source: trip-planner-front/node_modules/regjsparser/parser.js@ 571e0df

Last change on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

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1// regjsparser
2//
3// ==================================================================
4//
5// See ECMA-262 Standard: 15.10.1
6//
7// NOTE: The ECMA-262 standard uses the term "Assertion" for /^/. Here the
8// term "Anchor" is used.
9//
10// Pattern ::
11// Disjunction
12//
13// Disjunction ::
14// Alternative
15// Alternative | Disjunction
16//
17// Alternative ::
18// [empty]
19// Alternative Term
20//
21// Term ::
22// Anchor
23// Atom
24// Atom Quantifier
25//
26// Anchor ::
27// ^
28// $
29// \ b
30// \ B
31// ( ? = Disjunction )
32// ( ? ! Disjunction )
33// ( ? < = Disjunction )
34// ( ? < ! Disjunction )
35//
36// Quantifier ::
37// QuantifierPrefix
38// QuantifierPrefix ?
39//
40// QuantifierPrefix ::
41// *
42// +
43// ?
44// { DecimalDigits }
45// { DecimalDigits , }
46// { DecimalDigits , DecimalDigits }
47//
48// Atom ::
49// PatternCharacter
50// .
51// \ AtomEscape
52// CharacterClass
53// ( GroupSpecifier Disjunction )
54// ( ? : Disjunction )
55//
56// PatternCharacter ::
57// SourceCharacter but not any of: ^ $ \ . * + ? ( ) [ ] { } |
58//
59// AtomEscape ::
60// DecimalEscape
61// CharacterClassEscape
62// CharacterEscape
63// k GroupName
64//
65// CharacterEscape[U] ::
66// ControlEscape
67// c ControlLetter
68// HexEscapeSequence
69// RegExpUnicodeEscapeSequence[?U] (ES6)
70// IdentityEscape[?U]
71//
72// ControlEscape ::
73// one of f n r t v
74// ControlLetter ::
75// one of
76// a b c d e f g h i j k l m n o p q r s t u v w x y z
77// A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
78//
79// IdentityEscape ::
80// SourceCharacter but not c
81//
82// DecimalEscape ::
83// DecimalIntegerLiteral [lookahead ∉ DecimalDigit]
84//
85// CharacterClassEscape ::
86// one of d D s S w W
87//
88// CharacterClass ::
89// [ [lookahead ∉ {^}] ClassRanges ]
90// [ ^ ClassRanges ]
91//
92// ClassRanges ::
93// [empty]
94// [~V] NonemptyClassRanges
95// [+V] ClassContents
96//
97// NonemptyClassRanges ::
98// ClassAtom
99// ClassAtom NonemptyClassRangesNoDash
100// ClassAtom - ClassAtom ClassRanges
101//
102// NonemptyClassRangesNoDash ::
103// ClassAtom
104// ClassAtomNoDash NonemptyClassRangesNoDash
105// ClassAtomNoDash - ClassAtom ClassRanges
106//
107// ClassAtom ::
108// -
109// ClassAtomNoDash
110//
111// ClassAtomNoDash ::
112// SourceCharacter but not one of \ or ] or -
113// \ ClassEscape
114//
115// ClassEscape ::
116// DecimalEscape
117// b
118// CharacterEscape
119// CharacterClassEscape
120//
121// GroupSpecifier ::
122// [empty]
123// ? GroupName
124//
125// GroupName ::
126// < RegExpIdentifierName >
127//
128// RegExpIdentifierName ::
129// RegExpIdentifierStart
130// RegExpIdentifierName RegExpIdentifierContinue
131//
132// RegExpIdentifierStart ::
133// UnicodeIDStart
134// $
135// _
136// \ RegExpUnicodeEscapeSequence
137//
138// RegExpIdentifierContinue ::
139// UnicodeIDContinue
140// $
141// _
142// \ RegExpUnicodeEscapeSequence
143// <ZWNJ>
144// <ZWJ>
145//
146// --------------------------------------------------------------
147// NOTE: The following productions refer to the "set notation and
148// properties of strings" proposal.
149// https://github.com/tc39/proposal-regexp-set-notation
150// --------------------------------------------------------------
151//
152// ClassContents ::
153// ClassUnion
154// ClassIntersection
155// ClassSubtraction
156//
157// ClassUnion ::
158// ClassRange ClassUnion?
159// ClassOperand ClassUnion?
160//
161// ClassIntersection ::
162// ClassOperand && [lookahead ≠ &] ClassOperand
163// ClassIntersection && [lookahead ≠ &] ClassOperand
164//
165// ClassSubtraction ::
166// ClassOperand -- ClassOperand
167// ClassSubtraction -- ClassOperand
168//
169// ClassOperand ::
170// ClassCharacter
171// ClassStrings
172// NestedClass
173//
174// NestedClass ::
175// [ [lookahead ≠ ^] ClassRanges[+U,+V] ]
176// [ ^ ClassRanges[+U,+V] ]
177// \ CharacterClassEscape[+U, +V]
178//
179// ClassRange ::
180// ClassCharacter - ClassCharacter
181//
182// ClassCharacter ::
183// [lookahead ∉ ClassReservedDouble] SourceCharacter but not ClassSyntaxCharacter
184// \ CharacterEscape[+U]
185// \ ClassHalfOfDouble
186// \ b
187//
188// ClassSyntaxCharacter ::
189// one of ( ) [ ] { } / - \ |
190//
191// ClassStrings ::
192// ( ClassString MoreClassStrings? )
193//
194// MoreClassStrings ::
195// | ClassString MoreClassStrings?
196//
197// ClassString ::
198// [empty]
199// NonEmptyClassString
200//
201// NonEmptyClassString ::
202// ClassCharacter NonEmptyClassString?
