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/*
CSV Parse
Please look at the [project documentation](https://csv.js.org/parse/) for
additional information.
*/
const { Transform } = require('stream')
const ResizeableBuffer = require('./ResizeableBuffer')
// white space characters
// https://en.wikipedia.org/wiki/Whitespace_character
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes#Types
// \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff
const tab = 9
const nl = 10 // \n, 0x0A in hexadecimal, 10 in decimal
const np = 12
const cr = 13 // \r, 0x0D in hexadécimal, 13 in decimal
const space = 32
const boms = {
// Note, the following are equals:
// Buffer.from("\ufeff")
// Buffer.from([239, 187, 191])
// Buffer.from('EFBBBF', 'hex')
'utf8': Buffer.from([239, 187, 191]),
// Note, the following are equals:
// Buffer.from "\ufeff", 'utf16le
// Buffer.from([255, 254])
'utf16le': Buffer.from([255, 254])
}
class Parser extends Transform {
constructor(opts = {}){
super({...{readableObjectMode: true}, ...opts, encoding: null})
this.__originalOptions = opts
this.__normalizeOptions(opts)
}
__normalizeOptions(opts){
const options = {}
// Merge with user options
for(let opt in opts){
options[underscore(opt)] = opts[opt]
}
// Normalize option `encoding`
// Note: defined first because other options depends on it
// to convert chars/strings into buffers.
if(options.encoding === undefined || options.encoding === true){
options.encoding = 'utf8'
}else if(options.encoding === null || options.encoding === false){
options.encoding = null
}else if(typeof options.encoding !== 'string' && options.encoding !== null){
throw new CsvError('CSV_INVALID_OPTION_ENCODING', [
'Invalid option encoding:',
'encoding must be a string or null to return a buffer,',
`got ${JSON.stringify(options.encoding)}`
], options)
}
// Normalize option `bom`
if(options.bom === undefined || options.bom === null || options.bom === false){
options.bom = false
}else if(options.bom !== true){
throw new CsvError('CSV_INVALID_OPTION_BOM', [
'Invalid option bom:', 'bom must be true,',
`got ${JSON.stringify(options.bom)}`
], options)
}
// Normalize option `cast`
let fnCastField = null
if(options.cast === undefined || options.cast === null || options.cast === false || options.cast === ''){
options.cast = undefined
}else if(typeof options.cast === 'function'){
fnCastField = options.cast
options.cast = true
}else if(options.cast !== true){
throw new CsvError('CSV_INVALID_OPTION_CAST', [
'Invalid option cast:', 'cast must be true or a function,',
`got ${JSON.stringify(options.cast)}`
], options)
}
// Normalize option `cast_date`
if(options.cast_date === undefined || options.cast_date === null || options.cast_date === false || options.cast_date === ''){
options.cast_date = false
}else if(options.cast_date === true){
options.cast_date = function(value){
const date = Date.parse(value)
return !isNaN(date) ? new Date(date) : value
}
}else{
throw new CsvError('CSV_INVALID_OPTION_CAST_DATE', [
'Invalid option cast_date:', 'cast_date must be true or a function,',
`got ${JSON.stringify(options.cast_date)}`
], options)
}
// Normalize option `columns`
let fnFirstLineToHeaders = null
if(options.columns === true){
// Fields in the first line are converted as-is to columns
fnFirstLineToHeaders = undefined
}else if(typeof options.columns === 'function'){
fnFirstLineToHeaders = options.columns
options.columns = true
}else if(Array.isArray(options.columns)){
options.columns = normalizeColumnsArray(options.columns)
}else if(options.columns === undefined || options.columns === null || options.columns === false){
options.columns = false
}else{
throw new CsvError('CSV_INVALID_OPTION_COLUMNS', [
'Invalid option columns:',
'expect an array, a function or true,',
`got ${JSON.stringify(options.columns)}`
], options)
}
// Normalize option `columns_duplicates_to_array`
if(options.columns_duplicates_to_array === undefined || options.columns_duplicates_to_array === null || options.columns_duplicates_to_array === false){
options.columns_duplicates_to_array = false
}else if(options.columns_duplicates_to_array !== true){
throw new CsvError('CSV_INVALID_OPTION_COLUMNS_DUPLICATES_TO_ARRAY', [
'Invalid option columns_duplicates_to_array:',
'expect an boolean,',
`got ${JSON.stringify(options.columns_duplicates_to_array)}`
], options)
}else if(options.columns === false){
throw new CsvError('CSV_INVALID_OPTION_COLUMNS_DUPLICATES_TO_ARRAY', [
'Invalid option columns_duplicates_to_array:',
'the `columns` mode must be activated.'
