abort;
+ }
+ else
+ {
+ ret = MD_LEAVE_SPAN(ctx, MD_SPAN_DEL, null);
+ if (ret != 0) goto abort;
+ }
+ break;
+
+ case '$':
+ if(mark.flags & MD_MARK_OPENER) {
+ ret = MD_ENTER_SPAN(ctx, (mark.end - off) % 2 ? MD_SPAN_LATEXMATH : MD_SPAN_LATEXMATH_DISPLAY, null);
+ if (ret != 0) goto abort;
+ text_type = MD_TEXT_LATEXMATH;
+ } else {
+ ret = MD_LEAVE_SPAN(ctx, (mark.end - off) % 2 ? MD_SPAN_LATEXMATH : MD_SPAN_LATEXMATH_DISPLAY, null);
+ if (ret != 0) goto abort;
+ text_type = MD_TEXT_NORMAL;
+ }
+ break;
+
+ case '[': /* Link, image. */
+ case '!':
+ case ']':
+ {
+ const MD_MARK* opener = (mark.ch != ']' ? mark : &ctx.marks[mark.prev]);
+ const MD_MARK* dest_mark = opener+1;
+ const MD_MARK* title_mark = opener+2;
+
+ assert(dest_mark.ch == 'D');
+ assert(title_mark.ch == 'D');
+
+ ret = (md_enter_leave_span_a(ctx, (mark.ch != ']') ? 1 : 0,
+ (opener.ch == '!' ? MD_SPAN_IMG : MD_SPAN_A),
+ ctx.STR(dest_mark.beg), dest_mark.end - dest_mark.beg, FALSE,
+ cast(char*) md_mark_get_ptr(ctx, cast(int)(title_mark - ctx.marks)), title_mark.prev));
+ if (ret < 0) goto abort;
+
+ /* link/image closer may span multiple lines. */
+ if(mark.ch == ']') {
+ while(mark.end > line.end)
+ line++;
+ }
+
+ break;
+ }
+
+ case '<':
+ case '>': /* Autolink or raw HTML. */
+ if(!(mark.flags & MD_MARK_AUTOLINK)) {
+ /* Raw HTML. */
+ if(mark.flags & MD_MARK_OPENER)
+ text_type = MD_TEXT_HTML;
+ else
+ text_type = MD_TEXT_NORMAL;
+ break;
+ }
+ /* Pass through, if auto-link. */
+ goto case '.';
+
+ case '@': /* Permissive e-mail autolink. */
+ case ':': /* Permissive URL autolink. */
+ case '.': /* Permissive WWW autolink. */
+ {
+ MD_MARK* opener = ((mark.flags & MD_MARK_OPENER) ? mark : &ctx.marks[mark.prev]);
+ MD_MARK* closer = &ctx.marks[opener.next];
+ const(CHAR)* dest = ctx.STR(opener.end);
+ SZ dest_size = closer.beg - opener.end;
+
+ /* For permissive auto-links we do not know closer mark
+ * position at the time of md_collect_marks(), therefore
+ * it can be out-of-order in ctx.marks[].
+ *
+ * With this flag, we make sure that we output the closer
+ * only if we processed the opener. */
+ if(mark.flags & MD_MARK_OPENER)
+ closer.flags |= MD_MARK_VALIDPERMISSIVEAUTOLINK;
+
+ if(opener.ch == '@' || opener.ch == '.') {
+ dest_size += 7;
+ ret = MD_TEMP_BUFFER(ctx, dest_size * CHAR.sizeof);
+ if (ret < 0) goto abort;
+ memcpy(ctx.buffer,
+ (opener.ch == '@' ? "mailto:" : "http://").ptr,
+ 7 * CHAR.sizeof);
+ memcpy(ctx.buffer + 7, dest, (dest_size-7) * CHAR.sizeof);
+ dest = ctx.buffer;
+ }
+
+ if(closer.flags & MD_MARK_VALIDPERMISSIVEAUTOLINK)
+ {
+ ret = (md_enter_leave_span_a(ctx, (mark.flags & MD_MARK_OPENER),
+ MD_SPAN_A, dest, dest_size, TRUE, null, 0));
+ if (ret < 0) goto abort;
+ }
+ break;
+ }
+
+ case '&': /* Entity. */
+ ret = MD_TEXT(ctx, MD_TEXT_ENTITY, ctx.STR(mark.beg), mark.end - mark.beg);
+ if (ret != 0) goto abort;
+ break;
+
+ case '\0':
+ ret = MD_TEXT(ctx, MD_TEXT_NULLCHAR, "", 1);
+ if (ret != 0) goto abort;
+ break;
+
+ case 127:
+ goto abort;
+
+ default:
+ break;
+ }
+
+ off = mark.end;
+
+ /* Move to next resolved mark. */
+ prev_mark = mark;
+ mark++;
+ while(!(mark.flags & MD_MARK_RESOLVED) || mark.beg < off)
+ mark++;
+ }
+
+ /* If reached end of line, move to next one. */
+ if(off >= line.end) {
+ /* If it is the last line, we are done. */
+ if(off >= end)
+ break;
+
+ if(text_type == MD_TEXT_CODE || text_type == MD_TEXT_LATEXMATH) {
+ OFF tmp2;
+
+ assert(prev_mark != null);
+ assert(ISANYOF2_(prev_mark.ch, '`', '$') && (prev_mark.flags & MD_MARK_OPENER));
+ assert(ISANYOF2_(mark.ch, '`', '$') && (mark.flags & MD_MARK_CLOSER));
+
+ /* Inside a code span, trailing line whitespace has to be
+ * outputted. */
+ tmp2 = off;
+ while(off < ctx.size && ctx.ISBLANK(off))
+ off++;
+ if(off > tmp2)
+ {
+ ret = MD_TEXT(ctx, text_type, ctx.STR(tmp2), off-tmp2);
+ if (ret != 0) goto abort;
+ }
+
+ /* and new lines are transformed into single spaces. */
+ if(prev_mark.end < off && off < mark.beg)
+ {
+ ret = MD_TEXT(ctx, text_type, " ", 1);
+ if (ret != 0) goto abort;
+ }
+ } else if(text_type == MD_TEXT_HTML) {
+ /* Inside raw HTML, we output the new line verbatim, including
+ * any trailing spaces. */
+ OFF tmp2 = off;
+
+ while(tmp2 < end && ctx.ISBLANK(tmp2))
+ tmp2++;
+ if(tmp2 > off)
+ {
+ ret = MD_TEXT(ctx, MD_TEXT_HTML, ctx.STR(off), tmp2 - off);
+ if (ret != 0) goto abort;
+ }
+ ret = MD_TEXT(ctx, MD_TEXT_HTML, "\n", 1);
+ if (ret != 0) goto abort;
+ } else {
+ /* Output soft or hard line break. */
+ MD_TEXTTYPE break_type = MD_TEXT_SOFTBR;
+
+ if(text_type == MD_TEXT_NORMAL) {
+ if(enforce_hardbreak)
+ break_type = MD_TEXT_BR;
+ else if((ctx.CH(line.end) == ' ' && ctx.CH(line.end+1) == ' '))
+ break_type = MD_TEXT_BR;
+ }
+
+ ret = MD_TEXT(ctx, break_type, "\n", 1);
+ if (ret != 0) goto abort;
+ }
+
+ /* Move to the next line. */
+ line++;
+ off = line.beg;
+
+ enforce_hardbreak = 0;
+ }
+ }
+
+abort:
+ return ret;
+}
+
+
+/***************************
+ *** Processing Tables ***
+ ***************************/
+
+void md_analyze_table_alignment(MD_CTX* ctx, OFF beg, OFF end, MD_ALIGN* align_, int n_align)
+{
+ static immutable MD_ALIGN[] align_map =
+ [
+ MD_ALIGN_DEFAULT,
+ MD_ALIGN_LEFT,
+ MD_ALIGN_RIGHT,
+ MD_ALIGN_CENTER
+ ];
+ OFF off = beg;
+
+ while(n_align > 0) {
+ int index = 0; /* index into align_map[] */
+
+ while(ctx.CH(off) != '-')
+ off++;
+ if(off > beg && ctx.CH(off-1) == ':')
+ index |= 1;
+ while(off < end && ctx.CH(off) == '-')
+ off++;
+ if(off < end && ctx.CH(off) == ':')
+ index |= 2;
+
+ *align_ = align_map[index];
+ align_++;
+ n_align--;
+ }
+
+}
+
+int md_process_table_cell(MD_CTX* ctx, MD_BLOCKTYPE cell_type, MD_ALIGN align_, OFF beg, OFF end)
+{
+ MD_LINE line;
+ MD_BLOCK_TD_DETAIL det;
+ int ret = 0;
+
+ while(beg < end && ctx.ISWHITESPACE(beg))
+ beg++;
+ while(end > beg && ctx.ISWHITESPACE(end-1))
+ end--;
+
+ det.align_ = align_;
+ line.beg = beg;
+ line.end = end;
+
+ ret = MD_ENTER_BLOCK(ctx, cell_type, &det);
+ if (ret != 0) goto abort;
+ ret = (md_process_normal_block_contents(ctx, &line, 1));
+ if (ret < 0) goto abort;
+ ret = MD_LEAVE_BLOCK(ctx, cell_type, &det);
+ if (ret != 0) goto abort;
+
+abort:
+ return ret;
+}
+
+int md_process_table_row(MD_CTX* ctx, MD_BLOCKTYPE cell_type, OFF beg, OFF end,
+ const MD_ALIGN* align_, int col_count)
+{
+ MD_LINE line;
+ OFF* pipe_offs = null;
+ int i, j, n;
+ int ret = 0;
+
+ line.beg = beg;
+ line.end = end;
+
+ /* Break the line into table cells by identifying pipe characters who
+ * form the cell boundary. */
+ ret = (md_analyze_inlines(ctx, &line, 1, TRUE));
+ if (ret < 0) goto abort;
+
+ /* We have to remember the cell boundaries in local buffer because
+ * ctx.marks[] shall be reused during cell contents processing. */
+ n = ctx.n_table_cell_boundaries;
+ pipe_offs = cast(OFF*) malloc(n * OFF.sizeof);
+ if(pipe_offs == null) {
+ ctx.MD_LOG("malloc() failed.");
+ ret = -1;
+ goto abort;
+ }
+ for(i = ctx.TABLECELLBOUNDARIES.head, j = 0; i >= 0; i = ctx.marks[i].next) {
+ MD_MARK* mark = &ctx.marks[i];
+ pipe_offs[j++] = mark.beg;
+ }
+
+ /* Process cells. */
+ ret = MD_ENTER_BLOCK(ctx, MD_BLOCK_TR, null);
+ if (ret != 0) goto abort;
+
+ j = 0;
+ if(beg < pipe_offs[0] && j < col_count)
+ {
+ ret = (md_process_table_cell(ctx, cell_type, align_[j++], beg, pipe_offs[0]));
+ if (ret < 0) goto abort;
+ }
+ for(i = 0; i < n-1 && j < col_count; i++)
+ {
+ ret = (md_process_table_cell(ctx, cell_type, align_[j++], pipe_offs[i]+1, pipe_offs[i+1]));
+ if (ret < 0) goto abort;
+ }
+ if(pipe_offs[n-1] < end-1 && j < col_count)
+ {
+ ret = (md_process_table_cell(ctx, cell_type, align_[j++], pipe_offs[n-1]+1, end));
+ if (ret < 0) goto abort;
+ }
+ /* Make sure we call enough table cells even if the current table contains
+ * too few of them. */
+ while(j < col_count)
+ {
+ ret = (md_process_table_cell(ctx, cell_type, align_[j++], 0, 0));
+ if (ret < 0) goto abort;
+ }
+
+ ret = MD_LEAVE_BLOCK(ctx, MD_BLOCK_TR, null);
+ if (ret != 0) goto abort;
+
+abort:
+ free(pipe_offs);
+
+ /* Free any temporary memory blocks stored within some dummy marks. */
+ for(i = ctx.PTR_CHAIN.head; i >= 0; i = ctx.marks[i].next)
+ free(md_mark_get_ptr(ctx, i));
+ ctx.PTR_CHAIN.head = -1;
+ ctx.PTR_CHAIN.tail = -1;
+
+ return ret;
+}
+
+int md_process_table_block_contents(MD_CTX* ctx, int col_count, const MD_LINE* lines, int n_lines)
+{
+ MD_ALIGN* align_;
+ int i;
+ int ret = 0;
+
+ /* At least two lines have to be present: The column headers and the line
+ * with the underlines. */
+ assert(n_lines >= 2);
+
+ align_ = cast(MD_ALIGN*) malloc(col_count * MD_ALIGN.sizeof);
+ if(align_ == null) {
+ ctx.MD_LOG("malloc() failed.");
+ ret = -1;
+ goto abort;
+ }
+
+ md_analyze_table_alignment(ctx, lines[1].beg, lines[1].end, align_, col_count);
+
+ ret = MD_ENTER_BLOCK(ctx, MD_BLOCK_THEAD, null);
+ if (ret != 0) goto abort;
+ ret = (md_process_table_row(ctx, MD_BLOCK_TH,
+ lines[0].beg, lines[0].end, align_, col_count));
+ if (ret < 0) goto abort;
+ ret = MD_LEAVE_BLOCK(ctx, MD_BLOCK_THEAD, null);
+ if (ret != 0) goto abort;
+
+ ret = MD_ENTER_BLOCK(ctx, MD_BLOCK_TBODY, null);
+ if (ret != 0) goto abort;
+ for(i = 2; i < n_lines; i++) {
+ ret = (md_process_table_row(ctx, MD_BLOCK_TD,
+ lines[i].beg, lines[i].end, align_, col_count));
+ if (ret < 0) goto abort;
+ }
+ ret = MD_LEAVE_BLOCK(ctx, MD_BLOCK_TBODY, null);
+ if (ret != 0) goto abort;
+
+abort:
+ free(align_);
+ return ret;
+}
+
+int md_is_table_row(MD_CTX* ctx, OFF beg, OFF* p_end)
+{
+ MD_LINE line;
+ int i;
+ int ret = FALSE;
+
+ line.beg = beg;
+ line.end = beg;
+
+ /* Find end of line. */
+ while(line.end < ctx.size && !ctx.ISNEWLINE(line.end))
+ line.end++;
+
+ ret = (md_analyze_inlines(ctx, &line, 1, TRUE));
+ if (ret < 0) goto abort;
+
+ if(ctx.TABLECELLBOUNDARIES.head >= 0) {
+ if(p_end != null)
+ *p_end = line.end;
+ ret = TRUE;
+ }
+
+abort:
+ /* Free any temporary memory blocks stored within some dummy marks. */
+ for(i = ctx.PTR_CHAIN.head; i >= 0; i = ctx.marks[i].next)
+ free(md_mark_get_ptr(ctx, i));
+ ctx.PTR_CHAIN.head = -1;
+ ctx.PTR_CHAIN.tail = -1;
+
+ return ret;
+}
+
+
+/**************************
+ *** Processing Block ***
+ **************************/
+
+enum MD_BLOCK_CONTAINER_OPENER = 0x01;
+enum MD_BLOCK_CONTAINER_CLOSER = 0x02;
+enum MD_BLOCK_CONTAINER = (MD_BLOCK_CONTAINER_OPENER | MD_BLOCK_CONTAINER_CLOSER);
+enum MD_BLOCK_LOOSE_LIST = 0x04;
+enum MD_BLOCK_SETEXT_HEADER = 0x08;
+
+struct MD_BLOCK
+{
+nothrow:
+@nogc:
+ ubyte type_;
+ ubyte flags_;
+ ushort data_;
+
+ MD_BLOCKTYPE type() const { return type_; }
+ void type(MD_BLOCKTYPE value) { type_ = cast(ubyte)value; }
+
+ uint flags() const { return flags_; }
+ void flags(uint value) { flags_ = cast(ubyte)value; }
+
+ /* MD_BLOCK_H: Header level (1 - 6)
+ * MD_BLOCK_CODE: Non-zero if fenced, zero if indented.
+ * MD_BLOCK_LI: Task mark character (0 if not task list item, 'x', 'X' or ' ').
+ * MD_BLOCK_TABLE: Column count (as determined by the table underline).
+ */
+ uint data() const { return data_; }
+ void data(uint value) { data_ = cast(ubyte)value; }
+
+ /* Leaf blocks: Count of lines (MD_LINE or MD_VERBATIMLINE) on the block.
+ * MD_BLOCK_LI: Task mark offset in the input doc.
+ * MD_BLOCK_OL: Start item number.