203//
204// ClassReservedDouble ::
205// one of && !! ## $$ %% ** ++ ,, .. :: ;; << == >> ?? @@ ^^ __ `` ~~
206//
207// ClassHalfOfDouble ::
208// one of & - ! # % , : ; < = > @ _ ` ~
209//
210
211(function() {
212
213 var fromCodePoint = String.fromCodePoint || (function() {
214 // Implementation taken from
215 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint
216
217 var stringFromCharCode = String.fromCharCode;
218 var floor = Math.floor;
219
220 return function fromCodePoint() {
221 var MAX_SIZE = 0x4000;
222 var codeUnits = [];
223 var highSurrogate;
224 var lowSurrogate;
225 var index = -1;
226 var length = arguments.length;
227 if (!length) {
228 return '';
229 }
230 var result = '';
231 while (++index < length) {
232 var codePoint = Number(arguments[index]);
233 if (
234 !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
235 codePoint < 0 || // not a valid Unicode code point
236 codePoint > 0x10FFFF || // not a valid Unicode code point
237 floor(codePoint) != codePoint // not an integer
238 ) {
239 throw RangeError('Invalid code point: ' + codePoint);
240 }
241 if (codePoint <= 0xFFFF) { // BMP code point
242 codeUnits.push(codePoint);
243 } else { // Astral code point; split in surrogate halves
244 // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
245 codePoint -= 0x10000;
246 highSurrogate = (codePoint >> 10) + 0xD800;
247 lowSurrogate = (codePoint % 0x400) + 0xDC00;
248 codeUnits.push(highSurrogate, lowSurrogate);
249 }
250 if (index + 1 == length || codeUnits.length > MAX_SIZE) {
251 result += stringFromCharCode.apply(null, codeUnits);
252 codeUnits.length = 0;
253 }
254 }
255 return result;
256 };
257 }());
258
259 function parse(str, flags, features) {
260 if (!features) {
261 features = {};
262 }
263 function addRaw(node) {
264 node.raw = str.substring(node.range[0], node.range[1]);
265 return node;
266 }
267
268 function updateRawStart(node, start) {
269 node.range[0] = start;
270 return addRaw(node);
271 }
272
273 function createAnchor(kind, rawLength) {
274 return addRaw({
275 type: 'anchor',
276 kind: kind,
277 range: [
278 pos - rawLength,
279 pos
280 ]
281 });
282 }
283
284 function createValue(kind, codePoint, from, to) {
285 return addRaw({
286 type: 'value',
287 kind: kind,
288 codePoint: codePoint,
289 range: [from, to]
290 });
291 }
292
293 function createEscaped(kind, codePoint, value, fromOffset) {
294 fromOffset = fromOffset || 0;
295 return createValue(kind, codePoint, pos - (value.length + fromOffset), pos);
296 }
297
298 function createCharacter(matches) {
299 var _char = matches[0];
300 var first = _char.charCodeAt(0);
301 if (hasUnicodeFlag) {
302 var second;
303 if (_char.length === 1 && first >= 0xD800 && first <= 0xDBFF) {
304 second = lookahead().charCodeAt(0);
305 if (second >= 0xDC00 && second <= 0xDFFF) {
306 // Unicode surrogate pair
307 pos++;
308 return createValue(
309 'symbol',
310 (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000,
311 pos - 2, pos);
312 }
313 }
314 }
315 return createValue('symbol', first, pos - 1, pos);
316 }
317
318 function createDisjunction(alternatives, from, to) {
319 return addRaw({
320 type: 'disjunction',
321 body: alternatives,
322 range: [
323 from,
324 to
325 ]
326 });
327 }
328
329 function createDot() {
330 return addRaw({
331 type: 'dot',
332 range: [
333 pos - 1,
334 pos
335 ]
336 });
337 }
338
339 function createCharacterClassEscape(value) {
340 return addRaw({
341 type: 'characterClassEscape',
342 value: value,
343 range: [
344 pos - 2,
345 pos
346 ]
347 });
348 }
349
350 function createReference(matchIndex) {
351 return addRaw({
352 type: 'reference',
353 matchIndex: parseInt(matchIndex, 10),
354 range: [
355 pos - 1 - matchIndex.length,
356 pos
357 ]
358 });
359 }
360
361 function createNamedReference(name) {
362 return addRaw({
363 type: 'reference',
364 name: name,
365 range: [
366 name.range[0] - 3,
367 pos
368 ]
369 });
370 }
371
372 function createGroup(behavior, disjunction, from, to) {
373 return addRaw({
374 type: 'group',
375 behavior: behavior,
376 body: disjunction,
377 range: [
378 from,
379 to
380 ]
381 });
382 }
383
384 function createQuantifier(min, max, from, to) {
385 if (to == null) {
386 from = pos - 1;
387 to = pos;
388 }
389
390 return addRaw({
391 type: 'quantifier',
392 min: min,
393 max: max,
394 greedy: true,
395 body: null, // set later on
396 range: [
397 from,
398 to
399 ]
400 });
401 }
402
403 function createAlternative(terms, from, to) {
404 return addRaw({
405 type: 'alternative',
406 body: terms,
407 range: [
408 from,
409 to
410 ]
411 });
412 }
413
414 function createCharacterClass(contents, negative, from, to) {
415 return addRaw({
416 type: 'characterClass',
417 kind: contents.kind,
418 body: contents.body,
419 negative: negative,
420 range: [
421 from,
422 to
423 ]
424 });
425 }
426
427 function createClassRange(min, max, from, to) {
428 // See 15.10.2.15:
429 if (min.codePoint > max.codePoint) {
430 bail('invalid range in character class', min.raw + '-' + max.raw, from, to);
431 }
432
433 return addRaw({
434 type: 'characterClassRange',
435 min: min,
436 max: max,
437 range: [
438 from,
439 to
440 ]
441 });
442 }
443
444 function createClassStrings(strings, from, to) {
445 return addRaw({
446 type: 'classStrings',
447 strings: strings,
448 range: [from, to]
449 });
450 }
451
452 function createClassString(characters, from, to) {
453 return addRaw({
454 type: 'classString',
455 characters: characters,
456 range: [from, to]
457 });
458 }
459
460 function flattenBody(body) {
461 if (body.type === 'alternative') {
462 return body.body;
463 } else {
464 return [body];
465 }
466 }
467
468 function incr(amount) {
469 amount = (amount || 1);
470 var res = str.substring(pos, pos + amount);
471 pos += (amount || 1);
472 return res;
473 }
474
475 function skip(value) {
476 if (!match(value)) {
477 bail('character', value);
478 }
479 }
480
481 function match(value) {
482 if (str.indexOf(value, pos) === pos) {
483 return incr(value.length);
484 }
485 }
486
487 function lookahead() {
488 return str[pos];
489 }
490
491 function current(value) {
492 return str.indexOf(value, pos) === pos;
493 }
494
495 function next(value) {
496 return str[pos + 1] === value;
497 }
498
499 function matchReg(regExp) {
500 var subStr = str.substring(pos);
501 var res = subStr.match(regExp);
502 if (res) {
503 res.range = [];
504 res.range[0] = pos;
505 incr(res[0].length);
506 res.range[1] = pos;
507 }
508 return res;
509 }
510
511 function parseDisjunction() {
512 // Disjunction ::
513 // Alternative
514 // Alternative | Disjunction
515 var res = [], from = pos;
516 res.push(parseAlternative());
517
518 while (match('|')) {
519 res.push(parseAlternative());
520 }
521
522 if (res.length === 1) {
523 return res[0];
524 }
525
526 return createDisjunction(res, from, pos);
527 }
528
529 function parseAlternative() {
530 var res = [], from = pos;
531 var term;
532
533 // Alternative ::
534 // [empty]
535 // Alternative Term
536 while (term = parseTerm()) {
537 res.push(term);
538 }
539
540 if (res.length === 1) {
541 return res[0];
542 }
543
544 return createAlternative(res, from, pos);
545 }
546
547 function parseTerm() {
548 // Term ::
549 // Anchor
550 // Atom
551 // Atom Quantifier
552
553 if (pos >= str.length || current('|') || current(')')) {
554 return null; /* Means: The term is empty */
555 }
556
557 var anchor = parseAnchor();
558
559 if (anchor) {
560 return anchor;
561 }
562
563 var atom = parseAtomAndExtendedAtom();
564 if (!atom) {
565 // Check if a quantifier is following. A quantifier without an atom
566 // is an error.
567 pos_backup = pos
568 var quantifier = parseQuantifier() || false;
569 if (quantifier) {
570 pos = pos_backup
571 bail('Expected atom');
572 }
573
574 // If no unicode flag, then try to parse ExtendedAtom -> ExtendedPatternCharacter.
575 // ExtendedPatternCharacter
576 if (!hasUnicodeFlag && (res = matchReg(/^{/))) {
577 atom = createCharacter(res);
578 } else {
579 bail('Expected atom');
580 }
581 }
582 var quantifier = parseQuantifier() || false;
583 if (quantifier) {
584 quantifier.body = flattenBody(atom);
585 // The quantifier contains the atom. Therefore, the beginning of the
586 // quantifier range is given by the beginning of the atom.
587 updateRawStart(quantifier, atom.range[0]);
588 return quantifier;
589 }
590 return atom;
591 }
592
593 function parseGroup(matchA, typeA, matchB, typeB) {
594 var type = null, from = pos;
595
596 if (match(matchA)) {
597 type = typeA;
598 } else if (match(matchB)) {
599 type = typeB;
600 } else {
601 return false;
602 }
603
604 return finishGroup(type, from);
605 }
606
607 function finishGroup(type, from) {
608 var body = parseDisjunction();
609 if (!body) {
610 bail('Expected disjunction');
611 }
612 skip(')');
613 var group = createGroup(type, flattenBody(body), from, pos);
614
615 if (type == 'normal') {
616 // Keep track of the number of closed groups. This is required for
617 // parseDecimalEscape(). In case the string is parsed a second time the
618 // value already holds the total count and no incrementation is required.
