source: trip-planner-front/node_modules/serialize-javascript/index.js@ 6c1585f

Last change on this file since 6c1585f was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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1/*
2Copyright (c) 2014, Yahoo! Inc. All rights reserved.
3Copyrights licensed under the New BSD License.
4See the accompanying LICENSE file for terms.
5*/
6
7'use strict';
8
9var randomBytes = require('randombytes');
10
11// Generate an internal UID to make the regexp pattern harder to guess.
12var UID_LENGTH = 16;
13var UID = generateUID();
14var PLACE_HOLDER_REGEXP = new RegExp('(\\\\)?"@__(F|R|D|M|S|A|U|I|B|L)-' + UID + '-(\\d+)__@"', 'g');
15
16var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
17var IS_PURE_FUNCTION = /function.*?\(/;
18var IS_ARROW_FUNCTION = /.*?=>.*?/;
19var UNSAFE_CHARS_REGEXP = /[<>\/\u2028\u2029]/g;
20
21var RESERVED_SYMBOLS = ['*', 'async'];
22
23// Mapping of unsafe HTML and invalid JavaScript line terminator chars to their
24// Unicode char counterparts which are safe to use in JavaScript strings.
25var ESCAPED_CHARS = {
26 '<' : '\\u003C',
27 '>' : '\\u003E',
28 '/' : '\\u002F',
29 '\u2028': '\\u2028',
30 '\u2029': '\\u2029'
31};
32
33function escapeUnsafeChars(unsafeChar) {
34 return ESCAPED_CHARS[unsafeChar];
35}
36
37function generateUID() {
38 var bytes = randomBytes(UID_LENGTH);
39 var result = '';
40 for(var i=0; i<UID_LENGTH; ++i) {
41 result += bytes[i].toString(16);
42 }
43 return result;
44}
45
46function deleteFunctions(obj){
47 var functionKeys = [];
48 for (var key in obj) {
49 if (typeof obj[key] === "function") {
50 functionKeys.push(key);
51 }
52 }
53 for (var i = 0; i < functionKeys.length; i++) {
54 delete obj[functionKeys[i]];
55 }
56}
57
58module.exports = function serialize(obj, options) {
59 options || (options = {});
60
61 // Backwards-compatibility for `space` as the second argument.
62 if (typeof options === 'number' || typeof options === 'string') {
63 options = {space: options};
64 }
65
66 var functions = [];
67 var regexps = [];
68 var dates = [];
69 var maps = [];
70 var sets = [];
71 var arrays = [];
72 var undefs = [];
73 var infinities= [];
74 var bigInts = [];
75 var urls = [];
76
77 // Returns placeholders for functions and regexps (identified by index)
78 // which are later replaced by their string representation.
79 function replacer(key, value) {
80
81 // For nested function
82 if(options.ignoreFunction){
83 deleteFunctions(value);
84 }
85
86 if (!value && value !== undefined) {
87 return value;
88 }
89
90 // If the value is an object w/ a toJSON method, toJSON is called before
91 // the replacer runs, so we use this[key] to get the non-toJSONed value.
92 var origValue = this[key];
93 var type = typeof origValue;
94
95 if (type === 'object') {
96 if(origValue instanceof RegExp) {
97 return '@__R-' + UID + '-' + (regexps.push(origValue) - 1) + '__@';
98 }
99
100 if(origValue instanceof Date) {
101 return '@__D-' + UID + '-' + (dates.push(origValue) - 1) + '__@';
102 }
103
104 if(origValue instanceof Map) {
105 return '@__M-' + UID + '-' + (maps.push(origValue) - 1) + '__@';
106 }
107
108 if(origValue instanceof Set) {
109 return '@__S-' + UID + '-' + (sets.push(origValue) - 1) + '__@';
110 }
111
112 if(origValue instanceof Array) {
113 var isSparse = origValue.filter(function(){return true}).length !== origValue.length;
114 if (isSparse) {
115 return '@__A-' + UID + '-' + (arrays.push(origValue) - 1) + '__@';
116 }
117 }
118
119 if(origValue instanceof URL) {
120 return '@__L-' + UID + '-' + (urls.push(origValue) - 1) + '__@';
121 }
122 }
123
124 if (type === 'function') {
125 return '@__F-' + UID + '-' + (functions.push(origValue) - 1) + '__@';
126 }
127
128 if (type === 'undefined') {
129 return '@__U-' + UID + '-' + (undefs.push(origValue) - 1) + '__@';
130 }
131
132 if (type === 'number' && !isNaN(origValue) && !isFinite(origValue)) {
133 return '@__I-' + UID + '-' + (infinities.push(origValue) - 1) + '__@';
134 }
135
136 if (type === 'bigint') {
137 return '@__B-' + UID + '-' + (bigInts.push(origValue) - 1) + '__@';
138 }
139
140 return value;
141 }
142
143 function serializeFunc(fn) {
