[clang] [Clang][Comments] Add argument parsing for @throw @throws @exception (PR #84726)

[via cfe-commits]

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@@ -149,6 +174,54 @@ class TextTokenRetokenizer {
     addToken();
   }
 
+  /// Extract a type argument
+  bool lexType(Token &Tok) {
+    if (isEnd())
+      return false;
+
+    // Save current position in case we need to rollback because the type is
+    // empty.
+    Position SavedPos = Pos;
+
+    // Consume any leading whitespace.
+    consumeWhitespace();
+    SmallString<32> WordText;
+    const char *WordBegin = Pos.BufferPtr;
+    SourceLocation Loc = getSourceLocation();
+
+    while (!isEnd()) {
+      const char C = peek();
+      // For non-whitespace characters we check if it's a template or otherwise
+      // continue reading the text into a word.
+      if (!isWhitespace(C)) {
+        if (C == '<') {
+          if (!lexTemplate(WordText))
+            return false;
+        } else {
+          WordText.push_back(C);
+          consumeChar();
+        }
+      } else {
+        consumeChar();
+        break;
+      }
+    }
+
+    const unsigned Length = WordText.size();
+    if (Length == 0) {
+      Pos = SavedPos;
+      return false;
+    }
+
+    char *TextPtr = Allocator.Allocate<char>(Length + 1);
+
+    memcpy(TextPtr, WordText.c_str(), Length + 1);
+    StringRef Text = StringRef(TextPtr, Length);
+
+    formTokenWithChars(Tok, Loc, WordBegin, Length, Text);
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cor3ntin wrote:

I'd like to see that extracted in a separate function (and replace the few places where we do the exact same thing)

https://github.com/llvm/llvm-project/pull/84726