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 /*
  * This file is part of the DOM implementation for KDE.
  *
  * Copyright (C) 1999-2003 Lars Knoll <knoll@kde.org>
  * Copyright (C) 2000-2003 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2003, 2006 Apple Computer, Inc.
  *
  * 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.
  *
  */
 #ifndef RENDERTEXT_H
 #define RENDERTEXT_H
 
 #include "dom/dom_string.h"
 #include "xml/dom_stringimpl.h"
 #include "xml/dom_textimpl.h"
 #include "rendering/render_object.h"
 #include "rendering/render_line.h"
 
 #include <QMutableVectorIterator>
 #include <assert.h>
 
 class QPainter;
 class QFontMetrics;
 
 // Define a constant for soft hyphen's unicode value.
 #define SOFT_HYPHEN 173
 
 const int cNoTruncation = -1;
 const int cFullTruncation = -2;
 
 namespace khtml
 {
 class RenderText;
 class RenderStyle;
 
 class InlineTextBox : public InlineRunBox
 {
 public:
     InlineTextBox(RenderObject *obj)
         : InlineRunBox(obj),
           // ### necessary as some codepaths (<br>) do *not* initialize these (LS)
           m_start(0), m_len(0), m_truncation(cNoTruncation), m_reversed(false), m_toAdd(0)
     {
     }
 
     uint start() const
     {
         return m_start;
     }
     uint end() const
     {
         return m_len ? m_start + m_len - 1 : m_start;
     }
     uint len() const
     {
         return m_len;
     }
 
     void detach(RenderArena *renderArena, bool noRemove = false) override;
 
     InlineTextBox *nextTextBox() const
     {
         return static_cast<InlineTextBox *>(nextLineBox());
     }
     InlineTextBox *prevTextBox() const
     {
         return static_cast<InlineTextBox *>(prevLineBox());
     }
 
     void clearTruncation() override
     {
         m_truncation = cNoTruncation;
     }
     int placeEllipsisBox(bool ltr, int blockEdge, int ellipsisWidth, bool &foundBox) override;
 
     // Overloaded new operator.  Derived classes must override operator new
     // in order to allocate out of the RenderArena.
     void *operator new(size_t sz, RenderArena *renderArena) throw();
 
     // Overridden to prevent the normal delete from being called.
     void operator delete(void *ptr, size_t sz);
 
 private:
     // The normal operator new is disallowed.
     void *operator new(size_t sz) throw();
 
 public:
     void setSpaceAdd(int add)
     {
         m_width -= m_toAdd;
         m_toAdd = add;
         m_width += m_toAdd;
     }
     int spaceAdd()
     {
         return m_toAdd;
     }
 
     bool isInlineTextBox() const override
     {
         return true;
     }
 
     void paint(RenderObject::PaintInfo &i, int tx, int ty) override;
     void paintDecoration(QPainter *pt, const Font *f, int _tx, int _ty, int decoration);
     void paintShadow(QPainter *pt, const Font *f, int _tx, int _ty, const ShadowData *shadow);
     void paintSelection(const Font *f, RenderText *text, QPainter *p, RenderStyle *style, int tx, int ty, int startPos, int endPos, int deco);
 
     void selectionStartEnd(int &sPos, int &ePos);
     RenderObject::SelectionState selectionState();
 
     // Return before, after (offset set to max), or inside the text, at @p offset
     FindSelectionResult checkSelectionPoint(int _x, int _y, int _tx, int _ty, int &offset);
 
     bool checkVerticalPoint(int _y, int _ty, int _h, int height)
     {
         if ((_ty + m_y > _y + _h) || (_ty + m_y + m_baseline + height < _y)) {
             return false;
         } return true;
     }
 
     /**
      * determines the offset into the DOMString of the character the given
      * coordinate points to.
      * The returned offset is never out of range.
      * @param _x given coordinate (relative to containing block)
      * @param ax returns exact coordinate the offset corresponds to
      *      (relative to containing block)
      * @return the offset (relative to the RenderText object, not to this run)
      */
     int offsetForPoint(int _x, int &ax) const;
 
     /**
      * calculates the with of the specified chunk in this text box.
      * @param pos zero-based position within the text box up to which
      *  the width is to be determined
      * @return the width in pixels
      */
     int widthFromStart(int pos) const;
 
     long caretMinOffset() const override;
     long caretMaxOffset() const override;
     unsigned long caretMaxRenderedOffset() const override;
 