], options)
}
// Normalize option `comment`
if(options.comment === undefined || options.comment === null || options.comment === false || options.comment === ''){
options.comment = null
}else{
if(typeof options.comment === 'string'){
options.comment = Buffer.from(options.comment, options.encoding)
}
if(!Buffer.isBuffer(options.comment)){
throw new CsvError('CSV_INVALID_OPTION_COMMENT', [
'Invalid option comment:',
'comment must be a buffer or a string,',
`got ${JSON.stringify(options.comment)}`
], options)
}
}
// Normalize option `delimiter`
const delimiter_json = JSON.stringify(options.delimiter)
if(!Array.isArray(options.delimiter)) options.delimiter = [options.delimiter]
if(options.delimiter.length === 0){
throw new CsvError('CSV_INVALID_OPTION_DELIMITER', [
'Invalid option delimiter:',
'delimiter must be a non empty string or buffer or array of string|buffer,',
`got ${delimiter_json}`
], options)
}
options.delimiter = options.delimiter.map(function(delimiter){
if(delimiter === undefined || delimiter === null || delimiter === false){
return Buffer.from(',', options.encoding)
}
if(typeof delimiter === 'string'){
delimiter = Buffer.from(delimiter, options.encoding)
}
if( !Buffer.isBuffer(delimiter) || delimiter.length === 0){
throw new CsvError('CSV_INVALID_OPTION_DELIMITER', [
'Invalid option delimiter:',
'delimiter must be a non empty string or buffer or array of string|buffer,',
`got ${delimiter_json}`
], options)
}
return delimiter
})
// Normalize option `escape`
if(options.escape === undefined || options.escape === true){
options.escape = Buffer.from('"', options.encoding)
}else if(typeof options.escape === 'string'){
options.escape = Buffer.from(options.escape, options.encoding)
}else if (options.escape === null || options.escape === false){
options.escape = null
}
if(options.escape !== null){
if(!Buffer.isBuffer(options.escape)){
throw new Error(`Invalid Option: escape must be a buffer, a string or a boolean, got ${JSON.stringify(options.escape)}`)
}
}
// Normalize option `from`
if(options.from === undefined || options.from === null){
options.from = 1
}else{
if(typeof options.from === 'string' && /\d+/.test(options.from)){
options.from = parseInt(options.from)
}
if(Number.isInteger(options.from)){
if(options.from < 0){
throw new Error(`Invalid Option: from must be a positive integer, got ${JSON.stringify(opts.from)}`)
}
}else{
throw new Error(`Invalid Option: from must be an integer, got ${JSON.stringify(options.from)}`)
}
}
// Normalize option `from_line`
if(options.from_line === undefined || options.from_line === null){
options.from_line = 1
}else{
if(typeof options.from_line === 'string' && /\d+/.test(options.from_line)){
options.from_line = parseInt(options.from_line)
}
if(Number.isInteger(options.from_line)){
if(options.from_line <= 0){
throw new Error(`Invalid Option: from_line must be a positive integer greater than 0, got ${JSON.stringify(opts.from_line)}`)
}
}else{
throw new Error(`Invalid Option: from_line must be an integer, got ${JSON.stringify(opts.from_line)}`)
}
}
// Normalize options `ignore_last_delimiters`
if(options.ignore_last_delimiters === undefined || options.ignore_last_delimiters === null){
options.ignore_last_delimiters = false
}else if(typeof options.ignore_last_delimiters === 'number'){
options.ignore_last_delimiters = Math.floor(options.ignore_last_delimiters)
if(options.ignore_last_delimiters === 0){
options.ignore_last_delimiters = false
}
}else if(typeof options.ignore_last_delimiters !== 'boolean'){
throw new CsvError('CSV_INVALID_OPTION_IGNORE_LAST_DELIMITERS', [
'Invalid option `ignore_last_delimiters`:',
'the value must be a boolean value or an integer,',
`got ${JSON.stringify(options.ignore_last_delimiters)}`
], options)
}
if(options.ignore_last_delimiters === true && options.columns === false){
throw new CsvError('CSV_IGNORE_LAST_DELIMITERS_REQUIRES_COLUMNS', [
'The option `ignore_last_delimiters`',
'requires the activation of the `columns` option'
], options)
}
// Normalize option `info`
if(options.info === undefined || options.info === null || options.info === false){
options.info = false
}else if(options.info !== true){
throw new Error(`Invalid Option: info must be true, got ${JSON.stringify(options.info)}`)
}
// Normalize option `max_record_size`
if(options.max_record_size === undefined || options.max_record_size === null || options.max_record_size === false){
options.max_record_size = 0
}else if(Number.isInteger(options.max_record_size) && options.max_record_size >= 0){
// Great, nothing to do
}else if(typeof options.max_record_size === 'string' && /\d+/.test(options.max_record_size)){
options.max_record_size = parseInt(options.max_record_size)
}else{
throw new Error(`Invalid Option: max_record_size must be a positive integer, got ${JSON.stringify(options.max_record_size)}`)
}
// Normalize option `objname`
if(options.objname === undefined || options.objname === null || options.objname === false){
options.objname = undefined
}else if(Buffer.isBuffer(options.objname)){
if(options.objname.length === 0){
throw new Error(`Invalid Option: objname must be a non empty buffer`)
