json_filter/tree/generate.go

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// Package tree ...
//
// Description : tree ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2023-03-28 18:42
package tree
import (
"fmt"
"strings"
"github.com/pkg/errors"
)
// New 生成一棵JSON树
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:42 2023/3/28
func New(jsonData string) (*Generate, error) {
jsonData = strings.TrimSpace(jsonData)
g := &Generate{
jsonData: jsonData,
jsonDataByte: []byte(jsonData),
}
g.root = NewVirtualNode()
g.currentNode = g.root
err := g.init()
return g, err
}
// Generate ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 22:46 2023/3/28
type Generate struct {
root *Node // 根节点
currentNode *Node // 当前节点
currentParentNode *Node // 当前节点的父节点
jsonData string
jsonDataByte []byte
}
// init 初始化
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:23 2023/3/29
func (g *Generate) init() error {
startIndex := 0
var (
jsonKey string
err error
valueType string
jsonValue string
)
// 获取类型
if valueType, startIndex, err = g.getValueType(startIndex); nil != err {
return err
}
g.root.ValueType = valueType
g.currentNode.ValueType = valueType
for {
if startIndex >= len(g.jsonDataByte) {
break
}
// 获取字段
if jsonKey, startIndex, err = g.getKey(startIndex); nil != err {
return err
}
// 获取类型
if valueType, startIndex, err = g.getValueType(startIndex); nil != err {
return err
}
// 获取值
if jsonValue, startIndex, err = g.getValue(startIndex); nil != err {
return err
}
fmt.Println(jsonKey, valueType, jsonValue, startIndex)
// 创建节点, 并挂在到树上
var newNode *Node
if g.currentNode.ValueType == ValueTypeArray || g.currentNode.ValueType == ValueTypeMap {
newNode = NewNode(jsonKey, jsonValue, valueType, g.currentNode)
g.currentParentNode = g.currentNode
g.currentParentNode.SonNodeList = append(g.currentParentNode.SonNodeList, newNode)
} else {
newNode = NewNode(jsonKey, jsonValue, valueType, g.currentParentNode)
}
g.currentNode = newNode
}
return nil
}
// getKey 获取jsonKey TODO : 转义符识别
//
// Author : zhangdeman001@ke.com<张德满>
//
// Date : 11:36 2023/3/29
func (g *Generate) getKey(startIndex int) (string, int, error) {
keyCharList := []string{}
hasStart := false
for startIndex < len(g.jsonDataByte) {
charStr := string(g.jsonDataByte[startIndex])
if charStr == KeywordSpace {
// 跳过空格
startIndex++
continue
}
if charStr == KeywordDoubleQuote && !hasStart {
// 第一次遇见双引号
startIndex++
hasStart = true
continue
}
if charStr == KeywordDoubleQuote && hasStart {
// 第二次遇见双引号key探寻结束
startIndex++
break
}
if !hasStart {
if charStr == KeywordDoubleQuote || charStr == KeywordObjectStart || charStr == KeywordArrayStart || charStr == KeywordComma {
startIndex++
continue
}
return "", startIndex, errors.New("parse key : format is invalid")
}
if charStr == KeywordEscapeSymbol {
// 转义符
startIndex++
if startIndex >= len(g.jsonDataByte) {
// 转义符后面没东西了
return "", startIndex, errors.New("escape symbol without any data")
}
charStr = string(g.jsonDataByte[startIndex])
}
keyCharList = append(keyCharList, charStr)
startIndex++
}
jsonKey := strings.Join(keyCharList, "")
return jsonKey, startIndex, nil
}
// getValueType 获取数据类型
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:37 2023/3/29
func (g *Generate) getValueType(startIndex int) (string, int, error) {
if startIndex == 0 {
// 初始对象特殊处理
if string(g.jsonDataByte[0]) == KeywordArrayStart {
return ValueTypeArray, 1, nil
}
// 初始对象特殊处理
if string(g.jsonDataByte[0]) == KeywordObjectStart {
return ValueTypeMap, 1, nil
}
return "", 0, errors.New("root data parse : value is invalid")
}
// 指针向后, 探寻到冒号之后第一个非空格字符串
hasFindColon := false
for startIndex < len(g.jsonDataByte) {
charStr := string(g.jsonDataByte[startIndex])
if !hasFindColon {
if charStr == KeywordSpace {
// 跳过空格
startIndex++
continue
}
if charStr != KeywordSpace {
// 非空格
if charStr != KeywordColon {
return "", startIndex, errors.New("value is invalid")
}
startIndex++
hasFindColon = true
break
}
}
}
if !hasFindColon {
return "", startIndex, errors.New("check json value type : value is invalid")
}
keyValType := ""
// 冒号后面探寻值的类型
for startIndex < len(g.jsonDataByte) {
charStr := string(g.jsonDataByte[startIndex])
if charStr == KeywordSpace {
// 跳过空格
startIndex++
continue
}
// 非空
switch charStr {
case KeywordMinus:
fallthrough
case KeywordOne:
fallthrough
case KeywordTwo:
fallthrough
case KeywordThree:
fallthrough
case KeywordFour:
fallthrough
case KeywordFive:
fallthrough
case KeywordSix:
fallthrough
case KeywordSeven:
fallthrough
case KeywordEight:
fallthrough
case KeywordNine:
keyValType = ValueTypeNumber
case KeywordDoubleQuote:
keyValType = ValueTypeString
case KeywordArrayStart:
keyValType = ValueTypeArray
case KeywordObjectStart:
keyValType = ValueTypeMap
default:
return "", startIndex, errors.New("validate json value type : value type is invalid")
}
break
}
return keyValType, startIndex, nil
}
// getValue 获取JSON值
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:09 2023/3/30
func (g *Generate) getValue(startIndex int) (string, int, error) {
valArr := make([]string, 0)
isStart := false
for startIndex < len(g.jsonDataByte) {
str := string(g.jsonDataByte[startIndex])
if str == KeywordSpace {
startIndex++
continue
}
if !isStart {
if str == KeywordArrayEnd || str == KeywordObjectEnd || str == KeywordComma {
startIndex++
continue
}
}
if isStart {
if str == KeywordDoubleQuote || str == KeywordArrayEnd || str == KeywordObjectEnd || str == KeywordComma {
// 值的拼接已结束
startIndex++
break
}
}
if str == KeywordDoubleQuote {
if isStart {
startIndex++
break
} else {
startIndex++
continue
}
}
isStart = true
if str == KeywordEscapeSymbol {
// 转义符
startIndex++
if startIndex >= len(g.jsonDataByte) {
// 转义符后面没东西了
return "", startIndex, errors.New("escape symbol without any data")
}
str = string(g.jsonDataByte[startIndex])
}
valArr = append(valArr, str)
startIndex++
}
return strings.Join(valArr, ""), startIndex, nil
}
// isObject 整体是否为对象
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 22:51 2023/3/28
func (g *Generate) isObject() bool {
return strings.HasPrefix(g.jsonData, KeywordObjectStart)
}
// isArray 整体是否为数组
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 22:51 2023/3/28
func (g *Generate) isArray() bool {
return strings.HasPrefix(g.jsonData, KeywordArrayStart)
}