[clang-tools-extra] [clang-doc] Add Markdown AST node type definitions (PR #205609)

[Neil Nair via cfe-commits]

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@@ -0,0 +1,247 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Defines the Markdown AST node hierarchy for the clang-doc Markdown parser.
+///
+/// Block nodes represent structural constructs (paragraphs, headings, lists,
+/// fenced code blocks, etc). Inline nodes represent span-level content (text,
+/// emphasis, inline code) that appears inside block nodes.
+///
+/// All nodes are arena-allocated via ASTContext, which owns their lifetime.
+/// The parser builds the tree by calling push_back() on simple_ilist members.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_SUPPORT_MARKDOWN_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_DOC_SUPPORT_MARKDOWN_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/simple_ilist.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace clang::doc::markdown {
+
+enum class NodeKind {
+  // Inline nodes
+  NK_Text,
+  NK_InlineCode,
+  NK_Emphasis,
+  NK_Strong,
+  // Block nodes
+  NK_Paragraph,
+  NK_Heading,
+  NK_FencedCode,
+  NK_Table, // TODO: add TableNode
+  NK_UnorderedList,
+  NK_OrderedList,
+  NK_BlockQuote,
+  NK_ThematicBreak,
+  NK_Document,
+};
+
+struct InlineNode;
+struct BlockNode;
+
+//===----------------------------------------------------------------------===//
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Neil-N4 wrote:

Removed

https://github.com/llvm/llvm-project/pull/205609