}
if(options.encoding === null){
// Don't call `toString`, leave objname as a buffer
}else{
options.objname = options.objname.toString(options.encoding)
}
}else if(typeof options.objname === 'string'){
if(options.objname.length === 0){
throw new Error(`Invalid Option: objname must be a non empty string`)
}
// Great, nothing to do
}else{
throw new Error(`Invalid Option: objname must be a string or a buffer, got ${options.objname}`)
}
// Normalize option `on_record`
if(options.on_record === undefined || options.on_record === null){
options.on_record = undefined
}else if(typeof options.on_record !== 'function'){
throw new CsvError('CSV_INVALID_OPTION_ON_RECORD', [
'Invalid option `on_record`:',
'expect a function,',
`got ${JSON.stringify(options.on_record)}`
], options)
}
// Normalize option `quote`
if(options.quote === null || options.quote === false || options.quote === ''){
options.quote = null
}else{
if(options.quote === undefined || options.quote === true){
options.quote = Buffer.from('"', options.encoding)
}else if(typeof options.quote === 'string'){
options.quote = Buffer.from(options.quote, options.encoding)
}
if(!Buffer.isBuffer(options.quote)){
throw new Error(`Invalid Option: quote must be a buffer or a string, got ${JSON.stringify(options.quote)}`)
}
}
// Normalize option `raw`
if(options.raw === undefined || options.raw === null || options.raw === false){
options.raw = false
}else if(options.raw !== true){
throw new Error(`Invalid Option: raw must be true, got ${JSON.stringify(options.raw)}`)
}
// Normalize option `record_delimiter`
if(!options.record_delimiter){
options.record_delimiter = []
}else if(!Array.isArray(options.record_delimiter)){
options.record_delimiter = [options.record_delimiter]
}
options.record_delimiter = options.record_delimiter.map( function(rd){
if(typeof rd === 'string'){
rd = Buffer.from(rd, options.encoding)
}
return rd
})
// Normalize option `relax`
if(typeof options.relax === 'boolean'){
// Great, nothing to do
}else if(options.relax === undefined || options.relax === null){
options.relax = false
}else{
throw new Error(`Invalid Option: relax must be a boolean, got ${JSON.stringify(options.relax)}`)
}
// Normalize option `relax_column_count`
if(typeof options.relax_column_count === 'boolean'){
// Great, nothing to do
}else if(options.relax_column_count === undefined || options.relax_column_count === null){
options.relax_column_count = false
}else{
throw new Error(`Invalid Option: relax_column_count must be a boolean, got ${JSON.stringify(options.relax_column_count)}`)
}
if(typeof options.relax_column_count_less === 'boolean'){
// Great, nothing to do
}else if(options.relax_column_count_less === undefined || options.relax_column_count_less === null){
options.relax_column_count_less = false
}else{
throw new Error(`Invalid Option: relax_column_count_less must be a boolean, got ${JSON.stringify(options.relax_column_count_less)}`)
}
if(typeof options.relax_column_count_more === 'boolean'){
// Great, nothing to do
}else if(options.relax_column_count_more === undefined || options.relax_column_count_more === null){
options.relax_column_count_more = false
}else{
throw new Error(`Invalid Option: relax_column_count_more must be a boolean, got ${JSON.stringify(options.relax_column_count_more)}`)
}
// Normalize option `skip_empty_lines`
if(typeof options.skip_empty_lines === 'boolean'){
// Great, nothing to do
}else if(options.skip_empty_lines === undefined || options.skip_empty_lines === null){
options.skip_empty_lines = false
}else{
throw new Error(`Invalid Option: skip_empty_lines must be a boolean, got ${JSON.stringify(options.skip_empty_lines)}`)
}
// Normalize option `skip_lines_with_empty_values`
if(typeof options.skip_lines_with_empty_values === 'boolean'){
// Great, nothing to do
}else if(options.skip_lines_with_empty_values === undefined || options.skip_lines_with_empty_values === null){
options.skip_lines_with_empty_values = false
}else{
throw new Error(`Invalid Option: skip_lines_with_empty_values must be a boolean, got ${JSON.stringify(options.skip_lines_with_empty_values)}`)
}
// Normalize option `skip_lines_with_error`
if(typeof options.skip_lines_with_error === 'boolean'){
// Great, nothing to do
}else if(options.skip_lines_with_error === undefined || options.skip_lines_with_error === null){
options.skip_lines_with_error = false
}else{
throw new Error(`Invalid Option: skip_lines_with_error must be a boolean, got ${JSON.stringify(options.skip_lines_with_error)}`)
}
// Normalize option `rtrim`
if(options.rtrim === undefined || options.rtrim === null || options.rtrim === false){
options.rtrim = false
}else if(options.rtrim !== true){
throw new Error(`Invalid Option: rtrim must be a boolean, got ${JSON.stringify(options.rtrim)}`)
}
// Normalize option `ltrim`
if(options.ltrim === undefined || options.ltrim === null || options.ltrim === false){
options.ltrim = false
}else if(options.ltrim !== true){
throw new Error(`Invalid Option: ltrim must be a boolean, got ${JSON.stringify(options.ltrim)}`)
}
// Normalize option `trim`
