mirror of https://github.com/buggins/dlangui.git
CSS parser
This commit is contained in:
Vadim Lopatin
parent
ac2abfba54
commit
3d338b86b0
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@ -204,9 +204,9 @@ enum CssDeclType : ubyte {
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text_align_last,
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text_decoration,
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hyphenate, // hyphenate
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hyphenate2, // -webkit-hyphens
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hyphenate3, // adobe-hyphenate
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hyphenate4, // adobe-text-layout
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_webkit_hyphens, // -webkit-hyphens
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adobe_hyphenate, // adobe-hyphenate
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adobe_text_layout, // adobe-text-layout
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color,
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background_color,
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vertical_align,
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@ -236,9 +236,16 @@ enum CssDeclType : ubyte {
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list_style,
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list_style_type,
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list_style_position,
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list_style_image,
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stop,
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eol
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list_style_image
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}
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class CssStyle {
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CssDisplay display = CssDisplay.block;
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CssWhiteSpace whiteSpace = CssWhiteSpace.inherit;
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CssTextAlign textAlign = CssTextAlign.inherit;
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CssTextAlign textAlignLast = CssTextAlign.inherit;
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CssTextDecoration textDecoration = CssTextDecoration.inherit;
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CssHyphenate hyphenate = CssHyphenate.inherit;
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}
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/// skip spaces, move to new location, return true if there are some characters left in source line
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@ -281,7 +288,7 @@ private string parseIdent(ref string src) {
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private bool skipChar(ref string src, char ch) {
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skipSpaces(src);
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if (src.length > 0 && src[0] == ':') {
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if (src.length > 0 && src[0] == ch) {
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src = src[1 .. $];
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skipSpaces(src);
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return true;
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@ -289,7 +296,7 @@ private bool skipChar(ref string src, char ch) {
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return false;
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}
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string replaceChar(string s, char from, char to) {
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private string replaceChar(string s, char from, char to) {
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foreach(ch; s) {
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if (ch == from) {
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char[] buf;
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@ -304,141 +311,230 @@ string replaceChar(string s, char from, char to) {
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return s;
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}
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/// remove trailing _ from string, e.g. "body_" -> "body"
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private string removeTrailingUnderscore(string s) {
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if (s.endsWith("_"))
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return s[0..$-1];
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return s;
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}
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private int parseEnumItem(E)(ref string src, int defValue = -1) if (is(E == enum)) {
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string ident = replaceChar(parseIdent(src), '_', '-');
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string ident = replaceChar(parseIdent(src), '-', '_');
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foreach(member; EnumMembers!E) {
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if (member.to!string.equal(ident))
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return member;
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if (ident == removeTrailingUnderscore(member.to!string)) {
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return member.to!int;
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}
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}
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return defValue;
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}
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private CssDeclType parseCssDeclType(ref string src) {
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string ident = parseIdent(src);
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if (ident.empty)
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int n = parseEnumItem!CssDeclType(src, -1);
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if (n < 0)
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return CssDeclType.unknown;
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if (!skipChar(src, ':')) // no : after identifier
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return CssDeclType.unknown;
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switch(ident) with (CssDeclType) {
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case "display": return display;
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case "white-space": return white_space;
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case "text-align": return text_align;
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case "text-align-last": return text_align_last;
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case "text-decoration": return text_decoration;
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case "hyphenate": return hyphenate; // hyphenate
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case "-webkit-hyphens": return hyphenate2; // -webkit-hyphens
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case "-adobe-hyphenate": return hyphenate3; // adobe-hyphenate
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case "-adobe-text-layout": return hyphenate4; // adobe-text-layout
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case "color": return color;
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case "background-color": return background_color;
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case "vertical-align": return vertical_align;
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case "font-family": return font_family; // id families like serif; sans-serif
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case "font-names": return font_names; // string font name like Arial; Courier
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case "font-size": return font_size;
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case "font-style": return font_style;
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case "font-weight": return font_weight;
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case "text-indent": return text_indent;
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case "line-height": return line_height;
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case "letter-spacing": return letter_spacing;
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case "width": return width;
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case "height": return height;
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case "margin-left": return margin_left;
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case "margin-right": return margin_right;
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case "margin-top": return margin_top;
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case "margin-bottom": return margin_bottom;
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case "margin": return margin;
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case "padding-left": return padding_left;
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case "padding-right": return padding_right;
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case "padding-top": return padding_top;
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case "padding-bottom": return padding_bottom;
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case "padding": return padding;
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case "page-break-before": return page_break_before;
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case "page-break-after": return page_break_after;
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case "page-break-inside": return page_break_inside;
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case "list-style": return list_style;
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case "list-style-type": return list_style_type;
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case "list-style-position": return list_style_position;
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case "list-style-image": return list_style_image;
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default:
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return CssDeclType.unknown;
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}
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return cast(CssDeclType)n;
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}
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class CssDeclaration {
