lily/lily-lexer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 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 "lily-lexer.hh"
  21
  22 #include <cctype>
  23 #include <sstream>
  24 using namespace std;
  25
  26 #include "context.hh" // for nested_property_alist
  27 #include "international.hh"
  28 #include "interval.hh"
  29 #include "keyword.hh"
  30 #include "main.hh"
  31 #include "moment.hh"
  32 #include "parser.hh"
  33 #include "scm-hash.hh"
  34 #include "source-file.hh"
  35 #include "warn.hh"
  36 #include "program-option.hh"
  37 #include "lily-parser.hh"
  38
  39 static Keyword_ent the_key_tab[]
  40 = {
  41   {"accepts", ACCEPTS},
  42   {"addlyrics", ADDLYRICS},
  43   {"alias", ALIAS},
  44   {"alternative", ALTERNATIVE},
  45   {"book", BOOK},
  46   {"bookpart", BOOKPART},
  47   {"change", CHANGE},
  48   {"chordmode", CHORDMODE},
  49   {"chords", CHORDS},
  50   {"consists", CONSISTS},
  51   {"context", CONTEXT},
  52   {"default", DEFAULT},
  53   {"defaultchild", DEFAULTCHILD},
  54   {"denies", DENIES},
  55   {"description", DESCRIPTION},
  56   {"drummode", DRUMMODE},
  57   {"drums", DRUMS},
  58   {"figuremode", FIGUREMODE},
  59   {"figures", FIGURES},
  60   {"grobdescriptions", GROBDESCRIPTIONS},
  61   {"header", HEADER},
  62   {"key", KEY},
  63   {"layout", LAYOUT},
  64   {"lyricmode", LYRICMODE},
  65   {"lyrics", LYRICS},
  66   {"lyricsto", LYRICSTO},
  67   {"mark", MARK},
  68   {"markup", MARKUP},
  69   {"markuplines", MARKUPLINES},
  70   {"midi", MIDI},
  71   {"name", NAME},
  72   {"new", NEWCONTEXT},
  73   {"notemode", NOTEMODE},
  74   {"once", ONCE},
  75   {"override", OVERRIDE},
  76   {"paper", PAPER},
  77   {"partial", PARTIAL},
  78   {"relative", RELATIVE},
  79   {"remove", REMOVE},
  80   {"repeat", REPEAT},
  81   {"rest", REST},
  82   {"revert", REVERT},
  83   {"score", SCORE},
  84   {"sequential", SEQUENTIAL},
  85   {"set", SET},
  86   {"simultaneous", SIMULTANEOUS},
  87   {"skip", SKIP},
  88   {"tempo", TEMPO},
  89   {"time", TIME_T},
  90   {"times", TIMES},
  91   {"transpose", TRANSPOSE},
  92   {"type", TYPE},
  93   {"unset", UNSET},
  94   {"with", WITH},
  95   {0, 0}
  96 };
  97
  98 Lily_lexer::Lily_lexer (Sources *sources, Lily_parser *parser)
  99 {
 100   parser_ = parser;
 101   keytable_ = new Keyword_table (the_key_tab);
 102   chordmodifier_tab_ = SCM_EOL;
 103   pitchname_tab_stack_ = SCM_EOL;
 104   sources_ = sources;
 105   scopes_ = SCM_EOL;
 106   error_level_ = 0;
 107   is_main_input_ = false;
 108   start_module_ = SCM_EOL;
 109   chord_repetition_ = Chord_repetition ();
 110   smobify_self ();
 111
 112   add_scope (ly_make_module (false));
 113   push_note_state (scm_c_make_hash_table (0));
 114   chordmodifier_tab_ = scm_make_vector (scm_from_int (1), SCM_EOL);
 115 }
 116
 117 Lily_lexer::Lily_lexer (Lily_lexer const &src, Lily_parser *parser)
 118   : Includable_lexer ()
 119 {
 120   parser_ = parser;
 121   keytable_ = (src.keytable_) ? new Keyword_table (*src.keytable_) : 0;
 122   chordmodifier_tab_ = src.chordmodifier_tab_;
 123   pitchname_tab_stack_ = src.pitchname_tab_stack_;
 124   sources_ = src.sources_;
 125   start_module_ = SCM_EOL;
 126   chord_repetition_ = src.chord_repetition_;
 127
 128   error_level_ = src.error_level_;
 129   is_main_input_ = src.is_main_input_;
 130
 131   scopes_ = SCM_EOL;
 132
 133   smobify_self ();
 134
 135   SCM scopes = SCM_EOL;
 136   SCM *tail = &scopes;
