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lyx_mirror/src/mathed/InsetMathFrac.cpp
Guillaume Munch e2bc7ffae3 RefChanger 
RefChanger temporarily assigns a value to a non-const reference of any
kind. RefChanger provides a flexible and uniform generalisation of the various
scope guards previously derived from the old Changer class in MetricsInfo.h.

As before, a temporary assignment lasts as long as the Changer object lives. But
the new Changer is movable. In particular, contorsions are no longer needed to
change a private field. Special code can be moved into the appropriate classes,
and it is no longer necessary to create a new class for each specific use.

Syntax change:

   FontSetChanger dummy(mi.base, value);
-> Changer dummy = mi.base.changeFontSet(value);

New function for generating arbitrary Changers:

  Changer dummy = make_change(ref, val, condition);

Bugfix:

* Fix the display of \displaystyle{\substack{\frac{xyz}{}}} (missing style
  change).
2016-06-13 08:46:15 +01:00

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/**
* \file InsetMathFracBase.cpp
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Alejandro Aguilar Sierra
* \author André Pönitz
* \author Uwe Stöhr
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "InsetMathFrac.h"
#include "Cursor.h"
#include "LaTeXFeatures.h"
#include "MathData.h"
#include "MathStream.h"
#include "MathSupport.h"
#include "MetricsInfo.h"
#include "TextPainter.h"
#include "frontends/Painter.h"
#include "support/lassert.h"
using namespace std;
namespace lyx {
/////////////////////////////////////////////////////////////////////
//
// InsetMathFracBase
//
/////////////////////////////////////////////////////////////////////
InsetMathFracBase::InsetMathFracBase(Buffer * buf, idx_type ncells)
: InsetMathNest(buf, ncells)
{}
bool InsetMathFracBase::idxUpDown(Cursor & cur, bool up) const
{
// If we only have one cell, target = 0, otherwise
// target = up ? 0 : 1, since upper cell has idx 0
InsetMath::idx_type target = nargs() > 1 ? !up : 0;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
/////////////////////////////////////////////////////////////////////
//
// InsetMathFrac
//
/////////////////////////////////////////////////////////////////////
InsetMathFrac::InsetMathFrac(Buffer * buf, Kind kind, InsetMath::idx_type ncells)
: InsetMathFracBase(buf, ncells), kind_(kind)
{}
Inset * InsetMathFrac::clone() const
{
return new InsetMathFrac(*this);
}
InsetMathFrac * InsetMathFrac::asFracInset()
{
return kind_ == ATOP ? 0 : this;
}
InsetMathFrac const * InsetMathFrac::asFracInset() const
{
return kind_ == ATOP ? 0 : this;
}
bool InsetMathFrac::idxForward(Cursor & cur) const
{
InsetMath::idx_type target = 0;
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 3)
target = 0;
else if (nargs() == 2)
target = 1;
} else
return false;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
bool InsetMathFrac::idxBackward(Cursor & cur) const
{
InsetMath::idx_type target = 0;
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 3)
target = 2;
else if (nargs() == 2)
target = 0;
} else
return false;
if (cur.idx() == target)
return false;
cur.idx() = target;
cur.pos() = cell(target).x2pos(&cur.bv(), cur.x_target());
return true;
}
void InsetMathFrac::metrics(MetricsInfo & mi, Dimension & dim) const
{
Dimension dim0, dim1, dim2;
// This could be simplified, including avoiding useless recalculation of
// cell metrics
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 1) {
Changer dummy = mi.base.font.changeShape(UP_SHAPE);
cell(0).metrics(mi, dim0);
dim.wid = dim0.width()+ 3;
dim.asc = dim0.asc;
dim.des = dim0.des;
} else if (nargs() == 2) {
cell(0).metrics(mi, dim0);
Changer dummy = mi.base.font.changeShape(UP_SHAPE);
cell(1).metrics(mi, dim1);
dim.wid = dim0.width() + dim1.wid + 5;
dim.asc = max(dim0.asc, dim1.asc);
dim.des = max(dim0.des, dim1.des);
} else {
cell(2).metrics(mi, dim2);
Changer dummy = mi.base.font.changeShape(UP_SHAPE);
Changer dummy2 = mi.base.changeFrac();
