ltlcross: follow RFC 4180 for CSV output.

* src/misc/escape.cc, src/misc/escape.hh (escape_rfc4180): New
function.
* src/bin/ltlcross.cc: Do not output space after ',', use
"\r\n" for end of line, and use escape_rfc4180().
* NEWS: Mention it.

NEWS

@@ -1,6 +1,7 @@
 New in spot 1.2a (not released)
 
-  Nothing yet.
+  * Bug fixes:
+    - ltlcross' CSV output now stricly follows RFC 4180.
 
 New in spot 1.2 (2013-10-01)
 

src/bin/ltlcross.cc

@@ -298,23 +298,23 @@ struct statistics
   void
   to_csv(std::ostream& os)
   {
-    os << states << ", "
+    os << states << ','
-       << edges << ", "
+       << edges << ','
-       << transitions << ", "
+       << transitions << ','
-       << acc << ", "
+       << acc << ','
-       << scc << ", "
+       << scc << ','
-       << nonacc_scc << ", "
+       << nonacc_scc << ','
-       << terminal_scc << ", "
+       << terminal_scc << ','
-       << weak_scc << ", "
+       << weak_scc << ','
-       << strong_scc << ", "
+       << strong_scc << ','
-       << nondetstates << ", "
+       << nondetstates << ','
-       << nondeterministic << ", "
+       << nondeterministic << ','
-       << terminal_aut << ", "
+       << terminal_aut << ','
-       << weak_aut << ", "
+       << weak_aut << ','
-       << strong_aut << ", "
+       << strong_aut << ','
-       << time << ", "
+       << time << ','
-       << product_states << ", "
+       << product_states << ','
-       << product_transitions << ", "
+       << product_transitions << ','
        << product_scc;
   }
 };
@@ -935,7 +935,7 @@ namespace
 	      if (first)
 		first = false;
 	      else
-		err << ",";
+		err << ',';
 	      err << l << i;
 	    }
 	err << "} disagree with {";
@@ -946,7 +946,7 @@ namespace
 	      if (first)
 		first = false;
 	      else
-		err << ",";
+		err << ',';
 	      err << l << i;
 	    }
 	err << "} when evaluating ";
@@ -1322,6 +1322,7 @@ namespace
   };
 }
 
+// Output an RFC4180-compatible CSV file.
 static void
 print_stats_csv(const char* filename)
 {
@@ -1344,18 +1345,18 @@ print_stats_csv(const char* filename)
 
   *out << "\"formula\",\"tool\",";
   statistics::fields(*out);
-  *out << "\n";
+  *out << "\r\n";
   for (unsigned r = 0; r < rounds; ++r)
     for (unsigned t = 0; t < ntrans; ++t)
       if (vstats[r][t].ok)
 	{
 	  *out << "\"";
-	  spot::escape_str(*out, formulas[r]);
+	  spot::escape_rfc4180(*out, formulas[r]);
 	  *out << "\",\"";
-	  spot::escape_str(*out, translators[t]);
+	  spot::escape_rfc4180(*out, translators[t]);
 	  *out << "\",";
 	  vstats[r][t].to_csv(*out);
-	  *out << "\n";
+	  *out << "\r\n";
 	}
   delete outfile;
 }
@@ -1404,9 +1405,9 @@ print_stats_json(const char* filename)
       if (vstats[r][t].ok)
 	{
 	  if (notfirst)
-	    *out << ",";
+	    *out << ',';
 	  notfirst = true;
-	  *out << "\n    [ " << r << ", " << t << ", ";
+	  *out << "\n    [ " << r << ',' << t << ',';
 	  vstats[r][t].to_csv(*out);
 	  *out << " ]";
 	}

src/misc/escape.cc

@@ -31,6 +31,22 @@
 
 namespace spot
 {
+  std::ostream&
+  escape_rfc4180(std::ostream& os, const std::string& str)
+  {
+    for (std::string::const_iterator i = str.begin(); i != str.end(); ++i)
+      switch (*i)
+	{
+	case '"':
+	  os << "\"\"";
+	  break;
+	default:
+	  os << *i;
+	  break;
+	}
+    return os;
+  }
+
   std::ostream&
   escape_str(std::ostream& os, const std::string& str)
   {

src/misc/escape.hh

@@ -32,16 +32,26 @@ namespace spot
   /// \addtogroup misc_tools
   /// @{
 
-  /// \brief Escape characters <code>"</code>, <code>\\</code>, and
+  /// \brief Double characters <code>"</code> in strings.
-  /// <code>\\n</code> in \a str.
+  ///
-  SPOT_API std::ostream& escape_str(std::ostream& os, const std::string& str);
+  /// In CSV files, as defined by RFC4180, double-quoted string that
+  /// contain double-quotes should simply duplicate those quotes.
+  SPOT_API std::ostream&
+  escape_rfc4180(std::ostream& os, const std::string& str);
 
   /// \brief Escape characters <code>"</code>, <code>\\</code>, and
   /// <code>\\n</code> in \a str.
-  SPOT_API std::string escape_str(const std::string& str);
+  SPOT_API std::ostream&
+  escape_str(std::ostream& os, const std::string& str);
+
+  /// \brief Escape characters <code>"</code>, <code>\\</code>, and
+  /// <code>\\n</code> in \a str.
+  SPOT_API std::string
+  escape_str(const std::string& str);
 
   /// \brief Remove spaces at the front and back of \a str.
-  SPOT_API void trim(std::string& str);
+  SPOT_API void
+  trim(std::string& str);
   /// @}
 }