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44 lines
976 B
44 lines
976 B
3 years ago
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/**
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* Obliterator Match Function
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* ===========================
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*
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* Function returning an iterator over the matches of the given regex on the
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* target string.
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*/
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var Iterator = require('./iterator.js');
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/**
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* Match.
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*
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* @param {RegExp} pattern - Regular expression to use.
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* @param {string} string - Target string.
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* @return {Iterator}
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*/
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module.exports = function match(pattern, string) {
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var executed = false;
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if (!(pattern instanceof RegExp))
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throw new Error(
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'obliterator/match: invalid pattern. Expecting a regular expression.'
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);
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if (typeof string !== 'string')
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throw new Error('obliterator/match: invalid target. Expecting a string.');
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return new Iterator(function () {
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if (executed && !pattern.global) {
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pattern.lastIndex = 0;
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return {done: true};
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}
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executed = true;
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var m = pattern.exec(string);
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if (m) return {value: m};
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pattern.lastIndex = 0;
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return {done: true};
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});
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};
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