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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_CASE_MAP_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_CASE_MAP_H_
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/text/unicode.h"
#include "third_party/blink/renderer/platform/wtf/wtf_export.h"
namespace blink {
class TextOffsetMap;
// This class performs the full Unicode case-mapping.
//
// See LowerASCII/UpperASCII() variants for faster, ASCII-only,
// locale-independent case-mapping.
class WTF_EXPORT CaseMap {
public:
// This is a specialized locale class that holds normalized locale for
// |CaseMap|.
class WTF_EXPORT WTF_EXPORT Locale {
public:
Locale() : case_map_locale_(nullptr) {}
explicit Locale(const AtomicString& locale);
private:
const char* case_map_locale_;
static const char* turkic_or_azeri_;
static const char* greek_;
static const char* lithuanian_;
static const char* dutch_;
friend class CaseMap;
};
// Construct from the normalized locale.
explicit CaseMap(const Locale& locale)
: case_map_locale_(locale.case_map_locale_) {}
// Construct from a locale string. The given locale is normalized.
explicit CaseMap(const AtomicString& locale) : CaseMap(Locale(locale)) {}
String ToLower(const String& source,
TextOffsetMap* offset_map = nullptr) const;
String ToUpper(const String& source,
TextOffsetMap* offset_map = nullptr) const;
String ToTitle(const String& source,
TextOffsetMap* offset_map = nullptr,
UChar previous_character = 0) const;
// Fast code path for simple cases, only for root locale.
// TODO(crbug.com/627682): This should move to private, once
// |DeprecatedLower()| is deprecated.
static scoped_refptr<StringImpl> FastToLowerInvariant(StringImpl* source);
private:
scoped_refptr<StringImpl> ToLower(StringImpl* source,
TextOffsetMap* offset_map = nullptr) const;
scoped_refptr<StringImpl> ToUpper(StringImpl* source,
TextOffsetMap* offset_map = nullptr) const;
// Fast code path for simple cases for root locale. When the fast code path is
// not possible, fallback to full Unicode casing using the root locale.
static scoped_refptr<StringImpl> ToLowerInvariant(StringImpl* source,
TextOffsetMap* offset_map);
static scoped_refptr<StringImpl> ToUpperInvariant(StringImpl* source,
TextOffsetMap* offset_map);
// Try the fast code path. Returns |nullptr| when the string cannot use the
// fast code path. The caller is responsible to fallback to full algorithm.
static scoped_refptr<StringImpl> TryFastToLowerInvariant(StringImpl* source);
const char* case_map_locale_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_CASE_MAP_H_
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