144 var serializedFn = fn.toString();
145 if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
146 throw new TypeError('Serializing native function: ' + fn.name);
147 }
148
149 // pure functions, example: {key: function() {}}
150 if(IS_PURE_FUNCTION.test(serializedFn)) {
151 return serializedFn;
152 }
153
154 // arrow functions, example: arg1 => arg1+5
155 if(IS_ARROW_FUNCTION.test(serializedFn)) {
156 return serializedFn;
157 }
158
159 var argsStartsAt = serializedFn.indexOf('(');
160 var def = serializedFn.substr(0, argsStartsAt)
161 .trim()
162 .split(' ')
163 .filter(function(val) { return val.length > 0 });
164
165 var nonReservedSymbols = def.filter(function(val) {
166 return RESERVED_SYMBOLS.indexOf(val) === -1
167 });
168
169 // enhanced literal objects, example: {key() {}}
170 if(nonReservedSymbols.length > 0) {
171 return (def.indexOf('async') > -1 ? 'async ' : '') + 'function'
172 + (def.join('').indexOf('*') > -1 ? '*' : '')
173 + serializedFn.substr(argsStartsAt);
174 }
175
176 // arrow functions
177 return serializedFn;
178 }
179
180 // Check if the parameter is function
181 if (options.ignoreFunction && typeof obj === "function") {
182 obj = undefined;
183 }
184 // Protects against `JSON.stringify()` returning `undefined`, by serializing
185 // to the literal string: "undefined".
186 if (obj === undefined) {
187 return String(obj);
188 }
189
190 var str;
191
192 // Creates a JSON string representation of the value.
193 // NOTE: Node 0.12 goes into slow mode with extra JSON.stringify() args.
194 if (options.isJSON && !options.space) {
195 str = JSON.stringify(obj);
196 } else {
197 str = JSON.stringify(obj, options.isJSON ? null : replacer, options.space);
198 }
199
200 // Protects against `JSON.stringify()` returning `undefined`, by serializing
201 // to the literal string: "undefined".
202 if (typeof str !== 'string') {
203 return String(str);
204 }
205
206 // Replace unsafe HTML and invalid JavaScript line terminator chars with
207 // their safe Unicode char counterpart. This _must_ happen before the
208 // regexps and functions are serialized and added back to the string.
209 if (options.unsafe !== true) {
210 str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
211 }
212
213 if (functions.length === 0 && regexps.length === 0 && dates.length === 0 && maps.length === 0 && sets.length === 0 && arrays.length === 0 && undefs.length === 0 && infinities.length === 0 && bigInts.length === 0 && urls.length === 0) {
214 return str;
215 }
216
217 // Replaces all occurrences of function, regexp, date, map and set placeholders in the
218 // JSON string with their string representations. If the original value can
219 // not be found, then `undefined` is used.
220 return str.replace(PLACE_HOLDER_REGEXP, function (match, backSlash, type, valueIndex) {
221 // The placeholder may not be preceded by a backslash. This is to prevent
222 // replacing things like `"a\"@__R-<UID>-0__@"` and thus outputting
223 // invalid JS.
224 if (backSlash) {
225 return match;
226 }
227
228 if (type === 'D') {
229 return "new Date(\"" + dates[valueIndex].toISOString() + "\")";
230 }
231
232 if (type === 'R') {
233 return "new RegExp(" + serialize(regexps[valueIndex].source) + ", \"" + regexps[valueIndex].flags + "\")";
234 }
235
236 if (type === 'M') {
237 return "new Map(" + serialize(Array.from(maps[valueIndex].entries()), options) + ")";
238 }
239
240 if (type === 'S') {
241 return "new Set(" + serialize(Array.from(sets[valueIndex].values()), options) + ")";
242 }
243
244 if (type === 'A') {
245 return "Array.prototype.slice.call(" + serialize(Object.assign({ length: arrays[valueIndex].length }, arrays[valueIndex]), options) + ")";
246 }
247
248 if (type === 'U') {
249 return 'undefined'
250 }
251
252 if (type === 'I') {
253 return infinities[valueIndex];
254 }
255
256 if (type === 'B') {
257 return "BigInt(\"" + bigInts[valueIndex] + "\")";
258 }
259
260 if (type === 'L') {
261 return "new URL(\"" + urls[valueIndex].toString() + "\")";
262 }
263
264 var fn = functions[valueIndex];
265
266 return serializeFunc(fn);
267 });
268}
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