+ */
+ uint n_lines;
+}
+
+static assert(MD_BLOCK.sizeof == 8);
+
+struct MD_CONTAINER
+{
+nothrow:
+@nogc:
+
+ CHAR ch;
+
+ ubyte is_loose_;
+ ubyte is_task_;
+
+ uint is_loose() { return is_loose_; }
+ void is_loose(uint value) { is_loose_ = cast(ubyte)value; }
+
+ uint is_task() { return is_task_; }
+ void is_task(uint value) { is_task_ = cast(ubyte)value; }
+
+ uint start;
+ uint mark_indent;
+ uint contents_indent;
+ OFF block_byte_off;
+ OFF task_mark_off;
+}
+
+
+int md_process_normal_block_contents(MD_CTX* ctx, const MD_LINE* lines, int n_lines)
+{
+ int i;
+ int ret;
+
+ ret = (md_analyze_inlines(ctx, lines, n_lines, FALSE));
+ if (ret < 0) goto abort;
+ ret = (md_process_inlines(ctx, lines, n_lines));
+ if (ret < 0) goto abort;
+
+abort:
+ /* Free any temporary memory blocks stored within some dummy marks. */
+ for(i = ctx.PTR_CHAIN.head; i >= 0; i = ctx.marks[i].next)
+ free(md_mark_get_ptr(ctx, i));
+ ctx.PTR_CHAIN.head = -1;
+ ctx.PTR_CHAIN.tail = -1;
+
+ return ret;
+}
+
+int md_process_verbatim_block_contents(MD_CTX* ctx, MD_TEXTTYPE text_type, const MD_VERBATIMLINE* lines, int n_lines)
+{
+ static immutable string indent_chunk_str = " ";
+
+ int i;
+ int ret = 0;
+
+ for(i = 0; i < n_lines; i++) {
+ const MD_VERBATIMLINE* line = &lines[i];
+ int indent = line.indent;
+
+ assert(indent >= 0);
+
+ /* Output code indentation. */
+ while(indent > cast(int)(indent_chunk_str.length)) {
+ ret = MD_TEXT(ctx, text_type, indent_chunk_str.ptr, cast(SZ)(indent_chunk_str.length));
+ if (ret != 0) goto abort;
+ indent -= indent_chunk_str.length;
+ }
+ if(indent > 0)
+ {
+ ret = MD_TEXT(ctx, text_type, indent_chunk_str.ptr, indent);
+ if (ret != 0) goto abort;
+ }
+
+ /* Output the code line itself. */
+ ret = MD_TEXT_INSECURE(ctx, text_type, ctx.STR(line.beg), line.end - line.beg);
+ if (ret != 0) goto abort;
+
+ /* Enforce end-of-line. */
+ ret = MD_TEXT(ctx, text_type, "\n", 1);
+ if (ret != 0) goto abort;
+ }
+
+abort:
+ return ret;
+}
+
+static int
+md_process_code_block_contents(MD_CTX* ctx, int is_fenced, const(MD_VERBATIMLINE)* lines, int n_lines)
+{
+ if(is_fenced) {
+ /* Skip the first line in case of fenced code: It is the fence.
+ * (Only the starting fence is present due to logic in md_analyze_line().) */
+ lines++;
+ n_lines--;
+ } else {
+ /* Ignore blank lines at start/end of indented code block. */
+ while(n_lines > 0 && lines[0].beg == lines[0].end) {
+ lines++;
+ n_lines--;
+ }
+ while(n_lines > 0 && lines[n_lines-1].beg == lines[n_lines-1].end) {
+ n_lines--;
+ }
+ }
+
+ if(n_lines == 0)
+ return 0;
+
+ return md_process_verbatim_block_contents(ctx, MD_TEXT_CODE, lines, n_lines);
+}
+
+int md_setup_fenced_code_detail(MD_CTX* ctx, const(MD_BLOCK)* block, MD_BLOCK_CODE_DETAIL* det,
+ MD_ATTRIBUTE_BUILD* info_build, MD_ATTRIBUTE_BUILD* lang_build)
+{
+ const(MD_VERBATIMLINE)* fence_line = cast(const(MD_VERBATIMLINE)*)(block + 1);
+ OFF beg = fence_line.beg;
+ OFF end = fence_line.end;
+ OFF lang_end;
+ CHAR fence_ch = ctx.CH(fence_line.beg);
+ int ret = 0;
+
+ /* Skip the fence itself. */
+ while(beg < ctx.size && ctx.CH(beg) == fence_ch)
+ beg++;
+ /* Trim initial spaces. */
+ while(beg < ctx.size && ctx.CH(beg) == ' ')
+ beg++;
+
+ /* Trim trailing spaces. */
+ while(end > beg && ctx.CH(end-1) == ' ')
+ end--;
+
+ /* Build info string attribute. */
+ ret = (md_build_attribute(ctx, ctx.STR(beg), end - beg, 0, &det.info, info_build));
+ if (ret < 0) goto abort;
+
+ /* Build info string attribute. */
+ lang_end = beg;
+ while(lang_end < end && !ctx.ISWHITESPACE(lang_end))
+ lang_end++;
+ ret = (md_build_attribute(ctx, ctx.STR(beg), lang_end - beg, 0, &det.lang, lang_build));
+ if (ret < 0) goto abort;
+
+ det.fence_char = fence_ch;
+
+abort:
+ return ret;
+}
+
+static int
+md_process_leaf_block(MD_CTX* ctx, const MD_BLOCK* block)
+{
+ static union HeaderOrCode
+ {
+ MD_BLOCK_H_DETAIL header;
+ MD_BLOCK_CODE_DETAIL code;
+ }
+ HeaderOrCode det;
+ MD_ATTRIBUTE_BUILD info_build;
+ MD_ATTRIBUTE_BUILD lang_build;
+ int is_in_tight_list;
+ int clean_fence_code_detail = FALSE;
+ int ret = 0;
+
+ memset(&det, 0, det.sizeof);
+
+ if(ctx.n_containers == 0)
+ is_in_tight_list = FALSE;
+ else
+ is_in_tight_list = !ctx.containers[ctx.n_containers-1].is_loose;
+
+ switch(block.type)
+ {
+ case MD_BLOCK_H:
+ det.header.level = block.data;
+ break;
+
+ case MD_BLOCK_CODE:
+ /* For fenced code block, we may need to set the info string. */
+ if(block.data != 0) {
+ memset(&det.code, 0, MD_BLOCK_CODE_DETAIL.sizeof);
+ clean_fence_code_detail = TRUE;
+ ret = (md_setup_fenced_code_detail(ctx, block, &det.code, &info_build, &lang_build));
+ if (ret < 0) goto abort;
+ }
+ break;
+
+ default:
+ /* Noop. */
+ break;
+ }
+
+ if(!is_in_tight_list || block.type != MD_BLOCK_P)
+ {
+ ret = MD_ENTER_BLOCK(ctx, block.type, cast(void*) &det);
+ if (ret != 0) goto abort;
+ }
+
+ /* Process the block contents accordingly to is type. */
+ switch(block.type) {
+ case MD_BLOCK_HR:
+ /* noop */
+ break;
+
+ case MD_BLOCK_CODE:
+ ret = (md_process_code_block_contents(ctx, (block.data != 0),
+ cast(const(MD_VERBATIMLINE)*)(block + 1), block.n_lines));
+ if (ret < 0) goto abort;
+ break;
+
+ case MD_BLOCK_HTML:
+ ret = (md_process_verbatim_block_contents(ctx, MD_TEXT_HTML,
+ cast(const(MD_VERBATIMLINE)*)(block + 1), block.n_lines));
+ if (ret < 0) goto abort;
+ break;
+
+ case MD_BLOCK_TABLE:
+ ret = (md_process_table_block_contents(ctx, block.data,
+ cast(const(MD_LINE)*)(block + 1), block.n_lines));
+ if (ret < 0) goto abort;
+ break;
+
+ default:
+ ret = (md_process_normal_block_contents(ctx,
+ cast(const(MD_LINE)*)(block + 1), block.n_lines));
+ if (ret < 0) goto abort;
+ break;
+ }
+
+ if(!is_in_tight_list || block.type != MD_BLOCK_P)
+ {
+ ret = MD_LEAVE_BLOCK(ctx, block.type, cast(void*) &det);
+ if (ret != 0) goto abort;
+ }
+
+abort:
+ if(clean_fence_code_detail) {
+ md_free_attribute(ctx, &info_build);
+ md_free_attribute(ctx, &lang_build);
+ }
+ return ret;
+}
+
+int md_process_all_blocks(MD_CTX* ctx)
+{
+ int byte_off = 0;
+ int ret = 0;
+
+ /* ctx.containers now is not needed for detection of lists and list items
+ * so we reuse it for tracking what lists are loose or tight. We rely
+ * on the fact the vector is large enough to hold the deepest nesting
+ * level of lists. */
+ ctx.n_containers = 0;
+
+ while(byte_off < ctx.n_block_bytes) {
+ MD_BLOCK* block = cast(MD_BLOCK*)(cast(char*)ctx.block_bytes + byte_off);
+ static union Det
+ {
+ MD_BLOCK_UL_DETAIL ul;
+ MD_BLOCK_OL_DETAIL ol;
+ MD_BLOCK_LI_DETAIL li;
+ }
+
+ Det det;
+
+ switch(block.type) {
+ case MD_BLOCK_UL:
+ det.ul.is_tight = (block.flags & MD_BLOCK_LOOSE_LIST) ? FALSE : TRUE;
+ det.ul.mark = cast(CHAR) block.data;
+ break;
+
+ case MD_BLOCK_OL:
+ det.ol.start = block.n_lines;
+ det.ol.is_tight = (block.flags & MD_BLOCK_LOOSE_LIST) ? FALSE : TRUE;
+ det.ol.mark_delimiter = cast(CHAR) block.data;
+ break;
+
+ case MD_BLOCK_LI:
+ det.li.is_task = (block.data != 0);
+ det.li.task_mark = cast(CHAR) block.data;
+ det.li.task_mark_offset = cast(OFF) block.n_lines;
+ break;
+
+ default:
+ /* noop */
+ break;
+ }
+
+ if(block.flags & MD_BLOCK_CONTAINER) {
+ if(block.flags & MD_BLOCK_CONTAINER_CLOSER) {
+ ret = MD_LEAVE_BLOCK(ctx, block.type, &det);
+ if (ret != 0) goto abort;
+
+ if(block.type == MD_BLOCK_UL || block.type == MD_BLOCK_OL || block.type == MD_BLOCK_QUOTE)
+ ctx.n_containers--;
+ }
+
+ if(block.flags & MD_BLOCK_CONTAINER_OPENER) {
+ ret = MD_ENTER_BLOCK(ctx, block.type, &det);
+ if (ret != 0) goto abort;
+
+ if(block.type == MD_BLOCK_UL || block.type == MD_BLOCK_OL) {
+ ctx.containers[ctx.n_containers].is_loose = (block.flags & MD_BLOCK_LOOSE_LIST);
+ ctx.n_containers++;
+ } else if(block.type == MD_BLOCK_QUOTE) {
+ /* This causes that any text in a block quote, even if
+ * nested inside a tight list item, is wrapped with
+ * <p>...</p>. */
+ ctx.containers[ctx.n_containers].is_loose = TRUE;
+ ctx.n_containers++;
+ }
+ }
+ } else {
+ ret = (md_process_leaf_block(ctx, block));
+ if (ret < 0) goto abort;
+
+ if(block.type == MD_BLOCK_CODE || block.type == MD_BLOCK_HTML)
+ byte_off += block.n_lines * MD_VERBATIMLINE.sizeof;
+ else
+ byte_off += block.n_lines * MD_LINE.sizeof;
+ }
+
+ byte_off += MD_BLOCK.sizeof;
+ }
+
+ ctx.n_block_bytes = 0;
+
+abort:
+ return ret;
+}
+
+
+/************************************
+ *** Grouping Lines into Blocks ***
+ ************************************/
+
+static void*
+md_push_block_bytes(MD_CTX* ctx, int n_bytes)
+{
+ void* ptr;
+
+ if(ctx.n_block_bytes + n_bytes > ctx.alloc_block_bytes) {
+ void* new_block_bytes;
+
+ ctx.alloc_block_bytes = (ctx.alloc_block_bytes > 0 ? ctx.alloc_block_bytes * 2 : 512);
+ new_block_bytes = realloc_safe(ctx.block_bytes, ctx.alloc_block_bytes);
+ if(new_block_bytes == null) {
+ ctx.MD_LOG("realloc() failed.");
+ return null;
+ }
+
+ /* Fix the .current_block after the reallocation. */
+ if(ctx.current_block != null) {
+ OFF off_current_block = cast(uint)( cast(char*) ctx.current_block - cast(char*) ctx.block_bytes );
+ ctx.current_block = cast(MD_BLOCK*) (cast(char*) new_block_bytes + off_current_block);
+ }
+
+ ctx.block_bytes = new_block_bytes;
+ }
+
+ ptr = cast(char*)ctx.block_bytes + ctx.n_block_bytes;
+ ctx.n_block_bytes += n_bytes;
+ return ptr;
+}
+
+static int
+md_start_new_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* line)
+{
+ MD_BLOCK* block;
+
+ assert(ctx.current_block == null);
+
+ block = cast(MD_BLOCK*) md_push_block_bytes(ctx, MD_BLOCK.sizeof);
+ if(block == null)
+ return -1;
+
+ switch(line.type) {
+ case MD_LINE_HR:
+ block.type = MD_BLOCK_HR;
+ break;
+
+ case MD_LINE_ATXHEADER:
+ case MD_LINE_SETEXTHEADER:
+ block.type = MD_BLOCK_H;
+ break;
+
+ case MD_LINE_FENCEDCODE:
+ case MD_LINE_INDENTEDCODE:
+ block.type = MD_BLOCK_CODE;
+ break;
+
+ case MD_LINE_TEXT:
+ block.type = MD_BLOCK_P;
+ break;
+
+ case MD_LINE_HTML:
+ block.type = MD_BLOCK_HTML;
+ break;
+
+ case MD_LINE_BLANK:
+ case MD_LINE_SETEXTUNDERLINE:
+ case MD_LINE_TABLEUNDERLINE:
+ default:
+ assert(false);
+ }
+
+ block.flags = 0;
+ block.data = line.data;
+ block.n_lines = 0;
+
+ ctx.current_block = block;
+ return 0;
+}
+
+/* Eat from start of current (textual) block any reference definitions and
+ * remember them so we can resolve any links referring to them.
+ *
+ * (Reference definitions can only be at start of it as they cannot break
+ * a paragraph.)
+ */
+int md_consume_link_reference_definitions(MD_CTX* ctx)
+{
+ MD_LINE* lines = cast(MD_LINE*) (ctx.current_block + 1);
+ int n_lines = ctx.current_block.n_lines;
+ int n = 0;
+
+ /* Compute how many lines at the start of the block form one or more
+ * reference definitions. */
+ while(n < n_lines) {
+ int n_link_ref_lines;
+
+ n_link_ref_lines = md_is_link_reference_definition(ctx,
+ lines + n, n_lines - n);
+ /* Not a reference definition? */
+ if(n_link_ref_lines == 0)
+ break;
+
+ /* We fail if it is the ref. def. but it could not be stored due
+ * a memory allocation error. */
+ if(n_link_ref_lines < 0)
+ return -1;
+
+ n += n_link_ref_lines;
+ }
+
+ /* If there was at least one reference definition, we need to remove
+ * its lines from the block, or perhaps even the whole block. */
+ if(n > 0) {
+ if(n == n_lines) {
+ /* Remove complete block. */
+ ctx.n_block_bytes -= n * MD_LINE.sizeof;
+ ctx.n_block_bytes -= MD_BLOCK.sizeof;
+ ctx.current_block = null;
+ } else {
+ /* Remove just some initial lines from the block. */
+ memmove(lines, lines + n, (n_lines - n) * MD_LINE.sizeof);
+ ctx.current_block.n_lines -= n;
+ ctx.n_block_bytes -= n * MD_LINE.sizeof;
+ }
+ }
+
+ return 0;
+}
+
+static int
+md_end_current_block(MD_CTX* ctx)
+{
+ int ret = 0;
+
+ if(ctx.current_block == null)
+ return ret;
+
+ /* Check whether there is a reference definition. (We do this here instead
+ * of in md_analyze_line() because reference definition can take multiple
+ * lines.) */
+ if(ctx.current_block.type == MD_BLOCK_P ||
+ (ctx.current_block.type == MD_BLOCK_H && (ctx.current_block.flags & MD_BLOCK_SETEXT_HEADER)))
+ {
+ MD_LINE* lines = cast(MD_LINE*) (ctx.current_block + 1);
+ if(ctx.CH(lines[0].beg) == '[') {
+ ret = (md_consume_link_reference_definitions(ctx));
+ if (ret < 0) goto abort;
+ if(ctx.current_block == null)
+ return ret;
+ }
+ }
+
+ if(ctx.current_block.type == MD_BLOCK_H && (ctx.current_block.flags & MD_BLOCK_SETEXT_HEADER)) {
+ int n_lines = ctx.current_block.n_lines;
+
+ if(n_lines > 1) {
+ /* Get rid of the underline. */
+ ctx.current_block.n_lines--;
+ ctx.n_block_bytes -= MD_LINE.sizeof;
+ } else {
+ /* Only the underline has left after eating the ref. defs.