619 if (firstIteration) {
620 closedCaptureCounter++;
621 }
622 }
623 return group;
624 }
625
626 function parseAnchor() {
627 // Anchor ::
628 // ^
629 // $
630 // \ b
631 // \ B
632 // ( ? = Disjunction )
633 // ( ? ! Disjunction )
634 var res, from = pos;
635
636 if (match('^')) {
637 return createAnchor('start', 1 /* rawLength */);
638 } else if (match('$')) {
639 return createAnchor('end', 1 /* rawLength */);
640 } else if (match('\\b')) {
641 return createAnchor('boundary', 2 /* rawLength */);
642 } else if (match('\\B')) {
643 return createAnchor('not-boundary', 2 /* rawLength */);
644 } else {
645 return parseGroup('(?=', 'lookahead', '(?!', 'negativeLookahead');
646 }
647 }
648
649 function parseQuantifier() {
650 // Quantifier ::
651 // QuantifierPrefix
652 // QuantifierPrefix ?
653 //
654 // QuantifierPrefix ::
655 // *
656 // +
657 // ?
658 // { DecimalDigits }
659 // { DecimalDigits , }
660 // { DecimalDigits , DecimalDigits }
661
662 var res, from = pos;
663 var quantifier;
664 var min, max;
665
666 if (match('*')) {
667 quantifier = createQuantifier(0);
668 }
669 else if (match('+')) {
670 quantifier = createQuantifier(1);
671 }
672 else if (match('?')) {
673 quantifier = createQuantifier(0, 1);
674 }
675 else if (res = matchReg(/^\{([0-9]+)\}/)) {
676 min = parseInt(res[1], 10);
677 quantifier = createQuantifier(min, min, res.range[0], res.range[1]);
678 }
679 else if (res = matchReg(/^\{([0-9]+),\}/)) {
680 min = parseInt(res[1], 10);
681 quantifier = createQuantifier(min, undefined, res.range[0], res.range[1]);
682 }
683 else if (res = matchReg(/^\{([0-9]+),([0-9]+)\}/)) {
684 min = parseInt(res[1], 10);
685 max = parseInt(res[2], 10);
686 if (min > max) {
687 bail('numbers out of order in {} quantifier', '', from, pos);
688 }
689 quantifier = createQuantifier(min, max, res.range[0], res.range[1]);
690 }
691
692 if (quantifier) {
693 if (match('?')) {
694 quantifier.greedy = false;
695 quantifier.range[1] += 1;
696 }
697 }
698
699 return quantifier;
700 }
701
702 function parseAtomAndExtendedAtom() {
703 // Parsing Atom and ExtendedAtom together due to redundancy.
704 // ExtendedAtom is defined in Apendix B of the ECMA-262 standard.
705 //
706 // SEE: https://www.ecma-international.org/ecma-262/10.0/index.html#prod-annexB-ExtendedPatternCharacter
707 //
708 // Atom ::
709 // PatternCharacter
710 // .
711 // \ AtomEscape
712 // CharacterClass
713 // ( GroupSpecifier Disjunction )
714 // ( ? : Disjunction )
715 // ExtendedAtom ::
716 // ExtendedPatternCharacter
717 // ExtendedPatternCharacter ::
718 // SourceCharacter but not one of ^$\.*+?()[|
719
720 var res;
721
722 // jviereck: allow ']', '}' here as well to be compatible with browser's
723 // implementations: ']'.match(/]/);
724 if (res = matchReg(/^[^^$\\.*+?()[\]{}|]/)) {
725 // PatternCharacter
726 return createCharacter(res);
727 }
728 else if (!hasUnicodeFlag && (res = matchReg(/^(?:]|})/))) {
729 // ExtendedPatternCharacter, first part. See parseTerm.
730 return createCharacter(res);
731 }
732 else if (match('.')) {
733 // .
734 return createDot();
735 }
736 else if (match('\\')) {
737 // \ AtomEscape
738 res = parseAtomEscape();
739 if (!res) {
740 if (!hasUnicodeFlag && lookahead() == 'c') {
741 // B.1.4 ExtendedAtom
742 // \[lookahead = c]
743 return createValue('symbol', 92, pos - 1, pos);
744 }
745 bail('atomEscape');
746 }
747 return res;
748 }
749 else if (res = parseCharacterClass()) {
750 return res;
751 }
752 else if (features.lookbehind && (res = parseGroup('(?<=', 'lookbehind', '(?<!', 'negativeLookbehind'))) {
753 return res;
754 }
755 else if (features.namedGroups && match("(?<")) {
756 var name = parseIdentifier();
757 skip(">");
758 var group = finishGroup("normal", name.range[0] - 3);
759 group.name = name;
760 return group;
761 }
762 else {
763 // ( Disjunction )
764 // ( ? : Disjunction )
765 return parseGroup('(?:', 'ignore', '(', 'normal');
766 }
767 }
768
769 function parseUnicodeSurrogatePairEscape(firstEscape) {
770 if (hasUnicodeFlag) {
771 var first, second;
772 if (firstEscape.kind == 'unicodeEscape' &&
773 (first = firstEscape.codePoint) >= 0xD800 && first <= 0xDBFF &&
774 current('\\') && next('u') ) {
775 var prevPos = pos;
776 pos++;
777 var secondEscape = parseClassEscape();
778 if (secondEscape.kind == 'unicodeEscape' &&
779 (second = secondEscape.codePoint) >= 0xDC00 && second <= 0xDFFF) {
780 // Unicode surrogate pair
781 firstEscape.range[1] = secondEscape.range[1];
782 firstEscape.codePoint = (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
783 firstEscape.type = 'value';
784 firstEscape.kind = 'unicodeCodePointEscape';
785 addRaw(firstEscape);
786 }
787 else {
788 pos = prevPos;
789 }
790 }
791 }
792 return firstEscape;
793 }
794
795 function parseClassEscape() {
796 return parseAtomEscape(true);
797 }
798
799 function parseAtomEscape(insideCharacterClass) {
800 // AtomEscape ::
801 // DecimalEscape
802 // CharacterEscape
803 // CharacterClassEscape
804 // k GroupName
805
806 var res, from = pos;
807
808 res = parseDecimalEscape() || parseNamedReference();
809 if (res) {
810 return res;
811 }
812
813 // For ClassEscape
814 if (insideCharacterClass) {
815 // b
816 if (match('b')) {
817 // 15.10.2.19
818 // The production ClassEscape :: b evaluates by returning the
819 // CharSet containing the one character <BS> (Unicode value 0008).
820 return createEscaped('singleEscape', 0x0008, '\\b');
821 } else if (match('B')) {
822 bail('\\B not possible inside of CharacterClass', '', from);
823 } else if (!hasUnicodeFlag && (res = matchReg(/^c([0-9])/))) {
824 // B.1.4
825 // c ClassControlLetter, ClassControlLetter = DecimalDigit
826 return createEscaped('controlLetter', res[1] + 16, res[1], 2);
827 } else if (!hasUnicodeFlag && (res = matchReg(/^c_/))) {
828 // B.1.4
829 // c ClassControlLetter, ClassControlLetter = _
830 return createEscaped('controlLetter', 31, '_', 2);
831 }
832 // [+U] -
833 if (hasUnicodeFlag && match('-')) {
834 return createEscaped('singleEscape', 0x002d, '\\-');
835 }
836 }
837
838 res = parseCharacterClassEscape() || parseCharacterEscape();
839
840 return res;
841 }
842
843
844 function parseDecimalEscape() {
845 // DecimalEscape ::
846 // DecimalIntegerLiteral [lookahead ∉ DecimalDigit]
847
848 var res, match;
849
850 if (res = matchReg(/^(?!0)\d+/)) {
851 match = res[0];
852 var refIdx = parseInt(res[0], 10);
853 if (refIdx <= closedCaptureCounter) {
854 // If the number is smaller than the normal-groups found so
855 // far, then it is a reference...
