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135 lines
2.8 KiB
135 lines
2.8 KiB
var _fs
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try {
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_fs = require('graceful-fs')
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} catch (_) {
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_fs = require('fs')
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}
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function readFile (file, options, callback) {
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if (callback == null) {
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callback = options
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options = {}
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}
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if (typeof options === 'string') {
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options = {encoding: options}
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}
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options = options || {}
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var fs = options.fs || _fs
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var shouldThrow = true
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if ('throws' in options) {
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shouldThrow = options.throws
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}
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fs.readFile(file, options, function (err, data) {
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if (err) return callback(err)
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data = stripBom(data)
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var obj
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try {
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obj = JSON.parse(data, options ? options.reviver : null)
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} catch (err2) {
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if (shouldThrow) {
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err2.message = file + ': ' + err2.message
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return callback(err2)
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} else {
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return callback(null, null)
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}
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}
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callback(null, obj)
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})
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}
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function readFileSync (file, options) {
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options = options || {}
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if (typeof options === 'string') {
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options = {encoding: options}
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}
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var fs = options.fs || _fs
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var shouldThrow = true
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if ('throws' in options) {
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shouldThrow = options.throws
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}
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try {
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var content = fs.readFileSync(file, options)
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content = stripBom(content)
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return JSON.parse(content, options.reviver)
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} catch (err) {
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if (shouldThrow) {
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err.message = file + ': ' + err.message
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throw err
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} else {
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return null
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}
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}
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}
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function stringify (obj, options) {
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var spaces
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var EOL = '\n'
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if (typeof options === 'object' && options !== null) {
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if (options.spaces) {
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spaces = options.spaces
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}
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if (options.EOL) {
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EOL = options.EOL
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}
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}
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var str = JSON.stringify(obj, options ? options.replacer : null, spaces)
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return str.replace(/\n/g, EOL) + EOL
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}
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function writeFile (file, obj, options, callback) {
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if (callback == null) {
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callback = options
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options = {}
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}
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options = options || {}
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var fs = options.fs || _fs
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var str = ''
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try {
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str = stringify(obj, options)
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} catch (err) {
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// Need to return whether a callback was passed or not
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if (callback) callback(err, null)
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return
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}
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fs.writeFile(file, str, options, callback)
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}
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function writeFileSync (file, obj, options) {
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options = options || {}
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var fs = options.fs || _fs
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var str = stringify(obj, options)
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// not sure if fs.writeFileSync returns anything, but just in case
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return fs.writeFileSync(file, str, options)
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}
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function stripBom (content) {
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// we do this because JSON.parse would convert it to a utf8 string if encoding wasn't specified
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if (Buffer.isBuffer(content)) content = content.toString('utf8')
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content = content.replace(/^\uFEFF/, '')
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return content
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}
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var jsonfile = {
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readFile: readFile,
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readFileSync: readFileSync,
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writeFile: writeFile,
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writeFileSync: writeFileSync
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}
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module.exports = jsonfile
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