+ * Keep the line as beginning of a new ordinary paragraph. */
+ ctx.current_block.type = MD_BLOCK_P;
+ return 0;
+ }
+ }
+
+ /* Mark we are not building any block anymore. */
+ ctx.current_block = null;
+
+abort:
+ return ret;
+}
+
+static int
+md_add_line_into_current_block(MD_CTX* ctx, const MD_LINE_ANALYSIS* analysis)
+{
+ assert(ctx.current_block != null);
+
+ if(ctx.current_block.type == MD_BLOCK_CODE || ctx.current_block.type == MD_BLOCK_HTML) {
+ MD_VERBATIMLINE* line;
+
+ line = cast(MD_VERBATIMLINE*) md_push_block_bytes(ctx, MD_VERBATIMLINE.sizeof);
+ if(line == null)
+ return -1;
+
+ line.indent = analysis.indent;
+ line.beg = analysis.beg;
+ line.end = analysis.end;
+ } else {
+ MD_LINE* line;
+
+ line = cast(MD_LINE*) md_push_block_bytes(ctx, MD_LINE.sizeof);
+ if(line == null)
+ return -1;
+
+ line.beg = analysis.beg;
+ line.end = analysis.end;
+ }
+ ctx.current_block.n_lines++;
+
+ return 0;
+}
+
+static int
+md_push_container_bytes(MD_CTX* ctx, MD_BLOCKTYPE type, uint start,
+ uint data, uint flags)
+{
+ MD_BLOCK* block;
+ int ret = 0;
+
+ ret = (md_end_current_block(ctx));
+ if (ret < 0) goto abort;
+
+ block = cast(MD_BLOCK*) md_push_block_bytes(ctx, MD_BLOCK.sizeof);
+ if(block == null)
+ return -1;
+
+ block.type = type;
+ block.flags = flags;
+ block.data = data;
+ block.n_lines = start;
+
+abort:
+ return ret;
+}
+
+
+
+/***********************
+ *** Line Analysis ***
+ ***********************/
+
+static int
+md_is_hr_line(MD_CTX* ctx, OFF beg, OFF* p_end, OFF* p_killer)
+{
+ OFF off = beg + 1;
+ int n = 1;
+
+ while(off < ctx.size && (ctx.CH(off) == ctx.CH(beg) || ctx.CH(off) == ' ' || ctx.CH(off) == '\t')) {
+ if(ctx.CH(off) == ctx.CH(beg))
+ n++;
+ off++;
+ }
+
+ if(n < 3) {
+ *p_killer = off;
+ return FALSE;
+ }
+
+ /* Nothing else can be present on the line. */
+ if(off < ctx.size && !ctx.ISNEWLINE(off)) {
+ *p_killer = off;
+ return FALSE;
+ }
+
+ *p_end = off;
+ return TRUE;
+}
+
+static int
+md_is_atxheader_line(MD_CTX* ctx, OFF beg, OFF* p_beg, OFF* p_end, uint* p_level)
+{
+ int n;
+ OFF off = beg + 1;
+
+ while(off < ctx.size && ctx.CH(off) == '#' && off - beg < 7)
+ off++;
+ n = off - beg;
+
+ if(n > 6)
+ return FALSE;
+ *p_level = n;
+
+ if(!(ctx.parser.flags & MD_FLAG_PERMISSIVEATXHEADERS) && off < ctx.size &&
+ ctx.CH(off) != ' ' && ctx.CH(off) != '\t' && !ctx.ISNEWLINE(off))
+ return FALSE;
+
+ while(off < ctx.size && ctx.CH(off) == ' ')
+ off++;
+ *p_beg = off;
+ *p_end = off;
+ return TRUE;
+}
+
+static int
+md_is_setext_underline(MD_CTX* ctx, OFF beg, OFF* p_end, uint* p_level)
+{
+ OFF off = beg + 1;
+
+ while(off < ctx.size && ctx.CH(off) == ctx.CH(beg))
+ off++;
+
+ /* Optionally, space(s) can follow. */
+ while(off < ctx.size && ctx.CH(off) == ' ')
+ off++;
+
+ /* But nothing more is allowed on the line. */
+ if(off < ctx.size && !ctx.ISNEWLINE(off))
+ return FALSE;
+
+ *p_level = (ctx.CH(beg) == '=' ? 1 : 2);
+ *p_end = off;
+ return TRUE;
+}
+
+int md_is_table_underline(MD_CTX* ctx, OFF beg, OFF* p_end, uint* p_col_count)
+{
+ OFF off = beg;
+ int found_pipe = FALSE;
+ uint col_count = 0;
+
+ if(off < ctx.size && ctx.CH(off) == '|') {
+ found_pipe = TRUE;
+ off++;
+ while(off < ctx.size && ctx.ISWHITESPACE(off))
+ off++;
+ }
+
+ while(1) {
+ OFF cell_beg;
+ int delimited = FALSE;
+
+ /* Cell underline ("-----", ":----", "----:" or ":----:") */
+ cell_beg = off;
+ if(off < ctx.size && ctx.CH(off) == ':')
+ off++;
+ while(off < ctx.size && ctx.CH(off) == '-')
+ off++;
+ if(off < ctx.size && ctx.CH(off) == ':')
+ off++;
+ if(off - cell_beg < 3)
+ return FALSE;
+
+ col_count++;
+
+ /* Pipe delimiter (optional at the end of line). */
+ while(off < ctx.size && ctx.ISWHITESPACE(off))
+ off++;
+ if(off < ctx.size && ctx.CH(off) == '|') {
+ delimited = TRUE;
+ found_pipe = TRUE;
+ off++;
+ while(off < ctx.size && ctx.ISWHITESPACE(off))
+ off++;
+ }
+
+ /* Success, if we reach end of line. */
+ if(off >= ctx.size || ctx.ISNEWLINE(off))
+ break;
+
+ if(!delimited)
+ return FALSE;
+ }
+
+ if(!found_pipe)
+ return FALSE;
+
+ *p_end = off;
+ *p_col_count = col_count;
+ return TRUE;
+}
+
+static int
+md_is_opening_code_fence(MD_CTX* ctx, OFF beg, OFF* p_end)
+{
+ OFF off = beg;
+
+ while(off < ctx.size && ctx.CH(off) == ctx.CH(beg))
+ off++;
+
+ /* Fence must have at least three characters. */
+ if(off - beg < 3)
+ return FALSE;
+
+ ctx.code_fence_length = off - beg;
+
+ /* Optionally, space(s) can follow. */
+ while(off < ctx.size && ctx.CH(off) == ' ')
+ off++;
+
+ /* Optionally, an info string can follow. */
+ while(off < ctx.size && !ctx.ISNEWLINE(off)) {
+ /* Backtick-based fence must not contain '`' in the info string. */
+ if(ctx.CH(beg) == '`' && ctx.CH(off) == '`')
+ return FALSE;
+ off++;
+ }
+
+ *p_end = off;
+ return TRUE;
+}
+
+static int
+md_is_closing_code_fence(MD_CTX* ctx, CHAR ch, OFF beg, OFF* p_end)
+{
+ OFF off = beg;
+ int ret = FALSE;
+
+ /* Closing fence must have at least the same length and use same char as
+ * opening one. */
+ while(off < ctx.size && ctx.CH(off) == ch)
+ off++;
+ if(off - beg < ctx.code_fence_length)
+ goto out_;
+
+ /* Optionally, space(s) can follow */
+ while(off < ctx.size && ctx.CH(off) == ' ')
+ off++;
+
+ /* But nothing more is allowed on the line. */
+ if(off < ctx.size && !ctx.ISNEWLINE(off))
+ goto out_;
+
+ ret = TRUE;
+
+out_:
+ /* Note we set *p_end even on failure: If we are not closing fence, caller
+ * would eat the line anyway without any parsing. */
+ *p_end = off;
+ return ret;
+}
+
+/* Returns type of the raw HTML block, or FALSE if it is not HTML block.
+ * (Refer to CommonMark specification for details about the types.)
+ */
+int md_is_html_block_start_condition(MD_CTX* ctx, OFF beg)
+{
+ /* Type 6 is started by a long list of allowed tags. We use two-level
+ * tree to speed-up the search. */
+
+ static immutable string Xend = null;
+ static immutable string[] t1 = [ "script", "pre", "style", Xend ];
+ static immutable string[] a6 = [ "address", "article", "aside", Xend ];
+ static immutable string[] b6 = [ "base", "basefont", "blockquote", "body", Xend ];
+ static immutable string[] c6 = [ "caption", "center", "col", "colgroup", Xend ];
+ static immutable string[] d6 = [ "dd", "details", "dialog", "dir",
+ "div", "dl", "dt", Xend ];
+ static immutable string[] f6 = [ "fieldset", "figcaption", "figure", "footer",
+ "form", "frame", "frameset", Xend ];
+ static immutable string[] h6 = [ "h1", "head", "header", "hr", "html", Xend ];
+ static immutable string[] i6 = [ "iframe", Xend ];
+ static immutable string[] l6 = [ "legend", "li", "link", Xend ];
+ static immutable string[] m6 = [ "main", "menu", "menuitem", Xend ];
+ static immutable string[] n6 = [ "nav", "noframes", Xend ];
+ static immutable string[] o6 = [ "ol", "optgroup", "option", Xend ];
+ static immutable string[] p6 = [ "p", "param", Xend ];
+ static immutable string[] s6 = [ "section", "source", "summary", Xend ];
+ static immutable string[] t6 = [ "table", "tbody", "td", "tfoot", "th",
+ "thead", "title", "tr", "track", Xend ];
+ static immutable string[] u6 = [ "ul", Xend ];
+ static immutable string[] xx = [ Xend ];
+
+ immutable(string)*[26] map6;
+ map6[0] = a6.ptr;
+ map6[1] = b6.ptr;
+ map6[2] = c6.ptr;
+ map6[3] = d6.ptr;
+ map6[4] = xx.ptr;
+ map6[5] = f6.ptr;
+ map6[6] = xx.ptr;
+ map6[7] = h6.ptr;
+ map6[8] = i6.ptr;
+ map6[9] = xx.ptr;
+ map6[10] = xx.ptr;
+ map6[11] = l6.ptr;
+ map6[12] = m6.ptr;
+ map6[13] = n6.ptr;
+ map6[14] = o6.ptr;
+ map6[15] = p6.ptr;
+ map6[16] = xx.ptr;
+ map6[17] = xx.ptr;
+ map6[18] = s6.ptr;
+ map6[19] = t6.ptr;
+ map6[20] = u6.ptr;
+ map6[21] = xx.ptr;
+ map6[22] = xx.ptr;
+ map6[23] = xx.ptr;
+ map6[24] = xx.ptr;
+ map6[25] = xx.ptr;
+
+ OFF off = beg + 1;
+ int i;
+
+ /* Check for type 1: <script, <pre, or <style */
+ for(i = 0; t1[i].ptr != null; i++)
+ {
+ if(off + t1[i].length <= ctx.size)
+ {
+ if(md_ascii_case_eq(ctx.STR(off), t1[i].ptr, cast(uint)(t1[i].length)))
+ return 1;
+ }
+ }
+
+ /* Check for type 2: <!-- */
+ if(off + 3 < ctx.size && ctx.CH(off) == '!' && ctx.CH(off+1) == '-' && ctx.CH(off+2) == '-')
+ return 2;
+
+ /* Check for type 3: <? */
+ if(off < ctx.size && ctx.CH(off) == '?')
+ return 3;
+
+ /* Check for type 4 or 5: <! */
+ if(off < ctx.size && ctx.CH(off) == '!') {
+ /* Check for type 4: <! followed by uppercase letter. */
+ if(off + 1 < ctx.size && ctx.ISUPPER(off+1))
+ return 4;
+
+ /* Check for type 5: <![CDATA[ */
+ if(off + 8 < ctx.size) {
+ if(md_ascii_eq(ctx.STR(off), "![CDATA[", 8 * CHAR.sizeof))
+ return 5;
+ }
+ }
+
+ /* Check for type 6: Many possible starting tags listed above. */
+ if(off + 1 < ctx.size && (ctx.ISALPHA(off) || (ctx.CH(off) == '/' && ctx.ISALPHA(off+1)))) {
+ int slot;
+ const(string)* tags;
+
+ if(ctx.CH(off) == '/')
+ off++;
+
+ slot = (ctx.ISUPPER(off) ? ctx.CH(off) - 'A' : ctx.CH(off) - 'a');
+ tags = map6[slot];
+
+ for(i = 0; tags[i].ptr != null; i++) {
+ if(off + tags[i].length <= ctx.size) {
+ if(md_ascii_case_eq(ctx.STR(off), tags[i].ptr, cast(uint) tags[i].length)) {
+ OFF tmp = cast(uint)(off + tags[i].length);
+ if(tmp >= ctx.size)
+ return 6;
+ if(ctx.ISBLANK(tmp) || ctx.ISNEWLINE(tmp) || ctx.CH(tmp) == '>')
+ return 6;
+ if(tmp+1 < ctx.size && ctx.CH(tmp) == '/' && ctx.CH(tmp+1) == '>')
+ return 6;
+ break;
+ }
+ }
+ }
+ }
+
+ /* Check for type 7: any COMPLETE other opening or closing tag. */
+ if(off + 1 < ctx.size) {
+ OFF end;
+
+ if(md_is_html_tag(ctx, null, 0, beg, ctx.size, &end)) {
+ /* Only optional whitespace and new line may follow. */
+ while(end < ctx.size && ctx.ISWHITESPACE(end))
+ end++;
+ if(end >= ctx.size || ctx.ISNEWLINE(end))
+ return 7;
+ }
+ }
+
+ return FALSE;
+}
+
+/* Case sensitive check whether there is a substring 'what' between 'beg'
+ * and end of line. */
+static int
+md_line_contains(MD_CTX* ctx, OFF beg, const(CHAR)* what, SZ what_len, OFF* p_end)
+{
+ OFF i;
+ for(i = beg; i + what_len < ctx.size; i++) {
+ if(ctx.ISNEWLINE(i))
+ break;
+ if(memcmp(ctx.STR(i), what, what_len * CHAR.sizeof) == 0) {
+ *p_end = i + what_len;
+ return TRUE;
+ }
+ }
+
+ *p_end = i;
+ return FALSE;
+}
+
+/* Returns type of HTML block end condition or FALSE if not an end condition.
+ *
+ * Note it fills p_end even when it is not end condition as the caller
+ * does not need to analyze contents of a raw HTML block.
