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39 lines
900 B
39 lines
900 B
'use strict';
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class Mixin {
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constructor(host) {
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const originalMethods = {};
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const overriddenMethods = this._getOverriddenMethods(this, originalMethods);
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for (const key of Object.keys(overriddenMethods)) {
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if (typeof overriddenMethods[key] === 'function') {
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originalMethods[key] = host[key];
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host[key] = overriddenMethods[key];
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}
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}
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}
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_getOverriddenMethods() {
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throw new Error('Not implemented');
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}
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}
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Mixin.install = function(host, Ctor, opts) {
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if (!host.__mixins) {
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host.__mixins = [];
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}
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for (let i = 0; i < host.__mixins.length; i++) {
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if (host.__mixins[i].constructor === Ctor) {
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return host.__mixins[i];
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}
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}
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const mixin = new Ctor(host, opts);
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host.__mixins.push(mixin);
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return mixin;
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};
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module.exports = Mixin;
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