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feat: adding linter for commits

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2021-11-22 09:39:27 -06:00
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Copyright (c) 2014-2018, Matteo Collina <hello@matteocollina.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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# Split2(matcher, mapper, options)
![ci](https://github.com/mcollina/split2/workflows/ci/badge.svg)
Break up a stream and reassemble it so that each line is a chunk.
`split2` is inspired by [@dominictarr](https://github.com/dominictarr) [`split`](https://github.com/dominictarr/split) module,
and it is totally API compatible with it.
However, it is based on Node.js core [`Transform`](https://nodejs.org/api/stream.html#stream_new_stream_transform_options) via [`readable-stream`](https://github.com/nodejs/readable-stream)
`matcher` may be a `String`, or a `RegExp`. Example, read every line in a file ...
``` js
fs.createReadStream(file)
.pipe(split2())
.on('data', function (line) {
//each chunk now is a separate line!
})
```
`split` takes the same arguments as `string.split` except it defaults to '/\r?\n/', and the optional `limit` paremeter is ignored.
[String#split](https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/String/split)
`split` takes an optional options object on it's third argument, which
is directly passed as a
[Transform](https://nodejs.org/api/stream.html#stream_new_stream_transform_options)
option.
Additionally, the `.maxLength` and `.skipOverflow` options are implemented, which set limits on the internal
buffer size and the stream's behavior when the limit is exceeded. There is no limit unless `maxLength` is set. When
the internal buffer size exceeds `maxLength`, the stream emits an error by default. You may also set `skipOverflow` to
true to suppress the error and instead skip past any lines that cause the internal buffer to exceed `maxLength`.
Calling `.destroy` will make the stream emit `close`. Use this to perform cleanup logic
``` js
var splitFile = function(filename) {
var file = fs.createReadStream(filename)
return file
.pipe(split2())
.on('close', function() {
// destroy the file stream in case the split stream was destroyed
file.destroy()
})
}
var stream = splitFile('my-file.txt')
stream.destroy() // will destroy the input file stream
```
# NDJ - Newline Delimited Json
`split2` accepts a function which transforms each line.
``` js
fs.createReadStream(file)
.pipe(split2(JSON.parse))
.on('data', function (obj) {
//each chunk now is a js object
})
.on("error", function(error) => {
//handling parsing errors
})
```
However, in [@dominictarr](https://github.com/dominictarr) [`split`](https://github.com/dominictarr/split) the mapper
is wrapped in a try-catch, while here it is not: if your parsing logic can throw, wrap it yourself. Otherwise, you can also use the stream error handling when mapper function throw.
# Benchmark
```bash
$ node bench.js
benchSplit*10000: 1484.983ms
benchBinarySplit*10000: 1484.080ms
benchSplit*10000: 1407.334ms
benchBinarySplit*10000: 1500.281ms
```
Benchmark taken on Node 8.11.3, on a Macbook i5 2018.
# License
Copyright (c) 2014-2018, Matteo Collina <hello@matteocollina.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

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'use strict'
var split = require('./')
var bench = require('fastbench')
var binarySplit = require('binary-split')
var fs = require('fs')
function benchSplit (cb) {
fs.createReadStream('package.json')
.pipe(split())
.on('end', cb)
.resume()
}
function benchBinarySplit (cb) {
fs.createReadStream('package.json')
.pipe(binarySplit())
.on('end', cb)
.resume()
}
var run = bench([
benchSplit,
benchBinarySplit
], 10000)
run(run)

