mirror of
https://github.com/classilla/tenfourfox.git
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154 lines
4.9 KiB
C++
154 lines
4.9 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 "gfxSkipChars.h"
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#include "mozilla/BinarySearch.h"
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struct SkippedRangeStartComparator
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{
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const uint32_t mOffset;
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explicit SkippedRangeStartComparator(const uint32_t aOffset) : mOffset(aOffset) {}
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int operator()(const gfxSkipChars::SkippedRange& aRange) const {
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return (mOffset < aRange.Start()) ? -1 : 1;
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}
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};
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void
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gfxSkipCharsIterator::SetOriginalOffset(int32_t aOffset)
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{
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aOffset += mOriginalStringToSkipCharsOffset;
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if (MOZ_UNLIKELY(uint32_t(aOffset) > mSkipChars->mCharCount)) {
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gfxCriticalError() <<
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"invalid offset " << aOffset <<
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" for gfxSkipChars length " << mSkipChars->mCharCount;
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aOffset = mSkipChars->mCharCount;
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}
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mOriginalStringOffset = aOffset;
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const uint32_t rangeCount = mSkipChars->mRanges.Length();
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if (rangeCount == 0) {
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mSkippedStringOffset = aOffset;
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return;
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}
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// at start of string?
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if (aOffset == 0) {
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mSkippedStringOffset = 0;
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mCurrentRangeIndex =
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rangeCount && mSkipChars->mRanges[0].Start() == 0 ? 0 : -1;
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return;
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}
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// find the range that includes or precedes aOffset
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const nsTArray<gfxSkipChars::SkippedRange>& ranges = mSkipChars->mRanges;
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size_t idx;
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mozilla::BinarySearchIf(ranges, 0, rangeCount,
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SkippedRangeStartComparator(aOffset),
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&idx);
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if (idx == rangeCount) {
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mCurrentRangeIndex = rangeCount - 1;
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} else if (uint32_t(aOffset) < ranges[idx].Start()) {
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mCurrentRangeIndex = idx - 1;
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if (mCurrentRangeIndex == -1) {
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mSkippedStringOffset = aOffset;
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return;
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}
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} else {
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mCurrentRangeIndex = idx;
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}
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const gfxSkipChars::SkippedRange& r = ranges[mCurrentRangeIndex];
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if (uint32_t(aOffset) < r.End()) {
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mSkippedStringOffset = r.SkippedOffset();
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return;
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}
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mSkippedStringOffset = aOffset - r.NextDelta();
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}
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struct SkippedRangeOffsetComparator
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{
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const uint32_t mOffset;
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explicit SkippedRangeOffsetComparator(const uint32_t aOffset) : mOffset(aOffset) {}
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int operator()(const gfxSkipChars::SkippedRange& aRange) const {
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return (mOffset < aRange.SkippedOffset()) ? -1 : 1;
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}
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};
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void
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gfxSkipCharsIterator::SetSkippedOffset(uint32_t aOffset)
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{
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NS_ASSERTION((mSkipChars->mRanges.IsEmpty() &&
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aOffset <= mSkipChars->mCharCount) ||
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(aOffset <= mSkipChars->LastRange().SkippedOffset() +
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mSkipChars->mCharCount -
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mSkipChars->LastRange().End()),
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"Invalid skipped offset");
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mSkippedStringOffset = aOffset;
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uint32_t rangeCount = mSkipChars->mRanges.Length();
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if (rangeCount == 0) {
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mOriginalStringOffset = aOffset;
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return;
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}
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const nsTArray<gfxSkipChars::SkippedRange>& ranges = mSkipChars->mRanges;
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size_t idx;
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mozilla::BinarySearchIf(ranges, 0, rangeCount,
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SkippedRangeOffsetComparator(aOffset),
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&idx);
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if (idx == rangeCount) {
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mCurrentRangeIndex = rangeCount - 1;
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} else if (aOffset < ranges[idx].SkippedOffset()) {
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mCurrentRangeIndex = idx - 1;
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if (mCurrentRangeIndex == -1) {
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mOriginalStringOffset = aOffset;
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return;
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}
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} else {
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mCurrentRangeIndex = idx;
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}
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const gfxSkipChars::SkippedRange& r = ranges[mCurrentRangeIndex];
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mOriginalStringOffset = r.End() + aOffset - r.SkippedOffset();
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}
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bool
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gfxSkipCharsIterator::IsOriginalCharSkipped(int32_t* aRunLength) const
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{
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if (mCurrentRangeIndex == -1) {
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// we're before the first skipped range (if any)
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if (aRunLength) {
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uint32_t end = mSkipChars->mRanges.IsEmpty() ?
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mSkipChars->mCharCount : mSkipChars->mRanges[0].Start();
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*aRunLength = end - mOriginalStringOffset;
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}
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return mSkipChars->mCharCount == uint32_t(mOriginalStringOffset);
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}
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const gfxSkipChars::SkippedRange& range =
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mSkipChars->mRanges[mCurrentRangeIndex];
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if (uint32_t(mOriginalStringOffset) < range.End()) {
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if (aRunLength) {
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*aRunLength = range.End() - mOriginalStringOffset;
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}
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return true;
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}
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if (aRunLength) {
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uint32_t end =
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uint32_t(mCurrentRangeIndex) + 1 < mSkipChars->mRanges.Length() ?
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mSkipChars->mRanges[mCurrentRangeIndex + 1].Start() :
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mSkipChars->mCharCount;
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*aRunLength = end - mOriginalStringOffset;
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}
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return mSkipChars->mCharCount == uint32_t(mOriginalStringOffset);
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}
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