39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var callBound = require('call-bind/callBound');
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var $TypeError = require('es-errors/type');
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var $RegExpPrototype = GetIntrinsic('%RegExp.prototype%');
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var SameValue = require('./SameValue');
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var Type = require('./Type');
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var $indexOf = callBound('String.prototype.indexOf');
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var hasRegExpMatcher = require('is-regex');
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var getFlags = require('regexp.prototype.flags');
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// https://262.ecma-international.org/13.0/#sec-regexphasflag
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module.exports = function RegExpHasFlag(R, codeUnit) {
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if (typeof codeUnit !== 'string' || codeUnit.length !== 1) {
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throw new $TypeError('Assertion failed: `string` must be a code unit - a String of length 1');
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}
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if (Type(R) !== 'Object') {
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throw new $TypeError('Assertion failed: Type(R) is not Object');
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}
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if (!hasRegExpMatcher(R)) { // step 2
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if (SameValue(R, $RegExpPrototype)) {
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return void undefined; // step 2.a
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}
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throw new $TypeError('`R` must be a RegExp object'); // step 2.b
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}
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var flags = getFlags(R); // step 3
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return $indexOf(flags, codeUnit) > -1; // steps 4-5
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};
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