if(options.trim === undefined || options.trim === null || options.trim === false){
options.trim = false
}else if(options.trim !== true){
throw new Error(`Invalid Option: trim must be a boolean, got ${JSON.stringify(options.trim)}`)
}
// Normalize options `trim`, `ltrim` and `rtrim`
if(options.trim === true && opts.ltrim !== false){
options.ltrim = true
}else if(options.ltrim !== true){
options.ltrim = false
}
if(options.trim === true && opts.rtrim !== false){
options.rtrim = true
}else if(options.rtrim !== true){
options.rtrim = false
}
// Normalize option `to`
if(options.to === undefined || options.to === null){
options.to = -1
}else{
if(typeof options.to === 'string' && /\d+/.test(options.to)){
options.to = parseInt(options.to)
}
if(Number.isInteger(options.to)){
if(options.to <= 0){
throw new Error(`Invalid Option: to must be a positive integer greater than 0, got ${JSON.stringify(opts.to)}`)
}
}else{
throw new Error(`Invalid Option: to must be an integer, got ${JSON.stringify(opts.to)}`)
}
}
// Normalize option `to_line`
if(options.to_line === undefined || options.to_line === null){
options.to_line = -1
}else{
if(typeof options.to_line === 'string' && /\d+/.test(options.to_line)){
options.to_line = parseInt(options.to_line)
}
if(Number.isInteger(options.to_line)){
if(options.to_line <= 0){
throw new Error(`Invalid Option: to_line must be a positive integer greater than 0, got ${JSON.stringify(opts.to_line)}`)
}
}else{
throw new Error(`Invalid Option: to_line must be an integer, got ${JSON.stringify(opts.to_line)}`)
}
}
this.info = {
bytes: 0,
comment_lines: 0,
empty_lines: 0,
invalid_field_length: 0,
lines: 1,
records: 0
}
this.options = options
this.state = {
bomSkipped: false,
bufBytesStart: 0,
castField: fnCastField,
commenting: false,
// Current error encountered by a record
error: undefined,
enabled: options.from_line === 1,
escaping: false,
// escapeIsQuote: options.escape === options.quote,
escapeIsQuote: Buffer.isBuffer(options.escape) && Buffer.isBuffer(options.quote) && Buffer.compare(options.escape, options.quote) === 0,
// columns can be `false`, `true`, `Array`
expectedRecordLength: Array.isArray(options.columns) ? options.columns.length : undefined,
field: new ResizeableBuffer(20),
firstLineToHeaders: fnFirstLineToHeaders,
needMoreDataSize: Math.max(
// Skip if the remaining buffer smaller than comment
options.comment !== null ? options.comment.length : 0,
// Skip if the remaining buffer can be delimiter
...options.delimiter.map( (delimiter) => delimiter.length),
// Skip if the remaining buffer can be escape sequence
options.quote !== null ? options.quote.length : 0,
),
previousBuf: undefined,
quoting: false,
stop: false,
rawBuffer: new ResizeableBuffer(100),
record: [],
recordHasError: false,
record_length: 0,
recordDelimiterMaxLength: options.record_delimiter.length === 0 ? 2 : Math.max(...options.record_delimiter.map( (v) => v.length)),
trimChars: [Buffer.from(' ', options.encoding)[0], Buffer.from('\t', options.encoding)[0]],
wasQuoting: false,
wasRowDelimiter: false
}
}
// Implementation of `Transform._transform`
_transform(buf, encoding, callback){
if(this.state.stop === true){
return
}
const err = this.__parse(buf, false)
if(err !== undefined){
this.state.stop = true
}
callback(err)
}
// Implementation of `Transform._flush`
_flush(callback){
if(this.state.stop === true){
return
}
const err = this.__parse(undefined, true)
callback(err)
}
// Central parser implementation
__parse(nextBuf, end){
const {bom, comment, escape, from_line, ltrim, max_record_size, quote, raw, relax, rtrim, skip_empty_lines, to, to_line} = this.options
let {record_delimiter} = this.options
const {bomSkipped, previousBuf, rawBuffer, escapeIsQuote} = this.state
let buf
if(previousBuf === undefined){
if(nextBuf === undefined){
// Handle empty string
this.push(null)
return
}else{
buf = nextBuf
}
}else if(previousBuf !== undefined && nextBuf === undefined){
buf = previousBuf
}else{
buf = Buffer.concat([previousBuf, nextBuf])
}
// Handle UTF BOM
if(bomSkipped === false){
if(bom === false){
this.state.bomSkipped = true
}else if(buf.length < 3){
// No enough data
if(end === false){
// Wait for more data
this.state.previousBuf = buf
return
}
}else{
for(let encoding in boms){
if(boms[encoding].compare(buf, 0, boms[encoding].length) === 0){
// Skip BOM
let bomLength = boms[encoding].length
this.state.bufBytesStart += bomLength
buf = buf.slice(bomLength)
// Renormalize original options with the new encoding
this.__normalizeOptions({...this.__originalOptions, encoding: encoding})
break
}
}
this.state.bomSkipped = true
}
}
const bufLen = buf.length
let pos
for(pos = 0; pos < bufLen; pos++){
// Ensure we get enough space to look ahead
// There should be a way to move this out of the loop
if(this.__needMoreData(pos, bufLen, end)){
break
}
if(this.state.wasRowDelimiter === true){
this.info.lines++
this.state.wasRowDelimiter = false
}
if(to_line !== -1 && this.info.lines > to_line){
this.state.stop = true
this.push(null)
return
}
// Auto discovery of record_delimiter, unix, mac and windows supported
