lily/lily-parser.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   Jan Nieuwenhuizen <janneke@gnu.org>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "lily-parser.hh"
  22
  23 #include "book.hh"
  24 #include "file-name.hh"
  25 #include "file-path.hh"
  26 #include "international.hh"
  27 #include "lily-lexer.hh"
  28 #include "lily-version.hh"
  29 #include "ly-module.hh"
  30 #include "main.hh"
  31 #include "output-def.hh"
  32 #include "paper-book.hh"
  33 #include "parser.hh"
  34 #include "score.hh"
  35 #include "sources.hh"
  36 #include "warn.hh"
  37 #include "program-option.hh"
  38
  39 #include "ly-smobs.icc"
  40
  41 Lily_parser::Lily_parser (Sources *sources)
  42 {
  43   lexer_ = 0;
  44   sources_ = sources;
  45   default_duration_ = Duration (2, 0);
  46   error_level_ = 0;
  47
  48   smobify_self ();
  49
  50   lexer_ = new Lily_lexer (sources_, this);
  51   lexer_->unprotect ();
  52 }
  53
  54 Lily_parser::Lily_parser (Lily_parser const &src)
  55 {
  56   lexer_ = 0;
  57   sources_ = src.sources_;
  58   default_duration_ = src.default_duration_;
  59   error_level_ = src.error_level_;
  60   output_basename_ = src.output_basename_;
  61
  62   smobify_self ();
  63   if (src.lexer_)
  64     {
  65       lexer_ = new Lily_lexer (*src.lexer_, this);
  66     }
  67
  68   lexer_->unprotect ();
  69 }
  70
  71 Lily_parser::~Lily_parser ()
  72 {
  73 }
  74
  75
  76 SCM
  77 Lily_parser::mark_smob (SCM s)
  78 {
  79   Lily_parser *parser = (Lily_parser *) SCM_CELL_WORD_1 (s);
  80   return (parser->lexer_) ? parser->lexer_->self_scm () : SCM_EOL;
  81 }
  82
  83 int
  84 Lily_parser::print_smob (SCM s, SCM port, scm_print_state*)
  85 {
  86   scm_puts ("#<Lily_parser ", port);
  87   Lily_parser *parser = (Lily_parser *) SCM_CELL_WORD_1 (s);
  88   if (parser->lexer_)
  89     scm_display (parser->lexer_->self_scm (), port);
  90   else
  91     scm_puts ("(no lexer yet)", port);
  92   scm_puts (" >", port);
  93   return 1;
  94 }
  95
  96 /* Process one .ly file, or book.  */
  97 void
  98 Lily_parser::parse_file (string init, string name, string out_name)
  99 {
 100   // TODO: use $parser
 101   lexer_->set_identifier (ly_symbol2scm ("parser"), self_scm ());
 102   output_basename_ = out_name;
 103
 104   lexer_->main_input_name_ = name;
 105
 106   message (_ ("Parsing..."));
 107
 108   set_yydebug (0);
 109
 110   lexer_->new_input (init, sources_);
 111
 112   File_name f (name);
 113   string s = global_path.find (f.base_ + ".twy");
 114   s = gulp_file_to_string (s, false, -1);
 115   scm_eval_string (ly_string2scm (s));
 116
 117   /* Read .ly IN_FILE, lex, parse, write \score blocks from IN_FILE to
 118      OUT_FILE (unless IN_FILE redefines output file name).  */
 119
 120   SCM mod = lexer_->set_current_scope ();
 121   do_yyparse ();
