Use custom encoding for floats in binary format

[libs/datafile.git] / source / textwriter.cpp

diff --git a/source/textwriter.cpp b/source/textwriter.cpp
index 08909a1c6ed952b190754063d628f4e0e3dbe3dc..65f4870ea6e466816ee25d9dd40dbc550d00faa8 100644 (file)
--- a/source/textwriter.cpp
+++ b/source/textwriter.cpp
@@ -1,10 +1,3 @@
-/* $Id$
-
-This file is part of libmspdatafile
-Copyright © 2007-2008, 2010  Mikko Rasa, Mikkosoft Productions
-Distributed under the LGPL
-*/
-
 #include <msp/io/print.h>
 #include <msp/strings/utils.h>
 #include "statement.h"
@@ -16,9 +9,15 @@ namespace Msp {
 namespace DataFile {
 
 TextWriter::TextWriter(IO::Base &o):
-       WriterMode(o)
+       WriterMode(o),
+       float_format("%#.7g")
 { }
 
+void TextWriter::set_float_precision(unsigned fp)
+{
+       float_format = format("%%#.%dg", fp/4-1);
+}
+
 void TextWriter::write(const Statement &st)
 {
        write_(st, 0);
@@ -39,9 +38,15 @@ void TextWriter::write_(const Statement &st, unsigned level)
                else if(i->get_signature()==IntType::signature)
                        out.write(lexical_cast(i->get<IntType::Store>()));
                else if(i->get_signature()==FloatType::signature)
-                       out.write(format("%15g", (i->get<FloatType::Store>())));
+                       out.write(format(float_format, i->get<FloatType::Store>()));
                else if(i->get_signature()==SymbolType::signature)
-                       out.write(i->get<SymbolType::Store>().name);
+               {
+                       string name = i->get<SymbolType::Store>().name;
+                       if(isdigit(name[0]))
+                               out.write("\\"+name);
+                       else
+                               out.write(name);
+               }
        }
        if(!st.sub.empty())
        {