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node_modules/mathjax-full/ts/output/chtml/Wrappers/TeXAtom.ts

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+/*************************************************************
+ *
+ *  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 the CHTMLTeXAtom wrapper for the MmlTeXAtom object
+ *
+ * @author dpvc@mathjax.org (Davide Cervone)
+ */
+
+import {CHTMLWrapper, CHTMLConstructor} from '../Wrapper.js';
+import {CommonTeXAtomMixin} from '../../common/Wrappers/TeXAtom.js';
+import {TeXAtom} from '../../../core/MmlTree/MmlNodes/TeXAtom.js';
+import {TEXCLASS, TEXCLASSNAMES} from '../../../core/MmlTree/MmlNode.js';
+
+/*****************************************************************/
+/**
+ * The CHTMLTeXAtom wrapper for the TeXAtom object
+ *
+ * @template N  The HTMLElement node class
+ * @template T  The Text node class
+ * @template D  The Document class
+ */
+// @ts-ignore
+export class CHTMLTeXAtom<N, T, D> extends
+CommonTeXAtomMixin<CHTMLConstructor<any, any, any>>(CHTMLWrapper) {
+
+  /**
+   * The TeXAtom wrapper
+   */
+  public static kind = TeXAtom.prototype.kind;
+
+  /**
+   * @override
+   */
+  public toCHTML(parent: N) {
+    super.toCHTML(parent);
+    this.adaptor.setAttribute(this.chtml, 'texclass', TEXCLASSNAMES[this.node.texClass]);
+    //
+    // Center VCENTER atoms vertically
+    //
+    if (this.node.texClass === TEXCLASS.VCENTER) {
+      const bbox = this.childNodes[0].getBBox();  // get unmodified bbox of children
+      const {h, d} = bbox;
+      const a = this.font.params.axis_height;
+      const dh = ((h + d) / 2 + a) - h;  // new height minus old height
+      this.adaptor.setStyle(this.chtml, 'verticalAlign', this.em(dh));
+    }
+  }
+
+}