X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Fmathed%2FInsetMathFrac.cpp;h=90d61913a678236f8582b2b2fb3cb61da1ee1195;hb=014227cc402deb0b8afad0ffd716b8c828373a03;hp=9a244eaa34594a69c7da531eae0882bf4767405c;hpb=07aca7ccccb44193c611a0b4e679633597c9327f;p=lyx.git diff --git a/src/mathed/InsetMathFrac.cpp b/src/mathed/InsetMathFrac.cpp index 9a244eaa34..90d61913a6 100644 --- a/src/mathed/InsetMathFrac.cpp +++ b/src/mathed/InsetMathFrac.cpp @@ -14,18 +14,24 @@ #include "InsetMathFrac.h" -#include "Cursor.h" -#include "LaTeXFeatures.h" #include "MathData.h" +#include "MathParser.h" #include "MathStream.h" #include "MathSupport.h" + +#include "Cursor.h" +#include "LaTeXFeatures.h" #include "MetricsInfo.h" #include "TextPainter.h" +#include "frontends/FontMetrics.h" #include "frontends/Painter.h" +#include "support/lassert.h" + using namespace std; + namespace lyx { ///////////////////////////////////////////////////////////////////// @@ -120,148 +126,237 @@ bool InsetMathFrac::idxBackward(Cursor & cur) const } +MathClass InsetMathFrac::mathClass() const +{ + // Generalized fractions are of inner class (see The TeXbook, p. 292) + // But stuff from the unit/nicefrac packages are not real fractions. + MathClass mc = MC_ORD; + switch (kind_) { + case ATOP: + case OVER: + case FRAC: + case DFRAC: + case TFRAC: + case CFRAC: + case CFRACLEFT: + case CFRACRIGHT: + mc = MC_INNER; + break; + case NICEFRAC: + case UNITFRAC: + case UNIT: + break; + } + return mc; +} + + + +namespace { + +// align the top of M in the cell with the top of M in the surrounding font +int dy_for_nicefrac(MetricsBase & mb) +{ + // this is according to nicefrac.sty + int big_m = theFontMetrics(mb.font).ascent('M'); + Changer dummy = mb.changeScript(); + int small_m = theFontMetrics(mb.font).ascent('M'); + return big_m - small_m; +} + + +// symbol for nicefrac solidus +latexkeys const * slash_symbol() +{ + return in_word_set(from_ascii("slash")); +} + +} // namespace + + void InsetMathFrac::metrics(MetricsInfo & mi, Dimension & dim) const { Dimension dim0, dim1, dim2; + Changer dummy3 = mi.base.changeEnsureMath(); - if (kind_ == UNIT || (kind_ == UNITFRAC && nargs() == 3)) { - if (nargs() == 1) { - ShapeChanger dummy2(mi.base.font, 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); - ShapeChanger dummy2(mi.base.font, 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 { + switch (kind_) { + case UNIT: { + // \unitone, \unittwo + dim.wid = 0; + int unit_cell = 0; + // is there an extra cell holding the value being given a dimension? + // (this is \unittwo) + if (nargs() == 2) { + cell(0).metrics(mi, dim1); + dim.wid += dim1.wid + 4; + unit_cell = 1; + } + Changer dummy = mi.base.font.changeShape(UP_SHAPE); + cell(unit_cell).metrics(mi, dim0); + dim.wid += dim0.width() + 1; + dim.asc = max(dim0.asc, dim1.asc); + dim.des = max(dim0.des, dim1.des); + } + break; + + case UNITFRAC: + case NICEFRAC: { + // \unitfrac, \unitfracthree, \nicefrac + dim.wid = 0; + dim.asc = 0; + dim.des = 0; + int const dy = dy_for_nicefrac(mi.base); + // is there an extra cell holding the value being given a dimension? + // (this is \unitfracthree) + if (kind_ == UNITFRAC && nargs() == 3) { cell(2).metrics(mi, dim2); - ShapeChanger dummy2(mi.base.font, UP_SHAPE); - FracChanger dummy(mi.base); - 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); + dim.wid += dim2.wid + 4; + dim.asc = dim2.asc; + dim.des = dim2.des; + } + Changer dummy = (kind_ == UNITFRAC) ? mi.base.font.changeShape(UP_SHAPE) + : Changer(); + Changer dummy2 = mi.base.changeScript(); + if (latexkeys const * slash = slash_symbol()) { + Dimension dimslash; + mathedSymbolDim(mi.base, dimslash, slash); + dim.wid += dimslash.wid - mathed_mu(mi.base.font, 3.0); + dim.asc = max(dim.asc, dimslash.asc); + dim.des = max(dim.des, dimslash.des); } - } else { - // general cell metrics used for \frac - FracChanger dummy(mi.base); 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) { - dim.wid = dim0.width() + dim1.wid + 5; - dim.asc = dim0.height() + 5; - dim.des = dim1.height() - 5; - } else if (kind_ == UNITFRAC) { - ShapeChanger dummy2(mi.base.font, UP_SHAPE); - 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) { - // \cfrac and \dfrac are always in display size - StyleChanger dummy2(mi.base, LM_ST_DISPLAY); - cell(0).metrics(mi, dim0); - cell(1).metrics(mi, dim1); - } else