69 lines
1.3 KiB
JavaScript
69 lines
1.3 KiB
JavaScript
/*!
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* regex-cache <https://github.com/jonschlinkert/regex-cache>
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*
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* Copyright (c) 2015-2017, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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var equal = require('is-equal-shallow');
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var basic = {};
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var cache = {};
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/**
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* Expose `regexCache`
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*/
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module.exports = regexCache;
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/**
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* Memoize the results of a call to the new RegExp constructor.
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*
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* @param {Function} fn [description]
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* @param {String} str [description]
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* @param {Options} options [description]
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* @param {Boolean} nocompare [description]
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* @return {RegExp}
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*/
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function regexCache(fn, str, opts) {
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var key = '_default_', regex, cached;
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if (!str && !opts) {
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if (typeof fn !== 'function') {
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return fn;
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}
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return basic[key] || (basic[key] = fn(str));
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}
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var isString = typeof str === 'string';
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if (isString) {
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if (!opts) {
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return basic[str] || (basic[str] = fn(str));
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}
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key = str;
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} else {
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opts = str;
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}
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cached = cache[key];
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if (cached && equal(cached.opts, opts)) {
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return cached.regex;
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}
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memo(key, opts, (regex = fn(str, opts)));
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return regex;
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}
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function memo(key, opts, regex) {
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cache[key] = {regex: regex, opts: opts};
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}
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/**
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* Expose `cache`
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*/
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module.exports.cache = cache;
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module.exports.basic = basic;
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