499 lines
13 KiB
C++
Executable File
499 lines
13 KiB
C++
Executable File
// Scintilla source code edit control
|
|
/**
|
|
* @file LexJSON.cxx
|
|
* @date February 19, 2016
|
|
* @brief Lexer for JSON and JSON-LD formats
|
|
* @author nkmathew
|
|
*
|
|
* The License.txt file describes the conditions under which this software may
|
|
* be distributed.
|
|
*
|
|
*/
|
|
|
|
#include <cstdlib>
|
|
#include <cassert>
|
|
#include <cctype>
|
|
#include <cstdio>
|
|
#include <string>
|
|
#include <vector>
|
|
#include <map>
|
|
|
|
#include "ILexer.h"
|
|
#include "Scintilla.h"
|
|
#include "SciLexer.h"
|
|
#include "WordList.h"
|
|
#include "LexAccessor.h"
|
|
#include "StyleContext.h"
|
|
#include "CharacterSet.h"
|
|
#include "LexerModule.h"
|
|
#include "OptionSet.h"
|
|
#include "DefaultLexer.h"
|
|
|
|
using namespace Scintilla;
|
|
|
|
static const char *const JSONWordListDesc[] = {
|
|
"JSON Keywords",
|
|
"JSON-LD Keywords",
|
|
0
|
|
};
|
|
|
|
/**
|
|
* Used to detect compact IRI/URLs in JSON-LD without first looking ahead for the
|
|
* colon separating the prefix and suffix
|
|
*
|
|
* https://www.w3.org/TR/json-ld/#dfn-compact-iri
|
|
*/
|
|
struct CompactIRI {
|
|
int colonCount;
|
|
bool foundInvalidChar;
|
|
CharacterSet setCompactIRI;
|
|
CompactIRI() {
|
|
colonCount = 0;
|
|
foundInvalidChar = false;
|
|
setCompactIRI = CharacterSet(CharacterSet::setAlpha, "$_-");
|
|
}
|
|
void resetState() {
|
|
colonCount = 0;
|
|
foundInvalidChar = false;
|
|
}
|
|
void checkChar(int ch) {
|
|
if (ch == ':') {
|
|
colonCount++;
|
|
} else {
|
|
foundInvalidChar |= !setCompactIRI.Contains(ch);
|
|
}
|
|
}
|
|
bool shouldHighlight() const {
|
|
return !foundInvalidChar && colonCount == 1;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Keeps track of escaped characters in strings as per:
|
|
*
|
|
* https://tools.ietf.org/html/rfc7159#section-7
|
|
*/
|
|
struct EscapeSequence {
|
|
int digitsLeft;
|
|
CharacterSet setHexDigits;
|
|
CharacterSet setEscapeChars;
|
|
EscapeSequence() {
|
|
digitsLeft = 0;
|
|
setHexDigits = CharacterSet(CharacterSet::setDigits, "ABCDEFabcdef");
|
|
setEscapeChars = CharacterSet(CharacterSet::setNone, "\\\"tnbfru/");
|
|
}
|
|
// Returns true if the following character is a valid escaped character
|
|
bool newSequence(int nextChar) {
|
|
digitsLeft = 0;
|
|
if (nextChar == 'u') {
|
|
digitsLeft = 5;
|
|
} else if (!setEscapeChars.Contains(nextChar)) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
bool atEscapeEnd() const {
|
|
return digitsLeft <= 0;
|
|
}
|
|
bool isInvalidChar(int currChar) const {
|
|
return !setHexDigits.Contains(currChar);
|
|
}
|
|
};
|
|
|
|
struct OptionsJSON {
|
|
bool foldCompact;
|
|
bool fold;
|
|
bool allowComments;
|
|
bool escapeSequence;
|
|
OptionsJSON() {
|
|
foldCompact = false;
|
|
fold = false;
|
|
allowComments = false;
|
|
escapeSequence = false;
