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1 // Copyright 2016 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "content/browser/hyphenation/hyphenation_impl.h" | |
6 | |
7 #include <algorithm> | |
8 #include <map> | |
9 #include <utility> | |
10 | |
11 #include "base/files/file.h" | |
12 #include "base/files/file_path.h" | |
13 #include "base/strings/stringprintf.h" | |
14 #include "mojo/public/cpp/system/platform_handle.h" | |
15 | |
16 namespace { | |
17 | |
18 using DictionaryFileMap = std::unordered_map<std::string, base::File>; | |
19 | |
20 static bool IsValidLocale(const std::string& locale) { | |
21 return std::all_of(locale.cbegin(), locale.cend(), | |
22 [](const char ch) { return isalpha(ch) || ch == '-'; }); | |
23 } | |
24 | |
25 static base::File& GetDictionaryFile(const std::string& locale) { | |
26 // Keep Files open in the cache for subsequent calls. | |
27 CR_DEFINE_STATIC_LOCAL(DictionaryFileMap, cache, ()); | |
28 | |
29 // TODO(kojii): Replace find+insert with emplace()+std::piecewise_construct | |
30 // when std::map::emplace() is fully supported on all configurations. | |
dcheng
2016/07/13 02:56:28
FWIW, the C++ style owners don't really like piece
kojii
2016/07/13 05:02:28
Oh, thanks for the info. Removed the TODO. I origi
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31 const auto& it = cache.find(locale); | |
32 if (it != cache.end()) | |
33 return it->second; | |
34 base::File file_on_stack; | |
35 const auto& inserted = cache.insert( | |
36 std::make_pair(locale, std::move(file_on_stack))); | |
dcheng
2016/07/13 02:56:29
Slightly shorter to write:
const auto& inserted =
kojii
2016/07/13 05:02:29
Thought some compiler complained, but it looks lik
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37 base::File& file = inserted.first->second; | |
38 DCHECK(!file.IsValid()); | |
39 | |
40 #if defined(OS_ANDROID) | |
41 base::FilePath dir("/system/usr/hyphen-data"); | |
42 #else | |
43 #error "This configuration is not supported." | |
44 #endif | |
45 std::string filename = base::StringPrintf("hyph-%s.hyb", locale.c_str()); | |
46 base::FilePath path = dir.AppendASCII(filename); | |
47 file.Initialize(path, base::File::FLAG_OPEN | base::File::FLAG_READ); | |
48 return file; | |
49 } | |
50 | |
51 } // namespace | |
52 | |
53 namespace hyphenation { | |
54 | |
55 HyphenationImpl::HyphenationImpl(blink::mojom::HyphenationRequest request) | |
56 : binding_(this, std::move(request)) {} | |
57 | |
58 HyphenationImpl::~HyphenationImpl() {} | |
59 | |
60 // static | |
61 void HyphenationImpl::Create(blink::mojom::HyphenationRequest request) { | |
62 new HyphenationImpl(std::move(request)); | |
63 } | |
64 | |
65 void HyphenationImpl::OpenDictionary(const mojo::String& locale, | |
66 const OpenDictionaryCallback& callback) { | |
67 mojo::ScopedHandle handle; | |
68 if (IsValidLocale(locale)) { | |
69 base::File& file = GetDictionaryFile(locale); | |
70 if (file.IsValid()) | |
71 handle = mojo::WrapPlatformFile(file.Duplicate().TakePlatformFile()); | |
72 } | |
73 callback.Run(std::move(handle)); | |
74 } | |
75 | |
76 } // namespace hyphenation | |
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