| 1 | |
| 2 | /* Copyright (c) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005 by Arkkra Enterprises */ |
| 3 | /* All rights reserved */ |
| 4 | |
| 5 | /* functions called at parse time to deal with beaming. */ |
| 6 | |
| 7 | |
| 8 | #include "defines.h" |
| 9 | #include "structs.h" |
| 10 | #include "globals.h" |
| 11 | |
| 12 | |
| 13 | static void subbeam P((struct SSV *ssv_p, RATIONAL outer_time, int obi, |
| 14 | struct GRPSYL *begin_gs_p, struct GRPSYL *end_gs_p)); |
| 15 | static struct GRPSYL *verify_crossbeam P((struct GRPSYL *gs_p, |
| 16 | struct GRPSYL *other_gs_p, RATIONAL start_time, RATIONAL *end_time_p, |
| 17 | int staffno, int size)); |
| 18 | static void |
| 19 | slopelencheck P((struct GRPSYL *first_p, struct GRPSYL *last_p, char *bmtype)); |
| 20 | |
| 21 | |
| 22 | /* this function will get called whenever a group is not the start or end |
| 23 | * of a custom beam group. This will fill in the beamloc based on past |
| 24 | * history. If we were most recently in a custom beam group, we still are. |
| 25 | * If we weren't before, we aren't now either. The non-custom beaming |
| 26 | * gets done later after we have collected a whole bar in do_beaming() |
| 27 | * which is called via do_bar(). */ |
| 28 | |
| 29 | void |
| 30 | setbeamloc(curr_grp_p, last_grp_p) |
| 31 | |
| 32 | struct GRPSYL *curr_grp_p; /* the group we're working on */ |
| 33 | struct GRPSYL *last_grp_p; /* the last group we did */ |
| 34 | |
| 35 | { |
| 36 | if (curr_grp_p->grpvalue == GV_ZERO) { |
| 37 | /* grace notes don't get handled here */ |
| 38 | curr_grp_p->beamloc = NOITEM; |
| 39 | return; |
| 40 | } |
| 41 | |
| 42 | /* if the previous group is a grace group, that doesn't count. Back |
| 43 | * up in the list to the first non-grace or beginning of list */ |
| 44 | for ( ; last_grp_p != (struct GRPSYL *) 0 |
| 45 | && last_grp_p->grpvalue == GV_ZERO; |
| 46 | last_grp_p = last_grp_p->prev) { |
| 47 | ; |
| 48 | } |
| 49 | |
| 50 | if (last_grp_p != (struct GRPSYL *) 0) { |
| 51 | |
| 52 | switch (last_grp_p->beamloc) { |
| 53 | |
| 54 | case STARTITEM: |
| 55 | case INITEM: |
| 56 | curr_grp_p->beamto = last_grp_p->beamto; |
| 57 | /* Make sure notes are 8th or shorter. Spaces (which |
| 58 | * are allowed in cross-staff beams) can be longer. */ |
| 59 | if (curr_grp_p->basictime < 8) { |
| 60 | /* At this point, spaces are still |
| 61 | * pseudo-pitches, so have to figure out |
| 62 | * if this group is really notes */ |
| 63 | int letter; /* pitch */ |
| 64 | int n; /* index through notelist */ |
| 65 | for (n = 0; n < curr_grp_p->nnotes; n++) { |
| 66 | letter = curr_grp_p->notelist[n].letter; |
| 67 | if ((letter >= 'a' && letter <= 'g') || |
| 68 | letter == PP_NO_PITCH) { |
| 69 | yyerror("beamed notes must be 8th or shorter"); |
| 70 | break; |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | /* if previous began beaming, we must be inside now */ |
| 76 | /* if in beam before, we still are */ |
| 77 | curr_grp_p->beamloc = INITEM; |
| 78 | break; |
| 79 | |
| 80 | case ENDITEM: |
| 81 | case NOITEM: |
| 82 | default: |
| 83 | /* if previous was ending beaming, or |
| 84 | * we weren't inside a beam, must be no beam now */ |
| 85 | curr_grp_p->beamloc = NOITEM; |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | else { |
| 90 | /* nothing specified before, so no beam */ |
| 91 | curr_grp_p->beamloc = NOITEM; |
| 92 | } |
| 93 | } |
| 94 | \f |
| 95 | |
| 96 | /* take a quick jaunt through a GRPSYL list, seeing if custom |
| 97 | * beaming was already done. If so, return YES, otherwise NO. |
| 98 | * If there are any non-grace groups with beaming info, there must |
| 99 | * have been custom beaming. Also, verify that user didn't attempt to |
| 100 | * custom beam a mixture of normal and cue size notes, |
| 101 | * or try to put illegal rests or spaces inside a beam. |
| 102 | * Spaces are only allowed in cross-staff beams, unless user explicitly |
