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/*
* Copyright (C) 2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_ENCODING_TABLES_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_ENCODING_TABLES_H_
#include <stddef.h>
#include <algorithm>
#include <array>
#include <iterator>
#include <optional>
#include <type_traits>
#include <utility>
#include "base/dcheck_is_on.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_uchar.h"
#include "third_party/blink/renderer/platform/wtf/wtf_export.h"
namespace WTF {
// Following functions are helpers for TextCodecCJK, and not intended to be used
// by others.
constexpr size_t kJis0208EncodeIndexSize = 7724;
using Jis0208EncodeIndex =
std::array<std::pair<uint16_t, UChar>, kJis0208EncodeIndexSize>;
const WTF_EXPORT Jis0208EncodeIndex& EnsureJis0208EncodeIndexForEncode();
const WTF_EXPORT Jis0208EncodeIndex& EnsureJis0208EncodeIndexForDecode();
constexpr size_t kJis0212EncodeIndexSize = 6067;
using Jis0212EncodeIndex =
std::array<std::pair<uint16_t, UChar>, kJis0212EncodeIndexSize>;
const WTF_EXPORT Jis0212EncodeIndex& EnsureJis0212EncodeIndexForEncode();
const WTF_EXPORT Jis0212EncodeIndex& EnsureJis0212EncodeIndexForDecode();
constexpr size_t kEucKrEncodeIndexSize = 17048;
using EucKrEncodeIndex =
std::array<std::pair<uint16_t, UChar>, kEucKrEncodeIndexSize>;
const WTF_EXPORT EucKrEncodeIndex& EnsureEucKrEncodeIndexForEncode();
const WTF_EXPORT EucKrEncodeIndex& EnsureEucKrEncodeIndexForDecode();
constexpr size_t kGb18030EncodeIndexSize = 23940;
using Gb18030EncodeIndex =
std::array<std::pair<uint16_t, UChar>, kGb18030EncodeIndexSize>;
using Gb18030EncodeTable = std::array<UChar, kGb18030EncodeIndexSize>;
const WTF_EXPORT Gb18030EncodeIndex& EnsureGb18030EncodeIndexForEncode();
const WTF_EXPORT Gb18030EncodeTable& EnsureGb18030EncodeTable();
// Functions for using sorted arrays of pairs as a map.
// FIXME: Consider moving these functions to std_lib_extras.h for uses other
// than encoding tables.
struct CompareFirst {
template <typename TypeA, typename TypeB>
bool operator()(const TypeA& a, const TypeB& b) {
return a.first < b.first;
}
};
struct EqualFirst {
template <typename TypeA, typename TypeB>
bool operator()(const TypeA& a, const TypeB& b) {
return a.first == b.first;
}
};
struct CompareSecond {
template <typename TypeA, typename TypeB>
bool operator()(const TypeA& a, const TypeB& b) {
return a.second < b.second;
}
};
template <typename T>
struct FirstAdapter {
const T& first;
};
template <typename T>
FirstAdapter<T> MakeFirstAdapter(const T& value) {
return {value};
}
template <typename T>
struct SecondAdapter {
const T& second;
};
template <typename T>
SecondAdapter<T> MakeSecondAdapter(const T& value) {
return {value};
}
template <typename CollectionType>
bool SortedFirstsAreUnique(const CollectionType& collection) {
return std::adjacent_find(std::begin(collection), std::end(collection),
EqualFirst{}) == std::end(collection);
}
template <typename CollectionType, typename KeyType>
static auto FindFirstInSortedPairs(const CollectionType& collection,
const KeyType& key)
-> std::optional<decltype(std::begin(collection)->second)> {
if constexpr (std::is_integral_v<KeyType>) {
if (key != decltype(std::begin(collection)->first)(key))
return std::nullopt;
}
auto iterator = std::lower_bound(std::begin(collection), std::end(collection),
MakeFirstAdapter(key), CompareFirst{});
if (iterator == std::end(collection) || key < iterator->first)
return std::nullopt;
return iterator->second;
}
template <typename CollectionType, typename KeyType>
static auto FindInSortedPairs(const CollectionType& collection,
const KeyType& key)
-> std::pair<decltype(std::begin(collection)),
decltype(std::begin(collection))> {
if constexpr (std::is_integral_v<KeyType>) {
if (key != decltype(std::begin(collection)->first)(key))
return {std::end(collection), std::end(collection)};
}
return std::equal_range(std::begin(collection), std::end(collection),
MakeFirstAdapter(key), CompareFirst{});
}
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_ENCODING_TABLES_H_
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