[clang] [clang-format] Support of TableGen identifiers beginning with a number. (PR #78571)

[Björn Schäpers via cfe-commits]

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@@ -804,6 +806,46 @@ void FormatTokenLexer::handleTableGenMultilineString() {
       FirstLineText, MultiLineString->OriginalColumn, Style.TabWidth, Encoding);
 }
 
+void FormatTokenLexer::handleTableGenNumericLikeIdentifier() {
+  FormatToken *Tok = Tokens.back();
+  // TableGen identifiers can begin with digits. Such tokens are lexed as
+  // numeric_constant now.
+  if (Tok->isNot(tok::numeric_constant))
+    return;
+  StringRef Text = Tok->TokenText;
+  // Identifiers cannot begin with + or -.
+  if (Text.size() < 1 || Text[0] == '+' || Text[0] == '-')
+    return;
+  // The following check is based on llvm::TGLexer::LexToken.
+  if (isdigit(Text[0])) {
+    size_t I = 0;
+    char NextChar = (char)0;
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HazardyKnusperkeks wrote:

No C-Style casts, also it's really unnecessary since you can just assign `0`.

https://github.com/llvm/llvm-project/pull/78571