| 103 | * says to beam across spaces. Rests are also only allowed in beams if |
| 104 | * the user explicitly states they should be. Rests and spaces cannot be on |
| 105 | * the ends, and must be eighth note or shorter. |
| 106 | * We allow beaming together chords that are stemmed to another staff |
| 107 | * only if all such instances are to the same staff--not some to staff above |
| 108 | * and others to staff below--because beaming involving 3 staffs at once is |
| 109 | * just too hard to deal with. |
| 110 | * Also check that any esbm has at least 2 notes before and after it. |
| 111 | */ |
| 112 | |
| 113 | int |
| 114 | has_cust_beaming(grpsyl_p) |
| 115 | |
| 116 | struct GRPSYL *grpsyl_p; /* list of GRPSYLs to check */ |
| 117 | |
| 118 | { |
| 119 | int has = NO; |
| 120 | int size = GS_NORMAL; |
| 121 | int numnotes = 0; /* how many notes groups, for esbm check */ |
| 122 | short stemto = CS_SAME; /* to check for mixed CS_ABOVE/CS_BELOW */ |
| 123 | struct GRPSYL *start_p = 0; /* first beamed group */ |
| 124 | |
| 125 | for ( ; grpsyl_p != (struct GRPSYL *) NULL; |
| 126 | grpsyl_p = grpsyl_p->next) { |
| 127 | |
| 128 | if ((grpsyl_p->grpvalue != GV_ZERO) |
| 129 | && (grpsyl_p->beamloc != NOITEM)) { |
| 130 | /* have non-grace with beam info set */ |
| 131 | has = YES; |
| 132 | |
| 133 | /* check for size or cross-staff stem mixtures */ |
| 134 | if (grpsyl_p->beamloc == STARTITEM) { |
| 135 | size = grpsyl_p->grpsize; |
| 136 | numnotes = 0; |
| 137 | stemto = CS_SAME; |
| 138 | } |
| 139 | /* check for size mixture. But only do non-cross-staff |
| 140 | * beams here, because it's a lot easier to do the |
| 141 | * cross-staff beam check in chk_crossbeams() */ |
| 142 | else if (grpsyl_p->grpsize != size |
| 143 | && grpsyl_p->beamto == CS_SAME) { |
| 144 | l_yyerror(grpsyl_p->inputfile, |
| 145 | grpsyl_p->inputlineno, |
| 146 | "can't beam normal and cue notes together"); |
| 147 | } |
| 148 | |
| 149 | if (grpsyl_p->grpcont != GC_NOTES) { |
| 150 | if (grpsyl_p->grpcont == GC_REST) { |
| 151 | if (grpsyl_p->basictime < 8) { |
| 152 | l_yyerror(grpsyl_p->inputfile, |
| 153 | grpsyl_p->inputlineno, |
| 154 | "rests inside a beam must be less than quarter note duration"); |
| 155 | } |
| 156 | if (grpsyl_p->beamloc != INITEM) { |
| 157 | l_yyerror(grpsyl_p->inputfile, |
| 158 | grpsyl_p->inputlineno, |
| 159 | "beam cannot %s with a rest", |
| 160 | grpsyl_p->beamloc == STARTITEM ? |
| 161 | "begin" : "end"); |
| 162 | } |
| 163 | } |
| 164 | else if (grpsyl_p->beamto == CS_SAME) { |
| 165 | if (grpsyl_p->beamloc != INITEM) { |
| 166 | l_yyerror(grpsyl_p->inputfile, |
| 167 | grpsyl_p->inputlineno, |
| 168 | "beam cannot begin or end with a space"); |
| 169 | } |
| 170 | if (grpsyl_p->basictime < 8) { |
| 171 | l_yyerror(grpsyl_p->inputfile, |
| 172 | grpsyl_p->inputlineno, |
| 173 | "spaces inside a beam must be less than quarter note duration"); |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | else if (grpsyl_p->grpvalue != GV_ZERO) { |
| 178 | numnotes++; |
| 179 | } |
| 180 | |
| 181 | if (grpsyl_p->stemto != CS_SAME) { |
| 182 | if (stemto != CS_SAME && grpsyl_p->stemto |
| 183 | != stemto) { |
| 184 | l_yyerror(grpsyl_p->inputfile, |
| 185 | grpsyl_p->inputlineno, |
| 186 | "beam cannot include chords with stems to both above and below staffs"); |
| 187 | } |
| 188 | stemto = grpsyl_p->stemto; |
| 189 | } |
| 190 | |
| 191 | if (grpsyl_p->beamloc == INITEM && |
| 192 | IS_STEMLEN_KNOWN(grpsyl_p->stemlen)) { |
| 193 | l_yyerror(grpsyl_p->inputfile, |
| 194 | grpsyl_p->inputlineno, |
| 195 | "stem len specification not allowed inside a beam"); |
| 196 | } |
| 197 | |
| 198 | if (grpsyl_p->beamloc == STARTITEM) { |
| 199 | start_p = grpsyl_p; |
| 200 | } |
| 201 | else if (grpsyl_p->beamloc == ENDITEM) { |
| 202 | if (start_p != 0) { |
| 203 | slopelencheck(start_p, grpsyl_p, "beam"); |
