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Dir : ~/usr/share/nodejs/json-stable-stringify/

View File Name : index.js

'use strict';

var json = typeof JSON !== 'undefined' ? JSON : require('jsonify');

var isArray = Array.isArray || function (x) {
	return {}.toString.call(x) === '[object Array]';
};

var objectKeys = Object.keys || function (obj) {
	var has = Object.prototype.hasOwnProperty || function () { return true; };
	var keys = [];
	for (var key in obj) {
		if (has.call(obj, key)) { keys.push(key); }
	}
	return keys;
};

module.exports = function (obj, opts) {
	if (!opts) { opts = {}; }
	if (typeof opts === 'function') { opts = { cmp: opts }; }
	var space = opts.space || '';
	if (typeof space === 'number') { space = Array(space + 1).join(' '); }
	var cycles = typeof opts.cycles === 'boolean' ? opts.cycles : false;
	var replacer = opts.replacer || function (key, value) { return value; };

	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(parent, key, node, level) {
		var indent = space ? '\n' + new Array(level + 1).join(space) : '';
		var colonSeparator = space ? ': ' : ':';

		if (node && node.toJSON && typeof node.toJSON === 'function') {
			node = node.toJSON();
		}

		node = replacer.call(parent, key, node);

		if (node === undefined) {
			return;
		}
		if (typeof node !== 'object' || node === null) {
			return json.stringify(node);
		}
		if (isArray(node)) {
			var out = [];
			for (var i = 0; i < node.length; i++) {
				var item = stringify(node, i, node[i], level + 1) || json.stringify(null);
				out.push(indent + space + item);
			}
			return '[' + out.join(',') + indent + ']';
		}

		if (seen.indexOf(node) !== -1) {
			if (cycles) { return json.stringify('__cycle__'); }
			throw new TypeError('Converting circular structure to JSON');
		} else { seen.push(node); }

		var keys = objectKeys(node).sort(cmp && cmp(node));
		var out = [];
		for (var i = 0; i < keys.length; i++) {
			var key = keys[i];
			var value = stringify(node, key, node[key], level + 1);

			if (!value) { continue; }

			var keyValue = json.stringify(key)
					+ colonSeparator
					+ value;

			out.push(indent + space + keyValue);
		}
		seen.splice(seen.indexOf(node), 1);
		return '{' + out.join(',') + indent + '}';

	}({ '': obj }, '', obj, 0));
};