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explain.go
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explain.go
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package nbt
import (
"errors"
"fmt"
"io"
)
func Explain(r io.Reader, w io.Writer) error {
e := &explainer{w, pathStack{make([]string, 0, 8)}}
nr := NewReader(r)
for {
err := e.parseStruct(nr, false)
if err == io.EOF {
break
} else if err != nil {
return err
}
}
return nil
}
type explainer struct {
w io.Writer
stack pathStack
}
func (e *explainer) parseStruct(nr *Reader, listStruct bool) error {
structDepth := 0
if listStruct {
structDepth = 1
}
for {
typeId, name, err := nr.ReadTag()
if err != nil {
return err
}
if typeId != TagStructEnd {
e.stack.push(name)
}
e.RecordTag(typeId, name)
switch typeId {
case TagStruct:
e.RecordNoValue()
structDepth++
case TagStructEnd:
e.RecordNoValue()
structDepth--
if structDepth == 0 {
return nil
}
case TagByteArray:
e.RecordValue(nr.ReadBytes())
case TagInt8:
e.RecordValue(nr.ReadInt8())
case TagInt16:
e.RecordValue(nr.ReadInt16())
case TagInt32:
e.RecordValue(nr.ReadInt32())
case TagInt64:
e.RecordValue(nr.ReadInt64())
case TagFloat32:
e.RecordValue(nr.ReadFloat32())
case TagFloat64:
e.RecordValue(nr.ReadFloat64())
case TagString:
e.RecordValue(nr.ReadString())
case TagList:
itemTypeId, length, err := nr.ReadListHeader()
if err != nil {
return err
}
e.RecordList(itemTypeId, length)
switch TypeId(itemTypeId) {
case TagInt8:
list := make([]int, length)
for i := 0; i < length; i++ {
x, err := nr.ReadInt8()
list[i] = x
if err != nil {
return err
}
}
e.RecordValue(list, nil)
case TagFloat32:
list := make([]float32, length)
for i := 0; i < length; i++ {
x, err := nr.ReadFloat32()
list[i] = x
if err != nil {
return err
}
}
e.RecordValue(list, nil)
case TagFloat64:
list := make([]float64, length)
for i := 0; i < length; i++ {
x, err := nr.ReadFloat64()
list[i] = x
if err != nil {
return err
}
}
e.RecordValue(list, nil)
case TagStruct:
e.RecordNoValue()
for i := 0; i < length; i++ {
e.stack.push(fmt.Sprintf("[%d]", i))
err := e.parseStruct(nr, true)
if err != nil {
return err
}
e.stack.pop()
}
default:
return errors.New(fmt.Sprintf("reading lists of typeId %d not supported. length:%d", itemTypeId, length))
}
}
if typeId != TagStruct {
e.stack.pop()
}
}
return nil
}
func (e *explainer) RecordTag(typeId TypeId, name string) {
fmt.Fprintf(e.w, "[%2d %-20s] ", typeId, name)
for i, name := range e.stack.path {
if i != 0 {
fmt.Fprintf(e.w, ".")
}
fmt.Fprintf(e.w, "%s", name)
}
if len(e.stack.path) != 0 {
fmt.Fprintf(e.w, " ")
}
}
func (e *explainer) RecordList(itemTypeId TypeId, length int) {
fmt.Fprintf(e.w, " (%2d, %d) ", itemTypeId, length)
}
func (e *explainer) RecordValue(value interface{}, err error) {
if err != nil {
fmt.Fprintln(e.w, err)
}
fmt.Fprintf(e.w, "'%v'\n", value)
//fmt.Fprintln(e.w)
}
func (e *explainer) RecordNoValue() {
fmt.Fprintln(e.w)
}
type pathStack struct {
path []string
}
func (ps *pathStack) push(name string) {
ps.path = append(ps.path, name)
}
func (ps *pathStack) pop() {
if len(ps.path) != 0 {
ps.path = ps.path[0 : len(ps.path)-1]
}
}