Lar's ParConstIterator

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@5602 a592a061-630c-0410-9148-cb99ea01b6c8

src/ChangeLog

@@ -1,3 +1,14 @@
+2002-11-08  John Levon  <levon@movementarian.org>
+
+	* iterators.h:
+	* iterators.C:
+	* buffer.h:
+	* buffer.C:
+	* paragraph.h:
+	* paragraph.C:
+	* toc.h:
+	* toc.C: ParConstIterator, and use it (from Lars)
+ 
 2002-11-07  Ben Stanley  <bds02@uow.edu.au>
 
 	* lyxtextclass.[Ch]: revise and add doxygen comments

src/buffer.C

@@ -3343,6 +3343,18 @@ ParIterator Buffer::par_iterator_end()
 	return ParIterator();
 }
 
+ParConstIterator Buffer::par_iterator_begin() const
+{
+	return ParConstIterator(&*(paragraphs.begin()));
+}
+
+
+ParConstIterator Buffer::par_iterator_end() const
+{
+	return ParConstIterator();
+}
+
+
 
 void Buffer::addUser(BufferView * u)
 {

src/buffer.h

@@ -35,6 +35,7 @@ class TeXErrors;
 class LaTeXFeatures;
 class Language;
 class ParIterator;
+class ParConstIterator;
 
 
 ///
@@ -402,7 +403,11 @@ public:
 	///
 	ParIterator par_iterator_begin();
 	///
+	ParConstIterator par_iterator_begin() const;
+	///
 	ParIterator par_iterator_end();
+	///
+	ParConstIterator par_iterator_end() const;
 
 	///
 	Inset * getInsetFromID(int id_arg) const;

src/iterators.C

@@ -42,3 +42,45 @@ ParIterator & ParIterator::operator++()
 	}
 	return *this;
 }
+
+
+ParConstIterator & ParConstIterator::operator++()
+{
+	while (!positions.empty()) {
+		ParPosition & p = positions.top();
+
+		// Does the current inset contain more "cells" ?
+		if (p.index >= 0) {
+			++p.index;
+			Paragraph * par = p.it.getInset()->getFirstParagraph(p.index);
+			if (par) {
+				positions.push(ParPosition(par));
+				return *this;
+			}
+			++p.it;
+		} else
+			// The following line is needed because the value of
+			// p.it may be invalid if inset was added/removed to
+			// the paragraph pointed by the iterator
+			p.it = p.par->insetlist.begin();
+
+		// Try to find the next inset that contains paragraphs
+		InsetList::iterator end = p.par->insetlist.end();
+		for (; p.it != end; ++p.it) {
+			Paragraph * par = p.it.getInset()->getFirstParagraph(0);
+			if (par) {
+				p.index = 0;
+				positions.push(ParPosition(par));
+				return *this;
+			}
+		}
+		// Try to go to the next paragarph
+		if (p.par->next()) {
+			p = ParPosition(p.par->next());
+			return *this;
+		}
+
+		positions.pop();
+	}
+	return *this;
+}

src/iterators.h

@@ -74,4 +74,46 @@ bool operator!=(ParIterator const & iter1, ParIterator const & iter2) {
 	return !(iter1 == iter2);
 }
 
+
+class ParConstIterator {
+public:
+	///
+	typedef std::stack<ParPosition> PosHolder;
+	///
+	ParConstIterator() {}
+	///
+	ParConstIterator(Paragraph * par) {
+		positions.push(ParPosition(par));
+	}
+	///
+	ParConstIterator & operator++();
+	///
+	Paragraph const * operator*() {
+		return positions.top().par;
+	}
+	///
+	PosHolder::size_type size() const
+		{ return positions.size(); }
+	///
+	friend
+	bool operator==(ParConstIterator const & iter1,
+			ParConstIterator const & iter2);
+private:
+	///
+	PosHolder positions;
+};
+
+
+///
+inline
+bool operator==(ParConstIterator const & iter1, ParConstIterator const & iter2) {
+	return iter1.positions == iter2.positions;
+}
+
+///
+inline
+bool operator!=(ParConstIterator const & iter1, ParConstIterator const & iter2) {
+	return !(iter1 == iter2);
+}
+
 #endif

src/paragraph.C

@@ -1727,7 +1727,7 @@ bool Paragraph::isMultiLingual(BufferParams const & bparams)
 
 // Convert the paragraph to a string.
 // Used for building the table of contents
-string const Paragraph::asString(Buffer const * buffer, bool label)
+string const Paragraph::asString(Buffer const * buffer, bool label) const
 {
 	BufferParams const & bparams = buffer->params;
 	string s;
@@ -1755,7 +1755,7 @@ string const Paragraph::asString(Buffer const * buffer, bool label)
 
 
 string const Paragraph::asString(Buffer const * buffer,
-				 pos_type beg, pos_type end, bool label)
+				 pos_type beg, pos_type end, bool label) const
 {
 	ostringstream ost;
 

src/paragraph.h

@@ -77,10 +77,10 @@ public:
 	bool isMultiLingual(BufferParams const &);
 
 	///
-	string const asString(Buffer const *, bool label);
+	string const asString(Buffer const *, bool label) const;
 	///
 	string const asString(Buffer const *, lyx::pos_type beg, lyx::pos_type end,
-			      bool label);
+			      bool label) const;
 
 	///
 	void write(Buffer const *, std::ostream &, BufferParams const &,

src/toc.C

@@ -76,10 +76,11 @@ TocList const getTocList(Buffer const * buf)
 
 	LyXTextClass const & textclass = buf->params.getLyXTextClass();
 
-	ParIterator pit = buf->par_iterator_begin();
-	ParIterator end = buf->par_iterator_end();
+	ParConstIterator pit = buf->par_iterator_begin();
+	ParConstIterator end = buf->par_iterator_end();
 	for (; pit != end; ++pit) {
-		Paragraph * par = *pit;
+ 
+		Paragraph const * par = *pit;
  
 #ifdef WITH_WARNINGS
 #warning bogus type (Lgb)

src/toc.h

@@ -39,7 +39,7 @@ namespace toc
 
 ///
 struct TocItem {
-	TocItem(Paragraph * p, int d, string const & s)
+	TocItem(Paragraph const * p, int d, string const & s)
 		: par(p), depth(d), str(s) {}
 	///
 	string const asString() const;
@@ -48,7 +48,7 @@ struct TocItem {
 	/// the action corresponding to the goTo above
 	int action() const;
 	///
-	Paragraph * par;
+	Paragraph const * par;
 	///
 	int depth;
 	///