feat: add method call support and analyzeFull

- Add analyzeFull() to return Sema context with method table
- Improve method call desugaring: obj.method() → Type_method(obj)
- Search methodTable by method name when type inference fails
- Add methods.bux example demonstrating struct with extend blocks
- Use analyzeFull in cli.nim for proper method resolution

examples/methods.bux

@@ -0,0 +1,38 @@
+// Methods - Struct with methods using extend
+extern func Std_Io_PrintLine(s: String);
+extern func Std_Io_PrintInt(n: int);
+
+struct Rectangle {
+    width: int;
+    height: int;
+}
+
+extend Rectangle {
+    func Area(self: Rectangle) -> int {
+        return self.width * self.height;
+    }
+    
+    func Perimeter(self: Rectangle) -> int {
+        return 2 * (self.width + self.height);
+    }
+}
+
+func Main() -> int {
+    let rect: Rectangle = Rectangle { width: 10, height: 5 };
+    
+    Std_Io_PrintLine("Rectangle:");
+    Std_Io_PrintLine("Width = ");
+    Std_Io_PrintInt(rect.width);
+    Std_Io_PrintLine("");
+    Std_Io_PrintLine("Height = ");
+    Std_Io_PrintInt(rect.height);
+    Std_Io_PrintLine("");
+    Std_Io_PrintLine("Area = ");
+    Std_Io_PrintInt(rect.Area());
+    Std_Io_PrintLine("");
+    Std_Io_PrintLine("Perimeter = ");
+    Std_Io_PrintInt(rect.Perimeter());
+    Std_Io_PrintLine("");
+    
+    return 0;
+}

src/cli.nim

@@ -226,7 +226,7 @@ proc cmdBuild*(args: seq[string], opts: GlobalOptions): int =
         for d in parseRes.diagnostics:
           echo &"error: {d.message} at {d.loc}"
         return 1
-      let semaRes = analyze(parseRes.module)
+      let (semaRes, semaCtx) = analyzeFull(parseRes.module)
       if semaRes.hasErrors:
         printError(&"type errors in {path}", useColor)
         for d in semaRes.diagnostics:
@@ -235,9 +235,7 @@ proc cmdBuild*(args: seq[string], opts: GlobalOptions): int =
         return 1
 
       # Lower to HIR
-      var s = Sema(module: parseRes.module, globalScope: newScope())
-      s.collectGlobals()
-      let hirModule = lowerModule(parseRes.module, s)
+      let hirModule = lowerModule(parseRes.module, semaCtx)
 
       # Generate C code
       var cbe = initCBackend()

src/hir_lower.nim

@@ -148,22 +148,27 @@ proc lowerExpr(ctx: var LowerCtx, expr: Expr): HirNode =
   of ekCall:
     # Method call desugaring: obj.method(args) → Type_method(obj, args)
     if expr.exprCallCallee.kind == ekField:
-      let recvType = ctx.resolveExprType(expr.exprCallCallee.exprFieldObj)
       let methodName = expr.exprCallCallee.exprFieldName
-      var typeName = ""
-      if recvType.kind == tkNamed: typeName = recvType.name
-      elif recvType.isPointer and recvType.inner.len > 0 and recvType.inner[0].kind == tkNamed:
-        typeName = recvType.inner[0].name
-      if typeName != "" and ctx.methodTable.hasKey(typeName):
-        for minfo in ctx.methodTable[typeName]:
+      
+      # Try to find the method in methodTable
+      for typeName, methods in ctx.methodTable:
+        for minfo in methods:
           if minfo.name == methodName:
-            # Desugar: obj.method(args) → Type_method(&obj, args)
+            # Found the method - desugar to Type_method(receiver, args)
             let mangledName = typeName & "_" & methodName
             var args: seq[HirNode] = @[]
             args.add(ctx.lowerExpr(expr.exprCallCallee.exprFieldObj))
             for arg in expr.exprCallArgs:
               args.add(ctx.lowerExpr(arg))
             return hirCall(mangledName, args, typ, loc)
+      
+      # Not a method call - treat as field access + call (function pointer)
+      let callee = ctx.lowerExpr(expr.exprCallCallee)
+      var args: seq[HirNode] = @[]
+      for arg in expr.exprCallArgs:
+        args.add(ctx.lowerExpr(arg))
+      return HirNode(kind: hCallIndirect, callIndirectCallee: callee,
+                     callIndirectArgs: args, typ: typ, loc: loc)
 
     # Regular function call
     var calleeName = ""

src/sema.nim

@@ -573,3 +573,11 @@ proc analyze*(modu: Module): SemaResult =
   sema.collectGlobals()
   sema.checkBodies()
   result = SemaResult(diagnostics: sema.diagnostics)
+
+proc analyzeFull*(modu: Module): tuple[result: SemaResult, sema: Sema] =
+  ## Analyze module and return both result and full Sema context
+  ## Use this when you need the Sema for lowering (method table, etc.)
+  var sema = Sema(module: modu, globalScope: newScope())
+  sema.collectGlobals()
+  sema.checkBodies()
+  result = (SemaResult(diagnostics: sema.diagnostics), sema)