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module.exports = {
name: 'dsv',
desc: (
'is a delimiter-separated values marshaller:\n\n' +
'--mrecord-separator, --record-separator, -R [char]\nCharacter used to separate records.\n\n' +
'--mdelimiter, --delimiter, -D [char]\nDelimiter used to separate values.\n\n' +
'--mquote, --quote, -Q [char]\nCharacter used to quote strings.\n\n' +
'--mescape, --escape, -C [char]\nCharacter used to escape quote in strings.\n\n' +
'--mheader, --header, -H [string]\nProvide a custom header as a JSON array string.\n\n' +
'--mskip-header, --skip-header, -S [boolean]\nDo not print a header.\n\n' +
'--mallow-list-values, --allow-list-values, -L [boolean]\nIf this flag is set, lists and objects are allowed in csv values. They are encoded as JSON.\n\n' +
'--mfixed-length, --fixed-length, -F [boolean]\nPreprocessing #1: Controls, whether each line has the same number of values. Ignores all deviating lines while reporting errors.\n\n' +
'--mtrim-whitespaces, --trim-whitespaces, -W [boolean]\nPreprocessing #2: Trim whitespaces around values.\n\n' +
'--mempty-as-null, --empty-as-null, -I [boolean]\nPreprocessing #3: Treat empty fields as null.\n\n' +
'--mskip-null, --skip-null, -N [boolean]\nPreprocessing #4: Skip values that are null.\n\n' +
'--mmissing-as, --missing-as, -M [string]\nPreprocessing #5: Treat missing fields (if #values < #keys) as null.\n'
),
func: dsv({}),
dsv
}
function dsv (defaults) {
return argv => {
const {
verbose,
mrecordSeparator, recordSeparator, R,
mdelimiter, delimiter, D,
mquote, quote, Q,
mescape, escape, C,
mheader, header, H,
mskipHeader, skipHeader, S,
mallowListValues, allowListValues, L,
mfixedLength, fixedLength, F,
mtrimWhitespaces, trimWhitespaces, W,
memptyAsNull, emptyAsNull, I,
mskipNull, skipNull, N,
mnullAs, nullAs, A
} = argv
const _recordSeparator = mrecordSeparator || recordSeparator || R || defaults.recordSeparator
const _delimiter = mdelimiter || delimiter || D || defaults.delimiter
const _quote = mquote || quote || Q || defaults.quote
const _escape = mescape || escape || C || defaults.escape
const _header = mheader || header || H || defaults.header
const _skipHeader = mskipHeader || skipHeader || S || defaults.skipHeader || false
const _allowListValues = mallowListValues || allowListValues || L || defaults.allowListValues || false
const _fixedLength = mfixedLength || fixedLength || F || defaults.fixedLength || false
const _trimWhitespaces = mtrimWhitespaces || trimWhitespaces || W || defaults.trimWhitespaces || false
const _emptyAsNull = memptyAsNull || emptyAsNull || I || defaults.emptyAsNull || false
const _skipNull = mskipNull || skipNull || N || defaults.skipNull || false
const _nullAs = typeof mnullAs !== 'undefined' ? mnullAs :
typeof nullAs !== 'undefined' ? nullAs :
typeof A !== 'undefined' ? A :
typeof defaults.nullAs !== 'undefined' ? defaults.nullAs
: undefined
const missingOptions = [
handleMissingOption(_recordSeparator, 'mrecordSeparator, recordSeparator or R', argv),
handleMissingOption(_delimiter, 'mdelimiter, delimiter or D', argv),
handleMissingOption(_quote, 'mquote, quote or Q', argv),
handleMissingOption(_escape, 'mescape, escape or C', argv),
handleMissingOption(_header, 'mheader, header or H', argv)
]
let err = []
for (let i = 0; i < missingOptions.length; i++) {
const errs = missingOptions[i]
err = err.concat(errs)
}
if (err.length > 0) return () => ({err, str: ''})
let keys = JSON.parse(_header)
// skipHeader | header || addProvidedHeader | headerIsSet | ignoreDataHeader
// true | [...] || false | true | true
// true | [] || false | true | true
// false | [...] || true | false | false
// false | [] || false | false | false
const addProvidedHeader = !_skipHeader && keys.length > 0
let headerIsSet = _skipHeader
const fillMissingValues = typeof _nullAs !== 'undefined'
const preprocessingFs = []
if (_trimWhitespaces) preprocessingFs.push(removeWhitespaces)
if (_emptyAsNull) preprocessingFs.push(emptyToNull)
if (_skipNull) preprocessingFs.push(removeNulls)
if (fillMissingValues) preprocessingFs.push(replaceNulls)
const preprocessingF = record => {
let record2 = record
for (let i = 0; i < preprocessingFs.length; i++) {
const f = preprocessingFs[i]
record2 = f(record2)
