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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 { BlockNodeRecord } from "./BlockNodeRecord"; import type { DraftInlineStyle } from "./DraftInlineStyle"; import type { InlineStyleRange } from "./InlineStyleRange"; import type { List } from "immutable"; const UnicodeUtils = require("fbjs/lib/UnicodeUtils"); const findRangesImmutable = require("./findRangesImmutable"); const areEqual = (a, b) => a === b; const isTruthy = a => !!a; const EMPTY_ARRAY = []; /** * Helper function for getting encoded styles for each inline style. Convert * to UTF-8 character counts for storage. */ function getEncodedInlinesForType(block: BlockNodeRecord, styleList: List<DraftInlineStyle>, styleToEncode: string): Array<InlineStyleRange> { const ranges = []; // Obtain an array with ranges for only the specified style. const filteredInlines = styleList.map(style => style.has(styleToEncode)).toList(); findRangesImmutable(filteredInlines, areEqual, // We only want to keep ranges with nonzero style values. isTruthy, (start, end) => { const text = block.getText(); ranges.push({ offset: UnicodeUtils.strlen(text.slice(0, start)), length: UnicodeUtils.strlen(text.slice(start, end)), style: styleToEncode }); }); return ranges; } /* * Retrieve the encoded arrays of inline styles, with each individual style * treated separately. */ function encodeInlineStyleRanges(block: BlockNodeRecord): Array<InlineStyleRange> { const styleList = block.getCharacterList().map(c => c.getStyle()).toList(); const ranges = styleList.flatten().toSet().map(style => getEncodedInlinesForType(block, styleList, style)); return Array.prototype.concat.apply(EMPTY_ARRAY, ranges.toJS()); } module.exports = encodeInlineStyleRanges;
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