php8.1: added readonly modifier (#6)

pkg/visitor/dumper/dumper.go

@@ -194,7 +194,7 @@ func (v *Dumper) Parameter(n *ast.Parameter) {
 
 	v.dumpPosition(n.Position)
 	v.dumpVertexList("AttrGroups", n.AttrGroups)
-	v.dumpVertex("Visibility", n.Visibility)
+	v.dumpVertexList("Modifiers", n.Modifiers)
 	v.dumpVertex("Type", n.Type)
 	v.dumpToken("AmpersandTkn", n.AmpersandTkn)
 	v.dumpToken("VariadicTkn", n.VariadicTkn)

pkg/visitor/formatter/formatter.go

@@ -161,8 +161,8 @@ func (f *formatter) Parameter(n *ast.Parameter) {
 		f.addFreeFloating(token.T_WHITESPACE, []byte(" "))
 	}
 
-	if n.Visibility != nil {
-		n.Visibility.Accept(f)
+	for _, modifier := range n.Modifiers {
+		modifier.Accept(f)
 		f.addFreeFloating(token.T_WHITESPACE, []byte(" "))
 	}
 

pkg/visitor/printer/printer.go

@@ -147,7 +147,7 @@ func (p *printer) Nullable(n *ast.Nullable) {
 
 func (p *printer) Parameter(n *ast.Parameter) {
 	p.printList(n.AttrGroups)
-	p.printNode(n.Visibility)
+	p.printList(n.Modifiers)
 	p.printNode(n.Type)
 	p.printToken(n.AmpersandTkn, nil)
 	p.printToken(n.VariadicTkn, nil)

pkg/visitor/printer/printer_php8_1_test.go

@@ -0,0 +1,25 @@
+package printer_test
+
+import (
+	"testing"
+
+	"github.com/VKCOM/php-parser/internal/tester"
+)
+
+func TestParseAndPrintReadonlyModifierPHP81(t *testing.T) {
+	tester.NewParserPrintTestSuite(t).UsePHP8().Run(`<?php
+class Foo {
+	readonly string $a;
+	private readonly string $a;
+	private string $a;
+	private readonly $a = 100;
+
+	public function __construct(
+		readonly string $a,
+		private readonly string $a,
+		private string $a,
+		private readonly $a = 100,
+	) {}
+}
+`)
+}

pkg/visitor/traverser/traverser.go

@@ -41,7 +41,10 @@ func (t *Traverser) Parameter(n *ast.Parameter) {
 		nn.Accept(t)
 	}
 
-	t.Traverse(n.Visibility)
+	for _, nn := range n.Modifiers {
+		nn.Accept(t)
+	}
+
 	t.Traverse(n.Type)
 	t.Traverse(n.Var)
 	t.Traverse(n.DefaultValue)