[clang] [clang-format] Add an option to format integer and float literal case (PR #151590)

[Björn Schäpers via cfe-commits]

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@@ -3558,6 +3558,76 @@ struct FormatStyle {
   /// \version 9
   std::vector<std::string> NamespaceMacros;
 
+  /// Control over each component in a numeric literal.
+  enum NumericLiteralComponentStyle : int8_t {
+    /// Leave this component of the literal as is.
+    NLCS_Leave,
+    /// Always format this component with upper case characters.
+    NLCS_Always,
+    /// Never format this component with upper case characters.
+    NLCS_Never,
+  };
+
+  /// Character case format for different components of a numeric literal.
+  struct NumericLiteralCaseStyle {
+    /// Format floating point exponent separator character case.
+    /// \code{.text}
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HazardyKnusperkeks wrote:

Why `.text`?

https://github.com/llvm/llvm-project/pull/151590