 122
 123   /*
 124     Don't mix cyclic pointers with weak tables.
 125   */
 126   lexer_->set_identifier (ly_symbol2scm ("parser"),
 127                           SCM_EOL);
 128   ly_reexport_module (scm_current_module ());
 129
 130   scm_set_current_module (mod);
 131
 132   if (!define_spots_.empty ())
 133     {
 134       define_spots_.back ().warning (_ ("braces do not match"));
 135       error_level_ = 1;
 136     }
 137
 138   error_level_ = error_level_ | lexer_->error_level_;
 139   clear ();
 140 }
 141
 142 void
 143 Lily_parser::parse_string (string ly_code)
 144 {
 145   // TODO: use $parser
 146   lexer_->set_identifier (ly_symbol2scm ("parser"),
 147                           self_scm ());
 148
 149   lexer_->main_input_name_ = "<string>";
 150   lexer_->is_main_input_ = true;
 151   lexer_->new_input (lexer_->main_input_name_, ly_code, sources_);
 152
 153   SCM mod = lexer_->set_current_scope ();
 154   do_yyparse ();
 155   scm_set_current_module (mod);
 156
 157   if (!define_spots_.empty ())
 158     {
 159       if (define_spots_.empty ()
 160           && !error_level_)
 161         programming_error ("define_spots_ don't match, but error_level_ not set.");
 162     }
 163
 164   error_level_ = error_level_ | lexer_->error_level_;
 165 }
 166
 167 void
 168 Lily_parser::clear ()
 169 {
 170   if (lexer_)
 171     {
 172       while (lexer_->has_scope ())
 173         lexer_->remove_scope ();
 174     }
 175
 176   lexer_ = 0;
 177 }
 178
 179 char const *
 180 Lily_parser::here_str0 () const
 181 {
 182   return lexer_->here_str0 ();
 183 }
 184
 185 void
 186 Lily_parser::parser_error (string s)
 187 {
 188   lexer_->here_input ().error (_ (s.c_str ()));
 189   error_level_ = 1;
 190 }
 191
 192 void
 193 Lily_parser::parser_error (Input const &i, string s)
 194 {
 195   i.error (s);
 196   error_level_ = 1;
 197 }
 198
 199
 200
 201 IMPLEMENT_SMOBS (Lily_parser);
 202 IMPLEMENT_TYPE_P (Lily_parser, "ly:lily-parser?");
 203 IMPLEMENT_DEFAULT_EQUAL_P (Lily_parser);
 204
 205
 206 /****************************************************************
 207   OUTPUT-DEF
 208  ****************************************************************/
 209
 210 Output_def *
 211 get_layout (Lily_parser *parser)
 212 {
 213   SCM id = parser->lexer_->lookup_identifier ("$defaultlayout");
 214   Output_def *layout = unsmob_output_def (id);
 215   layout = layout ? layout->clone () : new Output_def;
 216   layout->set_variable (ly_symbol2scm ("is-layout"), SCM_BOOL_T);
 217
 218   return layout;
 219 }
 220
 221 Output_def *
 222 get_midi (Lily_parser *parser)
 223 {
 224   SCM id = parser->lexer_->lookup_identifier ("$defaultmidi");
 225   Output_def *layout = unsmob_output_def (id);
 226   layout = layout ? layout->clone () : new Output_def;
 227   layout->set_variable (ly_symbol2scm ("is-midi"), SCM_BOOL_T);
 228   return layout;
 229 }
 230
 231 /* Return a copy of the top of $papers stack, or $defaultpaper if the
 232  * stack is empty */
 233 Output_def *
 234 get_paper (Lily_parser *parser)
 235 {
 236   SCM papers = parser->lexer_->lookup_identifier ("$papers");
 237   Output_def *layout = ((papers == SCM_UNDEFINED) || scm_is_null (papers)) ?
 238     0 : unsmob_output_def (scm_car (papers));
 239   SCM default_paper = parser->lexer_->lookup_identifier ("$defaultpaper");
 240   layout = layout ? layout : unsmob_output_def (default_paper);
 241
 242   layout = layout ? dynamic_cast<Output_def *> (layout->clone ()) : new Output_def;
 243   layout->set_variable (ly_symbol2scm ("is-paper"), SCM_BOOL_T);
 244   return layout;
 245 }
 246
 247 /* Initialize (reset) the $papers stack */
 248 void
 249 init_papers (Lily_parser *parser)
 250 {
 251   parser->lexer_->set_identifier (ly_symbol2scm ("$papers"), SCM_EOL);
 252 }
 253
 254 /* Push a paper on top of $papers stack */
 255 void
 256 push_paper (Lily_parser *parser, Output_def *paper)
 257 {
 258   parser->lexer_->set_identifier (ly_symbol2scm ("$papers"),
 259                                   scm_cons (paper->self_scm (),
 260                                             parser->lexer_->lookup_identifier ("$papers")));
 261 }
 262
 263 /* Pop a paper from $papers stack */
 264 void
 265 pop_paper (Lily_parser *parser)
 266 {
 267   if (! scm_is_null (parser->lexer_->lookup_identifier ("$papers")))
 268     parser->lexer_->set_identifier (ly_symbol2scm ("$papers"),
 269                                     scm_cdr (parser->lexer_->lookup_identifier ("$papers")));
 270 }
 271
 272 /* Change the paper on top of $papers stack */
 273 void
 274 set_paper (Lily_parser *parser, Output_def *paper)
 275 {
 276   scm_set_car_x (parser->lexer_->lookup_identifier ("$papers"), paper->self_scm ());
 277 }
 278
 279 SCM
 280 get_header (Lily_parser *parser)
 281 {
 282   SCM id = parser->lexer_->lookup_identifier ("$defaultheader");
 283   if (!ly_is_module (id))
 284     id = parser->make_scope ();
 285   else
 286     {
 287       SCM nid = parser->make_scope ();
 288       ly_module_copy (nid, id);
 289       id = nid;
 290     }
 291
 292   return id;
 293 }
 294
 295 SCM
 296 Lily_parser::make_scope () const
 297 {
 298   SCM module = ly_make_anonymous_module (be_safe_global);
 299   return module;
 300 }