|
|
}
|
|
};
|
|
|
|
struct OptionSetJSON : public OptionSet<OptionsJSON> {
|
|
OptionSetJSON() {
|
|
DefineProperty("lexer.json.escape.sequence", &OptionsJSON::escapeSequence,
|
|
"Set to 1 to enable highlighting of escape sequences in strings");
|
|
|
|
DefineProperty("lexer.json.allow.comments", &OptionsJSON::allowComments,
|
|
"Set to 1 to enable highlighting of line/block comments in JSON");
|
|
|
|
DefineProperty("fold.compact", &OptionsJSON::foldCompact);
|
|
DefineProperty("fold", &OptionsJSON::fold);
|
|
DefineWordListSets(JSONWordListDesc);
|
|
}
|
|
};
|
|
|
|
class LexerJSON : public DefaultLexer {
|
|
OptionsJSON options;
|
|
OptionSetJSON optSetJSON;
|
|
EscapeSequence escapeSeq;
|
|
WordList keywordsJSON;
|
|
WordList keywordsJSONLD;
|
|
CharacterSet setOperators;
|
|
CharacterSet setURL;
|
|
CharacterSet setKeywordJSONLD;
|
|
CharacterSet setKeywordJSON;
|
|
CompactIRI compactIRI;
|
|
|
|
static bool IsNextNonWhitespace(LexAccessor &styler, Sci_Position start, char ch) {
|
|
Sci_Position i = 0;
|
|
while (i < 50) {
|
|
i++;
|
|
char curr = styler.SafeGetCharAt(start+i, '\0');
|
|
char next = styler.SafeGetCharAt(start+i+1, '\0');
|
|
bool atEOL = (curr == '\r' && next != '\n') || (curr == '\n');
|
|
if (curr == ch) {
|
|
return true;
|
|
} else if (!isspacechar(curr) || atEOL) {
|
|
return false;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Looks for the colon following the end quote
|
|
*
|
|
* Assumes property names of lengths no longer than a 100 characters.
|
|
* The colon is also expected to be less than 50 spaces after the end
|
|
* quote for the string to be considered a property name
|
|
*/
|
|
static bool AtPropertyName(LexAccessor &styler, Sci_Position start) {
|
|
Sci_Position i = 0;
|
|
bool escaped = false;
|
|
while (i < 100) {
|
|
i++;
|
|
char curr = styler.SafeGetCharAt(start+i, '\0');
|
|
if (escaped) {
|
|
escaped = false;
|
|
continue;
|
|
}
|
|
escaped = curr == '\\';
|
|
if (curr == '"') {
|
|
return IsNextNonWhitespace(styler, start+i, ':');
|
|
} else if (!curr) {
|
|
return false;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool IsNextWordInList(WordList &keywordList, CharacterSet wordSet,
|
|
StyleContext &context, LexAccessor &styler) {
|
|
char word[51];
|
|
Sci_Position currPos = (Sci_Position) context.currentPos;
|
|
int i = 0;
|
|
while (i < 50) {
|
|
char ch = styler.SafeGetCharAt(currPos + i);
|
|
if (!wordSet.Contains(ch)) {
|
|
break;
|
|
}
|
|
word[i] = ch;
|
|
i++;
|
|
}
|
|
word[i] = '\0';
|
|
return keywordList.InList(word);
|
|
}
|
|
|
|
public:
|
|
LexerJSON() :
|
|
setOperators(CharacterSet::setNone, "[{}]:,"),
|
|
setURL(CharacterSet::setAlphaNum, "-._~:/?#[]@!$&'()*+,),="),
|
|
setKeywordJSONLD(CharacterSet::setAlpha, ":@"),
|
|
setKeywordJSON(CharacterSet::setAlpha, "$_") {
|
|
}
|
|
virtual ~LexerJSON() {}
|
|
int SCI_METHOD Version() const override {
