bc518174
 王天杨
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const util = require('./util')
module.exports = function stringify (value, replacer, space) {
const stack = []
let indent = ''
let propertyList
let replacerFunc
let gap = ''
let quote
if (
replacer != null &&
typeof replacer === 'object' &&
!Array.isArray(replacer)
) {
space = replacer.space
quote = replacer.quote
replacer = replacer.replacer
}
if (typeof replacer === 'function') {
replacerFunc = replacer
} else if (Array.isArray(replacer)) {
propertyList = []
for (const v of replacer) {
let item
if (typeof v === 'string') {
item = v
} else if (
typeof v === 'number' ||
v instanceof String ||
v instanceof Number
) {
item = String(v)
}
if (item !== undefined && propertyList.indexOf(item) < 0) {
propertyList.push(item)
}
}
}
if (space instanceof Number) {
space = Number(space)
} else if (space instanceof String) {
space = String(space)
}
if (typeof space === 'number') {
if (space > 0) {
space = Math.min(10, Math.floor(space))
gap = ' '.substr(0, space)
}
} else if (typeof space === 'string') {
gap = space.substr(0, 10)
}
return serializeProperty('', {'': value})
function serializeProperty (key, holder) {
let value = holder[key]
if (value != null) {
if (typeof value.toJSON5 === 'function') {
value = value.toJSON5(key)
} else if (typeof value.toJSON === 'function') {
value = value.toJSON(key)
}
}
if (replacerFunc) {
value = replacerFunc.call(holder, key, value)
}
if (value instanceof Number) {
value = Number(value)
} else if (value instanceof String) {
value = String(value)
} else if (value instanceof Boolean) {
value = value.valueOf()
}
switch (value) {
case null: return 'null'
case true: return 'true'
case false: return 'false'
}
if (typeof value === 'string') {
return quoteString(value, false)
}
if (typeof value === 'number') {
return String(value)
}
if (typeof value === 'object') {
return Array.isArray(value) ? serializeArray(value) : serializeObject(value)
}
return undefined
}
function quoteString (value) {
const quotes = {
"'": 0.1,
'"': 0.2,
}
const replacements = {
"'": "\\'",
'"': '\\"',
'\\': '\\\\',
'\b': '\\b',
'\f': '\\f',
'\n': '\\n',
'\r': '\\r',
'\t': '\\t',
'\v': '\\v',
'\0': '\\0',
'\u2028': '\\u2028',
'\u2029': '\\u2029',
}
let product = ''
for (let i = 0; i < value.length; i++) {
const c = value[i]
switch (c) {
case "'":
case '"':
quotes[c]++
product += c
continue
case '\0':
if (util.isDigit(value[i + 1])) {
product += '\\x00'
continue
}
}
if (replacements[c]) {
product += replacements[c]
continue
}
if (c < ' ') {
let hexString = c.charCodeAt(0).toString(16)
product += '\\x' + ('00' + hexString).substring(hexString.length)
continue
}
product += c
}
const quoteChar = quote || Object.keys(quotes).reduce((a, b) => (quotes[a] < quotes[b]) ? a : b)
product = product.replace(new RegExp(quoteChar, 'g'), replacements[quoteChar])
return quoteChar + product + quoteChar
}
function serializeObject (value) {
if (stack.indexOf(value) >= 0) {
throw TypeError('Converting circular structure to JSON5')
}
stack.push(value)
let stepback = indent
indent = indent + gap
let keys = propertyList || Object.keys(value)
let partial = []
for (const key of keys) {
const propertyString = serializeProperty(key, value)
if (propertyString !== undefined) {
let member = serializeKey(key) + ':'
if (gap !== '') {
member += ' '
}
member += propertyString
partial.push(member)
}
}
let final
if (partial.length === 0) {
final = '{}'
} else {
let properties
if (gap === '') {
properties = partial.join(',')
final = '{' + properties + '}'
} else {
let separator = ',\n' + indent
properties = partial.join(separator)
final = '{\n' + indent + properties + ',\n' + stepback + '}'
}
}
stack.pop()
indent = stepback
return final
}
function serializeKey (key) {
if (key.length === 0) {
return quoteString(key, true)
}
const firstChar = String.fromCodePoint(key.codePointAt(0))
if (!util.isIdStartChar(firstChar)) {
return quoteString(key, true)
}
for (let i = firstChar.length; i < key.length; i++) {
if (!util.isIdContinueChar(String.fromCodePoint(key.codePointAt(i)))) {
return quoteString(key, true)
}
}
return key
}
function serializeArray (value) {
if (stack.indexOf(value) >= 0) {
throw TypeError('Converting circular structure to JSON5')
}
stack.push(value)
let stepback = indent
indent = indent + gap
let partial = []
for (let i = 0; i < value.length; i++) {
const propertyString = serializeProperty(String(i), value)
partial.push((propertyString !== undefined) ? propertyString : 'null')
}
let final
if (partial.length === 0) {
final = '[]'
} else {
if (gap === '') {
let properties = partial.join(',')
final = '[' + properties + ']'
} else {
let separator = ',\n' + indent
let properties = partial.join(separator)
final = '[\n' + indent + properties + ',\n' + stepback + ']'
}
}
stack.pop()
indent = stepback
return final
}
}
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