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How to use TransformStream method in wpt

Best JavaScript code snippet using wpt

transform-stream.js

Source:transform-stream.js

...143    return false;144  }145  return true;146}147function IsTransformStream(x) {148  if (!typeIsObject(x)) {149    return false;150  }151  if (!Object.prototype.hasOwnProperty.call(x, '_transformStreamController')) {152    return false;153  }154  return true;155}156class TransformStreamSink {157  constructor(transformStream, startPromise) {158    this._transformStream = transformStream;159    this._startPromise = startPromise;160  }161  start(c) {162    const transformStream = this._transformStream;163    transformStream._writableController = c;164    return this._startPromise.then(() => TransformStreamReadableReadyPromise(transformStream));165  }166  write(chunk) {167    // console.log('TransformStreamSink.write()');168    const transformStream = this._transformStream;169    return TransformStreamTransform(transformStream, chunk);170  }171  abort() {172    const transformStream = this._transformStream;173    transformStream._writableDone = true;174    TransformStreamErrorInternal(transformStream, new TypeError('Writable side aborted'));175  }176  close() {177    // console.log('TransformStreamSink.close()');178    const transformStream = this._transformStream;179    assert(transformStream._transforming === false);180    transformStream._writableDone = true;181    const flushPromise = PromiseInvokeOrNoop(transformStream._transformer,182                         'flush', [transformStream._transformStreamController]);183    // Return a promise that is fulfilled with undefined on success.184    return flushPromise.then(() => {185      if (transformStream._errored === true) {186        return Promise.reject(transformStream._storedError);187      }188      if (transformStream._readableClosed === false) {189        TransformStreamCloseReadableInternal(transformStream);190      }191      return Promise.resolve();192    }).catch(r => {193      TransformStreamErrorIfNeeded(transformStream, r);194      return Promise.reject(transformStream._storedError);195    });196  }197}198class TransformStreamSource {199  constructor(transformStream, startPromise) {200    this._transformStream = transformStream;201    this._startPromise = startPromise;202  }203  start(c) {204    const transformStream = this._transformStream;205    transformStream._readableController = c;206    return this._startPromise.then(() => {207      // Prevent the first pull() call until there is backpressure.208      assert(transformStream._backpressureChangePromise !== undefined,209             '_backpressureChangePromise should have been initialized');210      if (transformStream._backpressure === true) {211        return Promise.resolve();212      }213      assert(transformStream._backpressure === false, '_backpressure should have been initialized');214      return transformStream._backpressureChangePromise;215    });216  }217  pull() {218    // console.log('TransformStreamSource.pull()');219    const transformStream = this._transformStream;220    // Invariant. Enforced by the promises returned by start() and pull().221    assert(transformStream._backpressure === true, 'pull() should be never called while _backpressure is false');222    assert(transformStream._backpressureChangePromise !== undefined,223           '_backpressureChangePromise should have been initialized');224    TransformStreamSetBackpressure(transformStream, false);225    // Prevent the next pull() call until there is backpressure.226    return transformStream._backpressureChangePromise;227  }228  cancel() {229    const transformStream = this._transformStream;230    transformStream._readableClosed = true;231    TransformStreamErrorInternal(transformStream, new TypeError('Readable side canceled'));232  }233}234class TransformStreamDefaultController {235  constructor(transformStream) {236    if (IsTransformStream(transformStream) === false) {237      throw new TypeError('TransformStreamDefaultController can only be ' +238                          'constructed with a TransformStream instance');239    }240    if (transformStream._transformStreamController !== undefined) {241      throw new TypeError('TransformStreamDefaultController instances can ' +242                          'only be created by the TransformStream constructor');243    }244    this._controlledTransformStream = transformStream;245  }246  get desiredSize() {247    if (IsTransformStreamDefaultController(this) === false) {248      throw defaultControllerBrandCheckException('desiredSize');249    }250    const transformStream = this._controlledTransformStream;251    const readableController = transformStream._readableController;252    return ReadableStreamDefaultControllerGetDesiredSize(readableController);253  }254  enqueue(chunk) {255    if (IsTransformStreamDefaultController(this) === false) {256      throw defaultControllerBrandCheckException('enqueue');257    }258    TransformStreamEnqueueToReadable(this._controlledTransformStream, chunk);259  }260  close() {261    if (IsTransformStreamDefaultController(this) === false) {262      throw defaultControllerBrandCheckException('close');263    }264    TransformStreamCloseReadable(this._controlledTransformStream);265  }266  error(reason) {267    if (IsTransformStreamDefaultController(this) === false) {268      throw defaultControllerBrandCheckException('error');269    }270    TransformStreamError(this._controlledTransformStream, reason);271  }272}273class TransformStream {274  constructor(transformer = {}) {275    this._transformer = transformer;276    const { readableStrategy, writableStrategy } = transformer;277    this._transforming = false;278    this._errored = false;279    this._storedError = undefined;280    this._writableController = undefined;281    this._readableController = undefined;282    this._transformStreamController = undefined;283    this._writableDone = false;284    this._readableClosed = false;285    this._backpressure = undefined;286    this._backpressureChangePromise = undefined;287    this._backpressureChangePromise_resolve = undefined;288    this._transformStreamController = new TransformStreamDefaultController(this);289    let startPromise_resolve;290    const startPromise = new Promise(resolve => {291      startPromise_resolve = resolve;292    });293    const source = new TransformStreamSource(this, startPromise);294    this._readable = new ReadableStream(source, readableStrategy);295    const sink = new TransformStreamSink(this, startPromise);296    this._writable = new WritableStream(sink, writableStrategy);297    assert(this._writableController !== undefined);298    assert(this._readableController !== undefined);299    const desiredSize = ReadableStreamDefaultControllerGetDesiredSize(this._readableController);300    // Set _backpressure based on desiredSize. As there is no read() at this point, we can just interpret301    // desiredSize being non-positive as backpressure.302    TransformStreamSetBackpressure(this, desiredSize <= 0);303    const transformStream = this;304    const startResult = InvokeOrNoop(transformer, 'start',305                          [transformStream._transformStreamController]);306    startPromise_resolve(startResult);307    startPromise.catch(e => {308      // The underlyingSink and underlyingSource will error the readable and writable ends on their own.309      if (transformStream._errored === false) {310        transformStream._errored = true;311        transformStream._storedError = e;312      }313    });314  }315  get readable() {316    if (IsTransformStream(this) === false) {317      throw streamBrandCheckException('readable');318    }319    return this._readable;320  }321  get writable() {322    if (IsTransformStream(this) === false) {323      throw streamBrandCheckException('writable');324    }325    return this._writable;326  }327}328module.exports = { TransformStream };329// Helper functions for the TransformStreamDefaultController.330function defaultControllerBrandCheckException(name) {331  return new TypeError(332    `TransformStreamDefaultController.prototype.${name} can only be used on a TransformStreamDefaultController`);333}334// Helper functions for the TransformStream.335function streamBrandCheckException(name) {336  return new TypeError(...