|
|
return lvOriginal;
|
|
}
|
|
void SCI_METHOD Release() override {
|
|
delete this;
|
|
}
|
|
const char *SCI_METHOD PropertyNames() override {
|
|
return optSetJSON.PropertyNames();
|
|
}
|
|
int SCI_METHOD PropertyType(const char *name) override {
|
|
return optSetJSON.PropertyType(name);
|
|
}
|
|
const char *SCI_METHOD DescribeProperty(const char *name) override {
|
|
return optSetJSON.DescribeProperty(name);
|
|
}
|
|
Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override {
|
|
if (optSetJSON.PropertySet(&options, key, val)) {
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
Sci_Position SCI_METHOD WordListSet(int n, const char *wl) override {
|
|
WordList *wordListN = 0;
|
|
switch (n) {
|
|
case 0:
|
|
wordListN = &keywordsJSON;
|
|
break;
|
|
case 1:
|
|
wordListN = &keywordsJSONLD;
|
|
break;
|
|
}
|
|
Sci_Position firstModification = -1;
|
|
if (wordListN) {
|
|
WordList wlNew;
|
|
wlNew.Set(wl);
|
|
if (*wordListN != wlNew) {
|
|
wordListN->Set(wl);
|
|
firstModification = 0;
|
|
}
|
|
}
|
|
return firstModification;
|
|
}
|
|
void *SCI_METHOD PrivateCall(int, void *) override {
|
|
return 0;
|
|
}
|
|
static ILexer *LexerFactoryJSON() {
|
|
return new LexerJSON;
|
|
}
|
|
const char *SCI_METHOD DescribeWordListSets() override {
|
|
return optSetJSON.DescribeWordListSets();
|
|
}
|
|
void SCI_METHOD Lex(Sci_PositionU startPos,
|
|
Sci_Position length,
|
|
int initStyle,
|
|
IDocument *pAccess) override;
|
|
void SCI_METHOD Fold(Sci_PositionU startPos,
|
|
Sci_Position length,
|
|
int initStyle,
|
|
IDocument *pAccess) override;
|
|
};
|
|
|
|
void SCI_METHOD LexerJSON::Lex(Sci_PositionU startPos,
|
|
Sci_Position length,
|
|
int initStyle,
|
|
IDocument *pAccess) {
|
|
LexAccessor styler(pAccess);
|
|
StyleContext context(startPos, length, initStyle, styler);
|
|
int stringStyleBefore = SCE_JSON_STRING;
|
|
while (context.More()) {
|
|
switch (context.state) {
|
|
case SCE_JSON_BLOCKCOMMENT:
|
|
if (context.Match("*/")) {
|
|
context.Forward();
|
|
context.ForwardSetState(SCE_JSON_DEFAULT);
|
|
}
|
|
break;
|
|
case SCE_JSON_LINECOMMENT:
|
|
if (context.atLineEnd) {
|
|
context.SetState(SCE_JSON_DEFAULT);
|
|
}
|
|
break;
|
|
case SCE_JSON_STRINGEOL:
|
|
if (context.atLineStart) {
|
|
context.SetState(SCE_JSON_DEFAULT);
|
|
}
|
|
break;
|
|
case SCE_JSON_ESCAPESEQUENCE:
|
|
escapeSeq.digitsLeft--;
|
|
if (!escapeSeq.atEscapeEnd()) {
|
|
if (escapeSeq.isInvalidChar(context.ch)) {
|
|
context.SetState(SCE_JSON_ERROR);
|
|
}
|
|
break;
|
|
}
|
|
if (context.ch == '"') {
|
|
context.SetState(stringStyleBefore);
|
|
context.ForwardSetState(SCE_C_DEFAULT);
|
|
} else if (context.ch == '\\') {
|
|
if (!escapeSeq.newSequence(context.chNext)) {
|
|
context.SetState(SCE_JSON_ERROR);
|
|
}
|
|
context.Forward();
|
|
} else {
|
|
context.SetState(stringStyleBefore);
|
|
if (context.atLineEnd) {
|
|
