├── .gitignore ├── LICENSE ├── README.md ├── lib └── byline.js ├── package.json └── test ├── CRLF.txt ├── empty.txt ├── rfc.txt ├── rfc_huge.txt └── tests.js /.gitignore: -------------------------------------------------------------------------------- 1 | .DS_Store 2 | node_modules 3 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | node-byline (C) 2011-2015 John Hewson 2 | 3 | Permission is hereby granted, free of charge, to any person obtaining a copy 4 | of this software and associated documentation files (the "Software"), to 5 | deal in the Software without restriction, including without limitation the 6 | rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 7 | sell copies of the Software, and to permit persons to whom the Software is 8 | furnished to do so, subject to the following conditions: 9 | 10 | The above copyright notice and this permission notice shall be included in 11 | all copies or substantial portions of the Software. 12 | 13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 18 | FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 19 | IN THE SOFTWARE. -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # byline — buffered stream for reading lines 2 | 3 | ![npm package](https://nodei.co/npm/byline.png?downloads=true&downloadRank=true) 4 | 5 | `byline` is a simple module providing a `LineStream`. 6 | 7 | - node v0.10 `streams2` (transform stream) 8 | - supports `pipe` 9 | - supports both UNIX and Windows line endings 10 | - supports [Unicode UTS #18 line boundaries](http://www.unicode.org/reports/tr18/#Line_Boundaries) 11 | - can wrap any readable stream 12 | - can be used as a readable-writable "through-stream" (transform stream) 13 | - super-simple: `stream = byline(stream);` 14 | 15 | ## Install 16 | 17 | npm install byline 18 | 19 | or from source: 20 | 21 | git clone git://github.com/jahewson/node-byline.git 22 | cd node-byline 23 | npm link 24 | 25 | # Convenience API 26 | 27 | The `byline` module can be used as a function to quickly wrap a readable stream: 28 | 29 | ```javascript 30 | var fs = require('fs'), 31 | byline = require('byline'); 32 | 33 | var stream = byline(fs.createReadStream('sample.txt', { encoding: 'utf8' })); 34 | ``` 35 | 36 | The `data` event then emits lines: 37 | 38 | ```javascript 39 | stream.on('data', function(line) { 40 | console.log(line); 41 | }); 42 | ``` 43 | 44 | # Standard API 45 | 46 | You just need to add one line to wrap your readable `Stream` with a `LineStream`. 47 | 48 | ```javascript 49 | var fs = require('fs'), 50 | byline = require('byline'); 51 | 52 | var stream = fs.createReadStream('sample.txt'); 53 | stream = byline.createStream(stream); 54 | 55 | stream.on('data', function(line) { 56 | console.log(line); 57 | }); 58 | ``` 59 | 60 | # Piping 61 | 62 | `byline` supports `pipe` (though it strips the line endings, of course). 63 | 64 | ```javascript 65 | var stream = fs.createReadStream('sample.txt'); 66 | stream = byline.createStream(stream); 67 | stream.pipe(fs.createWriteStream('nolines.txt')); 68 | ``` 69 | 70 | Alternatively, you can create a readable/writable "through-stream" which doesn't wrap any specific 71 | stream: 72 | 73 | ```javascript 74 | var stream = fs.createReadStream('sample.txt'); 75 | stream = byline.createStream(stream); 76 | stream.pipe(fs.createWriteStream('nolines.txt')); 77 | 78 | var input = fs.createReadStream('LICENSE'); 79 | var lineStream = byline.createStream(); 80 | input.pipe(lineStream); 81 | 82 | var output = fs.createWriteStream('test.txt'); 83 | lineStream.pipe(output); 84 | ``` 85 | 86 | # Streams2 API 87 | 88 | Node v0.10 added a new streams2 API. This allows the stream to be used in non-flowing mode and is 89 | preferred over the legacy pause() and resume() methods. 