lyx_mirror/src/DocIterator.h
Alfredo Braunstein 09b0a337ca move forwardIdx to CursorSlice from DocIterator, as it was the only one able to travel into an invalid cursor position
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@19763 a592a061-630c-0410-9148-cb99ea01b6c8
2007-08-23 21:35:40 +00:00

294 lines
8.2 KiB
C++

// -*- C++ -*-
/**
* \file DocIterator.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author André Pönitz
*
* Full author contact details are available in file CREDITS.
*/
#ifndef DOCITERATOR_H
#define DOCITERATOR_H
#include "CursorSlice.h"
#include <vector>
#include <iosfwd>
namespace lyx {
class Text;
class MathAtom;
class Paragraph;
// only needed for gcc 2.95, remove when support terminated
template <typename A, typename B>
bool ptr_cmp(A const * a, B const * b)
{
return a == b;
}
// The public inheritance should go in favour of a suitable data member
// (or maybe private inheritance) at some point of time.
class DocIterator // : public std::vector<CursorSlice>
{
public:
/// type for cell number in inset
typedef CursorSlice::idx_type idx_type;
/// type for row indices
typedef CursorSlice::row_type row_type;
/// type for col indices
typedef CursorSlice::col_type col_type;
public:
///
DocIterator();
///
explicit DocIterator(Inset & inset);
/// access slice at position \p i
CursorSlice const & operator[](size_t i) const { return slices_[i]; }
/// access slice at position \p i
CursorSlice & operator[](size_t i) { return slices_[i]; }
/// chop a few slices from the iterator
void resize(size_t i) { slices_.resize(i); }
/// is the iterator valid?
operator const void*() const { return empty() ? 0 : this; }
/// is this iterator invalid?
bool operator!() const { return empty(); }
/// does this iterator have any content?
bool empty() const { return slices_.empty(); }
//
// access to slice at tip
//
/// access to tip
CursorSlice & top() { return slices_.back(); }
/// access to tip
CursorSlice const & top() const { return slices_.back(); }
/// access to outermost slice
CursorSlice & bottom() { return slices_.front(); }
/// access to outermost slice
CursorSlice const & bottom() const { return slices_.front(); }
/// how many nested insets do we have?
size_t depth() const { return slices_.size(); }
/// the containing inset
Inset & inset() const { return top().inset(); }
/// return the cell of the inset this cursor is in
idx_type idx() const { return top().idx(); }
/// return the cell of the inset this cursor is in
idx_type & idx() { return top().idx(); }
/// return the last possible cell in this inset
idx_type lastidx() const;
/// return the paragraph this cursor is in
pit_type pit() const { return top().pit(); }
/// return the paragraph this cursor is in
pit_type & pit() { return top().pit(); }
/// return the last possible paragraph in this inset
pit_type lastpit() const;
/// return the position within the paragraph
pos_type pos() const { return top().pos(); }
/// return the position within the paragraph
pos_type & pos() { return top().pos(); }
/// return the last position within the paragraph
pos_type lastpos() const;
/// return the number of embedded cells
size_t nargs() const;
/// return the number of embedded cells
size_t ncols() const;
/// return the number of embedded cells
size_t nrows() const;
/// return the grid row of the top cell
row_type row() const;
/// return the last row of the top grid
row_type lastrow() const { return nrows() - 1; }
/// return the grid column of the top cell
col_type col() const;
/// return the last column of the top grid
col_type lastcol() const { return ncols() - 1; }
/// the inset just behind the cursor
Inset * nextInset() const;
/// the inset just in front of the cursor
Inset * prevInset() const;
///
bool boundary() const { return boundary_; }
///
void boundary(bool b) { boundary_ = b; }
// the two methods below have been inlined out because of
// profiling results under linux when opening a document.
/// are we in mathed?.
bool inMathed() const
{ return !empty() && inset().inMathed(); }
/// are we in texted?.
bool inTexted() const
{ return !empty() && !inset().inMathed(); }
//
// math-specific part
//
/// return the mathed cell this cursor is in
MathData & cell() const;
/// the mathatom left of the cursor
MathAtom & prevAtom() const;
/// the mathatom right of the cursor
MathAtom & nextAtom() const;
// text-specific part
//
/// the paragraph we're in in text mode.
