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Viewing file:     BlockTree.js (3.55 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 _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }

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; }

function _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }

var findRangesImmutable = require("./findRangesImmutable");

var getOwnObjectValues = require("./getOwnObjectValues");

var Immutable = require("immutable");

var List = Immutable.List,
    Repeat = Immutable.Repeat,
    Record = Immutable.Record;

var returnTrue = function returnTrue() {
  return true;
};

var defaultLeafRange = {
  start: null,
  end: null
};
var LeafRange = Record(defaultLeafRange);
var defaultDecoratorRange = {
  start: null,
  end: null,
  decoratorKey: null,
  leaves: null
};
var DecoratorRange = Record(defaultDecoratorRange);
var BlockTree = {
  /**
   * Generate a block tree for a given ContentBlock/decorator pair.
   */
  generate: function generate(contentState, block, decorator) {
    var textLength = block.getLength();

    if (!textLength) {
      return List.of(new DecoratorRange({
        start: 0,
        end: 0,
        decoratorKey: null,
        leaves: List.of(new LeafRange({
          start: 0,
          end: 0
        }))
      }));
    }

    var leafSets = [];
    var decorations = decorator ? decorator.getDecorations(block, contentState) : List(Repeat(null, textLength));
    var chars = block.getCharacterList();
    findRangesImmutable(decorations, areEqual, returnTrue, function (start, end) {
      leafSets.push(new DecoratorRange({
        start: start,
        end: end,
        decoratorKey: decorations.get(start),
        leaves: generateLeaves(chars.slice(start, end).toList(), start)
      }));
    });
    return List(leafSets);
  },
  fromJS: function fromJS(_ref) {
    var leaves = _ref.leaves,
        other = _objectWithoutPropertiesLoose(_ref, ["leaves"]);

    return new DecoratorRange(_objectSpread({}, other, {
      leaves: leaves != null ? List(Array.isArray(leaves) ? leaves : getOwnObjectValues(leaves)).map(function (leaf) {
        return LeafRange(leaf);
      }) : null
    }));
  }
};
/**
 * Generate LeafRange records for a given character list.
 */

function generateLeaves(characters, offset) {
  var leaves = [];
  var inlineStyles = characters.map(function (c) {
    return c.getStyle();
  }).toList();
  findRangesImmutable(inlineStyles, areEqual, returnTrue, function (start, end) {
    leaves.push(new LeafRange({
      start: start + offset,
      end: end + offset
    }));
  });
  return List(leaves);
}

function areEqual(a, b) {
  return a === b;
}

module.exports = BlockTree;