856 return createReference(res[0]);
857 } else {
858 // ... otherwise it needs to be interpreted as a octal (if the
859 // number is in an octal format). If it is NOT octal format,
860 // then the slash is ignored and the number is matched later
861 // as normal characters.
862
863 // Recall the negative decision to decide if the input must be parsed
864 // a second time with the total normal-groups.
865 backrefDenied.push(refIdx);
866
867 // Reset the position again, as maybe only parts of the previous
868 // matched numbers are actual octal numbers. E.g. in '019' only
869 // the '01' should be matched.
870 incr(-res[0].length);
871 if (res = matchReg(/^[0-7]{1,3}/)) {
872 return createEscaped('octal', parseInt(res[0], 8), res[0], 1);
873 } else {
874 // If we end up here, we have a case like /\91/. Then the
875 // first slash is to be ignored and the 9 & 1 to be treated
876 // like ordinary characters. Create a character for the
877 // first number only here - other number-characters
878 // (if available) will be matched later.
879 res = createCharacter(matchReg(/^[89]/));
880 return updateRawStart(res, res.range[0] - 1);
881 }
882 }
883 }
884 // Only allow octal numbers in the following. All matched numbers start
885 // with a zero (if the do not, the previous if-branch is executed).
886 // If the number is not octal format and starts with zero (e.g. `091`)
887 // then only the zeros `0` is treated here and the `91` are ordinary
888 // characters.
889 // Example:
890 // /\091/.exec('\091')[0].length === 3
891 else if (res = matchReg(/^[0-7]{1,3}/)) {
892 match = res[0];
893 if (/^0{1,3}$/.test(match)) {
894 // If they are all zeros, then only take the first one.
895 return createEscaped('null', 0x0000, '0', match.length);
896 } else {
897 return createEscaped('octal', parseInt(match, 8), match, 1);
898 }
899 }
900 return false;
901 }
902
903 function parseCharacterClassEscape() {
904 // CharacterClassEscape :: one of d D s S w W
905 var res;
906 if (res = matchReg(/^[dDsSwW]/)) {
907 return createCharacterClassEscape(res[0]);
908 } else if (features.unicodePropertyEscape && (hasUnicodeFlag || hasUnicodeSetFlag) && (res = matchReg(/^([pP])\{([^\}]+)\}/))) {
909 // https://github.com/jviereck/regjsparser/issues/77
910 return addRaw({
911 type: 'unicodePropertyEscape',
912 negative: res[1] === 'P',
913 value: res[2],
914 range: [res.range[0] - 1, res.range[1]],
915 raw: res[0]
916 });
917 }
918 return false;
919 }
920
921 function parseNamedReference() {
922 if (features.namedGroups && matchReg(/^k<(?=.*?>)/)) {
923 var name = parseIdentifier();
924 skip('>');
925 return createNamedReference(name);
926 }
927 }
928
929 function parseRegExpUnicodeEscapeSequence() {
930 var res;
931 if (res = matchReg(/^u([0-9a-fA-F]{4})/)) {
932 // UnicodeEscapeSequence
933 return parseUnicodeSurrogatePairEscape(
934 createEscaped('unicodeEscape', parseInt(res[1], 16), res[1], 2)
935 );
936 } else if (hasUnicodeFlag && (res = matchReg(/^u\{([0-9a-fA-F]+)\}/))) {
937 // RegExpUnicodeEscapeSequence (ES6 Unicode code point escape)
938 return createEscaped('unicodeCodePointEscape', parseInt(res[1], 16), res[1], 4);
939 }
940 }
941
942 function parseCharacterEscape() {
943 // CharacterEscape ::
944 // ControlEscape
945 // c ControlLetter
946 // HexEscapeSequence
947 // UnicodeEscapeSequence
948 // IdentityEscape
949
950 var res;
951 var from = pos;
952 if (res = matchReg(/^[fnrtv]/)) {
953 // ControlEscape
954 var codePoint = 0;
955 switch (res[0]) {
956 case 't': codePoint = 0x009; break;
957 case 'n': codePoint = 0x00A; break;
958 case 'v': codePoint = 0x00B; break;
959 case 'f': codePoint = 0x00C; break;
960 case 'r': codePoint = 0x00D; break;
961 }
962 return createEscaped('singleEscape', codePoint, '\\' + res[0]);
963 } else if (res = matchReg(/^c([a-zA-Z])/)) {
964 // c ControlLetter
965 return createEscaped('controlLetter', res[1].charCodeAt(0) % 32, res[1], 2);
966 } else if (res = matchReg(/^x([0-9a-fA-F]{2})/)) {
967 // HexEscapeSequence
968 return createEscaped('hexadecimalEscape', parseInt(res[1], 16), res[1], 2);
969 } else if (res = parseRegExpUnicodeEscapeSequence()) {
970 if (!res || res.codePoint > 0x10FFFF) {
971 bail('Invalid escape sequence', null, from, pos);
972 }
973 return res;
974 } else {
975 // IdentityEscape
976 return parseIdentityEscape();
977 }
978 }
979
980 function parseIdentifierAtom(check) {
981 var ch = lookahead();
982 var from = pos;
983 if (ch === '\\') {
984 incr();
985 var esc = parseRegExpUnicodeEscapeSequence();
986 if (!esc || !check(esc.codePoint)) {
987 bail('Invalid escape sequence', null, from, pos);
988 }
989 return fromCodePoint(esc.codePoint);
990 }
991 var code = ch.charCodeAt(0);
992 if (code >= 0xD800 && code <= 0xDBFF) {
993 ch += str[pos + 1];
994 var second = ch.charCodeAt(1);
995 if (second >= 0xDC00 && second <= 0xDFFF) {
996 // Unicode surrogate pair
997 code = (code - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
998 }
999 }
1000 if (!check(code)) return;
1001 incr();
1002 if (code > 0xFFFF) incr();
1003 return ch;
1004 }
1005
1006 function parseIdentifier() {
1007 // RegExpIdentifierName ::
1008 // RegExpIdentifierStart
1009 // RegExpIdentifierName RegExpIdentifierContinue
1010 //
1011 // RegExpIdentifierStart ::
1012 // UnicodeIDStart
1013 // $
1014 // _
1015 // \ RegExpUnicodeEscapeSequence
1016 //
1017 // RegExpIdentifierContinue ::
1018 // UnicodeIDContinue
1019 // $
1020 // _
1021 // \ RegExpUnicodeEscapeSequence
1022 // <ZWNJ>
1023 // <ZWJ>
1024
1025 var start = pos;
1026 var res = parseIdentifierAtom(isIdentifierStart);
1027 if (!res) {
1028 bail('Invalid identifier');
1029 }
1030
1031 var ch;
1032 while (ch = parseIdentifierAtom(isIdentifierPart)) {
1033 res += ch;
1034 }
1035
1036 return addRaw({
1037 type: 'identifier',
1038 value: res,
1039 range: [start, pos]
1040 });
1041 }
1042
1043 function isIdentifierStart(ch) {
1044 // Generated by `tools/generate-identifier-regex.js`.
