101 lines
3.6 KiB
TypeScript
101 lines
3.6 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2019-2022 The MathJax Consortium
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview A visitor to serialize MathML taking menu settings into account
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*
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* @author dpvc@mathjax.org (Davide Cervone)
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*/
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import {MathItem} from '../../core/MathItem.js';
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import {MmlNode} from '../../core/MmlTree/MmlNode.js';
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import {SerializedMmlVisitor} from '../../core/MmlTree/SerializedMmlVisitor.js';
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import {OptionList, userOptions} from '../../util/Options.js';
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/*==========================================================================*/
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/**
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* The visitor to serialize MathML
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*
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* @template N The HTMLElement node class
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* @template T The Text node class
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* @template D The Document class
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*/
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export class MmlVisitor<N, T, D> extends SerializedMmlVisitor {
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/**
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* The options controlling the serialization
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*/
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public options: OptionList = {
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texHints: true, // True means include classes for TeXAtom elements
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semantics: false, // True means include original form as annotation in a semantics element
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};
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/**
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* The MathItem currently being processed
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*/
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public mathItem: MathItem<N, T, D> = null;
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/**
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* @param {MmlNode} node The internal MathML node to serialize
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* @param {MathItem} math The MathItem for this node
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* @param {OptionList} options The options controlling the processing
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* @override
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*/
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public visitTree(node: MmlNode, math: MathItem<N, T, D> = null, options: OptionList = {}) {
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this.mathItem = math;
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userOptions(this.options, options);
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return this.visitNode(node, '');
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}
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/**
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* @override
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*/
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public visitTeXAtomNode(node: MmlNode, space: string) {
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if (this.options.texHints) {
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return super.visitTeXAtomNode(node, space);
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}
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if (node.childNodes[0] && node.childNodes[0].childNodes.length === 1) {
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return this.visitNode(node.childNodes[0], space);
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}
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return space + '<mrow' + this.getAttributes(node) + '>\n'
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+ this.childNodeMml(node, space + ' ', '\n')
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+ space + '</mrow>';
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}
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/**
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* @param {MmlNode} node The math node to visit
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* @param {string} space The number of spaces to use for indentation
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* @returns {string} The serialized math element
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*/
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public visitMathNode(node: MmlNode, space: string): string {
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if (!this.options.semantics || this.mathItem.inputJax.name !== 'TeX') {
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return super.visitDefault(node, space);
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}
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const addRow = node.childNodes.length && node.childNodes[0].childNodes.length > 1;
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return space + '<math' + this.getAttributes(node) + '>\n'
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+ space + ' <semantics>\n'
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+ (addRow ? space + ' <mrow>\n' : '')
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+ this.childNodeMml(node, space + (addRow ? ' ' : ' '), '\n')
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+ (addRow ? space + ' </mrow>\n' : '')
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+ space + ' <annotation encoding="application/x-tex">' + this.mathItem.math + '</annotation>\n'
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+ space + ' </semantics>\n'
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+ space + '</math>';
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}
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}
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