add initial marp implementation with sample content and build configuration

node_modules/mathjax-full/ts/input/tex/bussproofs/BussproofsItems.ts

@@ -0,0 +1,88 @@
+/*************************************************************
+ *
+ *  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 bussproofs.
+ *
+ * @author v.sorge@mathjax.org (Volker Sorge)
+ */
+
+
+import TexError from '../TexError.js';
+import {BaseItem, CheckType, StackItem} from '../StackItem.js';
+import {MmlNode} from '../../../core/MmlTree/MmlNode.js';
+import Stack from '../Stack.js';
+import * as BussproofsUtil from './BussproofsUtil.js';
+
+
+export class ProofTreeItem extends BaseItem {
+
+
+  /**
+   * The current left label.
+   * @type {MmlNode[]}
+   */
+  public leftLabel: MmlNode[] = null;
+
+  /**
+   * The current right label.
+   * @type {MmlNode[]}
+   */
+  public rigthLabel: MmlNode[] = null;
+
+  private innerStack: Stack = new Stack(this.factory, {}, true);
+
+  /**
+   * @override
+   */
+  public get kind() {
+    return 'proofTree';
+  }
+
+
+  /**
+   * @override
+   */
+  public checkItem(item: StackItem): CheckType {
+    if (item.isKind('end') && item.getName() === 'prooftree') {
+      let node = this.toMml();
+      BussproofsUtil.setProperty(node, 'proof', true);
+      return [[this.factory.create('mml', node), item], true];
+    }
+    if (item.isKind('stop')) {
+      throw new TexError('EnvMissingEnd', 'Missing \\end{%1}', this.getName());
+    }
+    this.innerStack.Push(item);
+    return BaseItem.fail;
+  }
+
+
+  /**
+   * @override
+   */
+  public toMml() {
+    const tree = super.toMml();
+    const start = this.innerStack.Top();
+    if (start.isKind('start') && !start.Size()) {
+      return tree;
+    }
+    this.innerStack.Push(this.factory.create('stop'));
+    let prefix = this.innerStack.Top().toMml();
+    return this.create('node', 'mrow', [prefix, tree], {});
+  }
+}