 137   for (SCM s = src.scopes_; scm_is_pair (s); s = scm_cdr (s))
 138     {
 139       SCM newmod = ly_make_module (false);
 140       ly_module_copy (newmod, scm_car (s));
 141       *tail = scm_cons (newmod, SCM_EOL);
 142       tail = SCM_CDRLOC (*tail);
 143     }
 144
 145   scopes_ = scopes;
 146   push_note_state (scm_c_make_hash_table (0));
 147 }
 148
 149 Lily_lexer::~Lily_lexer ()
 150 {
 151   delete keytable_;
 152 }
 153
 154 void
 155 Lily_lexer::add_scope (SCM module)
 156 {
 157   ly_reexport_module (scm_current_module ());
 158   if (!scm_is_pair (scopes_))
 159     start_module_ = scm_current_module ();
 160
 161   for (SCM s = scopes_; scm_is_pair (s); s = scm_cdr (s))
 162     ly_use_module (module, scm_car (s));
 163   scopes_ = scm_cons (module, scopes_);
 164
 165   set_current_scope ();
 166 }
 167 bool
 168 Lily_lexer::has_scope () const
 169 {
 170   return scm_is_pair (scopes_);
 171 }
 172
 173 SCM
 174 Lily_lexer::remove_scope ()
 175 {
 176   SCM sc = scm_car (scopes_);
 177   scopes_ = scm_cdr (scopes_);
 178   set_current_scope ();
 179   return sc;
 180 }
 181
 182 SCM
 183 Lily_lexer::set_current_scope ()
 184 {
 185   SCM old = scm_current_module ();
 186
 187   if (scm_is_pair (scopes_))
 188     scm_set_current_module (scm_car (scopes_));
 189   else
 190     scm_set_current_module (start_module_);
 191
 192   return old;
 193 }
 194
 195 int
 196 Lily_lexer::lookup_keyword (string s)
 197 {
 198   return keytable_->lookup (s.c_str ());
 199 }
 200
 201 SCM
 202 Lily_lexer::keyword_list () const
 203 {
 204   if (!keytable_)
 205     return SCM_EOL;
 206
 207   SCM l = SCM_EOL;
 208   SCM *tail = &l;
 209   for (vsize i = 0; i < keytable_->table_.size (); i++)
 210     {
 211       *tail = scm_acons (scm_from_locale_string (keytable_->table_[i].name_),
 212                          scm_from_int (keytable_->table_[i].tokcode_),
 213                          SCM_EOL);
 214
 215       tail = SCM_CDRLOC (*tail);
 216     }
 217
 218   return l;
 219 }
 220
 221 SCM
 222 Lily_lexer::lookup_identifier_symbol (SCM sym)
 223 {
 224   for (SCM s = scopes_; scm_is_pair (s); s = scm_cdr (s))
 225     {
 226       SCM var = ly_module_lookup (scm_car (s), sym);
 227       if (var != SCM_BOOL_F)
 228         return scm_variable_ref (var);
 229     }
 230
 231   return SCM_UNDEFINED;
 232 }
 233
 234 SCM
 235 Lily_lexer::lookup_identifier (string name)
 236 {
 237   return lookup_identifier_symbol (ly_symbol2scm (name.c_str ()));
 238 }
 239
 240 void
 241 Lily_lexer::start_main_input ()
 242 {
 243   yy_flex_debug = get_program_option ("debug-lexer");
 244   parser_->set_yydebug (get_program_option ("debug-parser"));
 245
 246   new_input (main_input_name_, sources_);
 247
 248   scm_module_define (scm_car (scopes_),
 249                      ly_symbol2scm ("input-file-name"),
 250                      ly_string2scm (main_input_name_));
 251 }
 252
 253 void
 254 Lily_lexer::new_input (string str, string d, Sources *ss)
 255 {
 256   Includable_lexer::new_input (str, d, ss);
 257 }
 258
 259 void
 260 Lily_lexer::new_input (string str, Sources *ss)
 261 {
 262   if (is_main_input_ && be_safe_global)
 263     {
 264       LexerError (_ ("include files are not allowed in safe mode").c_str ());
 265       return;
 266     }
 267
 268   Includable_lexer::new_input (str, ss);
 269 }
 270
 271 // PATH is either a single symbol (or string) or a list of symbols
 272 // giving the path to a nested property.  A symbol is treated the same
 273 // as a list of length 1.
