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module.exports = {
name: 'dsv',
desc: (
'is a delimiter-separated values parser:\n\n' +
'--pdelimiter, --delimiter, -D [char]\nDelimiter used to separate values.\n\n' +
'--pquote, --quote, -Q [char]\nCharacter used to quote strings.\n\n' +
'--pescape, --escape, -C [char]\nCharacter used to escape quote in strings.\n\n' +
'--pheader, --header, -H [string]\nProvide a custom header as a JSON array string.\n\n' +
'--pskip-header, --skip-header, -S [boolean]\nDo not interpret first line as header.\n\n' +
'--pfixed-length, --fixed-length, -F [boolean]\nPost-processing #1: Controls, whether each line has the same number of values. Ignores all deviating lines while reporting errors.\n\n' +
'--pskip-empty-values, --skip-empty-values, -E [boolean]\nPost-processing #2: Skip values that are empty strings.\n\n' +
'--ptrim-whitespaces, --trim-whitespaces, -W [boolean]\nPost-processing #3: Trim whitespaces around values.\n\n' +
'--pempty-as-null, --empty-as-null, -I [boolean]\nPost-processing #4: Treat empty fields as null.\n\n' +
'--pskip-null, --skip-null, -N [boolean]\nPost-processing #5: Skip values that are null.\n\n' +
'--pmissing-as-null, --missing-as-null, -M [boolean]\nPost-processing #6: Treat missing fields (if #values < #keys) as null.\n'
),
func: dsv({}),
dsv
}
function dsv (defaults) {
return argv => {
const {
verbose,
pdelimiter, delimiter, D,
pquote, quote, Q,
pescape, escape, C,
pheader, header, H,
pskipHeader, skipHeader, S,
pfixedLength, fixedLength, F,
pskipEmptyValues, skipEmptyValues, E,
ptrimWhitespaces, trimWhitespaces, W,
pemptyAsNull, emptyAsNull, I,
pskipNull, skipNull, N,
pmissingAsNull, missingAsNull, M
} = argv
const _delimiter = pdelimiter || delimiter || D || defaults.delimiter
const _quote = pquote || quote || Q || defaults.quote
const _escape = pescape || escape || C || defaults.escape
const _header = pheader || header || H || defaults.header
const _skipHeader = pskipHeader || skipHeader || S || defaults.skipHeader || false
const _fixedLength = pfixedLength || fixedLength || F || defaults.fixedLength || false
const _skipEmptyValues = pskipEmptyValues || skipEmptyValues || E || defaults.skipEmptyValues || false
const _trimWhitespaces = ptrimWhitespaces || trimWhitespaces || W || defaults.trimWhitespaces || false
const _emptyAsNull = pemptyAsNull || emptyAsNull || I || defaults.emptyAsNull || false
const _skipNull = pskipNull || skipNull || N || defaults.skipNull || false
const _missingAsNull = pmissingAsNull || missingAsNull || M || defaults.missingAsNull || false
const missingOptions = [
handleMissingOption(_delimiter, 'pdelimiter, delimiter or D', argv),
handleMissingOption(_quote, 'pquote, quote or Q', argv),
handleMissingOption(_escape, 'pescape, escape or C', argv),
handleMissingOption(_header, 'pheader, 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, jsons: []})
let keys = JSON.parse(_header)
let keysLength = keys.length
// skipHeader | header || return type | keys | data header || headerIsSet | ignoreDataHeader | returnTypeObject
// true | [...] || JSON object | provided header | ignore || true | true | true
// true | [] || JSON array | none | ignore || true | true | false
// false | [...] || JSON object | provided header | treat as data || true | false | true
// false | [] || JSON object | data header | treat as keys || false | false | true
let headerIsSet = _skipHeader || keysLength > 0
let ignoreDataHeader = _skipHeader
const returnTypeObject = !_skipHeader || keysLength > 0
const postprocessingFs = []
if (_fixedLength) postprocessingFs.push(controlFixedLength)
if (_skipEmptyValues) postprocessingFs.push(removeEmptyValues)
if (_trimWhitespaces) postprocessingFs.push(removeWhitespaces)
if (_emptyAsNull) postprocessingFs.push(emptyToNull)
if (_skipNull) postprocessingFs.push(removeNulls)
if (_missingAsNull) postprocessingFs.push(missingToNull)
const postprocessingF = (values, line) => {
let err = []
let values2 = values
for (let i = 0; i < postprocessingFs.length; i++) {
const f = postprocessingFs[i]
const res = f(values2, line)
if (res.err.length > 0) err = err.concat(res.err)
values2 = res.values
