php8.1: added intersection types support (#29)

pkg/visitor/dumper/dumper.go

@@ -261,6 +261,17 @@ func (v *Dumper) Union(n *ast.Union) {
 	v.print(v.indent, "},\n")
 }
 
+func (v *Dumper) Intersection(n *ast.Intersection) {
+	v.print(0, "&ast.Intersection{\n")
+	v.indent++
+
+	v.dumpPosition(n.Position)
+	v.dumpVertexList("Types", n.Types)
+	v.dumpTokenList("SeparatorTkns", n.SeparatorTkns)
+
+	v.indent--
+	v.print(v.indent, "},\n")
+}
 func (v *Dumper) Attribute(n *ast.Attribute) {
 	v.print(0, "&ast.Attribute{\n")
 	v.indent++

pkg/visitor/formatter/formatter.go

@@ -237,6 +237,12 @@ func (f *formatter) Union(n *ast.Union) {
 	}
 }
 
+func (f *formatter) Intersection(n *ast.Intersection) {
+	if len(n.Types) > 0 {
+		n.SeparatorTkns = f.formatList(n.Types, '&')
+	}
+}
+
 func (f *formatter) Attribute(n *ast.Attribute) {
 	n.Name.Accept(f)
 	n.OpenParenthesisTkn = f.newToken('(', []byte("("))

pkg/visitor/null.go

@@ -50,6 +50,10 @@ func (v *Null) Union(_ *ast.Union) {
 	// do nothing
 }
 
+func (v *Null) Intersection(_ *ast.Intersection) {
+	// do nothing
+}
+
 func (v *Null) Attribute(_ *ast.Attribute) {
 	// do nothing
 }

pkg/visitor/printer/printer.go

@@ -180,6 +180,10 @@ func (p *printer) Union(n *ast.Union) {
 	p.printSeparatedList(n.Types, n.SeparatorTkns, []byte("|"))
 }
 
+func (p *printer) Intersection(n *ast.Intersection) {
+	p.printSeparatedList(n.Types, n.SeparatorTkns, []byte("&"))
+}
+
 func (p *printer) Attribute(n *ast.Attribute) {
 	p.printNode(n.Name)
 	p.printToken(n.OpenParenthesisTkn, p.ifNodeList(n.Args, []byte("(")))

pkg/visitor/printer/printer_php8_1_test.go

@@ -104,3 +104,13 @@ $foo = $closure->__invoke(...);
 // new Foo(...); // not working
 `)
 }
+
+func TestIntersectionTypesSyntaxPHP81(t *testing.T) {
+	tester.NewParserPrintTestSuite(t).UsePHP8().Run(`<?php
+class Test {
+    public A&B $prop;
+}
+
+function test(A&B $a): A&B {}
+`)
+}

pkg/visitor/traverser/traverser.go

@@ -78,6 +78,14 @@ func (t *Traverser) Union(n *ast.Union) {
 	}
 }
 
+func (t *Traverser) Intersection(n *ast.Intersection) {
+	n.Accept(t.v)
+
+	for _, nn := range n.Types {
+		nn.Accept(t)
+	}
+}
+
 func (t *Traverser) Attribute(n *ast.Attribute) {
 	n.Accept(t.v)