34 lines
885 B
JavaScript
34 lines
885 B
JavaScript
'use strict';
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var $TypeError = require('es-errors/type');
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var AllCharacters = require('./AllCharacters');
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var CharSet = require('../helpers/CharSet').CharSet;
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var isRegExpRecord = require('../helpers/records/regexp-record');
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// https://262.ecma-international.org/15.0/#sec-charactercomplement
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module.exports = function CharacterComplement(rer, S) {
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if (!isRegExpRecord(rer)) {
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throw new $TypeError('Assertion failed: `rer` must be a RegExp Record');
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}
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if (!(S instanceof CharSet)) {
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throw new $TypeError('Assertion failed: S must be a CharSet');
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}
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var A = AllCharacters(rer); // step 1
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// 2. Return the CharSet containing the CharSetElements of A which are not also CharSetElements of S.
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return new CharSet(
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function (x) { return !S.test(x) && A.test(x); },
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function (emit) {
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A.yield(function (x) {
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if (!S.test(x)) {
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emit(x);
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}
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});
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}
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);
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};
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