forked from Gitlink/forgeplus-react
69 lines
1.9 KiB
JavaScript
69 lines
1.9 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 encodeInlineStyleRanges
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* @format
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*
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*/
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'use strict';
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var UnicodeUtils = require('fbjs/lib/UnicodeUtils');
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var findRangesImmutable = require('./findRangesImmutable');
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var areEqual = function areEqual(a, b) {
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return a === b;
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};
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var isTruthy = function isTruthy(a) {
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return !!a;
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};
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var EMPTY_ARRAY = [];
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/**
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* Helper function for getting encoded styles for each inline style. Convert
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* to UTF-8 character counts for storage.
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*/
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function getEncodedInlinesForType(block, styleList, styleToEncode) {
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var ranges = [];
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// Obtain an array with ranges for only the specified style.
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var filteredInlines = styleList.map(function (style) {
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return style.has(styleToEncode);
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}).toList();
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findRangesImmutable(filteredInlines, areEqual,
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// We only want to keep ranges with nonzero style values.
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isTruthy, function (start, end) {
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var text = block.getText();
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ranges.push({
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offset: UnicodeUtils.strlen(text.slice(0, start)),
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length: UnicodeUtils.strlen(text.slice(start, end)),
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style: styleToEncode
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});
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});
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return ranges;
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}
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/*
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* Retrieve the encoded arrays of inline styles, with each individual style
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* treated separately.
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*/
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function encodeInlineStyleRanges(block) {
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var styleList = block.getCharacterList().map(function (c) {
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return c.getStyle();
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}).toList();
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var ranges = styleList.flatten().toSet().map(function (style) {
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return getEncodedInlinesForType(block, styleList, style);
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});
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return Array.prototype.concat.apply(EMPTY_ARRAY, ranges.toJS());
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}
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module.exports = encodeInlineStyleRanges;
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