1045 var NonAsciiIdentifierStart = /[\$A-Z_a-z\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\u0531-\u0556\u0559\u0560-\u0588\u05D0-\u05EA\u05EF-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u0860-\u086A\u08A0-\u08B4\u08B6-\u08BD\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u09FC\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0AF9\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C39\u0C3D\u0C58-\u0C5A\u0C60\u0C61\u0C80\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D54-\u0D56\u0D5F-\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F5\u13F8-\u13FD\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1878\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19B0-\u19C9\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1C80-\u1C88\u1C90-\u1CBA\u1CBD-\u1CBF\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2118-\u211D\u2124\u2126\u2128\u212A-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309B-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312F\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FEF\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA7B9\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA8FD\uA8FE\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB65\uAB70-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]|\uD800[\uDC00-\uDC0B\uDC0D-\uDC26\uDC28-\uDC3A\uDC3C\uDC3D\uDC3F-\uDC4D\uDC50-\uDC5D\uDC80-\uDCFA\uDD40-\uDD74\uDE80-\uDE9C\uDEA0-\uDED0\uDF00-\uDF1F\uDF2D-\uDF4A\uDF50-\uDF75\uDF80-\uDF9D\uDFA0-\uDFC3\uDFC8-\uDFCF\uDFD1-\uDFD5]|\uD801[\uDC00-\uDC9D\uDCB0-\uDCD3\uDCD8-\uDCFB\uDD00-\uDD27\uDD30-\uDD63\uDE00-\uDF36\uDF40-\uDF55\uDF60-\uDF67]|\uD802[\uDC00-\uDC05\uDC08\uDC0A-\uDC35\uDC37\uDC38\uDC3C\uDC3F-\uDC55\uDC60-\uDC76\uDC80-\uDC9E\uDCE0-\uDCF2\uDCF4\uDCF5\uDD00-\uDD15\uDD20-\uDD39\uDD80-\uDDB7\uDDBE\uDDBF\uDE00\uDE10-\uDE13\uDE15-\uDE17\uDE19-\uDE35\uDE60-\uDE7C\uDE80-\uDE9C\uDEC0-\uDEC7\uDEC9-\uDEE4\uDF00-\uDF35\uDF40-\uDF55\uDF60-\uDF72\uDF80-\uDF91]|\uD803[\uDC00-\uDC48\uDC80-\uDCB2\uDCC0-\uDCF2\uDD00-\uDD23\uDF00-\uDF1C\uDF27\uDF30-\uDF45]|\uD804[\uDC03-\uDC37\uDC83-\uDCAF\uDCD0-\uDCE8\uDD03-\uDD26\uDD44\uDD50-\uDD72\uDD76\uDD83-\uDDB2\uDDC1-\uDDC4\uDDDA\uDDDC\uDE00-\uDE11\uDE13-\uDE2B\uDE80-\uDE86\uDE88\uDE8A-\uDE8D\uDE8F-\uDE9D\uDE9F-\uDEA8\uDEB0-\uDEDE\uDF05-\uDF0C\uDF0F\uDF10\uDF13-\uDF28\uDF2A-\uDF30\uDF32\uDF33\uDF35-\uDF39\uDF3D\uDF50\uDF5D-\uDF61]|\uD805[\uDC00-\uDC34\uDC47-\uDC4A\uDC80-\uDCAF\uDCC4\uDCC5\uDCC7\uDD80-\uDDAE\uDDD8-\uDDDB\uDE00-\uDE2F\uDE44\uDE80-\uDEAA\uDF00-\uDF1A]|\uD806[\uDC00-\uDC2B\uDCA0-\uDCDF\uDCFF\uDE00\uDE0B-\uDE32\uDE3A\uDE50\uDE5C-\uDE83\uDE86-\uDE89\uDE9D\uDEC0-\uDEF8]|\uD807[\uDC00-\uDC08\uDC0A-\uDC2E\uDC40\uDC72-\uDC8F\uDD00-\uDD06\uDD08\uDD09\uDD0B-\uDD30\uDD46\uDD60-\uDD65\uDD67\uDD68\uDD6A-\uDD89\uDD98\uDEE0-\uDEF2]|\uD808[\uDC00-\uDF99]|\uD809[\uDC00-\uDC6E\uDC80-\uDD43]|[\uD80C\uD81C-\uD820\uD840-\uD868\uD86A-\uD86C\uD86F-\uD872\uD874-\uD879][\uDC00-\uDFFF]|\uD80D[\uDC00-\uDC2E]|\uD811[\uDC00-\uDE46]|\uD81A[\uDC00-\uDE38\uDE40-\uDE5E\uDED0-\uDEED\uDF00-\uDF2F\uDF40-\uDF43\uDF63-\uDF77\uDF7D-\uDF8F]|\uD81B[\uDE40-\uDE7F\uDF00-\uDF44\uDF50\uDF93-\uDF9F\uDFE0\uDFE1]|\uD821[\uDC00-\uDFF1]|\uD822[\uDC00-\uDEF2]|\uD82C[\uDC00-\uDD1E\uDD70-\uDEFB]|\uD82F[\uDC00-\uDC6A\uDC70-\uDC7C\uDC80-\uDC88\uDC90-\uDC99]|\uD835[\uDC00-\uDC54\uDC56-\uDC9C\uDC9E\uDC9F\uDCA2\uDCA5\uDCA6\uDCA9-\uDCAC\uDCAE-\uDCB9\uDCBB\uDCBD-\uDCC3\uDCC5-\uDD05\uDD07-\uDD0A\uDD0D-\uDD14\uDD16-\uDD1C\uDD1E-\uDD39\uDD3B-\uDD3E\uDD40-\uDD44\uDD46\uDD4A-\uDD50\uDD52-\uDEA5\uDEA8-\uDEC0\uDEC2-\uDEDA\uDEDC-\uDEFA\uDEFC-\uDF14\uDF16-\uDF34\uDF36-\uDF4E\uDF50-\uDF6E\uDF70-\uDF88\uDF8A-\uDFA8\uDFAA-\uDFC2\uDFC4-\uDFCB]|\uD83A[\uDC00-\uDCC4\uDD00-\uDD43]|\uD83B[\uDE00-\uDE03\uDE05-\uDE1F\uDE21\uDE22\uDE24\uDE27\uDE29-\uDE32\uDE34-\uDE37\uDE39\uDE3B\uDE42\uDE47\uDE49\uDE4B\uDE4D-\uDE4F\uDE51\uDE52\uDE54\uDE57\uDE59\uDE5B\uDE5D\uDE5F\uDE61\uDE62\uDE64\uDE67-\uDE6A\uDE6C-\uDE72\uDE74-\uDE77\uDE79-\uDE7C\uDE7E\uDE80-\uDE89\uDE8B-\uDE9B\uDEA1-\uDEA3\uDEA5-\uDEA9\uDEAB-\uDEBB]|\uD869[\uDC00-\uDED6\uDF00-\uDFFF]|\uD86D[\uDC00-\uDF34\uDF40-\uDFFF]|\uD86E[\uDC00-\uDC1D\uDC20-\uDFFF]|\uD873[\uDC00-\uDEA1\uDEB0-\uDFFF]|\uD87A[\uDC00-\uDFE0]|\uD87E[\uDC00-\uDE1D]/;
1046
1047 return (ch === 36) || (ch === 95) || // $ (dollar) and _ (underscore)
1048 (ch >= 65 && ch <= 90) || // A..Z
1049 (ch >= 97 && ch <= 122) || // a..z
1050 ((ch >= 0x80) && NonAsciiIdentifierStart.test(fromCodePoint(ch)));
1051 }
1052
1053 // Taken from the Esprima parser.
1054 function isIdentifierPart(ch) {
1055 // Generated by `tools/generate-identifier-regex.js`.