/// \warning only works within text!
Paragraph & paragraph() const;
/// the paragraph we're in in any case.
/// This method will give the containing paragraph if
/// in not in text mode (ex: in mathed).
Paragraph & innerParagraph() const;
///
Text * text() const;
/// the containing inset or the cell, respectively
Inset * realInset() const;
///
Inset * innerInsetOfType(int code) const;
///
Text * innerText() const;
//
// elementary moving
//
/**
* move on one logical position, descend into nested insets
* skip collapsed insets if \p ignorecollapsed is true
*/
void forwardPos(bool ignorecollapsed = false);
/// move on one physical character or inset
void forwardChar();
/// move on one paragraph
void forwardPar();
/// move on one inset
void forwardInset();
/// move backward one logical position
void backwardPos();
/// move backward one physical character or inset
void backwardChar();
/// move backward one paragraph
void backwardPar();
/// move backward one inset
/// FIXME: This is not implemented!
//void backwardInset();
/// are we some 'extension' (i.e. deeper nested) of the given iterator
bool hasPart(DocIterator const & it) const;
/// output
friend std::ostream &
operator<<(std::ostream & os, DocIterator const & cur);
///
friend bool operator==(DocIterator const &, DocIterator const &);
friend bool operator<(DocIterator const &, DocIterator const &);
friend bool operator>(DocIterator const &, DocIterator const &);
friend bool operator<=(DocIterator const &, DocIterator const &);
///
friend class StableDocIterator;
//protected:
///
void clear() { slices_.clear(); }
///
void push_back(CursorSlice const & sl) { slices_.push_back(sl); }
///
void pop_back() { slices_.pop_back(); }
/// recompute the inset parts of the cursor from the document data
void updateInsets(Inset * inset);
/// fix DocIterator in circumstances that should never happen.
/// \return true if the DocIterator was fixed.
bool fixIfBroken();
private:
/**
* When the cursor position is i, is the cursor after the i-th char
* or before the i+1-th char ? Normally, these two interpretations are
* equivalent, except when the fonts of the i-th and i+1-th char
* differ.
* We use boundary_ to distinguish between the two options:
* If boundary_=true, then the cursor is after the i-th char
* and if boundary_=false, then the cursor is before the i+1-th char.
*
* We currently use the boundary only when the language direction of
* the i-th char is different than the one of the i+1-th char.
* In this case it is important to distinguish between the two
* cursor interpretations, in order to give a reasonable behavior to
* the user.
*/
bool boundary_;
///
std::vector<CursorSlice> const & internalData() const {
return slices_;
}
///
std::vector<CursorSlice> slices_;
///
Inset * inset_;
};
DocIterator doc_iterator_begin(Inset & inset);
DocIterator doc_iterator_end(Inset & inset);
inline
bool operator==(DocIterator const & di1, DocIterator const & di2)
{
return di1.slices_ == di2.slices_;
}
inline
bool operator!=(DocIterator const & di1, DocIterator const & di2)
{
return !(di1 == di2);
}
// The difference to a ('non stable') DocIterator is the removed
// (overwritten by 0...) part of the CursorSlice data items. So this thing
// is suitable for external storage, but not for iteration as such.
class StableDocIterator {
public:
///
StableDocIterator() {}
/// non-explicit intended
StableDocIterator(const DocIterator & it);
///
DocIterator asDocIterator(Inset * start) const;
///
size_t size() const { return data_.size(); }
/// return the position within the paragraph
pos_type pos() const { return data_.back().pos(); }
/// return the position within the paragraph
pos_type & pos() { return data_.back().pos(); }
///
friend std::ostream &
operator<<(std::ostream & os, StableDocIterator const & cur);
///
friend std::istream &
operator>>(std::istream & is, StableDocIterator & cur);
///
friend bool
operator==(StableDocIterator const &, StableDocIterator const &);
private:
std::vector<CursorSlice> data_;
};
} // namespace lyx
#endif