refactoring: update traverser

cmd/php-parser/main.go

@@ -3,6 +3,10 @@ package main
 import (
 	"bytes"
 	"flag"
+	"github.com/z7zmey/php-parser/pkg/visitor/dumper"
+	"github.com/z7zmey/php-parser/pkg/visitor/nsresolver"
+	"github.com/z7zmey/php-parser/pkg/visitor/printer"
+	"github.com/z7zmey/php-parser/pkg/visitor/traverser"
 	"io"
 	"io/ioutil"
 	"log"
@@ -17,8 +21,6 @@ import (
 	"github.com/yookoala/realpath"
 
 	"github.com/z7zmey/php-parser/pkg/ast"
-	"github.com/z7zmey/php-parser/pkg/ast/traverser"
-	"github.com/z7zmey/php-parser/pkg/ast/visitor"
 	"github.com/z7zmey/php-parser/pkg/errors"
 	"github.com/z7zmey/php-parser/pkg/parser"
 )
@@ -165,7 +167,7 @@ func printerWorker(r <-chan result) {
 
 		if *printBack {
 			o := bytes.NewBuffer([]byte{})
-			p := visitor.NewPrinter(o)
+			p := printer.NewPrinter(o)
 			res.rootNode.Accept(p)
 
 			err := ioutil.WriteFile(res.path, o.Bytes(), 0644)
@@ -173,16 +175,15 @@ func printerWorker(r <-chan result) {
 		}
 
 		if *showResolvedNs {
-			v := visitor.NewNamespaceResolver()
-			t := traverser.NewDFS(v)
-			t.Traverse(res.rootNode)
+			v := nsresolver.NewNamespaceResolver()
+			traverser.NewTraverser(v).Traverse(res.rootNode)
 			for _, n := range v.ResolvedNames {
 				_, _ = io.WriteString(os.Stderr, "===> "+n+"\n")
 			}
 		}
 
 		if *dump == true {
-			visitor.NewDumper(os.Stdout).WithPositions().WithTokens().Dump(res.rootNode)
+			dumper.NewDumper(os.Stdout).WithPositions().WithTokens().Dump(res.rootNode)
 		}
 
 		wg.Done()

pkg/ast/ast.go

@@ -3,23 +3,11 @@ package ast
 import "github.com/z7zmey/php-parser/pkg/position"
 
 type Vertex interface {
-	Accept(v NodeVisitor)
+	Accept(v Visitor)
 	GetPosition() *position.Position
 }
 
-type Traverser interface {
-	Traverse(n Vertex)
-}
-
 type Visitor interface {
-	Enter(key string, singleNode bool)
-	Leave(key string, singleNode bool)
-
-	EnterNode(n Vertex) bool
-	LeaveNode(n Vertex)
-}
-
-type NodeVisitor interface {
 	Root(n *Root)
 	Nullable(n *Nullable)
 	Parameter(n *Parameter)

pkg/visitor/dumper/dumper.go

@@ -1,4 +1,4 @@
-package visitor
+package dumper
 
 import (
 	"github.com/z7zmey/php-parser/pkg/position"

pkg/visitor/dumper/dumper_test.go

@@ -1,19 +1,19 @@
-package visitor_test
+package dumper_test
 
 import (
 	"bytes"
 	"github.com/z7zmey/php-parser/pkg/position"
 	"github.com/z7zmey/php-parser/pkg/token"
+	"github.com/z7zmey/php-parser/pkg/visitor/dumper"
 	"testing"
 
 	"github.com/z7zmey/php-parser/pkg/ast"
-	"github.com/z7zmey/php-parser/pkg/ast/visitor"
 )
 
 func TestDumper_root(t *testing.T) {
 	o := bytes.NewBufferString("")
 
-	p := visitor.NewDumper(o).WithTokens().WithPositions()
+	p := dumper.NewDumper(o).WithTokens().WithPositions()
 	n := &ast.Root{
 		Position: &position.Position{
 			StartLine: 1,

pkg/visitor/formatter/formatter.go

@@ -1,4 +1,4 @@
-package visitor
+package formatter
 
 import (
 	"bytes"

pkg/visitor/nsresolver/namespace_resolver.go

@@ -1,15 +1,16 @@
 // Package visitor contains walker.visitor implementations
-package visitor
+package nsresolver
 
 import (
 	"errors"
 	"github.com/z7zmey/php-parser/pkg/ast"
+	"github.com/z7zmey/php-parser/pkg/visitor"
 	"strings"
 )
 
 // NamespaceResolver visitor
 type NamespaceResolver struct {
-	Null
+	visitor.Null
 	Namespace     *Namespace
 	ResolvedNames map[ast.Vertex]string
 

pkg/visitor/nsresolver/namespace_resolver_test.go

@@ -1,13 +1,13 @@
-package visitor_test
+package nsresolver_test
 
 import (
+	"github.com/z7zmey/php-parser/pkg/visitor/nsresolver"
+	"github.com/z7zmey/php-parser/pkg/visitor/traverser"
 	"testing"
 
 	"gotest.tools/assert"
 
