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/*
* Copyright (C) 2023 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#pragma once
#include <unicode/umachine.h>
#include <wtf/Forward.h>
#include <wtf/text/CharacterProperties.h>
#include <wtf/text/TextStream.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
class Font;
class TextSpacingTrim;
namespace TextSpacing {
enum class CharacterClass : uint8_t {
Undefined = 0,
Ideograph = 1 << 0,
NonIdeographLetter = 1 << 1,
NonIdeographNumeral = 1 << 2,
FullWidthOpeningPunctuation = 1 << 3,
FullWidthClosingPunctuation = 1 << 4,
FullWidthMiddleDotPunctuation = 1 << 5,
FullWidthColonPunctuation = 1 << 6,
FullWidthDotPunctuation = 1 << 7
};
struct CharactersData {
char32_t previousCharacter { 0 };
char32_t currentCharacter { 0 };
char32_t nextCharacter { 0 };
CharacterClass previousCharacterClass { };
CharacterClass currentCharacterClass { };
CharacterClass nextCharacterClass { };
};
// Classes are defined at https://www.w3.org/TR/css-text-4/#text-spacing-classes
CharacterClass characterClass(char32_t character);
struct SpacingState {
bool operator==(const SpacingState&) const = default;
CharacterClass lastCharacterClassFromPreviousRun { CharacterClass::Undefined };
};
bool isIdeograph(char32_t character);
RefPtr<Font> getHalfWidthFontIfNeeded(const Font&, const TextSpacingTrim&, CharactersData&);
} // namespace TextSpacing
class TextSpacingTrim {
public:
enum class TrimType : uint8_t {
SpaceAll = 0, // equivalent to None in text-spacing shorthand
TrimAll,
Auto
};
TextSpacingTrim() = default;
TextSpacingTrim(TrimType trimType)
: m_trim(trimType)
{ }
bool isAuto() const { return m_trim == TrimType::Auto; }
bool isSpaceAll() const { return m_trim == TrimType::SpaceAll; }
bool shouldTrimSpacing(const TextSpacing::CharactersData&) const;
friend bool operator==(const TextSpacingTrim&, const TextSpacingTrim&) = default;
TrimType type() const { return m_trim; }
private:
TrimType m_trim { TrimType::SpaceAll };
};
inline WTF::TextStream& operator<<(WTF::TextStream& ts, const TextSpacingTrim& value)
{
// FIXME: add remaining values;
switch (value.type()) {
case TextSpacingTrim::TrimType::Auto:
return ts << "auto";
case TextSpacingTrim::TrimType::SpaceAll:
return ts << "space-all";
case TextSpacingTrim::TrimType::TrimAll:
return ts << "trim-all";
}
return ts;
}
class TextAutospace {
public:
enum class Type: uint8_t {
Auto = 1 << 0,
IdeographAlpha = 1 << 1,
IdeographNumeric = 1 << 2,
Normal = 1 << 3
};
using Options = OptionSet<Type>;
TextAutospace() = default;
TextAutospace(Options options)
: m_options(options)
{ }
bool isAuto() const { return m_options.contains(Type::Auto); }
bool isNoAutospace() const { return m_options.isEmpty(); }
bool isNormal() const { return m_options.contains(Type::Normal); }
bool hasIdeographAlpha() const { return m_options.containsAny({ Type::IdeographAlpha, Type::Normal }); }
bool hasIdeographNumeric() const { return m_options.containsAny({ Type::IdeographNumeric, Type::Normal }); }
Options options() { return m_options; }
friend bool operator==(const TextAutospace&, const TextAutospace&) = default;
bool shouldApplySpacing(TextSpacing::CharacterClass firstCharacterClass, TextSpacing::CharacterClass secondCharacterClass) const;
bool shouldApplySpacing(char32_t firstCharacter, char32_t secondCharacter) const;
static float textAutospaceSize(const Font&);
private:
Options m_options { };
};
inline WTF::TextStream& operator<<(WTF::TextStream& ts, const TextAutospace& value)
{
// FIXME: add remaining values;
if (value.isAuto())
return ts << "auto";
if (value.isNoAutospace())
return ts << "no-autospace";
if (value.isNormal())
return ts << "normal";
if (value.hasIdeographAlpha())
ts << "ideograph-alpha";
if (value.hasIdeographNumeric())
ts << "ideograph-numeric";
return ts;
}
} // namespace WebCore
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