add rudimentary type analysis for return, if, loop

src/types.zig

@@ -189,21 +189,49 @@ pub const TypeSolver = struct {
             // so it should be implicit into the context.
             .VarDecl => @panic("TODO vardecl"),
 
-            // If create two scopes for each branch of the if
-            .If => @panic("TODO ifstmt"),
-
-            // Loop (creates 1 scope) asserts that the expression
-            // type is a bool
-            .Loop => @panic("TODO loop"),
-
-            // For (creates 1 scope) receives arrays, which we dont have yet
-            .For => @panic("TODO for"),
-
             // Returns dont cause any type system things as they deal with
             // values, however, we must ensure that the expression type
             // matches the function type (must fetch from context, or we could
             // pull a hack with err contexts, lol)
-            .Return => @panic("TODO return"),
+            .Return => |ret| {
+                var ret_stmt_type = try self.resolveExprType(ctx, ret.value);
+                // TODO check if ret_stmt_type == ctx.cur_function.return_type
+            },
+
+            // If create two scopes for each branch of the if
+            .If => |ifstmt| {
+                try self.resolveExprType(ifstmt.condition);
+
+                // TODO assert condition's type is bool
+
+                // TODO bump-dump scope
+                for (ifstmt.then_branch.toSlice()) |then_stmt| {
+                    try self.stmtPass(ctx, &then_stmt);
+                }
+
+                if (ifstmt.else_branch) |else_branch| {
+                    // TODO bump-dump scope
+                    for (else_branch.toSlice()) |else_stmt| {
+                        try self.stmtPass(ctx, &else_stmt);
+                    }
+                }
+            },
+
+            // Loop (creates 1 scope) asserts that the expression
+            // type is a bool
+            .Loop => |loop| {
+                try self.resolveExprType(loop.condition);
+
+                // TODO assert condition's type is bool
+
+                // TODO bump-dump scope
+                for (loop.then_branch.toSlice()) |then_stmt| {
+                    try self.stmtPass(ctx, &then_stmt);
+                }
+            },
+
+            // For (creates 1 scope) receives arrays, which we dont have yet
+            .For => @panic("TODO for"),
 
             else => unreachable,
         }