lily/lily-lexer.cc

   1 /*
   2   lily-lexer.cc -- implement Lily_lexer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "lily-lexer.hh"
  10
  11 #include <cctype>
  12 #include <sstream>
  13 using namespace std;
  14
  15 #include "international.hh"
  16 #include "interval.hh"
  17 #include "keyword.hh"
  18 #include "main.hh"
  19 #include "moment.hh"
  20 #include "parser.hh"
  21 #include "scm-hash.hh"
  22 #include "source-file.hh"
  23 #include "warn.hh"
  24 #include "program-option.hh"
  25 #include "lily-parser.hh"
  26
  27 static Keyword_ent the_key_tab[]
  28 = {
  29   {"accepts", ACCEPTS},
  30   {"addlyrics", ADDLYRICS},
  31   {"alias", ALIAS},
  32   {"alternative", ALTERNATIVE},
  33   {"book", BOOK},
  34   {"change", CHANGE},
  35   {"chordmode", CHORDMODE},
  36   {"chords", CHORDS},
  37   {"consists", CONSISTS},
  38   {"context", CONTEXT},
  39   {"default", DEFAULT},
  40   {"defaultchild", DEFAULTCHILD},
  41   {"denies", DENIES},
  42   {"description", DESCRIPTION},
  43   {"drummode", DRUMMODE},
  44   {"drums", DRUMS},
  45   {"figuremode", FIGUREMODE},
  46   {"figures", FIGURES},
  47   {"grobdescriptions", GROBDESCRIPTIONS},
  48   {"header", HEADER},
  49   {"key", KEY},
  50   {"layout", LAYOUT},
  51   {"lyricmode", LYRICMODE},
  52   {"lyrics", LYRICS},
  53   {"lyricsto", LYRICSTO},
  54   {"mark", MARK},
  55   {"markup", MARKUP},
  56   {"markuplines", MARKUPLINES},
  57   {"midi", MIDI},
  58   {"name", NAME},
  59   {"new", NEWCONTEXT},
  60   {"notemode", NOTEMODE},
  61   {"objectid", OBJECTID},
  62   {"once", ONCE},
  63   {"override", OVERRIDE},
  64   {"paper", PAPER},
  65   {"partial", PARTIAL},
  66   {"relative", RELATIVE},
  67   {"remove", REMOVE},
  68   {"repeat", REPEAT},
  69   {"rest", REST},
  70   {"revert", REVERT},
  71   {"score", SCORE},
  72   {"sequential", SEQUENTIAL},
  73   {"set", SET},
  74   {"simultaneous", SIMULTANEOUS},
  75   {"skip", SKIP},
  76   {"tempo", TEMPO},
  77   {"time", TIME_T},
  78   {"times", TIMES},
  79   {"transpose", TRANSPOSE},
  80   {"type", TYPE},
  81   {"unset", UNSET},
  82   {"with", WITH},
  83   {0, 0}
  84 };
  85
  86 Lily_lexer::Lily_lexer (Sources *sources, Lily_parser *parser)
  87 {
  88   parser_ = parser;
  89   keytable_ = new Keyword_table (the_key_tab);
  90   chordmodifier_tab_ = SCM_EOL;
  91   pitchname_tab_stack_ = SCM_EOL;
  92   sources_ = sources;
  93   scopes_ = SCM_EOL;
  94   error_level_ = 0;
  95   is_main_input_ = false;
  96   start_module_ = SCM_EOL;
  97   smobify_self ();
  98
  99   add_scope (ly_make_anonymous_module (false));
 100   push_note_state (scm_c_make_hash_table (0));
 101   chordmodifier_tab_ = scm_make_vector (scm_from_int (1), SCM_EOL);
 102 }
 103
 104 Lily_lexer::Lily_lexer (Lily_lexer const &src, Lily_parser *parser)
 105   : Includable_lexer ()
 106 {
 107   parser_ = parser;
 108   keytable_ = (src.keytable_) ? new Keyword_table (*src.keytable_) : 0;
 109   chordmodifier_tab_ = src.chordmodifier_tab_;
 110   pitchname_tab_stack_ = src.pitchname_tab_stack_;
 111   sources_ = src.sources_;
 112   start_module_ = SCM_EOL;
 113
