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Viewing file:     DraftRemovableWord.js (1.7 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 TokenizeUtil = require("fbjs/lib/TokenizeUtil");

var punctuation = TokenizeUtil.getPunctuation(); // The apostrophe and curly single quotes behave in a curious way: when
// surrounded on both sides by word characters, they behave as word chars; when
// either neighbor is punctuation or an end of the string, they behave as
// punctuation.

var CHAMELEON_CHARS = "['\u2018\u2019]"; // Remove the underscore, which should count as part of the removable word. The
// "chameleon chars" also count as punctuation in this regex.

var WHITESPACE_AND_PUNCTUATION = '\\s|(?![_])' + punctuation;
var DELETE_STRING = '^' + '(?:' + WHITESPACE_AND_PUNCTUATION + ')*' + '(?:' + CHAMELEON_CHARS + '|(?!' + WHITESPACE_AND_PUNCTUATION + ').)*' + '(?:(?!' + WHITESPACE_AND_PUNCTUATION + ').)';
var DELETE_REGEX = new RegExp(DELETE_STRING);
var BACKSPACE_STRING = '(?:(?!' + WHITESPACE_AND_PUNCTUATION + ').)' + '(?:' + CHAMELEON_CHARS + '|(?!' + WHITESPACE_AND_PUNCTUATION + ').)*' + '(?:' + WHITESPACE_AND_PUNCTUATION + ')*' + '$';
var BACKSPACE_REGEX = new RegExp(BACKSPACE_STRING);

function getRemovableWord(text, isBackward) {
  var matches = isBackward ? BACKSPACE_REGEX.exec(text) : DELETE_REGEX.exec(text);
  return matches ? matches[0] : text;
}

var DraftRemovableWord = {
  getBackward: function getBackward(text) {
    return getRemovableWord(text, true);
  },
  getForward: function getForward(text) {
    return getRemovableWord(text, false);
  }
};
module.exports = DraftRemovableWord;