499 lines
13 KiB
C++
499 lines
13 KiB
C++
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// Scintilla source code edit control
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/**
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* @file LexJSON.cxx
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* @date February 19, 2016
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* @brief Lexer for JSON and JSON-LD formats
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* @author nkmathew
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*
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* The License.txt file describes the conditions under which this software may
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* be distributed.
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*
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*/
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#include <cstdlib>
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#include <cassert>
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#include <cctype>
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#include <cstdio>
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#include <string>
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#include <vector>
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#include <map>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#include "OptionSet.h"
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#include "DefaultLexer.h"
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using namespace Scintilla;
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static const char *const JSONWordListDesc[] = {
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"JSON Keywords",
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"JSON-LD Keywords",
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0
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};
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/**
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* Used to detect compact IRI/URLs in JSON-LD without first looking ahead for the
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* colon separating the prefix and suffix
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*
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* https://www.w3.org/TR/json-ld/#dfn-compact-iri
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*/
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struct CompactIRI {
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int colonCount;
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bool foundInvalidChar;
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CharacterSet setCompactIRI;
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CompactIRI() {
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colonCount = 0;
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foundInvalidChar = false;
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setCompactIRI = CharacterSet(CharacterSet::setAlpha, "$_-");
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}
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void resetState() {
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colonCount = 0;
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foundInvalidChar = false;
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}
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void checkChar(int ch) {
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if (ch == ':') {
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colonCount++;
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} else {
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foundInvalidChar |= !setCompactIRI.Contains(ch);
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}
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}
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bool shouldHighlight() const {
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return !foundInvalidChar && colonCount == 1;
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}
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};
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/**
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* Keeps track of escaped characters in strings as per:
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*
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* https://tools.ietf.org/html/rfc7159#section-7
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*/
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struct EscapeSequence {
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int digitsLeft;
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CharacterSet setHexDigits;
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CharacterSet setEscapeChars;
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EscapeSequence() {
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digitsLeft = 0;
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setHexDigits = CharacterSet(CharacterSet::setDigits, "ABCDEFabcdef");
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setEscapeChars = CharacterSet(CharacterSet::setNone, "\\\"tnbfru/");
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}
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// Returns true if the following character is a valid escaped character
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bool newSequence(int nextChar) {
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digitsLeft = 0;
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if (nextChar == 'u') {
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digitsLeft = 5;
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} else if (!setEscapeChars.Contains(nextChar)) {
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return false;
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}
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return true;
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}
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bool atEscapeEnd() const {
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return digitsLeft <= 0;
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}
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bool isInvalidChar(int currChar) const {
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return !setHexDigits.Contains(currChar);
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}
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};
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struct OptionsJSON {
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bool foldCompact;
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bool fold;
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bool allowComments;
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bool escapeSequence;
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OptionsJSON() {
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foldCompact = false;
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fold = false;
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allowComments = false;
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escapeSequence = false;
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}
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};
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struct OptionSetJSON : public OptionSet<OptionsJSON> {
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OptionSetJSON() {
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DefineProperty("lexer.json.escape.sequence", &OptionsJSON::escapeSequence,
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"Set to 1 to enable highlighting of escape sequences in strings");
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DefineProperty("lexer.json.allow.comments", &OptionsJSON::allowComments,
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"Set to 1 to enable highlighting of line/block comments in JSON");
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DefineProperty("fold.compact", &OptionsJSON::foldCompact);
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DefineProperty("fold", &OptionsJSON::fold);
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DefineWordListSets(JSONWordListDesc);
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}
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};
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class LexerJSON : public DefaultLexer {
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OptionsJSON options;
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OptionSetJSON optSetJSON;
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EscapeSequence escapeSeq;
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WordList keywordsJSON;
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WordList keywordsJSONLD;
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CharacterSet setOperators;
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CharacterSet setURL;
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CharacterSet setKeywordJSONLD;
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CharacterSet setKeywordJSON;
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CompactIRI compactIRI;
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static bool IsNextNonWhitespace(LexAccessor &styler, Sci_Position start, char ch) {
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Sci_Position i = 0;
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while (i < 50) {
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i++;
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char curr = styler.SafeGetCharAt(start+i, '\0');
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char next = styler.SafeGetCharAt(start+i+1, '\0');
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bool atEOL = (curr == '\r' && next != '\n') || (curr == '\n');
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if (curr == ch) {
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return true;
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} else if (!isspacechar(curr) || atEOL) {
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return false;
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}
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}
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return false;
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}
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/**
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* Looks for the colon following the end quote
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*
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* Assumes property names of lengths no longer than a 100 characters.
