================
@@ -0,0 +1,139 @@
+#include "clang/Sema/ParseHLSLRootSignature.h"
+
+namespace llvm {
+namespace hlsl {
+namespace root_signature {
+
+// TODO: Hook up with Sema to properly report semantic/validation errors
+bool Parser::ReportError() { return true; }
+
+bool Parser::ParseRootFlags() {
+ // Set to RootFlags::None and skip whitespace to catch when we have
RootFlags(
+ // )
+ RootFlags Flags = RootFlags::None;
+ Buffer = Buffer.drop_while(isspace);
+ StringLiteral Prefix = "";
+
+ // Loop until we reach the end of the rootflags
+ while (!Buffer.starts_with(")")) {
+ // Trim expected | when more than 1 flag
+ if (!Buffer.consume_front(Prefix))
+ return ReportError();
+ Prefix = "|";
+
+ // Remove any whitespace
+ Buffer = Buffer.drop_while(isspace);
+
+ RootFlags CurFlag;
+ if (ParseRootFlag(CurFlag))
+ return ReportError();
+ Flags |= CurFlag;
+
+ // Remove any whitespace
+ Buffer = Buffer.drop_while(isspace);
+ }
+
+ // Create and push the root element on the parsed elements
+ Elements->push_back(RootElement(Flags));
+ return false;
+}
+
+template <typename EnumType>
+bool Parser::ParseEnum(SmallVector<std::pair<StringLiteral, EnumType>> Mapping,
+ EnumType &Enum) {
+ // Retrieve enum
+ Token = Buffer.take_while([](char C) { return isalnum(C) || C == '_'; });
+ Buffer = Buffer.drop_front(Token.size());
+
+ // Try to get the case-insensitive enum
+ auto Switch = llvm::StringSwitch<std::optional<EnumType>>(Token);
+ for (auto Pair : Mapping)
+ Switch.CaseLower(Pair.first, Pair.second);
+ auto MaybeEnum = Switch.Default(std::nullopt);
+ if (!MaybeEnum)
+ return true;
+ Enum = *MaybeEnum;
+
+ return false;
+}
+
+bool Parser::ParseRootFlag(RootFlags &Flag) {
+ SmallVector<std::pair<StringLiteral, RootFlags>> Mapping = {
----------------
llvm-beanz wrote:
Is there a reason for this to not be a `llvm::StringSwitch` instead?
https://github.com/llvm/llvm-project/pull/121799
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