[LyX/master] Extend the otexstream class to also report about paragraph breaks.

[Enrico Forestieri]

commit ee9ff6cb0cd7d8b0ef3c18e5bd166e12580a3bf4
Author: Enrico Forestieri <for...@lyx.org>
Date:   Sun May 18 22:46:33 2014 +0200

    Extend the otexstream class to also report about paragraph breaks.
    
    The new method afterParbreak() returns true if a blank line was just
    output and we are at the beginning of the next line, false otherwise.

diff --git a/src/support/docstream.cpp b/src/support/docstream.cpp
index e8839e0..38cabc4 100644
--- a/src/support/docstream.cpp
+++ b/src/support/docstream.cpp
@@ -414,12 +414,9 @@ void otexstream::put(char_type const & c)
                protectspace_ = false;
        }
        os_.put(c);
-       lastchar_ = c;
-       if (c == '\n') {
+       lastChar(c);
+       if (c == '\n')
                texrow_.newline();
-               canbreakline_ = false;
-       } else
-               canbreakline_ = true;
 }
 
 
@@ -432,7 +429,6 @@ otexstream & operator<<(otexstream & ots, BreakLine)
        if (ots.canBreakLine()) {
                ots.os().put('\n');
                ots.lastChar('\n');
-               ots.canBreakLine(false);
                ots.texrow().newline();
        }
        ots.protectSpace(false);
@@ -445,7 +441,6 @@ otexstream & operator<<(otexstream & ots, SafeBreakLine)
        if (ots.canBreakLine()) {
                ots.os() << "%\n";
                ots.lastChar('\n');
-               ots.canBreakLine(false);
                ots.texrow().newline();
        }
        ots.protectSpace(false);
@@ -503,9 +498,10 @@ otexstream & operator<<(otexstream & ots, docstring const 
& s)
        } else
                ots.os() << s;
 
+       if (len > 1)
+               ots.canBreakLine(s[len - 2] != '\n');
        ots.lastChar(s[len - 1]);
        ots.texrow().newlines(count(s.begin(), s.end(), '\n'));
-       ots.canBreakLine(s[len - 1] != '\n');
        return ots;
 }
 
@@ -535,7 +531,6 @@ otexstream & operator<<(otexstream & ots, char c)
        ots.lastChar(c);
        if (c == '\n')
                ots.texrow().newline();
-       ots.canBreakLine(c != '\n');
        return ots;
 }
 
@@ -545,7 +540,6 @@ otexstream & operator<<(otexstream & ots, Type value)
 {
        ots.os() << value;
        ots.lastChar(0);
-       ots.canBreakLine(true);
        ots.protectSpace(false);
        return ots;
 }
diff --git a/src/support/docstream.h b/src/support/docstream.h
index 6da05e3..e2f56f9 100644
--- a/src/support/docstream.h
+++ b/src/support/docstream.h
@@ -90,15 +90,16 @@ typedef odocstream & (*odocstream_manip)(odocstream &);
     they were iomanip's to ensure that the next output will start at the
     beginning of a line. Using "breakln", a '\n' char will be output if needed,
     while using "safebreakln", "%\n" will be output if needed.
-    The class also records the last output character.
+    The class also records the last output character and can tell whether
+    a paragraph break was just output.
   */
 
 class otexstream {
 public:
        ///
        otexstream(odocstream & os, TexRow & texrow)
-               : os_(os), texrow_(texrow),
-                 canbreakline_(false), protectspace_(false), lastchar_(0) {}
+               : os_(os), texrow_(texrow), canbreakline_(false),
+                 protectspace_(false), parbreak_(true), lastchar_(0) {}
        ///
        odocstream & os() { return os_; }
        ///
@@ -114,9 +115,16 @@ public:
        ///
        bool protectSpace() const { return protectspace_; }
        ///
-       void lastChar(char_type const & c) { lastchar_ = c; }
+       void lastChar(char_type const & c)
+       {
+               parbreak_ = (!canbreakline_ && c == '\n');
+               canbreakline_ = (c != '\n');
+               lastchar_ = c;
+       }
        ///
        char_type lastChar() const { return lastchar_; }
+       ///
+       bool afterParbreak() const { return parbreak_; }
 private:
        ///
        odocstream & os_;
@@ -127,6 +135,8 @@ private:
        ///
        bool protectspace_;
        ///
+       bool parbreak_;
+       ///
        char_type lastchar_;
 };