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* The colon is also expected to be less than 50 spaces after the end
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* quote for the string to be considered a property name
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*/
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static bool AtPropertyName(LexAccessor &styler, Sci_Position start) {
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Sci_Position i = 0;
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bool escaped = false;
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while (i < 100) {
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i++;
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char curr = styler.SafeGetCharAt(start+i, '\0');
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if (escaped) {
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escaped = false;
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continue;
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}
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escaped = curr == '\\';
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if (curr == '"') {
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return IsNextNonWhitespace(styler, start+i, ':');
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} else if (!curr) {
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return false;
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}
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}
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return false;
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}
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static bool IsNextWordInList(WordList &keywordList, CharacterSet wordSet,
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StyleContext &context, LexAccessor &styler) {
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char word[51];
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Sci_Position currPos = (Sci_Position) context.currentPos;
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int i = 0;
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while (i < 50) {
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char ch = styler.SafeGetCharAt(currPos + i);
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if (!wordSet.Contains(ch)) {
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break;
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}
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word[i] = ch;
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i++;
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}
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word[i] = '\0';
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return keywordList.InList(word);
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}
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public:
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LexerJSON() :
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setOperators(CharacterSet::setNone, "[{}]:,"),
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setURL(CharacterSet::setAlphaNum, "-._~:/?#[]@!$&'()*+,),="),
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setKeywordJSONLD(CharacterSet::setAlpha, ":@"),
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setKeywordJSON(CharacterSet::setAlpha, "$_") {
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}
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virtual ~LexerJSON() {}
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int SCI_METHOD Version() const override {
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return lvRelease4;
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}
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void SCI_METHOD Release() override {
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delete this;
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}
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const char *SCI_METHOD PropertyNames() override {
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return optSetJSON.PropertyNames();
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}
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int SCI_METHOD PropertyType(const char *name) override {
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return optSetJSON.PropertyType(name);
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}
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const char *SCI_METHOD DescribeProperty(const char *name) override {
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return optSetJSON.DescribeProperty(name);
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}
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Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override {
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if (optSetJSON.PropertySet(&options, key, val)) {
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return 0;
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}
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return -1;
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}
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Sci_Position SCI_METHOD WordListSet(int n, const char *wl) override {
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WordList *wordListN = 0;
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switch (n) {
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case 0:
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wordListN = &keywordsJSON;
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break;
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case 1:
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wordListN = &keywordsJSONLD;
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break;
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}
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Sci_Position firstModification = -1;
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if (wordListN) {
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WordList wlNew;
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wlNew.Set(wl);
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if (*wordListN != wlNew) {
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wordListN->Set(wl);
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firstModification = 0;
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}
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}
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return firstModification;
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}
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void *SCI_METHOD PrivateCall(int, void *) override {
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return 0;
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}
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static ILexer4 *LexerFactoryJSON() {
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return new LexerJSON;
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}
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const char *SCI_METHOD DescribeWordListSets() override {
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return optSetJSON.DescribeWordListSets();
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}
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void SCI_METHOD Lex(Sci_PositionU startPos,
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Sci_Position length,
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int initStyle,
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IDocument *pAccess) override;
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void SCI_METHOD Fold(Sci_PositionU startPos,
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Sci_Position length,
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int initStyle,
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IDocument *pAccess) override;
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};
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void SCI_METHOD LexerJSON::Lex(Sci_PositionU startPos,
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Sci_Position length,
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int initStyle,
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IDocument *pAccess) {
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LexAccessor styler(pAccess);
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StyleContext context(startPos, length, initStyle, styler);
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int stringStyleBefore = SCE_JSON_STRING;
