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/*
Copyright (c) 2014, Yahoo! Inc. All rights reserved.
Copyrights licensed under the New BSD License.
See the accompanying LICENSE file for terms.
*/
'use strict';
// Generate an internal UID to make the regexp pattern harder to guess.
var UID = Math.floor(Math.random() * 0x10000000000).toString(16);
var PLACE_HOLDER_REGEXP = new RegExp('"@__(F|R|D)-' + UID + '-(\\d+)__@"', 'g');
var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
var UNSAFE_CHARS_REGEXP = /[<>\/\u2028\u2029]/g;
// Mapping of unsafe HTML and invalid JavaScript line terminator chars to their
// Unicode char counterparts which are safe to use in JavaScript strings.
var ESCAPED_CHARS = {
'<' : '\\u003C',
'>' : '\\u003E',
'/' : '\\u002F',
'\u2028': '\\u2028',
'\u2029': '\\u2029'
};
function escapeUnsafeChars(unsafeChar) {
return ESCAPED_CHARS[unsafeChar];
}
module.exports = function serialize(obj, options) {
options || (options = {});
// Backwards-compatibility for `space` as the second argument.
if (typeof options === 'number' || typeof options === 'string') {
options = {space: options};
}
var functions = [];
var regexps = [];
var dates = [];
// Returns placeholders for functions and regexps (identified by index)
// which are later replaced by their string representation.
function replacer(key, value) {
if (!value) {
return value;
}
// If the value is an object w/ a toJSON method, toJSON is called before
// the replacer runs, so we use this[key] to get the non-toJSONed value.
var origValue = this[key];
var type = typeof origValue;
if (type === 'object') {
if(origValue instanceof RegExp) {
return '@__R-' + UID + '-' + (regexps.push(origValue) - 1) + '__@';
}
if(origValue instanceof Date) {
return '@__D-' + UID + '-' + (dates.push(origValue) - 1) + '__@';
}
}
if (type === 'function') {
return '@__F-' + UID + '-' + (functions.push(origValue) - 1) + '__@';
}
return value;
}
var str;
// Creates a JSON string representation of the value.
// NOTE: Node 0.12 goes into slow mode with extra JSON.stringify() args.
if (options.isJSON && !options.space) {
str = JSON.stringify(obj);
} else {
str = JSON.stringify(obj, options.isJSON ? null : replacer, options.space);
}
// Protects against `JSON.stringify()` returning `undefined`, by serializing
// to the literal string: "undefined".
if (typeof str !== 'string') {
return String(str);
}
// Replace unsafe HTML and invalid JavaScript line terminator chars with
// their safe Unicode char counterpart. This _must_ happen before the
// regexps and functions are serialized and added back to the string.
if (options.unsafe !== true) {
str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
}
if (functions.length === 0 && regexps.length === 0 && dates.length === 0) {
return str;
}
// Replaces all occurrences of function, regexp and date placeholders in the
// JSON string with their string representations. If the original value can
// not be found, then `undefined` is used.
return str.replace(PLACE_HOLDER_REGEXP, function (match, type, valueIndex) {
if (type === 'D') {
return "new Date(\"" + dates[valueIndex].toISOString() + "\")";
}
if (type === 'R') {
return regexps[valueIndex].toString();
}
var fn = functions[valueIndex];
var serializedFn = fn.toString();
if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
throw new TypeError('Serializing native function: ' + fn.name);
}
return serializedFn;
});
}
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