From 57547854c4533e6d0627b961120c0dc09e2e245a Mon Sep 17 00:00:00 2001
From: Jan <jan@laupetin.net>
Date: Thu, 18 Feb 2021 18:38:00 +0100
Subject: [PATCH] Parse forward declarations

---
 .../Domain/Definition/ForwardDeclaration.h    |  2 +-
 .../Header/Sequence/SequenceForwardDecl.cpp   | 30 ++++++++++++++++---
 .../Header/Sequence/SequenceForwardDecl.h     |  3 +-
 3 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/src/ZoneCodeGeneratorLib/Domain/Definition/ForwardDeclaration.h b/src/ZoneCodeGeneratorLib/Domain/Definition/ForwardDeclaration.h
index a7b221fa..89283ae7 100644
--- a/src/ZoneCodeGeneratorLib/Domain/Definition/ForwardDeclaration.h
+++ b/src/ZoneCodeGeneratorLib/Domain/Definition/ForwardDeclaration.h
@@ -6,7 +6,7 @@ class ForwardDeclaration final : public DataDefinition
 {
 public:
     const DataDefinitionType m_forwarded_type;
-    DataDefinition* m_definition;
+    const DataDefinition* m_definition;
 
     ForwardDeclaration(std::string _namespace, std::string name, DataDefinitionType type);
 
diff --git a/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.cpp b/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.cpp
index f840bb39..77dc1b60 100644
--- a/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.cpp
+++ b/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.cpp
@@ -9,10 +9,10 @@ SequenceForwardDecl::SequenceForwardDecl()
 
     AddMatchers({
         create.Or({
-            create.Type(HeaderParserValueType::ENUM),
-            create.Type(HeaderParserValueType::STRUCT),
-            create.Type(HeaderParserValueType::UNION)
-        }),
+            create.Type(HeaderParserValueType::ENUM).Tag(TAG_ENUM),
+            create.Type(HeaderParserValueType::STRUCT).Tag(TAG_STRUCT),
+            create.Type(HeaderParserValueType::UNION).Tag(TAG_UNION)
+        }).Capture(CAPTURE_TYPE),
         create.Identifier().Capture(CAPTURE_NAME),
         create.Char(';')
     });
@@ -20,4 +20,26 @@ SequenceForwardDecl::SequenceForwardDecl()
 
 void SequenceForwardDecl::ProcessMatch(HeaderParserState* state, SequenceResult<HeaderParserValue>& result) const
 {
+    const auto typeTag = result.NextTag();
+    DataDefinitionType type;
+
+    switch(typeTag)
+    {
+    case TAG_ENUM:
+        type = DataDefinitionType::ENUM;
+        break;
+
+    case TAG_STRUCT:
+        type = DataDefinitionType::STRUCT;
+        break;
+
+    case TAG_UNION:
+        type = DataDefinitionType::UNION;
+        break;
+
+    default:
+        throw ParsingException(result.NextCapture(CAPTURE_TYPE).GetPos(), "Unknown type");
+    }
+
+    state->AddForwardDeclaration(std::make_unique<ForwardDeclaration>(state->m_namespace.ToString(), result.NextCapture(CAPTURE_NAME).IdentifierValue(), type));
 }
diff --git a/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.h b/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.h
index dffa5e17..44304de2 100644
--- a/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.h
+++ b/src/ZoneCodeGeneratorLib/Parsing/Header/Sequence/SequenceForwardDecl.h
@@ -11,7 +11,8 @@ class SequenceForwardDecl final : public HeaderParser::sequence_t
     static constexpr auto TAG_STRUCT = 2;
     static constexpr auto TAG_UNION = 3;
 
-    static constexpr auto CAPTURE_NAME = 1;
+    static constexpr auto CAPTURE_TYPE = 1;
+    static constexpr auto CAPTURE_NAME = 2;
 
 protected:
     void ProcessMatch(HeaderParserState* state, SequenceResult<HeaderParserValue>& result) const override;