1056 var NonAsciiIdentifierPartOnly = /[0-9_\xB7\u0300-\u036F\u0387\u0483-\u0487\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u0610-\u061A\u064B-\u0669\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7\u06E8\u06EA-\u06ED\u06F0-\u06F9\u0711\u0730-\u074A\u07A6-\u07B0\u07C0-\u07C9\u07EB-\u07F3\u07FD\u0816-\u0819\u081B-\u0823\u0825-\u0827\u0829-\u082D\u0859-\u085B\u08D3-\u08E1\u08E3-\u0903\u093A-\u093C\u093E-\u094F\u0951-\u0957\u0962\u0963\u0966-\u096F\u0981-\u0983\u09BC\u09BE-\u09C4\u09C7\u09C8\u09CB-\u09CD\u09D7\u09E2\u09E3\u09E6-\u09EF\u09FE\u0A01-\u0A03\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A66-\u0A71\u0A75\u0A81-\u0A83\u0ABC\u0ABE-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AE2\u0AE3\u0AE6-\u0AEF\u0AFA-\u0AFF\u0B01-\u0B03\u0B3C\u0B3E-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B62\u0B63\u0B66-\u0B6F\u0B82\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD7\u0BE6-\u0BEF\u0C00-\u0C04\u0C3E-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C62\u0C63\u0C66-\u0C6F\u0C81-\u0C83\u0CBC\u0CBE-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CE2\u0CE3\u0CE6-\u0CEF\u0D00-\u0D03\u0D3B\u0D3C\u0D3E-\u0D44\u0D46-\u0D48\u0D4A-\u0D4D\u0D57\u0D62\u0D63\u0D66-\u0D6F\u0D82\u0D83\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DE6-\u0DEF\u0DF2\u0DF3\u0E31\u0E34-\u0E3A\u0E47-\u0E4E\u0E50-\u0E59\u0EB1\u0EB4-\u0EB9\u0EBB\u0EBC\u0EC8-\u0ECD\u0ED0-\u0ED9\u0F18\u0F19\u0F20-\u0F29\u0F35\u0F37\u0F39\u0F3E\u0F3F\u0F71-\u0F84\u0F86\u0F87\u0F8D-\u0F97\u0F99-\u0FBC\u0FC6\u102B-\u103E\u1040-\u1049\u1056-\u1059\u105E-\u1060\u1062-\u1064\u1067-\u106D\u1071-\u1074\u1082-\u108D\u108F-\u109D\u135D-\u135F\u1369-\u1371\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17B4-\u17D3\u17DD\u17E0-\u17E9\u180B-\u180D\u1810-\u1819\u18A9\u1920-\u192B\u1930-\u193B\u1946-\u194F\u19D0-\u19DA\u1A17-\u1A1B\u1A55-\u1A5E\u1A60-\u1A7C\u1A7F-\u1A89\u1A90-\u1A99\u1AB0-\u1ABD\u1B00-\u1B04\u1B34-\u1B44\u1B50-\u1B59\u1B6B-\u1B73\u1B80-\u1B82\u1BA1-\u1BAD\u1BB0-\u1BB9\u1BE6-\u1BF3\u1C24-\u1C37\u1C40-\u1C49\u1C50-\u1C59\u1CD0-\u1CD2\u1CD4-\u1CE8\u1CED\u1CF2-\u1CF4\u1CF7-\u1CF9\u1DC0-\u1DF9\u1DFB-\u1DFF\u200C\u200D\u203F\u2040\u2054\u20D0-\u20DC\u20E1\u20E5-\u20F0\u2CEF-\u2CF1\u2D7F\u2DE0-\u2DFF\u302A-\u302F\u3099\u309A\uA620-\uA629\uA66F\uA674-\uA67D\uA69E\uA69F\uA6F0\uA6F1\uA802\uA806\uA80B\uA823-\uA827\uA880\uA881\uA8B4-\uA8C5\uA8D0-\uA8D9\uA8E0-\uA8F1\uA8FF-\uA909\uA926-\uA92D\uA947-\uA953\uA980-\uA983\uA9B3-\uA9C0\uA9D0-\uA9D9\uA9E5\uA9F0-\uA9F9\uAA29-\uAA36\uAA43\uAA4C\uAA4D\uAA50-\uAA59\uAA7B-\uAA7D\uAAB0\uAAB2-\uAAB4\uAAB7\uAAB8\uAABE\uAABF\uAAC1\uAAEB-\uAAEF\uAAF5\uAAF6\uABE3-\uABEA\uABEC\uABED\uABF0-\uABF9\uFB1E\uFE00-\uFE0F\uFE20-\uFE2F\uFE33\uFE34\uFE4D-\uFE4F\uFF10-\uFF19\uFF3F]|\uD800[\uDDFD\uDEE0\uDF76-\uDF7A]|\uD801[\uDCA0-\uDCA9]|\uD802[\uDE01-\uDE03\uDE05\uDE06\uDE0C-\uDE0F\uDE38-\uDE3A\uDE3F\uDEE5\uDEE6]|\uD803[\uDD24-\uDD27\uDD30-\uDD39\uDF46-\uDF50]|\uD804[\uDC00-\uDC02\uDC38-\uDC46\uDC66-\uDC6F\uDC7F-\uDC82\uDCB0-\uDCBA\uDCF0-\uDCF9\uDD00-\uDD02\uDD27-\uDD34\uDD36-\uDD3F\uDD45\uDD46\uDD73\uDD80-\uDD82\uDDB3-\uDDC0\uDDC9-\uDDCC\uDDD0-\uDDD9\uDE2C-\uDE37\uDE3E\uDEDF-\uDEEA\uDEF0-\uDEF9\uDF00-\uDF03\uDF3B\uDF3C\uDF3E-\uDF44\uDF47\uDF48\uDF4B-\uDF4D\uDF57\uDF62\uDF63\uDF66-\uDF6C\uDF70-\uDF74]|\uD805[\uDC35-\uDC46\uDC50-\uDC59\uDC5E\uDCB0-\uDCC3\uDCD0-\uDCD9\uDDAF-\uDDB5\uDDB8-\uDDC0\uDDDC\uDDDD\uDE30-\uDE40\uDE50-\uDE59\uDEAB-\uDEB7\uDEC0-\uDEC9\uDF1D-\uDF2B\uDF30-\uDF39]|\uD806[\uDC2C-\uDC3A\uDCE0-\uDCE9\uDE01-\uDE0A\uDE33-\uDE39\uDE3B-\uDE3E\uDE47\uDE51-\uDE5B\uDE8A-\uDE99]|\uD807[\uDC2F-\uDC36\uDC38-\uDC3F\uDC50-\uDC59\uDC92-\uDCA7\uDCA9-\uDCB6\uDD31-\uDD36\uDD3A\uDD3C\uDD3D\uDD3F-\uDD45\uDD47\uDD50-\uDD59\uDD8A-\uDD8E\uDD90\uDD91\uDD93-\uDD97\uDDA0-\uDDA9\uDEF3-\uDEF6]|\uD81A[\uDE60-\uDE69\uDEF0-\uDEF4\uDF30-\uDF36\uDF50-\uDF59]|\uD81B[\uDF51-\uDF7E\uDF8F-\uDF92]|\uD82F[\uDC9D\uDC9E]|\uD834[\uDD65-\uDD69\uDD6D-\uDD72\uDD7B-\uDD82\uDD85-\uDD8B\uDDAA-\uDDAD\uDE42-\uDE44]|\uD835[\uDFCE-\uDFFF]|\uD836[\uDE00-\uDE36\uDE3B-\uDE6C\uDE75\uDE84\uDE9B-\uDE9F\uDEA1-\uDEAF]|\uD838[\uDC00-\uDC06\uDC08-\uDC18\uDC1B-\uDC21\uDC23\uDC24\uDC26-\uDC2A]|\uD83A[\uDCD0-\uDCD6\uDD44-\uDD4A\uDD50-\uDD59]|\uDB40[\uDD00-\uDDEF]/;
1057
1058 return isIdentifierStart(ch) ||
1059 (ch >= 48 && ch <= 57) || // 0..9
1060 ((ch >= 0x80) && NonAsciiIdentifierPartOnly.test(fromCodePoint(ch)));
1061 }
1062
1063 function parseIdentityEscape() {
1064 // IdentityEscape ::
1065 // [+U] SyntaxCharacter
1066 // [+U] /
1067 // [~U] SourceCharacterIdentityEscape[?N]
1068 // SourceCharacterIdentityEscape[?N] ::
1069 // [~N] SourceCharacter but not c
1070 // [+N] SourceCharacter but not one of c or k
1071
1072
1073 var tmp;
1074 var l = lookahead();
1075 if (
1076 (hasUnicodeFlag && /[\^\$\.\*\+\?\(\)\\\[\]\{\}\|\/]/.test(l)) ||
1077 (!hasUnicodeFlag && l !== "c")
1078 ) {
1079 if (l === "k" && features.lookbehind) {
1080 return null;
1081 }
1082 tmp = incr();
1083 return createEscaped('identifier', tmp.charCodeAt(0), tmp, 1);
1084 }
1085
1086 return null;
1087 }
1088
1089 function parseCharacterClass() {
1090 // CharacterClass ::
1091 // [ [lookahead ∉ {^}] ClassRanges ]
1092 // [ ^ ClassRanges ]
1093
1094 var res, from = pos;
1095 if (res = matchReg(/^\[\^/)) {
1096 res = parseClassRanges();
1097 skip(']');
1098 return createCharacterClass(res, true, from, pos);
1099 } else if (match('[')) {
1100 res = parseClassRanges();
1101 skip(']');
1102 return createCharacterClass(res, false, from, pos);
1103 }
1104
1105 return null;
1106 }
1107
1108 function parseClassRanges() {
1109 // ClassRanges ::
1110 // [empty]
1111 // [~V] NonemptyClassRanges
1112 // [+V] ClassContents
1113
1114 var res;
1115 if (current(']')) {
1116 // Empty array means nothing inside of the ClassRange.
