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math_iter.h
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C/C++ Source or Header
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1998-04-23
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388 lines
// -*- C++ -*-
/*
* File: math_iter.h
* Purpose: Iterator for Math paragraphs
* Author: Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
* Created: January 1997
* Description: Using iterators is the only way to handle math paragraphs
*
* Dependencies: Xlib
*
* Copyright: (c) 1996, 1997 Alejandro Aguilar Sierra
*
* Version: 0.8beta, Mathed & Lyx project.
*
* You are free to use and modify this code under the terms of
* the GNU General Public Licence version 2 or later.
*
*/
#ifndef __MATH_ITER__
#define __MATH_ITER__
#ifdef __GNUG__
#pragma interface
#endif
#include "math_defs.h"
///
enum mathIterFlags {
/// Allow newlines
MthIF_CR = 1,
/// Allow tabs
MthIF_Tabs = 2
};
/**
Specialized array iterator for amth paragraph. Used for
storing and querying data operations
*/
class MathedIter {
public:
///
MathedIter()
{
pos = 0;
fcode = 0;
array = NULL;
flags = 0;
ncols = row = col = 0;
}
///
MathedIter(LyxArrayBase *);
///
virtual ~MathedIter() { }
///
bool goNextCode(MathedTextCodes);
///
void goPosRel(int);
///
void goPosAbs(int);
///
int Empty() { return array->last<=1; }
///
int OK() { return (pos < array->last); }
///
int IsFirst() { return (pos==0); }
///
byte GetChar();
///
byte* GetString(int& len);
///
MathedInset* GetInset();
///
MathParInset* GetActiveInset();
///
bool IsInset();
///
bool IsActive();
///
bool IsFont();
///
bool IsScript();
///
bool IsTab();
///
bool IsCR();
///
virtual void Reset();
///
virtual void Insert(byte, MathedTextCodes c=LM_TC_CONST);
///
virtual void Insert(MathedInset*, int t=LM_TC_INSET);
///
virtual bool Delete();
///
virtual bool Next();
/// Check consistency of tabs and newlines
void checkTabs();
/// Try to adjust tabs in the expected place, as in eqnarrays
void adjustTabs();
///
short FCode() const { return fcode; }
///
int getPos() const { return pos; }
///
int getRow() const { return row; }
///
int getCol() const { return col; }
///
void setNumCols(int n) { ncols = n; }
///
void SetData(LyxArrayBase *a) { array = a; Reset(); }
///
LyxArrayBase *GetData() { return array; }
/// Copy every object from position p1 to p2
LyxArrayBase *Copy(int p1=0, int p2=10000);
/// Delete every object from position p1 to p2
void Clear();
protected:
///
void split(int);
///
void join(int);
///
int flags;
///
short fcode;
///
int pos;
///
int row, col, ncols;
///
LyxArrayBase *array;
// one element stack
struct MIState {
///
short fcode;
///
int x, y;
///
int pos, row, col;
} stck;
/// Saves the current state of the iterator
virtual void ipush();
/// Recover previous state
virtual void ipop();
};
///
#define MX_WAS_SUB 1
///
#define MX_WAS_SUPER 2
/**
A graphic iterator (updates position.) Used for
metrics and updating cursor position
*/
class MathedXIter: public MathedIter {
public:
///
MathedXIter(): MathedIter() { x = y = size = 0; p = 0; crow = 0; }
///
MathedXIter(MathParInset*);
///
~MathedXIter() { };
///
void SetData(MathParInset *);
///
MathParInset *getPar() { return p; }
///
bool Next();
///
bool Prev();
///
bool Up();
///
bool Down();
///
bool goNextColumn();
///
void GoLast();
///
void GoBegin();
///
void Adjust();
///
inline void GetPos(int&, int&);
///
inline void GetIncPos(int&, int&);
///
byte* GetString(int&);
///
int GetX();
///
int GetY();
///
void subMetrics(int, int);
///
void fitCoord(int, int);
///
void getAD(int& a, int& d);
/// Create a new row and insert #ncols# tabs.
void addRow();
///
void delRow();
/**$ These two functions will be moved from here */
//@{
///
bool setLabel(char* label);
///
bool setNumbered(bool);
//@}
///
void setTab(int, int);
/// Merge the array at current position
void Merge(LyxArrayBase*);
/// Delete every object from current position to pos2
void Clean(int pos2);
MathedRowSt *adjustVerticalSt();
private:
/// This function is not recursive, as MathPar::Metrics is
void IMetrics(int, int&, int&, int&);
/// Font size (display, text, script, script2)
int size;
/// current position
int x, y;
// /// max ascent and descent
// int asc, des;
///
MathParInset *p;
// Limits auxiliary variables
/// Position and max width of a script
int sx, sw;
/// true=center, false=left align (default)
bool limits;
/// Type of previous script
short s_type;
void ipush();
void ipop();
protected:
///
MathedRowSt *crow;
private:
///
friend class MathedCursor;
};
//-------------------- Inline functions --------------------------//
inline
bool MathedIter::IsInset()
{
return MathIsInset(array->bf[pos]);
}
inline
bool MathedIter::IsActive()
{
return MathIsActive(array->bf[pos]);
}
inline
bool MathedIter::IsFont()
{
return MathIsFont(array->bf[pos]);
}
inline
bool MathedIter::IsScript()
{
return MathIsScript(array->bf[pos]);
}
inline
bool MathedIter::IsTab()
{
return (array->bf[pos]==LM_TC_TAB);
}
inline
bool MathedIter::IsCR()
{
return (array->bf[pos]==LM_TC_CR);
}
inline
MathedIter::MathedIter(LyxArrayBase *d): array(d)
{
pos = 0;
row = col = 0;
fcode = (array && IsFont()) ? array->bf[0]: 0;
}
inline
void MathedIter::ipush()
{
stck.fcode = fcode;
stck.pos = pos;
stck.row = row;
stck.col = col;
}
inline
void MathedIter::ipop()
{
fcode = stck.fcode;
pos = stck.pos;
row = stck.row;
col = stck.col;
}
inline
void MathedXIter::GetPos(int&xx, int& yy)
{
if (p)
p->GetXY(xx, yy);
else
{ xx = 0; yy = 0; }
xx += x; yy += y;
}
inline
int MathedXIter::GetX()
{
int xx, yy;
GetPos(xx, yy);
return xx;
}
inline
int MathedXIter::GetY()
{
int xx, yy;
GetPos(xx, yy);
return yy;
}
inline
void MathedXIter::GetIncPos(int& xx, int& yy)
{
xx = x; yy = y;
}
inline
void MathedXIter::getAD(int& a, int& d)
{
if (crow) {
a = crow->asc;
d = crow->desc;
} else
if (p) {
a = p->Ascent();
d = p->Descent();
} else {
a = d = 0;
}
}
#endif