php-parser/visitor/pretty_json_dumper.go

// Package visitor contains walker.visitor implementations
package visitor

import (
	"fmt"
	"io"
	"reflect"

	"github.com/z7zmey/php-parser/node"
	"github.com/z7zmey/php-parser/parser"

	"github.com/z7zmey/php-parser/walker"
)

type PrettyJsonDumper struct {
	Writer      io.Writer
	Comments    parser.Comments
	Positions   parser.Positions
	NsResolver  *NamespaceResolver
	depth       int
	isChildNode bool
}

func (d *PrettyJsonDumper) printIndent(w io.Writer) {
	for i := 0; i < d.depth; i++ {
		fmt.Fprint(d.Writer, "  ")
	}
}

// EnterNode is invoked at every node in hierarchy
func (d *PrettyJsonDumper) EnterNode(w walker.Walkable) bool {
	n := w.(node.Node)

	nodeType := reflect.TypeOf(n).String()

	if d.isChildNode {
		d.isChildNode = false
	} else {
		d.printIndent(d.Writer)
	}

	fmt.Fprint(d.Writer, "{\n")
	d.depth++
	d.printIndent(d.Writer)
	fmt.Fprintf(d.Writer, "%q: %q", "type", nodeType)

	if d.Positions != nil {
		if p := d.Positions[n]; p != nil {
			fmt.Fprint(d.Writer, ",\n")
			d.printIndent(d.Writer)
			fmt.Fprintf(d.Writer, "%q: {\n", "position")
			d.depth++
			d.printIndent(d.Writer)
			fmt.Fprintf(d.Writer, "%q: %d,\n", "startPos", p.StartPos)
			d.printIndent(d.Writer)
			fmt.Fprintf(d.Writer, "%q: %d,\n", "endPos", p.EndPos)
			d.printIndent(d.Writer)
			fmt.Fprintf(d.Writer, "%q: %d,\n", "startLine", p.StartLine)
			d.printIndent(d.Writer)
			fmt.Fprintf(d.Writer, "%q: %d\n", "endLine", p.EndLine)
			d.depth--
			d.printIndent(d.Writer)
			fmt.Fprint(d.Writer, "}")
		}
	}

	if d.NsResolver != nil {
		if namespacedName, ok := d.NsResolver.ResolvedNames[n]; ok {
			fmt.Fprint(d.Writer, ",\n")
			d.printIndent(d.Writer)
			fmt.Fprintf(d.Writer, "\"namespacedName\": %q", namespacedName)
		}
	}

	if d.Comments != nil {
		if c := d.Comments[n]; len(c) > 0 {
			fmt.Fprint(d.Writer, ",\n")
			d.printIndent(d.Writer)
			fmt.Fprint(d.Writer, "\"comments\": [\n")
			d.depth++
			for k, cc := range c {
				if k == 0 {
					d.printIndent(d.Writer)
					fmt.Fprintf(d.Writer, "%q", cc)
				} else {
					fmt.Fprint(d.Writer, ",\n")
					d.printIndent(d.Writer)
					fmt.Fprintf(d.Writer, "%q", cc)
				}
			}
			d.depth--
			fmt.Fprint(d.Writer, "\n")
			d.printIndent(d.Writer)
			fmt.Fprint(d.Writer, "]")
		}
	}

	if a := n.Attributes(); len(a) > 0 {
		for key, attr := range a {
			fmt.Fprint(d.Writer, ",\n")
			d.printIndent(d.Writer)
			switch attr.(type) {
			case string:
				fmt.Fprintf(d.Writer, "\"%s\": %q", key, attr)
			default:
				fmt.Fprintf(d.Writer, "\"%s\": %v", key, attr)
			}
		}
	}

	return true
}

// LeaveNode is invoked after node process
func (d *PrettyJsonDumper) LeaveNode(n walker.Walkable) {
	d.depth--
	fmt.Fprint(d.Writer, "\n")
	d.printIndent(d.Writer)
	fmt.Fprint(d.Writer, "}")
}

func (d *PrettyJsonDumper) EnterChildNode(key string, w walker.Walkable) {
	fmt.Fprint(d.Writer, ",\n")
	d.printIndent(d.Writer)
	fmt.Fprintf(d.Writer, "%q: ", key)
	d.isChildNode = true
}

func (d *PrettyJsonDumper) LeaveChildNode(key string, w walker.Walkable) {
	// do nothing
}

func (d *PrettyJsonDumper) EnterChildList(key string, w walker.Walkable) {
	fmt.Fprint(d.Writer, ",\n")
	d.printIndent(d.Writer)
	fmt.Fprintf(d.Writer, "%q: [\n", key)
	d.depth++
}

func (d *PrettyJsonDumper) LeaveChildList(key string, w walker.Walkable) {
	d.depth--
	fmt.Fprint(d.Writer, "\n")
	d.printIndent(d.Writer)
	fmt.Fprint(d.Writer, "]")
}