/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsComplexBreaker.h"
#include <algorithm>
#include "LineBreakCache.h"
#include "MainThreadUtils.h"
#include "mozilla/Assertions.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsTHashMap.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsThreadUtils.h"
using namespace mozilla;
using namespace mozilla::intl;
void ComplexBreaker::GetBreaks(
const char16_t* aText, uint32_t aLength,
uint8_t* aBreakBefore) {
// It is believed that this is only called on the main thread, so we don't
// need to lock the caching structures. A diagnostic assert is used in case
// our tests don't exercise all code paths.
MOZ_DIAGNOSTIC_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aText,
"aText shouldn't be null");
MOZ_ASSERT(aLength,
"aLength shouldn't be zero");
MOZ_ASSERT(aBreakBefore,
"aBreakBefore shouldn't be null");
// Check the cache.
LineBreakCache::KeyType key{aText, aLength};
auto entry = LineBreakCache::Cache()->Lookup(key);
if (entry) {
auto& breakBefore = entry.Data().mBreaks;
LineBreakCache::CopyAndFill(breakBefore, aBreakBefore,
aBreakBefore + aLength);
return;
}
NS_GetComplexLineBreaks(aText, aLength, aBreakBefore);
// As a very simple memory saving measure we trim off trailing elements that
// are false before caching.
auto* afterLastTrue = aBreakBefore + aLength;
while (!*(afterLastTrue - 1)) {
if (--afterLastTrue == aBreakBefore) {
break;
}
}
entry.Set(LineBreakCache::EntryType{
nsString(aText, aLength),
nsTArray<uint8_t>(aBreakBefore, afterLastTrue - aBreakBefore)});
}
