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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/hyphenation/hyphenation_impl.h"
#include <algorithm>
#include <map>
#include <utility>
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/metrics/histogram_macros.h"
#include "base/no_destructor.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/task/post_task.h"
#include "base/task/thread_pool.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
namespace {
using DictionaryFileMap = std::unordered_map<std::string, base::File>;
bool IsValidLocale(const std::string& locale) {
return std::all_of(locale.cbegin(), locale.cend(), [](const char ch) {
return base::IsAsciiAlpha(ch) || base::IsAsciiDigit(ch) || ch == '-';
});
}
base::File GetDictionaryFile(const std::string& locale) {
// Keep Files open in the cache for subsequent calls.
static base::NoDestructor<DictionaryFileMap> cache;
const auto& it = cache->find(locale);
if (it != cache->end())
return it->second.Duplicate();
const auto& inserted = cache->insert(std::make_pair(locale, base::File()));
base::File& file = inserted.first->second;
DCHECK(!file.IsValid());
#if defined(OS_ANDROID)
base::FilePath dir("/system/usr/hyphen-data");
#else
#error "This configuration is not supported."
#endif
std::string filename = base::StringPrintf("hyph-%s.hyb", locale.c_str());
base::FilePath path = dir.AppendASCII(filename);
file.Initialize(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
return file.Duplicate();
}
} // namespace
namespace hyphenation {
HyphenationImpl::HyphenationImpl() {}
HyphenationImpl::~HyphenationImpl() {}
// static
void HyphenationImpl::Create(
mojo::PendingReceiver<blink::mojom::Hyphenation> receiver) {
mojo::MakeSelfOwnedReceiver(std::make_unique<HyphenationImpl>(),
std::move(receiver));
}
// static
scoped_refptr<base::SequencedTaskRunner> HyphenationImpl::GetTaskRunner() {
static base::NoDestructor<scoped_refptr<base::SequencedTaskRunner>> runner(
base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN,
base::TaskPriority::USER_BLOCKING}));
return *runner;
}
void HyphenationImpl::OpenDictionary(const std::string& locale,
OpenDictionaryCallback callback) {
DCHECK(GetTaskRunner()->RunsTasksInCurrentSequence());
if (IsValidLocale(locale))
std::move(callback).Run(GetDictionaryFile(locale));
else
std::move(callback).Run(base::File());
}
} // namespace hyphenation
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