add initial marp implementation with sample content and build configuration

node_modules/mathjax-full/ts/util/PrioritizedList.ts

@@ -0,0 +1,116 @@
+/*************************************************************
+ *
+ *  Copyright (c) 2017-2022 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  Implements a list sorted by a numeric priority
+ *
+ * @author dpvc@mathjax.org (Davide Cervone)
+ */
+
+/*****************************************************************/
+/**
+ *  The PrioritizedListItem<DataClass> interface
+ *
+ * @template DataClass   The class of data stored in the item
+ */
+
+export interface PrioritizedListItem<DataClass> {
+
+  /**
+   * The priority of this item
+   */
+  priority: number;
+
+  /**
+   * The data for the list item
+   */
+  item: DataClass;
+}
+
+/*****************************************************************/
+/**
+ *  Implements the PrioritizedList<DataClass> class
+ *
+ * @template DataClass   The class of data stored in the list
+ */
+
+export class PrioritizedList<DataClass> {
+
+  /**
+   * The default priority for items added to the list
+   */
+  public static DEFAULTPRIORITY: number = 5;
+
+  /**
+   * The list of items, sorted by priority (smallest number first)
+   */
+  protected items: PrioritizedListItem<DataClass>[] = [];
+
+  /**
+   * @constructor
+   */
+  constructor() {
+    this.items = [];
+  }
+
+  /**
+   * Make the list iterable, and return the data for the items in the list
+   *
+   * @return {{next: Function}}  The object containing the iterator's next() function
+   */
+  public [Symbol.iterator](): Iterator<PrioritizedListItem<DataClass>> {
+    let i = 0;
+    let items = this.items;
+    return {
+      /* tslint:disable-next-line:jsdoc-require */
+      next(): IteratorResult<PrioritizedListItem<DataClass>> {
+        return {value: items[i++], done: (i > items.length)};
+      }
+    };
+  }
+
+  /**
+   * Add an item to the list
+   *
+   * @param {DataClass} item   The data for the item to be added
+   * @param {number} priority  The priority for the item
+   * @return {DataClass}       The data itself
+   */
+  public add(item: DataClass, priority: number = PrioritizedList.DEFAULTPRIORITY): DataClass {
+    let i = this.items.length;
+    do {
+      i--;
+    } while (i >= 0 && priority < this.items[i].priority);
+    this.items.splice(i + 1, 0, {item: item, priority: priority});
+    return item;
+  }
+
+  /**
+   * Remove an item from the list
+   *
+   * @param {DataClass} item   The data for the item to be removed
+   */
+  public remove(item: DataClass) {
+    let i = this.items.length;
+    do {
+      i--;
+    } while (i >= 0 && this.items[i].item !== item);
+    if (i >= 0) {
+      this.items.splice(i, 1);
+    }
+  }
+}