1117 return { kind: 'union', body: [] };
1118 } else if (hasUnicodeSetFlag) {
1119 return parseClassContents();
1120 } else {
1121 res = parseNonemptyClassRanges();
1122 if (!res) {
1123 bail('nonEmptyClassRanges');
1124 }
1125 return { kind: 'union', body: res };
1126 }
1127 }
1128
1129 function parseHelperClassRanges(atom) {
1130 var from, to, res, atomTo, dash;
1131 if (current('-') && !next(']')) {
1132 // ClassAtom - ClassAtom ClassRanges
1133 from = atom.range[0];
1134 dash = createCharacter(match('-'));
1135
1136 atomTo = parseClassAtom();
1137 if (!atomTo) {
1138 bail('classAtom');
1139 }
1140 to = pos;
1141
1142 // Parse the next class range if exists.
1143 var classRanges = parseClassRanges();
1144 if (!classRanges) {
1145 bail('classRanges');
1146 }
1147
1148 // Check if both the from and atomTo have codePoints.
1149 if (!('codePoint' in atom) || !('codePoint' in atomTo)) {
1150 if (!hasUnicodeFlag) {
1151 // If not, don't create a range but treat them as
1152 // `atom` `-` `atom` instead.
1153 //
1154 // SEE: https://tc39.es/ecma262/#sec-regular-expression-patterns-semantics
1155 // NonemptyClassRanges::ClassAtom-ClassAtomClassRanges
1156 // CharacterRangeOrUnion
1157 res = [atom, dash, atomTo];
1158 } else {
1159 // With unicode flag, both sides must have codePoints if
1160 // one side has a codePoint.
1161 //
1162 // SEE: https://tc39.es/ecma262/#sec-patterns-static-semantics-early-errors
1163 // NonemptyClassRanges :: ClassAtom - ClassAtom ClassRanges
1164 bail('invalid character class');
1165 }
1166 } else {
1167 res = [createClassRange(atom, atomTo, from, to)];
1168 }
1169
1170 if (classRanges.type === 'empty') {
1171 return res;
1172 }
1173 return res.concat(classRanges.body);
1174 }
1175
1176 res = parseNonemptyClassRangesNoDash();
1177 if (!res) {
1178 bail('nonEmptyClassRangesNoDash');
1179 }
1180
1181 return [atom].concat(res);
1182 }
1183
1184 function parseNonemptyClassRanges() {
1185 // NonemptyClassRanges ::
1186 // ClassAtom
1187 // ClassAtom NonemptyClassRangesNoDash
1188 // ClassAtom - ClassAtom ClassRanges
1189
1190 var atom = parseClassAtom();
1191 if (!atom) {
1192 bail('classAtom');
1193 }
1194
1195 if (current(']')) {
1196 // ClassAtom
1197 return [atom];
1198 }
1199
1200 // ClassAtom NonemptyClassRangesNoDash
1201 // ClassAtom - ClassAtom ClassRanges
1202 return parseHelperClassRanges(atom);
1203 }
1204
1205 function parseNonemptyClassRangesNoDash() {
1206 // NonemptyClassRangesNoDash ::
1207 // ClassAtom
1208 // ClassAtomNoDash NonemptyClassRangesNoDash
1209 // ClassAtomNoDash - ClassAtom ClassRanges
1210
1211 var res = parseClassAtom();
1212 if (!res) {
1213 bail('classAtom');
1214 }
1215 if (current(']')) {
1216 // ClassAtom
1217 return res;
1218 }
1219
1220 // ClassAtomNoDash NonemptyClassRangesNoDash
1221 // ClassAtomNoDash - ClassAtom ClassRanges
1222 return parseHelperClassRanges(res);
1223 }
1224
1225 function parseClassAtom() {
1226 // ClassAtom ::
1227 // -
1228 // ClassAtomNoDash
1229 if (match('-')) {
1230 return createCharacter('-');
1231 } else {
1232 return parseClassAtomNoDash();
1233 }
1234 }
1235
1236 function parseClassAtomNoDash() {
1237 // ClassAtomNoDash ::
1238 // SourceCharacter but not one of \ or ] or -
1239 // \ ClassEscape
1240
1241 var res;
1242 if (res = matchReg(/^[^\\\]-]/)) {
1243 return createCharacter(res[0]);
1244 } else if (match('\\')) {
1245 res = parseClassEscape();
1246 if (!res) {
1247 bail('classEscape');
1248 }
1249
1250 return parseUnicodeSurrogatePairEscape(res);
1251 }
1252 }
1253
1254 function parseClassContents() {
1255 // ClassContents ::
1256 // ClassUnion
1257 // ClassIntersection
1258 // ClassSubtraction
1259 //
1260 // ClassUnion ::
1261 // ClassRange ClassUnion?
1262 // ClassOperand ClassUnion?
1263 //
1264 // ClassIntersection ::
1265 // ClassOperand && [lookahead ≠ &] ClassOperand
1266 // ClassIntersection && [lookahead ≠ &] ClassOperand
1267 //
1268 // ClassSubtraction ::
1269 // ClassOperand -- ClassOperand
1270 // ClassSubtraction -- ClassOperand
1271
1272 var body = [];
1273 var kind;
1274 var from = pos;
1275
1276 var operand = parseClassOperand(/* allowRanges*/ true);
1277 body.push(operand);
1278
1279 if (operand.type === 'classRange') {
1280 kind = 'union';
1281 } else if (current('&')) {
1282 kind = 'intersection';
1283 } else if (current('-')) {
1284 kind = 'subtraction';
1285 } else {
1286 kind = 'union';
1287 }
1288
1289 while (!current(']')) {
1290 if (kind === 'intersection') {
1291 skip('&');
1292 skip('&');
1293 if (current('&')) {
1294 bail('&& cannot be followed by &. Wrap it in parentheses: &&(&).');
1295 }
1296 } else if (kind === 'subtraction') {
1297 skip('-');
1298 skip('-');
1299 }
1300
1301 operand = parseClassOperand(/* allowRanges*/ kind === 'union');
1302 body.push(operand);
1303 }
1304
1305 return { kind: kind, body: body };
1306 }
1307
1308 function parseClassOperand(allowRanges) {
1309 // ClassOperand ::
1310 // ClassCharacter
1311 // ClassStrings
1312 // NestedClass
1313 //
1314 // NestedClass ::
1315 // [ [lookahead ≠ ^] ClassRanges[+U,+V] ]
1316 // [ ^ ClassRanges[+U,+V] ]
1317 // \ CharacterClassEscape[+U, +V]
1318 //
1319 // ClassRange ::
1320 // ClassCharacter - ClassCharacter
1321 //
1322 // ClassCharacter ::
1323 // [lookahead ∉ ClassReservedDouble] SourceCharacter but not ClassSyntaxCharacter
1324 // \ CharacterEscape[+U]
1325 // \ ClassHalfOfDouble
1326 // \ b
1327 //
1328 // ClassSyntaxCharacter ::
1329 // one of ( ) [ ] { } / - \ |
1330
1331 var from = pos;
1332 var start, res;
1333
1334 if (match('\\')) {
1335 if (res = parseCharacterClassEscape()) {
1336 start = res;
1337 } else if (res = parseClassCharacterEscapedHelper()) {
1338 // ClassOperand ::
1339 // ...
