v3 new release (#80)

node_modules/parse5/lib/utils/mixin.js

@@ -0,0 +1,39 @@
+'use strict';
+
+class Mixin {
+    constructor(host) {
+        const originalMethods = {};
+        const overriddenMethods = this._getOverriddenMethods(this, originalMethods);
+
+        for (const key of Object.keys(overriddenMethods)) {
+            if (typeof overriddenMethods[key] === 'function') {
+                originalMethods[key] = host[key];
+                host[key] = overriddenMethods[key];
+            }
+        }
+    }
+
+    _getOverriddenMethods() {
+        throw new Error('Not implemented');
+    }
+}
+
+Mixin.install = function(host, Ctor, opts) {
+    if (!host.__mixins) {
+        host.__mixins = [];
+    }
+
+    for (let i = 0; i < host.__mixins.length; i++) {
+        if (host.__mixins[i].constructor === Ctor) {
+            return host.__mixins[i];
+        }
+    }
+
+    const mixin = new Ctor(host, opts);
+
+    host.__mixins.push(mixin);
+
+    return mixin;
+};
+
+module.exports = Mixin;