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Diffstat (limited to 'node_modules/clone/clone.js')
-rw-r--r-- | node_modules/clone/clone.js | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/node_modules/clone/clone.js b/node_modules/clone/clone.js new file mode 100644 index 000000000..626375920 --- /dev/null +++ b/node_modules/clone/clone.js @@ -0,0 +1,160 @@ +var clone = (function() { +'use strict'; + +/** + * Clones (copies) an Object using deep copying. + * + * This function supports circular references by default, but if you are certain + * there are no circular references in your object, you can save some CPU time + * by calling clone(obj, false). + * + * Caution: if `circular` is false and `parent` contains circular references, + * your program may enter an infinite loop and crash. + * + * @param `parent` - the object to be cloned + * @param `circular` - set to true if the object to be cloned may contain + * circular references. (optional - true by default) + * @param `depth` - set to a number if the object is only to be cloned to + * a particular depth. (optional - defaults to Infinity) + * @param `prototype` - sets the prototype to be used when cloning an object. + * (optional - defaults to parent prototype). +*/ +function clone(parent, circular, depth, prototype) { + var filter; + if (typeof circular === 'object') { + depth = circular.depth; + prototype = circular.prototype; + filter = circular.filter; + circular = circular.circular + } + // maintain two arrays for circular references, where corresponding parents + // and children have the same index + var allParents = []; + var allChildren = []; + + var useBuffer = typeof Buffer != 'undefined'; + + if (typeof circular == 'undefined') + circular = true; + + if (typeof depth == 'undefined') + depth = Infinity; + + // recurse this function so we don't reset allParents and allChildren + function _clone(parent, depth) { + // cloning null always returns null + if (parent === null) + return null; + + if (depth == 0) + return parent; + + var child; + var proto; + if (typeof parent != 'object') { + return parent; + } + + if (clone.__isArray(parent)) { + child = []; + } else if (clone.__isRegExp(parent)) { + child = new RegExp(parent.source, __getRegExpFlags(parent)); + if (parent.lastIndex) child.lastIndex = parent.lastIndex; + } else if (clone.__isDate(parent)) { + child = new Date(parent.getTime()); + } else if (useBuffer && Buffer.isBuffer(parent)) { + child = new Buffer(parent.length); + parent.copy(child); + return child; + } else { + if (typeof prototype == 'undefined') { + proto = Object.getPrototypeOf(parent); + child = Object.create(proto); + } + else { + child = Object.create(prototype); + proto = prototype; + } + } + + if (circular) { + var index = allParents.indexOf(parent); + + if (index != -1) { + return allChildren[index]; + } + allParents.push(parent); + allChildren.push(child); + } + + for (var i in parent) { + var attrs; + if (proto) { + attrs = Object.getOwnPropertyDescriptor(proto, i); + } + + if (attrs && attrs.set == null) { + continue; + } + child[i] = _clone(parent[i], depth - 1); + } + + return child; + } + + return _clone(parent, depth); +} + +/** + * Simple flat clone using prototype, accepts only objects, usefull for property + * override on FLAT configuration object (no nested props). + * + * USE WITH CAUTION! This may not behave as you wish if you do not know how this + * works. + */ +clone.clonePrototype = function clonePrototype(parent) { + if (parent === null) + return null; + + var c = function () {}; + c.prototype = parent; + return new c(); +}; + +// private utility functions + +function __objToStr(o) { + return Object.prototype.toString.call(o); +}; +clone.__objToStr = __objToStr; + +function __isDate(o) { + return typeof o === 'object' && __objToStr(o) === '[object Date]'; +}; +clone.__isDate = __isDate; + +function __isArray(o) { + return typeof o === 'object' && __objToStr(o) === '[object Array]'; +}; +clone.__isArray = __isArray; + +function __isRegExp(o) { + return typeof o === 'object' && __objToStr(o) === '[object RegExp]'; +}; +clone.__isRegExp = __isRegExp; + +function __getRegExpFlags(re) { + var flags = ''; + if (re.global) flags += 'g'; + if (re.ignoreCase) flags += 'i'; + if (re.multiline) flags += 'm'; + return flags; +}; +clone.__getRegExpFlags = __getRegExpFlags; + +return clone; +})(); + +if (typeof module === 'object' && module.exports) { + module.exports = clone; +} |