forked from Gitlink/forgeplus-react
58 lines
1.8 KiB
JavaScript
58 lines
1.8 KiB
JavaScript
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/**
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* Copyright (c) 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule getEntityKeyForSelection
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* @format
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*
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*/
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'use strict';
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/**
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* Return the entity key that should be used when inserting text for the
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* specified target selection, only if the entity is `MUTABLE`. `IMMUTABLE`
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* and `SEGMENTED` entities should not be used for insertion behavior.
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*/
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function getEntityKeyForSelection(contentState, targetSelection) {
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var entityKey;
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if (targetSelection.isCollapsed()) {
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var key = targetSelection.getAnchorKey();
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var offset = targetSelection.getAnchorOffset();
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if (offset > 0) {
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entityKey = contentState.getBlockForKey(key).getEntityAt(offset - 1);
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if (entityKey !== contentState.getBlockForKey(key).getEntityAt(offset)) {
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return null;
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}
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return filterKey(contentState.getEntityMap(), entityKey);
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}
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return null;
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}
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var startKey = targetSelection.getStartKey();
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var startOffset = targetSelection.getStartOffset();
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var startBlock = contentState.getBlockForKey(startKey);
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entityKey = startOffset === startBlock.getLength() ? null : startBlock.getEntityAt(startOffset);
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return filterKey(contentState.getEntityMap(), entityKey);
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}
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/**
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* Determine whether an entity key corresponds to a `MUTABLE` entity. If so,
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* return it. If not, return null.
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*/
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function filterKey(entityMap, entityKey) {
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if (entityKey) {
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var entity = entityMap.__get(entityKey);
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return entity.getMutability() === 'MUTABLE' ? entityKey : null;
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}
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return null;
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}
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module.exports = getEntityKeyForSelection;
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