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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include <sstream>
  10
  11 #include "config.h"
  12
  13 #include "includable-lexer.hh"
  14 #include "file-path.hh"
  15 #include "source-file.hh"
  16 #include "source.hh"
  17 #include "warn.hh"
  18 #include "main.hh"
  19
  20 #ifndef YY_BUF_SIZE
  21 #define YY_BUF_SIZE 16384
  22 #endif
  23
  24 #ifndef YY_START
  25 #define YY_START\
  26  ((yy_start - 1) / 2)
  27 #define YYSTATE YY_START
  28 #endif
  29
  30 /* Flex >= 2.5.29 has include stack; but we don't use that yet.  */
  31 #if !HAVE_FLEXLEXER_YY_CURRENT_BUFFER
  32 #define yy_current_buffer \
  33   (yy_buffer_stack != 0 ? yy_buffer_stack[yy_buffer_stack_top] : 0)
  34 #endif
  35
  36 Includable_lexer::Includable_lexer ()
  37 {
  38 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
  39   yy_current_buffer = 0;
  40 #endif
  41   allow_includes_b_ = true;
  42 }
  43
  44 /** Set the new input file to NAME, remember old file.  */
  45 void
  46 Includable_lexer::new_input (String name, Sources *sources)
  47 {
  48   if (!allow_includes_b_)
  49     {
  50       LexerError (_ ("include files are not allowed").to_str0 ());
  51       return;
  52     }
  53
  54   Source_file *file = sources->get_file (name);
  55   if (!file)
  56     {
  57       String msg = _f ("can't find file: `%s'", name);
  58       msg += "\n";
  59       msg += _f ("(search path: `%s')",
  60                  sources->path_->to_string ().to_str0 ());
  61       msg += "\n";
  62       LexerError (msg.to_str0 ());
  63       return;
  64     }
  65   filename_strings_.push (file->name_string ());
  66
  67   char_count_stack_.push (0);
  68   if (yy_current_buffer)
  69     state_stack_.push (yy_current_buffer);
  70
  71   if (verbose_global_b)
  72     progress_indication (String ("[") + name);
  73
  74   include_stack_.push (file);
  75
  76   /* Ugh. We'd want to create a buffer from the bytes directly.
  77
  78     Whoops.  The size argument to yy_create_buffer is not the
  79     filelength but a BUFFERSIZE.  Maybe this is why reading stdin fucks up.  */
  80   yy_switch_to_buffer (yy_create_buffer (file->get_istream (), YY_BUF_SIZE));
  81 }
  82
  83 void
  84 Includable_lexer::new_input (String name, String data, Sources *sources)
  85 {
  86   Source_file *file = new Source_file (name, data);
  87   sources->add (file);
  88   filename_strings_.push (name);
  89
  90   char_count_stack_.push (0);
  91   if (yy_current_buffer)
  92     state_stack_.push (yy_current_buffer);
  93
  94   if (verbose_global_b)
  95     progress_indication (String ("[") + name);
  96   include_stack_.push (file);
  97
  98   yy_switch_to_buffer (yy_create_buffer (file->get_istream (), YY_BUF_SIZE));
  99 }
 100
 101 /** pop the inputstack.  conceptually this is a destructor, but it
 102   does not destruct the Source_file that Includable_lexer::new_input
 103   creates.  */
 104 bool
 105 Includable_lexer::close_input ()
 106 {
 107   include_stack_.pop ();
 108   char_count_stack_.pop ();
 109   if (verbose_global_b)
 110     progress_indication ("]");
 111   yy_delete_buffer (yy_current_buffer);
 112 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
 113   yy_current_buffer = 0;
 114 #endif
 115   if (state_stack_.is_empty ())
 116     {
 117 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
 118       yy_current_buffer = 0;
 119 #endif
 120       return false;
 121     }
 122   yy_switch_to_buffer (state_stack_.pop ());
 123   return true;
 124 }
 125
 126 char const*
 127 Includable_lexer::here_str0 () const
 128 {
 129   if (include_stack_.is_empty ())
 130     return 0;
 131   return include_stack_.top ()->to_str0 () + char_count_stack_.top ();
 132 }
 133
 134 Includable_lexer::~Includable_lexer ()
 135 {
 136   while (!include_stack_.is_empty ())
 137     {
 138       close_input ();
 139     }
 140 }
 141 /**
 142   Since we don't create the buffer state from the bytes directly, we
 143   don't know about the location of the lexer. Add this as a
 144   YY_USER_ACTION */
 145 void
 146 Includable_lexer::add_lexed_char (int count)
 147 {
 148   char_count_stack_.top () += count;
 149 }
 150
 151 Source_file*
 152 Includable_lexer::get_source_file () const
 153 {
 154   if (include_stack_.is_empty ())
 155     return 0;
 156   else
 157     return include_stack_.top ();
 158 }