lily/tex-stream.cc

   1 /*
   2   tex-stream.cc -- implement Tex_stream
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7
   8   TODO
   9
  10   make an abstract interface to output, operations:
  11
  12   move (x,y), put (symbol).
  13 */
  14
  15 #include <fstream.h>
  16 #include <time.h>
  17
  18 #include "tex.hh"
  19 #include "main.hh"
  20 #include "tex-stream.hh"
  21 #include "debug.hh"
  22
  23 const int MAXLINELEN = 200;
  24
  25 Tex_stream::Tex_stream (String filename)
  26 {
  27   os = new ofstream (filename);
  28   if (!*os)
  29         error ("can't open `" + filename+"\'");
  30   nest_level = 0;
  31   line_len_i_ = 0;
  32   outputting_comment=false;
  33   header();
  34 }
  35 void
  36 Tex_stream::header()
  37 {
  38   *os << "% Creator: " << get_version_str() << "\n";
  39   *os << "% Automatically generated, at ";
  40   time_t t (time (0));
  41   *os << ctime (&t)<<"\n";
  42 }
  43 Tex_stream::~Tex_stream()
  44 {
  45   delete os;
  46   assert (nest_level == 0);
  47 }
  48
  49 // print string. don't forget indent.
  50 Tex_stream &
  51 Tex_stream::operator<<(String s)
  52 {
  53
  54   for (char const *cp = s; *cp; cp++)
  55     {
  56         if (outputting_comment)
  57           {
  58             *os << *cp;
  59             if (*cp == '\n')
  60               {
  61                 outputting_comment=false;
  62
  63               }
  64             continue;
  65           }
  66         line_len_i_ ++;
  67         switch (*cp)
  68             {
  69             case '%':
  70                 outputting_comment = true;
  71                 *os << *cp;
  72                 break;
  73             case '{':
  74                 nest_level++;
  75                 *os << *cp;
  76                 break;
  77             case '}':
  78                 nest_level--;
  79                 *os << *cp;
  80
  81                 if (nest_level < 0)
  82                   {
  83                     delete os;  // we want to see the remains.
  84                     assert (nest_level>=0);
  85                   }
  86                 /* FALLTHROUGH */
  87
  88             case '\n':
  89                 break_line();
  90                 break;
  91             case ' ':
  92                 *os <<  ' ';
  93                 if (line_len_i_ > MAXLINELEN)
  94                    break_line();
  95
  96                 break;
  97             default:
  98                 *os << *cp;
  99                 break;
 100               }
 101     }
 102   return *this;
 103 }
 104
 105 void
 106 Tex_stream::break_line()
 107 {
 108   *os << "%\n";
 109   *os << String (' ', nest_level);
 110   line_len_i_ = 0;
 111 }
 112
 113 /* *************************************************************** */