+ */
+int md_is_html_block_end_condition(MD_CTX* ctx, OFF beg, OFF* p_end)
+{
+ switch(ctx.html_block_type) {
+ case 1:
+ {
+ OFF off = beg;
+
+ while(off < ctx.size && !ctx.ISNEWLINE(off)) {
+ if(ctx.CH(off) == '<') {
+ if(md_ascii_case_eq(ctx.STR(off), "</script>", 9)) {
+ *p_end = off + 9;
+ return TRUE;
+ }
+
+ if(md_ascii_case_eq(ctx.STR(off), "</style>", 8)) {
+ *p_end = off + 8;
+ return TRUE;
+ }
+
+ if(md_ascii_case_eq(ctx.STR(off), "</pre>", 6)) {
+ *p_end = off + 6;
+ return TRUE;
+ }
+ }
+
+ off++;
+ }
+ *p_end = off;
+ return FALSE;
+ }
+
+ case 2:
+ return (md_line_contains(ctx, beg, "-->", 3, p_end) ? 2 : FALSE);
+
+ case 3:
+ return (md_line_contains(ctx, beg, "?>", 2, p_end) ? 3 : FALSE);
+
+ case 4:
+ return (md_line_contains(ctx, beg, ">", 1, p_end) ? 4 : FALSE);
+
+ case 5:
+ return (md_line_contains(ctx, beg, "]]>", 3, p_end) ? 5 : FALSE);
+
+ case 6: /* Pass through */
+ case 7:
+ *p_end = beg;
+ return (ctx.ISNEWLINE(beg) ? ctx.html_block_type : FALSE);
+
+ default:
+ assert(false);
+ }
+}
+
+
+static int
+md_is_container_compatible(const MD_CONTAINER* pivot, const MD_CONTAINER* container)
+{
+ /* Block quote has no "items" like lists. */
+ if(container.ch == '>')
+ return FALSE;
+
+ if(container.ch != pivot.ch)
+ return FALSE;
+ if(container.mark_indent > pivot.contents_indent)
+ return FALSE;
+
+ return TRUE;
+}
+
+static int
+md_push_container(MD_CTX* ctx, const MD_CONTAINER* container)
+{
+ if(ctx.n_containers >= ctx.alloc_containers) {
+ MD_CONTAINER* new_containers;
+
+ ctx.alloc_containers = (ctx.alloc_containers > 0 ? ctx.alloc_containers * 2 : 16);
+ new_containers = cast(MD_CONTAINER*) realloc_safe(ctx.containers, ctx.alloc_containers * MD_CONTAINER.sizeof);
+ if (new_containers == null) {
+ ctx.MD_LOG("realloc() failed.");
+ return -1;
+ }
+
+ ctx.containers = new_containers;
+ }
+
+ memcpy(&ctx.containers[ctx.n_containers++], container, MD_CONTAINER.sizeof);
+ return 0;
+}
+
+static int
+md_enter_child_containers(MD_CTX* ctx, int n_children, uint data)
+{
+ int i;
+ int ret = 0;
+
+ for(i = ctx.n_containers - n_children; i < ctx.n_containers; i++) {
+ MD_CONTAINER* c = &ctx.containers[i];
+ int is_ordered_list = FALSE;
+
+ switch(c.ch) {
+ case ')':
+ case '.':
+ is_ordered_list = TRUE;
+ /* Pass through */
+ goto case '-';
+
+ case '-':
+ case '+':
+ case '*':
+ /* Remember offset in ctx.block_bytes so we can revisit the
+ * block if we detect it is a loose list. */
+ md_end_current_block(ctx);
+ c.block_byte_off = ctx.n_block_bytes;
+
+ ret = (md_push_container_bytes(ctx,
+ (is_ordered_list ? MD_BLOCK_OL : MD_BLOCK_UL),
+ c.start, data, MD_BLOCK_CONTAINER_OPENER));
+ if (ret < 0) goto abort;
+ ret = (md_push_container_bytes(ctx, MD_BLOCK_LI,
+ c.task_mark_off,
+ (c.is_task ? ctx.CH(c.task_mark_off) : 0),
+ MD_BLOCK_CONTAINER_OPENER));
+ if (ret < 0) goto abort;
+ break;
+
+ case '>':
+ ret = (md_push_container_bytes(ctx, MD_BLOCK_QUOTE, 0, 0, MD_BLOCK_CONTAINER_OPENER));
+ if (ret < 0) goto abort;
+ break;
+
+ default:
+ assert(false);
+ }
+ }
+
+abort:
+ return ret;
+}
+
+static int
+md_leave_child_containers(MD_CTX* ctx, int n_keep)
+{
+ int ret = 0;
+
+ while(ctx.n_containers > n_keep) {
+ MD_CONTAINER* c = &ctx.containers[ctx.n_containers-1];
+ int is_ordered_list = FALSE;
+
+ switch(c.ch) {
+ case ')':
+ case '.':
+ is_ordered_list = TRUE;
+ /* Pass through */
+ goto case '-';
+
+ case '-':
+ case '+':
+ case '*':
+ ret = (md_push_container_bytes(ctx, MD_BLOCK_LI,
+ c.task_mark_off, (c.is_task ? ctx.CH(c.task_mark_off) : 0),
+ MD_BLOCK_CONTAINER_CLOSER));
+ if (ret < 0) goto abort;
+ ret = (md_push_container_bytes(ctx,
+ (is_ordered_list ? MD_BLOCK_OL : MD_BLOCK_UL), 0,
+ c.ch, MD_BLOCK_CONTAINER_CLOSER));
+ if (ret < 0) goto abort;
+ break;
+
+ case '>':
+ ret = (md_push_container_bytes(ctx, MD_BLOCK_QUOTE, 0,
+ 0, MD_BLOCK_CONTAINER_CLOSER));
+ if (ret < 0) goto abort;
+ break;
+
+ default:
+ assert(false);
+ }
+
+ ctx.n_containers--;
+ }
+
+abort:
+ return ret;
+}
+
+static int
+md_is_container_mark(MD_CTX* ctx, uint indent, OFF beg, OFF* p_end, MD_CONTAINER* p_container)
+{
+ OFF off = beg;
+ OFF max_end;
+
+ if(indent >= ctx.code_indent_offset)
+ return FALSE;
+
+ /* Check for block quote mark. */
+ if(off < ctx.size && ctx.CH(off) == '>') {
+ off++;
+ p_container.ch = '>';
+ p_container.is_loose = FALSE;
+ p_container.is_task = FALSE;
+ p_container.mark_indent = indent;
+ p_container.contents_indent = indent + 1;
+ *p_end = off;
+ return TRUE;
+ }
+
+ /* Check for list item bullet mark. */
+ if(off+1 < ctx.size && ctx.ISANYOF(off, "-+*") && (ctx.ISBLANK(off+1) || ctx.ISNEWLINE(off+1))) {
+ p_container.ch = ctx.CH(off);
+ p_container.is_loose = FALSE;
+ p_container.is_task = FALSE;
+ p_container.mark_indent = indent;
+ p_container.contents_indent = indent + 1;
+ *p_end = off + 1;
+ return TRUE;
+ }
+
+ /* Check for ordered list item marks. */
+ max_end = off + 9;
+ if(max_end > ctx.size)
+ max_end = ctx.size;
+ p_container.start = 0;
+ while(off < max_end && ctx.ISDIGIT(off)) {
+ p_container.start = p_container.start * 10 + ctx.CH(off) - '0';
+ off++;
+ }
+ if(off+1 < ctx.size && (ctx.CH(off) == '.' || ctx.CH(off) == ')') && (ctx.ISBLANK(off+1) || ctx.ISNEWLINE(off+1))) {
+ p_container.ch = ctx.CH(off);
+ p_container.is_loose = FALSE;
+ p_container.is_task = FALSE;
+ p_container.mark_indent = indent;
+ p_container.contents_indent = indent + off - beg + 1;
+ *p_end = off + 1;
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+uint md_line_indentation(MD_CTX* ctx, uint total_indent, OFF beg, OFF* p_end)
+{
+ OFF off = beg;
+ uint indent = total_indent;
+
+ while(off < ctx.size && ctx.ISBLANK(off)) {
+ if(ctx.CH(off) == '\t')
+ indent = (indent + 4) & ~3;
+ else
+ indent++;
+ off++;
+ }
+
+ *p_end = off;
+ return indent - total_indent;
+}
+
+static const MD_LINE_ANALYSIS md_dummy_blank_line = { MD_LINE_BLANK, 0 };
+
+/* Analyze type of the line and find some its properties. This serves as a
+ * main input for determining type and boundaries of a block. */
+int md_analyze_line(MD_CTX* ctx, OFF beg, OFF* p_end,
+ const(MD_LINE_ANALYSIS)* pivot_line, MD_LINE_ANALYSIS* line)
+{
+ uint total_indent = 0;
+ int n_parents = 0;
+ int n_brothers = 0;
+ int n_children = 0;
+ MD_CONTAINER container = { 0 };
+ int prev_line_has_list_loosening_effect = ctx.last_line_has_list_loosening_effect;
+ OFF off = beg;
+ OFF hr_killer = 0;
+ int ret = 0;
+
+ line.indent = md_line_indentation(ctx, total_indent, off, &off);
+ total_indent += line.indent;
+ line.beg = off;
+
+ /* Given the indentation and block quote marks '>', determine how many of
+ * the current containers are our parents. */
+ while(n_parents < ctx.n_containers) {
+ MD_CONTAINER* c = &ctx.containers[n_parents];
+
+ if(c.ch == '>' && line.indent < ctx.code_indent_offset &&
+ off < ctx.size && ctx.CH(off) == '>')
+ {
+ /* Block quote mark. */
+ off++;
+ total_indent++;
+ line.indent = md_line_indentation(ctx, total_indent, off, &off);
+ total_indent += line.indent;
+
+ /* The optional 1st space after '>' is part of the block quote mark. */
+ if(line.indent > 0)
+ line.indent--;
+
+ line.beg = off;
+ } else if(c.ch != '>' && line.indent >= c.contents_indent) {
+ /* List. */
+ line.indent -= c.contents_indent;
+ } else {
+ break;
+ }
+
+ n_parents++;
+ }
+
+ if(off >= ctx.size || ctx.ISNEWLINE(off)) {
+ /* Blank line does not need any real indentation to be nested inside
+ * a list. */
+ if(n_brothers + n_children == 0) {
+ while(n_parents < ctx.n_containers && ctx.containers[n_parents].ch != '>')
+ n_parents++;
+ }
+ }
+
+ while(TRUE) {
+ /* Check whether we are fenced code continuation. */
+ if(pivot_line.type == MD_LINE_FENCEDCODE) {
+ line.beg = off;
+
+ /* We are another MD_LINE_FENCEDCODE unless we are closing fence
+ * which we transform into MD_LINE_BLANK. */
+ if(line.indent < ctx.code_indent_offset) {
+ if(md_is_closing_code_fence(ctx, ctx.CH(pivot_line.beg), off, &off)) {
+ line.type = MD_LINE_BLANK;
+ ctx.last_line_has_list_loosening_effect = FALSE;
+ break;
+ }
+ }
+
+ /* Change indentation accordingly to the initial code fence. */
+ if(n_parents == ctx.n_containers) {
+ if(line.indent > pivot_line.indent)
+ line.indent -= pivot_line.indent;
+ else
+ line.indent = 0;
+
+ line.type = MD_LINE_FENCEDCODE;
+ break;
+ }
+ }
+
+ /* Check whether we are HTML block continuation. */
+ if(pivot_line.type == MD_LINE_HTML && ctx.html_block_type > 0) {
+ int html_block_type;
+
+ html_block_type = md_is_html_block_end_condition(ctx, off, &off);
+ if(html_block_type > 0) {
+ assert(html_block_type == ctx.html_block_type);
+
+ /* Make sure this is the last line of the block. */
+ ctx.html_block_type = 0;
+
+ /* Some end conditions serve as blank lines at the same time. */
+ if(html_block_type == 6 || html_block_type == 7) {
+ line.type = MD_LINE_BLANK;
+ line.indent = 0;
+ break;
+ }
+ }
+
+ if(n_parents == ctx.n_containers) {
+ line.type = MD_LINE_HTML;
+ break;
+ }
+ }
+
+ /* Check for blank line. */
+ if(off >= ctx.size || ctx.ISNEWLINE(off)) {
+ if(pivot_line.type == MD_LINE_INDENTEDCODE && n_parents == ctx.n_containers) {
+ line.type = MD_LINE_INDENTEDCODE;
+ if(line.indent > ctx.code_indent_offset)
+ line.indent -= ctx.code_indent_offset;
+ else
+ line.indent = 0;
+ ctx.last_line_has_list_loosening_effect = FALSE;
+ } else {
+ line.type = MD_LINE_BLANK;
+ ctx.last_line_has_list_loosening_effect = (n_parents > 0 &&
+ n_brothers + n_children == 0 &&
+ ctx.containers[n_parents-1].ch != '>');
+
+ /* See https://github.com/mity/md4c/issues/6
+ *
+ * This ugly checking tests we are in (yet empty) list item but not
+ * its very first line (with the list item mark).
+ *
+ * If we are such blank line, then any following non-blank line
+ * which would be part of this list item actually ends the list
+ * because "a list item can begin with at most one blank line."
+ */
+ if(n_parents > 0 && ctx.containers[n_parents-1].ch != '>' &&
+ n_brothers + n_children == 0 && ctx.current_block == null &&
+ ctx.n_block_bytes > cast(int) MD_BLOCK.sizeof)
+ {
+ MD_BLOCK* top_block = cast(MD_BLOCK*) (cast(char*)ctx.block_bytes + ctx.n_block_bytes - MD_BLOCK.sizeof);
+ if(top_block.type == MD_BLOCK_LI)
+ ctx.last_list_item_starts_with_two_blank_lines = TRUE;
+ }
+ }
+ break;
+ } else {
+ /* This is 2nd half of the hack. If the flag is set (that is there
+ * were 2nd blank line at the start of the list item) and we would also
+ * belonging to such list item, then interrupt the list. */
+ ctx.last_line_has_list_loosening_effect = FALSE;
+ if(ctx.last_list_item_starts_with_two_blank_lines) {
+ if(n_parents > 0 && ctx.containers[n_parents-1].ch != '>' &&
+ n_brothers + n_children == 0 && ctx.current_block == null &&
+ ctx.n_block_bytes > cast(int) MD_BLOCK.sizeof)
+ {
+ MD_BLOCK* top_block = cast(MD_BLOCK*) (cast(char*)ctx.block_bytes + ctx.n_block_bytes - MD_BLOCK.sizeof);
+ if(top_block.type == MD_BLOCK_LI)
+ n_parents--;
+ }
+
+ ctx.last_list_item_starts_with_two_blank_lines = FALSE;
+ }
+ }
+
+ /* Check whether we are Setext underline. */
+ if(line.indent < ctx.code_indent_offset && pivot_line.type == MD_LINE_TEXT
+ && (ctx.CH(off) == '=' || ctx.CH(off) == '-')
+ && (n_parents == ctx.n_containers))
+ {
+ uint level;
+
+ if(md_is_setext_underline(ctx, off, &off, &level)) {
+ line.type = MD_LINE_SETEXTUNDERLINE;
+ line.data = level;
+ break;
+ }
+ }
+
+ /* Check for thematic break line. */
+ if(line.indent < ctx.code_indent_offset && ctx.ISANYOF(off, "-_*") && off >= hr_killer) {
+ if(md_is_hr_line(ctx, off, &off, &hr_killer)) {
+ line.type = MD_LINE_HR;
+ break;
+ }
+ }
+
+ /* Check for "brother" container. I.e. whether we are another list item
+ * in already started list. */
+ if(n_parents < ctx.n_containers && n_brothers + n_children == 0) {
+ OFF tmp;
+
+ if(md_is_container_mark(ctx, line.indent, off, &tmp, &container) &&
+ md_is_container_compatible(&ctx.containers[n_parents], &container))
+ {
+ pivot_line = &md_dummy_blank_line;
+
+ off = tmp;
+
+ total_indent += container.contents_indent - container.mark_indent;
+ line.indent = md_line_indentation(ctx, total_indent, off, &off);
+ total_indent += line.indent;
+ line.beg = off;
+
+ /* Some of the following whitespace actually still belongs to the mark. */
+ if(off >= ctx.size || ctx.ISNEWLINE(off)) {
+ container.contents_indent++;
+ } else if(line.indent <= ctx.code_indent_offset) {
+ container.contents_indent += line.indent;
+ line.indent = 0;
+ } else {
+ container.contents_indent += 1;
+ line.indent--;
+ }
+
+ ctx.containers[n_parents].mark_indent = container.mark_indent;
+ ctx.containers[n_parents].contents_indent = container.contents_indent;
+
+ n_brothers++;
+ continue;
+ }
+ }
+
+ /* Check for indented code.
+ * Note indented code block cannot interrupt a paragraph. */
+ if(line.indent >= ctx.code_indent_offset &&
+ (pivot_line.type == MD_LINE_BLANK || pivot_line.type == MD_LINE_INDENTEDCODE))
+ {
+ line.type = MD_LINE_INDENTEDCODE;
+ assert(line.indent >= ctx.code_indent_offset);
+ line.indent -= ctx.code_indent_offset;
+ line.data = 0;
+ break;
+ }
+
+ /* Check for start of a new container block. */
+ if(line.indent < ctx.code_indent_offset &&
+ md_is_container_mark(ctx, line.indent, off, &off, &container))
+ {
+ if(pivot_line.type == MD_LINE_TEXT && n_parents == ctx.n_containers &&
+ (off >= ctx.size || ctx.ISNEWLINE(off)) && container.ch != '>')
+ {
+ /* Noop. List mark followed by a blank line cannot interrupt a paragraph. */
+ } else if(pivot_line.type == MD_LINE_TEXT && n_parents == ctx.n_containers &&
+ (container.ch == '.' || container.ch == ')') && container.start != 1)
+ {
+ /* Noop. Ordered list cannot interrupt a paragraph unless the start index is 1. */
+ } else {
+ total_indent += container.contents_indent - container.mark_indent;
+ line.indent = md_line_indentation(ctx, total_indent, off, &off);
+ total_indent += line.indent;
+
+ line.beg = off;
+ line.data = container.ch;
+
+ /* Some of the following whitespace actually still belongs to the mark. */
+ if(off >= ctx.size || ctx.ISNEWLINE(off)) {
+ container.contents_indent++;
+ } else if(line.indent <= ctx.code_indent_offset) {
+ container.contents_indent += line.indent;
+ line.indent = 0;
+ } else {
+ container.contents_indent += 1;
+ line.indent--;
+ }
+
+ if(n_brothers + n_children == 0)
+ pivot_line = &md_dummy_blank_line;
+
+ if(n_children == 0)
+ {
+ ret = (md_leave_child_containers(ctx, n_parents + n_brothers));
+ if (ret < 0) goto abort;
+ }
+
+ n_children++;
+ ret = (md_push_container(ctx, &container));
+ if (ret < 0) goto abort;
+ continue;
+ }
+ }
+
+ /* Check whether we are table continuation. */
+ if(pivot_line.type == MD_LINE_TABLE && md_is_table_row(ctx, off, &off) &&
+ n_parents == ctx.n_containers)
+ {
+ line.type = MD_LINE_TABLE;
+ break;
+ }
+
+ /* Check for ATX header. */
+ if(line.indent < ctx.code_indent_offset && ctx.CH(off) == '#') {
+ uint level;
+
+ if(md_is_atxheader_line(ctx, off, &line.beg, &off, &level)) {
+ line.type = MD_LINE_ATXHEADER;
+ line.data = level;
+ break;
+ }
+ }
+
+ /* Check whether we are starting code fence. */
+ if(ctx.CH(off) == '`' || ctx.CH(off) == '~') {
+ if(md_is_opening_code_fence(ctx, off, &off)) {
+ line.type = MD_LINE_FENCEDCODE;
+ line.data = 1;
+ break;
+ }
+ }
+
+ /* Check for start of raw HTML block. */
+ if(ctx.CH(off) == '<' && !(ctx.parser.flags & MD_FLAG_NOHTMLBLOCKS))
+ {
+ ctx.html_block_type = md_is_html_block_start_condition(ctx, off);
+
+ /* HTML block type 7 cannot interrupt paragraph. */
+ if(ctx.html_block_type == 7 && pivot_line.type == MD_LINE_TEXT)
+ ctx.html_block_type = 0;
+
+ if(ctx.html_block_type > 0) {
+ /* The line itself also may immediately close the block. */
+ if(md_is_html_block_end_condition(ctx, off, &off) == ctx.html_block_type) {
+ /* Make sure this is the last line of the block. */
+ ctx.html_block_type = 0;
+ }
+
+ line.type = MD_LINE_HTML;
+ break;
+ }
+ }
+
+ /* Check for table underline. */
+ if((ctx.parser.flags & MD_FLAG_TABLES) && pivot_line.type == MD_LINE_TEXT &&
+ (ctx.CH(off) == '|' || ctx.CH(off) == '-' || ctx.CH(off) == ':') &&
+ n_parents == ctx.n_containers)
+ {
+ uint col_count;
+
+ if(ctx.current_block != null && ctx.current_block.n_lines == 1 &&
+ md_is_table_underline(ctx, off, &off, &col_count) &&
+ md_is_table_row(ctx, pivot_line.beg, null))
+ {
+ line.data = col_count;
+ line.type = MD_LINE_TABLEUNDERLINE;
+ break;
+ }
+ }
+
+ /* By default, we are normal text line. */
+ line.type = MD_LINE_TEXT;
+ if(pivot_line.type == MD_LINE_TEXT && n_brothers + n_children == 0) {
+ /* Lazy continuation. */
+ n_parents = ctx.n_containers;
+ }
+
+ /* Check for task mark. */
+ if((ctx.parser.flags & MD_FLAG_TASKLISTS) && n_brothers + n_children > 0 &&
+ ISANYOF_(ctx.containers[ctx.n_containers-1].ch, "-+*.)"))
+ {
+ OFF tmp = off;
+
+ while(tmp < ctx.size && tmp < off + 3 && ctx.ISBLANK(tmp))
+ tmp++;
+ if(tmp + 2 < ctx.size && ctx.CH(tmp) == '[' &&
+ ctx.ISANYOF(tmp+1, "xX ") && ctx.CH(tmp+2) == ']' &&
+ (tmp + 3 == ctx.size || ctx.ISBLANK(tmp+3) || ctx.ISNEWLINE(tmp+3)))
+ {
+ MD_CONTAINER* task_container = (n_children > 0 ? &ctx.containers[ctx.n_containers-1] : &container);
+ task_container.is_task = TRUE;
+ task_container.task_mark_off = tmp + 1;
+ off = tmp + 3;
+ while(ctx.ISWHITESPACE(off))
+ off++;
+ line.beg = off;
+ }
+ }
+
+ break;
+ }
+
+ /* Scan for end of the line.