if(this.state.quoting === false && record_delimiter.length === 0){
const record_delimiterCount = this.__autoDiscoverRecordDelimiter(buf, pos)
if(record_delimiterCount){
record_delimiter = this.options.record_delimiter
}
}
const chr = buf[pos]
if(raw === true){
rawBuffer.append(chr)
}
if((chr === cr || chr === nl) && this.state.wasRowDelimiter === false ){
this.state.wasRowDelimiter = true
}
// Previous char was a valid escape char
// treat the current char as a regular char
if(this.state.escaping === true){
this.state.escaping = false
}else{
// Escape is only active inside quoted fields
// We are quoting, the char is an escape chr and there is a chr to escape
// if(escape !== null && this.state.quoting === true && chr === escape && pos + 1 < bufLen){
if(escape !== null && this.state.quoting === true && this.__isEscape(buf, pos, chr) && pos + escape.length < bufLen){
if(escapeIsQuote){
if(this.__isQuote(buf, pos+escape.length)){
this.state.escaping = true
pos += escape.length - 1
continue
}
}else{
this.state.escaping = true
pos += escape.length - 1
continue
}
}
// Not currently escaping and chr is a quote
// TODO: need to compare bytes instead of single char
if(this.state.commenting === false && this.__isQuote(buf, pos)){
if(this.state.quoting === true){
const nextChr = buf[pos+quote.length]
const isNextChrTrimable = rtrim && this.__isCharTrimable(nextChr)
const isNextChrComment = comment !== null && this.__compareBytes(comment, buf, pos+quote.length, nextChr)
const isNextChrDelimiter = this.__isDelimiter(buf, pos+quote.length, nextChr)
const isNextChrRecordDelimiter = record_delimiter.length === 0 ? this.__autoDiscoverRecordDelimiter(buf, pos+quote.length) : this.__isRecordDelimiter(nextChr, buf, pos+quote.length)
// Escape a quote
// Treat next char as a regular character
if(escape !== null && this.__isEscape(buf, pos, chr) && this.__isQuote(buf, pos + escape.length)){
pos += escape.length - 1
}else if(!nextChr || isNextChrDelimiter || isNextChrRecordDelimiter || isNextChrComment || isNextChrTrimable){
this.state.quoting = false
this.state.wasQuoting = true
pos += quote.length - 1
continue
}else if(relax === false){
const err = this.__error(
new CsvError('CSV_INVALID_CLOSING_QUOTE', [
'Invalid Closing Quote:',
`got "${String.fromCharCode(nextChr)}"`,
`at line ${this.info.lines}`,
'instead of delimiter, record delimiter, trimable character',
'(if activated) or comment',
], this.options, this.__infoField())
)
if(err !== undefined) return err
}else{
this.state.quoting = false
this.state.wasQuoting = true
this.state.field.prepend(quote)
pos += quote.length - 1
}
}else{
if(this.state.field.length !== 0){
// In relax mode, treat opening quote preceded by chrs as regular
if( relax === false ){
const err = this.__error(
new CsvError('INVALID_OPENING_QUOTE', [
'Invalid Opening Quote:',
`a quote is found inside a field at line ${this.info.lines}`,
], this.options, this.__infoField(), {
field: this.state.field,
})
)
if(err !== undefined) return err
}
}else{
this.state.quoting = true
pos += quote.length - 1
continue
}
}
}
if(this.state.quoting === false){
let recordDelimiterLength = this.__isRecordDelimiter(chr, buf, pos)
if(recordDelimiterLength !== 0){
// Do not emit comments which take a full line
const skipCommentLine = this.state.commenting && (this.state.wasQuoting === false && this.state.record.length === 0 && this.state.field.length === 0)
if(skipCommentLine){
this.info.comment_lines++
// Skip full comment line
}else{
// Activate records emition if above from_line
if(this.state.enabled === false && this.info.lines + (this.state.wasRowDelimiter === true ? 1: 0) >= from_line){
this.state.enabled = true
this.__resetField()
this.__resetRecord()
pos += recordDelimiterLength - 1
continue
}
// Skip if line is empty and skip_empty_lines activated
if(skip_empty_lines === true && this.state.wasQuoting === false && this.state.record.length === 0 && this.state.field.length === 0){
this.info.empty_lines++
pos += recordDelimiterLength - 1
continue
}
this.info.bytes = this.state.bufBytesStart + pos;
const errField = this.__onField()
if(errField !== undefined) return errField
this.info.bytes = this.state.bufBytesStart + pos + recordDelimiterLength;
const errRecord = this.__onRecord()
if(errRecord !== undefined) return errRecord
if(to !== -1 && this.info.records >= to){
this.state.stop = true
this.push(null)
return
}
}
this.state.commenting = false
pos += recordDelimiterLength - 1
continue
}
if(this.state.commenting){
continue
}
const commentCount = comment === null ? 0 : this.__compareBytes(comment, buf, pos, chr)
if(commentCount !== 0){
this.state.commenting = true
continue
}
let delimiterLength = this.__isDelimiter(buf, pos, chr)
if(delimiterLength !== 0){
this.info.bytes = this.state.bufBytesStart + pos;
const errField = this.__onField()
if(errField !== undefined) return errField
pos += delimiterLength - 1
continue
}
}
}
if(this.state.commenting === false){
if(max_record_size !== 0 && this.state.record_length + this.state.field.length > max_record_size){
const err = this.__error(
new CsvError('CSV_MAX_RECORD_SIZE', [
'Max Record Size:',
