[clang] [clang-format] Support of TableGen basic format restrictions. (PR #81611)

[Hirofumi Nakamura via cfe-commits]

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@@ -5822,6 +5860,24 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
       return false;
     if (Left.is(TT_TemplateString) && Left.opensScope())
       return true;
+  } else if (Style.isTableGen()) {
+    // Avoid to break after "def", "class", "let" and so on.
+    if (Keywords.isTableGenDefinition(Left))
+      return false;
+    // Avoid to break after '(' in the cases that is in bang operators.
+    if (Right.is(tok::l_paren)) {
+      return !Left.isOneOf(TT_TableGenBangOperator, TT_TableGenCondOperator,
+                           TT_TemplateCloser);
+    }
+    // Avoid to split the value and its suffix part.
+    if (Left.is(TT_TableGenValueSuffix))
+      return false;
+    // Avoid to break between the value and its suffix part.
+    if (Left.is(TT_TableGenValueSuffix))
+      return false;
+    // Avoid to break around paste operator.
+    if (Left.is(tok::hash) || Right.is(tok::hash))
+      return false;
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hnakamura5 wrote:

Returning false does not allow to insert line break before Right token.

https://github.com/llvm/llvm-project/pull/81611