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node_modules/mathjax-full/ts/output/common/Wrappers/mglyph.ts

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+/*************************************************************
+ *
+ *  Copyright (c) 2018-2022 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 CommonMglyph wrapper mixin for the MmlMglyph object
+ *
+ * @author dpvc@mathjax.org (Davide Cervone)
+ */
+
+import {AnyWrapper, WrapperConstructor, Constructor} from '../Wrapper.js';
+import {CommonTextNode} from './TextNode.js';
+import {TextNode} from '../../../core/MmlTree/MmlNode.js';
+import {BBox} from '../../../util/BBox.js';
+
+/*****************************************************************/
+/**
+ * The CommonMglyph interface
+ */
+export interface CommonMglyph extends AnyWrapper {
+  /**
+   * The image's width converted to em's
+   */
+  width: number;
+  /**
+   * The image's height converted to em's
+   */
+  height: number;
+  /*
+   * The image's valign values converted to em's
+   */
+  valign: number;
+
+  /**
+   * TextNode used for deprecated fontfamily/index use case
+   */
+  charWrapper: CommonTextNode;
+
+  /**
+   * Obtain the width, height, and valign.
+   * Note:  Currently, the width and height must be specified explicitly, or they default to 1em
+   *   Since loading the image may be asynchronous, it would require a restart.
+   *   A future extension could implement this either by subclassing this object, or
+   *   perhaps as a post-filter on the MathML input jax that adds the needed dimensions
+   */
+  getParameters(): void;
+}
+
+/**
+ * Shorthand for the CommonMglyph constructor
+ */
+export type MglyphConstructor = Constructor<CommonMglyph>;
+
+/*****************************************************************/
+/**
+ * The CommonMglyph wrapper mixin for the MmlMglyph object
+ *
+ * @template T  The Wrapper class constructor type
+ */
+export function CommonMglyphMixin<T extends WrapperConstructor>(Base: T): MglyphConstructor & T {
+
+  return class extends Base {
+
+    /**
+     * @override
+     */
+    public width: number;
+    /**
+     * @override
+     */
+    public height: number;
+    /**
+     * @override
+     */
+    public valign: number;
+
+    /**
+     * @override
+     */
+    public charWrapper: CommonTextNode;
+
+    /**
+     * @override
+     * @constructor
+     */
+    constructor(...args: any[]) {
+      super(...args);
+      this.getParameters();
+    }
+
+    /**
+     * @override
+     */
+    public getParameters() {
+      const {width, height, valign, src, index} =
+        this.node.attributes.getList('width', 'height', 'valign', 'src', 'index');
+      if (src) {
+        this.width = (width === 'auto' ? 1 : this.length2em(width));
+        this.height = (height === 'auto' ? 1 : this.length2em(height));
+        this.valign = this.length2em(valign || '0');
+      } else {
+        const text = String.fromCodePoint(parseInt(index as string));
+        const mmlFactory = this.node.factory;
+        this.charWrapper = this.wrap((mmlFactory.create('text') as TextNode).setText(text));
+        this.charWrapper.parent = this as any as AnyWrapper;
+      }
+    }
+
+    /**
+     * @override
+     */
+    public computeBBox(bbox: BBox, _recompute: boolean = false) {
+      if (this.charWrapper) {
+        bbox.updateFrom(this.charWrapper.getBBox());
+      } else {
+        bbox.w = this.width;
+        bbox.h = this.height + this.valign;
+        bbox.d = -this.valign;
+      }
+    }
+
+  };
+
+}