lyx_mirror/src/mathed/math_cursor.C

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/*
* File: math_cursor.C
* Purpose: Interaction for mathed
* Author: Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
* Created: January 1996
* Description: Math interaction for a WYSIWYG math editor.
*
* Dependencies: Xlib, XForms
*
* Copyright: 1996, Alejandro Aguilar Sierra
*
* Version: 0.8beta, Math & Lyx project.
*
* You are free to use and modify this code under the terms of
* the GNU General Public Licence version 2 or later.
*/
#include <config.h>
#ifdef __GNUG__
#pragma implementation
#endif
#include "support/lstrings.h"
#include "support/LAssert.h"
#include "debug.h"
#include "LColor.h"
#include "Painter.h"
#include "math_cursor.h"
#include "formulabase.h"
#include "math_arrayinset.h"
#include "math_braceinset.h"
#include "math_boxinset.h"
#include "math_casesinset.h"
#include "math_charinset.h"
#include "math_deliminset.h"
#include "math_factory.h"
#include "math_hullinset.h"
#include "math_iterator.h"
#include "math_mathmlstream.h"
#include "math_parser.h"
#include "math_replace.h"
#include "math_scriptinset.h"
#include "math_spaceinset.h"
#include "math_specialcharinset.h"
#include "math_support.h"
#include <algorithm>
#include <cctype>
#define FILEDEBUG 0
using std::endl;
using std::min;
using std::max;
using std::swap;
using std::isalnum;
namespace {
struct Selection
{
typedef MathInset::col_type col_type;
typedef MathInset::row_type row_type;
typedef MathInset::idx_type idx_type;
Selection()
: data_(1, 1)
{}
void region(MathCursorPos const & i1, MathCursorPos const & i2,
row_type & r1, row_type & r2, col_type & c1, col_type & c2)
{
MathInset * p = i1.par_;
c1 = p->col(i1.idx_);
c2 = p->col(i2.idx_);
if (c1 > c2)
std::swap(c1, c2);
r1 = p->row(i1.idx_);
r2 = p->row(i2.idx_);
if (r1 > r2)
std::swap(r1, r2);
}
void grab(MathCursor const & cursor)
{
MathCursorPos i1;
MathCursorPos i2;
cursor.getSelection(i1, i2);
// shouldn'tt we assert on i1.par_ == i2.par_?
if (i1.idx_ == i2.idx_) {
data_ = MathGridInset(1, 1);
data_.cell(0) = MathArray(i1.cell(), i1.pos_, i2.pos_);
} else {
row_type r1, r2;
col_type c1, c2;
region(i1, i2, r1, r2, c1, c2);
data_ = MathGridInset(c2 - c1 + 1, r2 - r1 + 1);
for (row_type row = 0; row < data_.nrows(); ++row)
for (col_type col = 0; col < data_.ncols(); ++col) {
idx_type i = i1.par_->index(row + r1, col + c1);
data_.cell(data_.index(row, col)) = i1.par_->cell(i);
}
}
}
void erase(MathCursor & cursor)
{
MathCursorPos i1;
MathCursorPos i2;
cursor.getSelection(i1, i2);
if (i1.idx_ == i2.idx_)
i1.cell().erase(i1.pos_, i2.pos_);
else {
MathInset * p = i1.par_;
row_type r1, r2;
col_type c1, c2;
region(i1, i2, r1, r2, c1, c2);
for (row_type row = r1; row <= r2; ++row)
for (col_type col = c1; col <= c2; ++col)
p->cell(p->index(row, col)).erase();
}
cursor.cursor() = i1;
}
void paste(MathCursor & cursor) const
{
if (data_.nargs() == 1) {
// single cell/part of cell
cursor.insert(data_.cell(0));
} else {
// mulitple cells
idx_type idx;
MathGridInset * p = cursor.enclosingGrid(idx);
col_type const numcols = min(data_.ncols(), p->ncols() - p->col(idx));
row_type const numrows = min(data_.nrows(), p->nrows() - p->row(idx));
for (row_type row = 0; row < numrows; ++row)
for (col_type col = 0; col < numcols; ++col) {
idx_type i = p->index(row + p->row(idx), col + p->col(idx));
p->cell(i).push_back(data_.cell(data_.index(row, col)));
}
}
}
// glues selection to one cell
MathArray glue() const
{
MathArray ar;
for (unsigned i = 0; i < data_.nargs(); ++i)
ar.push_back(data_.cell(i));
return ar;
}
void clear()
{
data_ = MathGridInset(1, 1);
}
MathGridInset data_;
};
Selection theSelection;
}