+ *
+ * Note this is quite a bottleneck of the parsing as we here iterate almost
+ * over compete document.
+ */
+ {
+ /* Optimization: Use some loop unrolling. */
+ while(off + 3 < ctx.size && !ctx.ISNEWLINE(off+0) && !ctx.ISNEWLINE(off+1)
+ && !ctx.ISNEWLINE(off+2) && !ctx.ISNEWLINE(off+3))
+ off += 4;
+ while(off < ctx.size && !ctx.ISNEWLINE(off))
+ off++;
+ }
+
+ /* Set end of the line. */
+ line.end = off;
+
+ /* But for ATX header, we should exclude the optional trailing mark. */
+ if(line.type == MD_LINE_ATXHEADER) {
+ OFF tmp = line.end;
+ while(tmp > line.beg && ctx.CH(tmp-1) == ' ')
+ tmp--;
+ while(tmp > line.beg && ctx.CH(tmp-1) == '#')
+ tmp--;
+ if(tmp == line.beg || ctx.CH(tmp-1) == ' ' || (ctx.parser.flags & MD_FLAG_PERMISSIVEATXHEADERS))
+ line.end = tmp;
+ }
+
+ /* Trim trailing spaces. */
+ if(line.type != MD_LINE_INDENTEDCODE && line.type != MD_LINE_FENCEDCODE) {
+ while(line.end > line.beg && ctx.CH(line.end-1) == ' ')
+ line.end--;
+ }
+
+ /* Eat also the new line. */
+ if(off < ctx.size && ctx.CH(off) == '\r')
+ off++;
+ if(off < ctx.size && ctx.CH(off) == '\n')
+ off++;
+
+ *p_end = off;
+
+ /* If we belong to a list after seeing a blank line, the list is loose. */
+ if(prev_line_has_list_loosening_effect && line.type != MD_LINE_BLANK && n_parents + n_brothers > 0) {
+ MD_CONTAINER* c = &ctx.containers[n_parents + n_brothers - 1];
+ if(c.ch != '>') {
+ MD_BLOCK* block = cast(MD_BLOCK*) ((cast(char*)ctx.block_bytes) + c.block_byte_off);
+ block.flags = block.flags | MD_BLOCK_LOOSE_LIST;
+ }
+ }
+
+ /* Leave any containers we are not part of anymore. */
+ if(n_children == 0 && n_parents + n_brothers < ctx.n_containers)
+ {
+ ret = (md_leave_child_containers(ctx, n_parents + n_brothers));
+ if (ret < 0) goto abort;
+ }
+
+ /* Enter any container we found a mark for. */
+ if(n_brothers > 0) {
+ assert(n_brothers == 1);
+ ret = (md_push_container_bytes(ctx, MD_BLOCK_LI,
+ ctx.containers[n_parents].task_mark_off,
+ (ctx.containers[n_parents].is_task ? ctx.CH(ctx.containers[n_parents].task_mark_off) : 0),
+ MD_BLOCK_CONTAINER_CLOSER));
+ if (ret < 0) goto abort;
+ ret = (md_push_container_bytes(ctx, MD_BLOCK_LI,
+ container.task_mark_off,
+ (container.is_task ? ctx.CH(container.task_mark_off) : 0),
+ MD_BLOCK_CONTAINER_OPENER));
+ if (ret < 0) goto abort;
+ ctx.containers[n_parents].is_task = container.is_task;
+ ctx.containers[n_parents].task_mark_off = container.task_mark_off;
+ }
+
+ if(n_children > 0)
+ {
+ ret = (md_enter_child_containers(ctx, n_children, line.data));
+ if (ret < 0) goto abort;
+ }
+
+abort:
+ return ret;
+}
+
+int md_process_line(MD_CTX* ctx, const(MD_LINE_ANALYSIS)** p_pivot_line, MD_LINE_ANALYSIS* line)
+{
+ const(MD_LINE_ANALYSIS)* pivot_line = *p_pivot_line;
+ int ret = 0;
+
+ /* Blank line ends current leaf block. */
+ if(line.type == MD_LINE_BLANK) {
+ ret = (md_end_current_block(ctx));
+ if (ret < 0) goto abort;
+ *p_pivot_line = &md_dummy_blank_line;
+ return 0;
+ }
+
+ /* Some line types form block on their own. */
+ if(line.type == MD_LINE_HR || line.type == MD_LINE_ATXHEADER) {
+ ret = (md_end_current_block(ctx));
+ if (ret < 0) goto abort;
+
+ /* Add our single-line block. */
+ ret = (md_start_new_block(ctx, line));
+ if (ret < 0) goto abort;
+ ret = (md_add_line_into_current_block(ctx, line));
+ if (ret < 0) goto abort;
+ ret = (md_end_current_block(ctx));
+ if (ret < 0) goto abort;
+ *p_pivot_line = &md_dummy_blank_line;
+ return 0;
+ }
+
+ /* MD_LINE_SETEXTUNDERLINE changes meaning of the current block and ends it. */
+ if(line.type == MD_LINE_SETEXTUNDERLINE) {
+ assert(ctx.current_block != null);
+ ctx.current_block.type = MD_BLOCK_H;
+ ctx.current_block.data = line.data;
+ ctx.current_block.flags = ctx.current_block.flags | MD_BLOCK_SETEXT_HEADER;
+ ret = (md_add_line_into_current_block(ctx, line));
+ if (ret < 0) goto abort;
+ ret = (md_end_current_block(ctx));
+ if (ret < 0) goto abort;
+ if(ctx.current_block == null) {
+ *p_pivot_line = &md_dummy_blank_line;
+ } else {
+ /* This happens if we have consumed all the body as link ref. defs.
+ * and downgraded the underline into start of a new paragraph block. */
+ line.type = MD_LINE_TEXT;
+ *p_pivot_line = line;
+ }
+ return 0;
+ }
+
+ /* MD_LINE_TABLEUNDERLINE changes meaning of the current block. */
+ if(line.type == MD_LINE_TABLEUNDERLINE) {
+ assert(ctx.current_block != null);
+ assert(ctx.current_block.n_lines == 1);
+ ctx.current_block.type = MD_BLOCK_TABLE;
+ ctx.current_block.data = line.data;
+ assert(pivot_line != &md_dummy_blank_line);
+ (cast(MD_LINE_ANALYSIS*)pivot_line).type = MD_LINE_TABLE;
+ ret = (md_add_line_into_current_block(ctx, line));
+ if (ret < 0) goto abort;
+ return 0;
+ }
+
+ /* The current block also ends if the line has different type. */
+ if(line.type != pivot_line.type)
+ {
+ ret = (md_end_current_block(ctx));
+ if (ret < 0) goto abort;
+ }
+
+ /* The current line may start a new block. */
+ if(ctx.current_block == null) {
+ ret = (md_start_new_block(ctx, line));
+ if (ret < 0) goto abort;
+ *p_pivot_line = line;
+ }
+
+ /* In all other cases the line is just a continuation of the current block. */
+ ret = (md_add_line_into_current_block(ctx, line));
+ if (ret < 0) goto abort;
+
+abort:
+ return ret;
+}
+
+int md_process_doc(MD_CTX *ctx)
+{
+ const(MD_LINE_ANALYSIS)* pivot_line = &md_dummy_blank_line;
+ MD_LINE_ANALYSIS[2] line_buf;
+ MD_LINE_ANALYSIS* line = &line_buf[0];
+ OFF off = 0;
+ int ret = 0;
+
+ ret = MD_ENTER_BLOCK(ctx, MD_BLOCK_DOC, null);
+ if (ret != 0) goto abort;
+
+ while(off < ctx.size) {
+ if(line == pivot_line)
+ line = (line == &line_buf[0] ? &line_buf[1] : &line_buf[0]);
+
+ ret = (md_analyze_line(ctx, off, &off, pivot_line, line));
+ if (ret < 0) goto abort;
+ ret = (md_process_line(ctx, &pivot_line, line));
+ if (ret < 0) goto abort;
+ }
+
+ md_end_current_block(ctx);
+
+ ret = (md_build_ref_def_hashtable(ctx));
+ if (ret < 0) goto abort;
+
+ /* Process all blocks. */
+ ret = (md_leave_child_containers(ctx, 0));
+ if (ret < 0) goto abort;
+ ret = (md_process_all_blocks(ctx));
+ if (ret < 0) goto abort;
+
+ ret = MD_LEAVE_BLOCK(ctx, MD_BLOCK_DOC, null);
+ if (ret != 0) goto abort;
+
+abort:
+
+ debug(bench)
+ /* Output some memory consumption statistics. */
+ {
+ char[256] buffer;
+ sprintf(buffer, "Alloced %u bytes for block buffer.",
+ cast(uint)(ctx.alloc_block_bytes));
+ ctx.MD_LOG(buffer);
+
+ sprintf(buffer, "Alloced %u bytes for containers buffer.",
+ cast(uint)(ctx.alloc_containers * MD_CONTAINER.sizeof));
+ ctx.MD_LOG(buffer);
+
+ sprintf(buffer, "Alloced %u bytes for marks buffer.",
+ cast(uint)(ctx.alloc_marks * MD_MARK.sizeof));
+ ctx.MD_LOG(buffer);
+
+ sprintf(buffer, "Alloced %u bytes for aux. buffer.",
+ cast(uint)(ctx.alloc_buffer * MD_CHAR.sizeof));
+ ctx.MD_LOG(buffer);
+ }
+
+ return ret;
+}
+
+
+/********************
+ *** Public API ***
+ ********************/
+
+/**
+ * Parse the Markdown document stored in the string 'text' of size 'size'.
+ * The renderer provides callbacks to be called during the parsing so the
+ * caller can render the document on the screen or convert the Markdown
+ * to another format.
+ *
+ * Zero is returned on success. If a runtime error occurs (e.g. a memory
+ * fails), -1 is returned. If the processing is aborted due any callback
+ * returning non-zero, md_parse() the return value of the callback is returned.
+ */
+int md_parse(const MD_CHAR* text, MD_SIZE size, const MD_PARSER* parser, void* userdata)
+{
+ MD_CTX ctx;
+ int i;
+ int ret;
+
+ if(parser.abi_version != 0) {
+ if(parser.debug_log != null)
+ parser.debug_log("Unsupported abi_version.", userdata);
+ return -1;
+ }
+
+ /* Setup context structure. */
+ memset(&ctx, 0, MD_CTX.sizeof);
+ ctx.text = text;
+ ctx.size = size;
+ memcpy(&ctx.parser, parser, MD_PARSER.sizeof);
+ ctx.userdata = userdata;
+ ctx.code_indent_offset = (ctx.parser.flags & MD_FLAG_NOINDENTEDCODEBLOCKS) ? cast(OFF)(-1) : 4;
+ md_build_mark_char_map(&ctx);
+ ctx.doc_ends_with_newline = (size > 0 && ISNEWLINE_(text[size-1]));
+
+ /* Reset all unresolved opener mark chains. */
+ for(i = 0; i < cast(int) (ctx.mark_chains.length); i++) {
+ ctx.mark_chains[i].head = -1;
+ ctx.mark_chains[i].tail = -1;
+ }
+ ctx.unresolved_link_head = -1;
+ ctx.unresolved_link_tail = -1;
+
+ /* All the work. */
+ ret = md_process_doc(&ctx);
+
+ /* Clean-up. */
+ md_free_ref_defs(&ctx);
+ md_free_ref_def_hashtable(&ctx);
+ free(ctx.buffer);
+ free(ctx.marks);
+ free(ctx.block_bytes);
+ free(ctx.containers);
+
+ return ret;
+}
+
+//
+// HTML ENTITIES
+//
+
+/* Most entities are formed by single Unicode codepoint, few by two codepoints.
+ * Single-codepoint entities have codepoints[1] set to zero. */
+struct entity
+{
+ const(char)* name;
+ uint[2] codepoints;
+}
+
+/* The table is generated from https://html.spec.whatwg.org/entities.json */
+static immutable entity[] entity_table =
+[
+ entity( "Æ", [ 198, 0 ] ),
+ entity( "&", [ 38, 0 ] ),
+ entity( "Á", [ 193, 0 ] ),
+ entity( "Ă", [ 258, 0 ] ),
+ entity( "Â", [ 194, 0 ] ),
+ entity( "А", [ 1040, 0 ] ),
+ entity( "𝔄", [ 120068, 0 ] ),
+ entity( "À", [ 192, 0 ] ),
+ entity( "Α", [ 913, 0 ] ),
+ entity( "Ā", [ 256, 0 ] ),
+ entity( "⩓", [ 10835, 0 ] ),
+ entity( "Ą", [ 260, 0 ] ),
+ entity( "𝔸", [ 120120, 0 ] ),
+ entity( "⁡", [ 8289, 0 ] ),
+ entity( "Å", [ 197, 0 ] ),
+ entity( "𝒜", [ 119964, 0 ] ),
+ entity( "≔", [ 8788, 0 ] ),
+ entity( "Ã", [ 195, 0 ] ),
+ entity( "Ä", [ 196, 0 ] ),
+ entity( "∖", [ 8726, 0 ] ),
+ entity( "⫧", [ 10983, 0 ] ),
+ entity( "⌆", [ 8966, 0 ] ),
+ entity( "Б", [ 1041, 0 ] ),
+ entity( "∵", [ 8757, 0 ] ),
+ entity( "ℬ", [ 8492, 0 ] ),
+ entity( "Β", [ 914, 0 ] ),
+ entity( "𝔅", [ 120069, 0 ] ),
+ entity( "𝔹", [ 120121, 0 ] ),
+ entity( "˘", [ 728, 0 ] ),
+ entity( "ℬ", [ 8492, 0 ] ),
+ entity( "≎", [ 8782, 0 ] ),
+ entity( "Ч", [ 1063, 0 ] ),
+ entity( "©", [ 169, 0 ] ),
+ entity( "Ć", [ 262, 0 ] ),
+ entity( "⋒", [ 8914, 0 ] ),
+ entity( "ⅅ", [ 8517, 0 ] ),
+ entity( "ℭ", [ 8493, 0 ] ),
+ entity( "Č", [ 268, 0 ] ),
+ entity( "Ç", [ 199, 0 ] ),
+ entity( "Ĉ", [ 264, 0 ] ),
+ entity( "∰", [ 8752, 0 ] ),
+ entity( "Ċ", [ 266, 0 ] ),
+ entity( "¸", [ 184, 0 ] ),
+ entity( "·", [ 183, 0 ] ),
+ entity( "ℭ", [ 8493, 0 ] ),
+ entity( "Χ", [ 935, 0 ] ),
+ entity( "⊙", [ 8857, 0 ] ),
+ entity( "⊖", [ 8854, 0 ] ),
+ entity( "⊕", [ 8853, 0 ] ),
+ entity( "⊗", [ 8855, 0 ] ),
+ entity( "∲", [ 8754, 0 ] ),
+ entity( "”", [ 8221, 0 ] ),
+ entity( "’", [ 8217, 0 ] ),
+ entity( "∷", [ 8759, 0 ] ),
+ entity( "⩴", [ 10868, 0 ] ),
+ entity( "≡", [ 8801, 0 ] ),
+ entity( "∯", [ 8751, 0 ] ),
+ entity( "∮", [ 8750, 0 ] ),
+ entity( "ℂ", [ 8450, 0 ] ),
+ entity( "∐", [ 8720, 0 ] ),
+ entity( "∳", [ 8755, 0 ] ),
+ entity( "⨯", [ 10799, 0 ] ),
+ entity( "𝒞", [ 119966, 0 ] ),
+ entity( "⋓", [ 8915, 0 ] ),
+ entity( "≍", [ 8781, 0 ] ),
+ entity( "ⅅ", [ 8517, 0 ] ),
+ entity( "⤑", [ 10513, 0 ] ),