'record exceed the maximum number of tolerated bytes',
`of ${max_record_size}`,
`at line ${this.info.lines}`,
], this.options, this.__infoField())
)
if(err !== undefined) return err
}
}
const lappend = ltrim === false || this.state.quoting === true || this.state.field.length !== 0 || !this.__isCharTrimable(chr)
// rtrim in non quoting is handle in __onField
const rappend = rtrim === false || this.state.wasQuoting === false
if( lappend === true && rappend === true ){
this.state.field.append(chr)
}else if(rtrim === true && !this.__isCharTrimable(chr)){
const err = this.__error(
new CsvError('CSV_NON_TRIMABLE_CHAR_AFTER_CLOSING_QUOTE', [
'Invalid Closing Quote:',
'found non trimable byte after quote',
`at line ${this.info.lines}`,
], this.options, this.__infoField())
)
if(err !== undefined) return err
}
}
if(end === true){
// Ensure we are not ending in a quoting state
if(this.state.quoting === true){
const err = this.__error(
new CsvError('CSV_QUOTE_NOT_CLOSED', [
'Quote Not Closed:',
`the parsing is finished with an opening quote at line ${this.info.lines}`,
], this.options, this.__infoField())
)
if(err !== undefined) return err
}else{
// Skip last line if it has no characters
if(this.state.wasQuoting === true || this.state.record.length !== 0 || this.state.field.length !== 0){
this.info.bytes = this.state.bufBytesStart + pos;
const errField = this.__onField()
if(errField !== undefined) return errField
const errRecord = this.__onRecord()
if(errRecord !== undefined) return errRecord
}else if(this.state.wasRowDelimiter === true){
this.info.empty_lines++
}else if(this.state.commenting === true){
this.info.comment_lines++
}
}
}else{
this.state.bufBytesStart += pos
this.state.previousBuf = buf.slice(pos)
}
if(this.state.wasRowDelimiter === true){
this.info.lines++
this.state.wasRowDelimiter = false
}
}
__onRecord(){
const {columns, columns_duplicates_to_array, encoding, info, from, relax_column_count, relax_column_count_less, relax_column_count_more, raw, skip_lines_with_empty_values} = this.options
const {enabled, record} = this.state
if(enabled === false){
return this.__resetRecord()
}
// Convert the first line into column names
const recordLength = record.length
if(columns === true){
if(skip_lines_with_empty_values === true && isRecordEmpty(record)){
this.__resetRecord()
return
}
return this.__firstLineToColumns(record)
}
if(columns === false && this.info.records === 0){
this.state.expectedRecordLength = recordLength
}
if(recordLength !== this.state.expectedRecordLength){
const err = columns === false ?
// Todo: rename CSV_INCONSISTENT_RECORD_LENGTH to
// CSV_RECORD_INCONSISTENT_FIELDS_LENGTH
new CsvError('CSV_INCONSISTENT_RECORD_LENGTH', [
'Invalid Record Length:',
`expect ${this.state.expectedRecordLength},`,
`got ${recordLength} on line ${this.info.lines}`,
], this.options, this.__infoField(), {
record: record,
})
:
// Todo: rename CSV_RECORD_DONT_MATCH_COLUMNS_LENGTH to
// CSV_RECORD_INCONSISTENT_COLUMNS
new CsvError('CSV_RECORD_DONT_MATCH_COLUMNS_LENGTH', [
'Invalid Record Length:',
`columns length is ${columns.length},`, // rename columns
`got ${recordLength} on line ${this.info.lines}`,
], this.options, this.__infoField(), {
record: record,
})
if(relax_column_count === true ||
(relax_column_count_less === true && recordLength < this.state.expectedRecordLength) ||
(relax_column_count_more === true && recordLength > this.state.expectedRecordLength) ){
this.info.invalid_field_length++
this.state.error = err
// Error is undefined with skip_lines_with_error
}else{
const finalErr = this.__error(err)
if(finalErr) return finalErr
}
}
if(skip_lines_with_empty_values === true && isRecordEmpty(record)){
this.__resetRecord()
return
}
if(this.state.recordHasError === true){
this.__resetRecord()
this.state.recordHasError = false
return
}
this.info.records++
if(from === 1 || this.info.records >= from){
// With columns, records are object
if(columns !== false){
const obj = {}
// Transform record array to an object
for(let i = 0, l = record.length; i < l; i++){
if(columns[i] === undefined || columns[i].disabled) continue
// Turn duplicate columns into an array
if (columns_duplicates_to_array === true && obj[columns[i].name] !== undefined) {
if (Array.isArray(obj[columns[i].name])) {
obj[columns[i].name] = obj[columns[i].name].concat(record[i])
} else {
obj[columns[i].name] = [obj[columns[i].name], record[i]]
}
} else {
obj[columns[i].name] = record[i]
}
}
const {objname} = this.options
// Without objname (default)
if(objname === undefined){
if(raw === true || info === true){
const err = this.__push(Object.assign(
{record: obj},
(raw === true ? {raw: this.state.rawBuffer.toString(encoding)}: {}),
(info === true ? {info: this.__infoRecord()}: {})
))
if(err){
return err
}
}else{
const err = this.__push(obj)
if(err){
return err
}
}
// With objname (default)
}else{
if(raw === true || info === true){
const err = this.__push(Object.assign(
{record: [obj[objname], obj]},
raw === true ? {raw: this.state.rawBuffer.toString(encoding)}: {},
info === true ? {info: this.__infoRecord()}: {}
))
if(err){
return err
}
}else{