90 | 91 | ```javascript 92 | var stream = fs.createReadStream('sample.txt'); 93 | stream = byline.createStream(stream); 94 | 95 | stream.on('readable', function() { 96 | var line; 97 | while (null !== (line = stream.read())) { 98 | console.log(line); 99 | } 100 | }); 101 | ``` 102 | 103 | # Transform Stream 104 | 105 | The `byline` transform stream can be directly manipulated like so: 106 | 107 | ```javascript 108 | var LineStream = require('byline').LineStream; 109 | 110 | var input = fs.createReadStream('sample.txt'); 111 | var output = fs.createWriteStream('nolines.txt'); 112 | 113 | var lineStream = new LineStream(); 114 | input.pipe(lineStream); 115 | lineStream.pipe(output); 116 | 117 | ``` 118 | 119 | # Empty Lines 120 | 121 | By default byline skips empty lines, if you want to keep them, pass the `keepEmptyLines` option in 122 | the call to `byline.createStream(stream, options)` or `byline(stream, options)`. 123 | 124 | # Tests 125 | 126 | npm test 127 | 128 | # v0.8 129 | 130 | If you want to use `node-byline` with node v0.8 then you can use the 2.1.x series. Simply use the 131 | following in your `package.json`: 132 | 133 | ```javascript 134 | "dependencies": { 135 | "byline": ">=2.1.0 <3.0.0" 136 | }, 137 | ``` 138 | 139 | # Simple 140 | Unlike other modules (of which there are many), `byline` contains no: 141 | 142 | - monkeypatching 143 | - dependencies 144 | - non-standard 'line' events which break `pipe` 145 | - limitations to only file streams 146 | - CoffeeScript 147 | - unnecessary code 148 | -------------------------------------------------------------------------------- /lib/byline.js: -------------------------------------------------------------------------------- 1 | // Copyright (C) 2011-2015 John Hewson 2 | // 3 | // Permission is hereby granted, free of charge, to any person obtaining a copy 4 | // of this software and associated documentation files (the "Software"), to 5 | // deal in the Software without restriction, including without limitation the 6 | // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 7 | // sell copies of the Software, and to permit persons to whom the Software is 8 | // furnished to do so, subject to the following conditions: 9 | // 10 | // The above copyright notice and this permission notice shall be included in 11 | // all copies or substantial portions of the Software. 12 | // 13 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 18 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 19 | // IN THE SOFTWARE. 20 | 21 | var stream = require('stream'), 22 | util = require('util'), 23 | timers = require('timers'); 24 | 25 | // convinience API 26 | module.exports = function(readStream, options) { 27 | return module.exports.createStream(readStream, options); 28 | }; 29 | 30 | // basic API 31 | module.exports.createStream = function(readStream, options) { 32 | if (readStream) { 33 | return createLineStream(readStream, options); 34 | } else { 35 | return new LineStream(options); 36 | } 37 | }; 38 | 39 | // deprecated API 40 | module.exports.createLineStream = function(readStream) { 41 | console.log('WARNING: byline#createLineStream is deprecated and will be removed soon'); 42 | return createLineStream(readStream); 43 | }; 44 | 45 | function createLineStream(readStream, options) { 46 | if (!readStream) { 47 | throw new Error('expected readStream'); 48 | } 49 | if (!readStream.readable) { 50 | throw new Error('readStream must be readable'); 51 | } 52 | var ls = new LineStream(options); 53 | readStream.pipe(ls); 54 | return ls; 55 | } 56 | 57 | // 58 | // using the new node v0.10 "streams2" API 59 | // 60 | 61 | module.exports.LineStream = LineStream; 62 | 63 | function LineStream(options) { 64 | stream.Transform.call(this, options); 65 | options = options || {}; 66 | 67 | // use objectMode to stop the output from being buffered 68 | // which re-concatanates the lines, just without newlines. 