+ entity( "Ђ", [ 1026, 0 ] ),
+ entity( "Ѕ", [ 1029, 0 ] ),
+ entity( "Џ", [ 1039, 0 ] ),
+ entity( "‡", [ 8225, 0 ] ),
+ entity( "↡", [ 8609, 0 ] ),
+ entity( "⫤", [ 10980, 0 ] ),
+ entity( "Ď", [ 270, 0 ] ),
+ entity( "Д", [ 1044, 0 ] ),
+ entity( "∇", [ 8711, 0 ] ),
+ entity( "Δ", [ 916, 0 ] ),
+ entity( "𝔇", [ 120071, 0 ] ),
+ entity( "´", [ 180, 0 ] ),
+ entity( "˙", [ 729, 0 ] ),
+ entity( "˝", [ 733, 0 ] ),
+ entity( "`", [ 96, 0 ] ),
+ entity( "˜", [ 732, 0 ] ),
+ entity( "⋄", [ 8900, 0 ] ),
+ entity( "ⅆ", [ 8518, 0 ] ),
+ entity( "𝔻", [ 120123, 0 ] ),
+ entity( "¨", [ 168, 0 ] ),
+ entity( "⃜", [ 8412, 0 ] ),
+ entity( "≐", [ 8784, 0 ] ),
+ entity( "∯", [ 8751, 0 ] ),
+ entity( "¨", [ 168, 0 ] ),
+ entity( "⇓", [ 8659, 0 ] ),
+ entity( "⇐", [ 8656, 0 ] ),
+ entity( "⇔", [ 8660, 0 ] ),
+ entity( "⫤", [ 10980, 0 ] ),
+ entity( "⟸", [ 10232, 0 ] ),
+ entity( "⟺", [ 10234, 0 ] ),
+ entity( "⟹", [ 10233, 0 ] ),
+ entity( "⇒", [ 8658, 0 ] ),
+ entity( "⊨", [ 8872, 0 ] ),
+ entity( "⇑", [ 8657, 0 ] ),
+ entity( "⇕", [ 8661, 0 ] ),
+ entity( "∥", [ 8741, 0 ] ),
+ entity( "↓", [ 8595, 0 ] ),
+ entity( "⤓", [ 10515, 0 ] ),
+ entity( "⇵", [ 8693, 0 ] ),
+ entity( "̑", [ 785, 0 ] ),
+ entity( "⥐", [ 10576, 0 ] ),
+ entity( "⥞", [ 10590, 0 ] ),
+ entity( "↽", [ 8637, 0 ] ),
+ entity( "⥖", [ 10582, 0 ] ),
+ entity( "⥟", [ 10591, 0 ] ),
+ entity( "⇁", [ 8641, 0 ] ),
+ entity( "⥗", [ 10583, 0 ] ),
+ entity( "⊤", [ 8868, 0 ] ),
+ entity( "↧", [ 8615, 0 ] ),
+ entity( "⇓", [ 8659, 0 ] ),
+ entity( "𝒟", [ 119967, 0 ] ),
+ entity( "Đ", [ 272, 0 ] ),
+ entity( "Ŋ", [ 330, 0 ] ),
+ entity( "Ð", [ 208, 0 ] ),
+ entity( "É", [ 201, 0 ] ),
+ entity( "Ě", [ 282, 0 ] ),
+ entity( "Ê", [ 202, 0 ] ),
+ entity( "Э", [ 1069, 0 ] ),
+ entity( "Ė", [ 278, 0 ] ),
+ entity( "𝔈", [ 120072, 0 ] ),
+ entity( "È", [ 200, 0 ] ),
+ entity( "∈", [ 8712, 0 ] ),
+ entity( "Ē", [ 274, 0 ] ),
+ entity( "◻", [ 9723, 0 ] ),
+ entity( "▫", [ 9643, 0 ] ),
+ entity( "Ę", [ 280, 0 ] ),
+ entity( "𝔼", [ 120124, 0 ] ),
+ entity( "Ε", [ 917, 0 ] ),
+ entity( "⩵", [ 10869, 0 ] ),
+ entity( "≂", [ 8770, 0 ] ),
+ entity( "⇌", [ 8652, 0 ] ),
+ entity( "ℰ", [ 8496, 0 ] ),
+ entity( "⩳", [ 10867, 0 ] ),
+ entity( "Η", [ 919, 0 ] ),
+ entity( "Ë", [ 203, 0 ] ),
+ entity( "∃", [ 8707, 0 ] ),
+ entity( "ⅇ", [ 8519, 0 ] ),
+ entity( "Ф", [ 1060, 0 ] ),
+ entity( "𝔉", [ 120073, 0 ] ),
+ entity( "◼", [ 9724, 0 ] ),
+ entity( "▪", [ 9642, 0 ] ),
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+ entity( "′", [ 8242, 0 ] ),
+ entity( "ℙ", [ 8473, 0 ] ),
+ entity( "⪵", [ 10933, 0 ] ),
+ entity( "⪹", [ 10937, 0 ] ),
+ entity( "⋨", [ 8936, 0 ] ),
+ entity( "∏", [ 8719, 0 ] ),
+ entity( "⌮", [ 9006, 0 ] ),
+ entity( "⌒", [ 8978, 0 ] ),
+ entity( "⌓", [ 8979, 0 ] ),
+ entity( "∝", [ 8733, 0 ] ),
+ entity( "∝", [ 8733, 0 ] ),
+ entity( "≾", [ 8830, 0 ] ),
+ entity( "⊰", [ 8880, 0 ] ),
+ entity( "𝓅", [ 120005, 0 ] ),
+ entity( "ψ", [ 968, 0 ] ),
+ entity( " ", [ 8200, 0 ] ),
+ entity( "𝔮", [ 120110, 0 ] ),
+ entity( "⨌", [ 10764, 0 ] ),
+ entity( "𝕢", [ 120162, 0 ] ),
+ entity( "⁗", [ 8279, 0 ] ),
+ entity( "𝓆", [ 120006, 0 ] ),
+ entity( "ℍ", [ 8461, 0 ] ),
+ entity( "⨖", [ 10774, 0 ] ),
+ entity( "?", [ 63, 0 ] ),
+ entity( "≟", [ 8799, 0 ] ),
+ entity( """, [ 34, 0 ] ),
+ entity( "⇛", [ 8667, 0 ] ),
+ entity( "⇒", [ 8658, 0 ] ),
+ entity( "⤜", [ 10524, 0 ] ),
+ entity( "⤏", [ 10511, 0 ] ),
+ entity( "⥤", [ 10596, 0 ] ),
+ entity( "∽̱", [ 8765, 817 ] ),
+ entity( "ŕ", [ 341, 0 ] ),
+ entity( "√", [ 8730, 0 ] ),
+ entity( "⦳", [ 10675, 0 ] ),
+ entity( "⟩", [ 10217, 0 ] ),
+ entity( "⦒", [ 10642, 0 ] ),
+ entity( "⦥", [ 10661, 0 ] ),
+ entity( "⟩", [ 10217, 0 ] ),
+ entity( "»", [ 187, 0 ] ),
+ entity( "→", [ 8594, 0 ] ),
+ entity( "⥵", [ 10613, 0 ] ),
+ entity( "⇥", [ 8677, 0 ] ),
+ entity( "⤠", [ 10528, 0 ] ),
+ entity( "⤳", [ 10547, 0 ] ),
+ entity( "⤞", [ 10526, 0 ] ),
+ entity( "↪", [ 8618, 0 ] ),
+ entity( "↬", [ 8620, 0 ] ),
+ entity( "⥅", [ 10565, 0 ] ),
+ entity( "⥴", [ 10612, 0 ] ),
+ entity( "↣", [ 8611, 0 ] ),
+ entity( "↝", [ 8605, 0 ] ),
+ entity( "⤚", [ 10522, 0 ] ),
+ entity( "∶", [ 8758, 0 ] ),
+ entity( "ℚ", [ 8474, 0 ] ),
+ entity( "⤍", [ 10509, 0 ] ),
+ entity( "❳", [ 10099, 0 ] ),
+ entity( "}", [ 125, 0 ] ),
+ entity( "]", [ 93, 0 ] ),
+ entity( "⦌", [ 10636, 0 ] ),
+ entity( "⦎", [ 10638, 0 ] ),
+ entity( "⦐", [ 10640, 0 ] ),
+ entity( "ř", [ 345, 0 ] ),
+ entity( "ŗ", [ 343, 0 ] ),
+ entity( "⌉", [ 8969, 0 ] ),
+ entity( "}", [ 125, 0 ] ),
+ entity( "р", [ 1088, 0 ] ),
+ entity( "⤷", [ 10551, 0 ] ),
+ entity( "⥩", [ 10601, 0 ] ),
+ entity( "”", [ 8221, 0 ] ),
+ entity( "”", [ 8221, 0 ] ),
+ entity( "↳", [ 8627, 0 ] ),
+ entity( "ℜ", [ 8476, 0 ] ),
+ entity( "ℛ", [ 8475, 0 ] ),
+ entity( "ℜ", [ 8476, 0 ] ),
+ entity( "ℝ", [ 8477, 0 ] ),
+ entity( "▭", [ 9645, 0 ] ),
+ entity( "®", [ 174, 0 ] ),
+ entity( "⥽", [ 10621, 0 ] ),
+ entity( "⌋", [ 8971, 0 ] ),
+ entity( "𝔯", [ 120111, 0 ] ),
+ entity( "⇁", [ 8641, 0 ] ),
+ entity( "⇀", [ 8640, 0 ] ),
+ entity( "⥬", [ 10604, 0 ] ),
+ entity( "ρ", [ 961, 0 ] ),
+ entity( "ϱ", [ 1009, 0 ] ),
+ entity( "→", [ 8594, 0 ] ),
+ entity( "↣", [ 8611, 0 ] ),
+ entity( "⇁", [ 8641, 0 ] ),
+ entity( "⇀", [ 8640, 0 ] ),
+ entity( "⇄", [ 8644, 0 ] ),
+ entity( "⇌", [ 8652, 0 ] ),
+ entity( "⇉", [ 8649, 0 ] ),
+ entity( "↝", [ 8605, 0 ] ),
+ entity( "⋌", [ 8908, 0 ] ),
+ entity( "˚", [ 730, 0 ] ),
+ entity( "≓", [ 8787, 0 ] ),
+ entity( "⇄", [ 8644, 0 ] ),
+ entity( "⇌", [ 8652, 0 ] ),
+ entity( "‏", [ 8207, 0 ] ),
+ entity( "⎱", [ 9137, 0 ] ),
+ entity( "⎱", [ 9137, 0 ] ),
+ entity( "⫮", [ 10990, 0 ] ),
+ entity( "⟭", [ 10221, 0 ] ),
+ entity( "⇾", [ 8702, 0 ] ),
+ entity( "⟧", [ 10215, 0 ] ),
+ entity( "⦆", [ 10630, 0 ] ),
+ entity( "𝕣", [ 120163, 0 ] ),
+ entity( "⨮", [ 10798, 0 ] ),
+ entity( "⨵", [ 10805, 0 ] ),
+ entity( ")", [ 41, 0 ] ),
+ entity( "⦔", [ 10644, 0 ] ),
+ entity( "⨒", [ 10770, 0 ] ),
+ entity( "⇉", [ 8649, 0 ] ),
+ entity( "›", [ 8250, 0 ] ),
+ entity( "𝓇", [ 120007, 0 ] ),
+ entity( "↱", [ 8625, 0 ] ),
+ entity( "]", [ 93, 0 ] ),
+ entity( "’", [ 8217, 0 ] ),
+ entity( "’", [ 8217, 0 ] ),
+ entity( "⋌", [ 8908, 0 ] ),
+ entity( "⋊", [ 8906, 0 ] ),
+ entity( "▹", [ 9657, 0 ] ),
+ entity( "⊵", [ 8885, 0 ] ),
+ entity( "▸", [ 9656, 0 ] ),
+ entity( "⧎", [ 10702, 0 ] ),
+ entity( "⥨", [ 10600, 0 ] ),
+ entity( "℞", [ 8478, 0 ] ),
+ entity( "ś", [ 347, 0 ] ),
+ entity( "‚", [ 8218, 0 ] ),
+ entity( "≻", [ 8827, 0 ] ),
+ entity( "⪴", [ 10932, 0 ] ),
+ entity( "⪸", [ 10936, 0 ] ),
+ entity( "š", [ 353, 0 ] ),
+ entity( "≽", [ 8829, 0 ] ),
+ entity( "⪰", [ 10928, 0 ] ),
+ entity( "ş", [ 351, 0 ] ),
+ entity( "ŝ", [ 349, 0 ] ),
+ entity( "⪶", [ 10934, 0 ] ),
+ entity( "⪺", [ 10938, 0 ] ),
+ entity( "⋩", [ 8937, 0 ] ),
+ entity( "⨓", [ 10771, 0 ] ),
+ entity( "≿", [ 8831, 0 ] ),
+ entity( "с", [ 1089, 0 ] ),
+ entity( "⋅", [ 8901, 0 ] ),
+ entity( "⊡", [ 8865, 0 ] ),
+ entity( "⩦", [ 10854, 0 ] ),
+ entity( "⇘", [ 8664, 0 ] ),
+ entity( "⤥", [ 10533, 0 ] ),
+ entity( "↘", [ 8600, 0 ] ),
+ entity( "↘", [ 8600, 0 ] ),
+ entity( "§", [ 167, 0 ] ),
+ entity( ";", [ 59, 0 ] ),
+ entity( "⤩", [ 10537, 0 ] ),
+ entity( "∖", [ 8726, 0 ] ),
+ entity( "∖", [ 8726, 0 ] ),
+ entity( "✶", [ 10038, 0 ] ),
+ entity( "𝔰", [ 120112, 0 ] ),
+ entity( "⌢", [ 8994, 0 ] ),
+ entity( "♯", [ 9839, 0 ] ),
+ entity( "щ", [ 1097, 0 ] ),
+ entity( "ш", [ 1096, 0 ] ),
+ entity( "∣", [ 8739, 0 ] ),
+ entity( "∥", [ 8741, 0 ] ),
+ entity( "­", [ 173, 0 ] ),
+ entity( "σ", [ 963, 0 ] ),
+ entity( "ς", [ 962, 0 ] ),
+ entity( "ς", [ 962, 0 ] ),
+ entity( "∼", [ 8764, 0 ] ),
+ entity( "⩪", [ 10858, 0 ] ),
+ entity( "≃", [ 8771, 0 ] ),
+ entity( "≃", [ 8771, 0 ] ),
+ entity( "⪞", [ 10910, 0 ] ),
+ entity( "⪠", [ 10912, 0 ] ),
+ entity( "⪝", [ 10909, 0 ] ),
+ entity( "⪟", [ 10911, 0 ] ),
+ entity( "≆", [ 8774, 0 ] ),
+ entity( "⨤", [ 10788, 0 ] ),
+ entity( "⥲", [ 10610, 0 ] ),
+ entity( "←", [ 8592, 0 ] ),
+ entity( "∖", [ 8726, 0 ] ),
+ entity( "⨳", [ 10803, 0 ] ),
+ entity( "⧤", [ 10724, 0 ] ),
+ entity( "∣", [ 8739, 0 ] ),
+ entity( "⌣", [ 8995, 0 ] ),
+ entity( "⪪", [ 10922, 0 ] ),
+ entity( "⪬", [ 10924, 0 ] ),
+ entity( "⪬︀", [ 10924, 65024 ] ),
+ entity( "ь", [ 1100, 0 ] ),
+ entity( "/", [ 47, 0 ] ),
+ entity( "⧄", [ 10692, 0 ] ),
+ entity( "⌿", [ 9023, 0 ] ),
+ entity( "𝕤", [ 120164, 0 ] ),
+ entity( "♠", [ 9824, 0 ] ),
+ entity( "♠", [ 9824, 0 ] ),
+ entity( "∥", [ 8741, 0 ] ),
+ entity( "⊓", [ 8851, 0 ] ),
+ entity( "⊓︀", [ 8851, 65024 ] ),
+ entity( "⊔", [ 8852, 0 ] ),
+ entity( "⊔︀", [ 8852, 65024 ] ),
+ entity( "⊏", [ 8847, 0 ] ),
+ entity( "⊑", [ 8849, 0 ] ),
+ entity( "⊏", [ 8847, 0 ] ),
+ entity( "⊑", [ 8849, 0 ] ),
+ entity( "⊐", [ 8848, 0 ] ),
+ entity( "⊒", [ 8850, 0 ] ),
+ entity( "⊐", [ 8848, 0 ] ),
+ entity( "⊒", [ 8850, 0 ] ),
+ entity( "□", [ 9633, 0 ] ),
+ entity( "□", [ 9633, 0 ] ),
+ entity( "▪", [ 9642, 0 ] ),
+ entity( "▪", [ 9642, 0 ] ),
+ entity( "→", [ 8594, 0 ] ),
+ entity( "𝓈", [ 120008, 0 ] ),
+ entity( "∖", [ 8726, 0 ] ),
+ entity( "⌣", [ 8995, 0 ] ),
+ entity( "⋆", [ 8902, 0 ] ),
+ entity( "☆", [ 9734, 0 ] ),
+ entity( "★", [ 9733, 0 ] ),
+ entity( "ϵ", [ 1013, 0 ] ),
+ entity( "ϕ", [ 981, 0 ] ),
+ entity( "¯", [ 175, 0 ] ),
+ entity( "⊂", [ 8834, 0 ] ),
+ entity( "⫅", [ 10949, 0 ] ),
+ entity( "⪽", [ 10941, 0 ] ),
+ entity( "⊆", [ 8838, 0 ] ),
+ entity( "⫃", [ 10947, 0 ] ),
+ entity( "⫁", [ 10945, 0 ] ),
+ entity( "⫋", [ 10955, 0 ] ),
+ entity( "⊊", [ 8842, 0 ] ),
+ entity( "⪿", [ 10943, 0 ] ),
+ entity( "⥹", [ 10617, 0 ] ),
+ entity( "⊂", [ 8834, 0 ] ),
+ entity( "⊆", [ 8838, 0 ] ),
+ entity( "⫅", [ 10949, 0 ] ),
+ entity( "⊊", [ 8842, 0 ] ),
+ entity( "⫋", [ 10955, 0 ] ),
+ entity( "⫇", [ 10951, 0 ] ),
+ entity( "⫕", [ 10965, 0 ] ),
+ entity( "⫓", [ 10963, 0 ] ),
+ entity( "≻", [ 8827, 0 ] ),
+ entity( "⪸", [ 10936, 0 ] ),
+ entity( "≽", [ 8829, 0 ] ),
+ entity( "⪰", [ 10928, 0 ] ),
+ entity( "⪺", [ 10938, 0 ] ),
+ entity( "⪶", [ 10934, 0 ] ),
+ entity( "⋩", [ 8937, 0 ] ),
+ entity( "≿", [ 8831, 0 ] ),
+ entity( "∑", [ 8721, 0 ] ),
+ entity( "♪", [ 9834, 0 ] ),
+ entity( "¹", [185, 0 ] ),
+ entity( "¹", [ 185, 0 ] ),
+ entity( "²", [178, 0 ] ),
+ entity( "²", [ 178, 0 ] ),
+ entity( "³", [179, 0 ] ),
+ entity( "³", [ 179, 0 ] ),
+ entity( "⊃", [ 8835, 0 ] ),
+ entity( "⫆", [ 10950, 0 ] ),
+ entity( "⪾", [ 10942, 0 ] ),
+ entity( "⫘", [ 10968, 0 ] ),
+ entity( "⊇", [ 8839, 0 ] ),
+ entity( "⫄", [ 10948, 0 ] ),
+ entity( "⟉", [ 10185, 0 ] ),
+ entity( "⫗", [ 10967, 0 ] ),
+ entity( "⥻", [ 10619, 0 ] ),
+ entity( "⫂", [ 10946, 0 ] ),
+ entity( "⫌", [ 10956, 0 ] ),
+ entity( "⊋", [ 8843, 0 ] ),
+ entity( "⫀", [ 10944, 0 ] ),
+ entity( "⊃", [ 8835, 0 ] ),
+ entity( "⊇", [ 8839, 0 ] ),
+ entity( "⫆", [ 10950, 0 ] ),
+ entity( "⊋", [ 8843, 0 ] ),
+ entity( "⫌", [ 10956, 0 ] ),
+ entity( "⫈", [ 10952, 0 ] ),
+ entity( "⫔", [ 10964, 0 ] ),
+ entity( "⫖", [ 10966, 0 ] ),
+ entity( "⇙", [ 8665, 0 ] ),