MathCursor::MathCursor(InsetFormulaBase * formula, bool left)
: formula_(formula), lastcode_(LM_TC_VAR), selection_(false)
{
left ? first() : last();
}
void MathCursor::push(MathAtom & t)
{
Cursor_.push_back(MathCursorPos(t.nucleus()));
}
void MathCursor::pushLeft(MathAtom & t)
{
//cerr << "Entering atom "; t->write(cerr, false); cerr << " left\n";
push(t);
t->idxFirst(idx(), pos());
}
void MathCursor::pushRight(MathAtom & t)
{
//cerr << "Entering atom "; t->write(cerr, false); cerr << " right\n";
posLeft();
push(t);
t->idxLast(idx(), pos());
}
bool MathCursor::popLeft()
{
//cerr << "Leaving atom "; par()->write(cerr, false); cerr << " left\n";
if (Cursor_.size() <= 1)
return false;
if (par()->asScriptInset())
par()->asScriptInset()->removeEmptyScripts();
Cursor_.pop_back();
return true;
}
bool MathCursor::popRight()
{
//cerr << "Leaving atom "; par()->write(cerr, false); cerr << " right\n";
if (Cursor_.size() <= 1)
return false;
if (par()->asScriptInset())
par()->asScriptInset()->removeEmptyScripts();
Cursor_.pop_back();
posRight();
return true;
}
#if FILEDEBUG
void MathCursor::dump(char const * what) const
{
lyxerr << "MC: " << what << "\n";
lyxerr << " Cursor: " << Cursor_.size() << "\n";
for (unsigned i = 0; i < Cursor_.size(); ++i)
lyxerr << " i: " << i << " " << Cursor_[i] << "\n";
lyxerr << " Anchor: " << Anchor_.size() << "\n";
for (unsigned i = 0; i < Anchor_.size(); ++i)
lyxerr << " i: " << i << " " << Anchor_[i] << "\n";
lyxerr << " sel: " << selection_ << "\n";
}
#else
void MathCursor::dump(char const *) const {}
#endif
UpdatableInset * MathCursor::asHyperActiveInset() const
{
return par()->asHyperActiveInset();
}
bool MathCursor::isInside(MathInset const * p) const
{
for (unsigned i = 0; i < Cursor_.size(); ++i)
if (Cursor_[i].par_ == p)
return true;
return false;
}
bool MathCursor::openable(MathAtom const & t, bool sel) const
{
if (t->isHyperActive())
return true;
if (!t->isActive())
return false;
if (t->asScriptInset())
return false;
if (sel) {
// we can't move into anything new during selection
if (Cursor_.size() == Anchor_.size())
return false;
if (t.nucleus() != Anchor_[Cursor_.size()].par_)
return false;
}
return true;
}
bool MathCursor::posLeft()
{
if (pos() == 0)
return false;
--pos();
return true;
}
bool MathCursor::posRight()
{
if (pos() == size())
return false;
++pos();
return true;
}
bool MathCursor::left(bool sel)
{
dump("Left 1");
if (inMacroMode()) {
macroModeClose();
lastcode_ = LM_TC_VAR;
return true;
}
selHandle(sel);
lastcode_ = LM_TC_VAR;
if (hasPrevAtom() && openable(prevAtom(), sel)) {
if (prevAtom()->isHyperActive()) {
lyxerr << "entering hyperactive inset\n";
}
pushRight(prevAtom());
return true;
}
return posLeft() || idxLeft() || popLeft() || selection_;
}
bool MathCursor::right(bool sel)
{
dump("Right 1");
if (inMacroMode()) {
macroModeClose();
lastcode_ = LM_TC_VAR;
return true;
}
selHandle(sel);
lastcode_ = LM_TC_VAR;
if (hasNextAtom() && openable(nextAtom(), sel)) {
if (nextAtom()->isHyperActive()) {
lyxerr << "entering hyperactive inset\n";
int x, y;
getPos(x, y);
nextAtom()->edit(formula()->view(), x, y, 0);
}
pushLeft(nextAtom());
return true;
}
return posRight() || idxRight() || popRight() || selection_;
}
void MathCursor::first()
{
Cursor_.clear();
pushLeft(formula_->par());
}
void MathCursor::last()
{
first();
end();
}
bool positionable(MathCursor::cursor_type const & cursor,
MathCursor::cursor_type const & anchor)
{
// avoid deeper nested insets when selecting
if (cursor.size() > anchor.size())
return false;
// anchor might be deeper, should have same path then
for (MathCursor::cursor_type::size_type i = 0; i < cursor.size(); ++i)
if (cursor[i].par_ != anchor[i].par_)
return false;
// position should be ok.
