add initial marp implementation with sample content and build configuration

node_modules/mathjax-full/ts/output/svg/FontCache.ts

@@ -0,0 +1,107 @@
+/*************************************************************
+ *
+ *  Copyright (c) 2019-2022 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 the FontCache object for SVG output
+ *
+ * @author dpvc@mathjax.org (Davide Cervone)
+ */
+
+import {SVG} from '../svg.js';
+
+export class FontCache<N, T, D> {
+
+  /**
+   * The SVG jax that owsn this cache
+   */
+  protected jax: SVG<N, T, D>;
+
+  /**
+   * The cache of font character IDs to their paths
+   */
+  protected cache: Map<string, string> = new Map();
+
+  /**
+   * The SVG <defs> element for storing the cache
+   */
+  protected defs: N = null;
+
+  /**
+   * A string to use to make per-equation cache IDs unique
+   */
+  protected localID: string = '';
+
+  /**
+   * A number used to make localID values to use for each equation
+   */
+  protected nextID: number = 0;
+
+  /**
+   * @param {SVG} jax  The SVG jax owning this font cache
+   */
+  constructor(jax: SVG<N, T, D>) {
+    this.jax = jax;
+  }
+
+  /**
+   * Cache a character from a particular variant and return the cache ID
+   *
+   * @param {string} variant   The variant name for the character
+   * @param {string} C         The character to be cached
+   * @param {string} path      The SVG path data for the character
+   * @return {string}          The id for the cached <path> element
+   */
+  public cachePath(variant: string, C: string, path: string): string {
+    const id = 'MJX-' + this.localID + (this.jax.font.getVariant(variant).cacheID || '') + '-' + C;
+    if (!this.cache.has(id)) {
+      this.cache.set(id, path);
+      this.jax.adaptor.append(this.defs, this.jax.svg('path', {id: id, d: path}));
+    }
+    return id;
+  }
+
+  /**
+   * Clear the localID value
+   */
+  public clearLocalID() {
+    this.localID = '';
+  }
+
+  /**
+   * Use a localID (for font-specific caching), either with a specific string,
+   * or from the nextID number.
+   */
+  public useLocalID(id: string = null) {
+    this.localID = (id == null ? ++this.nextID : id) + (id === '' ? '' : '-');
+  }
+
+  /**
+   * Clear the cache
+   */
+  public clearCache() {
+    this.cache = new Map();
+    this.defs = this.jax.svg('defs');
+  }
+
+  /**
+   * Return the font cache <defs> element
+   */
+  public getCache() {
+    return this.defs;
+  }
+
+}