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/** * 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 * @flow strict-local * @emails oncall+draft_js */ 'use strict'; import type EditorState from "./EditorState"; function isSelectionAtLeafStart(editorState: EditorState): boolean { const selection = editorState.getSelection(); const anchorKey = selection.getAnchorKey(); const blockTree = editorState.getBlockTree(anchorKey); const offset = selection.getStartOffset(); let isAtStart = false; blockTree.some(leafSet => { if (offset === leafSet.get('start')) { isAtStart = true; return true; } if (offset < leafSet.get('end')) { return leafSet.get('leaves').some(leaf => { const leafStart = leaf.get('start'); if (offset === leafStart) { isAtStart = true; return true; } return false; }); } return false; }); return isAtStart; } module.exports = isSelectionAtLeafStart;
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