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const { hasOwnProperty } = Object.prototype
const eol = typeof process !== 'undefined' &&
process.platform === 'win32' ? '\r\n' : '\n'
const encode = (obj, opt) => {
const children = []
let out = ''
if (typeof opt === 'string') {
opt = {
section: opt,
whitespace: false,
}
} else {
opt = opt || Object.create(null)
opt.whitespace = opt.whitespace === true
}
const separator = opt.whitespace ? ' = ' : '='
for (const k of Object.keys(obj)) {
const val = obj[k]
if (val && Array.isArray(val)) {
for (const item of val)
out += safe(k + '[]') + separator + safe(item) + '\n'
} else if (val && typeof val === 'object')
children.push(k)
else
out += safe(k) + separator + safe(val) + eol
}
if (opt.section && out.length)
out = '[' + safe(opt.section) + ']' + eol + out
for (const k of children) {
const nk = dotSplit(k).join('\\.')
const section = (opt.section ? opt.section + '.' : '') + nk
const { whitespace } = opt
const child = encode(obj[k], {
section,
whitespace,
})
if (out.length && child.length)
out += eol
out += child
}
return out
}
const dotSplit = str =>
str.replace(/\1/g, '\u0002LITERAL\\1LITERAL\u0002')
.replace(/\\\./g, '\u0001')
.split(/\./)
.map(part =>
part.replace(/\1/g, '\\.')
.replace(/\2LITERAL\\1LITERAL\2/g, '\u0001'))
const decode = str => {
const out = Object.create(null)
let p = out
let section = null
// section |key = value
const re = /^\[([^\]]*)\]$|^([^=]+)(=(.*))?$/i
const lines = str.split(/[\r\n]+/g)
for (const line of lines) {
if (!line || line.match(/^\s*[;#]/))
continue
const match = line.match(re)
if (!match)
continue
if (match[1] !== undefined) {
section = unsafe(match[1])
if (section === '__proto__') {
// not allowed
// keep parsing the section, but don't attach it.
p = Object.create(null)
continue
}
p = out[section] = out[section] || Object.create(null)
continue
}
const keyRaw = unsafe(match[2])
const isArray = keyRaw.length > 2 && keyRaw.slice(-2) === '[]'
const key = isArray ? keyRaw.slice(0, -2) : keyRaw
if (key === '__proto__')
continue
const valueRaw = match[3] ? unsafe(match[4]) : true
const value = valueRaw === 'true' ||
valueRaw === 'false' ||
valueRaw === 'null' ? JSON.parse(valueRaw)
: valueRaw
// Convert keys with '[]' suffix to an array
if (isArray) {
if (!hasOwnProperty.call(p, key))
p[key] = []
else if (!Array.isArray(p[key]))
p[key] = [p[key]]
}
// safeguard against resetting a previously defined
// array by accidentally forgetting the brackets
if (Array.isArray(p[key]))
p[key].push(value)
else
p[key] = value
}
// {a:{y:1},"a.b":{x:2}} --> {a:{y:1,b:{x:2}}}
// use a filter to return the keys that have to be deleted.
const remove = []
for (const k of Object.keys(out)) {
if (!hasOwnProperty.call(out, k) ||
typeof out[k] !== 'object' ||
Array.isArray(out[k]))
continue
// see if the parent section is also an object.
// if so, add it to that, and mark this one for deletion
const parts = dotSplit(k)
let p = out
const l = parts.pop()
const nl = l.replace(/\\\./g, '.')
for (const part of parts) {
if (part === '__proto__')
continue
if (!hasOwnProperty.call(p, part) || typeof p[part] !== 'object')
p[part] = Object.create(null)
p = p[part]
}
if (p === out && nl === l)
continue
p[nl] = out[k]
remove.push(k)
}
for (const del of remove)
delete out[del]
return out
}
const isQuoted = val =>
(val.charAt(0) === '"' && val.slice(-1) === '"') ||
(val.charAt(0) === "'" && val.slice(-1) === "'")
const safe = val =>
(typeof val !== 'string' ||
val.match(/[=\r\n]/) ||
val.match(/^\[/) ||
(val.length > 1 &&
isQuoted(val)) ||
val !== val.trim())
? JSON.stringify(val)
: val.replace(/;/g, '\\;').replace(/#/g, '\\#')
const unsafe = (val, doUnesc) => {
val = (val || '').trim()
if (isQuoted(val)) {
// remove the single quotes before calling JSON.parse
if (val.charAt(0) === "'")
val = val.substr(1, val.length - 2)
try {
val = JSON.parse(val)
} catch (_) {}
} else {
// walk the val to find the first not-escaped ; character
let esc = false
let unesc = ''
for (let i = 0, l = val.length; i < l; i++) {
const c = val.charAt(i)
if (esc) {
if ('\\;#'.indexOf(c) !== -1)
unesc += c
else
unesc += '\\' + c
esc = false
} else if (';#'.indexOf(c) !== -1)
break
else if (c === '\\')
esc = true
else
unesc += c
}
if (esc)
unesc += '\\'
return unesc.trim()
}
return val
}
module.exports = {
parse: decode,
decode,
stringify: encode,
encode,
safe,
unsafe,
}
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