70 lines
2.2 KiB
JavaScript
70 lines
2.2 KiB
JavaScript
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"use strict";
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global.W = {
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extend: function () {
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var lTarget = arguments[0] || {};
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var lIndex = 1;
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var lLength = arguments.length;
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var lDeep = false;
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var lOptions, lName, lSrc, lCopy, lCopyIsArray, lClone;
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// Handle a deep copy situation
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if (typeof lTarget === "boolean") {
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lDeep = lTarget;
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lTarget = arguments[1] || {};
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// skip the boolean and the target
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lIndex = 2;
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}
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// Handle case when target is a string or something (possible in deep
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// copy)
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if (typeof lTarget !== "object" && typeof lTarget != "function") {
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lTarget = {};
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}
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if (lLength === lIndex) {
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lTarget = this;
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--lIndex;
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}
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for (; lIndex < lLength; lIndex++) {
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// Only deal with non-null/undefined values
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if ((lOptions = arguments[lIndex]) != undefined) {
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// Extend the base object
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for (lName in lOptions) {
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lSrc = lTarget[lName];
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lCopy = lOptions[lName];
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// Prevent never-ending loop
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if (lTarget === lCopy) {
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continue;
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}
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// Recurse if we're merging plain objects or arrays
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if (lDeep && lCopy && (Object.isObject(lCopy) || (lCopyIsArray = Array.isArray(lCopy)))) {
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if (lCopyIsArray) {
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lCopyIsArray = false;
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lClone = lSrc && Array.isArray(lSrc) ? lSrc : [];
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} else {
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lClone = lSrc && Object.isObject(lSrc) ? lSrc : {};
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}
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// Never move original objects, clone them
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lTarget[lName] = Object.extend(lDeep, lClone, lCopy);
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// Don't bring in undefined values
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} else {
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if (lCopy !== undefined) {
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lTarget[lName] = lCopy;
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}
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}
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}
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}
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}
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// Return the modified object
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return lTarget;
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}
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};
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