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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <strstream.h>
  10
  11
  12 #include "file-path.hh"
  13 #include "includable-lexer.hh"
  14 #include "source-file.hh"
  15 #include "source.hh"
  16 #include "debug.hh"
  17 #include "main.hh"
  18
  19 #ifndef YY_BUF_SIZE
  20 #define YY_BUF_SIZE 16384
  21 #endif
  22
  23 #ifndef YY_START
  24 #define YY_START ((yy_start - 1) / 2)
  25 #define YYSTATE YY_START
  26 #endif
  27
  28 Includable_lexer::Includable_lexer ()
  29 {
  30   yy_current_buffer = 0;
  31   allow_includes_b_ = true;
  32 }
  33
  34 /** set the  new input to s, remember old file.
  35 */
  36 void
  37 Includable_lexer::new_input (String s, Sources  * global_sources)
  38 {
  39   if (!allow_includes_b_)
  40     {
  41       LexerError ("include files are disallowed.");
  42       return;
  43     }
  44
  45   Source_file * sl = global_sources->get_file_l (s);
  46   if (!sl)
  47     {
  48       String msg = _f ("can't find file: `%s'", s);
  49       msg += "\n";
  50       msg += _f ("(search path: `%s')", global_sources->path_C_->str ().ch_C());
  51       msg += "\n";
  52       LexerError (msg.ch_C ());
  53
  54       return;
  55     }
  56   filename_str_arr_.push (sl->name_str ());
  57
  58   char_count_stack_.push (0);
  59   if (yy_current_buffer)
  60     state_stack_.push (yy_current_buffer);
  61
  62   if (verbose_global_b)
  63     progress_indication (String ("[") + s);
  64
  65   include_stack_.push (sl);
  66
  67   /*
  68     ugh. We'd want to create a buffer from the bytes directly.
  69
  70     Whoops. The size argument to yy_create_buffer is not the
  71     filelength but a BUFFERSIZE. Maybe this is why reading stdin fucks up.
  72
  73   */
  74   yy_switch_to_buffer (yy_create_buffer (sl->istream_l (), YY_BUF_SIZE));
  75
  76 }
  77 void
  78 Includable_lexer::new_input (String name, String data, Sources* sources)
  79 {
  80   Source_file* file = new Source_file (name, data);
  81   sources->add (file);
  82   filename_str_arr_.push (name);
  83
  84   char_count_stack_.push (0);
  85   if (yy_current_buffer)
  86     state_stack_.push (yy_current_buffer);
  87
  88   if (verbose_global_b)
  89     progress_indication (String ("[") + name);
  90   include_stack_.push (file);
  91
  92   yy_switch_to_buffer (yy_create_buffer (file->istream_l (), YY_BUF_SIZE));
  93 }
  94
  95 /** pop the inputstack.  conceptually this is a destructor, but it
  96   does not destruct the Source_file that Includable_lexer::new_input creates.  */
  97 bool
  98 Includable_lexer::close_input ()
  99 {
 100   include_stack_.pop ();
 101   char_count_stack_.pop ();
 102   if (verbose_global_b)
 103     progress_indication ("]");
 104   yy_delete_buffer (yy_current_buffer);
 105   yy_current_buffer = 0;
 106   if (state_stack_.empty ())
 107     {
 108       yy_current_buffer = 0;
 109       return false;
 110     }
 111   else
 112     {
 113       yy_switch_to_buffer (state_stack_.pop ());
 114       return true;
 115     }
 116 }
 117
 118 char const*
 119 Includable_lexer::here_ch_C () const
 120 {
 121   if (include_stack_.empty ())
 122     return 0;
 123   return include_stack_.top ()->ch_C () + char_count_stack_.top ();
 124 }
 125
 126 Includable_lexer::~Includable_lexer ()
 127 {
 128   while (!include_stack_.empty ())
 129     {
 130       close_input ();
 131     }
 132 }
 133 /**
 134   Since we don't create the buffer state from the bytes directly, we
 135   don't know about the location of the lexer. Add this as a
 136   YY_USER_ACTION */
 137 void
 138 Includable_lexer::add_lexed_char (int count)
 139 {
 140   char_count_stack_.top () += count;
 141 }
 142
 143 Source_file*
 144 Includable_lexer::source_file_l () const
 145 {
 146   if (include_stack_.empty ())
 147     return 0;
 148   else
 149     return include_stack_.top ();
 150 }