83 lines
2.7 KiB
JavaScript
83 lines
2.7 KiB
JavaScript
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module.exports = function (obj, opts) {
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if (!opts) opts = {};
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if (typeof opts === 'function') opts = { cmp: opts };
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var space = opts.space || '';
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if (typeof space === 'number') space = Array(space+1).join(' ');
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var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
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var replacer = opts.replacer || function(key, value) { return value; };
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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 (parent, key, node, level) {
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var indent = space ? ('\n' + new Array(level + 1).join(space)) : '';
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var colonSeparator = space ? ': ' : ':';
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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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node = replacer.call(parent, key, node);
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if (node === undefined) {
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return;
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}
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if (typeof node !== 'object' || node === null) {
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return JSON.stringify(node);
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}
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if (isArray(node)) {
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var out = [];
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for (var i = 0; i < node.length; i++) {
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var item = stringify(node, i, node[i], level+1) || JSON.stringify(null);
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out.push(indent + space + item);
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}
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return '[' + out.join(',') + indent + ']';
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}
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else {
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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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else seen.push(node);
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var keys = objectKeys(node).sort(cmp && cmp(node));
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var out = [];
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i];
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var value = stringify(node, key, node[key], level+1);
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if(!value) continue;
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var keyValue = JSON.stringify(key)
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+ colonSeparator
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+ value;
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;
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out.push(indent + space + keyValue);
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}
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seen.splice(seen.indexOf(node), 1);
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return '{' + out.join(',') + indent + '}';
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}
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})({ '': obj }, '', obj, 0);
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};
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var isArray = Array.isArray || function (x) {
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return {}.toString.call(x) === '[object Array]';
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};
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var objectKeys = Object.keys || function (obj) {
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var has = Object.prototype.hasOwnProperty || function () { return true };
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var keys = [];
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for (var key in obj) {
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if (has.call(obj, key)) keys.push(key);
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}
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return keys;
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};
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