1'use strict'; 2 3var Type = require('../../type'); 4 5function resolveJavascriptRegExp(data) { 6 if (data === null) return false; 7 if (data.length === 0) return false; 8 9 var regexp = data, 10 tail = /\/([gim]*)$/.exec(data), 11 modifiers = ''; 12 13 // if regexp starts with '/' it can have modifiers and must be properly closed 14 // `/foo/gim` - modifiers tail can be maximum 3 chars 15 if (regexp[0] === '/') { 16 if (tail) modifiers = tail[1]; 17 18 if (modifiers.length > 3) return false; 19 // if expression starts with /, is should be properly terminated 20 if (regexp[regexp.length - modifiers.length - 1] !== '/') return false; 21 } 22 23 return true; 24} 25 26function constructJavascriptRegExp(data) { 27 var regexp = data, 28 tail = /\/([gim]*)$/.exec(data), 29 modifiers = ''; 30 31 // `/foo/gim` - tail can be maximum 4 chars 32 if (regexp[0] === '/') { 33 if (tail) modifiers = tail[1]; 34 regexp = regexp.slice(1, regexp.length - modifiers.length - 1); 35 } 36 37 return new RegExp(regexp, modifiers); 38} 39 40function representJavascriptRegExp(object /*, style*/) { 41 var result = '/' + object.source + '/'; 42 43 if (object.global) result += 'g'; 44 if (object.multiline) result += 'm'; 45 if (object.ignoreCase) result += 'i'; 46 47 return result; 48} 49 50function isRegExp(object) { 51 return Object.prototype.toString.call(object) === '[object RegExp]'; 52} 53 54module.exports = new Type('tag:yaml.org,2002:js/regexp', { 55 kind: 'scalar', 56 resolve: resolveJavascriptRegExp, 57 construct: constructJavascriptRegExp, 58 predicate: isRegExp, 59 represent: representJavascriptRegExp 60}); 61