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// Copyright 2016 The Chromium Authors
// 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/files/file_util.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/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/timer/elapsed_timer.h"
#include "build/build_config.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/content_client.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
namespace {
struct Dictionaries {
static Dictionaries* Get() {
static base::NoDestructor<Dictionaries> dictionaries;
return dictionaries.get();
}
#if !BUILDFLAG(IS_ANDROID)
void SetDirectory(const base::FilePath& new_dir) {
DVLOG(1) << __func__ << " " << new_dir;
DCHECK(hyphenation::HyphenationImpl::GetTaskRunner()
->RunsTasksInCurrentSequence());
DCHECK(!new_dir.empty());
if (new_dir == dir || !base::PathExists(new_dir))
return;
dir = new_dir;
cache.clear();
}
base::FilePath dir;
#endif
// Keep the files open in the cache for subsequent calls.
std::unordered_map<std::string, base::File> cache;
};
bool IsValidLocale(const std::string& locale) {
return std::ranges::all_of(locale, [](const char ch) {
return base::IsAsciiAlpha(ch) || base::IsAsciiDigit(ch) || ch == '-';
});
}
base::File GetDictionaryFile(const std::string& locale) {
DCHECK(hyphenation::HyphenationImpl::GetTaskRunner()
->RunsTasksInCurrentSequence());
Dictionaries* dictionaries = Dictionaries::Get();
#if !BUILDFLAG(IS_ANDROID)
const base::FilePath& dir = dictionaries->dir;
if (dir.empty())
return base::File();
#endif
const auto& inserted =
dictionaries->cache.insert(std::make_pair(locale, base::File()));
base::File& file = inserted.first->second;
// If the |locale| is already in the cache, duplicate the file and return it.
if (!inserted.second)
return file.Duplicate();
DCHECK(!file.IsValid());
#if BUILDFLAG(IS_ANDROID)
base::FilePath dir("/system/usr/hyphen-data");
#endif
std::string filename = base::StringPrintf("hyph-%s.hyb", locale.c_str());
base::FilePath path = dir.AppendASCII(filename);
base::ElapsedTimer timer;
file.Initialize(path, base::File::FLAG_OPEN | base::File::FLAG_READ);
UMA_HISTOGRAM_TIMES("Hyphenation.Open.File", timer.Elapsed());
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;
}
#if !BUILDFLAG(IS_ANDROID)
// static
void HyphenationImpl::RegisterGetDictionary() {
content::ContentBrowserClient* content_browser_client =
content::GetContentClient()->browser();
DCHECK(content_browser_client);
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
static bool registered = false;
if (registered)
return;
registered = true;
content_browser_client->GetHyphenationDictionary(
base::BindOnce(SetDirectory));
}
// static
void HyphenationImpl::SetDirectory(const base::FilePath& dir) {
GetTaskRunner()->PostTask(FROM_HERE,
base::BindOnce(
[](const base::FilePath& dir) {
Dictionaries::Get()->SetDirectory(dir);
},
dir));
}
#endif
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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