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Viewing file:     DraftEntitySegments.js (2.4 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';

/**
 * Identify the range to delete from a segmented entity.
 *
 * Rules:
 *
 *  Example: 'John F. Kennedy'
 *
 *   - Deletion from within any non-whitespace (i.e. ['John', 'F.', 'Kennedy'])
 *     will return the range of that text.
 *
 *       'John F. Kennedy' -> 'John F.'
 *                  ^
 *
 *   - Forward deletion of whitespace will remove the following section:
 *
 *       'John F. Kennedy' -> 'John Kennedy'
 *            ^
 *
 *   - Backward deletion of whitespace will remove the previous section:
 *
 *       'John F. Kennedy' -> 'F. Kennedy'
 *            ^
 */
var DraftEntitySegments = {
  getRemovalRange: function getRemovalRange(selectionStart, selectionEnd, text, entityStart, direction) {
    var segments = text.split(' ');
    segments = segments.map(function (
    /*string*/
    segment,
    /*number*/
    ii) {
      if (direction === 'forward') {
        if (ii > 0) {
          return ' ' + segment;
        }
      } else if (ii < segments.length - 1) {
        return segment + ' ';
      }

      return segment;
    });
    var segmentStart = entityStart;
    var segmentEnd;
    var segment;
    var removalStart = null;
    var removalEnd = null;

    for (var jj = 0; jj < segments.length; jj++) {
      segment = segments[jj];
      segmentEnd = segmentStart + segment.length; // Our selection overlaps this segment.

      if (selectionStart < segmentEnd && segmentStart < selectionEnd) {
        if (removalStart !== null) {
          removalEnd = segmentEnd;
        } else {
          removalStart = segmentStart;
          removalEnd = segmentEnd;
        }
      } else if (removalStart !== null) {
        break;
      }

      segmentStart = segmentEnd;
    }

    var entityEnd = entityStart + text.length;
    var atStart = removalStart === entityStart;
    var atEnd = removalEnd === entityEnd;

    if (!atStart && atEnd || atStart && !atEnd) {
      if (direction === 'forward') {
        if (removalEnd !== entityEnd) {
          removalEnd++;
        }
      } else if (removalStart !== entityStart) {
        removalStart--;
      }
    }

    return {
      start: removalStart,
      end: removalEnd
    };
  }
};
module.exports = DraftEntitySegments;