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38 lines
1.1 KiB
38 lines
1.1 KiB
'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 = GetIntrinsic('%TypeError%'); |
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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 (Type(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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