Created
December 30, 2013 15:47
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JSON.prune, copied from https://github.com/Canop/JSON.prune
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| (function () { | |
| 'use strict'; | |
| var DEFAULT_MAX_DEPTH = 6; | |
| var DEFAULT_ARRAY_MAX_LENGTH = 50; | |
| var seen; // Same variable used for all stringifications | |
| Date.prototype.toPrunedJSON = Date.prototype.toJSON; | |
| String.prototype.toPrunedJSON = String.prototype.toJSON; | |
| var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, | |
| escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g, | |
| meta = { // table of character substitutions | |
| '\b': '\\b', | |
| '\t': '\\t', | |
| '\n': '\\n', | |
| '\f': '\\f', | |
| '\r': '\\r', | |
| '"' : '\\"', | |
| '\\': '\\\\' | |
| }; | |
| function quote(string) { | |
| escapable.lastIndex = 0; | |
| return escapable.test(string) ? '"' + string.replace(escapable, function (a) { | |
| var c = meta[a]; | |
| return typeof c === 'string' | |
| ? c | |
| : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4); | |
| }) + '"' : '"' + string + '"'; | |
| } | |
| function str(key, holder, depthDecr, arrayMaxLength) { | |
| var i, // The loop counter. | |
| k, // The member key. | |
| v, // The member value. | |
| length, | |
| partial, | |
| value = holder[key]; | |
| if (value && typeof value === 'object' && typeof value.toPrunedJSON === 'function') { | |
| value = value.toPrunedJSON(key); | |
| } | |
| switch (typeof value) { | |
| case 'string': | |
| return quote(value); | |
| case 'number': | |
| return isFinite(value) ? String(value) : 'null'; | |
| case 'boolean': | |
| case 'null': | |
| return String(value); | |
| case 'object': | |
| if (!value) { | |
| return 'null'; | |
| } | |
| if (depthDecr<=0 || seen.indexOf(value)!==-1) { | |
| return '"-pruned-"'; | |
| } | |
| seen.push(value); | |
| partial = []; | |
| if (Object.prototype.toString.apply(value) === '[object Array]') { | |
| length = Math.min(value.length, arrayMaxLength); | |
| for (i = 0; i < length; i += 1) { | |
| partial[i] = str(i, value, depthDecr-1, arrayMaxLength) || 'null'; | |
| } | |
| v = partial.length === 0 | |
| ? '[]' | |
| : '[' + partial.join(',') + ']'; | |
| return v; | |
| } | |
| for (k in value) { | |
| if (Object.prototype.hasOwnProperty.call(value, k)) { | |
| try { | |
| v = str(k, value, depthDecr-1, arrayMaxLength); | |
| if (v) partial.push(quote(k) + ':' + v); | |
| } catch (e) { | |
| // this try/catch due to some "Accessing selectionEnd on an input element that cannot have a selection." on Chrome | |
| } | |
| } | |
| } | |
| v = partial.length === 0 | |
| ? '{}' | |
| : '{' + partial.join(',') + '}'; | |
| return v; | |
| } | |
| } | |
| JSON.pruned = function (value, depthDecr, arrayMaxLength) { | |
| seen = []; | |
| depthDecr = depthDecr || DEFAULT_MAX_DEPTH; | |
| arrayMaxLength = arrayMaxLength || DEFAULT_ARRAY_MAX_LENGTH; | |
| return str('', {'': value}, depthDecr, arrayMaxLength); | |
| }; | |
| }()); |
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