69 | this._readableState.objectMode = true; 70 | this._lineBuffer = []; 71 | this._keepEmptyLines = options.keepEmptyLines || false; 72 | this._lastChunkEndedWithCR = false; 73 | 74 | // take the source's encoding if we don't have one 75 | var self = this; 76 | this.on('pipe', function(src) { 77 | if (!self.encoding) { 78 | // but we can't do this for old-style streams 79 | if (src instanceof stream.Readable) { 80 | self.encoding = src._readableState.encoding; 81 | } 82 | } 83 | }); 84 | } 85 | util.inherits(LineStream, stream.Transform); 86 | 87 | LineStream.prototype._transform = function(chunk, encoding, done) { 88 | // decode binary chunks as UTF-8 89 | encoding = encoding || 'utf8'; 90 | 91 | if (Buffer.isBuffer(chunk)) { 92 | if (encoding == 'buffer') { 93 | chunk = chunk.toString(); // utf8 94 | encoding = 'utf8'; 95 | } 96 | else { 97 | chunk = chunk.toString(encoding); 98 | } 99 | } 100 | this._chunkEncoding = encoding; 101 | 102 | // see: http://www.unicode.org/reports/tr18/#Line_Boundaries 103 | var lines = chunk.split(/\r\n|[\n\v\f\r\x85\u2028\u2029]/g); 104 | 105 | // don't split CRLF which spans chunks 106 | if (this._lastChunkEndedWithCR && chunk[0] == '\n') { 107 | lines.shift(); 108 | } 109 | 110 | if (this._lineBuffer.length > 0) { 111 | this._lineBuffer[this._lineBuffer.length - 1] += lines[0]; 112 | lines.shift(); 113 | } 114 | 115 | this._lastChunkEndedWithCR = chunk[chunk.length - 1] == '\r'; 116 | this._lineBuffer = this._lineBuffer.concat(lines); 117 | this._pushBuffer(encoding, 1, done); 118 | }; 119 | 120 | LineStream.prototype._pushBuffer = function(encoding, keep, done) { 121 | // always buffer the last (possibly partial) line 122 | while (this._lineBuffer.length > keep) { 123 | var line = this._lineBuffer.shift(); 124 | // skip empty lines 125 | if (this._keepEmptyLines || line.length > 0 ) { 126 | if (!this.push(this._reencode(line, encoding))) { 127 | // when the high-water mark is reached, defer pushes until the next tick 128 | var self = this; 129 | timers.setImmediate(function() { 130 | self._pushBuffer(encoding, keep, done); 131 | }); 132 | return; 133 | } 134 | } 135 | } 136 | done(); 137 | }; 138 | 139 | LineStream.prototype._flush = function(done) { 140 | this._pushBuffer(this._chunkEncoding, 0, done); 141 | }; 142 | 143 | // see Readable::push 144 | LineStream.prototype._reencode = function(line, chunkEncoding) { 145 | if (this.encoding && this.encoding != chunkEncoding) { 146 | return new Buffer(line, chunkEncoding).toString(this.encoding); 147 | } 148 | else if (this.encoding) { 149 | // this should be the most common case, i.e. we're using an encoded source stream 150 | return line; 151 | } 152 | else { 153 | return new Buffer(line, chunkEncoding); 154 | } 155 | }; 156 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "byline", 3 | "description": "simple line-by-line stream reader", 4 | "homepage": "https://github.com/jahewson/node-byline", 5 | "bugs": { 6 | "url": "https://github.com/jahewson/node-byline/issues" 7 | }, 8 | "version": "5.0.0", 9 | "author": "John Hewson", 10 | "license": "MIT", 11 | "repository": { 12 | "type": "git", 13 | "url": "https://github.com/jahewson/node-byline" 14 | }, 15 | "engines": { 16 | "node": ">=0.10.0" 17 | }, 18 | "main": "./lib/byline.js", 19 | "files": [ 20 | "lib" 21 | ], 22 | "devDependencies": { 23 | "mocha": "~2.1.0", 24 | "request": "~2.27.0" 25 | }, 26 | "scripts": { 27 | "test": "mocha -R