/** * \file InsetMathChar.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 * * Full author contact details are available in file CREDITS. */ #include #include "InsetMathChar.h" #include "MathParser.h" #include "MathSupport.h" #include "MathStream.h" #include "MetricsInfo.h" #include "Dimension.h" #include "BufferEncodings.h" #include "LaTeXFeatures.h" #include "TextPainter.h" #include "frontends/FontMetrics.h" #include "support/debug.h" #include "support/lstrings.h" #include "support/textutils.h" namespace lyx { extern bool has_math_fonts; namespace { latexkeys const * makeSubstitute(char_type c) { std::string name; switch (c) { // Latex replaces ', *, -, and : with specific symbols. With unicode-math, // these symbols are replaced respectively by ^U+2032, U+2217, U+2212 and // U+2236 (the latter substitution can be turned off with a package // option). Unicode-math also replaces ` with \backprime. // prime needs to be placed in superscript unless an opentype font is used. //case '\'': //name = "prime"; //break; case '*': name = "ast"; break; case '-': name = "lyxminus";// unicode-math: "minus" break; case ':': name = "ordinarycolon";// unicode-math: "mathratio" break; // The remaining replacements are not real character substitutions (from a // unicode point of view) but are done here: 1. for cosmetic reasons, in the // context of being stuck with CM fonts at the moment, to ensure consistency // with related symbols: -, \leq, \geq, etc. 2. to get the proper spacing // as defined in lib/symbols. case '+': name = "lyxplus";//unicode-math: "mathplus" break; case '>': name = "lyxgt";//unicode-math: "greater" break; case '<': name = "lyxlt";//unicode-math: "less" break; case '=': name = "lyxeqrel";//unicode-math: "equal" break; //case ','://unicode-math: "mathcomma" //case ';'://unicode-math: "mathsemicolon" default: return nullptr; } return in_word_set(from_ascii(name)); } } //anonymous namespace static bool slanted(char_type c) { return isAlphaASCII(c) || Encodings::isMathAlpha(c); } InsetMathChar::InsetMathChar(char_type c) : char_(c), kerning_(0), subst_(makeSubstitute(c)) {} Inset * InsetMathChar::clone() const { return new InsetMathChar(*this); } void InsetMathChar::metrics(MetricsInfo & mi, Dimension & dim) const { bool const mathfont = isMathFont(mi.base.fontname); if (mathfont && subst_) { // If the char has a substitute, draw the replacement symbol // instead, but only in math mode. mathedSymbolDim(mi.base, dim, subst_); kerning_ = mathed_char_kerning(mi.base.font, *subst_->draw.rbegin()); return; } else if (!slanted(char_) && mi.base.fontname == "mathnormal") { Changer dummy = mi.base.font.changeShape(UP_SHAPE); dim = theFontMetrics(mi.base.font).dimension(char_); } else { frontend::FontMetrics const & fm = theFontMetrics(mi.base.font); dim = fm.dimension(char_); kerning_ = fm.rbearing(char_) - dim.wid; } } void InsetMathChar::draw(PainterInfo & pi, int x, int y) const { //lyxerr << "drawing '" << char_ << "' font: " << pi.base.fontname << std::endl; if (isMathFont(pi.base.fontname)) { if (subst_) { // If the char has a substitute, draw the replacement symbol // instead, but only in math mode. mathedSymbolDraw(pi, x, y, subst_); return; } else if (!slanted(char_) && pi.base.fontname == "mathnormal") { Changer dummy = pi.base.font.changeShape(UP_SHAPE); pi.draw(x, y, char_); return; } } pi.draw(x, y, char_); } void InsetMathChar::metricsT(TextMetricsInfo const &, Dimension & dim) const { dim.wid = 1; dim.asc = 1; dim.des = 0; } void InsetMathChar::drawT(TextPainter & pain, int x, int y) const { //lyxerr << "drawing text '" << char_ << "' code: " << code_ << endl; pain.draw(x, y, char_); } void InsetMathChar::write(WriteStream & os) const { os.os().put(char_); } void InsetMathChar::validate(LaTeXFeatures & features) const { if (!isASCII(char_)) BufferEncodings::validate(char_, features, true); } void InsetMathChar::normalize(NormalStream & os) const { os << "[char "; os.os().put(char_); os << " mathalpha]"; } void InsetMathChar::octave(OctaveStream & os) const { os.os().put(char_); } // We have a bit of a problem here. MathML wants to know whether the // character represents an "identifier" or an "operator", and we have // no general way of telling. So we shall guess: If it's alpha or // mathalpha, then we'll treat it as an identifier, otherwise as an // operator. // Worst case: We get bad spacing, or bad italics. void InsetMathChar::mathmlize(MathStream & ms) const { std::string entity; switch (char_) { case '<': entity = "<"; break; case '>': entity = ">"; break; case '&': entity = "&"; break; case ' ': { ms << from_ascii(" "); return; } default: break; } if (ms.inText()) { if (entity.empty()) ms.os().put(char_); else ms << from_ascii(entity); return; } if (!entity.empty()) { ms << "" << from_ascii(entity) << ""; return; } char const * type = (isAlphaASCII(char_) || Encodings::isMathAlpha(char_)) ? "mi" : "mo"; // we don't use MTag and ETag because we do not want the spacing ms << "<" << type << ">" << char_type(char_) << ""; } void InsetMathChar::htmlize(HtmlStream & ms) const { std::string entity; // Not taking subst_ into account here because the MathML output of // <>=+-* looks correct as it is. FIXME: ' is not output as ^\prime switch (char_) { case '<': entity = "<"; break; case '>': entity = ">"; break; case '&': entity = "&"; break; case ' ': entity = " "; break; default: break; } bool have_entity = !entity.empty(); if (ms.inText()) { if (have_entity) ms << from_ascii(entity); else ms.os().put(char_); return; } if (have_entity) { // an operator, so give some space ms << ' ' << from_ascii(entity) << ' '; return; } if (isAlphaASCII(char_) || Encodings::isMathAlpha(char_)) // we don't use MTag and ETag because we do not want the spacing ms << MTag("i") << char_type(char_) << ETag("i"); else // an operator, so give some space ms << " " << char_type(char_) << " "; } MathClass InsetMathChar::mathClass() const { // this information comes from fontmath.ltx in LaTeX source. char const ch = static_cast(char_); if (subst_) return string_to_class(subst_->extra); else if (support::contains(",;", ch)) return MC_PUNCT; else if (support::contains("([", ch)) return MC_OPEN; else if (support::contains(")]!?", ch)) return MC_CLOSE; else return MC_ORD; } } // namespace lyx