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