basic expression interpreter

ast/ast.go

@@ -16,7 +16,7 @@ type ExprVisitor interface {
 }
 
 type Expr interface {
-	accept(v ExprVisitor) any
+	Accept(v ExprVisitor) any
 }
 
 type BinaryExpr struct {
@@ -25,7 +25,7 @@ type BinaryExpr struct {
 	Right    Expr
 }
 
-func (b *BinaryExpr) accept(v ExprVisitor) any {
+func (b *BinaryExpr) Accept(v ExprVisitor) any {
 	return v.VisitBinaryExpr(b)
 }
 
@@ -33,7 +33,7 @@ type GroupingExpr struct {
 	Expr Expr
 }
 
-func (g *GroupingExpr) accept(v ExprVisitor) any {
+func (g *GroupingExpr) Accept(v ExprVisitor) any {
 	return v.VisitGroupingExpr(g)
 }
 
@@ -41,7 +41,7 @@ type LiteralExpr struct {
 	Value any
 }
 
-func (l *LiteralExpr) accept(v ExprVisitor) any {
+func (l *LiteralExpr) Accept(v ExprVisitor) any {
 	return v.VisitLiteralExpr(l)
 }
 
@@ -50,6 +50,6 @@ type UnaryExpr struct {
 	Right    Expr
 }
 
-func (u *UnaryExpr) accept(v ExprVisitor) any {
+func (u *UnaryExpr) Accept(v ExprVisitor) any {
 	return v.VisitUnaryExpr(u)
 }

ast/astprinter.go

@@ -45,7 +45,7 @@ func (p *Printer) Parenthesize(name string, expressions ...Expr) string {
 	val := "(" + name
 
 	for _, e := range expressions {
-		exprStr, ok := (e.accept(p)).(string)
+		exprStr, ok := (e.Accept(p)).(string)
 		if !ok {
 			panic("badly implemented visitor")
 		}
@@ -58,7 +58,7 @@ func (p *Printer) Parenthesize(name string, expressions ...Expr) string {
 }
 
 func (p *Printer) Print(e Expr) string {
-	str, ok := (e.accept(p)).(string)
+	str, ok := (e.Accept(p)).(string)
 	if !ok {
 		panic("badly implemented visitor")
 	}