add some checker

checked.ts

@@ -22,6 +22,8 @@ export type CheckedExpr =
     } | {
         exprType: "block";
         body: CheckedExpr[];
+        value: CheckedExpr | null;
+        valueType: CheckedType;
     } | {
         exprType: "call";
         subject: CheckedExpr;

checker.ts

@@ -1,7 +1,15 @@
 import { CheckedExpr, CheckedType } from "./checked.ts";
-import { ParsedExpr } from "./parsed.ts";
+import { ParsedExpr as AnyParsedExpr } from "./parsed.ts";
 import { CompileError, Position } from "./token.ts";
 
+type ParsedExpr<
+    Type extends AnyParsedExpr["exprType"] = AnyParsedExpr["exprType"],
+> =
+    & AnyParsedExpr
+    & {
+        exprType: Type;
+    };
+
 export type SymbolValue = {
     id: number;
     subject: string;
@@ -49,7 +57,7 @@ export class Checker {
         }
     }
 
-    private searchTopLevelFn(statement: ParsedExpr & { exprType: "fn" }) {
+    private searchTopLevelFn(statement: ParsedExpr<"fn">) {
     }
 
     private checkExpr(expr: ParsedExpr): CheckedExpr {
@@ -61,6 +69,7 @@ export class Checker {
             case "id":
                 throw new Error("not implemented");
             case "int":
+                return this.checkInt(expr);
             case "if":
             case "block":
             case "call":
@@ -78,6 +87,15 @@ export class Checker {
         }
     }
 
+    private checkInt(expr: ParsedExpr<"int">): CheckedExpr {
+        return {
+            pos: expr.pos,
+            exprType: "int",
+            value: expr.value,
+            valueType: { pos: expr.pos, typeType: "i16" },
+        };
+    }
+
     private errorExpr(message: string, pos: Position): CheckedExpr {
         this.errors.push({ message, pos });
         return {

parsed.ts

@@ -50,6 +50,7 @@ export type ParsedExpr =
     } | {
         exprType: "block";
         body: ParsedExpr[];
+        value: ParsedExpr | null;
     } | {
         exprType: "call";
         subject: ParsedExpr;

parser.ts

@@ -629,9 +629,16 @@ export class Parser {
         this.step();
         while (this.currentIs("semicolon")) this.step();
         const body: ParsedExpr[] = [];
+        let value: ParsedExpr | null = null;
         while (!this.done() && this.current.tokenType != "rbrace") {
-            body.push(this.parseStatement());
-            while (this.currentIs("semicolon")) this.step();
+            const exprOrStatement = this.parseStatement();
+            if (this.currentIs("semicolon")) {
+                body.push(exprOrStatement);
+                while (this.currentIs("semicolon")) this.step();
+            } else {
+                value = exprOrStatement;
+                break;
+            }
         }
         if (!this.currentIs("rbrace")) {
             return this.errorExpr(
@@ -643,6 +650,7 @@ export class Parser {
             pos,
             exprType: "block",
             body,
+            value,
         };
     }