wrote dsl for ast boiler plate generation

ast/gen/debug.go

@@ -0,0 +1,55 @@
+package main
+
+type debugVisitor struct{}
+
+func debug(node node) string {
+	d := new(debugVisitor)
+	v, _ := node.accept(d)
+	return v
+}
+
+// visitASTDefinitionsNode implements visitor.
+func (d *debugVisitor) visitASTDefinitionsNode(a *astDefinitionsNode) (string, error) {
+	v := "#" + a.name + "\n\n"
+
+	for _, defNode := range a.definitions {
+		def, _ := defNode.accept(d)
+		v += def + "\n\n"
+	}
+
+	return v, nil
+}
+
+// visitDefinition implements visitor.
+func (d *debugVisitor) visitDefinition(def *definitionNode) (string, error) {
+	id, _ := def.identifier.accept(d)
+	v := id + " [\n"
+
+	for _, fNode := range def.fields {
+		field, _ := fNode.accept(d)
+		v += "\t" + field + "\n"
+	}
+
+	v += "]\n\n"
+
+	return v, nil
+}
+
+// visitField implements visitor.
+func (d *debugVisitor) visitField(g *fieldNode) (string, error) {
+	left, _ := g.left.accept(d)
+	right, _ := g.right.accept(d)
+	return left + " = " + right + ";", nil
+}
+
+// visitIdentifier implements visitor.
+func (d *debugVisitor) visitIdentifier(i *identifierNode) (string, error) {
+	return i.value, nil
+}
+
+// visitName implements visitor.
+func (d *debugVisitor) visitName(n *nameNode) (string, error) {
+	return n.value, nil
+}
+
+var _ visitor = new(debugVisitor)