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