/*
|
Copyright (c) 2014, Yahoo! Inc. All rights reserved.
|
Copyrights licensed under the New BSD License.
|
See the accompanying LICENSE file for terms.
|
*/
|
|
'use strict';
|
|
var randomBytes = require('randombytes');
|
|
// Generate an internal UID to make the regexp pattern harder to guess.
|
var UID_LENGTH = 16;
|
var UID = generateUID();
|
var PLACE_HOLDER_REGEXP = new RegExp('(\\\\)?"@__(F|R|D|M|S|U|I|B)-' + UID + '-(\\d+)__@"', 'g');
|
|
var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
|
var IS_PURE_FUNCTION = /function.*?\(/;
|
var IS_ARROW_FUNCTION = /.*?=>.*?/;
|
var UNSAFE_CHARS_REGEXP = /[<>\/\u2028\u2029]/g;
|
|
var RESERVED_SYMBOLS = ['*', 'async'];
|
|
// 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];
|
}
|
|
function generateUID() {
|
var bytes = randomBytes(UID_LENGTH);
|
var result = '';
|
for(var i=0; i<UID_LENGTH; ++i) {
|
result += bytes[i].toString(16);
|
}
|
return result;
|
}
|
|
function deleteFunctions(obj){
|
var functionKeys = [];
|
for (var key in obj) {
|
if (typeof obj[key] === "function") {
|
functionKeys.push(key);
|
}
|
}
|
for (var i = 0; i < functionKeys.length; i++) {
|
delete obj[functionKeys[i]];
|
}
|
}
|
|
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 = [];
|
var maps = [];
|
var sets = [];
|
var undefs = [];
|
var infinities= [];
|
var bigInts = [];
|
|
// Returns placeholders for functions and regexps (identified by index)
|
// which are later replaced by their string representation.
|
function replacer(key, value) {
|
|
// For nested function
|
if(options.ignoreFunction){
|
deleteFunctions(value);
|
}
|
|
if (!value && value !== undefined) {
|
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(origValue instanceof Map) {
|
return '@__M-' + UID + '-' + (maps.push(origValue) - 1) + '__@';
|
}
|
|
if(origValue instanceof Set) {
|
return '@__S-' + UID + '-' + (sets.push(origValue) - 1) + '__@';
|
}
|
}
|
|
if (type === 'function') {
|
return '@__F-' + UID + '-' + (functions.push(origValue) - 1) + '__@';
|
}
|
|
if (type === 'undefined') {
|
return '@__U-' + UID + '-' + (undefs.push(origValue) - 1) + '__@';
|
}
|
|
if (type === 'number' && !isNaN(origValue) && !isFinite(origValue)) {
|
return '@__I-' + UID + '-' + (infinities.push(origValue) - 1) + '__@';
|
}
|
|
if (type === 'bigint') {
|
return '@__B-' + UID + '-' + (bigInts.push(origValue) - 1) + '__@';
|
}
|
|
return value;
|
}
|
|
function serializeFunc(fn) {
|
var serializedFn = fn.toString();
|
if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
|
throw new TypeError('Serializing native function: ' + fn.name);
|
}
|
|
// pure functions, example: {key: function() {}}
|
if(IS_PURE_FUNCTION.test(serializedFn)) {
|
return serializedFn;
|
}
|
|
// arrow functions, example: arg1 => arg1+5
|
if(IS_ARROW_FUNCTION.test(serializedFn)) {
|
return serializedFn;
|
}
|
|
var argsStartsAt = serializedFn.indexOf('(');
|
var def = serializedFn.substr(0, argsStartsAt)
|
.trim()
|
.split(' ')
|
.filter(function(val) { return val.length > 0 });
|
|
var nonReservedSymbols = def.filter(function(val) {
|
return RESERVED_SYMBOLS.indexOf(val) === -1
|
});
|
|
// enhanced literal objects, example: {key() {}}
|
if(nonReservedSymbols.length > 0) {
|
return (def.indexOf('async') > -1 ? 'async ' : '') + 'function'
|
+ (def.join('').indexOf('*') > -1 ? '*' : '')
|
+ serializedFn.substr(argsStartsAt);
|
}
|
|
// arrow functions
|
return serializedFn;
|
}
|
|
// Check if the parameter is function
|
if (options.ignoreFunction && typeof obj === "function") {
|
obj = undefined;
|
}
|
// Protects against `JSON.stringify()` returning `undefined`, by serializing
|
// to the literal string: "undefined".
|
if (obj === undefined) {
|
return String(obj);
|
}
|
|
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 && maps.length === 0 && sets.length === 0 && undefs.length === 0 && infinities.length === 0 && bigInts.length === 0) {
|
return str;
|
}
|
|
// Replaces all occurrences of function, regexp, date, map and set 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, backSlash, type, valueIndex) {
|
// The placeholder may not be preceded by a backslash. This is to prevent
|
// replacing things like `"a\"@__R-<UID>-0__@"` and thus outputting
|
// invalid JS.
|
if (backSlash) {
|
return match;
|
}
|
|
if (type === 'D') {
|
return "new Date(\"" + dates[valueIndex].toISOString() + "\")";
|
}
|
|
if (type === 'R') {
|
return "new RegExp(" + serialize(regexps[valueIndex].source) + ", \"" + regexps[valueIndex].flags + "\")";
|
}
|
|
if (type === 'M') {
|
return "new Map(" + serialize(Array.from(maps[valueIndex].entries()), options) + ")";
|
}
|
|
if (type === 'S') {
|
return "new Set(" + serialize(Array.from(sets[valueIndex].values()), options) + ")";
|
}
|
|
if (type === 'U') {
|
return 'undefined'
|
}
|
|
if (type === 'I') {
|
return infinities[valueIndex];
|
}
|
|
if (type === 'B') {
|
return "BigInt(\"" + bigInts[valueIndex] + "\")";
|
}
|
|
var fn = functions[valueIndex];
|
|
return serializeFunc(fn);
|
});
|
}
|