spec --timeout 60000" 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /test/CRLF.txt: -------------------------------------------------------------------------------- 1 | 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2 | AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -------------------------------------------------------------------------------- /test/empty.txt: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | Line 6 -------------------------------------------------------------------------------- /test/tests.js: -------------------------------------------------------------------------------- 1 | // Copyright (C) 2013-2015 John Hewson 2 | // 3 | // Permission is hereby granted, free of charge, to any person obtaining a copy 4 | // of this software and associated documentation files (the "Software"), to 5 | // deal in the Software without restriction, including without limitation the 6 | // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 7 | // sell copies of the Software, and to permit persons to whom the Software is 8 | // furnished to do so, subject to the following conditions: 9 | // 10 | // The above copyright notice and this permission notice shall be included in 11 | // all copies or substantial portions of the Software. 12 | // 13 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 14 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 15 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 16 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 17 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 18 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 19 | // IN THE SOFTWARE. 20 | 21 | var assert = require("assert"), 22 | fs = require('fs'), 23 | byline = require('../lib/byline'), 24 | request = require('request'); 25 | 26 | var regEx = /\r\n|[\n\v\f\r\x85\u2028\u2029]/g; 27 | 28 | describe('byline', function() { 29 | 30 | it('should pipe a small file', function(done) { 31 | var input = fs.createReadStream('LICENSE'); 32 | var lineStream = byline(input); // convinience API 33 | var output = fs.createWriteStream('test.txt'); 34 | lineStream.pipe(output); 35 | output.on('close', function() { 36 | var out = fs.readFileSync('test.txt', 'utf8'); 37 | var in_ = fs.readFileSync('LICENSE', 'utf8').replace(/\n/g, ''); 38 | assert.equal(in_, out); 39 | fs.unlinkSync('test.txt'); 40 | done(); 41 | }); 42 | }); 43 | 44 | it('should work with streams2 API', function(done) { 45 | var stream = fs.createReadStream('LICENSE'); 46 | stream = byline.createStream(stream); 47 | 48 | stream.on('readable', function() { 49 | var line; 50 | while (null !== (line = stream.read())) { 51 | } 52 | }); 53 | 54 | stream.on('end', function() { 55 | done(); 56 | }); 57 | }); 58 | 59 | it('should ignore empty lines by default', function(done) { 60 | var input = fs.createReadStream('test/empty.txt'); 61 | var lineStream = byline(input); 62 | lineStream.setEncoding('utf8'); 63 | 64 | var lines1 = []; 65 | lineStream.on('data', function(line) { 66 | lines1.push(line); 67 | }); 68 | 69 | lineStream.on('end', function() { 70 | var lines2 = fs.readFileSync('test/empty.txt', 'utf8').split(regEx); 71 | lines2 = lines2.filter(function(line) { 72 | return line.length > 0; 73 | }); 74 | assert.deepEqual(lines2, lines1); 75 | done(); 76 | }); 77 | }); 78 | 79 | it('should keep empty lines when keepEmptyLines is true', function(done) { 80 | var input = fs.createReadStream('test/empty.txt'); 81 | var lineStream = byline(input, { keepEmptyLines: true }); 82 | lineStream.setEncoding('utf8'); 83 | 84 | var lines = []; 85 | lineStream.on('data', function(line) { 86 | lines.push(line); 87 | }); 88 | 89 | lineStream.on('end', function() { 90 | assert.deepEqual([ '', '', '', '', '', 'Line 6' ], lines); 91 | done(); 92 | }); 93 | }); 94 | 95 | it('should not split a CRLF which spans two chunks', function(done) { 96 | var input = fs.createReadStream('test/CRLF.txt'); 97 | var lineStream = byline(input, { keepEmptyLines: true }); 98 | lineStream.setEncoding('utf8'); 99 | 100 | var lines = []; 101 | lineStream.on('data', function(line) { 102 | lines.push(line); 103 | }); 104 | 105 | lineStream.on('end', function() { 106 | assert.equal(2, lines.length); 107 | done(); 108 | }); 109 | }); 110 | 111 | it('should read a large file', function(done) { 112 | readFile('test/rfc.txt', done); 113 | }); 114 | 115 | it('should read a huge file', function(done) { 116 | // Readable highWaterMark is 16384, so we test a file with more lines than this 117 | readFile('test/rfc_huge.txt', done); 118 | }); 119 | 120 | function readFile(filename, done) { 121 | var input = fs.createReadStream(filename); 122 | var lineStream = byline(input); 123 | lineStream.setEncoding('utf8'); 124 | 125 | var lines2 = fs.readFileSync(filename, 'utf8').split(regEx); 126 | lines2 = lines2.filter(function(line) { 127 | return line.length > 0; 128 | }); 129 | 130 | var lines1 = []; 131 | var i = 0; 132 | lineStream.on('data', function(line) { 133 | lines1.push(line); 134 | if (line != lines2[i]) { 135 | console.log('EXPECTED:', lines2[i]); 136 | console.log(' GOT:', line); 137 | assert.fail(null, null, 'difference at line ' + (i + 1)); 138 | } 139 | i++; 140 | }); 141 | 142 | lineStream.on('end', function() { 143 | assert.equal(lines2.length, lines1.length); 144 | assert.deepEqual(lines2, lines1); 145 | done(); 146 | }); 147 | } 148 | 149 | it('should handle encodings like fs', function(done) { 150 | areStreamsEqualTypes(undefined, function() { 151 | areStreamsEqualTypes({ encoding: 'utf8' }, function() { 152 | done(); 153 | }); 154 | }); 155 | }); 156 | 157 | it('should work with old-style streams', function(done) { 158 | var stream = byline(request.get('http://www.google.com')); 159 | stream.on('data',function (data) { 160 | }); 161 | stream.on('end',function () { 162 | done(); 163 | }); 164 | }); 165 | 166 | it('should pause() and resume() with a huge file', function(done) { 167 | var input = fs.createReadStream('test/rfc_huge.txt'); 168 | var lineStream = byline(input); 169 | lineStream.setEncoding('utf8'); 170 | 171 | var lines2 = fs.readFileSync('test/rfc_huge.txt', 'utf8').split(regEx); 172 | lines2 = lines2.filter(function(line) { 173 | return line.length > 0; 174 | }); 175 | 176 | var lines1 = []; 177 | var i = 0; 178 | lineStream.on('data', function(line) { 179 | lines1.push(line); 180 | if (line != lines2[i]) { 181 | console.log('EXPECTED:', lines2[i]); 182 | console.log(' GOT:', line); 183 | assert.fail(null, null, 'difference at line ' + (i + 1)); 184 | } 185 | i++; 186 | 187 | // pause/resume 188 | lineStream.pause(); 189 | setTimeout(function() { 190 | lineStream.resume(); 191 | }, 0); 192 | }); 193 | 194 | lineStream.on('end', function() { 195 | assert.equal(lines2.length, lines1.length); 196 | assert.deepEqual(lines2, lines1); 197 | done(); 198 | }); 199 | }); 200 | 201 | function areStreamsEqualTypes(options, callback) { 202 | var fsStream = fs.createReadStream('LICENSE', options); 203 | var lineStream = byline(fs.createReadStream('LICENSE', options)); 204 | fsStream.on('data', function(data1) { 205 | lineStream.on('data', function(data2) { 206 | assert.equal(Buffer.isBuffer(data1), Buffer.isBuffer(data2)); 207 | }); 208 | lineStream.on('end', function() { 209 | callback(); 210 | }); 211 | }); 212 | } 213 | 214 | }); 215 | --------------------------------------------------------------------------------