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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 HTMLMathItem class
- *
- * @author dpvc@mathjax.org (Davide Cervone)
- */
- import {AbstractMathItem, Location, STATE} from '../../core/MathItem.js';
- import {InputJax} from '../../core/InputJax.js';
- import {HTMLDocument} from './HTMLDocument.js';
- /*****************************************************************/
- /**
- * Implements the HTMLMathItem class (extends AbstractMathItem)
- *
- * @template N The HTMLElement node class
- * @template T The Text node class
- * @template D The Document class
- */
- export class HTMLMathItem<N, T, D> extends AbstractMathItem<N, T, D> {
- /**
- * Easy access to DOM adaptor
- */
- get adaptor() {
- return this.inputJax.adaptor;
- }
- /**
- * @override
- */
- constructor(math: string, jax: InputJax<N, T, D>, display: boolean = true,
- start: Location<N, T> = {node: null, n: 0, delim: ''},
- end: Location<N, T> = {node: null, n: 0, delim: ''}) {
- super(math, jax, display, start, end);
- }
- /**
- * Insert the typeset MathItem into the document at the right location
- * If the starting and ending nodes are the same:
- * Split the text to isolate the math and its delimiters
- * Replace the math by the typeset version
- * Otherewise (spread over several nodes)
- * Split the start node, if needed
- * Remove nodes until we reach the end node
- * Insert the math before the end node
- * Split the end node, if needed
- * Remove the end node
- *
- * @override
- */
- public updateDocument(_html: HTMLDocument<N, T, D>) {
- if (this.state() < STATE.INSERTED) {
- if (this.inputJax.processStrings) {
- let node = this.start.node as T;
- if (node === this.end.node) {
- if (this.end.n && this.end.n < this.adaptor.value(this.end.node).length) {
- this.adaptor.split(this.end.node, this.end.n);
- }
- if (this.start.n) {
- node = this.adaptor.split(this.start.node as T, this.start.n);
- }
- this.adaptor.replace(this.typesetRoot, node);
- } else {
- if (this.start.n) {
- node = this.adaptor.split(node, this.start.n);
- }
- while (node !== this.end.node) {
- let next = this.adaptor.next(node) as T;
- this.adaptor.remove(node);
- node = next;
- }
- this.adaptor.insert(this.typesetRoot, node);
- if (this.end.n < this.adaptor.value(node).length) {
- this.adaptor.split(node, this.end.n);
- }
- this.adaptor.remove(node);
- }
- } else {
- this.adaptor.replace(this.typesetRoot, this.start.node);
- }
- this.start.node = this.end.node = this.typesetRoot;
- this.start.n = this.end.n = 0;
- this.state(STATE.INSERTED);
- }
- }
- /**
- * Update the style sheet for any changes due to rerendering
- *
- * @param {HTMLDocument} document The document whose styles are to be updated
- */
- public updateStyleSheet(document: HTMLDocument<N, T, D>) {
- document.addStyleSheet();
- }
- /**
- * Remove the typeset math from the document, and put back the original
- * expression and its delimiters, if requested.
- *
- * @override
- */
- public removeFromDocument(restore: boolean = false) {
- if (this.state() >= STATE.TYPESET) {
- const adaptor = this.adaptor;
- let node = this.start.node;
- let math: N | T = adaptor.text('');
- if (restore) {
- let text = this.start.delim + this.math + this.end.delim;
- if (this.inputJax.processStrings) {
- math = adaptor.text(text);
- } else {
- const doc = adaptor.parse(text, 'text/html');
- math = adaptor.firstChild(adaptor.body(doc));
- }
- }
- if (adaptor.parent(node)) {
- adaptor.replace(math, node);
- }
- this.start.node = this.end.node = math;
- this.start.n = this.end.n = 0;
- }
- }
- }
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