1340 // NestedClass
1341 //
1342 // NestedClass ::
1343 // ...
1344 // \ CharacterClassEscape[+U, +V]
1345 return res;
1346 } else {
1347 bail('Invalid escape', '\\' + lookahead(), from);
1348 }
1349 } else if (res = parseClassCharacterUnescapedHelper()) {
1350 start = res;
1351 } else if (res = parseClassStrings() || parseCharacterClass()) {
1352 // ClassOperand ::
1353 // ...
1354 // ClassStrings
1355 // NestedClass
1356 //
1357 // NestedClass ::
1358 // [ [lookahead ≠ ^] ClassRanges[+U,+V] ]
1359 // [ ^ ClassRanges[+U,+V] ]
1360 // ...
1361 return res;
1362 } else {
1363 bail('Invalid character', lookahead());
1364 }
1365
1366 if (allowRanges && current('-') && !next('-')) {
1367 skip('-');
1368
1369 if (res = parseClassCharacter()) {
1370 // ClassRange ::
1371 // ClassCharacter - ClassCharacter
1372 return createClassRange(start, res, from, pos);
1373 }
1374
1375 bail('Invalid range end', lookahead());
1376 }
1377
1378 // ClassOperand ::
1379 // ClassCharacter
1380 // ...
1381 return start;
1382 }
1383
1384 function parseClassCharacter() {
1385 // ClassCharacter ::
1386 // [lookahead ∉ ClassReservedDouble] SourceCharacter but not ClassSyntaxCharacter
1387 // \ CharacterEscape[+U]
1388 // \ ClassHalfOfDouble
1389 // \ b
1390
1391 if (match('\\')) {
1392 if (res = parseClassCharacterEscapedHelper()) {
1393 return res;
1394 } else {
1395 bail('Invalid escape', '\\' + lookahead(), from);
1396 }
1397 }
1398
1399 return parseClassCharacterUnescapedHelper();
1400 }
1401
1402 function parseClassCharacterUnescapedHelper() {
1403 // ClassCharacter ::
1404 // [lookahead ∉ ClassReservedDouble] SourceCharacter but not ClassSyntaxCharacter
1405 // ...
1406
1407 var res;
1408 if (res = matchReg(/^[^()[\]{}/\-\\|]/)) {
1409 return createCharacter(res);
1410 };
1411 }
1412
1413 function parseClassCharacterEscapedHelper() {
1414 // ClassCharacter ::
1415 // ...
1416 // \ CharacterEscape[+U]
1417 // \ ClassHalfOfDouble
1418 // \ b
1419
1420 if (match('b')) {
1421 return createEscaped('singleEscape', 0x0008, '\\b');
1422 } else if (match('B')) {
1423 bail('\\B not possible inside of ClassContents', '', pos - 2);
1424 } else if (res = matchReg(/^[&\-!#%,:;<=>@_`~]/)) {
1425 return createEscaped('identifier', res[0].codePointAt(0), res[0]);
1426 } else if (res = parseCharacterEscape()) {
1427 return res;
1428 } else {
1429 return null;
1430 }
1431 }
1432
1433 function parseClassStrings() {
1434 // ClassStrings ::
1435 // ( ClassString MoreClassStrings? )
1436
1437 var res = [];
1438 var from = pos;
1439
1440 if (!match('(')) {
1441 return null;
1442 }
1443
1444 do {
1445 res.push(parseClassString());
1446 } while (match('|'));
1447
1448 skip(')');
1449
1450 return createClassStrings(res, from, pos);
1451 }
1452
1453 function parseClassString() {
1454 // ClassString ::
1455 // [empty]
1456 // NonEmptyClassString
1457 //
1458 // NonEmptyClassString ::
1459 // ClassCharacter NonEmptyClassString?
1460
1461 var res = [], from = pos;
1462 var char;
1463
1464 while (char = parseClassCharacter()) {
1465 res.push(char);
1466 }
1467
1468 return createClassString(res, from, pos);
1469 }
1470
1471 function bail(message, details, from, to) {
1472 from = from == null ? pos : from;
1473 to = to == null ? from : to;
1474
1475 var contextStart = Math.max(0, from - 10);
1476 var contextEnd = Math.min(to + 10, str.length);
1477
1478 // Output a bit of context and a line pointing to where our error is.
1479 //
1480 // We are assuming that there are no actual newlines in the content as this is a regular expression.
1481 var context = ' ' + str.substring(contextStart, contextEnd);
1482 var pointer = ' ' + new Array(from - contextStart + 1).join(' ') + '^';
1483
1484 throw SyntaxError(message + ' at position ' + from + (details ? ': ' + details : '') + '\n' + context + '\n' + pointer);
1485 }
1486
1487 var backrefDenied = [];
1488 var closedCaptureCounter = 0;
1489 var firstIteration = true;
1490 var hasUnicodeFlag = (flags || "").indexOf("u") !== -1;
1491 var hasUnicodeSetFlag = (flags || "").indexOf("v") !== -1;
1492 var pos = 0;
1493
1494 if (hasUnicodeSetFlag && !features.unicodeSet) {
1495 throw new Error('The "v" flag is only supported when the .unicodeSet option is enabled.');
1496 }
1497
1498 if (hasUnicodeFlag && hasUnicodeSetFlag) {
1499 throw new Error('The "u" and "v" flags are mutually exclusive.');
1500 }
1501
1502 // Convert the input to a string and treat the empty string special.
1503 str = String(str);
1504 if (str === '') {
1505 str = '(?:)';
1506 }
1507
1508 var result = parseDisjunction();
1509
1510 if (result.range[1] !== str.length) {
1511 bail('Could not parse entire input - got stuck', '', result.range[1]);
1512 }
1513
1514 // The spec requires to interpret the `\2` in `/\2()()/` as backreference.
1515 // As the parser collects the number of capture groups as the string is
1516 // parsed it is impossible to make these decisions at the point when the
1517 // `\2` is handled. In case the local decision turns out to be wrong after
1518 // the parsing has finished, the input string is parsed a second time with
1519 // the total number of capture groups set.
1520 //
1521 // SEE: https://github.com/jviereck/regjsparser/issues/70
1522 for (var i = 0; i < backrefDenied.length; i++) {
1523 if (backrefDenied[i] <= closedCaptureCounter) {
1524 // Parse the input a second time.
1525 pos = 0;
1526 firstIteration = false;
1527 return parseDisjunction();
1528 }
1529 }
1530
1531 return result;
1532 }
1533
1534 var regjsparser = {
1535 parse: parse
1536 };
1537
1538 if (typeof module !== 'undefined' && module.exports) {
1539 module.exports = regjsparser;
1540 } else {
1541 window.regjsparser = regjsparser;
1542 }
1543
1544}());
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