php-parser/visitor/dumper.go
2018-02-20 19:52:07 +02:00

68 lines
1.4 KiB
Go

package visitor
import (
"fmt"
"reflect"
"github.com/z7zmey/php-parser/node"
"github.com/z7zmey/php-parser/position"
"github.com/z7zmey/php-parser/comment"
"github.com/z7zmey/php-parser/walker"
)
func isWalkerImplementsNodeInterface(w walker.Walkable) bool {
switch w.(type) {
case node.Node:
return true
default:
return false
}
}
// Dumper prints ast hierarchy to stdout
// Also prints comments and positions attached to nodes
type Dumper struct {
Indent string
Comments comment.Comments
Positions position.Positions
}
// EnterNode is invoked at every node in heirerchy
func (d Dumper) EnterNode(w walker.Walkable) bool {
if !isWalkerImplementsNodeInterface(w) {
return false
}
n := w.(node.Node)
fmt.Printf("%v%v", d.Indent, reflect.TypeOf(n))
if p := d.Positions[n]; p != nil {
fmt.Printf(" %v", *p)
}
if a := n.Attributes(); len(a) > 0 {
fmt.Printf(" %v", a)
}
fmt.Println()
if c := d.Comments[n]; len(c) > 0 {
fmt.Printf("%vComments:\n", d.Indent+" ")
for _, cc := range c {
fmt.Printf("%v%q\n", d.Indent+" ", cc)
}
}
return true
}
// GetChildrenVisitor is invoked at every node parameter that contains children nodes
func (d Dumper) GetChildrenVisitor(key string) walker.Visitor {
fmt.Printf("%v%q:\n", d.Indent+" ", key)
return Dumper{d.Indent + " ", d.Comments, d.Positions}
}
// LeaveNode is invoked after node process
func (d Dumper) LeaveNode(n walker.Walkable) {
// do nothing
}