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exports.parse = exports.decode = decode

exports.stringify = exports.encode = encode

exports.safe = safe

exports.unsafe = unsafe

var eol = typeof process !== 'undefined' &&

process.platform === 'win32' ? '\r\n' : '\n'

function encode (obj, opt) {

var children = []

var out = ''

if (typeof opt === 'string') {

opt = {

section: opt,

whitespace: false

}

} else {

opt = opt || {}

opt.whitespace = opt.whitespace === true

}

var separator = opt.whitespace ? ' = ' : '='

Object.keys(obj).forEach(function (k, _, __) {

var val = obj[k]

if (val && Array.isArray(val)) {

val.forEach(function (item) {

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

}

children.forEach(function (k, _, __) {

var nk = dotSplit(k).join('\\.')

var section = (opt.section ? opt.section + '.' : '') + nk

var child = encode(obj[k], {

section: section,

whitespace: opt.whitespace

})

if (out.length && child.length) {

out += eol

}

out += child

})

return out

}

function dotSplit (str) {

return str.replace(/\1/g, '\u0002LITERAL\\1LITERAL\u0002')

.replace(/\\\./g, '\u0001')

.split(/\./).map(function (part) {

return part.replace(/\1/g, '\\.')

.replace(/\2LITERAL\\1LITERAL\2/g, '\u0001')

})

}

function decode (str) {

var out = {}

var p = out

var section = null

// section |key = value

var re = /^\[([^\]]*)\]$|^([^=]+)(=(.*))?$/i

var lines = str.split(/[\r\n]+/g)

lines.forEach(function (line, _, __) {

if (!line || line.match(/^\s*[;#]/)) return

var match = line.match(re)

if (!match) return

if (match[1] !== undefined) {

section = unsafe(match[1])

p = out[section] = out[section] || {}

return

}

var key = unsafe(match[2])

var value = match[3] ? unsafe(match[4]) : true

switch (value) {

case 'true':

case 'false':

case 'null': value = JSON.parse(value)

}

// Convert keys with '[]' suffix to an array

if (key.length > 2 && key.slice(-2) === '[]') {

key = key.substring(0, key.length - 2)

if (!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.

Object.keys(out).filter(function (k, _, __) {

if (!out[k] ||

typeof out[k] !== 'object' ||

Array.isArray(out[k])) {

return false

}

// see if the parent section is also an object.

// if so, add it to that, and mark this one for deletion

var parts = dotSplit(k)

var p = out

var l = parts.pop()

var nl = l.replace(/\\\./g, '.')

parts.forEach(function (part, _, __) {

if (!p[part] || typeof p[part] !== 'object') p[part] = {}

p = p[part]

})

if (p === out && nl === l) {

return false

}

p[nl] = out[k]

return true

}).forEach(function (del, _, __) {

delete out[del]

})

return out

}

function isQuoted (val) {

return (val.charAt(0) === '"' && val.slice(-1) === '"') ||

(val.charAt(0) === "'" && val.slice(-1) === "'")

}

function safe (val) {

return (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, '\\#')

}

function 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

var esc = false

var unesc = ''

for (var i = 0, l = val.length; i < l; i++) {

var 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

}