stuff

node_modules/mathjax-full/ts/input/tex/mhchem/MhchemConfiguration.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 Configuration file for the mhchem package.
+ *
+ * @author v.sorge@mathjax.org (Volker Sorge)
+ */
+
+import {Configuration} from '../Configuration.js';
+import {CommandMap} from '../SymbolMap.js';
+import {ParseMethod} from '../Types.js';
+import TexError from '../TexError.js';
+import TexParser from '../TexParser.js';
+import BaseMethods from '../base/BaseMethods.js';
+import {AmsMethods} from '../ams/AmsMethods.js';
+import {mhchemParser} from 'mhchemparser/dist/mhchemParser.js';
+
+// Namespace
+let MhchemMethods: Record<string, ParseMethod> = {};
+
+MhchemMethods.Macro = BaseMethods.Macro;
+MhchemMethods.xArrow = AmsMethods.xArrow;
+
+/**
+ * @param{TeXParser} parser   The parser for this expression
+ * @param{string} name        The macro name being called
+ * @param{string} machine     The name of the fininte-state machine to use
+ */
+MhchemMethods.Machine = function(parser: TexParser, name: string, machine: 'tex' | 'ce' | 'pu') {
+  let arg = parser.GetArgument(name);
+  let tex;
+  try {
+    tex = mhchemParser.toTex(arg, machine);
+  } catch (err) {
+    throw new TexError(err[0], err[1]);
+  }
+  parser.string = tex + parser.string.substr(parser.i);
+  parser.i = 0;
+};
+
+new CommandMap(
+  'mhchem', {
+    ce: ['Machine', 'ce'],
+    pu: ['Machine', 'pu'],
+    longrightleftharpoons: [
+      'Macro',
+      '\\stackrel{\\textstyle{-}\\!\\!{\\rightharpoonup}}{\\smash{{\\leftharpoondown}\\!\\!{-}}}'
+    ],
+    longRightleftharpoons: [
+      'Macro',
+      '\\stackrel{\\textstyle{-}\\!\\!{\\rightharpoonup}}{\\smash{\\leftharpoondown}}'
+    ],
+    longLeftrightharpoons: [
+      'Macro',
+      '\\stackrel{\\textstyle\\vphantom{{-}}{\\rightharpoonup}}{\\smash{{\\leftharpoondown}\\!\\!{-}}}'
+    ],
+    longleftrightarrows: [
+      'Macro',
+      '\\stackrel{\\longrightarrow}{\\smash{\\longleftarrow}\\Rule{0px}{.25em}{0px}}'
+    ],
+    //
+    //  Needed for \bond for the ~ forms
+    //
+    tripledash: [
+      'Macro',
+      '\\vphantom{-}\\raise2mu{\\kern2mu\\tiny\\text{-}\\kern1mu\\text{-}\\kern1mu\\text{-}\\kern2mu}'
+    ],
+    xleftrightarrow:    ['xArrow', 0x2194, 6, 6],
+    xrightleftharpoons: ['xArrow', 0x21CC, 5, 7],   // FIXME:  doesn't stretch in HTML-CSS output
+    xRightleftharpoons: ['xArrow', 0x21CC, 5, 7],   // FIXME:  how should this be handled?
+    xLeftrightharpoons: ['xArrow', 0x21CC, 5, 7]
+  },
+  MhchemMethods
+);
+
+
+export const MhchemConfiguration = Configuration.create(
+  'mhchem', {handler: {macro: ['mhchem']}}
+);