return true;
}
void MathCursor::setPos(int x, int y)
{
dump("setPos 1");
bool res = bruteFind(x, y,
formula()->xlow(), formula()->xhigh(),
formula()->ylow(), formula()->yhigh());
if (!res) {
// this ccan happen on creation of "math-display"
dump("setPos 1.5");
first();
}
dump("setPos 2");
}
void MathCursor::home(bool sel)
{
dump("home 1");
selHandle(sel);
macroModeClose();
lastcode_ = LM_TC_VAR;
if (!par()->idxHome(idx(), pos()))
popLeft();
dump("home 2");
}
void MathCursor::end(bool sel)
{
dump("end 1");
selHandle(sel);
macroModeClose();
lastcode_ = LM_TC_VAR;
if (!par()->idxEnd(idx(), pos()))
popRight();
dump("end 2");
}
void MathCursor::plainErase()
{
array().erase(pos());
}
void MathCursor::plainInsert(MathAtom const & t)
{
array().insert(pos(), t);
++pos();
}
void MathCursor::insert(char c, MathTextCodes t)
{
//lyxerr << "inserting '" << c << "'\n";
plainInsert(MathAtom(new MathCharInset(c, t)));
}
void MathCursor::insert(MathAtom const & t)
{
macroModeClose();
if (selection_) {
if (t->nargs())
selCut();
else
selDel();
}
plainInsert(t);
}
void MathCursor::niceInsert(MathAtom const & t)
{
selCut();
insert(t); // inserting invalidates the pointer!
MathAtom const & p = prevAtom();
if (p->nargs()) {
posLeft();
right(); // do not push for e.g. MathSymbolInset
selPaste();
}
}
void MathCursor::insert(MathArray const & ar)
{
macroModeClose();
if (selection_)
selCut();
array().insert(pos(), ar);
pos() += ar.size();
}
void MathCursor::paste(MathArray const & ar)
{
Anchor_ = Cursor_;
selection_ = true;
array().insert(pos(), ar);
pos() += ar.size();
}
void MathCursor::backspace()
{
if (pos() == 0) {
pullArg(false);
return;
}
if (selection_) {
selDel();
return;
}
MathScriptInset * p = prevAtom()->asScriptInset();
if (p) {
p->removeScript(p->hasUp());
// Don't delete if there is anything left
if (p->hasUp() || p->hasDown())
return;
}
--pos();
plainErase();
}
void MathCursor::erase()
{
if (inMacroMode())
return;
if (selection_) {
selDel();
return;
}
// delete empty cells if necessary
if (array().empty()) {
bool popit;
bool removeit;
par()->idxDelete(idx(), popit, removeit);
if (popit && popLeft() && removeit)
plainErase();
return;
}
if (pos() == size())
return;
MathScriptInset * p = nextAtom()->asScriptInset();
if (p) {
p->removeScript(p->hasUp());
// Don't delete if there is anything left
if (p->hasUp() || p->hasDown())
return;
}
plainErase();
}
void MathCursor::delLine()
{
macroModeClose();
if (selection_) {
selDel();
return;
}
if (par()->nrows() > 1) {
// grid are the only things with more than one row...
