refactoring: remove ExprReference node

internal/php5/php5.y

@@ -1000,12 +1000,12 @@ unticked_statement:
                     foreach.Var = $6.(*ast.StmtForeach).Var
                 }
 
-                if val, ok := foreach.Key.(*ast.ExprReference); ok {
+                if val, ok := foreach.Key.(*ast.StmtForeach); ok {
                     yylex.(*Parser).errHandlerFunc(errors.NewError("Key element cannot be a reference", val.AmpersandTkn.Position))
                     foreach.Key = val.Var
                 }
 
-                if val, ok := foreach.Var.(*ast.ExprReference); ok {
+                if val, ok := foreach.Var.(*ast.StmtForeach); ok {
                     foreach.AmpersandTkn    = val.AmpersandTkn
                     foreach.Var             = val.Var
                 }
@@ -1030,12 +1030,12 @@ unticked_statement:
                     foreach.Var = $6.(*ast.StmtForeach).Var
                 }
 
-                if val, ok := foreach.Key.(*ast.ExprReference); ok {
+                if val, ok := foreach.Key.(*ast.StmtForeach); ok {
                     yylex.(*Parser).errHandlerFunc(errors.NewError("Key element cannot be a reference", val.AmpersandTkn.Position))
                     foreach.Key = val.Var
                 }
 
-                if val, ok := foreach.Var.(*ast.ExprReference); ok {
+                if val, ok := foreach.Var.(*ast.StmtForeach); ok {
                     foreach.AmpersandTkn    = val.AmpersandTkn
                     foreach.Var             = val.Var
                 }
@@ -1462,7 +1462,7 @@ foreach_variable:
             }
     |   '&' variable
             {
-                $$ = &ast.ExprReference{
+                $$ = &ast.StmtForeach{
                     Position: yylex.(*Parser).builder.NewTokenNodePosition($1, $2),
                     AmpersandTkn: $1,
                     Var:          $2,

internal/php7/php7.y

@@ -972,7 +972,7 @@ statement:
                 foreach.Var                 = $5
                 foreach.CloseParenthesisTkn = $6
 
-                if val, ok := $5.(*ast.ExprReference); ok {
+                if val, ok := $5.(*ast.StmtForeach); ok {
                     foreach.AmpersandTkn    = val.AmpersandTkn
                     foreach.Var             = val.Var
                 }
@@ -993,7 +993,7 @@ statement:
                 foreach.Var                 = $7
                 foreach.CloseParenthesisTkn = $8
 
-                if val, ok := $7.(*ast.ExprReference); ok {
+                if val, ok := $7.(*ast.StmtForeach); ok {
                     foreach.AmpersandTkn    = val.AmpersandTkn
                     foreach.Var             = val.Var
                 }
@@ -1359,7 +1359,7 @@ foreach_variable:
             }
     |   '&' variable
             {
-                $$ = &ast.ExprReference{
+                $$ = &ast.StmtForeach{
                     Position: yylex.(*Parser).builder.NewTokenNodePosition($1, $2),
                     AmpersandTkn: $1,
                     Var:          $2,

pkg/ast/ast.go

@@ -107,7 +107,6 @@ type NodeVisitor interface {
 	ExprPreInc(n *ExprPreInc)
 	ExprPrint(n *ExprPrint)
 	ExprPropertyFetch(n *ExprPropertyFetch)
-	ExprReference(n *ExprReference)
 	ExprRequire(n *ExprRequire)
 	ExprRequireOnce(n *ExprRequireOnce)
 	ExprShellExec(n *ExprShellExec)

pkg/ast/node.go

@@ -1629,21 +1629,6 @@ func (n *ExprPropertyFetch) GetPosition() *position.Position {
 	return n.Position
 }
 
