[Language Server]: Show signature help on generic parameters. (#7913)

* Show signature help on generic parameters.

* Fix.

* Update tests.

* slang-test: make vvl error go through stderr.

* update slang-rhi

* Update slang-rhi

1 files changed, 17 insertions, 4 deletions

diff --git a/source/slang/slang-parser.cpp b/source/slang/slang-parser.cpp
index 891db2867..7f7c39929 100644
--- a/source/slang/slang-parser.cpp
+++ b/source/slang/slang-parser.cpp
@@ -2356,14 +2356,27 @@ static Expr* parseGenericApp(Parser* parser, Expr* base)
 
     genericApp->loc = base->loc;
     genericApp->functionExpr = base;
-    parser->ReadToken(TokenType::OpLess);
+    auto opLess = parser->ReadToken(TokenType::OpLess);
+    genericApp->argumentDelimeterLocs.add(opLess.loc);
     parser->genericDepth++;
-    // For now assume all generics have at least one argument
-    genericApp->arguments.add(_parseGenericArg(parser));
-    while (AdvanceIf(parser, TokenType::Comma))
+
+    for (;;)
     {
+        if (parser->LookAheadToken(TokenType::OpGreater) ||
+            parser->LookAheadToken(TokenType::OpRsh))
+            break;
         genericApp->arguments.add(_parseGenericArg(parser));
+        if (parser->LookAheadToken(TokenType::Comma))
+        {
+            auto commaToken = parser->ReadToken(TokenType::Comma);
+            genericApp->argumentDelimeterLocs.add(commaToken.loc);
+        }
+        else
+        {
+            break;
+        }
     }
+    genericApp->argumentDelimeterLocs.add(parser->tokenReader.peekLoc());
     parser->genericDepth--;
 
     if (parser->tokenReader.peekToken().type == TokenType::OpRsh)