 114   error_level_ = src.error_level_;
 115   is_main_input_ = src.is_main_input_;
 116
 117   scopes_ = SCM_EOL;
 118
 119   smobify_self ();
 120
 121   SCM scopes = SCM_EOL;
 122   SCM *tail = &scopes;
 123   for (SCM s = src.scopes_; scm_is_pair (s); s = scm_cdr (s))
 124     {
 125       SCM newmod = ly_make_anonymous_module (false);
 126       ly_module_copy (newmod, scm_car (s));
 127       *tail = scm_cons (newmod, SCM_EOL);
 128       tail = SCM_CDRLOC (*tail);
 129     }
 130
 131   scopes_ = scopes;
 132   push_note_state (scm_c_make_hash_table (0));
 133 }
 134
 135 Lily_lexer::~Lily_lexer ()
 136 {
 137   delete keytable_;
 138 }
 139
 140 void
 141 Lily_lexer::add_scope (SCM module)
 142 {
 143   ly_reexport_module (scm_current_module ());
 144   if (!scm_is_pair (scopes_))
 145     start_module_ = scm_current_module ();
 146
 147   for (SCM s = scopes_; scm_is_pair (s); s = scm_cdr (s))
 148     ly_use_module (module, scm_car (s));
 149   scopes_ = scm_cons (module, scopes_);
 150
 151   set_current_scope ();
 152 }
 153 bool
 154 Lily_lexer::has_scope () const
 155 {
 156   return scm_is_pair (scopes_);
 157 }
 158
 159 SCM
 160 Lily_lexer::remove_scope ()
 161 {
 162   SCM sc = scm_car (scopes_);
 163   scopes_ = scm_cdr (scopes_);
 164   set_current_scope ();
 165   return sc;
 166 }
 167
 168 SCM
 169 Lily_lexer::set_current_scope ()
 170 {
 171   SCM old = scm_current_module ();
 172
 173   if (scm_is_pair (scopes_))
 174     scm_set_current_module (scm_car (scopes_));
 175   else
 176     scm_set_current_module (start_module_);
 177
 178   return old;
 179 }
 180
 181 int
 182 Lily_lexer::lookup_keyword (string s)
 183 {
 184   return keytable_->lookup (s.c_str ());
 185 }
 186
 187 SCM
 188 Lily_lexer::keyword_list () const
 189 {
 190   if (!keytable_)
 191     return SCM_EOL;
 192
 193   SCM l = SCM_EOL;
 194   SCM *tail = &l;
 195   for (vsize i = 0; i < keytable_->table_.size (); i++)
 196     {
 197       *tail = scm_acons (scm_from_locale_string (keytable_->table_[i].name_),
 198                          scm_from_int (keytable_->table_[i].tokcode_),
 199                          SCM_EOL);
 200
 201       tail = SCM_CDRLOC (*tail);
 202     }
 203
 204   return l;
 205 }
 206
 207 SCM
 208 Lily_lexer::lookup_identifier_symbol (SCM sym)
 209 {
 210   for (SCM s = scopes_; scm_is_pair (s); s = scm_cdr (s))
 211     {
 212       SCM var = ly_module_lookup (scm_car (s), sym);
 213       if (var != SCM_BOOL_F)
 214         return scm_variable_ref (var);
 215     }
 216
 217   return SCM_UNDEFINED;
 218 }
 219
 220 SCM
 221 Lily_lexer::lookup_identifier (string name)
 222 {
 223   return lookup_identifier_symbol (ly_symbol2scm (name.c_str ()));
 224 }
 225
 226 void
 227 Lily_lexer::start_main_input ()
 228 {
 229   yy_flex_debug = get_program_option ("debug-lexer");
 230   parser_->set_yydebug (get_program_option ("debug-parser"));
 231
 232
 233   new_input (main_input_name_, sources_);
 234
 235   scm_module_define (scm_car (scopes_),
 236                      ly_symbol2scm ("input-file-name"),
 237                      ly_string2scm (main_input_name_));
 238 }
 239