lyx::Assert(par()->asGridInset());
par()->asGridInset()->delRow(hullRow());
}
if (idx() > par()->nargs())
idx() = par()->nargs();
if (pos() > size())
pos() = size();
}
bool MathCursor::up(bool sel)
{
dump("up 1");
macroModeClose();
selHandle(sel);
cursor_type save = Cursor_;
if (goUpDown(true))
return true;
Cursor_ = save;
return selection_;
}
bool MathCursor::down(bool sel)
{
dump("down 1");
macroModeClose();
selHandle(sel);
cursor_type save = Cursor_;
if (goUpDown(false))
return true;
Cursor_ = save;
return selection_;
}
bool MathCursor::toggleLimits()
{
if (!hasNextAtom())
return false;
MathScriptInset * t = nextAtom()->asScriptInset();
if (!t)
return false;
int old = t->limits();
t->limits(old < 0 ? 1 : -1);
return old != t->limits();
}
void MathCursor::macroModeClose()
{
string s = macroName();
if (s.size()) {
size_type old = pos();
pos() -= s.size();
array().erase(pos(), old);
interpret(s);
}
}
int MathCursor::macroNamePos() const
{
for (int i = pos() - 1; i >= 0; --i) {
MathAtom & p = array().at(i);
if (p->code() == LM_TC_TEX && p->getChar() == '\\')
return i;
}
return -1;
}
string MathCursor::macroName() const
{
string s;
for (int i = macroNamePos(); i >= 0 && i < int(pos()); ++i)
s += array().at(i)->getChar();
return s;
}
void MathCursor::selCopy()
{
dump("selCopy");
if (selection_) {
theSelection.grab(*this);
selClear();
}
}
void MathCursor::selCut()
{
dump("selCut");
if (selection_) {
theSelection.grab(*this);
theSelection.erase(*this);
selClear();
} else {
theSelection.clear();
}
}
void MathCursor::selDel()
{
dump("selDel");
if (selection_) {
theSelection.erase(*this);
if (pos() > size())
pos() = size();
selClear();
}
}
void MathCursor::selPaste()
{
dump("selPaste");
theSelection.paste(*this);
//theSelection.grab(*this);
//selClear();
}
void MathCursor::selHandle(bool sel)
{
if (sel == selection_)
return;
//theSelection.clear();
Anchor_ = Cursor_;
selection_ = sel;
}
void MathCursor::selStart()
{
dump("selStart 1");
//theSelection.clear();
Anchor_ = Cursor_;
selection_ = true;
dump("selStart 2");
}
void MathCursor::selClear()
{
dump("selClear 1");
selection_ = false;
dump("selClear 2");
}
void MathCursor::selGet(MathArray & ar)
{
dump("selGet");
if (!selection_)
return;
theSelection.grab(*this);
ar = theSelection.glue();
}
void MathCursor::drawSelection(Painter & pain) const
{
if (!selection_)
return;
MathCursorPos i1;
MathCursorPos i2;
getSelection(i1, i2);
if (i1.idx_ == i2.idx_) {
MathXArray & c = i1.xcell();
int x1 = c.xo() + c.pos2x(i1.pos_);
int y1 = c.yo() - c.ascent();
int x2 = c.xo() + c.pos2x(i2.pos_);
int y2 = c.yo() + c.descent();
pain.fillRectangle(x1, y1, x2 - x1, y2 - y1, LColor::selection);
} else {
std::vector<MathInset::idx_type> indices
= i1.par_->idxBetween(i1.idx_, i2.idx_);
for (unsigned i = 0; i < indices.size(); ++i) {
MathXArray & c = i1.xcell(indices[i]);
int x1 = c.xo();
int y1 = c.yo() - c.ascent();
int x2 = c.xo() + c.width();
int y2 = c.yo() + c.descent();
pain.fillRectangle(x1, y1, x2 - x1, y2 - y1, LColor::selection);
}
}
#if 0
// draw anchor if different from selection boundary
MathCursorPos anc = Anchor_.back();
if (anc != i1 && anc != i2) {
MathXArray & c = anc.xcell();
int x = c.xo() + c.pos2x(anc.pos_);
int y1 = c.yo() - c.ascent();
int y2 = c.yo() + c.descent();
pain.line(x, y1, x, y2, LColor::math);
}
#endif
}
void MathCursor::handleFont(MathTextCodes t)
{
macroModeClose();
if (selection_) {
MathCursorPos i1;
MathCursorPos i2;
getSelection(i1, i2);
if (i1.idx_ == i2.idx_) {
MathArray & ar = i1.cell();
for (MathInset::pos_type pos = i1.pos_; pos != i2.pos_; ++pos)
ar.at(pos)->handleFont(t);
}
} else
lastcode_ = (lastcode_ == t) ? LM_TC_VAR : t;
}
void MathCursor::handleDelim(string const & l, string const & r)
{
handleNest(new MathDelimInset(l, r));
}
void MathCursor::handleNest(MathInset * p)
{
if (selection_) {
selCut();
p->cell(0) = theSelection.glue();
}
insert(MathAtom(p)); // this invalidates p!