custom_stream.js

Source:custom_stream.js

...33 cb();34}35var rs = new ReadStream();36var ws = new WriteStream();37var ts = new TransformStream();...

Using AI Code Generation

1function TransformStream() {2  var writableStrategy = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};3  var readableStrategy = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};4  var startPromise_resolve;5  var startPromise = new Promise(function (resolve) {6    startPromise_resolve = resolve;7  });8  var controller;9  var backpressurePromise = new Promise(function (resolve) {});10  var pullAlgorithm = function pullAlgorithm() {11    return backpressurePromise;12  };13  var pullController;14  var startAlgorithm = function startAlgorithm() {15    return startPromise;16  };17  var transformAlgorithm = function transformAlgorithm(chunk) {18    return Promise.resolve();19  };20  var flushAlgorithm = function flushAlgorithm() {21    return Promise.resolve();22  };23  var writableHighWaterMark = writableStrategy.highWaterMark;24  var writableSizeAlgorithm = writableStrategy.size;25  var readableHighWaterMark = readableStrategy.highWaterMark;26  var readableSizeAlgorithm = readableStrategy.size;27  var source = {28    cancel: function cancelAlgorithm(reason) {29      return Promise.resolve();30    }31  };32  var transformStream = Object.create(TransformStream.prototype);33  var writableType = 'bytes';34  var readableType = 'bytes';35  var writable = new WritableStream(source, writableStrategy);36  var readable = new ReadableStream(source, readableStrategy);37  var writableClosed = writable.closed;38  var writableReadyPromise = writable.ready;39  var readableClosed = readable.closed;40  var readableReadyPromise = readable.ready;41  Object.defineProperties(transformStream, {42    writable: {43    },44    readable: {45    },46    writableClosed: {47    },48    writableReady: {49    },50    readableClosed: {51    },52    readableReady: {53    }54  });55  var startPromise_reject;56  startPromise = new Promise(function (resolve, reject) {57    startPromise_resolve = resolve;58    startPromise_reject = reject;59  });60  var transformStreamController = Object.create(TransformStreamController.prototype);61  Object.defineProperties(transformStreamController, {62    _controlledTransformStream: {

