From fd3a4539fbdba97a0c0796cf3347a64c05fd716b Mon Sep 17 00:00:00 2001
From: Chris Anders <filmee24@gmail.com>
Date: Fri, 7 Feb 2025 06:54:43 +0000
Subject: [PATCH] feat: Add global variable declarations

---
 .../Parsing/Parser.ParsePoints.cs              |  1 +
 .../Listeners/CollectFunctionsListener.cs      |  2 +-
 .../CollectGlobalVariablesListener.cs          | 18 ++++++++++++++++++
 .../SocordiaC/Stages/CollectTypesStage.cs      |  8 ++++++--
 NewSource/SocordiaC/hello.scs                  |  2 ++
 5 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 NewSource/SocordiaC/Compilation/Listeners/CollectGlobalVariablesListener.cs

diff --git a/NewSource/Socordia.CodeAnalysis/Parsing/Parser.ParsePoints.cs b/NewSource/Socordia.CodeAnalysis/Parsing/Parser.ParsePoints.cs
index b1248386..2c0faaac 100644
--- a/NewSource/Socordia.CodeAnalysis/Parsing/Parser.ParsePoints.cs
+++ b/NewSource/Socordia.CodeAnalysis/Parsing/Parser.ParsePoints.cs
@@ -30,6 +30,7 @@ public void InitParsePoints()
 
         AddDeclarationParsePoint<FunctionDefinitionParser>(TokenType.Function);
         AddDeclarationParsePoint<RulesForDeclarationParser>(TokenType.Rules);
+        AddDeclarationParsePoint<VariableStatementParser>(TokenType.Let);
 
         /*  AddDeclarationParsePoint<ConstructorDeclarationParser>(TokenType.Constructor);
           AddDeclarationParsePoint<DestructorDeclaration>(TokenType.Destructor);
diff --git a/NewSource/SocordiaC/Compilation/Listeners/CollectFunctionsListener.cs b/NewSource/SocordiaC/Compilation/Listeners/CollectFunctionsListener.cs
index c8e0607d..69b6168e 100644
--- a/NewSource/SocordiaC/Compilation/Listeners/CollectFunctionsListener.cs
+++ b/NewSource/SocordiaC/Compilation/Listeners/CollectFunctionsListener.cs
@@ -22,7 +22,7 @@ protected override void ListenToNode(Driver context, FunctionDefinition node)
 
         var returnType = GetReturnType(node, type);
         var method = type.CreateMethod(node.Signature.Name.Name,
-            returnType, [..parameters], attrs);
+            returnType, [.. parameters], attrs);
 
         if (!node.Modifiers.Contains(Modifier.Extern))
         {
diff --git a/NewSource/SocordiaC/Compilation/Listeners/CollectGlobalVariablesListener.cs b/NewSource/SocordiaC/Compilation/Listeners/CollectGlobalVariablesListener.cs
new file mode 100644
index 00000000..ac00aa9a
--- /dev/null
+++ b/NewSource/SocordiaC/Compilation/Listeners/CollectGlobalVariablesListener.cs
@@ -0,0 +1,18 @@
+namespace SocordiaC.Compilation.Listeners;
+
+public class CollectGlobalVariablesListener : Listeners<Driver, AstNode, VariableStatement>
+{
+    protected override void ListenToNode(Driver context, VariableStatement node)
+    {
+        var type = context.GetFunctionType(context.GetNamespaceOf(node));
+        var varType = Utils.GetTypeFromNode(node.Type, type);
+        var field = type.CreateField(node.Name, varType, FieldAttributes.Public | FieldAttributes.Static);
+
+        Mappings.Variables.Add(node, field);
+    }
+
+    protected override bool ShouldListenToChildren(Driver context, VariableStatement node)
+    {
+        return false;
+    }
+}
diff --git a/NewSource/SocordiaC/Stages/CollectTypesStage.cs b/NewSource/SocordiaC/Stages/CollectTypesStage.cs
index 91ff31ed..4da67f2c 100644
--- a/NewSource/SocordiaC/Stages/CollectTypesStage.cs
+++ b/NewSource/SocordiaC/Stages/CollectTypesStage.cs
@@ -26,10 +26,14 @@ public async Task<Driver> HandleAsync(Driver context, Func<Driver, Task<Driver>>
         }
 
         var functionCollector = new CollectFunctionsListener();
+        var globalVarListener = new CollectGlobalVariablesListener();
         foreach (var tree in context.Trees)
-        foreach (var decl in tree.Declarations.Children)
         {
-            functionCollector.Listen(context, decl);
+            foreach (var decl in tree.Declarations.Children)
+            {
+                functionCollector.Listen(context, decl);
+                globalVarListener.Listen(context, decl);
+            }
         }
 
         return await next.Invoke(context);
diff --git a/NewSource/SocordiaC/hello.scs b/NewSource/SocordiaC/hello.scs
index d50ff63a..061c428f 100644
--- a/NewSource/SocordiaC/hello.scs
+++ b/NewSource/SocordiaC/hello.scs
@@ -5,6 +5,8 @@ public enum Color {
     Blue
 }
 
+let defaultColor: Color;
+
 func main()
 {
      let mut x = 12;