lily/includable-lexer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includable-lexer.hh"
  21
  22 #include <sstream>
  23 using namespace std;
  24
  25 #include "config.hh"
  26
  27 #include "file-name.hh"
  28 #include "file-path.hh"
  29 #include "international.hh"
  30 #include "main.hh"
  31 #include "source-file.hh"
  32 #include "sources.hh"
  33 #include "warn.hh"
  34
  35 #ifndef YY_BUF_SIZE
  36 #define YY_BUF_SIZE 16384
  37 #endif
  38
  39 #ifndef YY_START
  40 #define YY_START                                \
  41   ((yy_start - 1) / 2)
  42 #define YYSTATE YY_START
  43 #endif
  44
  45 /* Flex >= 2.5.29 has include stack; but we don't use that yet.  */
  46 #if !HAVE_FLEXLEXER_YY_CURRENT_BUFFER
  47 #define yy_current_buffer                                               \
  48   (yy_buffer_stack != 0 ? yy_buffer_stack[yy_buffer_stack_top] : 0)
  49 #endif
  50
  51 extern bool relative_includes;
  52
  53 Includable_lexer::Includable_lexer ()
  54 {
  55 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
  56   yy_current_buffer = 0;
  57 #endif
  58 }
  59
  60 /** Set the new input file to NAME, remember old file.  */
  61 void
  62 Includable_lexer::new_input (string name, Sources *sources)
  63 {
  64   string current_dir = dir_name (main_input_name_);
  65   if (relative_includes)
  66     current_dir = include_stack_.size () ? dir_name (include_stack_.back ()->name_string ()) : "";
  67
  68   Source_file *file = sources->get_file (name, current_dir);
  69   if (!file)
  70     {
  71       string msg = _f ("cannot find file: `%s'", name);
  72       msg += "\n";
  73       msg += _f ("(search path: `%s')",
  74                  (current_dir.length () ? (current_dir + PATHSEP) : "") + sources->path_->to_string ().c_str ());
  75       LexerError (msg.c_str ());
  76       return;
  77     }
  78   file_name_strings_.push_back (file->name_string ());
  79
  80   char_count_stack_.push_back (0);
  81   if (yy_current_buffer)
  82     state_stack_.push_back (yy_current_buffer);
  83
  84   if (be_verbose_global)
  85     {
  86       string spaces = "";
  87       for (size_t i = 0; i < state_stack_.size (); i++)
  88         spaces += " ";
  89       progress_indication (string ("\n") + spaces + string ("[") + file->name_string ());
  90     }
  91
  92   include_stack_.push_back (file);
  93
  94   /* Ugh. We'd want to create a buffer from the bytes directly.
  95
  96   Whoops.  The size argument to yy_create_buffer is not the
  97   filelength but a BUFFERSIZE.  Maybe this is why reading stdin fucks up.  */
  98   yy_switch_to_buffer (yy_create_buffer (file->get_istream (), YY_BUF_SIZE));
  99 }
 100
 101 void
 102 Includable_lexer::new_input (string name, string data, Sources *sources)
 103 {
 104   Source_file *file = new Source_file (name, data);
 105   sources->add (file);
 106   file_name_strings_.push_back (name);
 107
 108   char_count_stack_.push_back (0);
 109   if (yy_current_buffer)
 110     state_stack_.push_back (yy_current_buffer);
 111
 112   if (be_verbose_global)
 113     {
 114       string spaces = "";
 115       for (size_t i = 0; i < state_stack_.size (); i++)
 116         spaces += " ";
 117       progress_indication (string ("\n") + spaces + string ("[") + name);
 118     }
 119   include_stack_.push_back (file);
 120
 121   yy_switch_to_buffer (yy_create_buffer (file->get_istream (), YY_BUF_SIZE));
 122 }
 123
 124 /** pop the inputstack.  conceptually this is a destructor, but it
 125     does not destruct the Source_file that Includable_lexer::new_input
 126     creates.  */
 127 bool
 128 Includable_lexer::close_input ()
 129 {
 130   include_stack_.pop_back ();
 131   char_count_stack_.pop_back ();
 132   if (be_verbose_global)
 133     progress_indication ("]");
 134   yy_delete_buffer (yy_current_buffer);
 135 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
 136   yy_current_buffer = 0;
 137 #endif
 138   if (state_stack_.empty ())
 139     {
 140 #if HAVE_FLEXLEXER_YY_CURRENT_BUFFER
 141       yy_current_buffer = 0;
 142 #endif
 143       return false;
 144     }
 145   yy_switch_to_buffer (state_stack_.back ());
 146   state_stack_.pop_back ();
 147   return true;
 148 }
 149
 150 char const *
 151 Includable_lexer::here_str0 () const
 152 {
 153   if (include_stack_.empty ())
 154     return 0;
 155   return include_stack_.back ()->c_str () + char_count_stack_.back ();
 156 }
 157
 158 Includable_lexer::~Includable_lexer ()
 159 {
 160   while (!include_stack_.empty ())
 161     close_input ();
 162 }
 163
 164 Source_file *
 165 Includable_lexer::get_source_file () const
 166 {
 167   if (include_stack_.empty ())
 168     return 0;
 169   return include_stack_.back ();
 170 }