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Viewing file:     getTextContentFromFiles.js (2.05 KB)      -rw-r--r--

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @format
 * 
 * @emails oncall+draft_js
 */
'use strict';

var invariant = require("fbjs/lib/invariant");

var TEXT_CLIPPING_REGEX = /\.textClipping$/;
var TEXT_TYPES = {
  'text/plain': true,
  'text/html': true,
  'text/rtf': true
}; // Somewhat arbitrary upper bound on text size. Let's not lock up the browser.

var TEXT_SIZE_UPPER_BOUND = 5000;
/**
 * Extract the text content from a file list.
 */

function getTextContentFromFiles(files, callback) {
  var readCount = 0;
  var results = [];
  files.forEach(function (
  /*blob*/
  file) {
    readFile(file, function (
    /*string*/
    text) {
      readCount++;
      text && results.push(text.slice(0, TEXT_SIZE_UPPER_BOUND));

      if (readCount == files.length) {
        callback(results.join('\r'));
      }
    });
  });
}
/**
 * todo isaac: Do work to turn html/rtf into a content fragment.
 */


function readFile(file, callback) {
  if (!global.FileReader || file.type && !(file.type in TEXT_TYPES)) {
    callback('');
    return;
  }

  if (file.type === '') {
    var _contents = ''; // Special-case text clippings, which have an empty type but include
    // `.textClipping` in the file name. `readAsText` results in an empty
    // string for text clippings, so we force the file name to serve
    // as the text value for the file.

    if (TEXT_CLIPPING_REGEX.test(file.name)) {
      _contents = file.name.replace(TEXT_CLIPPING_REGEX, '');
    }

    callback(_contents);
    return;
  }

  var reader = new FileReader();

  reader.onload = function () {
    var result = reader.result;
    !(typeof result === 'string') ? process.env.NODE_ENV !== "production" ? invariant(false, 'We should be calling "FileReader.readAsText" which returns a string') : invariant(false) : void 0;
    callback(result);
  };

  reader.onerror = function () {
    callback('');
  };

  reader.readAsText(file);
}

module.exports = getTextContentFromFiles;