lily/includable-lexer.cc

   1 /*
   2   includable-lexer.cc -- implement Includable_lexer
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <strstream.h>
  10
  11 #include "includable-lexer.hh"
  12 #include "source-file.hh"
  13 #include "source.hh"
  14 #include "debug.hh"
  15
  16 #ifndef YY_BUF_SIZE
  17 #define YY_BUF_SIZE 16384
  18 #endif
  19
  20 #ifndef YY_START
  21 #define YY_START ((yy_start - 1) / 2)
  22 #define YYSTATE YY_START
  23 #endif
  24
  25 Includable_lexer::Includable_lexer ()
  26 {
  27   yy_current_buffer = 0;
  28   allow_includes_b_ = true;
  29 }
  30
  31 /** set the  new input to s, remember old file.
  32 */
  33 void
  34 Includable_lexer::new_input (String s, Sources  * global_sources)
  35 {
  36   if (!allow_includes_b_)
  37     {
  38       LexerError ("include files are disallowed.");
  39       return;
  40     }
  41
  42   Source_file * sl = global_sources->get_file_l (s);
  43   if (!sl)
  44     {
  45       String msg = _f ("can't find file: `%s\'", s);
  46       LexerError (msg.ch_C ());
  47       return;
  48     }
  49   filename_str_arr_.push (sl->name_str ());
  50
  51   char_count_stack_.push (0);
  52   if (yy_current_buffer)
  53     state_stack_.push (yy_current_buffer);
  54   *mlog << "[" << s<< flush;
  55   include_stack_.push (sl);
  56
  57   /*
  58     ugh. We'd want to create a buffer from the bytes directly.
  59
  60     Whoops. The size argument to yy_create_buffer is not the
  61     filelength but a BUFFERSIZE. Maybe this is why reading stdin fucks up.
  62
  63     */
  64   yy_switch_to_buffer (yy_create_buffer (sl->istream_l (), YY_BUF_SIZE));
  65
  66 }
  67 void
  68 Includable_lexer::new_input (String name, String data, Sources* sources)
  69 {
  70   Source_file* file = new Source_file (name, data);
  71   sources->add (file);
  72   filename_str_arr_.push (name);
  73
  74   char_count_stack_.push (0);
  75   if (yy_current_buffer)
  76     state_stack_.push (yy_current_buffer);
  77   *mlog << "[" << name << flush;
  78   include_stack_.push (file);
  79
  80   yy_switch_to_buffer (yy_create_buffer (file->istream_l (), YY_BUF_SIZE));
  81 }
  82
  83 /** pop the inputstack.  conceptually this is a destructor, but it
  84   does not destruct the Source_file that Includable_lexer::new_input creates.  */
  85 bool
  86 Includable_lexer::close_input ()
  87 {
  88   include_stack_.pop ();
  89   char_count_stack_.pop ();
  90   *mlog << "]"<<flush;
  91   yy_delete_buffer (yy_current_buffer);
  92   yy_current_buffer = 0;
  93   if (state_stack_.empty ())
  94     {
  95       yy_current_buffer = 0;
  96       return false;
  97     }
  98   else
  99       {
 100         yy_switch_to_buffer (state_stack_.pop ());
 101         return true;
 102       }
 103 }
 104
 105 char const*
 106 Includable_lexer::here_ch_C ()
 107 {
 108   if (include_stack_.empty ())
 109     return 0;
 110   return include_stack_.top ()->ch_C () + char_count_stack_.top ();
 111 }
 112
 113 Includable_lexer::~Includable_lexer ()
 114 {
 115   while (!include_stack_.empty ())
 116     {
 117       close_input ();
 118     }
 119 }
 120 /**
 121   Since we don't create the buffer state from the bytes directly, we
 122   don't know about the location of the lexer. Add this as a
 123   YY_USER_ACTION */
 124 void
 125 Includable_lexer::add_lexed_char (int count)
 126 {
 127   char_count_stack_.top () += count;
 128 }
 129
 130 Source_file*
 131 Includable_lexer::source_file_l () const
 132 {
 133   if (include_stack_.empty ())
 134     return 0;
 135   else
 136     return include_stack_.top ();
 137 }