'use strict';
var Type = require('../../type');
function resolveJavascriptRegExp(data) {
if (data === null) return false; if (data.length === 0) return false; var regexp = data, tail = /\/([gim]*)$/.exec(data), modifiers = ''; // if regexp starts with '/' it can have modifiers and must be properly closed // `/foo/gim` - modifiers tail can be maximum 3 chars if (regexp[0] === '/') { if (tail) modifiers = tail[1]; if (modifiers.length > 3) return false; // if expression starts with /, is should be properly terminated if (regexp[regexp.length - modifiers.length - 1] !== '/') return false; } return true;
}
function constructJavascriptRegExp(data) {
var regexp = data, tail = /\/([gim]*)$/.exec(data), modifiers = ''; // `/foo/gim` - tail can be maximum 4 chars if (regexp[0] === '/') { if (tail) modifiers = tail[1]; regexp = regexp.slice(1, regexp.length - modifiers.length - 1); } return new RegExp(regexp, modifiers);
}
function representJavascriptRegExp(object /*, style*/) {
var result = '/' + object.source + '/'; if (object.global) result += 'g'; if (object.multiline) result += 'm'; if (object.ignoreCase) result += 'i'; return result;
}
function isRegExp(object) {
return Object.prototype.toString.call(object) === '[object RegExp]';
}
module.exports = new Type('tag:yaml.org,2002:js/regexp', {
kind: 'scalar', resolve: resolveJavascriptRegExp, construct: constructJavascriptRegExp, predicate: isRegExp, represent: representJavascriptRegExp
});