}
return {err, values: values2}
}
return (tokens, lines) => {
let err = []
const jsons = []
const start = ignoreDataHeader ? 1 : 0
for (let i = start; i < tokens.length; i++) {
const token = tokens[i]
let values = []
let from = 0
let inQuote = false
let mayBeEscaped = false
let isEscaped = false
let valueFound = false
let hasQuotes = false
let hasEscapedQuotes = false
for (let at = 0; at < (token || '').length; at++) {
const ch = token.charAt(at)
if (inQuote) {
hasQuotes = true
if (_quote === _escape) {
if (mayBeEscaped) {
mayBeEscaped = false
if (ch === _quote) hasEscapedQuotes = true
else inQuote = false
if (ch === _delimiter) valueFound = true
} else {
if (ch === _escape) mayBeEscaped = true
else Iif (ch === _quote) inQuote = false
}
} else {
if (isEscaped) {
isEscaped = false
Eif (ch === _quote) hasEscapedQuotes = true
} else {
if (ch === _escape) isEscaped = true
else if (ch === _quote) inQuote = false
}
}
} else {
if (ch === _quote) inQuote = true
else if (ch === _delimiter) valueFound = true
}
if (valueFound || at === token.length - 1) {
let value = token.slice(from, valueFound ? at : at + 1)
valueFound = false
from = at + 1
if (hasQuotes) value = removeQuotes(value)
if (hasEscapedQuotes) value = removeEscapedQuotes(value)
values.push(value)
}
if (at === token.length - 1 && ch === _delimiter) {
values.push('')
}
}
if (token === '') values.push(token)
if (keysLength === 0 && !returnTypeObject) {
keysLength = values.length
}
const line = verbose > 0 ? lines[i] : undefined
const res = postprocessingF(values, line)
if (res.err.length > 0) err = err.concat(res.err)
values = res.values
if (values.length > 0) {
if (!headerIsSet) {
keys = values
keysLength = keys.length
headerIsSet = true
ignoreDataHeader = false
} else if (returnTypeObject) {
const json = {}
const until = Math.max(keysLength, values.length)
for (let j = 0; j < until; j++) {
const key = keys[j]
const value = values[j]
const key2 = typeof key !== 'undefined' ? key : '#' + j
const value2 = typeof value !== 'undefined' ? value : null
json[key2] = value2
}
jsons.push(json)
} else {
jsons.push(values)
}
}
}
return {err, jsons}
}
function removeQuotes (value) {
let value2 = value
const len = value.length
Eif (len > 0 && value[0] === _quote && value[len - 1] === _quote) {
value2 = value.slice(1, len - 1)
}
return value2
}
function removeEscapedQuotes (value) {
let lastCh = ''
let value2 = ''
for (let at = 0; at < value.length; at++) {
const ch = value[at]
if (lastCh === '') {
lastCh = ch
} else if (lastCh === _escape && ch === _quote) {
value2 += ch
lastCh = ''
} else {
value2 += lastCh
lastCh = ch
}
}
value2 += lastCh
return value2
}
function controlFixedLength (values, lineNo) {
if (headerIsSet && keysLength !== values.length) {
const msg = {msg: 'Number of values does not match number of headers'}
const line = verbose > 0 ? {line: lineNo} : {}
const info = verbose > 1 ? {info: `values [${values.join(',')}] and headers [${keys.join(',')}]`} : {}
return {err: [Object.assign(msg, line, info)], values: []}
} else {
return {err: [], values}
}
}
function removeWhitespaces (values) {
let values2 = []
for (let i = 0; i < values.length; i++) {
const value = values[i]
const value2 = value.replace(/^\s+|\s+$/g, '')
values2.push(value2)
}
return {err: [], values: values2}
}
function removeEmptyValues (values) {
const values2 = []
for (let i = 0; i < values.length; i++) {
const value = values[i]
if (value !== '') values2.push(value)
}
return {err: [], values: values2}
}
function emptyToNull (values) {
const values2 = []
for (let i = 0; i < values.length; i++) {
const value = values[i]
values2.push(value === '' ? null : value)
}
return {err: [], values: values2}
}
function removeNulls (values) {
const values2 = []
for (let i = 0; i < values.length; i++) {
const value = values[i]
Eif (value !== null) values2.push(value)
}
return {err: [], values: values2}
}
function missingToNull (values) {
if (headerIsSet) {
const len = values.length
const values2 = []
for (let i = 0; i < keysLength; i++) {
const value = i < len ? values[i] : null
values2.push(value)
}
return {err: [], values: values2}
} else {
return {err: [], values}
}
}
}
} |