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
dim.wid = dim0.width() + dim1.wid + dim2.wid + 10;
dim.asc = max(dim2.asc, dim0.height() + 5);
dim.des = max(dim2.des, dim1.height() - 5);
}
} else {
// general cell metrics used for \frac
Changer dummy = mi.base.changeFrac();
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
if (nargs() == 3)
cell(2).metrics(mi, dim2);
// metrics for special fraction types
if (kind_ == NICEFRAC || kind_ == UNITFRAC) {
Changer dummy2 = mi.base.font.changeShape(UP_SHAPE, kind_ == UNITFRAC);
dim.wid = dim0.width() + dim1.wid + 5;
dim.asc = dim0.height() + 5;
dim.des = dim1.height() - 5;
} else {
if (kind_ == CFRAC || kind_ == CFRACLEFT || kind_ == CFRACRIGHT
|| kind_ == DFRAC || kind_ == TFRAC) {
// \cfrac and \dfrac are always in display size
// \tfrac is in always in text size
Changer dummy2 = mi.base.changeStyle((kind_ == TFRAC)
? LM_ST_SCRIPT
: LM_ST_DISPLAY);
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
}
dim.wid = max(dim0.wid, dim1.wid) + 2;
dim.asc = dim0.height() + 2 + 5;
dim.des = dim1.height() + 2 - 5;
}
}
metricsMarkers(dim);
}
void InsetMathFrac::draw(PainterInfo & pi, int x, int y) const
{
setPosCache(pi, x, y);
Dimension const dim = dimension(*pi.base.bv);
Dimension const dim0 = cell(0).dimension(*pi.base.bv);
if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) {
if (nargs() == 1) {
Changer dummy = pi.base.font.changeShape(UP_SHAPE);
cell(0).draw(pi, x + 1, y);
} else if (nargs() == 2) {
cell(0).draw(pi, x + 1, y);
Changer dummy = pi.base.font.changeShape(UP_SHAPE);
cell(1).draw(pi, x + dim0.width() + 5, y);
} else {
cell(2).draw(pi, x + 1, y);
Changer dummy = pi.base.font.changeShape(UP_SHAPE);
Changer dummy2 = pi.base.changeFrac();
Dimension const dim1 = cell(1).dimension(*pi.base.bv);
Dimension const dim2 = cell(2).dimension(*pi.base.bv);
int xx = x + dim2.wid + 5;
cell(0).draw(pi, xx + 2,
y - dim0.des - 5);
cell(1).draw(pi, xx + dim0.width() + 5,
y + dim1.asc / 2);
}
} else {
Changer dummy = pi.base.changeFrac();
Dimension const dim1 = cell(1).dimension(*pi.base.bv);
int m = x + dim.wid / 2;
if (kind_ == NICEFRAC) {
cell(0).draw(pi, x + 2,
y - dim0.des - 5);
cell(1).draw(pi, x + dim0.width() + 5,
y + dim1.asc / 2);
} else if (kind_ == UNITFRAC) {
Changer dummy2 = pi.base.font.changeShape(UP_SHAPE);
cell(0).draw(pi, x + 2, y - dim0.des - 5);
cell(1).draw(pi, x + dim0.width() + 5, y + dim1.asc / 2);
} else if (kind_ == FRAC || kind_ == ATOP || kind_ == OVER
|| kind_ == TFRAC) {
// tfrac is in always in text size
Changer dummy2 = pi.base.changeStyle(LM_ST_SCRIPT, kind_ == TFRAC);
cell(0).draw(pi, m - dim0.wid / 2, y - dim0.des - 2 - 5);
cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + 2 - 5);
} else {
// \cfrac and \dfrac are always in display size
Changer dummy2 = pi.base.changeStyle(LM_ST_DISPLAY);
if (kind_ == CFRAC || kind_ == DFRAC)
cell(0).draw(pi, m - dim0.wid / 2, y - dim0.des - 2 - 5);
else if (kind_ == CFRACLEFT)
cell(0).draw(pi, x + 2, y - dim0.des - 2 - 5);
else if (kind_ == CFRACRIGHT)
cell(0).draw(pi, x + dim.wid - dim0.wid - 2,
y - dim0.des - 2 - 5);
cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + 2 - 5);
}
}
if (kind_ == NICEFRAC || kind_ == UNITFRAC) {
// Diag line:
int xx = x;
if (nargs() == 3)
xx += cell(2).dimension(*pi.base.bv).wid + 5;
pi.pain.line(xx + dim0.wid,
y + dim.des - 2,
xx + dim0.wid + 5,
y - dim.asc + 2, pi.base.font.color());
}
if (kind_ == FRAC || kind_ == CFRAC || kind_ == CFRACLEFT
|| kind_ == CFRACRIGHT || kind_ == DFRAC
|| kind_ == TFRAC || kind_ == OVER)
pi.pain.line(x + 1, y - 5,
x + dim.wid - 2, y - 5, pi.base.font.color());
drawMarkers(pi, x, y);
}
void InsetMathFrac::metricsT(TextMetricsInfo const & mi, Dimension & dim) const
{
Dimension dim0, dim1;
cell(0).metricsT(mi, dim0);
cell(1).metricsT(mi, dim1);
dim.wid = max(dim0.width(), dim1.wid);
dim.asc = dim0.height() + 1;
dim.des = dim1.height();
}
void InsetMathFrac::drawT(TextPainter & /*pain*/, int /*x*/, int /*y*/) const
{
// FIXME: BROKEN!
