forked from projectmoon/tenebrous-dicebot
73 lines
1.6 KiB
JavaScript
73 lines
1.6 KiB
JavaScript
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'use strict';
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var extend = require('extend-shallow');
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var safe = require('safe-regex');
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/**
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* The main export is a function that takes a `pattern` string and an `options` object.
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*
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* ```js
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& var not = require('regex-not');
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& console.log(not('foo'));
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& //=> /^(?:(?!^(?:foo)$).)*$/
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* ```
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*
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* @param {String} `pattern`
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* @param {Object} `options`
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* @return {RegExp} Converts the given `pattern` to a regex using the specified `options`.
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* @api public
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*/
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function toRegex(pattern, options) {
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return new RegExp(toRegex.create(pattern, options));
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}
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/**
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* Create a regex-compatible string from the given `pattern` and `options`.
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*
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* ```js
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& var not = require('regex-not');
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& console.log(not.create('foo'));
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& //=> '^(?:(?!^(?:foo)$).)*$'
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* ```
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* @param {String} `pattern`
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* @param {Object} `options`
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* @return {String}
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* @api public
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*/
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toRegex.create = function(pattern, options) {
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if (typeof pattern !== 'string') {
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throw new TypeError('expected a string');
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}
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var opts = extend({}, options);
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if (opts.contains === true) {
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opts.strictNegate = false;
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}
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var open = opts.strictOpen !== false ? '^' : '';
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var close = opts.strictClose !== false ? '$' : '';
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var endChar = opts.endChar ? opts.endChar : '+';
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var str = pattern;
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if (opts.strictNegate === false) {
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str = '(?:(?!(?:' + pattern + ')).)' + endChar;
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} else {
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str = '(?:(?!^(?:' + pattern + ')$).)' + endChar;
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}
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var res = open + str + close;
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if (opts.safe === true && safe(res) === false) {
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throw new Error('potentially unsafe regular expression: ' + res);
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}
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return res;
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};
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/**
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* Expose `toRegex`
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*/
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module.exports = toRegex;
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