110 lines
3.0 KiB
JavaScript
110 lines
3.0 KiB
JavaScript
var util = require('util');
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/**
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*
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* @param newClass
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* @param baseClass
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*/
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exports.inherits = function (newClass, baseClass, options) {
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util.inherits(newClass, baseClass);
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options = options || {
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staticProperties: true,
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override: false
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};
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if (options.staticProperties) {
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Object.keys(baseClass).forEach(function (classProp) {
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if (classProp !== 'super_' && (!newClass.hasOwnProperty(classProp)
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|| options.override)) {
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var pd = Object.getOwnPropertyDescriptor(baseClass, classProp);
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Object.defineProperty(newClass, classProp, pd);
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}
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});
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}
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};
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/**
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* Mix in the a class into the new class
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* @param newClass The target class to receive the mixin
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* @param mixinClass The class to be mixed in
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* @param options
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*/
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exports.mixin = function (newClass, mixinClass, options) {
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if (Array.isArray(newClass._mixins)) {
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if (newClass._mixins.indexOf(mixinClass) !== -1) {
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return;
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}
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newClass._mixins.push(mixinClass);
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} else {
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newClass._mixins = [mixinClass];
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}
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options = options || {
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staticProperties: true,
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instanceProperties: true,
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override: false,
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proxyFunctions: false
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};
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if (options.staticProperties === undefined) {
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options.staticProperties = true;
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}
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if (options.instanceProperties === undefined) {
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options.instanceProperties = true;
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}
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if (options.staticProperties) {
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mixInto(mixinClass, newClass, options);
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}
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if (options.instanceProperties && mixinClass.prototype) {
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mixInto(mixinClass.prototype, newClass.prototype, options);
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}
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return newClass;
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};
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function mixInto(sourceScope, targetScope, options) {
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var proxies = [];
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Object.keys(sourceScope).forEach(function (propertyName, options) {
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var targetPropertyExists = targetScope.hasOwnProperty(propertyName);
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var sourceProperty = Object.getOwnPropertyDescriptor(sourceScope, propertyName);
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var targetProperty = targetPropertyExists && Object.getOwnPropertyDescriptor(targetScope, propertyName);
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var sourceIsFunc = typeof sourceProperty.value === 'function';
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var isFunc = targetPropertyExists && typeof targetProperty.value === 'function';
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var isDelegate = isFunc && targetProperty.value._delegate;
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var shouldOverride = options.override || !targetPropertyExists || isDelegate;
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if (shouldOverride) {
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if (sourceIsFunc) {
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sourceProperty.value = exports.proxy(sourceProperty.value, proxies);
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}
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Object.defineProperty(targetScope, propertyName, sourceProperty);
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}
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});
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}
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exports.proxy = function createProxy(fn, proxies) {
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// Make sure same methods referenced by different properties have the same proxy
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// For example, deleteById is an alias of removeById
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proxies = proxies || [];
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for (var i = 0; i < proxies.length; i++) {
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if (proxies[i]._delegate === fn) {
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return proxies[i];
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}
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}
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var f = function () {
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return fn.apply(this, arguments);
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};
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f._delegate = fn;
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proxies.push(f);
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Object.keys(fn).forEach(function (x) {
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f[x] = fn[x];
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});
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return f;
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};
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