/*
Dimension dim;
int m = x + dim.width() / 2;
cell(0).drawT(pain, m - dim0.width() / 2, y - dim0.des - 1);
cell(1).drawT(pain, m - dim1.wid / 2, y + dim1.asc);
// ASCII art: ignore niceties
if (kind_ == FRAC || kind_ == OVER || kind_ == NICEFRAC || kind_ == UNITFRAC)
pain.horizontalLine(x, y, dim.width());
*/
}
void InsetMathFrac::write(WriteStream & os) const
{
MathEnsurer ensurer(os);
switch (kind_) {
case ATOP:
// \\atop is only for compatibility, \\binom is the
// LaTeX2e successor
os << '{' << cell(0) << "\\atop " << cell(1) << '}';
break;
case OVER:
// \\over is only for compatibility, normalize this to \\frac
os << "\\frac{" << cell(0) << "}{" << cell(1) << '}';
break;
case FRAC:
case DFRAC:
case TFRAC:
case NICEFRAC:
case CFRAC:
case UNITFRAC:
if (nargs() == 2)
InsetMathNest::write(os);
else
os << "\\unitfrac[" << cell(2) << "]{" << cell(0) << "}{" << cell(1) << '}';
break;
case UNIT:
if (nargs() == 2)
os << "\\unit[" << cell(0) << "]{" << cell(1) << '}';
else
os << "\\unit{" << cell(0) << '}';
break;
case CFRACLEFT:
os << "\\cfrac[l]{" << cell(0) << "}{" << cell(1) << '}';
break;
case CFRACRIGHT:
os << "\\cfrac[r]{" << cell(0) << "}{" << cell(1) << '}';
break;
}
}
docstring InsetMathFrac::name() const
{
switch (kind_) {
case FRAC:
return from_ascii("frac");
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
return from_ascii("cfrac");
case DFRAC:
return from_ascii("dfrac");
case TFRAC:
return from_ascii("tfrac");
case OVER:
return from_ascii("over");
case NICEFRAC:
return from_ascii("nicefrac");
case UNITFRAC:
return from_ascii("unitfrac");
case UNIT:
return from_ascii("unit");
case ATOP:
return from_ascii("atop");
}
// shut up stupid compiler
return docstring();
}
bool InsetMathFrac::extraBraces() const
{
return kind_ == ATOP || kind_ == OVER;
}
void InsetMathFrac::maple(MapleStream & os) const
{
if (nargs() != 2) {
// Someone who knows about maple should fix this.
LASSERT(false, return);
}
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::mathematica(MathematicaStream & os) const
{
if (nargs() != 2) {
// Someone who knows about mathematica should fix this.
LASSERT(false, return);
}
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::octave(OctaveStream & os) const
{
if (nargs() != 2) {
// Someone who knows about octave should fix this.
