source: trip-planner-front/node_modules/fast-json-stable-stringify/index.js@ bdd6491

Last change on this file since bdd6491 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.8 KB
Line 
1'use strict';
2
3module.exports = function (data, opts) {
4 if (!opts) opts = {};
5 if (typeof opts === 'function') opts = { cmp: opts };
6 var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
7
8 var cmp = opts.cmp && (function (f) {
9 return function (node) {
10 return function (a, b) {
11 var aobj = { key: a, value: node[a] };
12 var bobj = { key: b, value: node[b] };
13 return f(aobj, bobj);
14 };
15 };
16 })(opts.cmp);
17
18 var seen = [];
19 return (function stringify (node) {
20 if (node && node.toJSON && typeof node.toJSON === 'function') {
21 node = node.toJSON();
22 }
23
24 if (node === undefined) return;
25 if (typeof node == 'number') return isFinite(node) ? '' + node : 'null';
26 if (typeof node !== 'object') return JSON.stringify(node);
27
28 var i, out;
29 if (Array.isArray(node)) {
30 out = '[';
31 for (i = 0; i < node.length; i++) {
32 if (i) out += ',';
33 out += stringify(node[i]) || 'null';
34 }
35 return out + ']';
36 }
37
38 if (node === null) return 'null';
39
40 if (seen.indexOf(node) !== -1) {
41 if (cycles) return JSON.stringify('__cycle__');
42 throw new TypeError('Converting circular structure to JSON');
43 }
44
45 var seenIndex = seen.push(node) - 1;
46 var keys = Object.keys(node).sort(cmp && cmp(node));
47 out = '';
48 for (i = 0; i < keys.length; i++) {
49 var key = keys[i];
50 var value = stringify(node[key]);
51
52 if (!value) continue;
53 if (out) out += ',';
54 out += JSON.stringify(key) + ':' + value;
55 }
56 seen.splice(seenIndex, 1);
57 return '{' + out + '}';
58 })(data);
59};
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