90 lines
2.5 KiB
TypeScript
90 lines
2.5 KiB
TypeScript
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/*************************************************************
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*
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* Copyright (c) 2009-2022 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 Stack items for parsing the braket package.
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*
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* @author v.sorge@mathjax.org (Volker Sorge)
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*/
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import {CheckType, BaseItem, StackItem} from '../StackItem.js';
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import {TEXCLASS} from '../../../core/MmlTree/MmlNode.js';
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import ParseUtil from '../ParseUtil.js';
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/**
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* A bra-ket command. Collates elements from the opening brace to the closing
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* brace, adding bars to a given maximal number (e.g., only one in case of
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* set). To finalise it adds the surrounding angle brackets or braces.
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*/
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export class BraketItem extends BaseItem {
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/**
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* @override
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*/
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get kind() {
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return 'braket';
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}
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/**
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* @override
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*/
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get isOpen() {
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return true;
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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('close')) {
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return [[this.factory.create('mml', this.toMml())], true];
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}
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if (item.isKind('mml')) {
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this.Push(item.toMml());
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if (this.getProperty('single')) {
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return [[this.toMml()], true];
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}
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return BaseItem.fail;
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}
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return super.checkItem(item);
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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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let inner = super.toMml();
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let open = this.getProperty('open') as string;
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let close = this.getProperty('close') as string;
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if (this.getProperty('stretchy')) {
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return ParseUtil.fenced(this.factory.configuration, open, inner, close);
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}
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let attrs = {fence: true, stretchy: false, symmetric: true, texClass: TEXCLASS.OPEN};
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let openNode = this.create('token', 'mo', attrs, open);
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attrs.texClass = TEXCLASS.CLOSE;
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let closeNode = this.create('token', 'mo', attrs, close);
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let mrow = this.create('node', 'mrow', [openNode, inner, closeNode],
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{open: open, close: close, texClass: TEXCLASS.INNER});
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return mrow;
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}
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}
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