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/** | |
* Cycle detection function | |
* Outputs count and grouped cycles with a from key path and to key path. | |
* The executing browser should have console.group and .groupEnd functions. | |
* | |
* Based on: | |
* http://stackoverflow.com/questions/14962018/detecting-and-fixing-circular-references-in-javascript/14962496#14962496 | |
* | |
* @param {Object} obj Any js object | |
* @return {void} | |
*/ | |
function detect(obj) { | |
var i = 0, nodes = [], cycles = [], cycle; | |
function search(val) { | |
var i = 0, node; | |
for (; i < nodes.length; i++) { | |
node = nodes[i]; | |
if (node.obj === val) { | |
return node; | |
} | |
} | |
return false; | |
} | |
function conj(arr, key) { | |
var narr = [].concat(arr); | |
narr.push(key); | |
return narr; | |
} | |
function walk(obj, keys) { | |
var key, res; | |
if (typeof obj !== 'object') { return; } | |
res = search(obj); | |
if (res) { | |
cycles.push({ | |
from: keys, | |
to: res.keys, | |
obj: obj | |
}); | |
} else { | |
nodes.push({obj:obj, keys:keys}); | |
for (key in obj) { | |
if (obj.hasOwnProperty(key)) { | |
walk(obj[key], conj(keys, key)); | |
} | |
} | |
} | |
} | |
walk(obj, []); | |
console.log("\nobj has " + cycles.length + " cycle(s)"); | |
for(; i < cycles.length; i++) { | |
cycle = cycles[i]; | |
console.group("idx: " + i); | |
console.log(JSON.stringify(cycle.from) + ' to ' + JSON.stringify(cycle.to)); | |
/*console.log(cycle.obj);*/ | |
console.groupEnd(); | |
} | |
} |
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