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bool parse(ref string src) {
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if (!skipSpaces(src))
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return false;
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if (!skipChar(src, '{'))
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return false; // decl must start with {
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CssDeclType propId = parseCssDeclType(src);
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int n = -1;
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switch(propId) with(CssDeclType) {
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case display: n = parseEnumItem!CssDisplay(src, -1); break;
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case white_space: n = parseEnumItem!CssWhiteSpace(src, -1); break;
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case text_align: n = parseEnumItem!CssTextAlign(src, -1); break;
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case text_align_last: n = parseEnumItem!CssTextAlign(src, -1); break;
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case text_decoration: n = parseEnumItem!CssTextDecoration(src, -1); break;
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private bool nextProperty(ref string str) {
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int pos = 0;
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for (; pos < str.length; pos++) {
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char ch = str[pos];
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if (ch == '}')
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break;
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if (ch == ';') {
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pos++;
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break;
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}
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}
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str = pos < str.length ? str[pos .. $] : null;
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skipSpaces(str);
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return !str.empty && str[0] != '}';
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}
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struct CssDeclItem {
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CssDeclType type;
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int value;
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string str;
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void apply(CssStyle style) {
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switch (type) with (CssDeclType) {
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case display: style.display = cast(CssDisplay)value; break;
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case white_space: style.whiteSpace = cast(CssWhiteSpace)value; break;
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case text_align: style.textAlign = cast(CssTextAlign)value; break;
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case text_align_last: style.textAlignLast = cast(CssTextAlign)value; break;
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case text_decoration: style.textDecoration = cast(CssTextDecoration)value; break;
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case _webkit_hyphens: // -webkit-hyphens
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case adobe_hyphenate: // adobe-hyphenate
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case adobe_text_layout: // adobe-text-layout
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case hyphenate:
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case hyphenate2:
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case hyphenate3:
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case hyphenate4:
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n = parseEnumItem!CssHyphenate(src, -1);
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style.hyphenate = cast(CssHyphenate)value;
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break; // hyphenate
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case color:
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//n = parseEnumItem!Css(src, -1);
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break;
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case background_color:
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//n = parseEnumItem!Css(src, -1);
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break;
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case vertical_align: n = parseEnumItem!CssVerticalAlign(src, -1); break;
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case font_family: n = parseEnumItem!CssFontFamily(src, -1); break; // id families like serif, sans-serif
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case font_names:
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//n = parseEnumItem!Css(src, -1);
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break; // string font name like Arial, Courier
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case font_size:
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//n = parseEnumItem!Css(src, -1);
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break;
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case font_style: n = parseEnumItem!CssFontStyle(src, -1); break;
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case font_weight:
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//n = parseEnumItem!Css(src, -1);
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break;
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case text_indent:
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//n = parseEnumItem!CssTextIndent(src, -1);
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break;
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case line_height:
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case letter_spacing:
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case width:
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case height:
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case margin_left:
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case margin_right:
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case margin_top:
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case margin_bottom:
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case padding_left:
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case padding_right:
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case padding_top:
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case padding_bottom:
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//n = parseEnumItem!Css(src, -1);
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break;
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case margin:
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case padding:
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//n = parseEnumItem!Css(src, -1);
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break;
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case page_break_before:
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case page_break_inside:
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case page_break_after:
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n = parseEnumItem!CssPageBreak(src, -1);
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break;
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case list_style:
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//n = parseEnumItem!Css(src, -1);
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break;
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case list_style_type: n = parseEnumItem!CssListStyleType(src, -1); break;
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case list_style_position: n = parseEnumItem!CssListStylePosition(src, -1); break;
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case list_style_image:
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//n = parseEnumItem!CssListStyleImage(src, -1);
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break;
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case color: break;
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case background_color: break;
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case vertical_align: break;
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case font_family: break; // id families like serif, sans-serif
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case font_names: break; // string font name like Arial, Courier
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case font_size: break;
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case font_style: break;
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case font_weight: break;
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case text_indent: break;
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case line_height: break;
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case letter_spacing: break;
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case width: break;
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case height: break;
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case margin_left: break;
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case margin_right: break;
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case margin_top: break;
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case margin_bottom: break;
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case margin: break;
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case padding_left: break;
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case padding_right: break;
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case padding_top: break;
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case padding_bottom: break;
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case padding: break;
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case page_break_before: break;
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case page_break_after: break;
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case page_break_inside: break;
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case list_style: break;
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case list_style_type: break;
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case list_style_position: break;
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case list_style_image: break;
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default:
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break;