 	"github.com/z7zmey/php-parser/pkg/ast"
-	"github.com/z7zmey/php-parser/pkg/ast/traverser"
-	"github.com/z7zmey/php-parser/pkg/ast/visitor"
 )
 
 func TestResolveStaticCall(t *testing.T) {
@@ -34,9 +34,8 @@ func TestResolveStaticCall(t *testing.T) {
 		nameBC: "A\\B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -65,9 +64,8 @@ func TestResolveStaticPropertyFetch(t *testing.T) {
 		nameBC: "A\\B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -96,9 +94,8 @@ func TestResolveClassConstFetch(t *testing.T) {
 		nameBC: "A\\B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -126,9 +123,8 @@ func TestResolveNew(t *testing.T) {
 		nameBC: "A\\B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -157,9 +153,8 @@ func TestResolveInstanceOf(t *testing.T) {
 		nameBC: "A\\B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -205,9 +200,8 @@ func TestResolveInstanceCatch(t *testing.T) {
 		nameF:  "D\\E",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -236,9 +230,8 @@ func TestResolveFunctionCall(t *testing.T) {
 		nameB: "A\\B",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -267,9 +260,8 @@ func TestResolveConstFetch(t *testing.T) {
 		nameB: "A\\B",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -323,9 +315,8 @@ func TestResolveGroupUse(t *testing.T) {
 		nameE: "B\\D\\E",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -384,9 +375,8 @@ func TestResolveTraitUse(t *testing.T) {
 		relativeNameBC:       "B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -415,9 +405,8 @@ func TestResolveClassName(t *testing.T) {
 		nameBC: "B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -446,9 +435,8 @@ func TestResolveInterfaceName(t *testing.T) {
 		nameBC:        "B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -469,9 +457,8 @@ func TestResolveTraitName(t *testing.T) {
 		traitNode: "A",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -504,9 +491,8 @@ func TestResolveFunctionName(t *testing.T) {
 		nameBC:       "B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -534,9 +520,8 @@ func TestResolveMethodName(t *testing.T) {
 		nameBC: "B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(methodNode)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(methodNode)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -561,9 +546,8 @@ func TestResolveClosureName(t *testing.T) {
 		nameBC: "B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(closureNode)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(closureNode)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -599,9 +583,8 @@ func TestResolveConstantsName(t *testing.T) {
 		constantC: "A\\B\\C",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -673,9 +656,8 @@ func TestResolveNamespaces(t *testing.T) {
 		nameCF:         "A\\C\\F",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -692,9 +674,8 @@ func TestResolveStaticCallDinamicClassName(t *testing.T) {
 
 	expected := map[ast.Vertex]string{}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -749,9 +730,8 @@ func TestDoNotResolveReservedConstants(t *testing.T) {
 		constantNull:  "null",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -872,9 +852,8 @@ func TestDoNotResolveReservedNames(t *testing.T) {
 		nameObject:   "object",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -943,9 +922,8 @@ func TestDoNotResolveReservedSpecialNames(t *testing.T) {
 		nameParent: "parent",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stxTree)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stxTree)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }
@@ -995,9 +973,8 @@ func TestResolvePropertyTypeName(t *testing.T) {
 		classNode:          "Foo\\Bar",
 	}
 
-	nsResolver := visitor.NewNamespaceResolver()
-	dfsTraverser := traverser.NewDFS(nsResolver)
-	dfsTraverser.Traverse(stmts)
+	nsResolver := nsresolver.NewNamespaceResolver()
+	traverser.NewTraverser(nsResolver).Traverse(stmts)
 
 	assert.DeepEqual(t, expected, nsResolver.ResolvedNames)
 }

pkg/visitor/printer/printer.go

@@ -1,4 +1,4 @@
-package visitor
+package printer
 
 import (
 	"bytes"

pkg/visitor/printer/printer_php5_test.go

@@ -1,8 +1,8 @@
-package visitor_test
+package printer_test
 
 import (
 	"bytes"
-	"github.com/z7zmey/php-parser/pkg/ast/visitor"
+	printer2 "github.com/z7zmey/php-parser/pkg/visitor/printer"
 	"testing"
 
 	"github.com/z7zmey/php-parser/pkg/ast"
@@ -22,7 +22,7 @@ func parsePhp5(src string) ast.Vertex {
 func printPhp5(n ast.Vertex) string {
 	o := bytes.NewBufferString("")
 
-	printer := visitor.NewPrinter(o)
+	printer := printer2.NewPrinter(o)
 	n.Accept(printer)
 
 	return o.String()

pkg/visitor/printer/printer_php7_test.go

@@ -1,14 +1,14 @@
-package visitor_test
+package printer_test
 
 import (
 	"bytes"
+	printer2 "github.com/z7zmey/php-parser/pkg/visitor/printer"
 	"os"
 	"testing"
 
 	"github.com/z7zmey/php-parser/internal/php7"
 	"github.com/z7zmey/php-parser/internal/scanner"
 	"github.com/z7zmey/php-parser/pkg/ast"
-	"github.com/z7zmey/php-parser/pkg/ast/visitor"
 )
 
 func ExamplePrinter() {
@@ -41,7 +41,7 @@ abstract class Bar extends Baz
 
 	// print
 
-	printer := visitor.NewPrinter(os.Stdout)
+	printer := printer2.NewPrinter(os.Stdout)
 	rootNode.Accept(printer)
 
 	// Output:
@@ -70,7 +70,7 @@ func parse(src string) ast.Vertex {
 func print(n ast.Vertex) string {
 	o := bytes.NewBufferString("")
 
-	printer := visitor.NewPrinter(o)
+	printer := printer2.NewPrinter(o)
 	n.Accept(printer)
 
 	return o.String()