if (kind_ == TFRAC) { - // tfrac is in always in text size - StyleChanger dummy2(mi.base, LM_ST_SCRIPT); - 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; - } + dim.wid += dim0.wid + dim1.wid + 2; + dim.asc = max(max(dim.asc, dim0.asc + dy), dim1.asc); + dim.des = max(max(dim.des, dim0.des - dy), dim1.des); + } + break; + + case FRAC: + case CFRAC: + case CFRACLEFT: + case CFRACRIGHT: + case DFRAC: + case TFRAC: + case OVER: + case ATOP: { + int const dy = axis_height(mi.base); + Changer dummy = + // \tfrac is always in text size + (kind_ == TFRAC) ? mi.base.font.changeStyle(LM_ST_SCRIPT) : + // \cfrac and \dfrac are always in display size + (kind_ == CFRAC + || kind_ == CFRACLEFT + || kind_ == CFRACRIGHT + || kind_ == DFRAC) ? mi.base.font.changeStyle(LM_ST_DISPLAY) : + // all others + mi.base.changeFrac(); + Changer dummy2 = mi.base.changeEnsureMath(); + cell(0).metrics(mi, dim0); + cell(1).metrics(mi, dim1); + dim.wid = max(dim0.wid, dim1.wid) + 2; + dim.asc = dim0.height() + dy/2 + dy; + int const t = mi.base.solidLineThickness(); + dim.des = max(0, dim1.height() + dy/2 - dy + t); } - metricsMarkers(dim); + } //switch (kind_) } void InsetMathFrac::draw(PainterInfo & pi, int x, int y) const { - setPosCache(pi, x, y); + Changer dummy3 = pi.base.changeEnsureMath(); 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) { - ShapeChanger dummy2(pi.base.font, UP_SHAPE); - cell(0).draw(pi, x + 1, y); - } else if (nargs() == 2) { - cell(0).draw(pi, x + 1, y); - ShapeChanger dummy2(pi.base.font, UP_SHAPE); - cell(1).draw(pi, x + dim0.width() + 5, y); - } else { - cell(2).draw(pi, x + 1, y); - ShapeChanger dummy2(pi.base.font, UP_SHAPE); - FracChanger dummy(pi.base); - 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 { - FracChanger dummy(pi.base); - 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) { - ShapeChanger dummy2(pi.base.font, 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) { - 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 if (kind_ == TFRAC) { - // tfrac is in always in text size - StyleChanger dummy2(pi.base, LM_ST_SCRIPT); - 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 - StyleChanger dummy2(pi.base, 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); + switch (kind_) { + case UNIT: { + // \unitone, \unittwo + int xx = x; + int unit_cell = 0; + // is there an extra cell holding the value being given a dimension? + // (this is \unittwo) + if (nargs() == 2) { + cell(0).draw(pi, x, y); + xx += dim0.wid + 4; + unit_cell = 1; } + Changer dummy = pi.base.font.changeShape(UP_SHAPE); + cell(unit_cell).draw(pi, xx, y); } - if (kind_ == NICEFRAC || kind_ == UNITFRAC) { - // Diag line: + break; + + case UNITFRAC: + case NICEFRAC: { + // \unitfrac, \unitfracthree, \nicefrac 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, Color_math); + int const dy = dy_for_nicefrac(pi.base); + // is there an extra cell holding the value being given a dimension? + // (this is \unitfracthree) + if (kind_ == UNITFRAC && nargs() == 3) { + cell(2).draw(pi, x, y); + xx += cell(2).dimension(*pi.base.bv).wid + 4; + } + Changer dummy = (kind_ == UNITFRAC) ? pi.base.font.changeShape(UP_SHAPE) + : Changer(); + // nice fraction + Changer dummy2 = pi.base.changeScript(); + cell(0).draw(pi, xx + 1, y - dy); + // reference LaTeX code from nicefrac.sty: + // \mkern-2mu/\mkern-1mu + if (latexkeys const * slash = slash_symbol()) { + int mkern = mathed_mu(pi.base.font, 2.0); + mathedSymbolDraw(pi, xx + 1 + dim0.wid - mkern, y, slash); + Dimension dimslash; + mathedSymbolDim(pi.base, dimslash, slash); + xx += dimslash.wid - mathed_mu(pi.base.font, 3.0); + } + cell(1).draw(pi, xx + 1 + dim0.wid, y); } - 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, Color_math); - drawMarkers(pi, x, y); + break; + + case FRAC: + case CFRAC: + case CFRACLEFT: + case CFRACRIGHT: + case DFRAC: + case TFRAC: + case OVER: + case ATOP: { + int const dy = axis_height(pi.base); + Changer dummy = + // \tfrac is always in text size + (kind_ == TFRAC) ? pi.base.font.changeStyle(LM_ST_SCRIPT) : + // \cfrac and \dfrac are always in display size + (kind_ == CFRAC + || kind_ == CFRACLEFT + || kind_ == CFRACRIGHT + || kind_ == DFRAC) ? pi.base.font.changeStyle(LM_ST_DISPLAY) : + // all others + pi.base.changeFrac(); + Dimension