| 204 | start_p = 0; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | if (grpsyl_p->breakbeam == YES |
| 209 | && grpsyl_p->beamto == CS_SAME) { |
| 210 | if (numnotes < 2) { |
| 211 | l_warning(grpsyl_p->inputfile, |
| 212 | grpsyl_p->inputlineno, |
| 213 | "esbm must be preceeded by at least 2 beamed notes"); |
| 214 | grpsyl_p->breakbeam = NO; |
| 215 | } |
| 216 | else { |
| 217 | struct GRPSYL *g_p; |
| 218 | |
| 219 | /* Check that there are |
| 220 | * at least 2 following beamed notes */ |
| 221 | numnotes = 0; |
| 222 | for (g_p = grpsyl_p->next; g_p != 0; |
| 223 | g_p = g_p->next) { |
| 224 | if (g_p->grpcont == GC_NOTES && |
| 225 | g_p->grpvalue != GV_ZERO) { |
| 226 | numnotes++; |
| 227 | } |
| 228 | if (g_p->breakbeam == YES) { |
| 229 | break; |
| 230 | } |
| 231 | if (g_p->beamloc == ENDITEM) { |
| 232 | break; |
| 233 | } |
| 234 | } |
| 235 | if (numnotes < 2) { |
| 236 | l_warning(grpsyl_p->inputfile, |
| 237 | grpsyl_p->inputlineno, |
| 238 | "esbm must be followed by at least 2 beamed notes"); |
| 239 | grpsyl_p->breakbeam = NO; |
| 240 | } |
| 241 | else if (grpsyl_p->grpcont != GC_NOTES) { |
| 242 | /* User really should have put |
| 243 | * the esbm on the preceeding |
| 244 | * NOTES group. We'll be nice |
| 245 | * and move it for them. |
| 246 | */ |
| 247 | grpsyl_p->breakbeam = NO; |
| 248 | for (g_p = grpsyl_p->prev; |
| 249 | g_p->grpcont != GC_NOTES; |
| 250 | g_p = g_p->prev) { |
| 251 | ; |
| 252 | } |
| 253 | g_p->breakbeam = YES; |
| 254 | } |
| 255 | } |
| 256 | numnotes = 0; |
| 257 | } |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | return(has); |
| 262 | } |
| 263 | \f |
| 264 | |
| 265 | /* beam notes together according to user-specified default beaming style */ |
| 266 | |
| 267 | void |
| 268 | do_beaming(gs_p, grpsize, staffno, vno) |
| 269 | |
| 270 | struct GRPSYL *gs_p; /* list of GRPSYLs to do beaming on */ |
| 271 | int grpsize; /* GS_NORMAL or GS_SMALL |
| 272 | * (grace are handled separately) */ |
| 273 | int staffno; |
| 274 | int vno; /* voice number */ |
| 275 | |
| 276 | { |
| 277 | struct SSV *ssv_beaminfo_p; /* ssv having relevent beam info */ |
| 278 | register int n; /* index into beamstyle list */ |
| 279 | RATIONAL styletime; /* accumulated time to beam together */ |
| 280 | RATIONAL tot_time; /* cumulative grpsyl time */ |
| 281 | struct GRPSYL *first_p; /* first in beam group */ |
| 282 | struct GRPSYL *last_p; /* last in beam group */ |
| 283 | int stop; /* YES if need to stop beaming */ |
| 284 | int beamrests; /* if to include rests inside beams */ |
| 285 | int beamspaces; /* if to include spaces inside beams */ |
| 286 | short stemto = CS_SAME; /* check for mixed CS_ABOVE/CS_BELOW */ |
| 287 | short restart = NO; /* YES if could start another beam |
| 288 | * with current group, even though |
| 289 | * it can go with previous */ |
| 290 | |
| 291 | |
| 292 | |
| 293 | debug(4, "do_beaming file=%s line=%d grpsize=%d staff=%d voice=%d", |
| 294 | gs_p->inputfile, gs_p->inputlineno, grpsize, staffno, vno); |
| 295 | |
| 296 | /* if no default beaming scheme for this voice, then nothing to do-- |
| 297 | * any custom beaming would have already been done */ |
| 298 | ssv_beaminfo_p = vvpath(staffno, vno, BEAMSTLIST); |
| 299 | if (ssv_beaminfo_p->nbeam == 0) { |
| 300 | return; |
| 301 | } |
| 302 | |
| 303 | /* ok. We may need to do some beaming. Go through the beamstlist and |
| 304 | * see if there are any groups to beam together */ |
| 305 | |
| 306 | /* initialize */ |
| 307 | /* point to first non-grace group */ |
| 308 | for ( ; gs_p != (struct GRPSYL *) 0 && gs_p->grpcont == GC_NOTES |
| 309 | && gs_p->grpvalue == GV_ZERO; gs_p = gs_p->next) { |
| 310 | ; |
| 311 | } |
| 312 | |
| 313 | /* if no groups, nothing to do */ |
| 314 | if (gs_p == (struct GRPSYL *) 0) { |
| 315 | return; |
| 316 | } |
| 317 | |
| 318 | beamrests = vvpath(staffno, vno, BEAMSTLIST)->beamrests; |
| 319 | beamspaces = vvpath(staffno, vno, BEAMSTLIST)->beamspaces; |
