stuff

node_modules/mathjax-full/ts/input/tex/newcommand/NewcommandItems.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 Items for TeX parsing of new environments.
+ *
+ * @author v.sorge@mathjax.org (Volker Sorge)
+ */
+
+
+import TexError from '../TexError.js';
+import {CheckType, BaseItem, StackItem} from '../StackItem.js';
+
+
+/**
+ * Opening Item dealing with definitions of new environments. It's pushed onto
+ * the stack whenever a user defined environment is encountered and remains
+ * until a corresponding \\end collapses the stack.
+ */
+export class BeginEnvItem extends BaseItem {
+
+  /**
+   * @override
+   */
+  public get kind() {
+    return 'beginEnv';
+  }
+
+
+  /**
+   * @override
+   */
+  get isOpen() {
+    return true;
+  }
+
+
+  /**
+   * @override
+   */
+  public checkItem(item: StackItem): CheckType {
+    if (item.isKind('end')) {
+      // @test Newenvironment Empty, Newenvironment Align
+      if (item.getName() !== this.getName()) {
+        // @test (missing) \newenvironment{env}{aa}{bb}\begin{env}cc\end{equation}
+        throw new TexError('EnvBadEnd', '\\begin{%1} ended with \\end{%2}',
+                            this.getName(), item.getName());
+      }
+      return [[this.factory.create('mml', this.toMml())], true];
+    }
+    if (item.isKind('stop')) {
+      // @test (missing) \newenvironment{env}{aa}{bb}\begin{env}cc
+      throw new TexError('EnvMissingEnd', 'Missing \\end{%1}', this.getName());
+    }
+    // @test Newenvironment Empty, Newenvironment Align
+    return super.checkItem(item);
+  }
+
+}