wrote dsl for ast boiler plate generation

ast/_ast.go

@@ -0,0 +1,55 @@
+package ast
+
+import "git.red-panda.pet/pandaware/lox-go/lexer"
+
+// todo: find something better than any here
+// we can't use generics on either the visitor itself or
+// each individual method because the adding it to the
+// visitor itself infects every expr you use with it
+// and methods cannot have generic parameters
+
+type ExprVisitor interface {
+	VisitBinaryExpr(b *BinaryExpr) any
+	VisitGroupingExpr(g *GroupingExpr) any
+	VisitLiteralExpr(g *LiteralExpr) any
+	VisitUnaryExpr(g *UnaryExpr) any
+}
+
+type Expr interface {
+	Accept(v ExprVisitor) any
+}
+
+type BinaryExpr struct {
+	Left     Expr
+	Operator *lexer.Token
+	Right    Expr
+}
+
+func (b *BinaryExpr) Accept(v ExprVisitor) any {
+	return v.VisitBinaryExpr(b)
+}
+
+type GroupingExpr struct {
+	Expr Expr
+}
+
+func (g *GroupingExpr) Accept(v ExprVisitor) any {
+	return v.VisitGroupingExpr(g)
+}
+
+type LiteralExpr struct {
+	Value any
+}
+
+func (l *LiteralExpr) Accept(v ExprVisitor) any {
+	return v.VisitLiteralExpr(l)
+}
+
+type UnaryExpr struct {
+	Operator *lexer.Token
+	Right    Expr
+}
+
+func (u *UnaryExpr) Accept(v ExprVisitor) any {
+	return v.VisitUnaryExpr(u)
+}