59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
'use strict';
|
|
|
|
module.exports = function (data, opts) {
|
|
if (!opts) opts = {};
|
|
if (typeof opts === 'function') opts = { cmp: opts };
|
|
var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
|
|
|
|
var cmp = opts.cmp && (function (f) {
|
|
return function (node) {
|
|
return function (a, b) {
|
|
var aobj = { key: a, value: node[a] };
|
|
var bobj = { key: b, value: node[b] };
|
|
return f(aobj, bobj);
|
|
};
|
|
};
|
|
})(opts.cmp);
|
|
|
|
var seen = [];
|
|
return (function stringify (node) {
|
|
if (node && node.toJSON && typeof node.toJSON === 'function') {
|
|
node = node.toJSON();
|
|
}
|
|
|
|
if (node === undefined) return;
|
|
if (typeof node == 'number') return isFinite(node) ? '' + node : 'null';
|
|
if (typeof node !== 'object') return JSON.stringify(node);
|
|
|
|
var i, out;
|
|
if (Array.isArray(node)) {
|
|
out = '[';
|
|
for (i = 0; i < node.length; i++) {
|
|
if (i) out += ',';
|
|
out += stringify(node[i]) || 'null';
|
|
}
|
|
return out + ']';
|
|
}
|
|
|
|
if (node === null) return 'null';
|
|
|
|
if (seen.indexOf(node) !== -1) {
|
|
if (cycles) return JSON.stringify('__cycle__');
|
|
throw new TypeError('Converting circular structure to JSON');
|
|
}
|
|
|
|
var seenIndex = seen.push(node) - 1;
|
|
var keys = Object.keys(node).sort(cmp && cmp(node));
|
|
out = '';
|
|
for (i = 0; i < keys.length; i++) {
|
|
var key = keys[i];
|
|
var value = stringify(node[key]);
|
|
|
|
if (!value) continue;
|
|
if (out) out += ',';
|
|
out += JSON.stringify(key) + ':' + value;
|
|
}
|
|
seen.splice(seenIndex, 1);
|
|
return '{' + out + '}';
|
|
})(data);
|
|
};
|