89 lines
2.2 KiB
TypeScript
89 lines
2.2 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2018-2022 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 Items for TeX parsing of bussproofs.
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*
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* @author v.sorge@mathjax.org (Volker Sorge)
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*/
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import TexError from '../TexError.js';
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import {BaseItem, CheckType, StackItem} from '../StackItem.js';
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import {MmlNode} from '../../../core/MmlTree/MmlNode.js';
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import Stack from '../Stack.js';
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import * as BussproofsUtil from './BussproofsUtil.js';
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export class ProofTreeItem extends BaseItem {
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/**
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* The current left label.
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* @type {MmlNode[]}
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*/
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public leftLabel: MmlNode[] = null;
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/**
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* The current right label.
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* @type {MmlNode[]}
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*/
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public rigthLabel: MmlNode[] = null;
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private innerStack: Stack = new Stack(this.factory, {}, true);
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/**
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* @override
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*/
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public get kind() {
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return 'proofTree';
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}
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/**
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* @override
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*/
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public checkItem(item: StackItem): CheckType {
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if (item.isKind('end') && item.getName() === 'prooftree') {
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let node = this.toMml();
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BussproofsUtil.setProperty(node, 'proof', true);
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return [[this.factory.create('mml', node), item], true];
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}
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if (item.isKind('stop')) {
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throw new TexError('EnvMissingEnd', 'Missing \\end{%1}', this.getName());
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}
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this.innerStack.Push(item);
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return BaseItem.fail;
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}
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/**
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* @override
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*/
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public toMml() {
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const tree = super.toMml();
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const start = this.innerStack.Top();
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if (start.isKind('start') && !start.Size()) {
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return tree;
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}
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this.innerStack.Push(this.factory.create('stop'));
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let prefix = this.innerStack.Top().toMml();
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return this.create('node', 'mrow', [prefix, tree], {});
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}
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}
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