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/*
Copyright (c) 2014-2018, Matteo Collina <hello@matteocollina.com>
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
'use strict'
const { Transform } = require('readable-stream')
const { StringDecoder } = require('string_decoder')
const kLast = Symbol('last')
const kDecoder = Symbol('decoder')
function transform (chunk, enc, cb) {
var list
if (this.overflow) { // Line buffer is full. Skip to start of next line.
var buf = this[kDecoder].write(chunk)
list = buf.split(this.matcher)
if (list.length === 1) return cb() // Line ending not found. Discard entire chunk.
// Line ending found. Discard trailing fragment of previous line and reset overflow state.
list.shift()
this.overflow = false
} else {
this[kLast] += this[kDecoder].write(chunk)
list = this[kLast].split(this.matcher)
}
this[kLast] = list.pop()
for (var i = 0; i < list.length; i++) {
try {
push(this, this.mapper(list[i]))
} catch (error) {
return cb(error)
}
}
this.overflow = this[kLast].length > this.maxLength
if (this.overflow && !this.skipOverflow) return cb(new Error('maximum buffer reached'))
cb()
}
function flush (cb) {
// forward any gibberish left in there
this[kLast] += this[kDecoder].end()
if (this[kLast]) {
try {
push(this, this.mapper(this[kLast]))
} catch (error) {
return cb(error)
}
}
cb()
}
function push (self, val) {
if (val !== undefined) {
self.push(val)
}
}
function noop (incoming) {
return incoming
}
function split (matcher, mapper, options) {
// Set defaults for any arguments not supplied.
matcher = matcher || /\r?\n/
mapper = mapper || noop
options = options || {}
// Test arguments explicitly.
switch (arguments.length) {
case 1:
// If mapper is only argument.
if (typeof matcher === 'function') {
mapper = matcher
matcher = /\r?\n/
// If options is only argument.
} else if (typeof matcher === 'object' && !(matcher instanceof RegExp)) {
options = matcher
matcher = /\r?\n/
}
break
case 2:
// If mapper and options are arguments.
if (typeof matcher === 'function') {
options = mapper
mapper = matcher
matcher = /\r?\n/
// If matcher and options are arguments.
} else if (typeof mapper === 'object') {
options = mapper
mapper = noop
}
}
options = Object.assign({}, options)
options.transform = transform
options.flush = flush
options.readableObjectMode = true
const stream = new Transform(options)
stream[kLast] = ''
stream[kDecoder] = new StringDecoder('utf8')
stream.matcher = matcher
stream.mapper = mapper
stream.maxLength = options.maxLength
stream.skipOverflow = options.skipOverflow
stream.overflow = false
return stream
}
module.exports = split

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{
"name": "split2",
"version": "3.2.2",
"description": "split a Text Stream into a Line Stream, using Stream 3",
"main": "index.js",
"scripts": {
"lint": "standard --verbose",
"unit": "nyc --lines 100 --branches 100 --functions 100 --check-coverage --reporter=text tape test.js",
"coverage": "nyc --reporter=html --reporter=cobertura --reporter=text tape test/test.js",
"test:report": "npm run lint && npm run unit:report",
"test": "npm run lint && npm run unit",
"legacy": "tape test.js"
},
"pre-commit": [
"test"
],
"website": "https://github.com/mcollina/split2",
"repository": {
"type": "git",
"url": "https://github.com/mcollina/split2.git"
},
"bugs": {
"url": "http://github.com/mcollina/split2/issues"
},
"author": "Matteo Collina <hello@matteocollina.com>",
"license": "ISC",
"devDependencies": {
"binary-split": "^1.0.3",
"callback-stream": "^1.1.0",
"fastbench": "^1.0.0",
"nyc": "^15.0.1",
"pre-commit": "^1.1.2",
"safe-buffer": "^5.1.1",
"standard": "^14.0.0",
"tape": "^5.0.0"
},
"dependencies": {
"readable-stream": "^3.0.0"
}
}