const err = this.__push([obj[objname], obj])
if(err){
return err
}
}
}
// Without columns, records are array
}else{
if(raw === true || info === true){
const err = this.__push(Object.assign(
{record: record},
raw === true ? {raw: this.state.rawBuffer.toString(encoding)}: {},
info === true ? {info: this.__infoRecord()}: {}
))
if(err){
return err
}
}else{
const err = this.__push(record)
if(err){
return err
}
}
}
}
this.__resetRecord()
}
__firstLineToColumns(record){
const {firstLineToHeaders} = this.state
try{
const headers = firstLineToHeaders === undefined ? record : firstLineToHeaders.call(null, record)
if(!Array.isArray(headers)){
return this.__error(
new CsvError('CSV_INVALID_COLUMN_MAPPING', [
'Invalid Column Mapping:',
'expect an array from column function,',
`got ${JSON.stringify(headers)}`
], this.options, this.__infoField(), {
headers: headers,
})
)
}
const normalizedHeaders = normalizeColumnsArray(headers)
this.state.expectedRecordLength = normalizedHeaders.length
this.options.columns = normalizedHeaders
this.__resetRecord()
return
}catch(err){
return err
}
}
__resetRecord(){
if(this.options.raw === true){
this.state.rawBuffer.reset()
}
this.state.error = undefined
this.state.record = []
this.state.record_length = 0
}
__onField(){
const {cast, encoding, rtrim, max_record_size} = this.options
const {enabled, wasQuoting} = this.state
// Short circuit for the from_line options
if(enabled === false){
return this.__resetField()
}
let field = this.state.field.toString(encoding)
if(rtrim === true && wasQuoting === false){
field = field.trimRight()
}
if(cast === true){
const [err, f] = this.__cast(field)
if(err !== undefined) return err
field = f
}
this.state.record.push(field)
// Increment record length if record size must not exceed a limit
if(max_record_size !== 0 && typeof field === 'string'){
this.state.record_length += field.length
}
this.__resetField()
}
__resetField(){
this.state.field.reset()
this.state.wasQuoting = false
}
__push(record){
const {on_record} = this.options
if(on_record !== undefined){
const info = this.__infoRecord()
try{
record = on_record.call(null, record, info)
}catch(err){
return err
}
if(record === undefined || record === null){ return }
}
this.push(record)
}
// Return a tuple with the error and the casted value
__cast(field){
const {columns, relax_column_count} = this.options
const isColumns = Array.isArray(columns)
// Dont loose time calling cast
// because the final record is an object
// and this field can't be associated to a key present in columns
if( isColumns === true && relax_column_count && this.options.columns.length <= this.state.record.length ){
return [undefined, undefined]
}
if(this.state.castField !== null){
try{
const info = this.__infoField()
return [undefined, this.state.castField.call(null, field, info)]
}catch(err){
return [err]
}
}
if(this.__isFloat(field)){
return [undefined, parseFloat(field)]
}else if(this.options.cast_date !== false){
const info = this.__infoField()
return [undefined, this.options.cast_date.call(null, field, info)]
}
return [undefined, field]
}
// Helper to test if a character is a space or a line delimiter
__isCharTrimable(chr){
return chr === space || chr === tab || chr === cr || chr === nl || chr === np
}
// Keep it in case we implement the `cast_int` option
// __isInt(value){
// // return Number.isInteger(parseInt(value))
// // return !isNaN( parseInt( obj ) );
// return /^(\-|\+)?[1-9][0-9]*$/.test(value)
// }
__isFloat(value){
return (value - parseFloat( value ) + 1) >= 0 // Borrowed from jquery
}
__compareBytes(sourceBuf, targetBuf, targetPos, firstByte){
if(sourceBuf[0] !== firstByte) return 0
const sourceLength = sourceBuf.length
for(let i = 1; i < sourceLength; i++){
if(sourceBuf[i] !== targetBuf[targetPos+i]) return 0
}
return sourceLength
}
__needMoreData(i, bufLen, end){
if(end) return false
const {quote} = this.options
const {quoting, needMoreDataSize, recordDelimiterMaxLength} = this.state
const numOfCharLeft = bufLen - i - 1
const requiredLength = Math.max(
needMoreDataSize,
// Skip if the remaining buffer smaller than record delimiter
recordDelimiterMaxLength,
// Skip if the remaining buffer can be record delimiter following the closing quote
// 1 is for quote.length
quoting ? (quote.length + recordDelimiterMaxLength) : 0,
)
return numOfCharLeft < requiredLength
}
__isDelimiter(buf, pos, chr){
const {delimiter, ignore_last_delimiters} = this.options
if(ignore_last_delimiters === true && this.state.record.length === this.options.columns.length - 1){
return 0
}else if(ignore_last_delimiters !== false && typeof ignore_last_delimiters === 'number' && this.state.record.length === ignore_last_delimiters - 1){
return 0
}
loop1: for(let i = 0; i < delimiter.length; i++){
const del = delimiter[i]
if(del[0] === chr){
for(let j = 1; j < del.length; j++){
if(del[j] !== buf[pos+j]) continue loop1
}
return del.length
}
}
return 0
}
__isRecordDelimiter(chr, buf, pos){
const {record_delimiter} = this.options
const recordDelimiterLength = record_delimiter.length
loop1: for(let i = 0; i < recordDelimiterLength; i++){
