70 lines
1.2 KiB
JavaScript
70 lines
1.2 KiB
JavaScript
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'use strict';
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var regex = require('regex-not');
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var Cache = require('fragment-cache');
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/**
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* Utils
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*/
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var utils = module.exports;
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var cache = utils.cache = new Cache();
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/**
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* Cast `val` to an array
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* @return {Array}
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*/
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utils.arrayify = function(val) {
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if (!Array.isArray(val)) {
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return [val];
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}
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return val;
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};
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/**
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* Memoize a generated regex or function
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*/
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utils.memoize = function(type, pattern, options, fn) {
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var key = utils.createKey(type + pattern, options);
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if (cache.has(type, key)) {
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return cache.get(type, key);
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}
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var val = fn(pattern, options);
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if (options && options.cache === false) {
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return val;
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}
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cache.set(type, key, val);
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return val;
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};
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/**
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* Create the key to use for memoization. The key is generated
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* by iterating over the options and concatenating key-value pairs
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* to the pattern string.
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*/
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utils.createKey = function(pattern, options) {
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var key = pattern;
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if (typeof options === 'undefined') {
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return key;
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}
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for (var prop in options) {
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key += ';' + prop + '=' + String(options[prop]);
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}
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return key;
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};
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/**
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* Create the regex to use for matching text
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*/
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utils.createRegex = function(str) {
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var opts = {contains: true, strictClose: false};
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return regex(str, opts);
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};
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