pushRight(prevAtom());
}
void MathCursor::getPos(int & x, int & y)
{
#ifdef WITH_WARNINGS
#warning This should probably take cellXOffset and cellYOffset into account
#endif
x = xarray().xo() + xarray().pos2x(pos());
y = xarray().yo();
}
MathInset * MathCursor::par() const
{
return cursor().par_;
}
InsetFormulaBase * MathCursor::formula()
{
return formula_;
}
MathCursor::idx_type MathCursor::idx() const
{
return cursor().idx_;
}
MathCursor::idx_type & MathCursor::idx()
{
return cursor().idx_;
}
MathCursor::pos_type MathCursor::pos() const
{
return cursor().pos_;
}
MathCursor::pos_type & MathCursor::pos()
{
return cursor().pos_;
}
bool MathCursor::inMacroMode() const
{
return macroNamePos() != -1;
}
bool MathCursor::selection() const
{
return selection_;
}
MathGridInset * MathCursor::enclosingGrid(MathCursor::idx_type & idx) const
{
for (int i = Cursor_.size() - 1; i >= 0; --i) {
MathGridInset * p = Cursor_[i].par_->asGridInset();
if (p) {
idx = Cursor_[i].idx_;
return p;
}
}
return 0;
}
void MathCursor::pullArg(bool goright)
{
dump("pullarg");
MathArray a = array();
MathScriptInset const * p = par()->asScriptInset();
if (p) {
// special handling for scripts
const bool up = p->hasUp();
popLeft();
MathScriptInset * q = nextAtom()->asScriptInset();
if (q)
q->removeScript(up);
++pos();
array().insert(pos(), a);
return;
}
if (popLeft()) {
plainErase();
array().insert(pos(), a);
if (goright)
pos() += a.size();
}
}
void MathCursor::normalize()
{
// rebreak
{
MathIterator it = ibegin(formula()->par().nucleus());
MathIterator et = iend(formula()->par().nucleus());
for ( ; it != et; ++it)
if (it.par()->asBoxInset())
it.par()->asBoxInset()->rebreak();
}
if (idx() >= par()->nargs()) {
lyxerr << "this should not really happen - 1: "
<< idx() << " " << par()->nargs() << "\n";
dump("error 2");
}
idx() = min(idx(), par()->nargs() - 1);
if (pos() > size()) {
lyxerr << "this should not really happen - 2: "
<< pos() << " " << size() << " in idx: " << idx()
<< " in atom: '";
WriteStream wi(lyxerr, false);
par()->write(wi);
lyxerr << "\n";
dump("error 4");
}
pos() = min(pos(), size());
}
MathCursor::size_type MathCursor::size() const
{
return array().size();
}
MathCursor::col_type MathCursor::hullCol() const
{
return Cursor_[0].par_->asGridInset()->col(Cursor_[0].idx_);
}
MathCursor::row_type MathCursor::hullRow() const
{
return Cursor_[0].par_->asGridInset()->row(Cursor_[0].idx_);
}
bool MathCursor::hasPrevAtom() const
{
return pos() > 0;
}
bool MathCursor::hasNextAtom() const
{
return pos() < size();
}
MathAtom const & MathCursor::prevAtom() const
{
lyx::Assert(pos() > 0);
return array().at(pos() - 1);
}
MathAtom & MathCursor::prevAtom()
{
lyx::Assert(pos() > 0);
return array().at(pos() - 1);
}
MathAtom const & MathCursor::nextAtom() const
