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| /**
* Created by Andrew on 2017/7/30 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}，默认i处理object ,数组需要传false
*/
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 diguiguigi----: ', s)
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, [])
arr.push(b)
//处理后面半段
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 + 2, last - 1)
let o = {}
o = myParse(newStr, o)
obj[`${key}`] = o
log('debug newStr : ', newStr)
log('debug o : ', o)
} else if (str !== '{' && str !== '[') {
log(`----enter str parse--------${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[`${k}`] = o[k]
//log('obj: ',obj)
//下一个元素
index = s.indexOf(',')
if (index !== -1) {
s = s.slice(index + 1)
obj = myParse(s, obj)
}
} else if (str === '[') {
log('-----enter array parse-----------')
//"age":[50,20,30]
let key = s.split(':[')[0]
//截取s
key = parsedElement(key)
// 找到最后一个]
const last = findElementEnd(s, index, false)
const newStr = s.slice(index + 2, last - 1)
//
const r = dealWithArray(newStr)
log('final:', r)
//log('debug arr: ',newStr)
//Todo 有bug需要考虑后续字符s.slice(last + 1)
obj[`${key}`] = r
}
return obj
}
const testParser = () => {
const o = {
todo: {
'play': '0/1',
'sports': {
'gua':{
'test':222
}
}
},
//name: 'test',
//todo: 没完成：array单独运行没问题，和obj搭配有bug,需要update
//age: [50,'20',[1,[3,4],[22,33],2] ,[55,66]],
}
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 子类obj : `, obj['todo'])
}
testParser()
|