1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
| /**
* Created by Andrew on 2018/6/30 0030.
*/
const log = console.log.bind(console)
//处理key,value,去掉""
const parsedElement = (e) => {
if(e[0] === '\"' || e[0] === "\'") {
return e.slice(1, e.length - 1)
}else {
return Number(e)
}
}
//解析name: 'gua', 一个字符值的情况
const parsedOne = (s) => {
log('debug parsedOne',s)
const obj = {}
const arr = s.split(',')
arr.forEach(e=>{
const t = e.split(":")
const k = parsedElement(t[0])
const v = parsedElement(t[1])
obj[k] = v
})
return obj
}
/**
* [[[[[]]]]]]]
* 处理{{{{}}}},取到最后一个}
*/
const findElementEnd = (str, start ,isObj = true) => {
let a = ''
let b= ''
if(isObj){
a = '{'
b = '}'
}else{
a = '['
b = ']'
}
const stack = [a]
let i = start + 1
while(i < str.length && stack.length > 0) {
if(str[i] === a) {
stack.push(a)
}else if(str[i] === b) {
let index = stack.length - 1
stack.splice(index, 1)
}else {
//
}
i++
}
return i
}
const dealWithArray = (s ,arr=[])=>{
//50,"20",[1,[3,4],2],[55,66]
const index = s.indexOf('[')
log('debug 6666----: ', s ,index)
if( index === -1){
const a = s.split(',').map(e =>parsedElement(e))
arr.push.apply(arr,a)
}else {
//处理前面半段,不能为0
if(index !== 0){
let newStr = s.slice(0,index - 1)
let a = newStr.split(',').map(e =>parsedElement(e))
arr.push.apply(arr,a)
}
//递归(中间)
const last = findElementEnd(s , index , false)
let newS = s.slice(index + 1 ,last - 1)
let temp = []
let b = dealWithArray(newS ,[])
//log('77???---',newS, b)
//if(newS.indexOf('[') === -1 && newS.indexOf(']') === -1){
// arr.push.apply(arr,b)
//}else {
arr.push(b)
// }
//arr.push(b)
//处理后面半段
log('==============================',arr)
log('===============================\n')
//继续递归
let newStr = s.slice(last + 1)
if(newStr.length > 0){
log('test------',newStr)
let c = dealWithArray(newStr ,[])
arr.push.apply(arr ,c)
}
}
return arr
}
const myParse =(s ,obj={})=>{
if(s[0] === '{'){
s = s.slice(1, s.length - 1)
}
//复杂情形
// "name":"gua","todo":{"play":"0/1"}
let index = s.indexOf(':')
const str = s[index + 1]
log('debug digui ',s, '\n')
if(str === '{'){
log('-----enter object parse-----------')
let key = s.split(':{')[0]
//截取s
key = parsedElement(key)
// 找到最后一个}
const last = findElementEnd(s , index)
const newStr = s.slice(index +1 , last)
let o = {}
o = myParse(newStr , o)
obj[`${key}`] = o
log('debug newStr : ',newStr)
log('debug o : ',o)
}else if(str === '['){
log('-----enter array parse-----------')
//"age":[50,20,30]
let key = s.split(':[')[0]
//截取s
key = parsedElement(key)
// 找到最后一个]
const last = findElementEnd(s , index + 1 ,false)
const newStr = s.slice(index + 1 , last)
const r = dealWithArray(newStr)
log('final:', r[0])
log('str: ', s.slice(last + 1))
obj[`${key}`] = r[0]
//继续递归
const l = s.slice(last + 1)
if(l.length > 0){
//截取不为空串就继续
myParse(l,obj)
}
//log('test: ',test)
}else if (str !== '{' && str !== '['){
log(`----enter str parse--------${s} \n`)
//取到"name":"gua"
const cell = s.split(',')[0]
log('cell ',s,'----', cell)
const o = parsedOne(cell)
const k = Object.keys(o)[0]
obj[`${k}`] = o[k]
//log('obj: ',obj)
//下一个元素
index = s.indexOf(',')
if (index !== -1) {
s = s.slice(index + 1)
obj = myParse(s, obj)
}
}
return obj
}
const testParser = () => {
const o = {
age: [50,'20',[1,[3,4],[22,33],2] ,[55,66]],
age3: [50,[77,88]],
todo: {
'play': '0/1',
'sports': {
'gua':{
'test':222
}
}
}
}
const s = JSON.stringify(o)
const obj = myParse(s)
// log('\n\nfinal result : ')
log('\nJSON.parse result:', s)
log(`\nAndrew's JSON Parse : `, obj)
log(`\nAndrew's JSON Parse TODO detail: \n`, obj['todo'])
}
testParser()
|