File indexing completed on 2024-09-15 03:40:11

 /*
     SPDX-FileCopyrightText: 2010 Christoph Cullmann <cullmann@kde.org>
 
     Based on code of the SmartCursor/Range by:
     SPDX-FileCopyrightText: 2003-2005 Hamish Rodda <rodda@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #ifndef KATE_TEXTRANGE_H
 #define KATE_TEXTRANGE_H
 
 #include <ktexteditor/movingrange.h>
 
 #include "katetextcursor.h"
 
 namespace KTextEditor
 {
 class MovingRangeFeedback;
 class View;
 }
 
 namespace Kate
 {
 class TextBuffer;
 
 /**
  * Class representing a 'clever' text range.
  * It will automagically move if the text inside the buffer it belongs to is modified.
  * By intention no subclass of KTextEditor::Range, must be converted manually.
  * A TextRange is allowed to be empty. If you call setInvalidateIfEmpty(true),
  * a TextRange will become automatically invalid as soon as start() == end()
  * position holds.
  */
 class TextRange final : public KTextEditor::MovingRange
 {
     // this is a friend, block changes might invalidate ranges...
     friend class TextBlock;
 
 public:
     /**
      * Construct a text range.
      * A TextRange is not allowed to be empty, as soon as start == end position, it will become
      * automatically invalid!
      * @param buffer parent text buffer
      * @param range The initial text range assumed by the new range.
      * @param insertBehavior Define whether the range should expand when text is inserted adjacent to the range.
      * @param emptyBehavior Define whether the range should invalidate itself on becoming empty.
      */
     TextRange(TextBuffer &buffer, KTextEditor::Range range, InsertBehaviors insertBehavior, EmptyBehavior emptyBehavior = AllowEmpty);
 
     /**
      * No copy constructor, don't allow this to be copied.
      */
     TextRange(const TextRange &) = delete;
 
     /**
      * Destruct the text block
      */
     ~TextRange() override;
 
     /**
      * No assignment operator, no copying around.
      */
     TextRange &operator=(const TextRange &) = delete;
 
     /**
      * Set insert behaviors.
      * @param insertBehaviors new insert behaviors
      */
     void setInsertBehaviors(InsertBehaviors insertBehaviors) override;
 
     /**
      * Get current insert behaviors.
      * @return current insert behaviors
      */
     InsertBehaviors insertBehaviors() const override;
 
     /**
      * Set if this range will invalidate itself if it becomes empty.
      * @param emptyBehavior behavior on becoming empty
      */
     void setEmptyBehavior(EmptyBehavior emptyBehavior) override;
 
     /**
      * Will this range invalidate itself if it becomes empty?
      * @return behavior on becoming empty
      */
     EmptyBehavior emptyBehavior() const override
     {
         return m_invalidateIfEmpty ? InvalidateIfEmpty : AllowEmpty;
     }
 
     /**
      * Gets the document to which this range is bound.
      * \return a pointer to the document
      */
     KTextEditor::Document *document() const override;
 
     /**
      * Set the range of this range.
      * A TextRange is not allowed to be empty, as soon as start == end position, it will become
      * automatically invalid!
      * @param range new range for this clever range
      */
     void setRange(KTextEditor::Range range) override;
 
     /**
      * \overload
      * Set the range of this range
      * A TextRange is not allowed to be empty, as soon as start == end position, it will become
      * automatically invalid!
      * @param start new start for this clever range
      * @param end new end for this clever range
      */
     void setRange(KTextEditor::Cursor start, KTextEditor::Cursor end)
     {
         KTextEditor::MovingRange::setRange(start, end);
     }
 
     /**
      * Retrieve start cursor of this range, read-only.
      * @return start cursor
      */
     const KTextEditor::MovingCursor &start() const override
     {
         return m_start;
     }
 
     /**
      * Non-virtual version of start(), which is faster.
      * @return start cursor
      */
     const TextCursor &startInternal() const
     {
         return m_start;
     }
 
     /**
      * Retrieve end cursor of this range, read-only.
      * @return end cursor
      */
     const KTextEditor::MovingCursor &end() const override
     {
         return m_end;
     }
 
     /**
      * Nonvirtual version of end(), which is faster.
      * @return end cursor
      */
     const TextCursor &endInternal() const
     {
         return m_end;
     }
 
     /**
      * Hides parent's impl of toLineRange() and uses non-virtual functions internally.
      */
     KTextEditor::LineRange toLineRange() const
     {
         return {startInternal().lineInternal(), endInternal().lineInternal()};
     }
 
     /**
      * Convert this clever range into a dumb one.
      * @return normal range
      */
     const KTextEditor::Range toRange() const
     {
         auto startCursor = KTextEditor::Cursor(startInternal().lineInternal(), startInternal().columnInternal());
         auto endCursor = KTextEditor::Cursor(endInternal().lineInternal(), endInternal().columnInternal());
         return KTextEditor::Range(startCursor, endCursor);
     }
 
     /**
      * Convert this clever range into a dumb one. Equal to toRange, allowing to use implicit conversion.
      * @return normal range
      */
     operator KTextEditor::Range() const
     {
         return toRange();
     }
 
     /**
      * Gets the active view for this range. Might be already invalid, internally only used for pointer comparisons.
      *
      * \return a pointer to the active view
      */
     KTextEditor::View *view() const override
     {
         return m_view;
     }
 