+ entity( "⤦", [ 10534, 0 ] ),
+ entity( "↙", [ 8601, 0 ] ),
+ entity( "↙", [ 8601, 0 ] ),
+ entity( "⤪", [ 10538, 0 ] ),
+ entity( "ß", [ 223, 0 ] ),
+ entity( "⌖", [ 8982, 0 ] ),
+ entity( "τ", [ 964, 0 ] ),
+ entity( "⎴", [ 9140, 0 ] ),
+ entity( "ť", [ 357, 0 ] ),
+ entity( "ţ", [ 355, 0 ] ),
+ entity( "т", [ 1090, 0 ] ),
+ entity( "⃛", [ 8411, 0 ] ),
+ entity( "⌕", [ 8981, 0 ] ),
+ entity( "𝔱", [ 120113, 0 ] ),
+ entity( "∴", [ 8756, 0 ] ),
+ entity( "∴", [ 8756, 0 ] ),
+ entity( "θ", [ 952, 0 ] ),
+ entity( "ϑ", [ 977, 0 ] ),
+ entity( "ϑ", [ 977, 0 ] ),
+ entity( "≈", [ 8776, 0 ] ),
+ entity( "∼", [ 8764, 0 ] ),
+ entity( " ", [ 8201, 0 ] ),
+ entity( "≈", [ 8776, 0 ] ),
+ entity( "∼", [ 8764, 0 ] ),
+ entity( "þ", [ 254, 0 ] ),
+ entity( "˜", [ 732, 0 ] ),
+ entity( "×", [ 215, 0 ] ),
+ entity( "⊠", [ 8864, 0 ] ),
+ entity( "⨱", [ 10801, 0 ] ),
+ entity( "⨰", [ 10800, 0 ] ),
+ entity( "∭", [ 8749, 0 ] ),
+ entity( "⤨", [ 10536, 0 ] ),
+ entity( "⊤", [ 8868, 0 ] ),
+ entity( "⌶", [ 9014, 0 ] ),
+ entity( "⫱", [ 10993, 0 ] ),
+ entity( "𝕥", [ 120165, 0 ] ),
+ entity( "⫚", [ 10970, 0 ] ),
+ entity( "⤩", [ 10537, 0 ] ),
+ entity( "‴", [ 8244, 0 ] ),
+ entity( "™", [ 8482, 0 ] ),
+ entity( "▵", [ 9653, 0 ] ),
+ entity( "▿", [ 9663, 0 ] ),
+ entity( "◃", [ 9667, 0 ] ),
+ entity( "⊴", [ 8884, 0 ] ),
+ entity( "≜", [ 8796, 0 ] ),
+ entity( "▹", [ 9657, 0 ] ),
+ entity( "⊵", [ 8885, 0 ] ),
+ entity( "◬", [ 9708, 0 ] ),
+ entity( "≜", [ 8796, 0 ] ),
+ entity( "⨺", [ 10810, 0 ] ),
+ entity( "⨹", [ 10809, 0 ] ),
+ entity( "⧍", [ 10701, 0 ] ),
+ entity( "⨻", [ 10811, 0 ] ),
+ entity( "⏢", [ 9186, 0 ] ),
+ entity( "𝓉", [ 120009, 0 ] ),
+ entity( "ц", [ 1094, 0 ] ),
+ entity( "ћ", [ 1115, 0 ] ),
+ entity( "ŧ", [ 359, 0 ] ),
+ entity( "≬", [ 8812, 0 ] ),
+ entity( "↞", [ 8606, 0 ] ),
+ entity( "↠", [ 8608, 0 ] ),
+ entity( "⇑", [ 8657, 0 ] ),
+ entity( "⥣", [ 10595, 0 ] ),
+ entity( "ú", [ 250, 0 ] ),
+ entity( "↑", [ 8593, 0 ] ),
+ entity( "ў", [ 1118, 0 ] ),
+ entity( "ŭ", [ 365, 0 ] ),
+ entity( "û", [ 251, 0 ] ),
+ entity( "у", [ 1091, 0 ] ),
+ entity( "⇅", [ 8645, 0 ] ),
+ entity( "ű", [ 369, 0 ] ),
+ entity( "⥮", [ 10606, 0 ] ),
+ entity( "⥾", [ 10622, 0 ] ),
+ entity( "𝔲", [ 120114, 0 ] ),
+ entity( "ù", [ 249, 0 ] ),
+ entity( "↿", [ 8639, 0 ] ),
+ entity( "↾", [ 8638, 0 ] ),
+ entity( "▀", [ 9600, 0 ] ),
+ entity( "⌜", [ 8988, 0 ] ),
+ entity( "⌜", [ 8988, 0 ] ),
+ entity( "⌏", [ 8975, 0 ] ),
+ entity( "◸", [ 9720, 0 ] ),
+ entity( "ū", [ 363, 0 ] ),
+ entity( "¨", [ 168, 0 ] ),
+ entity( "ų", [ 371, 0 ] ),
+ entity( "𝕦", [ 120166, 0 ] ),
+ entity( "↑", [ 8593, 0 ] ),
+ entity( "↕", [ 8597, 0 ] ),
+ entity( "↿", [ 8639, 0 ] ),
+ entity( "↾", [ 8638, 0 ] ),
+ entity( "⊎", [ 8846, 0 ] ),
+ entity( "υ", [ 965, 0 ] ),
+ entity( "ϒ", [ 978, 0 ] ),
+ entity( "υ", [ 965, 0 ] ),
+ entity( "⇈", [ 8648, 0 ] ),
+ entity( "⌝", [ 8989, 0 ] ),
+ entity( "⌝", [ 8989, 0 ] ),
+ entity( "⌎", [ 8974, 0 ] ),
+ entity( "ů", [ 367, 0 ] ),
+ entity( "◹", [ 9721, 0 ] ),
+ entity( "𝓊", [ 120010, 0 ] ),
+ entity( "⋰", [ 8944, 0 ] ),
+ entity( "ũ", [ 361, 0 ] ),
+ entity( "▵", [ 9653, 0 ] ),
+ entity( "▴", [ 9652, 0 ] ),
+ entity( "⇈", [ 8648, 0 ] ),
+ entity( "ü", [ 252, 0 ] ),
+ entity( "⦧", [ 10663, 0 ] ),
+ entity( "⇕", [ 8661, 0 ] ),
+ entity( "⫨", [ 10984, 0 ] ),
+ entity( "⫩", [ 10985, 0 ] ),
+ entity( "⊨", [ 8872, 0 ] ),
+ entity( "⦜", [ 10652, 0 ] ),
+ entity( "ϵ", [ 1013, 0 ] ),
+ entity( "ϰ", [ 1008, 0 ] ),
+ entity( "∅", [ 8709, 0 ] ),
+ entity( "ϕ", [ 981, 0 ] ),
+ entity( "ϖ", [ 982, 0 ] ),
+ entity( "∝", [ 8733, 0 ] ),
+ entity( "↕", [ 8597, 0 ] ),
+ entity( "ϱ", [ 1009, 0 ] ),
+ entity( "ς", [ 962, 0 ] ),
+ entity( "⊊︀", [ 8842, 65024 ] ),
+ entity( "⫋︀", [ 10955, 65024 ] ),
+ entity( "⊋︀", [ 8843, 65024 ] ),
+ entity( "⫌︀", [ 10956, 65024 ] ),
+ entity( "ϑ", [ 977, 0 ] ),
+ entity( "⊲", [ 8882, 0 ] ),
+ entity( "⊳", [ 8883, 0 ] ),
+ entity( "в", [ 1074, 0 ] ),
+ entity( "⊢", [ 8866, 0 ] ),
+ entity( "∨", [ 8744, 0 ] ),
+ entity( "⊻", [ 8891, 0 ] ),
+ entity( "≚", [ 8794, 0 ] ),
+ entity( "⋮", [ 8942, 0 ] ),
+ entity( "|", [ 124, 0 ] ),
+ entity( "|", [ 124, 0 ] ),
+ entity( "𝔳", [ 120115, 0 ] ),
+ entity( "⊲", [ 8882, 0 ] ),
+ entity( "⊂⃒", [ 8834, 8402 ] ),
+ entity( "⊃⃒", [ 8835, 8402 ] ),
+ entity( "𝕧", [ 120167, 0 ] ),
+ entity( "∝", [ 8733, 0 ] ),
+ entity( "⊳", [ 8883, 0 ] ),
+ entity( "𝓋", [ 120011, 0 ] ),
+ entity( "⫋︀", [ 10955, 65024 ] ),
+ entity( "⊊︀", [ 8842, 65024 ] ),
+ entity( "⫌︀", [ 10956, 65024 ] ),
+ entity( "⊋︀", [ 8843, 65024 ] ),
+ entity( "⦚", [ 10650, 0 ] ),
+ entity( "ŵ", [ 373, 0 ] ),
+ entity( "⩟", [ 10847, 0 ] ),
+ entity( "∧", [ 8743, 0 ] ),
+ entity( "≙", [ 8793, 0 ] ),
+ entity( "℘", [ 8472, 0 ] ),
+ entity( "𝔴", [ 120116, 0 ] ),
+ entity( "𝕨", [ 120168, 0 ] ),
+ entity( "℘", [ 8472, 0 ] ),
+ entity( "≀", [ 8768, 0 ] ),
+ entity( "≀", [ 8768, 0 ] ),
+ entity( "𝓌", [ 120012, 0 ] ),
+ entity( "⋂", [ 8898, 0 ] ),
+ entity( "◯", [ 9711, 0 ] ),
+ entity( "⋃", [ 8899, 0 ] ),
+ entity( "▽", [ 9661, 0 ] ),
+ entity( "𝔵", [ 120117, 0 ] ),
+ entity( "⟺", [ 10234, 0 ] ),
+ entity( "⟷", [ 10231, 0 ] ),
+ entity( "ξ", [ 958, 0 ] ),
+ entity( "⟸", [ 10232, 0 ] ),
+ entity( "⟵", [ 10229, 0 ] ),
+ entity( "⟼", [ 10236, 0 ] ),
+ entity( "⋻", [ 8955, 0 ] ),
+ entity( "⨀", [ 10752, 0 ] ),
+ entity( "𝕩", [ 120169, 0 ] ),
+ entity( "⨁", [ 10753, 0 ] ),
+ entity( "⨂", [ 10754, 0 ] ),
+ entity( "⟹", [ 10233, 0 ] ),
+ entity( "⟶", [ 10230, 0 ] ),
+ entity( "𝓍", [ 120013, 0 ] ),
+ entity( "⨆", [ 10758, 0 ] ),
+ entity( "⨄", [ 10756, 0 ] ),
+ entity( "△", [ 9651, 0 ] ),
+ entity( "⋁", [ 8897, 0 ] ),
+ entity( "⋀", [ 8896, 0 ] ),
+ entity( "ý", [ 253, 0 ] ),
+ entity( "я", [ 1103, 0 ] ),
+ entity( "ŷ", [ 375, 0 ] ),
+ entity( "ы", [ 1099, 0 ] ),
+ entity( "¥", [ 165, 0 ] ),
+ entity( "𝔶", [ 120118, 0 ] ),
+ entity( "ї", [ 1111, 0 ] ),
+ entity( "𝕪", [ 120170, 0 ] ),
+ entity( "𝓎", [ 120014, 0 ] ),
+ entity( "ю", [ 1102, 0 ] ),
+ entity( "ÿ", [ 255, 0 ] ),
+ entity( "ź", [ 378, 0 ] ),
+ entity( "ž", [ 382, 0 ] ),
+ entity( "з", [ 1079, 0 ] ),
+ entity( "ż", [ 380, 0 ] ),
+ entity( "ℨ", [ 8488, 0 ] ),
+ entity( "ζ", [ 950, 0 ] ),
+ entity( "𝔷", [ 120119, 0 ] ),
+ entity( "ж", [ 1078, 0 ] ),
+ entity( "⇝", [ 8669, 0 ] ),
+ entity( "𝕫", [ 120171, 0 ] ),
+ entity( "𝓏", [ 120015, 0 ] ),
+ entity( "‍", [ 8205, 0 ] ),
+ entity( "‌", [ 8204, 0 ] ),
+];
+
+
+struct entity_key
+{
+ const(char)* name;
+ size_t name_size;
+}
+
+extern(C) int entity_cmp(scope const(void)* p_key, scope const(void)* p_entity)
+{
+ entity_key* key = cast(entity_key*) p_key;
+ entity* ent = cast(entity*) p_entity;
+ return strncmp(key.name, ent.name, key.name_size);
+}
+
+const(entity)* entity_lookup(const(char)* name, size_t name_size)
+{
+ entity_key key = entity_key(name, name_size);
+ const(void)* result = bsearch(&key, cast(const(void)*)entity_table.ptr, entity_table.length, entity.sizeof, &entity_cmp);
+ return cast(const(entity)*)result;
+}
+
+//
+// HTML RENDERING
+//
+
+/* If set, debug output from md_parse() is sent to stderr. */
+enum MD_RENDER_FLAG_DEBUG = 0x0001;
+
+enum MD_RENDER_FLAG_VERBATIM_ENTITIES = 0x0002;
+
+
+struct MD_RENDER_HTML
+{
+ void function(const(MD_CHAR)*, MD_SIZE, void*) nothrow @nogc process_output;
+ void* userdata;
+ uint flags;
+ int image_nesting_level;
+ char[256] escape_map;
+}
+
+
+/*****************************************
+ *** HTML rendering helper functions ***
+ *****************************************/
+
+/*
+#define ISDIGIT(ch)
+#define ISLOWER(ch)
+#define ISUPPER(ch)
+*/
+bool ISALNUM_HTML(CHAR ch)
+{
+ return ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z') || ('0' <= ch && ch <= '9');
+}
+
+void render_text(MD_RENDER_HTML* r, const(MD_CHAR)* text, MD_SIZE size)
+{
+ r.process_output(text, size, r.userdata);
+}
+
+void RENDER_LITERAL(MD_RENDER_HTML* r, const(MD_CHAR)* literal)
+{
+ render_text(r, literal, cast(uint) strlen(literal));
+}
+
+/* Some characters need to be escaped in normal HTML text. */
+bool HTML_NEED_ESCAPE(MD_RENDER_HTML* r, CHAR ch)
+{
+ return (r.escape_map[cast(ubyte)(ch)] != 0);
+}
+
+void render_html_escaped(MD_RENDER_HTML* r, const MD_CHAR* data, MD_SIZE size)
+{
+ MD_OFFSET beg = 0;
+ MD_OFFSET off = 0;
+
+ while(1) {
+ /* Optimization: Use some loop unrolling. */
+ while(off + 3 < size && !HTML_NEED_ESCAPE(r, data[off+0]) && !HTML_NEED_ESCAPE(r, data[off+1])
+ && !HTML_NEED_ESCAPE(r, data[off+2]) && !HTML_NEED_ESCAPE(r, data[off+3]))
+ off += 4;
+ while(off < size && !HTML_NEED_ESCAPE(r, data[off]))
+ off++;
+
+ if(off > beg)
+ render_text(r, data + beg, off - beg);
+
+ if(off < size) {
+ switch(data[off]) {
+ case '&': RENDER_LITERAL(r, "&"); break;
+ case '<': RENDER_LITERAL(r, "<"); break;
+ case '>': RENDER_LITERAL(r, ">"); break;
+ case '"': RENDER_LITERAL(r, """); break;
+ default: break;
+ }
+ off++;
+ } else {
+ break;
+ }
+ beg = off;
+ }
+}
+
+
+bool URL_NEED_ESCAPE(CHAR ch)
+{
+ return (!ISALNUM_HTML(ch) && strchr("-_.+!*'(),%#@?=;:/,+$", ch) == null);
+}
+
+void render_url_escaped(MD_RENDER_HTML* r, const MD_CHAR* data, MD_SIZE size)
+{
+ static immutable(MD_CHAR)[] hex_chars = "0123456789ABCDEF";
+ MD_OFFSET beg = 0;
+ MD_OFFSET off = 0;
+
+ while(1) {
+ while(off < size && !URL_NEED_ESCAPE(data[off]))
+ off++;
+ if(off > beg)
+ render_text(r, data + beg, off - beg);
+
+ if(off < size) {
+ char[3] hex;
+
+ switch(data[off]) {
+ case '&': RENDER_LITERAL(r, "&"); break;
+ case '\'': RENDER_LITERAL(r, "'"); break;
+ default:
+ hex[0] = '%';
+ hex[1] = hex_chars[(cast(uint)data[off] >> 4) & 0xf];
+ hex[2] = hex_chars[(cast(uint)data[off] >> 0) & 0xf];
+ render_text(r, hex.ptr, 3);
+ break;
+ }
+ off++;
+ } else {
+ break;
+ }
+
+ beg = off;
+ }
+}
+
+uint hex_val(char ch)
+{
+ if('0' <= ch && ch <= '9')
+ return ch - '0';
+ if('A' <= ch && ch <= 'Z')
+ return ch - 'A' + 10;
+ else
+ return ch - 'a' + 10;
+}
+
+alias appendFunc = nothrow @nogc void function(MD_RENDER_HTML*, const(MD_CHAR)*, MD_SIZE);
+
+void render_utf8_codepoint(MD_RENDER_HTML* r, uint codepoint,
+ appendFunc fn_append)
+{
+ static immutable(MD_CHAR)[] utf8_replacement_char = [ 0xef, 0xbf, 0xbd ];
+
+ char[4] utf8;
+ size_t n;
+
+ if(codepoint <= 0x7f) {
+ n = 1;
+ utf8[0] = cast(ubyte) codepoint;
+ } else if(codepoint <= 0x7ff) {
+ n = 2;
+ utf8[0] = 0xc0 | ((codepoint >> 6) & 0x1f);
+ utf8[1] = 0x80 + ((codepoint >> 0) & 0x3f);
+ } else if(codepoint <= 0xffff) {
+ n = 3;
+ utf8[0] = 0xe0 | ((codepoint >> 12) & 0xf);
+ utf8[1] = 0x80 + ((codepoint >> 6) & 0x3f);
+ utf8[2] = 0x80 + ((codepoint >> 0) & 0x3f);
+ } else {
+ n = 4;
+ utf8[0] = 0xf0 | ((codepoint >> 18) & 0x7);
+ utf8[1] = 0x80 + ((codepoint >> 12) & 0x3f);
+ utf8[2] = 0x80 + ((codepoint >> 6) & 0x3f);
+ utf8[3] = 0x80 + ((codepoint >> 0) & 0x3f);
+ }
+
+ if(0 < codepoint && codepoint <= 0x10ffff)
+ fn_append(r, utf8.ptr, cast(uint)n);
+ else
+ fn_append(r, utf8_replacement_char.ptr, 3);