| 320 | styletime = tot_time = Zero; |
| 321 | for (n = 0; n < ssv_beaminfo_p->nbeam; n++) { |
| 322 | styletime = radd(styletime, ssv_beaminfo_p->beamstlist[n]); |
| 323 | |
| 324 | if (GE(tot_time, styletime)) { |
| 325 | /* we're already past this beamstyle segment */ |
| 326 | continue; |
| 327 | } |
| 328 | |
| 329 | for (first_p = last_p = 0, stop = NO; |
| 330 | LT(tot_time, styletime); gs_p = gs_p->next) { |
| 331 | |
| 332 | if (gs_p == 0) { |
| 333 | /* Must be too few groups in measure. |
| 334 | * This error will already have been |
| 335 | * reported elsewhere. |
| 336 | */ |
| 337 | return; |
| 338 | } |
| 339 | |
| 340 | /* ignore grace */ |
| 341 | while (gs_p->grpvalue == GV_ZERO) { |
| 342 | gs_p = gs_p->next; |
| 343 | if (gs_p == 0) { |
| 344 | /* Must have tried to end a measure |
| 345 | * with grace. Already reported. */ |
| 346 | return; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | tot_time = radd(tot_time, gs_p->fulltime); |
| 351 | if (GE(tot_time, styletime)) { |
| 352 | /* This group puts us at or past |
| 353 | * the current beamstyle segment */ |
| 354 | stop = YES; |
| 355 | } |
| 356 | |
| 357 | /* only 8th and shorter get beamed */ |
| 358 | if (gs_p->basictime < 8 || (gs_p->grpcont == GC_SPACE && |
| 359 | beamspaces == NO) ) { |
| 360 | stop = YES; |
| 361 | } |
| 362 | else if (gs_p->grpcont == GC_REST && beamrests == NO) { |
| 363 | stop = YES; |
| 364 | } |
| 365 | else if (gs_p->grpsize != grpsize) { |
| 366 | /* Wrong size to beam on this call */ |
| 367 | stop = YES; |
| 368 | } |
| 369 | else if (gs_p->stemto != CS_SAME && stemto != CS_SAME |
| 370 | && gs_p->stemto != stemto) { |
| 371 | /* We don't allow beaming across three staffs, |
| 372 | * so have to stop current beam, but could |
| 373 | * possibly beam this group with following |
| 374 | * groups, as long as they don't have a |
| 375 | * conflicting stemto */ |
| 376 | stop = YES; |
| 377 | restart = YES; |
| 378 | } |
| 379 | else if (gs_p->grpcont == GC_NOTES && |
| 380 | LE(tot_time, styletime)) { |
| 381 | /* found something beam-able */ |
| 382 | if (first_p == 0) { |
| 383 | first_p = gs_p; |
| 384 | } |
| 385 | last_p = gs_p; |
| 386 | } |
| 387 | if (gs_p->stemto != CS_SAME) { |
| 388 | stemto = gs_p->stemto; |
| 389 | } |
| 390 | |
| 391 | if (stop == YES) { |
| 392 | if (first_p != 0 && last_p != 0 |
| 393 | && first_p != last_p) { |
| 394 | /* Disallow illegal combinations of |
| 395 | * slope and stem length */ |
| 396 | slopelencheck(first_p, last_p, "beam"); |
| 397 | |
| 398 | /* If there are subbeam groupings, |
| 399 | * do those. */ |
| 400 | subbeam(ssv_beaminfo_p, |
| 401 | rsub(styletime, ssv_beaminfo_p->beamstlist[n]), |
| 402 | n, first_p, last_p); |
| 403 | |
| 404 | /* mark beginning of beam group */ |
| 405 | first_p->beamloc = STARTITEM; |
| 406 | |
| 407 | /* mark all intermediate groups, |
| 408 | * skipping grace */ |
| 409 | for (first_p = first_p->next; |
| 410 | first_p != last_p; |
| 411 | first_p = first_p->next) { |
| 412 | |
| 413 | if (first_p->grpvalue |
| 414 | == GV_ZERO) { |
| 415 | continue; |
| 416 | } |
| 417 | |
| 418 | first_p->beamloc = INITEM; |
| 419 | |
| 420 | if (IS_STEMLEN_KNOWN(first_p->stemlen)) { |
| 421 | l_yyerror(first_p->inputfile, first_p->inputlineno, |
| 422 | "stem len specification not allowed inside a beam"); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /* mark the end of the beam group */ |
| 427 | last_p->beamloc = ENDITEM; |
| 428 | } |
| 429 | |
| 430 | /* Re-init for any more bunches to beam */ |
| 431 | first_p = last_p = 0; |
| 432 | stop = NO; |
| 433 | stemto = CS_SAME; |
| 434 | if (restart == YES) { |
| 435 | if (gs_p->grpcont == GC_NOTES) { |
| 436 | first_p = gs_p; |
| 437 | } |
| 438 | restart = NO; |
| 439 | } |
| 440 | } |
| 441 | } |
| 442 | } |
| 443 | } |
| 444 | \f |
| 445 | |
| 446 | /* Once a STARTITEM and ENDITEM groups of the regular beamstyle |
