regexp-exec.js
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'use strict';
/* eslint-disable regexp/no-empty-capturing-group, regexp/no-empty-group, regexp/no-lazy-ends -- testing */
/* eslint-disable regexp/no-useless-quantifier -- testing */
var call = require('../internals/function-call');
var uncurryThis = require('../internals/function-uncurry-this');
var toString = require('../internals/to-string');
var regexpFlags = require('../internals/regexp-flags');
var stickyHelpers = require('../internals/regexp-sticky-helpers');
var shared = require('../internals/shared');
var create = require('../internals/object-create');
var getInternalState = require('../internals/internal-state').get;
var UNSUPPORTED_DOT_ALL = require('../internals/regexp-unsupported-dot-all');
var UNSUPPORTED_NCG = require('../internals/regexp-unsupported-ncg');
var nativeReplace = shared('native-string-replace', String.prototype.replace);
var nativeExec = RegExp.prototype.exec;
var patchedExec = nativeExec;
var charAt = uncurryThis(''.charAt);
var indexOf = uncurryThis(''.indexOf);
var replace = uncurryThis(''.replace);
var stringSlice = uncurryThis(''.slice);
var UPDATES_LAST_INDEX_WRONG = (function () {
var re1 = /a/;
var re2 = /b*/g;
call(nativeExec, re1, 'a');
call(nativeExec, re2, 'a');
return re1.lastIndex !== 0 || re2.lastIndex !== 0;
})();
var UNSUPPORTED_Y = stickyHelpers.BROKEN_CARET;
// nonparticipating capturing group, copied from es5-shim's String#split patch.
var NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;
var PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y || UNSUPPORTED_DOT_ALL || UNSUPPORTED_NCG;
if (PATCH) {
patchedExec = function exec(string) {
var re = this;
var state = getInternalState(re);
var str = toString(string);
var raw = state.raw;
var result, reCopy, lastIndex, match, i, object, group;
if (raw) {
raw.lastIndex = re.lastIndex;
result = call(patchedExec, raw, str);
re.lastIndex = raw.lastIndex;
return result;
}
var groups = state.groups;
var sticky = UNSUPPORTED_Y && re.sticky;
var flags = call(regexpFlags, re);
var source = re.source;
var charsAdded = 0;
var strCopy = str;
if (sticky) {
flags = replace(flags, 'y', '');
if (indexOf(flags, 'g') === -1) {
flags += 'g';
}
strCopy = stringSlice(str, re.lastIndex);
// Support anchored sticky behavior.
if (re.lastIndex > 0 && (!re.multiline || re.multiline && charAt(str, re.lastIndex - 1) !== '\n')) {
source = '(?: ' + source + ')';
strCopy = ' ' + strCopy;
charsAdded++;
}
// ^(? + rx + ) is needed, in combination with some str slicing, to
// simulate the 'y' flag.
reCopy = new RegExp('^(?:' + source + ')', flags);
}
if (NPCG_INCLUDED) {
reCopy = new RegExp('^' + source + '$(?!\\s)', flags);
}
if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;
match = call(nativeExec, sticky ? reCopy : re, strCopy);
if (sticky) {
if (match) {
match.input = stringSlice(match.input, charsAdded);
match[0] = stringSlice(match[0], charsAdded);
match.index = re.lastIndex;
re.lastIndex += match[0].length;
} else re.lastIndex = 0;
} else if (UPDATES_LAST_INDEX_WRONG && match) {
re.lastIndex = re.global ? match.index + match[0].length : lastIndex;
}
if (NPCG_INCLUDED && match && match.length > 1) {
// Fix browsers whose `exec` methods don't consistently return `undefined`
// for NPCG, like IE8. NOTE: This doesn't work for /(.?)?/
call(nativeReplace, match[0], reCopy, function () {
for (i = 1; i < arguments.length - 2; i++) {
if (arguments[i] === undefined) match[i] = undefined;
}
});
}
if (match && groups) {
match.groups = object = create(null);
for (i = 0; i < groups.length; i++) {
group = groups[i];
object[group[0]] = match[group[1]];
}
}
return match;
};
}
module.exports = patchedExec;