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xmlReader.go
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xmlReader.go
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/*
* Copyright (c) 2021 BlueStorm
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// Package XmlReader xml fast parser
//
package XmlReader
import (
"bytes"
"github.com/BlueStorm001/bufferPool"
)
type XReader struct {
bufferPool *bufferPool.BufferPool
bufferMax int //最大缓冲字节数
}
type XDecoder struct {
bus *bufferPool.ByteBuffer //原始记录
len int //bus长度
index int //Read位置
isc bool
b byte //当前Read byte
//buffer bytes.Buffer //存储的缓冲节点
buffer []byte //存储的缓冲节点
bufferMax int //最大缓冲字节数
bufferIndex int //缓冲位置
reader *XReader
}
type XToken struct {
Name string
Attr map[string]string
Data string
StartElement bool
EndElement bool
IsText bool
Finish bool
}
// New 可在全局声明XReader
// max1:buffer池数量,给予最大并发量数值,默认500。
// max2:xml节点最大长度,默认500。例如:<root id="a"> 长度是13。
func New(max ...int) *XReader {
var m1 = 500
if len(max) > 0 {
m1 = max[0]
}
var m2 = 500
if len(max) > 1 {
m2 = max[1]
}
return &XReader{
bufferPool: bufferPool.New(m1),
bufferMax: m2,
}
}
// Load 载入xml文档
func (r *XReader) Load(input []byte) *XDecoder {
d := &XDecoder{}
d.bus = r.bufferPool.Get()
d.bus.Write(input)
d.len = d.bus.Len()
d.index = 0
d.bufferMax = r.bufferMax
d.buffer = make([]byte, d.bufferMax)
d.bufferIndex = -1
d.reader = r
return d
}
func NewDefault(input string) *XDecoder {
return Create(input, 500)
}
func Create(input string, bufferMax int) *XDecoder {
return CreateBytes([]byte(input), bufferMax)
}
var byteBuffer = bufferPool.NewDefault()
func CreateBytes(input []byte, bufferMax int) *XDecoder {
d := &XDecoder{}
d.bus = byteBuffer.Get()
d.bus.Write(input)
d.len = d.bus.Len()
d.index = 0
d.bufferMax = bufferMax
d.buffer = make([]byte, d.bufferMax)
d.bufferIndex = -1
return d
}
// Text 获取文本
func (d *XDecoder) Text() string {
var b bytes.Buffer
for i := d.index; i < d.len; i++ {
if d.pred(i-1) == '/' && d.pred(i) == '>' {
return ""
}
if d.pred(i) == '<' && d.pred(i+1) == '/' {
d.index = i
return b.String()
}
//fmt.Println(d.pred(i-1), d.pred(i), d.pred(i+1), d.pred(i+2), d.pred(i+3))
if d.get(i) == '.' {
return ""
}
b.WriteByte(d.b)
if d.pred(i+1) == '<' && d.pred(i+2) == '/' {
d.index = i
return b.String()
}
}
return ""
}
// Read 循环内读取xml
func (d *XDecoder) Read() XToken {
var token = XToken{}
for i := d.index; i < d.len; i++ {
el := d.get(i)
if el == '.' {
return d.complete()
}
//只查找<
if el == '<' {
//获取ElementName
for {
i++
el1 := d.get(i)
if el1 == '.' {
return d.complete()
}
//结束
if el1 == '/' {
for {
i++
el2 := d.get(i)
if el2 == '.' {
return d.complete()
}
if el2 == '_' {
continue
}
if el2 == '@' {
d.append()
} else {
token.Name = d.str()
token.StartElement = false
token.EndElement = true
return d.next(i, token)
}
}
}
if el1 == '@' {
d.append()
} else {
token.Name = d.str()
token.StartElement = true
token.EndElement = false
break
}
}
//结束本次
if d.end() {
return d.next(i, token)
}
//开始获取属性
var k string
for {
i++
e := d.get(i)
if e == '.' {
return d.complete()
}
if e == '_' {
continue
}
if d.end() {
return d.next(i, token)
}
if e == '@' {
d.append()
} else {
if k == "" {
k = d.str()
}
}
//获得了KEY 再获取属性value
if e == '=' && k != "" {
do := 0
//获取属性value
for {
i++
if d.get(i) == '"' {
do++
if do == 1 {
continue
}
}
if do == 1 {
d.append()
} else if do == 2 {
if token.Attr == nil {
token.Attr = make(map[string]string)
}
token.Attr[k] = d.str()
k = ""
break
}
}
}
}
}
}
return d.complete()
}
func (d *XDecoder) pred(i int) byte {
if i >= d.len {
return '.' //结束
}
return match(d.bus.B[i])
}
func (d *XDecoder) get(i int) byte {
if i >= d.len {
return '.' //结束
}
d.b = d.bus.B[i]
return match(d.b)
}
func match(b byte) byte {
switch b {
case 60:
return '<'
case 47:
return '/'
case 62:
return '>'
case 32: // 空格
return '_'
case 39, 34: //单双引
return '"'
case 61:
return '='
default:
return '@'
}
}
func (d *XDecoder) end() bool {
switch d.b {
case '/':
return true
case '>':
return true
}
return false
}
func (d *XDecoder) str() string {
if d.bufferIndex < 0 {
return ""
}
//切片
buffer := d.buffer[0 : d.bufferIndex+1]
//初始化
d.bufferIndex = -1
return string(buffer)
}
func (d *XDecoder) append() {
//d.buffer = append(d.buffer, d.b)
if d.bufferIndex >= d.bufferMax-1 {
return
}
d.bufferIndex++
d.buffer[d.bufferIndex] = d.b
}
func (d *XDecoder) next(i int, token XToken) XToken {
d.index = i + 1
return token
}
func (d *XDecoder) clear() {
if d.reader == nil {
byteBuffer.Put(d.bus)
} else {
d.reader.bufferPool.Put(d.bus)
}
d.len = 0
d.b = 0
d.index = 0
d.isc = false
d.buffer = nil
}
func (d *XDecoder) complete() XToken {
var token = XToken{}
token.Finish = true
d.clear()
return token
}