LASSERT(false, return);
}
os << '(' << cell(0) << ")/(" << cell(1) << ')';
}
void InsetMathFrac::mathmlize(MathStream & os) const
{
switch (kind_) {
case ATOP:
os << MTag("mfrac", "linethickeness='0'")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
// we do not presently distinguish these
case OVER:
case FRAC:
case DFRAC:
case TFRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
os << MTag("mfrac")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
case NICEFRAC:
os << MTag("mfrac", "bevelled='true'")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
case UNITFRAC:
if (nargs() == 3)
os << cell(2);
os << MTag("mfrac", "bevelled='true'")
<< MTag("mrow") << cell(0) << ETag("mrow")
<< MTag("mrow") << cell(1) << ETag("mrow")
<< ETag("mfrac");
break;
case UNIT:
// FIXME This is not right, because we still output mi, etc,
// when we output the cell. So we need to prevent that somehow.
if (nargs() == 2)
os << cell(0)
<< MTag("mstyle mathvariant='normal'")
<< cell(1)
<< ETag("mstyle");
else
os << MTag("mstyle mathvariant='normal'")
<< cell(0)
<< ETag("mstyle");
}
}
void InsetMathFrac::htmlize(HtmlStream & os) const
{
switch (kind_) {
case ATOP:
os << MTag("span", "class='frac'")
<< MTag("span", "class='numer'") << cell(0) << ETag("span")
<< MTag("span", "class='numer'") << cell(1) << ETag("span")
<< ETag("span");
break;
// we do not presently distinguish these
case OVER:
case FRAC:
case DFRAC:
case TFRAC:
case CFRAC:
case CFRACLEFT:
case CFRACRIGHT:
os << MTag("span", "class='frac'")
<< MTag("span", "class='numer'") << cell(0) << ETag("span")
<< MTag("span", "class='denom'") << cell(1) << ETag("span")
<< ETag("span");
break;
case NICEFRAC:
os << cell(0) << '/' << cell(1);
break;
case UNITFRAC:
if (nargs() == 3)
os << cell(2) << ' ';
os << cell(0) << '/' << cell(1);
break;
case UNIT:
// FIXME This is not right, because we still output i, etc,
// when we output the cell. So we need to prevent that somehow.
if (nargs() == 2)
os << cell(0)
<< MTag("span")
<< cell(1)
<< ETag("span");
else
os << MTag("span")
<< cell(0)
<< ETag("span");
}
}
void InsetMathFrac::validate(LaTeXFeatures & features) const
{
if (kind_ == NICEFRAC || kind_ == UNITFRAC || kind_ == UNIT)
features.require("units");
if (kind_ == CFRAC || kind_ == CFRACLEFT || kind_ == CFRACRIGHT
|| kind_ == DFRAC || kind_ == TFRAC)
features.require("amsmath");
if (features.runparams().math_flavor == OutputParams::MathAsHTML)
// CSS adapted from eLyXer
features.addCSSSnippet(
"span.frac{display: inline-block; vertical-align: middle; text-align:center;}\n"
"span.numer{display: block;}\n"
"span.denom{display: block; border-top: thin solid #000040;}");
InsetMathNest::validate(features);
}
/////////////////////////////////////////////////////////////////////
//
// InsetMathBinom
//
/////////////////////////////////////////////////////////////////////
InsetMathBinom::InsetMathBinom(Buffer * buf, Kind kind)
: InsetMathFracBase(buf), kind_(kind)
{}
Inset * InsetMathBinom::clone() const
{
return new InsetMathBinom(*this);
}
int InsetMathBinom::dw(int height) const
{
int w = height / 5;
if (w > 15)
w = 15;
if (w < 6)
w = 6;
return w;
}
void InsetMathBinom::metrics(MetricsInfo & mi, Dimension & dim) const
{
Dimension dim0, dim1;
Changer dummy =
(kind_ == DBINOM) ? mi.base.changeStyle(LM_ST_DISPLAY) :
(kind_ == TBINOM) ? mi.base.changeStyle(LM_ST_SCRIPT) :
mi.base.changeFrac();
cell(0).metrics(mi, dim0);
cell(1).metrics(mi, dim1);
dim.asc = dim0.height() + 4 + 5;
dim.des = dim1.height() + 4 - 5;
dim.wid = max(dim0.wid, dim1.wid) + 2 * dw(dim.height()) + 4;