Using AI Code Generation

1var TransformStream = require('web-streams-polyfill/ponyfill/es6').TransformStream;2var transformStream = new TransformStream({3  transform: function(chunk, controller) {4    controller.enqueue(chunk);5  }6});7var readableStream = new ReadableStream({8  start(controller) {9    controller.enqueue('a');10    controller.enqueue('b');11    controller.enqueue('c');12    controller.close();13  }14});15var writableStream = transformStream.writable;16var readableStreamClosed = readableStream.pipeTo(writableStream);17readableStreamClosed.then(function() {18  console.log('done piping to the writable side');19  var reader = transformStream.readable.getReader();20  return reader.read().then(function(result1) {21    console.log(result1);22    return reader.read().then(function(result2) {23      console.log(result2);24      return reader.read().then(function(result3) {25        console.log(result3);26        return reader.read().then(function(result4) {27          console.log(result4);28        });29      });30    });31  });32});33import { TransformStream } from 'web-streams-polyfill/ponyfill/es6';34var TransformStream = require('web-streams-polyfill/ponyfill/es5').TransformStream;35### `new TransformStream([transformer[, writableStrategy[, readableStrategy]]])`

Using AI Code Generation

1var TransformStream = require("stream").Transform;2var util = require("util");3util.inherits(ToUpperCase, TransformStream);4function ToUpperCase(options) {5  if (!(this instanceof ToUpperCase))6    return new ToUpperCase(options);7  TransformStream.call(this, options);8}9ToUpperCase.prototype._transform = function(chunk, encoding, callback) {10  this.push(chunk.toString().toUpperCase());11  callback();12};13  .pipe(new ToUpperCase())14  .pipe(process.stdout);

Using AI Code Generation

1var TransformStream = require('web-streams-polyfill/ponyfill/es6').TransformStream;2var transformStream = new TransformStream({3  transform: function(chunk, controller) {4    controller.enqueue(chunk);5  }6});7var readableStream = new ReadableStream({8  start(controller) {9    controller.enqueue('a');10    controller.enqueue('b');11    controller.enqueue('c');12    controller.close();13  }14});15var writableStream = transformStream.writable;16var readableStreamClosed = readableStream.pipeTo(writableStream);17readableStreamClosed.then(function() {18  console.log('done piping to the writable side');19  var reader = transformStream.readable.getReader();20  return reader.read().then(function(result1) {21    console.log(result1);22    return reader.read().then(function(result2) {23      console.log(result2);24      return reader.read().then(function(result3) {25        console.log(result3);26        return reader.read().then(function(result4) {27          console.log(result4);28        });29      });30    });31  });32});33import { TransformStream } from 'web-streams-polyfill/ponyfill/es6';34var TransformStream = require('web-streams-polyfill/ponyfill/es5').TransformStream;35### `new TransformStream([transformer[, writableStrategy[, readableStrategy]]])`

Using AI Code Generation

1var TransformStream = require("stream").Transform;2var util = require("util");3util.inherits(ToUpperCase, TransformStream);4function ToUpperCase(options) {5  if (!(this instanceof ToUpperCase))6    return new ToUpperCase(options);7  TransformStream.call(this, options);8}9ToUpperCase.prototype._transform = function(chunk, encoding, callback) {10  this.push(chunk.toString().toUpperCase());11  callback();12};13  .pipe(new ToUpperCase())14  .pipe(process.stdout);

Using AI Code Generation

1var TransformStream = require('stream').Transform;2var fs = require('fs');3var util = require('util');4util.inherits(ReplaceStream, TransformStream);5function ReplaceStream(searchString, replaceString, options) {6    TransformStream.call(this, options);7    this.searchString = searchString;8    this.replaceString = replaceString;9    this.tailPiece = '';10}11ReplaceStream.prototype._transform = function(chunk, encoding, cb) {12  var pieces = (this.tailPiece + chunk).split(this.searchString);13  var lastPiece = pieces[pieces.length - 1];14  var tailPieceLen = this.searchString.length - 1;15  this.tailPiece = lastPiece.slice(-tailPieceLen);16  pieces[pieces.length - 1] = lastPiece.slice(0, -tailPieceLen);17  this.push(pieces.join(this.replaceString));18  cb();19};20ReplaceStream.prototype._flush = function(cb) {21  this.push(this.tailPiece);22  cb();23};24var rs = new ReplaceStream('World', 'Node.js');25rs.on('data', function(chunk) {26  console.log(chunk.toString());27});28rs.write('Hello W');29rs.write('orld!');30rs.end();31var TransformStream = require('stream').Transform;32var fs = require('fs');33var util = require('util');pipeTo(writable);