| 447 | * have been identified, go through them to see if there should |
| 448 | * be subgroups. If so, mark breakbeam = YES on the last group of |
| 449 | * each subgroup. |
| 450 | */ |
| 451 | |
| 452 | static void |
| 453 | subbeam(ssv_p, outer_time, obi, begin_gs_p, end_gs_p) |
| 454 | |
| 455 | struct SSV *ssv_p; /* to get beamstlist and subbeamstlist */ |
| 456 | RATIONAL outer_time; /* Time in measure when outer beam begins */ |
| 457 | int obi; /* outer beam index, subscript into ssv_p->beamstlist */ |
| 458 | struct GRPSYL *begin_gs_p; |
| 459 | struct GRPSYL *end_gs_p; |
| 460 | |
| 461 | { |
| 462 | int sbi; /* sub beam index, subscript of ssv_p->subbeamstlist */ |
| 463 | RATIONAL subgroup_time; /* duration of items in subbeamstlist */ |
| 464 | RATIONAL tot_time; /* sum of note groups in subbeaming */ |
| 465 | struct GRPSYL *gs_p; /* walk through groups */ |
| 466 | struct GRPSYL *last_notegroup_p;/* Most recent GC_NOTES GRPSYL */ |
| 467 | |
| 468 | |
| 469 | /* Check if more than one beam subgroup |
| 470 | * makes up the outer beam grouping. */ |
| 471 | if (ssv_p->nbeam == ssv_p->nsubbeam) { |
| 472 | /* There are no sub-beam groupings anywhere in the measure */ |
| 473 | return; |
| 474 | } |
| 475 | |
| 476 | /* Find the subbeamlist entry that matches with the outer beam entry */ |
| 477 | subgroup_time = Zero; |
| 478 | for (sbi = 0; LT(subgroup_time, outer_time); sbi++) { |
| 479 | subgroup_time = radd(subgroup_time, ssv_p->subbeamstlist[sbi]); |
| 480 | } |
| 481 | |
| 482 | if ( EQ(ssv_p->beamstlist[obi], ssv_p->subbeamstlist[sbi]) ) { |
| 483 | /* Outer and subbeam have the same time duration, |
| 484 | * so there aren't any subgroups in this outer beam grouping. */ |
| 485 | return; |
| 486 | } |
| 487 | |
| 488 | /* There are subgroups inside the outer beam grouping, |
| 489 | * so we may need to set one or more breakbeams. */ |
| 490 | subgroup_time = ssv_p->subbeamstlist[sbi]; |
| 491 | |
| 492 | /* If beam starts later than the outer beamstyle item begins, |
| 493 | * (e.g., if there was a rest at the beginning of the beam time), |
| 494 | * we have to count that time as already taken up from the subbeam. |
| 495 | */ |
| 496 | for (tot_time = Zero, gs_p = begin_gs_p->prev; gs_p != 0; |
| 497 | gs_p = gs_p->prev) { |
| 498 | tot_time = radd(tot_time, gs_p->fulltime); |
| 499 | } |
| 500 | tot_time = rsub(tot_time, outer_time); |
| 501 | last_notegroup_p = 0; |
| 502 | for (gs_p = begin_gs_p; gs_p != end_gs_p; gs_p = gs_p->next) { |
| 503 | |
| 504 | /* Grace notes are irrelevant */ |
| 505 | if (gs_p->grpvalue == GV_ZERO) { |
| 506 | continue; |
| 507 | } |
| 508 | |
| 509 | /* Remember where last note group is, in case we |
| 510 | * need to set breakbeam on it. */ |
| 511 | if (gs_p->grpcont == GC_NOTES) { |
| 512 | last_notegroup_p = gs_p; |
| 513 | } |
| 514 | |
| 515 | /* Add up group time values until the total equals |
| 516 | * or exceeds that of the subgroup. */ |
| 517 | tot_time = radd(tot_time, gs_p->fulltime); |
| 518 | if (LT(tot_time, subgroup_time)) { |
| 519 | /* not far enough yet */ |
| 520 | continue; |
| 521 | } |
| 522 | |
| 523 | /* If the value exceeds, there is a note spanning the |
| 524 | * subgroup boundary, so just ignore the subgrouping. */ |
| 525 | if (GT(tot_time, subgroup_time)) { |
| 526 | tot_time = rsub(tot_time, subgroup_time); |
| 527 | subgroup_time = ssv_p->subbeamstlist[++sbi]; |
| 528 | if (gs_p->grpcont != GC_NOTES) { |
| 529 | last_notegroup_p = 0; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | else { |
| 534 | /* A group ends right at the subbeam boundary. |
| 535 | * Set breakbeam on last group, if there was one. |
| 536 | */ |
| 537 | if (last_notegroup_p != 0) { |
| 538 | last_notegroup_p->breakbeam = YES; |
| 539 | } |
| 540 | |
| 541 | /* The current subbeam is finished. |
| 542 | * Move on to the next subbeam, if there is one. */ |
| 543 | if (++sbi < ssv_p->nsubbeam) { |