     /**
      * Sets the currently active view for this range.
      * This will trigger update of the relevant view parts, if the view changed.
      * Set view before the attribute, that will avoid not needed redraws.
      *
      * \param view View to assign to this range. If null, simply
      *                  removes the previous view.
      */
     void setView(KTextEditor::View *view) override;
 
     /**
      * Gets the active Attribute for this range.
      *
      * \return a pointer to the active attribute
      */
     const KTextEditor::Attribute::Ptr &attribute() const override
     {
         return m_attribute;
     }
 
     /**
      * \return whether a nonzero attribute is set. This is faster than checking attribute(),
      *             because the reference-counting is omitted.
      */
     bool hasAttribute() const
     {
         return m_attribute.constData();
     }
 
     /**
      * Sets the currently active attribute for this range.
      * This will trigger update of the relevant view parts.
      *
      * \param attribute Attribute to assign to this range. If null, simply
      *                  removes the previous Attribute.
      */
     void setAttribute(KTextEditor::Attribute::Ptr attribute) override;
 
     /**
      * Gets the active MovingRangeFeedback for this range.
      *
      * \return a pointer to the active MovingRangeFeedback
      */
     KTextEditor::MovingRangeFeedback *feedback() const override
     {
         return m_feedback;
     }
 
     /**
      * Sets the currently active MovingRangeFeedback for this range.
      * This will trigger evaluation if feedback must be send again (for example if mouse is already inside range).
      *
      * \param feedback MovingRangeFeedback to assign to this range. If null, simply
      *                  removes the previous MovingRangeFeedback.
      */
     void setFeedback(KTextEditor::MovingRangeFeedback *feedback) override;
 
     /**
      * Is this range's attribute only visible in views, not for example prints?
      * Default is false.
      * @return range visible only for views
      */
     bool attributeOnlyForViews() const override
     {
         return m_attributeOnlyForViews;
     }
 
     /**
      * Set if this range's attribute is only visible in views, not for example prints.
      * @param onlyForViews attribute only valid for views
      */
     void setAttributeOnlyForViews(bool onlyForViews) override;
 
     /**
      * Gets the current Z-depth of this range.
      * Ranges with smaller Z-depth than others will win during rendering.
      * Default is 0.0.
      *
      * \return current Z-depth of this range
      */
     qreal zDepth() const override
     {
         return m_zDepth;
     }
 
     /**
      * Set the current Z-depth of this range.
      * Ranges with smaller Z-depth than others will win during rendering.
      * This will trigger update of the relevant view parts, if the depth changed.
      * Set depth before the attribute, that will avoid not needed redraws.
      * Default is 0.0.
      *
      * \param zDepth new Z-depth of this range
      */
     void setZDepth(qreal zDepth) override;
 
 private:
     /**
      * Check if range is valid, used by constructor and setRange.
      * If at least one cursor is invalid, both will set to invalid.
      * Same if range itself is invalid (start >= end).
      *
      * IMPORTANT: Notifications might need to deletion of this range!
      *
      * @param oldLineRange line range of this range before changing of cursors, needed to add/remove range from m_ranges in blocks, required!
      * @param notifyAboutChange should feedback be emitted or not?
      */
     void checkValidity(KTextEditor::LineRange oldLineRange, bool notifyAboutChange = true);
 
     /**
      * Add/Remove range from the lookup m_ranges hash of each block
      * @param oldLineRange old line range before changing of cursors, needed to add/remove range from m_ranges in blocks
      * @param lineRange line range to start looking for the range to remove
      */
     void fixLookup(KTextEditor::LineRange oldLineRange, KTextEditor::LineRange lineRange);
 
     /**
      * Mark this range for later validity checking.
      */
     void setValidityCheckRequired()
     {
         m_isCheckValidityRequired = true;
     }
 
     /**
      * Does this range need validity checking?
      * @return is checking required?
      */
     bool isValidityCheckRequired() const
     {
         return m_isCheckValidityRequired;
     }
 
 private:
     /**
      * parent text buffer
      * is a reference, and no pointer, as this must always exist and can't change
      */
     TextBuffer &m_buffer;
 
     /**
      * Start cursor for this range, is a clever cursor
      */
     TextCursor m_start;
 
     /**
      * End cursor for this range, is a clever cursor
      */
     TextCursor m_end;
 
     /**
      * The view for which the attribute is valid, 0 means any view
      */
     KTextEditor::View *m_view;
 
     /**
      * This range's current attribute.
      */
     KTextEditor::Attribute::Ptr m_attribute;
 
     /**
      * pointer to the active MovingRangeFeedback
      */
     KTextEditor::MovingRangeFeedback *m_feedback;
 
     /**
      * Z-depth of this range for rendering
      */
     qreal m_zDepth;
 
     /**
      * Is this range's attribute only visible in views, not for example prints?
      */
     bool m_attributeOnlyForViews;
 
     /**
      * Will this range invalidate itself if it becomes empty?
      */
     bool m_invalidateIfEmpty;
 
     /**
      * Should this range be validated?
      * Used by KateTextBlock to avoid multiple updates without costly hashing.
      * Reset by checkValidity().
      */
     bool m_isCheckValidityRequired = false;
 };
 
 }
 
 #endif