metricsMarkers2(dim);
}
void InsetMathBinom::draw(PainterInfo & pi, int x, int y) const
{
Dimension const dim = dimension(*pi.base.bv);
Dimension const & dim0 = cell(0).dimension(*pi.base.bv);
Dimension const & dim1 = cell(1).dimension(*pi.base.bv);
// define the binom brackets
docstring const bra = kind_ == BRACE ? from_ascii("{") :
kind_ == BRACK ? from_ascii("[") : from_ascii("(");
docstring const ket = kind_ == BRACE ? from_ascii("}") :
kind_ == BRACK ? from_ascii("]") : from_ascii(")");
int m = x + dim.width() / 2;
{
Changer dummy =
(kind_ == DBINOM) ? pi.base.changeStyle(LM_ST_DISPLAY) :
(kind_ == TBINOM) ? pi.base.changeStyle(LM_ST_SCRIPT) :
pi.base.changeFrac();
cell(0).draw(pi, m - dim0.wid / 2, y - dim0.des - 3 - 5);
cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + 3 - 5);
}
// draw the brackets and the marker
mathed_draw_deco(pi, x, y - dim.ascent(), dw(dim.height()),
dim.height(), bra);
mathed_draw_deco(pi, x + dim.width() - dw(dim.height()),
y - dim.ascent(), dw(dim.height()), dim.height(), ket);
drawMarkers2(pi, x, y);
}
bool InsetMathBinom::extraBraces() const
{
return kind_ == CHOOSE || kind_ == BRACE || kind_ == BRACK;
}
void InsetMathBinom::write(WriteStream & os) const
{
MathEnsurer ensurer(os);
switch (kind_) {
case BINOM:
os << "\\binom{" << cell(0) << "}{" << cell(1) << '}';
break;
case DBINOM:
os << "\\dbinom{" << cell(0) << "}{" << cell(1) << '}';
break;
case TBINOM:
os << "\\tbinom{" << cell(0) << "}{" << cell(1) << '}';
break;
case CHOOSE:
os << '{' << cell(0) << " \\choose " << cell(1) << '}';
break;
case BRACE:
os << '{' << cell(0) << " \\brace " << cell(1) << '}';
break;
case BRACK:
os << '{' << cell(0) << " \\brack " << cell(1) << '}';
break;
}
}
void InsetMathBinom::normalize(NormalStream & os) const
{
os << "[binom " << cell(0) << ' ' << cell(1) << ']';
}
void InsetMathBinom::mathmlize(MathStream & os) const
{
char ldelim = ' ';
char rdelim = ' ';
switch (kind_) {
case BINOM:
case TBINOM:
case DBINOM:
case CHOOSE:
ldelim = '(';
rdelim = ')';
break;
case BRACE:
ldelim = '{';
rdelim = '}';
break;
case BRACK:
ldelim = '[';
rdelim = ']';
break;
}
os << "<mo fence='true' stretchy='true' form='prefix'>" << ldelim << "</mo>"
<< "<mfrac linethickness='0'>"
<< cell(0) << cell(1)
<< "</mfrac>"
<< "<mo fence='true' stretchy='true' form='postfix'>" << rdelim << "</mo>";
}
void InsetMathBinom::htmlize(HtmlStream & os) const
{
char ldelim = ' ';
char rdelim = ' ';
switch (kind_) {
case BINOM:
case TBINOM:
case DBINOM:
case CHOOSE:
ldelim = '(';
rdelim = ')';
break;
case BRACE:
ldelim = '{';
rdelim = '}';
break;
case BRACK:
ldelim = '[';
rdelim = ']';
break;
}
os << MTag("span", "class='binomdelim'") << ldelim << ETag("span") << '\n'
<< MTag("span", "class='binom'") << '\n'
<< MTag("span") << cell(0) << ETag("span") << '\n'
<< MTag("span") << cell(1) << ETag("span") << '\n'
<< ETag("span") << '\n'
<< MTag("span", "class='binomdelim'") << rdelim << ETag("span") << '\n';
}
void InsetMathBinom::validate(LaTeXFeatures & features) const
{
if (features.runparams().isLaTeX()) {
if (kind_ == BINOM)
features.require("binom");
if (kind_ == DBINOM || kind_ == TBINOM)
features.require("amsmath");
} else if (features.runparams().math_flavor == OutputParams::MathAsHTML)
features.addCSSSnippet(
"span.binom{display: inline-block; vertical-align: bottom; text-align:center;}\n"
"span.binom span{display: block;}\n"
"span.binomdelim{font-size: 2em;}");
InsetMathNest::validate(features);
}
} // namespace lyx
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