math-extern: enable handling of simple sums

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3009 a592a061-630c-0410-9148-cb99ea01b6c8

src/mathed/math_exintinset.C

@@ -5,8 +5,8 @@
 #include "math_symbolinset.h"
 
 
-MathExIntInset::MathExIntInset()
-	: int_(new MathSymbolInset("int"))
+MathExIntInset::MathExIntInset(string const & name)
+	: symbol_(name)
 {}
 
 
@@ -16,9 +16,9 @@ MathInset * MathExIntInset::clone() const
 }
 
 
-void MathExIntInset::differential(MathArray const & ar)
+void MathExIntInset::index(MathArray const & ar)
 {
-	diff_ = ar;
+	index_ = ar;
 }
 
 
@@ -34,9 +34,15 @@ void MathExIntInset::scripts(MathAtom const & at)
 }
 
 
-void MathExIntInset::symbol(MathAtom const & at)
+MathAtom & MathExIntInset::scripts()
 {
-	int_ = at;
+	return scripts_;
+}
+
+
+void MathExIntInset::symbol(string const & symbol)
+{
+	symbol_ = symbol;
 }
 
 
@@ -49,12 +55,12 @@ bool MathExIntInset::hasScripts() const
 
 void MathExIntInset::normalize(NormalStream & os) const
 {
-	os << "[int ";
+	os << '[' << symbol_.c_str() << ' ';
 	if (hasScripts())
 		os << scripts_.nucleus();
 	else 
 		os << "{}";
-	os << ' ' << core_ << ' ' << diff_ << ']';
+	os << ' ' << core_ << ' ' << index_ << ']';
 }
 
 
@@ -72,12 +78,12 @@ void MathExIntInset::draw(Painter &, int, int) const
 
 void MathExIntInset::maplize(MapleStream & os) const
 {
-	os << int_.nucleus() << '(';
+	os << symbol_.c_str() << '(';
 	if (core_.size())
 		os << core_;
 	else 
 		os << '1';
-	os << ',' << diff_;
+	os << ',' << index_;
 	if (hasScripts()) {
 		MathScriptInset * p = scripts_->asScriptInset();
 		os << '=' << p->down().data_ << ".." << p->up().data_;
@@ -88,20 +94,20 @@ void MathExIntInset::maplize(MapleStream & os) const
 
 void MathExIntInset::mathmlize(MathMLStream & os) const
 {
+	MathSymbolInset * sym = new MathSymbolInset(symbol_.c_str());
 	if (hasScripts())
-		scripts_->asScriptInset()->mathmlize(int_.nucleus(), os);
+		scripts_->asScriptInset()->mathmlize(sym, os);
 	else 
-		int_->mathmlize(os);
+		sym->mathmlize(os);
+	delete sym;
 	os << core_ << "<mo> &InvisibleTimes; </mo>"
 	   << MTag("mrow") << "<mo> &DifferentialD; </mo>"
-	   << diff_ << ETag("mrow");
+	   << index_ << ETag("mrow");
 }
 
 
-void MathExIntInset::write(WriteStream & os) const
+void MathExIntInset::write(WriteStream &) const
 {
-	if (hasScripts())
-		os << scripts_.nucleus();
-	os << core_ << "d" << diff_;
+	lyxerr << "should not happen\n";
 }
 

src/mathed/math_exintinset.h

@@ -10,19 +10,19 @@
 class MathExIntInset : public MathInset {
 public:
 	///
-	MathExIntInset();
+	explicit MathExIntInset(string const & name_);
 	///
 	MathInset * clone() const;
 	///
-	void differential(MathArray const &);
+	void index(MathArray const &);
 	///
 	void core(MathArray const &);
 	///
 	void scripts(MathAtom const &);
 	///
-	void symbol(MathAtom const &);
+	MathAtom & scripts();
 	///
-	bool hasScripts() const;
+	void symbol(string const &);
 	///
 	void metrics(MathMetricsInfo const & st) const;
 	///
@@ -38,12 +38,16 @@ public:
 	void write(WriteStream & os) const;
 private:
 	///
-	MathAtom int_;
+	bool hasScripts() const;
+
+	///
+	string symbol_;
 	///
 	MathAtom scripts_;
 	///
 	MathArray core_;
 	///
-	MathArray diff_;
+	MathArray index_;
 };
+
 #endif

src/mathed/math_extern.C

@@ -3,6 +3,7 @@
 // information" from the unstructered layout-oriented stuff in an
 // MathArray.
 