context.ChangeState(SCE_JSON_STRINGEOL);
|
|
}
|
|
}
|
|
break;
|
|
case SCE_JSON_PROPERTYNAME:
|
|
case SCE_JSON_STRING:
|
|
if (context.ch == '"') {
|
|
if (compactIRI.shouldHighlight()) {
|
|
context.ChangeState(SCE_JSON_COMPACTIRI);
|
|
context.ForwardSetState(SCE_JSON_DEFAULT);
|
|
compactIRI.resetState();
|
|
} else {
|
|
context.ForwardSetState(SCE_JSON_DEFAULT);
|
|
}
|
|
} else if (context.atLineEnd) {
|
|
context.ChangeState(SCE_JSON_STRINGEOL);
|
|
} else if (context.ch == '\\') {
|
|
stringStyleBefore = context.state;
|
|
if (options.escapeSequence) {
|
|
context.SetState(SCE_JSON_ESCAPESEQUENCE);
|
|
if (!escapeSeq.newSequence(context.chNext)) {
|
|
context.SetState(SCE_JSON_ERROR);
|
|
}
|
|
}
|
|
context.Forward();
|
|
} else if (context.Match("https://") ||
|
|
context.Match("http://") ||
|
|
context.Match("ssh://") ||
|
|
context.Match("git://") ||
|
|
context.Match("svn://") ||
|
|
context.Match("ftp://") ||
|
|
context.Match("mailto:")) {
|
|
// Handle most common URI schemes only
|
|
stringStyleBefore = context.state;
|
|
context.SetState(SCE_JSON_URI);
|
|
} else if (context.ch == '@') {
|
|
// https://www.w3.org/TR/json-ld/#dfn-keyword
|
|
if (IsNextWordInList(keywordsJSONLD, setKeywordJSONLD, context, styler)) {
|
|
stringStyleBefore = context.state;
|
|
context.SetState(SCE_JSON_LDKEYWORD);
|
|
}
|
|
} else {
|
|
compactIRI.checkChar(context.ch);
|
|
}
|
|
break;
|
|
case SCE_JSON_LDKEYWORD:
|
|
case SCE_JSON_URI:
|
|
if ((!setKeywordJSONLD.Contains(context.ch) &&
|
|
(context.state == SCE_JSON_LDKEYWORD)) ||
|
|
(!setURL.Contains(context.ch))) {
|
|
context.SetState(stringStyleBefore);
|
|
}
|
|
if (context.ch == '"') {
|
|
context.ForwardSetState(SCE_JSON_DEFAULT);
|
|
} else if (context.atLineEnd) {
|
|
context.ChangeState(SCE_JSON_STRINGEOL);
|
|
}
|
|
break;
|
|
case SCE_JSON_OPERATOR:
|
|
case SCE_JSON_NUMBER:
|
|
context.SetState(SCE_JSON_DEFAULT);
|
|
break;
|
|
case SCE_JSON_ERROR:
|
|
if (context.atLineEnd) {
|
|
context.SetState(SCE_JSON_DEFAULT);
|
|
}
|
|
break;
|
|
case SCE_JSON_KEYWORD:
|
|
if (!setKeywordJSON.Contains(context.ch)) {
|
|
context.SetState(SCE_JSON_DEFAULT);
|
|
}
|
|
break;
|
|
}
|
|
if (context.state == SCE_JSON_DEFAULT) {
|
|
if (context.ch == '"') {
|
|
compactIRI.resetState();
|
|
context.SetState(SCE_JSON_STRING);
|
|
Sci_Position currPos = static_cast<Sci_Position>(context.currentPos);
|
|
if (AtPropertyName(styler, currPos)) {
|
|
context.SetState(SCE_JSON_PROPERTYNAME);
|
|
}
|
|
} else if (setOperators.Contains(context.ch)) {
|
|
context.SetState(SCE_JSON_OPERATOR);
|
|
} else if (options.allowComments && context.Match("/*")) {
|
|
context.SetState(SCE_JSON_BLOCKCOMMENT);
|
|
context.Forward();
|
|
} else if (options.allowComments && context.Match("//")) {
|
|
context.SetState(SCE_JSON_LINECOMMENT);
|
|
} else if (setKeywordJSON.Contains(context.ch)) {
|
|
