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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* (C) 2000 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2003-2022 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "TabSize.h"
#include "TextFlags.h"
#include "TextSpacing.h"
#include "WritingMode.h"
#include <wtf/CheckedRef.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/text/StringView.h>
namespace WebCore {
class FloatPoint;
class FloatRect;
class FontCascade;
class GraphicsContext;
class GlyphBuffer;
class Font;
struct GlyphData;
class TextRun final : public CanMakeCheckedPtr<TextRun> {
WTF_MAKE_TZONE_ALLOCATED(TextRun);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(TextRun);
friend void add(Hasher&, const TextRun&);
public:
explicit TextRun(const String& text, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = ExpansionBehavior::defaultBehavior(), TextDirection direction = TextDirection::LTR, bool directionalOverride = false, bool characterScanForCodePath = true)
: m_text(text)
, m_tabSize(0)
, m_xpos(xpos)
, m_horizontalGlyphStretch(1)
, m_expansion(expansion)
, m_expansionBehavior(expansionBehavior)
, m_allowTabs(false)
, m_direction(static_cast<unsigned>(direction))
, m_directionalOverride(directionalOverride)
, m_characterScanForCodePath(characterScanForCodePath)
, m_disableSpacing(false)
{
ASSERT(!m_text.isNull());
}
explicit TextRun(StringView stringView, float xpos = 0, float expansion = 0, ExpansionBehavior expansionBehavior = ExpansionBehavior::defaultBehavior(), TextDirection direction = TextDirection::LTR, bool directionalOverride = false, bool characterScanForCodePath = true)
: TextRun(stringView.toStringWithoutCopying(), xpos, expansion, expansionBehavior, direction, directionalOverride, characterScanForCodePath)
{
}
explicit TextRun(WTF::HashTableDeletedValueType)
: m_text(WTF::HashTableDeletedValue)
, m_tabSize(0)
, m_xpos(0)
, m_horizontalGlyphStretch(0)
, m_expansion(0)
, m_expansionBehavior(ExpansionBehavior::defaultBehavior())
, m_allowTabs(0)
, m_direction(0)
, m_directionalOverride(0)
, m_characterScanForCodePath(0)
, m_disableSpacing(0)
{
}
explicit TextRun(WTF::HashTableEmptyValueType)
: m_text()
, m_tabSize(0)
, m_xpos(0)
, m_horizontalGlyphStretch(0)
, m_expansion(0)
, m_expansionBehavior(ExpansionBehavior::defaultBehavior())
, m_allowTabs(0)
, m_direction(0)
, m_directionalOverride(0)
, m_characterScanForCodePath(0)
, m_disableSpacing(0)
{
}
TextRun(const TextRun&) = default;
TextRun& operator=(const TextRun&) = default;
bool operator==(const TextRun&) const;
bool isHashTableEmptyValue() const { return m_text.isNull(); }
bool isHashTableDeletedValue() const { return m_text.isHashTableDeletedValue(); }
TextRun subRun(unsigned startOffset, unsigned length) const
{
ASSERT_WITH_SECURITY_IMPLICATION((startOffset + length) <= m_text.length());
auto result { *this };
if (is8Bit())
result.setText(subspan8(startOffset).first(length));
else
result.setText(subspan16(startOffset).first(length));
return result;
}
UChar operator[](unsigned i) const { RELEASE_ASSERT(i < m_text.length()); return m_text[i]; }
std::span<const LChar> span8() const { ASSERT(is8Bit()); return m_text.span8(); }
std::span<const UChar> span16() const { ASSERT(!is8Bit()); return m_text.span16(); }
std::span<const LChar> subspan8(unsigned i) const { return span8().subspan(i); }
std::span<const UChar> subspan16(unsigned i) const { return span16().subspan(i); }
bool is8Bit() const { return m_text.is8Bit(); }
unsigned length() const { return m_text.length(); }
void setText(StringView text) { ASSERT(!text.isNull()); m_text = text.toStringWithoutCopying(); }
float horizontalGlyphStretch() const { return m_horizontalGlyphStretch; }
void setHorizontalGlyphStretch(float scale) { m_horizontalGlyphStretch = scale; }
bool allowTabs() const { return m_allowTabs; }
const TabSize& tabSize() const { return m_tabSize; }
void setTabSize(bool, const TabSize&);
float xPos() const { return m_xpos; }
void setXPos(float xPos) { m_xpos = xPos; }
float expansion() const { return m_expansion; }
ExpansionBehavior expansionBehavior() const { return m_expansionBehavior; }
TextDirection direction() const { return static_cast<TextDirection>(m_direction); }
bool rtl() const { return static_cast<TextDirection>(m_direction) == TextDirection::RTL; }
bool ltr() const { return static_cast<TextDirection>(m_direction) == TextDirection::LTR; }
bool directionalOverride() const { return m_directionalOverride; }
bool characterScanForCodePath() const { return m_characterScanForCodePath; }
bool spacingDisabled() const { return m_disableSpacing; }
void disableSpacing() { m_disableSpacing = true; }
void setDirection(TextDirection direction) { m_direction = static_cast<unsigned>(direction); }
void setDirectionalOverride(bool override) { m_directionalOverride = override; }
void setCharacterScanForCodePath(bool scan) { m_characterScanForCodePath = scan; }
StringView text() const { return m_text; }
TextRun isolatedCopy() const;
const String& textAsString() const { return m_text; }
void setTextSpacingState(TextSpacing::SpacingState spacingState) { m_textSpacingState = spacingState; }
TextSpacing::SpacingState textSpacingState() const { return m_textSpacingState; }
private:
String m_text;
TabSize m_tabSize;
// m_xpos is the x position relative to the left start of the text line, not relative to the left
// start of the containing block. In the case of right alignment or center alignment, left start of
// the text line is not the same as left start of the containing block. This variable is only used
// to calculate the width of \t
float m_xpos;
float m_horizontalGlyphStretch;
float m_expansion;
ExpansionBehavior m_expansionBehavior;
TextSpacing::SpacingState m_textSpacingState;
unsigned m_allowTabs : 1;
unsigned m_direction : 1;
unsigned m_directionalOverride : 1; // Was this direction set by an override character.
unsigned m_characterScanForCodePath : 1;
unsigned m_disableSpacing : 1;
};
inline void TextRun::setTabSize(bool allow, const TabSize& size)
{
m_allowTabs = allow;
m_tabSize = size;
}
inline TextRun TextRun::isolatedCopy() const
{
TextRun clone = *this;
// We need to ensure a deep copy here, calling `clone.m_text.isolatedCopy()`
// is insufficient (rdar://125823370).
if (clone.m_text.is8Bit())
clone.m_text = clone.m_text.span8();
else
clone.m_text = clone.m_text.span16();
return clone;
}
TextStream& operator<<(TextStream&, const TextRun&);
} // namespace WebCore
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