зеркало из https://github.com/mozilla/gecko-dev.git
43 строки
1.7 KiB
C++
43 строки
1.7 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsBidi.h"
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nsresult nsBidi::CountRuns(int32_t* aRunCount) {
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UErrorCode errorCode = U_ZERO_ERROR;
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*aRunCount = ubidi_countRuns(mBiDi, &errorCode);
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if (U_SUCCESS(errorCode)) {
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mLength = ubidi_getProcessedLength(mBiDi);
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mLevels = mLength > 0 ? ubidi_getLevels(mBiDi, &errorCode) : nullptr;
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}
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return ICUUtils::UErrorToNsResult(errorCode);
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}
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void nsBidi::GetLogicalRun(int32_t aLogicalStart, int32_t* aLogicalLimit,
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nsBidiLevel* aLevel) {
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MOZ_ASSERT(mLevels, "CountRuns hasn't been run?");
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MOZ_RELEASE_ASSERT(aLogicalStart < mLength, "Out of bound");
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// This function implements an alternative approach to get logical
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// run that is based on levels of characters, which would avoid O(n^2)
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// performance issue when used in a loop over runs.
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// Per comment in ubidi_getLogicalRun, that function doesn't use this
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// approach because levels have special interpretation when reordering
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// mode is UBIDI_REORDER_RUNS_ONLY. Since we don't use this mode in
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// Gecko, it should be safe to just use levels for this function.
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MOZ_ASSERT(ubidi_getReorderingMode(mBiDi) != UBIDI_REORDER_RUNS_ONLY,
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"Don't support UBIDI_REORDER_RUNS_ONLY mode");
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nsBidiLevel level = mLevels[aLogicalStart];
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int32_t limit;
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for (limit = aLogicalStart + 1; limit < mLength; limit++) {
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if (mLevels[limit] != level) {
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break;
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}
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}
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*aLogicalLimit = limit;
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*aLevel = level;
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}
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