From 27a2459d91c36ba24b78155826ee8d80afb918ce Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 9 Aug 2026 21:39:21 +0100
Subject: Parse type params for struct definition

---
 .../ast/untyped/UntypedStructDefinitionNode.java   | 24 +++++++++++++++-------
 .../zwobble/hobgoblin/compiler/parser/Parser.java  |  2 ++
 2 files changed, 19 insertions(+), 7 deletions(-)

(limited to 'src/main/java')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedStructDefinitionNode.java b/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedStructDefinitionNode.java
index 0239ff8..9742068 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedStructDefinitionNode.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/ast/untyped/UntypedStructDefinitionNode.java
@@ -7,42 +7,52 @@ package org.zwobble.hobgoblin.compiler.ast.untyped;
 
 public record UntypedStructDefinitionNode(
     String name,
+    java.util.Optional<java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedTypeParamNode>> typeParams,
     java.util.Optional<java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructFieldDefinitionNode>> fields,
     org.zwobble.hobgoblin.compiler.ast.DocComment docComment,
     org.zwobble.hobgoblin.compiler.sources.Source source
 ) implements org.zwobble.hobgoblin.compiler.ast.untyped.UntypedNamespaceStatementNode {
     public static org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder arbitrary() {
-        return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder("", java.util.Optional.empty(), org.zwobble.hobgoblin.compiler.ast.HobgoblinNativeAst.arbitraryDocComment(), org.zwobble.hobgoblin.compiler.sources.HobgoblinNativeSources.arbitrarySource());
+        return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder("", java.util.Optional.empty(), java.util.Optional.empty(), org.zwobble.hobgoblin.compiler.ast.HobgoblinNativeAst.arbitraryDocComment(), org.zwobble.hobgoblin.compiler.sources.HobgoblinNativeSources.arbitrarySource());
     }
 
     public record Builder(
         String name,
+        java.util.Optional<java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedTypeParamNode>> typeParams,
         java.util.Optional<java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructFieldDefinitionNode>> fields,
         org.zwobble.hobgoblin.compiler.ast.DocComment docComment,
         org.zwobble.hobgoblin.compiler.sources.Source source
     ) implements org.zwobble.hobgoblin.compiler.ast.untyped.UntypedNamespaceStatementNode.Builder {
         public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode build() {
-            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode(name, fields, docComment, source);
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode(name, typeParams, fields, docComment, source);
         }
 
         public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withName(String name) {
-            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, fields, docComment, source);
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, typeParams, fields, docComment, source);
+        }
+
+        public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withTypeParams(java.util.Optional<java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedTypeParamNode>> typeParams) {
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, typeParams, fields, docComment, source);
+        }
+
+        public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withTypeParams(java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedTypeParamNode> typeParams) {
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, java.util.Optional.of(typeParams), fields, docComment, source);
         }
 
         public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withFields(java.util.Optional<java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructFieldDefinitionNode>> fields) {
-            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, fields, docComment, source);
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, typeParams, fields, docComment, source);
         }
 
         public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withFields(java.util.List<org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructFieldDefinitionNode> fields) {
-            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, java.util.Optional.of(fields), docComment, source);
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, typeParams, java.util.Optional.of(fields), docComment, source);
         }
 
         public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withDocComment(org.zwobble.hobgoblin.compiler.ast.DocComment docComment) {
-            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, fields, docComment, source);
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, typeParams, fields, docComment, source);
         }
 
         public org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder withSource(org.zwobble.hobgoblin.compiler.sources.Source source) {
-            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, fields, docComment, source);
+            return new org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder(name, typeParams, fields, docComment, source);
         }
 
         // Custom area start: org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode.Builder body
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java b/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java
index e66d271..12259ad 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java
@@ -212,6 +212,7 @@ public class Parser {
 
         tokens.skip(TokenType.KEYWORD_STRUCT);
         var name = tokens.next(TokenType.IDENTIFIER);
+        var typeParams = parseTypeParams(tokens);
         tokens.skip(TokenType.SYMBOL_BRACE_OPEN);
 
         var fields = parseStructDefinitionFields(tokens);
@@ -223,6 +224,7 @@ public class Parser {
 
         return new UntypedStructDefinitionNode(
             name.charSequence().toString(),
+            typeParams,
             fields,
             docComment,
             source
-- 
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