const dim1 = cell(1).dimension(*pi.base.bv); + int const m = x + dim.wid / 2; + int const xx = + // align left + (kind_ == CFRACLEFT) ? x + 1 : + // align right + (kind_ == CFRACRIGHT) ? x + dim.wid - dim0.wid - 2 : + // center + m - dim0.wid / 2; + int const t = pi.base.solidLineThickness(); + // take dy/2 for the spacing around the horizontal line. This is + // arbitrary. In LaTeX it is more complicated to ensure that displayed + // fractions line up next to each other. + // For more accurate implementation refer to the TeXbook, Appendix G, + // rules 15a-e. + cell(0).draw(pi, xx, y - dim0.des - dy/2 - dy); + // center + cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + dy/2 - dy + t); + // horizontal line + if (kind_ != ATOP) + pi.pain.line(x, y - dy, x + dim.wid, y - dy, + pi.base.font.color(), pi.pain.line_solid, t); + } + } //switch (kind_) } @@ -368,28 +463,137 @@ bool InsetMathFrac::extraBraces() const 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 { - os << MTag("mfrac") - << MTag("mrow") << cell(0) << ETag("mrow") - << MTag("mrow") << cell(1) << ETag("mrow") - << ETag("mfrac"); + 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"); + } } @@ -398,8 +602,14 @@ 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) + || 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); } @@ -435,35 +645,28 @@ int InsetMathBinom::dw(int height) const void InsetMathBinom::metrics(MetricsInfo & mi, Dimension & dim) const { + Changer dummy2 = mi.base.changeEnsureMath(); Dimension dim0, dim1; - - // FIXME: for an unknown reason the cells must be set directly - // after the StyleChanger and cannot be set after the if case - if (kind_ == DBINOM) { - StyleChanger dummy(mi.base, LM_ST_DISPLAY); - cell(0).metrics(mi, dim0); - cell(1).metrics(mi, dim1); - } else if (kind_ == TBINOM) { - StyleChanger dummy(mi.base, LM_ST_SCRIPT); - cell(0).metrics(mi, dim0); - cell(1).metrics(mi, dim1); - } else { - FracChanger dummy(mi.base); - cell(0).metrics(mi, dim0); - cell(1).metrics(mi, dim1); - } - dim.asc = dim0.height() + 4 + 5; - dim.des = dim1.height() + 4 - 5; + int const dy = axis_height(mi.base); + Changer dummy = + (kind_ == DBINOM) ? mi.base.font.changeStyle(LM_ST_DISPLAY) : + (kind_ == TBINOM) ? mi.base.font.changeStyle(LM_ST_SCRIPT) : + mi.base.changeFrac(); + cell(0).metrics(mi, dim0); + cell(1).metrics(mi, dim1); + dim.asc = dim0.height() + 1 + dy/2 + dy; + dim.des = max(0, dim1.height() + 1 + dy/2 - dy); dim.wid = max(dim0.wid, dim1.wid) + 2 * dw(dim.height()) + 4; - metricsMarkers2(dim); } void InsetMathBinom::draw(PainterInfo & pi, int x, int y) const { + Changer dummy2 = pi.base.changeEnsureMath(); 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); + int const dy = axis_height(pi.base); // define the binom brackets docstring const bra = kind_ == BRACE ? from_ascii("{") : kind_ == BRACK ? from_ascii("[") : from_ascii("("); @@ -471,27 +674,21 @@ void InsetMathBinom::draw(PainterInfo & pi, int x, int y) const kind_ == BRACK ? from_ascii("]") : from_ascii(")"); int m = x + dim.width() / 2; - // FIXME: for an unknown reason the cells must be drawn directly - // after the StyleChanger and cannot be drawn after the if case - if (kind_ == DBINOM) { - StyleChanger dummy(pi.base, LM_ST_DISPLAY); - 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); - } else if (kind_ == TBINOM) { - StyleChanger dummy(pi.base, LM_ST_SCRIPT); - 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); - } else { - FracChanger dummy2(pi.base); - 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); + { + Changer dummy = + (kind_ == DBINOM) ? pi.base.font.changeStyle(LM_ST_DISPLAY) : + (kind_ == TBINOM) ? pi.base.font.changeStyle(LM_ST_SCRIPT) : + pi.base.changeFrac(); + // take dy both for the vertical alignment and for the spacing between + // cells + cell(0).draw(pi, m - dim0.wid / 2, y - dim0.des - dy/2 - dy); + cell(1).draw(pi, m - dim1.wid / 2, y + dim1.asc + dy/2 - dy); } // 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); } @@ -562,12 +759,48 @@ void InsetMathBinom::mathmlize(MathStream & os) const } +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 (kind_ == BINOM) - features.require("binom"); - if (kind_ == DBINOM || kind_ == TBINOM) - features.require("amsmath"); + 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); }