-// ExprReference node
-type ExprReference struct {
-	Position     *position.Position
-	AmpersandTkn *token.Token
-	Var          Vertex
-}
-
-func (n *ExprReference) Accept(v NodeVisitor) {
-	v.ExprReference(n)
-}
-
-func (n *ExprReference) GetPosition() *position.Position {
-	return n.Position
-}
-
 // ExprRequire node
 type ExprRequire struct {
 	Position   *position.Position

pkg/ast/traverser/dfs.go

@@ -1451,18 +1451,6 @@ func (t *DFS) Traverse(n ast.Vertex) {
 			t.Traverse(nn.Property)
 			t.visitor.Leave("Property", true)
 		}
-	case *ast.ExprReference:
-		if nn == nil {
-			return
-		}
-		if !t.visitor.EnterNode(nn) {
-			return
-		}
-		if nn.Var != nil {
-			t.visitor.Enter("Var", true)
-			t.Traverse(nn.Var)
-			t.visitor.Leave("Var", true)
-		}
 	case *ast.ExprRequire:
 		if nn == nil {
 			return

pkg/ast/visitor/dumper.go

@@ -1425,18 +1425,6 @@ func (v *Dumper) ExprPropertyFetch(n *ast.ExprPropertyFetch) {
 	v.print(v.indent, "},\n")
 }
 
-func (v *Dumper) ExprReference(n *ast.ExprReference) {
-	v.print(0, "&ast.ExprReference{\n")
-	v.indent++
-
-	v.dumpPosition(n.Position)
-	v.dumpToken("AmpersandTkn", n.AmpersandTkn)
-	v.dumpVertex("Var", n.Var)
-
-	v.indent--
-	v.print(v.indent, "},\n")
-}
-
 func (v *Dumper) ExprRequire(n *ast.ExprRequire) {
 	v.print(0, "&ast.ExprRequire{\n")
 	v.indent++

pkg/ast/visitor/formatter.go

@@ -1349,11 +1349,6 @@ func (f *formatter) ExprPropertyFetch(n *ast.ExprPropertyFetch) {
 	n.Property.Accept(f)
 }
 
-func (f *formatter) ExprReference(n *ast.ExprReference) {
-	n.AmpersandTkn = f.newToken('&', []byte("&"))
-	n.Var.Accept(f)
-}
-
 func (f *formatter) ExprRequire(n *ast.ExprRequire) {
 	n.RequireTkn = f.newToken(token.T_REQUIRE, []byte("require"))
 	f.addFreeFloating(token.T_WHITESPACE, []byte(" "))

pkg/ast/visitor/formatter_test.go

@@ -4483,31 +4483,6 @@ func TestFormatter_ExprPropertyFetch(t *testing.T) {
 	}
 }
 
-func TestFormatter_ExprReference(t *testing.T) {
-	o := bytes.NewBufferString("")
-
-	n := &ast.ExprReference{
-		Var: &ast.ExprVariable{
-			VarName: &ast.Identifier{
-				Value: []byte("$foo"),
-			},
-		},
-	}
-
-	f := visitor.NewFormatter().WithState(visitor.FormatterStatePHP).WithIndent(1)
-	n.Accept(f)
-
-	p := visitor.NewPrinter(o).WithState(visitor.PrinterStatePHP)
-	n.Accept(p)
-
-	expected := `&$foo`
-	actual := o.String()
-
-	if expected != actual {
-		t.Errorf("\nexpected: %s\ngot: %s\n", expected, actual)
-	}
-}
-
 func TestFormatter_ExprRequire(t *testing.T) {
 	o := bytes.NewBufferString("")
 

pkg/ast/visitor/null.go

@@ -362,10 +362,6 @@ func (v *Null) ExprPropertyFetch(_ *ast.ExprPropertyFetch) {
 	// do nothing
 }
 
-func (v *Null) ExprReference(_ *ast.ExprReference) {
-	// do nothing
-}
-
 func (v *Null) ExprRequire(_ *ast.ExprRequire) {
 	// do nothing
 }

pkg/ast/visitor/printer.go

@@ -817,11 +817,6 @@ func (p *printer) ExprPropertyFetch(n *ast.ExprPropertyFetch) {
 	p.printNode(n.Property)
 }
 
