Nathan =?utf-8?q?Gauër?= <brio...@google.com>,
Nathan =?utf-8?q?Gauër?= <brio...@google.com>,
Nathan =?utf-8?q?Gauër?= <brio...@google.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/152...@github.com>
================
@@ -118,6 +118,47 @@ static void fixSeparateAttrArgAndNumber(StringRef ArgStr,
SourceLocation ArgLoc,
Slot = new (Ctx) IdentifierLoc(ArgLoc, PP.getIdentifierInfo(FixedArg));
}
+Parser::ParsedSemantic Parser::ParseHLSLSemantic() {
+ assert(Tok.is(tok::identifier) && "Not a HLSL Annotation");
+
+ // Semantic pattern: [A-Za-z_]([A-Za-z_0-9]*[A-Za-z_])?[0-9]*
+ // The first part is the semantic name, the second is the optional
+ // semantic index. The semantic index is the number at the end of
+ // the semantic, including leading zeroes. Digits located before
+ // the last letter are part of the semantic name.
+ bool Invalid = false;
+ SmallString<256> Buffer;
+ Buffer.resize(Tok.getLength() + 1);
+ StringRef Identifier = PP.getSpelling(Tok, Buffer);
+ if (Invalid) {
+ Diag(Tok.getLocation(), diag::err_expected_semantic_identifier);
+ return {};
+ }
+
+ assert(Identifier.size() > 0);
+ unsigned I = Identifier.size();
+ for (; I > 0 && isDigit(Identifier[I - 1]); --I)
----------------
llvm-beanz wrote:
Also as a follow-up it would be nice if `llvm::StringRef` had a utility for
this. Currently it has a bunch of find and reverse-find methods, but it doesn't
have an ideal fit. `find_if_not` is probably the right pattern, but you'd want
an `rfind_if_not` so that this could be something like:
```c++
size_t I = Identifier.rfind_if_not(isDigit);
```
https://github.com/llvm/llvm-project/pull/152537
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