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}
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return true;
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}
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}
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/// css declaration like { display: block; margin-top: 10px }
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class CssDeclaration {
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private CssDeclItem[] _list;
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void apply(CssStyle style) {
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foreach(item; _list)
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item.apply(style);
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}
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bool parse(ref string src, bool mustBeInBrackets = true) {
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if (!skipSpaces(src))
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return false;
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if (mustBeInBrackets && !skipChar(src, '{'))
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return false; // decl must start with {
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for (;;) {
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CssDeclType propId = parseCssDeclType(src);
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if (propId != CssDeclType.unknown) {
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int n = -1;
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string s = null;
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switch(propId) with(CssDeclType) {
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case display: n = parseEnumItem!CssDisplay(src, -1); break;
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case white_space: n = parseEnumItem!CssWhiteSpace(src, -1); break;
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case text_align: n = parseEnumItem!CssTextAlign(src, -1); break;
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case text_align_last: n = parseEnumItem!CssTextAlign(src, -1); break;
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case text_decoration: n = parseEnumItem!CssTextDecoration(src, -1); break;
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case hyphenate:
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case _webkit_hyphens: // -webkit-hyphens
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case adobe_hyphenate: // adobe-hyphenate
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case adobe_text_layout: // adobe-text-layout
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n = parseEnumItem!CssHyphenate(src, -1);
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break; // hyphenate
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case color:
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//n = parseEnumItem!Css(src, -1);
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break;
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case background_color:
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//n = parseEnumItem!Css(src, -1);
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break;
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case vertical_align: n = parseEnumItem!CssVerticalAlign(src, -1); break;
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case font_family: n = parseEnumItem!CssFontFamily(src, -1); break; // id families like serif, sans-serif
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case font_names:
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//n = parseEnumItem!Css(src, -1);
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break; // string font name like Arial, Courier
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case font_size:
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//n = parseEnumItem!Css(src, -1);
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break;
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case font_style: n = parseEnumItem!CssFontStyle(src, -1); break;
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case font_weight:
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//n = parseEnumItem!Css(src, -1);
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break;
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case text_indent:
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//n = parseEnumItem!CssTextIndent(src, -1);
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break;
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case line_height:
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case letter_spacing:
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case width:
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case height:
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case margin_left:
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case margin_right:
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case margin_top:
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case margin_bottom:
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case padding_left:
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case padding_right:
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case padding_top:
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case padding_bottom:
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//n = parseEnumItem!Css(src, -1);
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break;
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case margin:
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case padding:
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//n = parseEnumItem!Css(src, -1);
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break;
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case page_break_before:
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case page_break_inside:
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case page_break_after:
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n = parseEnumItem!CssPageBreak(src, -1);
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break;
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case list_style:
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//n = parseEnumItem!Css(src, -1);
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break;
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case list_style_type: n = parseEnumItem!CssListStyleType(src, -1); break;
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case list_style_position: n = parseEnumItem!CssListStylePosition(src, -1); break;
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case list_style_image:
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//n = parseEnumItem!CssListStyleImage(src, -1);
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break;
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default:
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break;
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}
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if (n >= 0 || !s.empty) {
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CssDeclItem item;
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item.type = propId;
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item.value = n;
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item.str = s;
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_list ~= item;
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}
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}
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if (!nextProperty(src))
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break;
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}
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if (mustBeInBrackets && !skipChar(src, '}'))
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return false;
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return _list.length > 0;
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}
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}
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version(unittest) {
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void testCSS() {
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CssStyle style = new CssStyle();
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CssDeclaration decl = new CssDeclaration();
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CssWhiteSpace whiteSpace = CssWhiteSpace.inherit;
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CssTextAlign textAlign = CssTextAlign.inherit;
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CssTextAlign textAlignLast = CssTextAlign.inherit;
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CssTextDecoration textDecoration = CssTextDecoration.inherit;
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CssHyphenate hyphenate = CssHyphenate.inherit;
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string src = "{ display: inline; text-decoration: underline; white-space: pre; text-align: right; text-align-last: left; hyphenate: auto }";
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assert(decl.parse(src, true));
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assert(style.display == CssDisplay.block);
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assert(style.textDecoration == CssTextDecoration.inherit);
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assert(style.whiteSpace == CssWhiteSpace.inherit);
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assert(style.textAlign == CssTextAlign.inherit);
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assert(style.textAlignLast == CssTextAlign.inherit);
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assert(style.hyphenate == CssHyphenate.inherit);
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decl.apply(style);
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assert(style.display == CssDisplay.inline);
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assert(style.textDecoration == CssTextDecoration.underline);
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assert(style.whiteSpace == CssWhiteSpace.pre);
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assert(style.textAlign == CssTextAlign.right);
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assert(style.textAlignLast == CssTextAlign.left);
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assert(style.hyphenate == CssHyphenate.auto_);
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}
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}
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