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54 lines
1.0 KiB
JavaScript
54 lines
1.0 KiB
JavaScript
6 years ago
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/*!
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* preserve <https://github.com/jonschlinkert/preserve>
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*
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* Copyright (c) 2014-2015, Jon Schlinkert.
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* Licensed under the MIT license.
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*/
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'use strict';
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/**
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* Replace tokens in `str` with a temporary, heuristic placeholder.
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*
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* ```js
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* tokens.before('{a\\,b}');
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* //=> '{__ID1__}'
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* ```
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*
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* @param {String} `str`
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* @return {String} String with placeholders.
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* @api public
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*/
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exports.before = function before(str, re) {
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return str.replace(re, function (match) {
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var id = randomize();
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cache[id] = match;
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return '__ID' + id + '__';
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});
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};
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/**
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* Replace placeholders in `str` with original tokens.
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*
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* ```js
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* tokens.after('{__ID1__}');
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* //=> '{a\\,b}'
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* ```
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*
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* @param {String} `str` String with placeholders
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* @return {String} `str` String with original tokens.
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* @api public
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*/
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exports.after = function after(str) {
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return str.replace(/__ID(.{5})__/g, function (_, id) {
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return cache[id];
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});
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};
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function randomize() {
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return Math.random().toString().slice(2, 7);
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}
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var cache = {};
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