const rd = record_delimiter[i]
const rdLength = rd.length
if(rd[0] !== chr){
continue
}
for(let j = 1; j < rdLength; j++){
if(rd[j] !== buf[pos+j]){
continue loop1
}
}
return rd.length
}
return 0
}
__isEscape(buf, pos, chr){
const {escape} = this.options
if(escape === null) return false
const l = escape.length
if(escape[0] === chr){
for(let i = 0; i < l; i++){
if(escape[i] !== buf[pos+i]){
return false
}
}
return true
}
return false
}
__isQuote(buf, pos){
const {quote} = this.options
if(quote === null) return false
const l = quote.length
for(let i = 0; i < l; i++){
if(quote[i] !== buf[pos+i]){
return false
}
}
return true
}
__autoDiscoverRecordDelimiter(buf, pos){
const {encoding} = this.options
const chr = buf[pos]
if(chr === cr){
if(buf[pos+1] === nl){
this.options.record_delimiter.push(Buffer.from('\r\n', encoding))
this.state.recordDelimiterMaxLength = 2
return 2
}else{
this.options.record_delimiter.push(Buffer.from('\r', encoding))
this.state.recordDelimiterMaxLength = 1
return 1
}
}else if(chr === nl){
this.options.record_delimiter.push(Buffer.from('\n', encoding))
this.state.recordDelimiterMaxLength = 1
return 1
}
return 0
}
__error(msg){
const {skip_lines_with_error} = this.options
const err = typeof msg === 'string' ? new Error(msg) : msg
if(skip_lines_with_error){
this.state.recordHasError = true
this.emit('skip', err)
return undefined
}else{
return err
}
}
__infoDataSet(){
return {
...this.info,
columns: this.options.columns
}
}
__infoRecord(){
const {columns} = this.options
return {
...this.__infoDataSet(),
error: this.state.error,
header: columns === true,
index: this.state.record.length,
}
}
__infoField(){
const {columns} = this.options
const isColumns = Array.isArray(columns)
return {
...this.__infoRecord(),
column: isColumns === true ?
( columns.length > this.state.record.length ?
columns[this.state.record.length].name :
null
) :
this.state.record.length,
quoting: this.state.wasQuoting,
}
}
}
const parse = function(){
let data, options, callback
for(let i in arguments){
const argument = arguments[i]
const type = typeof argument
if(data === undefined && (typeof argument === 'string' || Buffer.isBuffer(argument))){
data = argument
}else if(options === undefined && isObject(argument)){
options = argument
}else if(callback === undefined && type === 'function'){
callback = argument
}else{
throw new CsvError('CSV_INVALID_ARGUMENT', [
'Invalid argument:',
`got ${JSON.stringify(argument)} at index ${i}`
], options || {})
}
}
const parser = new Parser(options)
if(callback){
const records = options === undefined || options.objname === undefined ? [] : {}
parser.on('readable', function(){
let record
while((record = this.read()) !== null){
if(options === undefined || options.objname === undefined){
records.push(record)
}else{
records[record[0]] = record[1]
}
}
})
parser.on('error', function(err){
callback(err, undefined, parser.__infoDataSet())
})
parser.on('end', function(){
callback(undefined, records, parser.__infoDataSet())
})
}
if(data !== undefined){
// Give a chance for events to be registered later
if(typeof setImmediate === 'function'){
setImmediate(function(){
parser.write(data)
parser.end()
})
}else{
parser.write(data)
parser.end()
}
}
return parser
}
class CsvError extends Error {
constructor(code, message, options, ...contexts) {
if(Array.isArray(message)) message = message.join(' ')
super(message)
if(Error.captureStackTrace !== undefined){
Error.captureStackTrace(this, CsvError)
}
this.code = code
for(const context of contexts){
for(const key in context){
const value = context[key]
this[key] = Buffer.isBuffer(value) ? value.toString(options.encoding) : value == null ? value : JSON.parse(JSON.stringify(value))
}
}
}
}
parse.Parser = Parser
parse.CsvError = CsvError
module.exports = parse
const underscore = function(str){
return str.replace(/([A-Z])/g, function(_, match){
return '_' + match.toLowerCase()
})
}
const isObject = function(obj){
return (typeof obj === 'object' && obj !== null && !Array.isArray(obj))
}
const isRecordEmpty = function(record){
return record.every( (field) => field == null || field.toString && field.toString().trim() === '' )
}
const normalizeColumnsArray = function(columns){
const normalizedColumns = [];
for(let i = 0, l = columns.length; i < l; i++){
const column = columns[i]
if(column === undefined || column === null || column === false){
normalizedColumns[i] = { disabled: true }
}else if(typeof column === 'string'){
normalizedColumns[i] = { name: column }
}else if(isObject(column)){
if(typeof column.name !== 'string'){
throw new CsvError('CSV_OPTION_COLUMNS_MISSING_NAME', [
'Option columns missing name:',
`property "name" is required at position ${i}`,
'when column is an object literal'
])
}
normalizedColumns[i] = column
}else{
throw new CsvError('CSV_INVALID_COLUMN_DEFINITION', [
'Invalid column definition:',
'expect a string or a literal object,',
`got ${JSON.stringify(column)} at position ${i}`
])
}
}
return normalizedColumns;
}
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:: Command execute :: | |
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