php-parser/visitor/dumper.go

83 lines
2.1 KiB
Go

// Package visitor contains walker.visitor implementations
package visitor
import (
"fmt"
"io"
"reflect"
"strings"
"github.com/z7zmey/php-parser/node"
"github.com/z7zmey/php-parser/walker"
)
// Dumper writes ast hierarchy to an io.Writer
// Also prints comments and positions attached to nodes
type Dumper struct {
Writer io.Writer
Indent string
NsResolver *NamespaceResolver
}
// EnterNode is invoked at every node in hierarchy
func (d *Dumper) EnterNode(w walker.Walkable) bool {
n := w.(node.Node)
fmt.Fprintf(d.Writer, "%v[%v]\n", d.Indent, reflect.TypeOf(n))
if n.GetPosition() != nil {
fmt.Fprintf(d.Writer, "%v\"Position\": %s\n", d.Indent+" ", n.GetPosition())
}
if d.NsResolver != nil {
if namespacedName, ok := d.NsResolver.ResolvedNames[n]; ok {
fmt.Fprintf(d.Writer, "%v\"NamespacedName\": %q\n", d.Indent+" ", namespacedName)
}
}
if mm := n.GetMeta(); len(*mm) > 0 {
fmt.Fprintf(d.Writer, "%v\"Meta\":\n", d.Indent+" ")
for _, m := range *mm {
fmt.Fprintf(d.Writer, "%v%q before %q\n", d.Indent+" ", m, m.TokenName.String())
}
}
if a := n.Attributes(); len(a) > 0 {
for key, attr := range a {
switch attr.(type) {
case string:
fmt.Fprintf(d.Writer, "%v\"%v\": %q\n", d.Indent+" ", key, attr)
default:
fmt.Fprintf(d.Writer, "%v\"%v\": %v\n", d.Indent+" ", key, attr)
}
}
}
return true
}
// LeaveNode is invoked after node process
func (d *Dumper) LeaveNode(n walker.Walkable) {
// do nothing
}
// GetChildrenVisitor is invoked at every node parameter that contains children nodes
func (d *Dumper) EnterChildNode(key string, w walker.Walkable) {
fmt.Fprintf(d.Writer, "%v%q:\n", d.Indent+" ", key)
d.Indent = d.Indent + " "
}
func (d *Dumper) LeaveChildNode(key string, w walker.Walkable) {
d.Indent = strings.TrimSuffix(d.Indent, " ")
}
func (d *Dumper) EnterChildList(key string, w walker.Walkable) {
fmt.Fprintf(d.Writer, "%v%q:\n", d.Indent+" ", key)
d.Indent = d.Indent + " "
}
func (d *Dumper) LeaveChildList(key string, w walker.Walkable) {
d.Indent = strings.TrimSuffix(d.Indent, " ")
}