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optimize the regexp parser

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This commit is contained in:
Erik Krogh Kristensen
2020-11-11 21:12:19 +01:00
parent de6b21986c
commit 044fbc0b49
1 changed files with 7 additions and 3 deletions
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10
javascript/extractor/src/com/semmle/js/parser/RegExpParser.java
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@@ -497,12 +497,16 @@ public class RegExpParser {
return this.finishTerm(new CharacterClass(loc, elements, inverted));
}
private static final List<String> escapeClasses = Arrays.asList("d", "D", "s", "S", "w", "W");
private RegExpTerm parseCharacterClassElement() {
SourceLocation loc = new SourceLocation(pos());
RegExpTerm atom = this.parseCharacterClassAtom();
for (String c : Arrays.asList("d", "D", "s", "S", "w", "W")) {
if (this.lookahead("-\\" + c))
return atom;
if (this.lookahead("-\\")) {
for (String c : escapeClasses) {
if (this.lookahead("-\\" + c))
return atom;
}
}
if (!this.lookahead("-]") && this.match("-") && !(atom instanceof CharacterClassEscape))
return this.finishTerm(new CharacterClassRange(loc, atom, this.parseCharacterClassAtom()));