+}
+
+/* Translate entity to its UTF-8 equivalent, or output the verbatim one
+ * if such entity is unknown (or if the translation is disabled). */
+void render_entity(MD_RENDER_HTML* r, const(MD_CHAR)* text, MD_SIZE size,
+ appendFunc fn_append)
+{
+ if(r.flags & MD_RENDER_FLAG_VERBATIM_ENTITIES) {
+ fn_append(r, text, size);
+ return;
+ }
+
+ /* We assume UTF-8 output is what is desired. */
+ if(size > 3 && text[1] == '#') {
+ uint codepoint = 0;
+
+ if(text[2] == 'x' || text[2] == 'X') {
+ /* Hexadecimal entity (e.g. "�")). */
+ MD_SIZE i;
+ for(i = 3; i < size-1; i++)
+ codepoint = 16 * codepoint + hex_val(text[i]);
+ } else {
+ /* Decimal entity (e.g. "&1234;") */
+ MD_SIZE i;
+ for(i = 2; i < size-1; i++)
+ codepoint = 10 * codepoint + (text[i] - '0');
+ }
+
+ render_utf8_codepoint(r, codepoint, fn_append);
+ return;
+ } else {
+ /* Named entity (e.g. " "). */
+ const(entity)* ent;
+
+ ent = entity_lookup(text, size);
+ if(ent != null) {
+ render_utf8_codepoint(r, ent.codepoints[0], fn_append);
+ if(ent.codepoints[1])
+ render_utf8_codepoint(r, ent.codepoints[1], fn_append);
+ return;
+ }
+ }
+
+ fn_append(r, text, size);
+}
+
+void render_attribute(MD_RENDER_HTML* r, const MD_ATTRIBUTE* attr,
+ appendFunc fn_append)
+{
+ int i;
+
+ for(i = 0; attr.substr_offsets[i] < attr.size; i++) {
+ MD_TEXTTYPE type = attr.substr_types[i];
+ MD_OFFSET off = attr.substr_offsets[i];
+ MD_SIZE size = attr.substr_offsets[i+1] - off;
+ const MD_CHAR* text = attr.text + off;
+
+ switch(type) {
+ case MD_TEXT_NULLCHAR: render_utf8_codepoint(r, 0x0000, &render_text); break;
+ case MD_TEXT_ENTITY: render_entity(r, text, size, fn_append); break;
+ default: fn_append(r, text, size); break;
+ }
+ }
+}
+
+
+void render_open_ol_block(MD_RENDER_HTML* r, const(MD_BLOCK_OL_DETAIL)* det)
+{
+ char[64] buf;
+
+ if(det.start == 1) {
+ RENDER_LITERAL(r, "<ol>\n");
+ return;
+ }
+
+ snprintf(buf.ptr, buf.length, "<ol start=\"%u\">\n", det.start);
+ RENDER_LITERAL(r, buf.ptr);
+}
+
+void render_open_li_block(MD_RENDER_HTML* r, const(MD_BLOCK_LI_DETAIL)* det)
+{
+ if(det.is_task) {
+ RENDER_LITERAL(r, "<li class=\"task-list-item\">" ~
+ "<input type=\"checkbox\" class=\"task-list-item-checkbox\" disabled");
+ if(det.task_mark == 'x' || det.task_mark == 'X')
+ RENDER_LITERAL(r, " checked");
+ RENDER_LITERAL(r, ">");
+ } else {
+ RENDER_LITERAL(r, "<li>");
+ }
+}
+
+void render_open_code_block(MD_RENDER_HTML* r, const(MD_BLOCK_CODE_DETAIL)* det)
+{
+ RENDER_LITERAL(r, "<pre><code");
+
+ /* If known, output the HTML 5 attribute class="language-LANGNAME". */
+ if(det.lang.text != null) {
+ RENDER_LITERAL(r, " class=\"language-");
+ render_attribute(r, &det.lang, &render_html_escaped);
+ RENDER_LITERAL(r, "\"");
+ }
+
+ RENDER_LITERAL(r, ">");
+}
+
+void render_open_td_block(MD_RENDER_HTML* r, const(MD_CHAR)* cell_type, const(MD_BLOCK_TD_DETAIL)* det)
+{
+ RENDER_LITERAL(r, "<");
+ RENDER_LITERAL(r, cell_type);
+
+ switch(det.align_)
+ {
+ case MD_ALIGN_LEFT: RENDER_LITERAL(r, " align=\"left\">"); break;
+ case MD_ALIGN_CENTER: RENDER_LITERAL(r, " align=\"center\">"); break;
+ case MD_ALIGN_RIGHT: RENDER_LITERAL(r, " align=\"right\">"); break;
+ default: RENDER_LITERAL(r, ">"); break;
+ }
+}
+
+void render_open_a_span(MD_RENDER_HTML* r, const(MD_SPAN_A_DETAIL)* det)
+{
+ RENDER_LITERAL(r, "<a href=\"");
+ render_attribute(r, &det.href, &render_url_escaped);
+
+ if(det.title.text != null) {
+ RENDER_LITERAL(r, "\" title=\"");
+ render_attribute(r, &det.title, &render_html_escaped);
+ }
+
+ RENDER_LITERAL(r, "\">");
+}
+
+void render_open_img_span(MD_RENDER_HTML* r, const(MD_SPAN_IMG_DETAIL)* det)
+{
+ RENDER_LITERAL(r, "<img src=\"");
+ render_attribute(r, &det.src, &render_url_escaped);
+
+ RENDER_LITERAL(r, "\" alt=\"");
+
+ r.image_nesting_level++;
+}
+
+void render_close_img_span(MD_RENDER_HTML* r, const(MD_SPAN_IMG_DETAIL)* det)
+{
+ if(det.title.text != null) {
+ RENDER_LITERAL(r, "\" title=\"");
+ render_attribute(r, &det.title, &render_html_escaped);
+ }
+ RENDER_LITERAL(r, "\" />");
+ r.image_nesting_level--;
+}
+
+
+/**************************************
+ *** HTML renderer implementation ***
+ **************************************/
+
+int enter_block_callback(MD_BLOCKTYPE type, void* detail, void* userdata)
+{
+ static immutable(MD_CHAR)*[6] head = [ "<h1>", "<h2>", "<h3>", "<h4>", "<h5>", "<h6>" ];
+ MD_RENDER_HTML* r = cast(MD_RENDER_HTML*) userdata;
+
+ switch(type)
+ {
+ case MD_BLOCK_DOC: /* noop */ break;
+ case MD_BLOCK_QUOTE: RENDER_LITERAL(r, "<blockquote>\n"); break;
+ case MD_BLOCK_UL: RENDER_LITERAL(r, "<ul>\n"); break;
+ case MD_BLOCK_OL: render_open_ol_block(r, cast(const(MD_BLOCK_OL_DETAIL)*)detail); break;
+ case MD_BLOCK_LI: render_open_li_block(r, cast(const(MD_BLOCK_LI_DETAIL)*)detail); break;
+ case MD_BLOCK_HR: RENDER_LITERAL(r, "<hr />\n"); break;
+ case MD_BLOCK_H: RENDER_LITERAL(r, head[(cast(MD_BLOCK_H_DETAIL*)detail).level - 1]); break;
+ case MD_BLOCK_CODE: render_open_code_block(r, cast(const(MD_BLOCK_CODE_DETAIL)*) detail); break;
+ case MD_BLOCK_HTML: /* noop */ break;
+ case MD_BLOCK_P: RENDER_LITERAL(r, "<p>"); break;
+ case MD_BLOCK_TABLE: RENDER_LITERAL(r, "<table>\n"); break;
+ case MD_BLOCK_THEAD: RENDER_LITERAL(r, "<thead>\n"); break;
+ case MD_BLOCK_TBODY: RENDER_LITERAL(r, "<tbody>\n"); break;
+ case MD_BLOCK_TR: RENDER_LITERAL(r, "<tr>\n"); break;
+ case MD_BLOCK_TH: render_open_td_block(r, "th", cast(MD_BLOCK_TD_DETAIL*)detail); break;
+ case MD_BLOCK_TD: render_open_td_block(r, "td", cast(MD_BLOCK_TD_DETAIL*)detail); break;
+ default: assert(false);
+ }
+
+ return 0;
+}
+
+int leave_block_callback(MD_BLOCKTYPE type, void* detail, void* userdata)
+{
+ static immutable(MD_CHAR)*[6] head = [ "</h1>\n", "</h2>\n", "</h3>\n", "</h4>\n", "</h5>\n", "</h6>\n" ];
+ MD_RENDER_HTML* r = cast(MD_RENDER_HTML*) userdata;
+
+ switch(type) {
+ case MD_BLOCK_DOC: /*noop*/ break;
+ case MD_BLOCK_QUOTE: RENDER_LITERAL(r, "</blockquote>\n"); break;
+ case MD_BLOCK_UL: RENDER_LITERAL(r, "</ul>\n"); break;
+ case MD_BLOCK_OL: RENDER_LITERAL(r, "</ol>\n"); break;
+ case MD_BLOCK_LI: RENDER_LITERAL(r, "</li>\n"); break;
+ case MD_BLOCK_HR: /*noop*/ break;
+ case MD_BLOCK_H: RENDER_LITERAL(r, head[(cast(MD_BLOCK_H_DETAIL*)detail).level - 1]); break;
+ case MD_BLOCK_CODE: RENDER_LITERAL(r, "</code></pre>\n"); break;
+ case MD_BLOCK_HTML: /* noop */ break;
+ case MD_BLOCK_P: RENDER_LITERAL(r, "</p>\n"); break;
+ case MD_BLOCK_TABLE: RENDER_LITERAL(r, "</table>\n"); break;
+ case MD_BLOCK_THEAD: RENDER_LITERAL(r, "</thead>\n"); break;
+ case MD_BLOCK_TBODY: RENDER_LITERAL(r, "</tbody>\n"); break;
+ case MD_BLOCK_TR: RENDER_LITERAL(r, "</tr>\n"); break;
+ case MD_BLOCK_TH: RENDER_LITERAL(r, "</th>\n"); break;
+ case MD_BLOCK_TD: RENDER_LITERAL(r, "</td>\n"); break;
+ default: assert(false);
+ }
+
+ return 0;
+}
+
+int enter_span_callback(MD_SPANTYPE type, void* detail, void* userdata)
+{
+ MD_RENDER_HTML* r = cast(MD_RENDER_HTML*) userdata;
+
+ if(r.image_nesting_level > 0) {
+ /* We are inside an image, i.e. rendering the ALT attribute of
+ * <IMG> tag. */
+ return 0;
+ }
+
+ switch(type) {
+ case MD_SPAN_EM: RENDER_LITERAL(r, "<em>"); break;
+ case MD_SPAN_STRONG: RENDER_LITERAL(r, "<strong>"); break;
+ case MD_SPAN_A: render_open_a_span(r, cast(MD_SPAN_A_DETAIL*) detail); break;
+ case MD_SPAN_IMG: render_open_img_span(r, cast(MD_SPAN_IMG_DETAIL*) detail); break;
+ case MD_SPAN_CODE: RENDER_LITERAL(r, "<code>"); break;
+ case MD_SPAN_DEL: RENDER_LITERAL(r, "<del>"); break;
+ case MD_SPAN_LATEXMATH: RENDER_LITERAL(r, "<equation>"); break;
+ case MD_SPAN_LATEXMATH_DISPLAY: RENDER_LITERAL(r, "<equation type=\"display\">"); break;
+ default: assert(false);
+ }
+
+ return 0;
+}
+
+int leave_span_callback(MD_SPANTYPE type, void* detail, void* userdata)
+{
+ MD_RENDER_HTML* r = cast(MD_RENDER_HTML*) userdata;
+
+ if(r.image_nesting_level > 0) {
+ /* We are inside an image, i.e. rendering the ALT attribute of
+ * <IMG> tag. */
+ if(r.image_nesting_level == 1 && type == MD_SPAN_IMG)
+ render_close_img_span(r, cast(MD_SPAN_IMG_DETAIL*) detail);
+ return 0;
+ }
+
+ switch(type) {
+ case MD_SPAN_EM: RENDER_LITERAL(r, "</em>"); break;
+ case MD_SPAN_STRONG: RENDER_LITERAL(r, "</strong>"); break;
+ case MD_SPAN_A: RENDER_LITERAL(r, "</a>"); break;
+ case MD_SPAN_IMG: /*noop, handled above*/ break;
+ case MD_SPAN_CODE: RENDER_LITERAL(r, "</code>"); break;
+ case MD_SPAN_DEL: RENDER_LITERAL(r, "</del>"); break;
+ case MD_SPAN_LATEXMATH: /*fall through*/
+ case MD_SPAN_LATEXMATH_DISPLAY: RENDER_LITERAL(r, "</equation>"); break;
+ default: assert(false);
+ }
+
+ return 0;
+}
+
+int text_callback(MD_TEXTTYPE type, const(MD_CHAR)* text, MD_SIZE size, void* userdata)
+{
+ MD_RENDER_HTML* r = cast(MD_RENDER_HTML*) userdata;
+
+ switch(type) {
+ case MD_TEXT_NULLCHAR: render_utf8_codepoint(r, 0x0000, &render_text); break;
+ case MD_TEXT_BR: RENDER_LITERAL(r, (r.image_nesting_level == 0 ? "<br />\n" : " ")); break;
+ case MD_TEXT_SOFTBR: RENDER_LITERAL(r, (r.image_nesting_level == 0 ? "\n" : " ")); break;
+ case MD_TEXT_HTML: render_text(r, text, size); break;
+ case MD_TEXT_ENTITY: render_entity(r, text, size, &render_html_escaped); break;
+ default: render_html_escaped(r, text, size); break;
+ }
+
+ return 0;
+}
+
+void debug_log_callback(const(char)* msg, void* userdata)
+{
+ MD_RENDER_HTML* r = cast(MD_RENDER_HTML*) userdata;
+ if(r.flags & MD_RENDER_FLAG_DEBUG)
+ fprintf(stderr, "MD4C: %s\n", msg);
+}
+
+
+/* Render Markdown into HTML.
+ *
+ * Note only contents of <body> tag is generated. Caller must generate
+ * HTML header/footer manually before/after calling md_render_html().
+ *
+ * Params input and input_size specify the Markdown input.
+ * Callback process_output() gets called with chunks of HTML output.
+ * (Typical implementation may just output the bytes to file or append to
+ * some buffer).
+ * Param userdata is just propagated back to process_output() callback.
+ * Param parser_flags are flags from md4c.h propagated to md_parse().
+ * Param render_flags is bitmask of MD_RENDER_FLAG_xxxx.
+ *
+ * Returns -1 on error (if md_parse() fails.)
+ * Returns 0 on success.
+ */
+int md_render_html(const(MD_CHAR)* input, MD_SIZE input_size,
+ void function(const(MD_CHAR)*, MD_SIZE, void*) nothrow @nogc process_output,
+ void* userdata, uint parser_flags, uint renderer_flags)
+{
+ MD_RENDER_HTML render = MD_RENDER_HTML(process_output, userdata, renderer_flags, 0);
+ render.escape_map[] = '\x00';
+
+ MD_PARSER parser = MD_PARSER(
+ 0,
+ parser_flags,
+ &enter_block_callback,
+ &leave_block_callback,
+ &enter_span_callback,
+ &leave_span_callback,
+ &text_callback,
+ &debug_log_callback,
+ null
+ );
+
+ render.escape_map['"'] = 1;
+ render.escape_map['&'] = 1;
+ render.escape_map['<'] = 1;
+ render.escape_map['>'] = 1;
+
+ return md_parse(input, input_size, &parser, cast(void*) &render);
+}
+