{
lyx::Assert(pos() < size());
return array().at(pos());
}
MathAtom & MathCursor::nextAtom()
{
lyx::Assert(pos() < size());
return array().at(pos());
}
MathArray & MathCursor::array() const
{
static MathArray dummy;
if (idx() >= par()->nargs()) {
lyxerr << "############ idx_ " << idx() << " not valid\n";
return dummy;
}
if (Cursor_.size() == 0) {
lyxerr << "############ Cursor_.size() == 0 not valid\n";
return dummy;
}
return cursor().cell();
}
MathXArray & MathCursor::xarray() const
{
static MathXArray dummy;
if (Cursor_.size() == 0) {
lyxerr << "############ Cursor_.size() == 0 not valid\n";
return dummy;
}
return cursor().xcell();
}
void MathCursor::idxNext()
{
par()->idxNext(idx(), pos());
}
void MathCursor::idxPrev()
{
par()->idxPrev(idx(), pos());
}
void MathCursor::splitCell()
{
if (idx() + 1 == par()->nargs())
return;
MathArray ar = array();
ar.erase(0, pos());
array().erase(pos(), size());
++idx();
pos() = 0;
array().insert(0, ar);
}
void MathCursor::breakLine()
{
// leave inner cells
while (popRight())
;
MathHullInset * p = formula()->par()->asHullInset();
if (!p)
return;
if (p->getType() == LM_OT_SIMPLE || p->getType() == LM_OT_EQUATION) {
p->mutate(LM_OT_EQNARRAY);
idx() = 0;
pos() = size();
} else {
p->addRow(hullRow());
// split line
const row_type r = hullRow();
for (col_type c = hullCol() + 1; c < p->ncols(); ++c)
p->cell(p->index(r, c)).swap(p->cell(p->index(r + 1, c)));
// split cell
splitCell();
p->cell(idx()).swap(p->cell(idx() + p->ncols() - 1));
}
}
//void MathCursor::readLine(MathArray & ar) const
//{
// idx_type base = row() * par()->ncols();
// for (idx_type off = 0; off < par()->ncols(); ++off)
// ar.push_back(par()->cell(base + off));
//}
char MathCursor::valign() const
{
idx_type idx;
MathGridInset * p = enclosingGrid(idx);
return p ? p->valign() : '\0';
}
char MathCursor::halign() const
{
idx_type idx;
MathGridInset * p = enclosingGrid(idx);
return p ? p->halign(idx % p->ncols()) : '\0';
}
void MathCursor::getSelection(MathCursorPos & i1, MathCursorPos & i2) const
{
MathCursorPos anc = normalAnchor();
if (anc < cursor()) {
i1 = anc;
i2 = cursor();
} else {
i1 = cursor();
i2 = anc;
}
}
MathCursorPos & MathCursor::cursor()
{
lyx::Assert(Cursor_.size());
return Cursor_.back();
}
MathCursorPos const & MathCursor::cursor() const
{
lyx::Assert(Cursor_.size());
return Cursor_.back();
}
bool MathCursor::goUpDown(bool up)
{
int xlow, xhigh, ylow, yhigh;
int xo, yo;
getPos(xo, yo);
// try current cell first
xarray().boundingBox(xlow, xhigh, ylow, yhigh);
if (up)
yhigh = yo - 4;
else
ylow = yo + 4;
if (bruteFind(xo, yo, xlow, xhigh, ylow, yhigh))
return true;
// try to find an inset that knows better then we
while (1) {
// we found a cell that think something "below" us.
