add initial marp implementation with sample content and build configuration

node_modules/mathjax-full/ts/a11y/explorer/TreeExplorer.ts

@@ -0,0 +1,124 @@
+/*************************************************************
+ *
+ *  Copyright (c) 2009-2022 The MathJax Consortium
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+
+/**
+ * @fileoverview Tree Explorers allow to switch on effects on the entire
+ *     expression tree.
+ *
+ * @author v.sorge@mathjax.org (Volker Sorge)
+ */
+
+
+import {A11yDocument, Region} from './Region.js';
+import {Explorer, AbstractExplorer} from './Explorer.js';
+import Sre from '../sre.js';
+
+export interface TreeExplorer extends Explorer {
+
+}
+
+
+export class AbstractTreeExplorer extends AbstractExplorer<void> {
+
+  /**
+   * @override
+   */
+  protected constructor(public document: A11yDocument,
+                        protected region: Region<void>,
+                        protected node: HTMLElement,
+                        protected mml: HTMLElement) {
+    super(document, null, node);
+  }
+
+  /**
+   * @override
+   */
+  public readonly stoppable = false;
+
+
+  /**
+   * @override
+   */
+  public Attach() {
+    super.Attach();
+    this.Start();
+  }
+
+  /**
+   * @override
+   */
+  public Detach() {
+    this.Stop();
+    super.Detach();
+  }
+
+}
+
+
+export class FlameColorer extends AbstractTreeExplorer {
+
+  /**
+   * @override
+   */
+  public Start() {
+    if (this.active) return;
+    this.active = true;
+    this.highlighter.highlightAll(this.node);
+  }
+
+  /**
+   * @override
+   */
+  public Stop() {
+    if (this.active) {
+      this.highlighter.unhighlightAll();
+    }
+    this.active = false;
+  }
+
+}
+
+
+export class TreeColorer extends AbstractTreeExplorer {
+
+  /**
+   * @override
+   */
+  public Start() {
+    if (this.active) return;
+    this.active = true;
+    let generator = Sre.getSpeechGenerator('Color');
+    if (!this.node.hasAttribute('hasforegroundcolor')) {
+      generator.generateSpeech(this.node, this.mml);
+      this.node.setAttribute('hasforegroundcolor', 'true');
+    }
+    // TODO: Make this cleaner in Sre.
+    (this.highlighter as any).colorizeAll(this.node);
+  }
+
+  /**
+   * @override
+   */
+  public Stop() {
+    if (this.active) {
+      (this.highlighter as any).uncolorizeAll(this.node);
+    }
+    this.active = false;
+  }
+
+}