 274 void
 275 Lily_lexer::set_identifier (SCM path, SCM val)
 276 {
 277   SCM sym = path;
 278   if (scm_is_string (path))
 279     sym = scm_string_to_symbol (path);
 280   else if (scm_is_pair (path))
 281     {
 282       sym = scm_car (path);
 283       path = scm_cdr (path);
 284     }
 285
 286   if (scm_is_symbol (sym))
 287     {
 288       if (lookup_keyword (ly_symbol2string (sym)) >= 0)
 289         {
 290           string symstr = ly_symbol2string (sym);
 291           warning (_f ("identifier name is a keyword: `%s'", symstr.c_str ()));
 292         }
 293
 294       SCM mod = scm_car (scopes_);
 295
 296       if (scm_is_pair (path))
 297         {
 298           SCM prev = ly_module_lookup (mod, sym);
 299           if (prev != SCM_BOOL_F)
 300             val = nested_property_alist (scm_variable_ref (prev), path, val);
 301         }
 302       scm_module_define (mod, sym, val);
 303     }
 304   else
 305     programming_error ("identifier is not a symbol");
 306 }
 307
 308 void
 309 Lily_lexer::LexerError (char const *s)
 310 {
 311   if (include_stack_.empty ())
 312     message (_f ("error at EOF: %s", s) + "\n");
 313   else
 314     {
 315       error_level_ |= 1;
 316       Input spot (*lexloc_);
 317       spot.error (s);
 318     }
 319 }
 320
 321 char
 322 Lily_lexer::escaped_char (char c) const
 323 {
 324   switch (c)
 325     {
 326     case 'n':
 327       return '\n';
 328     case 't':
 329       return '\t';
 330     case '\'':
 331     case '\"':
 332     case '\\':
 333       return c;
 334     }
 335   return 0;
 336 }
 337
 338 Input
 339 Lily_lexer::here_input () const
 340 {
 341   return Input (*lexloc_);
 342 }
 343
 344 void
 345 Lily_lexer::prepare_for_next_token ()
 346 {
 347   last_input_ = here_input ();
 348 }
 349
 350 /**
 351    Since we don't create the buffer state from the bytes directly, we
 352    don't know about the location of the lexer. Add this as a
 353    YY_USER_ACTION */
 354 void
 355 Lily_lexer::add_lexed_char (int count)
 356 {
 357   char const *start = here_str0 ();
 358   lexloc_->set (get_source_file (),
 359                 start, start + count);
 360   char_count_stack_.back () += count;
 361 }
 362
 363 #include "ly-smobs.icc"
 364
 365 IMPLEMENT_SMOBS (Lily_lexer);
 366 IMPLEMENT_TYPE_P (Lily_lexer, "ly:lily-lexer?");
 367 IMPLEMENT_DEFAULT_EQUAL_P (Lily_lexer);
 368
 369 SCM
 370 Lily_lexer::mark_smob (SCM s)
 371 {
 372   ASSERT_LIVE_IS_ALLOWED ();
 373
 374   Lily_lexer *lexer = (Lily_lexer *) SCM_CELL_WORD_1 (s);
 375
 376   scm_gc_mark (lexer->chordmodifier_tab_);
 377   if (lexer->parser_)
 378     scm_gc_mark (lexer->parser_->self_scm ());
 379   scm_gc_mark (lexer->pitchname_tab_stack_);
 380   scm_gc_mark (lexer->start_module_);
 381   return lexer->scopes_;
 382 }
 383
 384 int
 385 Lily_lexer::print_smob (SCM s, SCM port, scm_print_state*)
 386 {
 387   Lily_lexer *lexer = Lily_lexer::unsmob (s);
 388
 389   scm_puts ("#<Lily_lexer ", port);
 390   scm_display (lexer->scopes_, port);
 391   scm_puts (" >", port);
 392   return 1;
 393 }
 394
 395 bool
 396 Lily_lexer::is_clean () const
 397 {
 398   return include_stack_.empty ();
 399 }