if (up) {
if (par()->idxUp(idx()))
break;
} else {
if (par()->idxDown(idx()))
break;
}
if (!popLeft()) {
// no such inset found, just take something "above"
return
bruteFind(xo, yo,
formula()->xlow(),
formula()->xhigh(),
up ? formula()->ylow() : yo + 4,
up ? yo - 4 : formula()->yhigh()
);
}
}
xarray().boundingBox(xlow, xhigh, ylow, yhigh);
bruteFind(xo, yo, xlow, xhigh, ylow, yhigh);
return true;
}
bool MathCursor::bruteFind(int x, int y, int xlow, int xhigh, int ylow, int yhigh)
{
cursor_type best_cursor;
double best_dist = 1e10;
MathIterator it = ibegin(formula()->par().nucleus());
MathIterator et = iend(formula()->par().nucleus());
for ( ; it != et; ++it) {
// avoid invalid nesting hen selecting
if (selection_ && !positionable(it.cursor(), Anchor_))
continue;
int xo = it.position().xpos();
int yo = it.position().ypos();
if (xlow - 2 <= xo && xo <= xhigh + 2 &&
ylow - 2 <= yo && yo <= yhigh + 2)
{
double d = (x - xo) * (x - xo) + (y - yo) * (y - yo);
if (d < best_dist) {
best_dist = d;
best_cursor = it.cursor();
}
}
}
if (best_dist < 1e10)
Cursor_ = best_cursor;
return best_dist < 1e10;
}
bool MathCursor::idxLeft()
{
return par()->idxLeft(idx(), pos());
}
bool MathCursor::idxRight()
{
return par()->idxRight(idx(), pos());
}
bool MathCursor::interpret(string const & s)
{
//lyxerr << "interpret 1: '" << s << "'\n";
if (s.empty())
return true;
if (s.size() == 1)
return interpret(s[0]);
//lyxerr << "char: '" << s[0] << "' int: " << int(s[0]) << endl;
//owner_->getIntl()->getTrans().TranslateAndInsert(s[0], lt);
//lyxerr << "trans: '" << s[0] << "' int: " << int(s[0]) << endl;
if (s.size() >= 5 && s.substr(0, 5) == "cases") {
unsigned int n = 1;
istringstream is(s.substr(5).c_str());
is >> n;
n = std::max(1u, n);
niceInsert(MathAtom(new MathCasesInset(n)));
return true;
}
if (s.size() >= 6 && s.substr(0, 6) == "matrix") {
unsigned int m = 1;
unsigned int n = 1;
string v_align;
string h_align;
istringstream is(s.substr(6).c_str());
is >> m >> n >> v_align >> h_align;
m = std::max(1u, m);
n = std::max(1u, n);
v_align += 'c';
niceInsert(MathAtom(new MathArrayInset(m, n, v_align[0], h_align)));
return true;
}
if (s.size() >= 7 && s.substr(0, 7) == "replace") {
ReplaceData rep;
istringstream is(s.substr(7).c_str());
string from, to;
is >> from >> to;
mathed_parse_cell(rep.from, from);
mathed_parse_cell(rep.to, to);
lyxerr << "replacing '" << from << "' with '" << to << "'\n";
par()->replace(rep);
return true;
}
if (s == "\\over" || s == "\\choose" || s == "\\atop") {
MathArray ar = array();
MathAtom t(createMathInset(s.substr(1)));
t->asNestInset()->cell(0).swap(array());
pos() = 0;
niceInsert(t);
popRight();
left();
return true;
}
latexkeys const * l = in_word_set(s.substr(1));
if (l && (l->token == LM_TK_FONT || l->token == LM_TK_OLDFONT)) {
lastcode_ = static_cast<MathTextCodes>(l->id);
return true;
}
niceInsert(createMathInset(s.substr(1)));
return true;
}
bool MathCursor::script(bool up)
{
macroModeClose();
selCut();
if (hasPrevAtom() && prevAtom()->asScriptInset()) {
prevAtom()->asScriptInset()->ensure(up);
pushRight(prevAtom());
idx() = up;
pos() = size();
} else if (hasNextAtom() && nextAtom()->asScriptInset()) {