     /** returns the associated render text
      */
     const RenderText *renderText() const;
     RenderText *renderText();
 
     void extractLine() override;
     void deleteLine(RenderArena *arena) override;
     void attachLine() override;
 
     int m_start;
     unsigned short m_len;
 
     int m_truncation; // Where to truncate when text overflow is applied.
     // We use special constants to denote no truncation (the whole run paints)
     // and full truncation (nothing paints at all).
 
     bool m_reversed : 1;
     unsigned m_toAdd : 14; // for justified text
 private:
     friend class RenderText;
 };
 
 class RenderText : public RenderObject
 {
     friend class InlineTextBox;
 
 public:
     RenderText(DOM::NodeImpl *node, DOM::DOMStringImpl *_str);
     virtual ~RenderText();
 
     virtual bool isTextFragment() const;
     virtual DOM::DOMStringImpl *originalString() const;
 
     const char *renderName() const override
     {
         return "RenderText";
     }
 
     void setStyle(RenderStyle *style) override;
 
     void detach() override;
 
     void deleteInlineBoxes(RenderArena *arena = nullptr) override;
     void dirtyInlineBoxes(bool fullLayout, bool) override;
     void removeInlineBox(InlineBox *_box) override;
 
     DOM::DOMString data() const
     {
         return str;
     }
     DOM::DOMStringImpl *string() const
     {
         return str;
     }
 
     InlineBox *createInlineBox(bool, bool) override;
 
     void layout() override
     {
         assert(false);
     }
 
     bool nodeAtPoint(NodeInfo &info, int x, int y, int tx, int ty, HitTestAction hitTestAction, bool inBox) override;
 
     RenderPosition positionForCoordinates(int _x, int _y) override;
 
     // Return before, after (offset set to max), or inside the text, at @p offset
     virtual FindSelectionResult checkSelectionPoint(int _x, int _y, int _tx, int _ty,
             DOM::NodeImpl *&node, int &offset,
             SelPointState &);
 
     unsigned int length() const override
     {
         if (str) {
             return str->l;
         } else {
             return 0;
         }
     }
     QChar *text() const
     {
         if (str) {
             return str->s;
         } else {
             return nullptr;
         }
     }
     unsigned int stringLength() const
     {
         return str->l;    // non virtual implementation of length()
     }
     void position(InlineBox *box, int from, int len, bool reverse) override;
 
     virtual unsigned int width(unsigned int from, unsigned int len, const Font *f) const;
     virtual unsigned int width(unsigned int from, unsigned int len, bool firstLine = false) const;
     short width() const override;
     int height() const override;
 
     // height of the contents (without paddings, margins and borders)
     short lineHeight(bool firstLine) const override;
     short baselinePosition(bool firstLine) const override;
 
     // overrides
     void calcMinMaxWidth() override;
     short minWidth() const override
     {
         return m_minWidth;
     }
     int maxWidth() const override
     {
         return m_maxWidth;
     }
 
     void trimmedMinMaxWidth(int &beginMinW, bool &beginWS,
                             int &endMinW, bool &endWS,
                             bool &hasBreakableChar, bool &hasBreak,
                             int &beginMaxW, int &endMaxW,
                             int &minW, int &maxW, bool &stripFrontSpaces);
 
     bool containsOnlyWhitespace(unsigned int from, unsigned int len) const;
 
     ushort startMin() const
     {
         return m_startMin;
     }
     ushort endMin() const
     {
         return m_endMin;
     }
 
     // returns the minimum x position of all runs relative to the parent.
     // defaults to 0.
     int minXPos() const;
 
     int inlineXPos() const override;
     int inlineYPos() const override;
 
     bool hasReturn() const
     {
         return m_hasReturn;
     }
 
     virtual const QFont &font();
     short verticalPositionHint(bool firstLine) const override;
 
     bool isFixedWidthFont() const;
 
     void setText(DOM::DOMStringImpl *text, bool force = false);
 
     SelectionState selectionState() const override
     {
         return KDE_CAST_BF_ENUM(SelectionState, m_selectionState);
     }
     void setSelectionState(SelectionState s) override
     {
         m_selectionState = s;
     }
     void caretPos(int offset, int flags, int &_x, int &_y, int &width, int &height) const override;
     bool absolutePosition(int &/*xPos*/, int &/*yPos*/, bool f = false) const override;
     bool posOfChar(int ch, int &x, int &y) const;
     bool isPointInsideSelection(int x, int y, const DOM::Selection &) const override;
 
     short marginLeft() const override
     {
         return style()->marginLeft().minWidth(0);
     }
     short marginRight() const override
     {
         return style()->marginRight().minWidth(0);
     }
 
     void repaint(Priority p = NormalPriority) override;
 