Using AI Code Generation

1const ransfrmStream = require'stream').Transform;2const ptools = equre('wpools');3const trnsformStream = new TransformStream({4  transform: (chunk, encoding, callack) => {5    conso.log(chunk.toString());6    callback();7  }8}9wptools.page('Albert Einstein').get().then((page) => {10 ipage.html().pipe(transformStream);11}).catch((err) => {12  console.log(err);13});

Using AI Code Generation

1var wptools = require('wptools');2var fs = require('fs');3var writeStream = fs.createWriteStream('output.txt');4var stream = wptools.page('Barack_Obama').get();5stream.pipe(writeStream);6stream.on('error', function(err) {7  console.log(err);8});9st;eam.n('finish', fnction() {10  console.lo('Finised writing to file!');11});12function ReplaceStream(searchString, replaceString, options) {13    TransformStream.call(this, options);14    this.searchString = searchString;15    this.replaceString = replaceString;16    this.tailPiece = '';17}18ReplaceStream.prototype._transform = function(chunk, encoding, cb) {19  var pieces = (this.tailPiece + chunk).split(this.searchString);20  var lastPiece = pieces[pieces.length - 1];21  var tailPieceLen = this.searchString.length - 1;22  this.tailPiece = lastPiece.slice(-tailPieceLen);23  pieces[pieces.length - 1] = lastPiece.slice(0, -tailPieceLen);24  this.push(pieces.join(this.replaceString));25  cb();26};27ReplaceStream.prototype._flush = function(cb) {28  this.push(this.tailPiece);29  cb();30};31var rs = new ReplaceStream('World', 'Node.js');32rs.on('data', function(chunk) {33  console.log(chunk.toString());34});35rs.write('Hello W

Using AI Code Generation

1const { TransformStream, ReadableStream, WritableStream } = require('web-streams-polyfill/ponyfill')2const { TransformStream: TransformStreamWPT } = require('web-platform-tests/streams/resources/test-utils.js')3const { WritableStream: WritableStreamWPT } = require('web-platform-tests/streams/resources/test-utils.js')4const { ReadableStream: ReadableStreamWPT } = require('web-platform-tests/streams/resources/test-utils.js')5const { testWritableStream, testReadableStream, testTransformStream } = require('web-platform-tests/streams/resources/test-utils.js')6const assert = require('assert')7const readable = new ReadableStream({8  start(controller) {9    controller.enqueue('a');10    controller.enqueue('b');11    controller.enqueue('c');12  }13});14const transformer = {15  transform(chunk, controller) {16    controller.enqueue(chunk.toUpperCase());17  }18};19const writable = new WritableStream({20  write(chunk) {21    console.log(chunk);22  }23});24const transformStream = new TransformStream(transformer);25const readableStream = transformStream.readable;26const writableStream = transformStream.writable;27readable.pipeTo(writableStream);28const upperCaseReadable = readable.pipeThrough(transformStream);29readable.pipeThrough(transformStream).pipeTo(writable);30const upperCaseReadable = readable.pipeThrough(transformStream);31readable.pipeThrough(transformStream).pipeTo(writable);32const upperCaseReadable = readable.pipeThrough(transformStream);33readable.pipeThrough(transformStream).pipeTo(writable);34const upperCaseReadable = readable.pipeThrough(transformStream);35readable.pipeThrough(transformStream).pipeTo(writable);

Using AI Code Generation

1var TransformStream = require('stream').Transform;2var fs = require('fs');3var wptools = require('wptools');4var category = 'Category:Indian_films_of_2015';5var stream = new TransformStream({ objectMode: true });6var file = fs.createWriteStream('category.txt');7stream._transform = function (page, encoding, done) {8    this.push(page.data.title + '9');10    done();11};12stream.pipe(file);13wptools.category(category_url).getPages(stream);

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