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while (context.More()) {
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switch (context.state) {
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case SCE_JSON_BLOCKCOMMENT:
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if (context.Match("*/")) {
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context.Forward();
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context.ForwardSetState(SCE_JSON_DEFAULT);
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}
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break;
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case SCE_JSON_LINECOMMENT:
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if (context.atLineEnd) {
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context.SetState(SCE_JSON_DEFAULT);
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}
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break;
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case SCE_JSON_STRINGEOL:
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if (context.atLineStart) {
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context.SetState(SCE_JSON_DEFAULT);
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}
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break;
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case SCE_JSON_ESCAPESEQUENCE:
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escapeSeq.digitsLeft--;
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if (!escapeSeq.atEscapeEnd()) {
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if (escapeSeq.isInvalidChar(context.ch)) {
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context.SetState(SCE_JSON_ERROR);
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}
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break;
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}
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if (context.ch == '"') {
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context.SetState(stringStyleBefore);
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context.ForwardSetState(SCE_C_DEFAULT);
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} else if (context.ch == '\\') {
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if (!escapeSeq.newSequence(context.chNext)) {
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context.SetState(SCE_JSON_ERROR);
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}
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context.Forward();
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} else {
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context.SetState(stringStyleBefore);
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if (context.atLineEnd) {
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context.ChangeState(SCE_JSON_STRINGEOL);
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}
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}
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break;
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case SCE_JSON_PROPERTYNAME:
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case SCE_JSON_STRING:
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if (context.ch == '"') {
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if (compactIRI.shouldHighlight()) {
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context.ChangeState(SCE_JSON_COMPACTIRI);
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context.ForwardSetState(SCE_JSON_DEFAULT);
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compactIRI.resetState();
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} else {
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context.ForwardSetState(SCE_JSON_DEFAULT);
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}
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} else if (context.atLineEnd) {
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context.ChangeState(SCE_JSON_STRINGEOL);
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} else if (context.ch == '\\') {
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stringStyleBefore = context.state;
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if (options.escapeSequence) {
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context.SetState(SCE_JSON_ESCAPESEQUENCE);
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if (!escapeSeq.newSequence(context.chNext)) {
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context.SetState(SCE_JSON_ERROR);
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}
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}
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context.Forward();
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} else if (context.Match("https://") ||
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context.Match("http://") ||
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context.Match("ssh://") ||
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context.Match("git://") ||
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context.Match("svn://") ||
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context.Match("ftp://") ||
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context.Match("mailto:")) {
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// Handle most common URI schemes only
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stringStyleBefore = context.state;
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context.SetState(SCE_JSON_URI);
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} else if (context.ch == '@') {
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// https://www.w3.org/TR/json-ld/#dfn-keyword
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if (IsNextWordInList(keywordsJSONLD, setKeywordJSONLD, context, styler)) {
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stringStyleBefore = context.state;
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context.SetState(SCE_JSON_LDKEYWORD);
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}
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} else {
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compactIRI.checkChar(context.ch);
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}
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break;
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case SCE_JSON_LDKEYWORD:
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case SCE_JSON_URI:
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if ((!setKeywordJSONLD.Contains(context.ch) &&
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(context.state == SCE_JSON_LDKEYWORD)) ||
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(!setURL.Contains(context.ch))) {
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context.SetState(stringStyleBefore);
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}
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if (context.ch == '"') {
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context.ForwardSetState(SCE_JSON_DEFAULT);
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} else if (context.atLineEnd) {
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context.ChangeState(SCE_JSON_STRINGEOL);
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}
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break;
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case SCE_JSON_OPERATOR:
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case SCE_JSON_NUMBER:
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context.SetState(SCE_JSON_DEFAULT);
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break;
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case SCE_JSON_ERROR:
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if (context.atLineEnd) {
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context.SetState(SCE_JSON_DEFAULT);
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}
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break;
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case SCE_JSON_KEYWORD:
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if (!setKeywordJSON.Contains(context.ch)) {
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context.SetState(SCE_JSON_DEFAULT);
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}
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break;
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}
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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);
|