     InlineTextBox *firstTextBox() const
     {
         return m_firstTextBox;
     }
     InlineTextBox *lastTextBox() const
     {
         return m_lastTextBox;
     }
 
     QList< QRectF > getClientRects() override;
 
     bool hasBreakableChar() const
     {
         return m_hasBreakableChar;
     }
     bool isSimpleText() const
     {
         return m_isSimpleText;
     }
     const QFontMetrics &metrics(bool firstLine) const;
     const Font *htmlFont(bool firstLine) const;
 
     DOM::TextImpl *element() const
     {
         return static_cast<DOM::TextImpl *>(RenderObject::element());
     }
 
     InlineBox *inlineBox(long offset) override;
 
     void removeTextBox(InlineTextBox *box);
     void attachTextBox(InlineTextBox *box);
     void extractTextBox(InlineTextBox *box);
 
 #ifdef ENABLE_DUMP
     void dump(QTextStream &stream, const QString &ind) const override;
 #endif
 
     long caretMinOffset() const override;
     long caretMaxOffset() const override;
     unsigned long caretMaxRenderedOffset() const override;
 
     /** Find the text box that includes the character at @p offset
      * and return pos, which is the position of the char in the run.
      * @param offset zero-based offset into DOM string
      * @param pos returns relative position within text box
      * @param checkFirstLetter passing @p true will also regard :first-letter
      *      boxes, if available.
      * @return the text box, or 0 if no match has been found
      */
     const InlineTextBox *findInlineTextBox(int offset, int &pos,
                                            bool checkFirstLetter = false) const;
 
     // helper methods to convert Position from rendered text into DOM position
     // (takes into account space collapsing)
     unsigned convertToDOMPosition(unsigned position) const;
     unsigned convertToRenderedPosition(unsigned position) const;
 protected:
     virtual void setTextInternal(DOM::DOMStringImpl *text);
 
     // members
     InlineTextBox *m_firstTextBox;
     InlineTextBox *m_lastTextBox;
 
     DOM::DOMStringImpl *str; //
 
     short m_lineHeight;
     short m_minWidth;
     int   m_maxWidth;
     short m_beginMinWidth;
     short m_endMinWidth;
 
     KDE_BF_ENUM(SelectionState) m_selectionState : 3;
     bool m_hasReturn : 1;
     bool m_hasBreakableChar : 1;
     bool m_hasBreak : 1;
     bool m_hasBeginWS : 1;
     bool m_hasEndWS : 1;
     bool m_isSimpleText : 1;
 
     ushort m_startMin : 8;
     ushort m_endMin : 8;
 };
 
 inline const RenderText *InlineTextBox::renderText() const
 {
     return static_cast<RenderText *>(object());
 }
 
 inline RenderText *InlineTextBox::renderText()
 {
     return static_cast<RenderText *>(object());
 }
 
 // Used to represent a text substring of an element, e.g., for text runs that are split because of
 // first letter and that must therefore have different styles (and positions in the render tree).
 // We cache offsets so that text transformations can be applied in such a way that we can recover
 // the original unaltered string from our corresponding DOM node.
 class RenderTextFragment : public RenderText
 {
 public:
     RenderTextFragment(DOM::NodeImpl *_node, DOM::DOMStringImpl *_str,
                        int startOffset, int endOffset);
     RenderTextFragment(DOM::NodeImpl *_node, DOM::DOMStringImpl *_str);
     ~RenderTextFragment();
 
     bool isTextFragment() const override;
     const char *renderName() const override
     {
         return "RenderTextFragment";
     }
 
     uint start() const
     {
         return m_start;
     }
     uint end() const
     {
         return m_end;
     }
 
     DOM::DOMStringImpl *contentString() const
     {
         return m_generatedContentStr;
     }
     DOM::DOMStringImpl *originalString() const override;
 
     RenderObject *firstLetter() const
     {
         return m_firstLetter;
     }
     void setFirstLetter(RenderObject *firstLetter)
     {
         m_firstLetter = firstLetter;
     }
 
     // overrides
     void detach() override;
 private:
     void setTextInternal(DOM::DOMStringImpl *text) override;
 
     uint m_start;
     uint m_end;
     DOM::DOMStringImpl *m_generatedContentStr;
     RenderObject *m_firstLetter;
 };
 } // end namespace
 #endif