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Viewing file:     CompositeDraftDecorator.js (3.65 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';

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

var Immutable = require("immutable");

var List = Immutable.List;
var DELIMITER = '.';
/**
 * A CompositeDraftDecorator traverses through a list of DraftDecorator
 * instances to identify sections of a ContentBlock that should be rendered
 * in a "decorated" manner. For example, hashtags, mentions, and links may
 * be intended to stand out visually, be rendered as anchors, etc.
 *
 * The list of decorators supplied to the constructor will be used in the
 * order they are provided. This allows the caller to specify a priority for
 * string matching, in case of match collisions among decorators.
 *
 * For instance, I may have a link with a `#` in its text. Though this section
 * of text may match our hashtag decorator, it should not be treated as a
 * hashtag. I should therefore list my link DraftDecorator
 * before my hashtag DraftDecorator when constructing this composite
 * decorator instance.
 *
 * Thus, when a collision like this is encountered, the earlier match is
 * preserved and the new match is discarded.
 */

var CompositeDraftDecorator = /*#__PURE__*/function () {
  function CompositeDraftDecorator(decorators) {
    _defineProperty(this, "_decorators", void 0);

    // Copy the decorator array, since we use this array order to determine
    // precedence of decoration matching. If the array is mutated externally,
    // we don't want to be affected here.
    this._decorators = decorators.slice();
  }

  var _proto = CompositeDraftDecorator.prototype;

  _proto.getDecorations = function getDecorations(block, contentState) {
    var decorations = Array(block.getText().length).fill(null);

    this._decorators.forEach(function (
    /*object*/
    decorator,
    /*number*/
    ii) {
      var counter = 0;
      var strategy = decorator.strategy;

      var callback = function callback(
      /*number*/
      start,
      /*number*/
      end) {
        // Find out if any of our matching range is already occupied
        // by another decorator. If so, discard the match. Otherwise, store
        // the component key for rendering.
        if (canOccupySlice(decorations, start, end)) {
          occupySlice(decorations, start, end, ii + DELIMITER + counter);
          counter++;
        }
      };

      strategy(block, callback, contentState);
    });

    return List(decorations);
  };

  _proto.getComponentForKey = function getComponentForKey(key) {
    var componentKey = parseInt(key.split(DELIMITER)[0], 10);
    return this._decorators[componentKey].component;
  };

  _proto.getPropsForKey = function getPropsForKey(key) {
    var componentKey = parseInt(key.split(DELIMITER)[0], 10);
    return this._decorators[componentKey].props;
  };

  return CompositeDraftDecorator;
}();
/**
 * Determine whether we can occupy the specified slice of the decorations
 * array.
 */


function canOccupySlice(decorations, start, end) {
  for (var ii = start; ii < end; ii++) {
    if (decorations[ii] != null) {
      return false;
    }
  }

  return true;
}
/**
 * Splice the specified component into our decoration array at the desired
 * range.
 */


function occupySlice(targetArr, start, end, componentKey) {
  for (var ii = start; ii < end; ii++) {
    targetArr[ii] = componentKey;
  }
}

module.exports = CompositeDraftDecorator;