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node_modules/mathjax-full/ts/output/svg/Wrappers/math.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 SVGmath wrapper for the MmlMath object
+ *
+ * @author dpvc@mathjax.org (Davide Cervone)
+ */
+
+import {SVGWrapper, SVGConstructor} from '../Wrapper.js';
+import {CommonMathMixin} from '../../common/Wrappers/math.js';
+import {MmlMath} from '../../../core/MmlTree/MmlNodes/math.js';
+import {StyleList} from '../../../util/StyleList.js';
+import {BBox} from '../../../util/BBox.js';
+
+/*****************************************************************/
+/**
+ * The SVGmath wrapper for the MmlMath object
+ *
+ * @template N  The HTMLElement node class
+ * @template T  The Text node class
+ * @template D  The Document class
+ */
+// @ts-ignore
+export class SVGmath<N, T, D> extends
+CommonMathMixin<SVGConstructor<any, any, any>>(SVGWrapper) {
+
+  /**
+   * The math wrapper
+   */
+  public static kind = MmlMath.prototype.kind;
+
+  /**
+   * @overreide
+   */
+  public static styles: StyleList = {
+    'mjx-container[jax="SVG"][display="true"]': {
+      display: 'block',
+      'text-align': 'center',
+      margin: '1em 0'
+    },
+    'mjx-container[jax="SVG"][display="true"][width="full"]': {
+      display: 'flex'
+    },
+    'mjx-container[jax="SVG"][justify="left"]': {
+      'text-align': 'left'
+    },
+    'mjx-container[jax="SVG"][justify="right"]': {
+      'text-align': 'right'
+    }
+  };
+
+  /**
+   * @override
+   */
+  public toSVG(parent: N) {
+    super.toSVG(parent);
+    const adaptor = this.adaptor;
+    const display = (this.node.attributes.get('display') === 'block');
+    if (display) {
+      adaptor.setAttribute(this.jax.container, 'display', 'true');
+      this.handleDisplay();
+    }
+    if (this.jax.document.options.internalSpeechTitles) {
+      this.handleSpeech();
+    }
+  }
+
+  /**
+   * Set the justification, and get the minwidth and shift needed
+   * for the displayed equation.
+   */
+  protected handleDisplay() {
+    const [align, shift] = this.getAlignShift();
+    if (align !== 'center') {
+      this.adaptor.setAttribute(this.jax.container, 'justify', align);
+    }
+    if (this.bbox.pwidth === BBox.fullWidth) {
+      this.adaptor.setAttribute(this.jax.container, 'width', 'full');
+      if (this.jax.table) {
+        let {L, w, R} = this.jax.table.getOuterBBox();
+        if (align === 'right') {
+          R = Math.max(R || -shift, -shift);
+        } else if (align === 'left') {
+          L = Math.max(L || shift, shift);
+        } else if (align === 'center') {
+          w += 2 * Math.abs(shift);
+        }
+        this.jax.minwidth = Math.max(0, L + w + R);
+      }
+    } else {
+      this.jax.shift = shift;
+    }
+  }
+
+  /**
+   * Handle adding speech to the top-level node, if any.
+   */
+  protected handleSpeech() {
+    const adaptor = this.adaptor;
+    const attributes = this.node.attributes;
+    const speech = (attributes.get('aria-label') || attributes.get('data-semantic-speech')) as string;
+    if (speech) {
+      const id = this.getTitleID();
+      const label = this.svg('title', {id}, [this.text(speech)]);
+      adaptor.insert(label, adaptor.firstChild(this.element));
+      adaptor.setAttribute(this.element, 'aria-labeledby', id);
+      adaptor.removeAttribute(this.element, 'aria-label');
+      for (const child of this.childNodes[0].childNodes) {
+        adaptor.setAttribute(child.element, 'aria-hidden', 'true');
+      }
+    }
+  }
+
+  /**
+   * @return {string}  A unique ID to use for aria-labeledby title elements
+   */
+  protected getTitleID(): string {
+    return 'mjx-svg-title-' + String(this.jax.options.titleID++);
+  }
+
+  /**
+   * @override
+   */
+  public setChildPWidths(recompute: boolean, w: number = null, _clear: boolean = true) {
+    return super.setChildPWidths(recompute,
+                                 this.parent ? w : this.metrics.containerWidth / this.jax.pxPerEm,
+                                 false);
+  }
+
+}