| 544 | subgroup_time = ssv_p->subbeamstlist[sbi]; |
| 545 | /* Since we know the subbeam we just |
| 546 | * finished ended exactly |
| 547 | * at the subbeam boundary, |
| 548 | * we set to time taken up so far |
| 549 | * by the new subbeam to zero. |
| 550 | */ |
| 551 | tot_time = Zero; |
| 552 | last_notegroup_p = 0; |
| 553 | } |
| 554 | } |
| 555 | } |
| 556 | } |
| 557 | \f |
| 558 | |
| 559 | /* alt groups must always have beamloc set, so fix them */ |
| 560 | |
| 561 | void |
| 562 | set_alt_beams(gs_p) |
| 563 | |
| 564 | struct GRPSYL *gs_p; /* a measure's worth of GRPSYLs for a voice */ |
| 565 | |
| 566 | { |
| 567 | struct GRPSYL *other_gs_p; /* group on other end of alt pair */ |
| 568 | |
| 569 | |
| 570 | debug(4, "set_alt_beams file=%s line=%d", |
| 571 | gs_p->inputfile, gs_p->inputlineno); |
| 572 | |
| 573 | /* walk through the list, fixing any alt groups */ |
| 574 | for ( ; gs_p != (struct GRPSYL *) 0; gs_p = gs_p->next) { |
| 575 | |
| 576 | /* check if is an alt pair */ |
| 577 | if (gs_p->slash_alt < 0) { |
| 578 | |
| 579 | if (gs_p->next == (struct GRPSYL *) 0) { |
| 580 | /* no second group in alt, will be flagged |
| 581 | * elsewhere */ |
| 582 | continue; |
| 583 | } |
| 584 | |
| 585 | /* set the pair as a beam group */ |
| 586 | gs_p->beamloc = STARTITEM; |
| 587 | gs_p->next->beamloc = ENDITEM; |
| 588 | |
| 589 | slopelencheck(gs_p, gs_p->next, "alt"); |
| 590 | |
| 591 | /* middle phase wants to have both notes in an alt group |
| 592 | * have their alt field set, so do that */ |
| 593 | gs_p->next->slash_alt = gs_p->slash_alt; |
| 594 | |
| 595 | /* adjust preceeding and following groups if necessary. |
| 596 | * If was already in a beam group, split off the other |
| 597 | * parts into their own groups or put flags on the |
| 598 | * extras if they are down to one group */ |
| 599 | |
| 600 | /* find previous normal group if any and adjust */ |
| 601 | for (other_gs_p = gs_p->prev; |
| 602 | other_gs_p != (struct GRPSYL *) 0; |
| 603 | other_gs_p = other_gs_p->prev) { |
| 604 | |
| 605 | if (other_gs_p->grpvalue != GV_ZERO) { |
| 606 | if (other_gs_p->grpcont == GC_REST) { |
| 607 | other_gs_p->beamloc = NOITEM; |
| 608 | } |
| 609 | else { |
| 610 | break; |
| 611 | } |
| 612 | } |
| 613 | } |
| 614 | |
| 615 | if (other_gs_p != (struct GRPSYL *) 0) { |
| 616 | |
| 617 | switch (other_gs_p->beamloc) { |
| 618 | |
| 619 | case INITEM: |
| 620 | other_gs_p->beamloc = ENDITEM; |
| 621 | break; |
| 622 | |
| 623 | case STARTITEM: |
| 624 | other_gs_p->beamloc = NOITEM; |
| 625 | break; |
| 626 | |
| 627 | default: |
| 628 | break; |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | /* now do the same for the following group */ |
| 633 | for (other_gs_p = gs_p->next->next; |
| 634 | other_gs_p != (struct GRPSYL *) 0; |
| 635 | other_gs_p = other_gs_p->next) { |
| 636 | |
| 637 | if (other_gs_p->grpvalue != GV_ZERO) { |
| 638 | if (other_gs_p->grpcont == GC_REST) { |
| 639 | other_gs_p->beamloc = NOITEM; |
| 640 | } |
| 641 | else { |
| 642 | break; |
| 643 | } |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | if (other_gs_p != (struct GRPSYL *) 0) { |
| 648 | |
| 649 | switch (other_gs_p->beamloc) { |
| 650 | |
| 651 | case INITEM: |
| 652 | other_gs_p->beamloc = STARTITEM; |
| 653 | break; |
| 654 | |
| 655 | case ENDITEM: |
| 656 | other_gs_p->beamloc = NOITEM; |
| 657 | break; |
| 658 | |
| 659 | default: |
| 660 | break; |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /* skip over the second in the pair */ |
| 665 | gs_p = gs_p->next; |
| 666 | } |
| 667 | } |
| 668 | } |
| 669 | \f |
| 670 | |
| 671 | /* Given a list of GRPSYLs on a visible voice |
| 672 | * having "bm with staff below" do all the error checking. |
| 673 | * This list of groups has to be for the bottom visible voice |
| 674 | * for the duration of the beam. |
| 675 | * There has to be a set of groups on the top non-space visible |
| 676 | * voice of the first visible staff below, |
