lily/paper-stream.cc

   1 /*
   2   paper-stream.cc -- implement Paper_stream
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <fstream.h>
  10
  11 #include "main.hh"
  12 #include "paper-stream.hh"
  13 #include "debug.hh"
  14
  15 const int MAXLINELEN = 200;
  16
  17 Paper_stream::Paper_stream (String filename)
  18 {
  19   if (filename.length_i () && (filename != "-"))
  20     os = new ofstream (filename.ch_C ());
  21   else
  22     //    os = new ostream (cout.ostreambuf ());
  23     os = new ostream (cout._strbuf);
  24   if (!*os)
  25     error (_f ("Can't open file: `%s'", filename));
  26   nest_level = 0;
  27   line_len_i_ = 0;
  28   outputting_comment_b_=false;
  29 }
  30
  31 Paper_stream::~Paper_stream ()
  32 {
  33   *os << flush;
  34   if (!*os)
  35     {
  36       warning (_ ("Error syncing file (disk full?)"));
  37       exit_status_i_ = 1;
  38     }
  39   delete os;
  40   assert (nest_level == 0);
  41 }
  42
  43 // print string. don't forget indent.
  44 Paper_stream&
  45 Paper_stream::operator << (String s)
  46 {
  47   for (char const *cp = s.ch_C (); *cp; cp++)
  48     {
  49       if (outputting_comment_b_)
  50         {
  51           *os << *cp;
  52           if (*cp == '\n')
  53             {
  54               outputting_comment_b_=false;
  55               line_len_i_ =0;
  56             }
  57           continue;
  58         }
  59       line_len_i_ ++;
  60       switch (*cp)
  61         {
  62         case '%':
  63           outputting_comment_b_ = true;
  64           *os << *cp;
  65           break;
  66         case '{':
  67           nest_level++;
  68           *os << *cp;
  69           break;
  70         case '}':
  71           nest_level--;
  72           *os << *cp;
  73
  74           if (nest_level < 0)
  75             {
  76               delete os;        // we want to see the remains.
  77               assert (nest_level>=0);
  78             }
  79
  80           /* don't break line if not nested; very ugly for ps */
  81           if (nest_level == 0)
  82             break;
  83
  84           *os << '%';
  85           break_line ();
  86           break;
  87         case '\n':
  88           break_line ();
  89           break;
  90         case ' ':
  91           *os <<  ' ';
  92           if (line_len_i_ > MAXLINELEN)
  93             break_line ();
  94
  95           break;
  96         default:
  97           *os << *cp;
  98           break;
  99         }
 100     }
 101   //urg, for debugging only!!
 102   *os << flush;
 103   return *this;
 104 }
 105
 106 void
 107 Paper_stream::break_line ()
 108 {
 109   *os << '\n';
 110   *os << to_str (' ', nest_level);
 111   outputting_comment_b_ = false;
 112   line_len_i_ = 0;
 113 }
 114