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node_modules/mathjax-full/ts/input/tex/braket/BraketMethods.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 Methods for TeX parsing of the braket package.
+ *
+ * @author v.sorge@mathjax.org (Volker Sorge)
+ */
+
+import {ParseMethod} from '../Types.js';
+import BaseMethods from '../base/BaseMethods.js';
+import TexParser from '../TexParser.js';
+import {TEXCLASS} from '../../../core/MmlTree/MmlNode.js';
+import TexError from '../TexError.js';
+
+
+let BraketMethods: Record<string, ParseMethod> = {};
+
+BraketMethods.Macro = BaseMethods.Macro;
+
+
+/**
+ * Generate a bra-ket expression.
+ * @param {TexParser} parser The current TeX parser.
+ * @param {string} name Name of the current control sequence.
+ * @param {string} open Opening delimiter.
+ * @param {string} close Closing delimiter.
+ * @param {boolean} stretchy Is it stretchy.
+ * @param {number} barmax Maximum number of bars allowed.
+ */
+BraketMethods.Braket = function(parser: TexParser, _name: string,
+                                open: string, close: string,
+                                stretchy: boolean, barmax: number) {
+  let next = parser.GetNext();
+  if (next === '') {
+    throw new TexError('MissingArgFor', 'Missing argument for %1', parser.currentCS);
+  }
+  let single = true;
+  if (next === '{') {
+    parser.i++;
+    single = false;
+  }
+  parser.Push(
+    parser.itemFactory.create('braket')
+      .setProperties({barmax: barmax, barcount: 0, open: open,
+                      close: close, stretchy: stretchy, single: single}));
+};
+
+
+/**
+ * Generate a bar. If inside a bra-ket expressions it's handled accordingly.
+ * @param {TexParser} parser The current TeX parser.
+ * @param {string} name Name of the current control sequence.
+ */
+BraketMethods.Bar = function(parser: TexParser, name: string) {
+  let c = name === '|' ? '|' : '\u2225';
+  let top = parser.stack.Top();
+  if (top.kind !== 'braket' ||
+      top.getProperty('barcount') >= top.getProperty('barmax')) {
+    let mml = parser.create('token', 'mo', {texClass: TEXCLASS.ORD, stretchy: false}, c);
+    parser.Push(mml);
+    return;
+  }
+  if (c === '|' && parser.GetNext() === '|') {
+    parser.i++;
+    c = '\u2225';
+  }
+  let stretchy = top.getProperty('stretchy');
+  if (!stretchy) {
+    let node = parser.create('token', 'mo', {stretchy: false, braketbar: true}, c);
+    parser.Push(node);
+    return;
+  }
+  let node = parser.create('node', 'TeXAtom', [], {texClass: TEXCLASS.CLOSE});
+  parser.Push(node);
+  top.setProperty('barcount', top.getProperty('barcount') as number + 1);
+  node = parser.create('token', 'mo', {stretchy: true, braketbar: true}, c);
+  parser.Push(node);
+  node = parser.create('node', 'TeXAtom', [], {texClass: TEXCLASS.OPEN});
+  parser.Push(node);
+};
+
+
+export default BraketMethods;