The beginnings of pure HTML output of math, for our internal XHTML

output routines. The idea is that in some cases people may not want to
use MathML, so we are going to try to give options.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@33936 a592a061-630c-0410-9148-cb99ea01b6c8

src/mathed/InsetMath.cpp

@@ -130,6 +130,16 @@ void InsetMath::mathmlize(MathStream & os) const
 }
 
 
+void InsetMath::htmlize(HtmlStream & os) const
+{
+	os << "<!-- " << from_utf8(insetName(lyxCode())) << " -->";
+	os << MTag("span", "style='color: red;'");
+	NormalStream ns(os.os());
+	normalize(ns);
+	os << ETag("span");
+}
+
+
 HullType InsetMath::getType() const
 {
 	return hullNone;

src/mathed/InsetMath.h

@@ -73,6 +73,7 @@ class InsetMathUnknown;
 
 class InsetMathRef;
 
+class HtmlStream;
 class NormalStream;
 class OctaveStream;
 class MapleStream;
@@ -186,8 +187,13 @@ public:
 	virtual void maxima(MaximaStream &) const;
 	/// write content as something readable by Mathematica
 	virtual void mathematica(MathematicaStream &) const;
-	/// write content as something resembling MathML
+	/// write content as MathML
 	virtual void mathmlize(MathStream &) const;
+	/// write content as HTML, best we can.
+	/// the idea for this, and some of the details, come from
+	/// eLyXer, written by Alex Fernandez. no code is borrowed. rather,
+	/// we try to mimic how eLyXer outputs some math.
+	virtual void htmlize(HtmlStream &) const;
 	/// write content as something readable by Octave
 	virtual void octave(OctaveStream &) const;
 

src/mathed/InsetMathGrid.cpp

@@ -998,6 +998,27 @@ void InsetMathGrid::mathmlize(MathStream & os) const
 }
 
 
+void InsetMathGrid::htmlize(HtmlStream & os) const
+{
+	bool const havetable = nrows() > 1 || ncols() > 1;
+	if (!havetable) {
+		os << cell(index(0, 0));
+		return;
+	}
+	os << MTag("table", "class='mathtable'");
+	for (row_type row = 0; row < nrows(); ++row) {
+		os << MTag("tr");;
+		for (col_type col = 0; col < ncols(); ++col) {
+			os << MTag("td");
+			os << cell(index(row, col));
+			os << ETag("td");
+		}
+		os << ETag("tr");;
+	}
+	os << ETag("table");
+}
+
+
 void InsetMathGrid::write(WriteStream & os) const
 {
 	write(os, 0, 0, nrows(), ncols());

src/mathed/InsetMathGrid.h

@@ -222,6 +222,8 @@ public:
 	//void maple(MapleStream &) const;
 	///
 	void mathmlize(MathStream &) const;
+	/// 
+	void htmlize(HtmlStream &) const;
 	///
 	//void octave(OctaveStream &) const;
 

src/mathed/InsetMathHull.cpp

@@ -1810,14 +1810,38 @@ int InsetMathHull::docbook(odocstream & os, OutputParams const & runparams) cons
 
 docstring InsetMathHull::xhtml(XHTMLStream & xs, OutputParams const &) const
 {
-	if (getType() == hullSimple)
-		xs << html::StartTag("math", "xmlns=\"http://www.w3.org/1998/Math/MathML\"", true);
-	else 
-		xs << html::StartTag("math", 
-		        "display=\"block\" xmlns=\"http://www.w3.org/1998/Math/MathML\"", true);
-	MathStream ms(xs.os());
-	InsetMathGrid::mathmlize(ms);
-	xs << html::EndTag("math");
+	BufferParams::MathOutput mathtype = buffer().params().html_math_output;
+	// FIXME Eventually we would like to do this inset by inset.
+	switch (mathtype) {
+	case BufferParams::MathML: {
+		if (getType() == hullSimple)
+			xs << html::StartTag("math", 
+			      "xmlns=\"http://www.w3.org/1998/Math/MathML\"", true);
+		else 
+			xs << html::StartTag("math", 
+			      "display=\"block\" xmlns=\"http://www.w3.org/1998/Math/MathML\"", true);
+		MathStream ms(xs.os());
+		InsetMathGrid::mathmlize(ms);
+		xs << html::EndTag("math");
+		break;
+	} 
+	case BufferParams::HTML: {
+		string tag = (getType() == hullSimple) ? "span" : "div";
+		xs << html::StartTag(tag, "class='formula'", true);
+		HtmlStream ms(xs.os());
+		InsetMathGrid::htmlize(ms);
+		xs << html::EndTag(tag);
+		break;
+	} 
+	case BufferParams::Images: {
+		LYXERR0("Image output for math presently unsupported.");
+		break;
+	} 
+	case BufferParams::LaTeX: {
+		// FIXME Obviously, the only real question is how to wrap this.
+		LYXERR0("LaTeX output for math presently unsupported.");
+	}
+	} // end switch
 	return docstring();
 }
 