| 677 | * which starts a "bm with staff above" at exactly |
| 678 | * the same time value. The ebm values also have to match. At every |
| 679 | * point inside the beam, one voice must have notes and the other voice |
| 680 | * must have spaces. |
| 681 | * |
| 682 | * Have to be careful in this function, |
| 683 | * because the gs_p->staffno and gs_p->vno may not be filled in yet, |
| 684 | * so have to use the staffno from the STAFF struct, and get vno from the |
| 685 | * first gs_p, which the caller is supposed to have filled in correctly. |
| 686 | * |
| 687 | * Returns the staff number of the staff containing the matching |
| 688 | * "bm with staff above" or -1 if no such staff was found. |
| 689 | */ |
| 690 | |
| 691 | int |
| 692 | chk_crossbeam(gs_p, mll_p) |
| 693 | |
| 694 | struct GRPSYL *gs_p; /* first group in above voice of cross staff beam */ |
| 695 | struct MAINLL *mll_p; /* gs_p hangs off of here */ |
| 696 | |
| 697 | { |
| 698 | struct GRPSYL *g_p; /* for walking through group list */ |
| 699 | struct GRPSYL *other_p; /* group on other staff */ |
| 700 | struct MAINLL *assoc_mll_p; /* other staff hangs off of here */ |
| 701 | struct GRPSYL *assoc_grps_p; /* the measure-worth of groups in |
| 702 | * the voice being beamed to */ |
| 703 | RATIONAL start_time, end_time; /* of the above voice */ |
| 704 | RATIONAL other_start, other_end;/* time of groups on below staff */ |
| 705 | int user_specified_stem_len; /* YES or NO */ |
| 706 | int size = GS_NORMAL; |
| 707 | int assoc_vno; /* voice number on below staff */ |
| 708 | struct STAFF *staff_p; |
| 709 | int staffno; |
| 710 | int vno; |
| 711 | |
| 712 | |
| 713 | /* only the first gs_p is guaranteed to have the right vno at this |
| 714 | * point, so save that. */ |
| 715 | vno = gs_p->vno; |
| 716 | staff_p = mll_p->u.staff_p; |
| 717 | staffno = staff_p->staffno; |
| 718 | |
| 719 | /* find where in the measure the beam begins, by adding up the |
| 720 | * time values of all the groups prior to the first beamed group */ |
| 721 | for (start_time = Zero, g_p = gs_p->prev; g_p != (struct GRPSYL *) 0; |
| 722 | g_p = g_p->prev) { |
| 723 | start_time = radd(start_time, g_p->fulltime); |
| 724 | } |
| 725 | |
| 726 | /* find how long the beam lasts. Also see if there are any small |
| 727 | * groups */ |
| 728 | for (end_time = start_time, g_p = gs_p; g_p != (struct GRPSYL *) 0; |
| 729 | g_p = g_p->next) { |
| 730 | /* accumulate the time */ |
| 731 | end_time = radd(end_time, g_p->fulltime); |
| 732 | |
| 733 | /* check for small groups */ |
| 734 | if (g_p->grpcont == GC_NOTES && g_p->grpsize == GS_SMALL |
| 735 | && g_p->grpvalue != GV_ZERO) { |
| 736 | size= GS_SMALL; |
| 737 | } |
| 738 | |
| 739 | /* end of the beam? */ |
| 740 | if (g_p->beamloc == ENDITEM && g_p->grpvalue != GV_ZERO) { |
| 741 | break; |
| 742 | } |
| 743 | } |
| 744 | if (g_p == (struct GRPSYL *) 0) { |
| 745 | /* maybe this should be silent, since another error message |
| 746 | * should already be printed, but this will point out that |
| 747 | * the problem was on a cross-staff beam */ |
| 748 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 749 | "can't find end of cross-staff beam"); |
| 750 | return(-1); |
| 751 | } |
| 752 | |
| 753 | /* Make sure this is the bottom voice of the above staff. |
| 754 | * If it's voice 2 (subscript 1) then it is for sure. |
| 755 | * Otherwise, have to make sure the second and third voices, if any, |
| 756 | * have all spaces for the duration of the cross-staff beam */ |
| 757 | if (vno != 1) { |
| 758 | /* If voice 2 is visible and not all spaces, |
| 759 | * or if we are working on voice 1 while voice 3 is |
| 760 | * visible and not all space, there is a problem. */ |
| 761 | if (vvpath(staffno, 2, VISIBLE)->visible == YES && |
| 762 | hasspace(staff_p->groups_p[1], start_time, |
| 763 | end_time) == NO || (vno == 0 && |
| 764 | vvpath(staffno, 3, VISIBLE)->visible == YES && |