 240 void
 241 Lily_lexer::new_input (string str, string d, Sources *ss)
 242 {
 243   Includable_lexer::new_input (str, d, ss);
 244 }
 245
 246 void
 247 Lily_lexer::new_input (string str, Sources *ss)
 248 {
 249   if (is_main_input_ && be_safe_global)
 250     {
 251       LexerError (_ ("include files are not allowed in safe mode").c_str ());
 252       return;
 253     }
 254
 255   Includable_lexer::new_input (str, ss);
 256 }
 257
 258 void
 259 Lily_lexer::set_identifier (SCM name, SCM s)
 260 {
 261   SCM sym = name;
 262   if (scm_is_string (name))
 263     sym = scm_string_to_symbol (name);
 264
 265   if (scm_is_symbol (sym))
 266     {
 267       if (lookup_keyword (ly_symbol2string (sym)) >= 0)
 268         {
 269           string symstr = ly_symbol2string (sym);
 270           warning (_f ("identifier name is a keyword: `%s'", symstr.c_str ()));
 271         }
 272
 273       SCM mod = scm_car (scopes_);
 274
 275       scm_module_define (mod, sym, s);
 276     }
 277   else
 278     programming_error ("identifier is not a symbol");
 279 }
 280
 281 void
 282 Lily_lexer::LexerError (char const *s)
 283 {
 284   if (include_stack_.empty ())
 285     message (_f ("error at EOF: %s", s) + "\n");
 286   else
 287     {
 288       error_level_ |= 1;
 289       Input spot (*lexloc);
 290       spot.error (s);
 291     }
 292 }
 293
 294 char
 295 Lily_lexer::escaped_char (char c) const
 296 {
 297   switch (c)
 298     {
 299     case 'n':
 300       return '\n';
 301     case 't':
 302       return '\t';
 303     case '\'':
 304     case '\"':
 305     case '\\':
 306       return c;
 307     }
 308   return 0;
 309 }
 310
 311 Input
 312 Lily_lexer::here_input () const
 313 {
 314   return Input (*lexloc);
 315 }
 316
 317 void
 318 Lily_lexer::prepare_for_next_token ()
 319 {
 320   last_input_ = here_input ();
 321 }
 322
 323 /**
 324    Since we don't create the buffer state from the bytes directly, we
 325    don't know about the location of the lexer. Add this as a
 326    YY_USER_ACTION */
 327 void
 328 Lily_lexer::add_lexed_char (int count)
 329 {
 330   char const *start = here_str0 ();
 331   lexloc->set (get_source_file (),
 332                start, start + count);
 333   char_count_stack_.back () += count;
 334 }
 335
 336 #include "ly-smobs.icc"
 337
 338 IMPLEMENT_SMOBS (Lily_lexer);
 339 IMPLEMENT_TYPE_P (Lily_lexer, "ly:lily-lexer?");
 340 IMPLEMENT_DEFAULT_EQUAL_P (Lily_lexer);
 341
 342 SCM
 343 Lily_lexer::mark_smob (SCM s)
 344 {
 345   ASSERT_LIVE_IS_ALLOWED ();
 346
 347   Lily_lexer *lexer = (Lily_lexer *) SCM_CELL_WORD_1 (s);
 348
 349   scm_gc_mark (lexer->chordmodifier_tab_);
 350   if (lexer->parser_)
 351     scm_gc_mark (lexer->parser_->self_scm ());
 352   scm_gc_mark (lexer->pitchname_tab_stack_);
 353   scm_gc_mark (lexer->start_module_);
 354   return lexer->scopes_;
 355 }
 356
 357 int
 358 Lily_lexer::print_smob (SCM s, SCM port, scm_print_state*)
 359 {
 360   Lily_lexer *lexer = Lily_lexer::unsmob (s);
 361
 362   scm_puts ("#<Lily_lexer ", port);
 363   scm_display (lexer->scopes_, port);
 364   scm_puts (" >", port);
 365   return 1;
 366 }