src/mathed/MathExtern.cpp

@@ -54,6 +54,7 @@ namespace lyx {
 namespace {
 
 enum ExternalMath {
+	HTML,
 	MAPLE,
 	MAXIMA,
 	MATHEMATICA,
@@ -120,7 +121,7 @@ MathData::iterator extractArgument(MathData & ar,
 		// leave out delimiters if this is a function argument
 		// unless we are doing MathML, in which case we do want
 		// the delimiters
-		if (function && kind != MATHML) {
+		if (function && kind != MATHML && kind != HTML) {
 			MathData const & arg = (*pos)->asDelimInset()->cell(0);
 			MathData::const_iterator cur = arg.begin();
 			MathData::const_iterator end = arg.end();
@@ -948,16 +949,16 @@ void extractLims(MathData & ar)
 void extractStructure(MathData & ar, ExternalMath kind)
 {
 	//lyxerr << "\nStructure from: " << ar << endl;
-	if (kind != MATHML)
+	if (kind != MATHML && kind != HTML)
 		splitScripts(ar);
 	extractDelims(ar);
 	extractIntegrals(ar, kind);
-	if (kind != MATHML)
+	if (kind != MATHML && kind != HTML)
 		extractSums(ar);
 	extractNumbers(ar);
 	extractMatrices(ar);
 	extractFunctions(ar, kind);
-	if (kind != MATHML) {
+	if (kind != MATHML && kind != HTML) {
 		extractDets(ar);
 		extractDiff(ar);
 		extractExps(ar);
@@ -1434,6 +1435,21 @@ void mathmlize(MathData const & dat, MathStream & os)
 }
 
 
+void htmlize(MathData const & dat, HtmlStream & os)
+{
+	MathData ar = dat;
+	extractStructure(ar, HTML);
+	if (ar.size() == 0) 
+		return;
+	if (ar.size() == 1) {
+		os << ar.front();
+		return;
+	}
+	for (MathData::const_iterator it = ar.begin(); it != ar.end(); ++it)
+		(*it)->htmlize(os);
+}
+
+
 // convert this inset somehow to a number
 bool extractNumber(MathData const & ar, int & i)
 {

src/mathed/MathExtern.h

@@ -16,6 +16,7 @@
 
 namespace lyx {
 
+class HtmlStream;
 class NormalStream;
 class MapleStream;
 class MaximaStream;
@@ -26,6 +27,7 @@ class WriteStream;
 class MathData;
 
 void write(MathData const &, WriteStream &);
+void htmlize(MathData const &, HtmlStream &);
 void normalize(MathData const &, NormalStream &);
 void maple(MathData const &, MapleStream &);
 void maxima(MathData const &, MaximaStream &);

src/mathed/MathStream.cpp

@@ -346,6 +346,99 @@ MathStream & operator<<(MathStream & ms, docstring const & s)
 }
 
 
+//////////////////////////////////////////////////////////////////////
+
+
+HtmlStream::HtmlStream(odocstream & os)
+	: os_(os), tab_(0), line_(0), lastchar_(0), in_text_(false)
+{}
+
+
+void HtmlStream::defer(docstring const & s)
+{
+	deferred_ << s;
+}
+
+
+void HtmlStream::defer(string const & s)
+{
+	deferred_ << from_utf8(s);
+}
+
+
+docstring HtmlStream::deferred() const
+{ 
+	return deferred_.str();
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, MathAtom const & at)
+{
+	at->htmlize(ms);
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, MathData const & ar)
+{
+	htmlize(ar, ms);
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, char const * s)
+{
+	ms.os() << s;
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, char c)
+{
+	ms.os() << c;
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, char_type c)
+{
+	ms.os().put(c);
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, MTag const & t)
+{
+	++ms.tab();
+	ms.os() << "\n";
+	ms.os() << '<' << from_ascii(t.tag_);
+	if (!t.attr_.empty())
+		ms.os() << " " << from_ascii(t.attr_);
+	ms << '>';
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, ETag const & t)
+{
+	ms.os() << "\n";
+	if (ms.tab() > 0)
+		--ms.tab();
+	ms.os() << "</" << from_ascii(t.tag_) << '>';
+	return ms;
+}
+
+
+HtmlStream & operator<<(HtmlStream & ms, docstring const & s)
+{
+	ms.os() << s;
+	return ms;
+}
+
+
+//////////////////////////////////////////////////////////////////////
+
+
 SetMode::SetMode(MathStream & os, bool text)
 	: os_(os), opened_(false)
 {

src/mathed/MathStream.h

@@ -352,6 +352,67 @@ private:
 };
 
 
+class HtmlStream {
+public:
+	///
+	explicit HtmlStream(odocstream & os);
+	///
+	void cr();
+	///
+	odocstream & os() { return os_; }
+	///
+	int line() const { return line_; }
+	///
+	int & tab() { return tab_; }
+	///
+	friend HtmlStream & operator<<(HtmlStream &, char const *);
+	///
+	void defer(docstring const &);
+	///
+	void defer(std::string const &);
+	///
+	docstring deferred() const;
+	///
+	bool inText() const { return in_text_; }
+private:
+	///
+	void setTextMode() { in_text_ = true; }
+	///
+	void setMathMode() { in_text_ = false; }
+	///
+	odocstream & os_;
+	///
+	int tab_;
+	///
+	int line_;
+	///
+	char lastchar_;
+	///
+	bool in_text_;
+	///
+	odocstringstream deferred_;
+	///
+	friend class SetMode;
+};
+
+///
+HtmlStream & operator<<(HtmlStream &, MathAtom const &);
+///
+HtmlStream & operator<<(HtmlStream &, MathData const &);
+///
+HtmlStream & operator<<(HtmlStream &, docstring const &);
+///
+HtmlStream & operator<<(HtmlStream &, char const *);
+///
+HtmlStream & operator<<(HtmlStream &, char);
+///
+HtmlStream & operator<<(HtmlStream &, char_type);
+///
+HtmlStream & operator<<(HtmlStream &, MTag const &);
+///
+HtmlStream & operator<<(HtmlStream &, ETag const &);
+
+
 //
 // Debugging
 //