+#include <algorithm>
 
 #include "math_charinset.h"
 #include "math_deliminset.h"
@@ -111,9 +112,10 @@ string extractString(MathInset * p)
 // define a function for tests
 typedef bool TestItemFunc(MathInset *);
 
-// define a function for replacing pa
+// define a function for replacing subexpressions
 typedef MathInset * ReplaceArgumentFunc(const MathArray & ar);
 
+
 // search end of nested sequence
 MathArray::iterator endNestSearch(
 	MathArray::iterator it,
@@ -293,7 +295,7 @@ void extractIntegrals(MathArray & ar)
 			continue;
 
 		// create a proper inset as replacement
-		MathExIntInset * p = new MathExIntInset;
+		MathExIntInset * p = new MathExIntInset("int");
 
 		// collect scripts
 		MathArray::iterator st = it + 1;
@@ -305,26 +307,109 @@ void extractIntegrals(MathArray & ar)
 		}
 
 		// use the atom behind the 'd' as differential
-		MathArray diff;
+		MathArray ind;
 		if (jt + 1 != ar.end()) {
-			diff.push_back(*(jt + 1));
-			ar.erase(it + 1, jt + 2);
-		} else {
-			ar.erase(it + 1, jt + 1);
+			ind.push_back(*(jt + 1));
+			++jt;
 		}
-		p->differential(diff);
+		ar.erase(it + 1, jt + 1);
+
+		p->index(ind);
 		(*it).reset(p);
 	}
 	lyxerr << "\nIntegrals to: " << ar << "\n";
 }
 
 
+//
+// search sums
+//
+
+bool sumSymbolTest(MathInset * p)
+{
+	return p->asSymbolInset() && p->asSymbolInset()->name() == "sum";
+}
+
+
+bool equalSign(MathInset * p)
+{
+	return extractString(p) == "=";
+}
+
+
+bool equalSign1(MathAtom const & at)
+{
+	return equalSign(at.nucleus());
+}
+
+
+
+// replace '\sum' ['_^'] f(x) sequences by a real MathExIntInset
+// assume 'extractDelims' ran before
+void extractSums(MathArray & ar)
+{
+	// we need at least two items...
+	if (ar.size() <= 1)
+		return;
+
+	lyxerr << "\nSums from: " << ar << "\n";
+	for (MathArray::size_type i = 0; i < ar.size() - 1; ++i) {
+		MathArray::iterator it = ar.begin() + i;
+
+		// is this a sum name?
+		if (!sumSymbolTest(it->nucleus()))
+			continue;
+
+		// create a proper inset as replacement
+		MathExIntInset * p = new MathExIntInset("sum");
+
+		// collect scripts
+		MathArray::iterator st = it + 1;
+		if (st != ar.end() && (*st)->asScriptInset()) {
+			p->scripts(*st);
+			++st;
+
+			// try to figure out the summation index from the subscript
+			MathScriptInset * script = p->scripts()->asScriptInset();
+			if (script->hasDown()) {
+				MathArray & ar = script->down().data_;
+				MathArray::iterator it =
+					std::find_if(ar.begin(), ar.end(), &equalSign1);
+				if (it != ar.end()) {
+					// we found a '=', use everything in front of that as index,
+					// and everything behind as start value
+					p->index(MathArray(ar.begin(), it));
+					ar.erase(ar.begin(), it + 1);
+				} else {
+					// use everything as summation index
+					p->index(ar);
+					p->scripts().reset(0);
+				}
+			}
+		}
+
+		// use the atom behind the script as core
+		MathArray ind;
+		if (st != ar.end()) {
+			MathArray core;
+			core.push_back(*st);
+			p->core(core);
+			++st;
+		}
+		ar.erase(it + 1, st);
+		(*it).reset(p);
+	}
+	lyxerr << "\nSums to: " << ar << "\n";
+}
+
+
 void extractStructure(MathArray & ar)
 {
 	extractMatrices(ar);
 	extractDelims(ar);
 	extractFunctions(ar);
 	extractIntegrals(ar);
+	extractSums(ar);
 	extractStrings(ar);
 }