if (IsNextWordInList(keywordsJSON, setKeywordJSON, context, styler)) {
|
|
context.SetState(SCE_JSON_KEYWORD);
|
|
}
|
|
}
|
|
bool numberStart =
|
|
IsADigit(context.ch) && (context.chPrev == '+'||
|
|
context.chPrev == '-' ||
|
|
context.atLineStart ||
|
|
IsASpace(context.chPrev) ||
|
|
setOperators.Contains(context.chPrev));
|
|
bool exponentPart =
|
|
tolower(context.ch) == 'e' &&
|
|
IsADigit(context.chPrev) &&
|
|
(IsADigit(context.chNext) ||
|
|
context.chNext == '+' ||
|
|
context.chNext == '-');
|
|
bool signPart =
|
|
(context.ch == '-' || context.ch == '+') &&
|
|
((tolower(context.chPrev) == 'e' && IsADigit(context.chNext)) ||
|
|
((IsASpace(context.chPrev) || setOperators.Contains(context.chPrev))
|
|
&& IsADigit(context.chNext)));
|
|
bool adjacentDigit =
|
|
IsADigit(context.ch) && IsADigit(context.chPrev);
|
|
bool afterExponent = IsADigit(context.ch) && tolower(context.chPrev) == 'e';
|
|
bool dotPart = context.ch == '.' &&
|
|
IsADigit(context.chPrev) &&
|
|
IsADigit(context.chNext);
|
|
bool afterDot = IsADigit(context.ch) && context.chPrev == '.';
|
|
if (numberStart ||
|
|
exponentPart ||
|
|
signPart ||
|
|
adjacentDigit ||
|
|
dotPart ||
|
|
afterExponent ||
|
|
afterDot) {
|
|
context.SetState(SCE_JSON_NUMBER);
|
|
} else if (context.state == SCE_JSON_DEFAULT && !IsASpace(context.ch)) {
|
|
context.SetState(SCE_JSON_ERROR);
|
|
}
|
|
}
|
|
context.Forward();
|
|
}
|
|
context.Complete();
|
|
}
|
|
|
|
void SCI_METHOD LexerJSON::Fold(Sci_PositionU startPos,
|
|
Sci_Position length,
|
|
int,
|
|
IDocument *pAccess) {
|
|
if (!options.fold) {
|
|
return;
|
|
}
|
|
LexAccessor styler(pAccess);
|
|
Sci_PositionU currLine = styler.GetLine(startPos);
|
|
Sci_PositionU endPos = startPos + length;
|
|
int currLevel = SC_FOLDLEVELBASE;
|
|
if (currLine > 0)
|
|
currLevel = styler.LevelAt(currLine - 1) >> 16;
|
|
int nextLevel = currLevel;
|
|
int visibleChars = 0;
|
|
for (Sci_PositionU i = startPos; i < endPos; i++) {
|
|
char curr = styler.SafeGetCharAt(i);
|
|
char next = styler.SafeGetCharAt(i+1);
|
|
bool atEOL = (curr == '\r' && next != '\n') || (curr == '\n');
|
|
if (styler.StyleAt(i) == SCE_JSON_OPERATOR) {
|
|
if (curr == '{' || curr == '[') {
|
|
nextLevel++;
|
|
} else if (curr == '}' || curr == ']') {
|
|
nextLevel--;
|
|
}
|
|
}
|
|
if (atEOL || i == (endPos-1)) {
|
|
int level = currLevel | nextLevel << 16;
|
|
if (!visibleChars && options.foldCompact) {
|
|
level |= SC_FOLDLEVELWHITEFLAG;
|
|
} else if (nextLevel > currLevel) {
|
|
level |= SC_FOLDLEVELHEADERFLAG;
|
|
}
|
|
if (level != styler.LevelAt(currLine)) {
|
|
styler.SetLevel(currLine, level);
|
|
}
|
|
currLine++;
|
|
currLevel = nextLevel;
|
|
visibleChars = 0;
|
|
}
|
|
if (!isspacechar(curr)) {
|
|
visibleChars++;
|
|
}
|
|
}
|
|
}
|
|
|
|
LexerModule lmJSON(SCLEX_JSON,
|
|
LexerJSON::LexerFactoryJSON,
|
|
"json",
|
|
JSONWordListDesc);
|