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--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "includable-lexer.hh"
  10
  11 #include <sstream>
  12 using namespace std;
  13
  14 #include "config.hh"
  15
  16 #include "file-name.hh"
  17 #include "file-path.hh"
  18 #include "international.hh"
  19 #include "main.hh"
  20 #include "source-file.hh"
  21 #include "sources.hh"
  22 #include "warn.hh"
  23
  24 #ifndef YY_BUF_SIZE
  25 #define YY_BUF_SIZE 16384
  26 #endif
  27
  28 #ifndef YY_START
  29 #define YY_START                                \
  30   ((yy_start - 1) / 2)
  31 #define YYSTATE YY_START
  32 #endif
  33
  34 /* Flex >= 2.5.29 has include stack; but we don't use that yet.  */
  35 #if !HAVE_FLEXLEXER_YY_CURRENT_BUFFER
  36 #define yy_current_buffer                                               \
  37   (yy_buffer_stack != 0 ? yy_buffer_stack[yy_buffer_stack_top] : 0)
  38 #endif
  39
  40 extern bool relative_includes;
  41
  42 Includable_lexer::Includable_lexer ()
  43 {
  44 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
  45   yy_current_buffer = 0;
  46 #endif
  47 }
  48
  49 /** Set the new input file to NAME, remember old file.  */
  50 void
  51 Includable_lexer::new_input (string name, Sources *sources)
  52 {
  53   string current_dir = dir_name (main_input_name_);
  54   if (relative_includes)
  55     current_dir = include_stack_.size () ? dir_name (include_stack_.back ()->name_string ()) : "";
  56
  57   Source_file *file = sources->get_file (name, current_dir);
  58   if (!file)
  59     {
  60       string msg = _f ("cannot find file: `%s'", name);
  61       msg += "\n";
  62       msg += _f ("(search path: `%s')",
  63                  (current_dir.length () ? (current_dir + PATHSEP) : "") + sources->path_->to_string ().c_str ());
  64       LexerError (msg.c_str ());
  65       return;
  66     }
  67   file_name_strings_.push_back (file->name_string ());
  68
  69   char_count_stack_.push_back (0);
  70   if (yy_current_buffer)
  71     state_stack_.push_back (yy_current_buffer);
  72
  73   if (be_verbose_global)
  74     {
  75       string spaces = "";
  76       for (size_t i = 0; i < state_stack_.size (); i++)
  77         spaces += " ";
  78       progress_indication (string ("\n") + spaces + string ("[") + file->name_string ());
  79     }
  80
  81   include_stack_.push_back (file);
  82
  83   /* Ugh. We'd want to create a buffer from the bytes directly.
  84
  85   Whoops.  The size argument to yy_create_buffer is not the
  86   filelength but a BUFFERSIZE.  Maybe this is why reading stdin fucks up.  */
  87   yy_switch_to_buffer (yy_create_buffer (file->get_istream (), YY_BUF_SIZE));
  88 }
  89
  90 void
  91 Includable_lexer::new_input (string name, string data, Sources *sources)
  92 {
  93   Source_file *file = new Source_file (name, data);
  94   sources->add (file);
  95   file_name_strings_.push_back (name);
  96
  97   char_count_stack_.push_back (0);
  98   if (yy_current_buffer)
  99     state_stack_.push_back (yy_current_buffer);
 100
 101   if (be_verbose_global)
 102     {
 103       string spaces = "";
 104       for (size_t i = 0; i < state_stack_.size (); i++)
 105         spaces += " ";
 106       progress_indication (string ("\n") + spaces + string ("[") + name);
 107     }
 108   include_stack_.push_back (file);
 109
 110   yy_switch_to_buffer (yy_create_buffer (file->get_istream (), YY_BUF_SIZE));
 111 }
 112
 113 /** pop the inputstack.  conceptually this is a destructor, but it
 114     does not destruct the Source_file that Includable_lexer::new_input
 115     creates.  */
 116 bool
 117 Includable_lexer::close_input ()
 118 {
 119   include_stack_.pop_back ();
 120   char_count_stack_.pop_back ();
 121   if (be_verbose_global)
 122     progress_indication ("]");
 123   yy_delete_buffer (yy_current_buffer);
 124 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
 125   yy_current_buffer = 0;
 126 #endif
 127   if (state_stack_.empty ())
 128     {
 129 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
 130       yy_current_buffer = 0;
 131 #endif
 132       return false;
 133     }
 134   yy_switch_to_buffer (state_stack_.back ());
 135   state_stack_.pop_back ();
 136   return true;
 137 }
 138
 139 char const *
 140 Includable_lexer::here_str0 () const
 141 {
 142   if (include_stack_.empty ())
 143     return 0;
 144   return include_stack_.back ()->c_str () + char_count_stack_.back ();
 145 }
 146
 147 Includable_lexer::~Includable_lexer ()
 148 {
 149   while (!include_stack_.empty ())
 150     close_input ();
 151 }
 152
 153 Source_file *
 154 Includable_lexer::get_source_file () const
 155 {
 156   if (include_stack_.empty ())
 157     return 0;
 158   return include_stack_.back ();
 159 }