[clang] [HLSL][RootSignature] Implement Lexing of DescriptorTables (PR #122981)

[Ashley Coleman via cfe-commits]

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@@ -0,0 +1,152 @@
+#include "clang/Parse/ParseHLSLRootSignature.h"
+
+namespace llvm {
+namespace hlsl {
+namespace root_signature {
+
+// Lexer Definitions
+
+static bool IsPreprocessorNumberChar(char C) {
+  // TODO: extend for float support with or without hexadecimal/exponent
+  return isdigit(C); // integer support
+}
+
+bool RootSignatureLexer::LexNumber(RootSignatureToken &Result) {
+  // NumericLiteralParser does not handle the sign so we will manually apply it
+  Result.Signed = Buffer.front() == '-';
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V-FEXrt wrote:

I'm assuming no, but is unary `+` allowed here?

https://github.com/llvm/llvm-project/pull/122981