encoding_tables.h | Explore in Territory

/*
 * 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
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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_ENCODING_TABLES_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_ENCODING_TABLES_H_

#include <algorithm>
#include <array>
#include <iterator>
#include <optional>
#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 = …;
Jis0208EncodeIndex;
const WTF_EXPORT Jis0208EncodeIndex& EnsureJis0208EncodeIndexForEncode();
const WTF_EXPORT Jis0208EncodeIndex& EnsureJis0208EncodeIndexForDecode();

constexpr size_t kJis0212EncodeIndexSize = …;
Jis0212EncodeIndex;
const WTF_EXPORT Jis0212EncodeIndex& EnsureJis0212EncodeIndexForEncode();
const WTF_EXPORT Jis0212EncodeIndex& EnsureJis0212EncodeIndexForDecode();

constexpr size_t kEucKrEncodeIndexSize = …;
EucKrEncodeIndex;
const WTF_EXPORT EucKrEncodeIndex& EnsureEucKrEncodeIndexForEncode();
const WTF_EXPORT EucKrEncodeIndex& EnsureEucKrEncodeIndexForDecode();

constexpr size_t kGb18030EncodeIndexSize = …;
Gb18030EncodeIndex;
Gb18030EncodeTable;
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 { … };

struct EqualFirst { … };

struct CompareSecond { … };

template <typename T>
struct FirstAdapter { … };
template <typename T>
FirstAdapter<T> MakeFirstAdapter(const T& value) { … }

template <typename T>
struct SecondAdapter { … };
template <typename T>
SecondAdapter<T> MakeSecondAdapter(const T& value) { … }

template <typename CollectionType>
bool SortedFirstsAreUnique(const CollectionType& collection) { … }

template <typename CollectionType, typename KeyType>
static auto FindFirstInSortedPairs(const CollectionType& collection,
                                   const KeyType& key)
    -> std::optional<decltype(std::begin(collection)->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))> { … }

}  // namespace WTF

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_ENCODING_TABLES_H_
chromium/third_party/blink/renderer/platform/wtf/text/encoding_tables.h