nextAtom()->asScriptInset()->ensure(up);
pushLeft(nextAtom());
idx() = up;
pos() = 0;
} else {
plainInsert(MathAtom(new MathScriptInset(up)));
prevAtom()->asScriptInset()->ensure(up);
pushRight(prevAtom());
idx() = up;
pos() = 0;
}
selPaste();
dump("1");
return true;
}
bool MathCursor::interpret(char c)
{
//lyxerr << "interpret 2: '" << c << "'\n";
// handle macroMode
if (inMacroMode()) {
string name = macroName();
if (name == "\\" && c == '#') {
insert(c, LM_TC_TEX);
return true;
}
if (name == "\\" && c == '\\') {
backspace();
interpret("\\backslash");
return true;
}
if (name == "\\#" && '1' <= c && c <= '9') {
insert(c, LM_TC_TEX);
macroModeClose();
return true;
}
if (isalpha(c)) {
insert(c, LM_TC_TEX);
return true;
}
if (name == "\\") {
insert(c, LM_TC_TEX);
macroModeClose();
return true;
}
macroModeClose();
return true;
}
if (selection_) {
selClear();
if (c == ' ')
return true;
// fall through in the other cases
}
if (lastcode_ == LM_TC_TEXTRM || par()->asBoxInset()) {
// suppress direct insertion of two spaces in a row
// the still allows typing '<space>a<space>' and deleting the 'a', but
// it is better than nothing...
if (c == ' ' && hasPrevAtom() && prevAtom()->getChar() == ' ')
return true;
insert(c, LM_TC_TEXTRM);
return true;
}
if (c == ' ') {
if (hasPrevAtom() && prevAtom()->asSpaceInset()) {
prevAtom()->asSpaceInset()->incSpace();
return true;
}
if (popRight())
return true;
// if are at the very end, leave the formula
return pos() != size();
}
/*
if (strchr("{}", c)) {
insert(c, LM_TC_TEX);
return true;
}
*/
if (c == '{') {
niceInsert(MathAtom(new MathBraceInset));
return true;
}
if (c == '}') {
return true;
}
if (strchr("#$%", c)) {
insert(MathAtom(new MathSpecialCharInset(c)));
lastcode_ = LM_TC_VAR;
return true;
}
if (isalpha(c) && lastcode_ == LM_TC_GREEK) {
insert(c, LM_TC_VAR);
return true;
}
if (isalpha(c) && lastcode_ == LM_TC_GREEK1) {
insert(c, LM_TC_VAR);
lastcode_ = LM_TC_VAR;
return true;
}
if (c == '\\') {
insert(c, LM_TC_TEX);
//bv->owner()->message(_("TeX mode"));
return true;
}
// no special circumstances, so insert the character without any fuss
insert(c, lastcode_);
lastcode_ = LM_TC_MIN;
return true;
}
MathCursorPos MathCursor::normalAnchor() const
{
if (Anchor_.size() < Cursor_.size()) {
Anchor_ = Cursor_;
lyxerr << "unusual Anchor size\n";
dump("1");
}
//lyx::Assert(Anchor_.size() >= Cursor_.size());
// use Anchor on the same level as Cursor
MathCursorPos normal = Anchor_[Cursor_.size() - 1];
if (Cursor_.size() < Anchor_.size() && !(normal < cursor())) {
// anchor is behind cursor -> move anchor behind the inset
++normal.pos_;
}
return normal;
}
void MathCursor::stripFromLastEqualSign()
{
// find position of last '=' in the array
MathArray & ar = cursor().cell();
MathArray::const_iterator et = ar.end();
for (MathArray::const_iterator it = ar.begin(); it != ar.end(); ++it)
if ((*it)->getChar() == '=')
et = it;
// delete everything behind this position
ar.erase(et - ar.begin(), ar.size());
pos() = ar.size();
}
void MathCursor::setSelection(cursor_type const & where, size_type n)
{
selection_ = true;
Anchor_ = where;
Cursor_ = where;
cursor().pos_ += n;
}