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var json = typeof JSON !== 'undefined' ? JSON : require('jsonify');
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 + ']';
}
else {
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);
};
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;
};
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