add get expr analysis

- rename GetExpr.struc to GetExpr.target

src/ast.zig

@@ -128,7 +128,7 @@ pub const StructExpr = struct {
 };
 
 pub const GetExpr = struct {
-    struc: *Expr,
+    target: *Expr,
     name: Token,
 };
 

src/ast_printer.zig

@@ -272,7 +272,7 @@ pub fn printExpr(expr: *const Expr) void {
 
         .Get => |get| {
             warn("(");
-            printExpr(get.struc);
+            printExpr(get.target);
             warn(".{})", get.name.lexeme);
         },
 
@@ -370,7 +370,7 @@ fn prettyType(typ: SymbolUnderlyingType) []const u8 {
 }
 
 pub fn printScope(scope: *Scope, ident: usize) void {
-    print(ident, "scope at addr {}\n", scope);
+    print(ident, "scope at addr {}\n", &scope);
 
     var it = scope.env.iterator();
     while (it.next()) |kv| {
@@ -405,7 +405,7 @@ pub fn printContext(ctx: CompilationContext) void {
 
                 // go through scopes
                 std.debug.warn("scope info:\n");
-                printScope(fn_sym.scope, 0);
+                printScope(fn_sym.scope, 1);
             },
 
             .Struct => |typemap| {

src/codegen.zig

@@ -121,10 +121,9 @@ pub const Codegen = struct {
             },
 
             .Get => |get| {
-                // TODO rename get.struc to get.target
-                var struc = get.struc.*;
+                var target = get.target.*;
 
-                switch (struc) {
+                switch (target) {
                     .Variable => |vari| {
                         // first, we must check if the target is a type
                         // and emit accordingly
@@ -158,7 +157,7 @@ pub const Codegen = struct {
                     },
 
                     else => {
-                        std.debug.warn("Invalid get target: {}\n", ast.ExprType(struc));
+                        std.debug.warn("Invalid get target: {}\n", ast.ExprType(target));
                         return CompileError.EmitError;
                     },
                 }

src/parsers.zig

@@ -320,11 +320,11 @@ pub const Parser = struct {
         return expr;
     }
 
-    fn mkGet(self: *@This(), struc: *Expr, name: Token) !*Expr {
+    fn mkGet(self: *@This(), target: *Expr, name: Token) !*Expr {
         var expr = try self.allocator.create(Expr);
         expr.* = Expr{
             .Get = ast.GetExpr{
-                .struc = struc,
+                .target = target,
                 .name = name,
             },
         };
@@ -906,11 +906,11 @@ pub const Parser = struct {
                         return self.doError("can not initialize struct field");
                     },
 
-                    .Equal => return try self.mkSet(get.struc, get.name, value),
+                    .Equal => return try self.mkSet(get.target, get.name, value),
 
                     .PlusEqual, .MinusEqual, .StarEqual, .SlashEqual => {
                         return try self.mkSet(
-                            get.struc,
+                            get.target,
                             get.name,
                             try self.mkBinary(expr, binop.?, value),
                         );

src/types.zig

@@ -159,9 +159,43 @@ pub const TypeSolver = struct {
                 return func_sym.return_type;
             },
 
-            // TODO variable resolution
+            // TODO analysis for .Variable
 
-            // TODO Get (for structs and enums)
+            .Get => |get| {
+                var target = get.target.*;
+                if (ast.ExprType(target) != .Variable) {
+                    std.debug.warn("Expected Variable as get target, got {}\n", ast.ExprType(target));
+                    return CompileError.TypeError;
+                }
+
+                const lexeme = target.Variable.lexeme;
+                var global_typ_opt = self.resolveGlobalType(ctx, lexeme);
+
+                // TODO:
+                //  - name resolution for when global_typ is null + analysis of
+                //     the name's type
+                //  - analysis for structs
+
+                if (global_typ_opt == null) @panic("TODO name resolution");
+
+                var global_typ = global_typ_opt.?;
+
+                switch (global_typ) {
+
+                    // TODO we need to fetch the given
+                    // struct field (on get.name) type and return it
+                    .Struct => @panic("TODO analysis of struct"),
+                    .Enum => return global_typ,
+                    else => {
+                        std.debug.warn(
+                            "Expected Struct/Enum as get target, got {}\n",
+                            comp.SymbolUnderlyingTypeEnum(global_typ),
+                        );
+
+                        return CompileError.TypeError;
+                    },
+                }
+            },
 
             else => {
                 std.debug.warn("TODO resolve expr {}\n", ast.ExprType(expr.*));