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