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'use strict'
var test = require('tape')
var split = require('./')
var callback = require('callback-stream')
var Buffer = require('safe-buffer').Buffer
var strcb = callback.bind(null, { decodeStrings: false })
var objcb = callback.bind(null, { objectMode: true })
test('split two lines on end', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end('hello\nworld')
})
test('split two lines on two writes', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.write('hello')
input.write('\nworld')
input.end()
})
test('split four lines on three writes', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world', 'bye', 'world'])
}))
input.write('hello\nwor')
input.write('ld\nbye\nwo')
input.write('rld')
input.end()
})
test('accumulate multiple writes', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['helloworld'])
}))
input.write('hello')
input.write('world')
input.end()
})
test('split using a custom string matcher', function (t) {
t.plan(2)
var input = split('~')
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end('hello~world')
})
test('split using a custom regexp matcher', function (t) {
t.plan(2)
var input = split(/~/)
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end('hello~world')
})
test('support an option argument', function (t) {
t.plan(2)
var input = split({ highWaterMark: 2 })
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end('hello\nworld')
})
test('support a mapper function', function (t) {
t.plan(2)
var a = { a: '42' }
var b = { b: '24' }
var input = split(JSON.parse)
input.pipe(objcb(function (err, list) {
t.error(err)
t.deepEqual(list, [a, b])
}))
input.write(JSON.stringify(a))
input.write('\n')
input.end(JSON.stringify(b))
})
test('split lines windows-style', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end('hello\r\nworld')
})
test('splits a buffer', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end(Buffer.from('hello\nworld'))
})
test('do not end on undefined', function (t) {
t.plan(2)
var input = split(function (line) { })
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, [])
}))
input.end(Buffer.from('hello\nworld'))
})
test('has destroy method', function (t) {
t.plan(1)
var input = split(function (line) { })
input.on('close', function () {
t.ok(true, 'close emitted')
t.end()
})
input.destroy()
})
test('support custom matcher and mapper', function (t) {
t.plan(4)
var a = { a: '42' }
var b = { b: '24' }
var input = split('~', JSON.parse)
t.equal(input.matcher, '~')
t.equal(typeof input.mapper, 'function')
input.pipe(objcb(function (err, list) {
t.notOk(err, 'no errors')
t.deepEqual(list, [a, b])
}))
input.write(JSON.stringify(a))
input.write('~')
input.end(JSON.stringify(b))
})
test('support custom matcher and options', function (t) {
t.plan(6)
var input = split('~', { highWaterMark: 1024 })
t.equal(input.matcher, '~')
t.equal(typeof input.mapper, 'function')
t.equal(input._readableState.highWaterMark, 1024)
t.equal(input._writableState.highWaterMark, 1024)
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.end('hello~world')
})
test('support mapper and options', function (t) {
t.plan(6)
var a = { a: '42' }
var b = { b: '24' }
var input = split(JSON.parse, { highWaterMark: 1024 })
t.ok(input.matcher instanceof RegExp, 'matcher is RegExp')
t.equal(typeof input.mapper, 'function')
t.equal(input._readableState.highWaterMark, 1024)
t.equal(input._writableState.highWaterMark, 1024)
input.pipe(objcb(function (err, list) {
t.error(err)
t.deepEqual(list, [a, b])
}))
input.write(JSON.stringify(a))
input.write('\n')
input.end(JSON.stringify(b))
})
test('split utf8 chars', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['烫烫烫', '锟斤拷'])
}))
var buf = Buffer.from('烫烫烫\r\n锟斤拷', 'utf8')
for (var i = 0; i < buf.length; ++i) {
input.write(buf.slice(i, i + 1))
}
input.end()
})
test('split utf8 chars 2by2', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['烫烫烫', '烫烫烫'])
}))
var str = '烫烫烫\r\n烫烫烫'
var buf = Buffer.from(str, 'utf8')
for (var i = 0; i < buf.length; i += 2) {
input.write(buf.slice(i, i + 2))
}
input.end()
})
test('split lines when the \n comes at the end of a chunk', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['hello', 'world'])
}))
input.write('hello\n')
input.end('world')
})
test('truncated utf-8 char', function (t) {
t.plan(2)
var input = split()
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['烫' + Buffer.from('e7', 'hex').toString()])
}))
var str = '烫烫'
var buf = Buffer.from(str, 'utf8')
input.write(buf.slice(0, 3))
input.end(buf.slice(3, 4))
})
test('maximum buffer limit', function (t) {
t.plan(1)
var input = split({ maxLength: 2 })
input.pipe(strcb(function (err, list) {
t.ok(err)
}))
input.write('hey')
})
test('readable highWaterMark', function (t) {
var input = split()
t.equal(input._readableState.highWaterMark, 16)
t.end()
})
test('maxLength < chunk size', function (t) {
t.plan(2)
var input = split({ maxLength: 2 })
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['a', 'b'])
}))
input.end('a\nb')
})
test('maximum buffer limit w/skip', function (t) {
t.plan(2)
var input = split({ maxLength: 2, skipOverflow: true })
input.pipe(strcb(function (err, list) {
t.error(err)
t.deepEqual(list, ['a', 'b', 'c'])
}))
input.write('a\n123')
input.write('456')
input.write('789\nb\nc')
input.end()
})
test("don't modify the options object", function (t) {
t.plan(2)
var options = {}
var input = split(options)
input.pipe(strcb(function (err, list) {
t.error(err)
t.same(options, {})
}))
input.end()
})
test('mapper throws flush', function (t) {
t.plan(1)
var error = new Error()
var input = split(function () {
throw error
})
input.on('error', (err, list) => {
t.same(err, error)
})
input.end('hello')
})
test('mapper throws on transform', function (t) {
t.plan(2)
var error = new Error()
var input = split(function (l) {
throw error
})
input.on('error', (err) => {
t.same(err, error)
})
input.write('a')
input.write('\n')
input.end('b')
})