}
return record2
}
return jsons => {
let err = []
let records = []
if (!headerIsSet && addProvidedHeader) {
records.push(keys)
headerIsSet = true
}
if (!headerIsSet) {
Eif (jsons.length > 0) {
const json = jsons[0]
Iif (Array.isArray(json)) keys = json
else Iif (json === null) keys = []
else Eif (typeof json === 'object') {
keys = Object.keys(json)
records.push(keys)
} else keys = []
}
headerIsSet = true
}
let res = jsonsToRecords(jsons)
Iif (res.err.length > 0) err = err.concat(res.err)
records = records.concat(res.records)
if (_fixedLength) {
res = controlFixedLength(records)
if (res.err.length > 0) err = err.concat(res.err)
records = res.records
}
let str = ''
for (let i = 0; i < records.length; i++) {
let record = records[i]
record = preprocessingF(record)
str += record[0]
for (let i = 1; i < record.length; i++) str += _delimiter + record[i]
str += _recordSeparator
}
return ({err, str})
}
function jsonsToRecords (jsons) {
const err = []
const records = []
for (let i = 0; i < jsons.length; i++) {
const json = jsons[i]
let record = []
if (Array.isArray(json)) record = json
else Eif (typeof json === 'object' && json !== null) {
const keys = Object.keys(json)
for (let j = 0; j < keys.length; j++) {
const key = keys[j]
const value = json[key]
record.push(value)
}
}
const record2 = []
for (let j = 0; j < record.length; j++) {
const field = record[j]
if (typeof field === 'string') {
// add quotes to records?
// escape quotes in records?
record2.push(field)
} else Iif (typeof field === 'number') {
if (Number.isNaN(field)) {
record2.push(null)
} else {
record2.push(field.toString())
}
} else Iif (typeof field === 'boolean') {
record2.push(field.toString())
} else if (typeof field === 'undefined') {
record2.push(null)
} else Eif (field === null) {
record2.push(null)
} else if (Array.isArray(field)) {
if (_allowListValues) {
// in case of string values
// add quotes to records?
// escape quotes in records?
} else {
const msg = {msg: 'Arrays are not allowed as fields'}
const line = verbose > 0 ? {line: -1} : {}
const info = verbose > 1 ? {info: JSON.stringify(field)} : {}
err.push(Object.assign(msg, line, info))
}
} else if (typeof field === 'object') {
if (_allowListValues) {
// in case of string values
// add quotes to records?
// escape quotes in records?
} else {
const msg = {msg: 'Objects are not allowed as fields'}
const line = verbose > 0 ? {line: -1} : {}
const info = verbose > 1 ? {info: JSON.stringify(field)} : {}
err.push(Object.assign(msg, line, info))
}
} else {
const msg = {msg: 'Type not allowed as field'}
const line = verbose > 0 ? {line: -1} : {}
const info = verbose > 1 ? {info: `${field.toString()} (${typeof field})`} : {}
err.push(Object.assign(msg, line, info))
}
}
records.push(record2)
}
return {err: [], records}
}
function controlFixedLength (records) {
const err = []
const records2 = []
for (let i = 0; i < records.length; i++) {
const record = records[i]
if (keys.length === 0) keys = record
if (headerIsSet && keys.length !== record.length) {
const msg = {msg: 'Number of values does not match number of headers'}
const line = verbose > 0 ? {line: -1} : {}
const info = verbose > 1 ? {info: `values [${record.join(',')}] and headers [${keys.join(',')}]`} : {}
err.push(Object.assign(msg, line, info))
} else {
records2.push(record)
}
}
return {err, records: records2}
}
function removeWhitespaces (record) {
const record2 = []
for (let i = 0; i < record.length; i++) {
const value = record[i]
const value2 = value.replace(/^\s+|\s+$/g, '')
record2.push(value2)
}
return record2
}
function emptyToNull (record) {
const record2 = []
for (let i = 0; i < record.length; i++) {
const value = record[i]
const value2 = value === '' ? null : value
record2.push(value2)
}
return record2
}
function removeNulls (record) {
const record2 = []
for (let i = 0; i < record.length; i++) {
const value = record[i]
if (value !== null && typeof value !== 'undefined') record2.push(value)
}
return record2
}
function replaceNulls (record) {
Eif (headerIsSet) {
const record2 = []
for (let i = 0; i < keys.length; i++) {
const value = record[i]
if (value === null || typeof value === 'undefined') record2.push(_nullAs)
else record2.push(value)
}
return record2
}
return record
}
}
} |