-func (p *printer) ExprReference(n *ast.ExprReference) {
-	p.printToken(n.AmpersandTkn, []byte("&"))
-	p.printNode(n.Var)
-}
-
 func (p *printer) ExprRequire(n *ast.ExprRequire) {
 	p.printToken(n.RequireTkn, []byte("require"))
 	p.printNode(n.Expr)

pkg/ast/visitor/printer_test.go

@@ -1634,9 +1634,12 @@ func TestPrinterPrintExprArray(t *testing.T) {
 			},
 			&ast.ExprArrayItem{
 				Key: &ast.ScalarLnumber{Value: []byte("2")},
-				Val: &ast.ExprReference{Var: &ast.ExprVariable{
+				AmpersandTkn: &token.Token{
+					Value: []byte("&"),
+				},
+				Val: &ast.ExprVariable{
 					VarName: &ast.Identifier{Value: []byte("$var")},
-				}},
+				},
 			},
 			&ast.ExprArrayItem{
 				Val: &ast.ExprVariable{
@@ -2323,25 +2326,6 @@ func TestPrinterPrintPropertyFetch(t *testing.T) {
 	}
 }
 
-func TestPrinterPrintExprReference(t *testing.T) {
-	o := bytes.NewBufferString("")
-
-	p := visitor.NewPrinter(o).WithState(visitor.PrinterStatePHP)
-	n := &ast.ExprReference{
-		Var: &ast.ExprVariable{
-			VarName: &ast.Identifier{Value: []byte("$foo")},
-		},
-	}
-	n.Accept(p)
-
-	expected := `&$foo`
-	actual := o.String()
-
-	if expected != actual {
-		t.Errorf("\nexpected: %s\ngot: %s\n", expected, actual)
-	}
-}
-
 func TestPrinterPrintRequire(t *testing.T) {
 	o := bytes.NewBufferString("")
 
@@ -2413,9 +2397,12 @@ func TestPrinterPrintExprShortArray(t *testing.T) {
 			},
 			&ast.ExprArrayItem{
 				Key: &ast.ScalarLnumber{Value: []byte("2")},
-				Val: &ast.ExprReference{Var: &ast.ExprVariable{
+				AmpersandTkn: &token.Token{
+					Value: []byte("&"),
+				},
+				Val: &ast.ExprVariable{
 					VarName: &ast.Identifier{Value: []byte("$var")},
-				}},
+				},
 			},
 			&ast.ExprArrayItem{
 				Val: &ast.ExprVariable{
@@ -2848,10 +2835,46 @@ func TestPrinterPrintAltForeach(t *testing.T) {
 		Key: &ast.ExprVariable{
 			VarName: &ast.Identifier{Value: []byte("$key")},
 		},
-		Var: &ast.ExprReference{
 		Var: &ast.ExprVariable{
 			VarName: &ast.Identifier{Value: []byte("$val")},
 		},
+		ColonTkn: &token.Token{
+			Value: []byte(":"),
+		},
+		Stmt: &ast.StmtStmtList{
+			Stmts: []ast.Vertex{
+				&ast.StmtExpression{Expr: &ast.ExprVariable{
+					VarName: &ast.Identifier{Value: []byte("$d")},
+				}},
+			},
+		},
+	}
+	n.Accept(p)
+
+	expected := `foreach($var as$key=>$val):$d;endforeach;`
+	actual := o.String()
+
+	if expected != actual {
+		t.Errorf("\nexpected: %s\ngot: %s\n", expected, actual)
+	}
+}
+
+func TestPrinterPrintAltForeach_Reference(t *testing.T) {
+	o := bytes.NewBufferString("")
+
+	p := visitor.NewPrinter(o).WithState(visitor.PrinterStatePHP)
+	n := &ast.StmtForeach{
+		Expr: &ast.ExprVariable{
+			VarName: &ast.Identifier{Value: []byte("$var")},
+		},
+		Key: &ast.ExprVariable{
+			VarName: &ast.Identifier{Value: []byte("$key")},
+		},
+		AmpersandTkn: &token.Token{
+			Value: []byte("&"),
+		},
+		Var: &ast.ExprVariable{
+			VarName: &ast.Identifier{Value: []byte("$val")},
 		},
 		ColonTkn: &token.Token{
 			Value: []byte(":"),