| 765 | hasspace(mll_p->u.staff_p->groups_p[2], |
| 766 | start_time, end_time) == NO)) { |
| 767 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 768 | "cross-staff beam must be from bottom voice of staff %d", |
| 769 | mll_p->u.staff_p->staffno); |
| 770 | return(-1); |
| 771 | } |
| 772 | } |
| 773 | |
| 774 | /* Find the associated voice, and the associated bm group |
| 775 | * in that voice. First find the next visible staff */ |
| 776 | for (assoc_mll_p = mll_p->next; ; assoc_mll_p = assoc_mll_p->next) { |
| 777 | if (assoc_mll_p == (struct MAINLL *) 0 || |
| 778 | assoc_mll_p->str != S_STAFF) { |
| 779 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 780 | "no visible staff below to beam with"); |
| 781 | return(-1); |
| 782 | } |
| 783 | |
| 784 | if (svpath(assoc_mll_p->u.staff_p->staffno, VISIBLE)->visible |
| 785 | == YES) { |
| 786 | /* found the right staff */ |
| 787 | break; |
| 788 | } |
| 789 | } |
| 790 | |
| 791 | /* Associated voice is probably voice 1 of the below staff. |
| 792 | * But there is a slight possibility it is voice 2, or even voice 3. |
| 793 | * Skip over voices that are all spaces for the duration of the beam. |
| 794 | * Since voice 3 is the "middle" voice, we check 1, then 3, then 2. |
| 795 | */ |
| 796 | if (vvpath(staffno, 1, VISIBLE)->visible == YES && |
| 797 | hasspace(assoc_mll_p->u.staff_p->groups_p[0], |
| 798 | start_time, end_time) == NO) { |
| 799 | assoc_grps_p = assoc_mll_p->u.staff_p->groups_p[0]; |
| 800 | assoc_vno = 0; |
| 801 | } |
| 802 | else if (vvpath(staffno, 3, VISIBLE)->visible == YES && |
| 803 | hasspace(assoc_mll_p->u.staff_p->groups_p[2], |
| 804 | start_time, end_time) == NO) { |
| 805 | assoc_grps_p = assoc_mll_p->u.staff_p->groups_p[2]; |
| 806 | assoc_vno = 2; |
| 807 | } |
| 808 | else if (vvpath(staffno, 2, VISIBLE)->visible == YES && |
| 809 | hasspace(assoc_mll_p->u.staff_p->groups_p[1], |
| 810 | start_time, end_time) == NO) { |
| 811 | assoc_grps_p = assoc_mll_p->u.staff_p->groups_p[1]; |
| 812 | assoc_vno = 1; |
| 813 | } |
| 814 | else { |
| 815 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 816 | "cross-staff beam has no notes on staff %d", |
| 817 | assoc_mll_p->u.staff_p->staffno); |
| 818 | return(-1); |
| 819 | } |
| 820 | |
| 821 | /* Tab staffs can't be involved in cross-staff beaming */ |
| 822 | if (is_tab_staff(mll_p->u.staff_p->staffno) || |
| 823 | is_tab_staff(assoc_mll_p->u.staff_p->staffno)) { |
| 824 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 825 | "cross-staff beaming not allowed on tab staff"); |
| 826 | return(-1); |
| 827 | } |
| 828 | |
| 829 | /* We don't allow the different staffs to have different staffscale |
| 830 | * values: it doesn't really make much sense to allow it, and avoids |
| 831 | * all the issues like how wide to make the beams. |
| 832 | */ |
| 833 | if (svpath(mll_p->u.staff_p->staffno, STAFFSCALE)->staffscale != |
| 834 | svpath(assoc_mll_p->u.staff_p->staffno, |
| 835 | STAFFSCALE)->staffscale) { |
| 836 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 837 | "staffs involved with cross-staff beams must have identical staffscale values"); |
| 838 | /* We did find which to associate with, even though |
| 839 | * its staffscale was wrong. */ |
| 840 | return(assoc_mll_p->u.staff_p->staffno); |
| 841 | } |
| 842 | |
| 843 | /* find the group that ought to be the "bm with staff above" group, by |
| 844 | * going that far time-wise into the measure on the associated voice */ |
| 845 | for (other_start = Zero, other_p = assoc_grps_p; |
| 846 | other_p != (struct GRPSYL *) 0; |
| 847 | other_p = other_p->next) { |
| 848 | |
| 849 | if (GT(other_start, start_time)) { |
| 850 | /* too far. pretend to be at end of list so we |
| 851 | * and fall out of loop to print the error message |
| 852 | * for this case */ |
| 853 | other_p = (struct GRPSYL *) 0; |
| 854 | break; |
| 855 | } |
| 856 | |
| 857 | if (EQ(other_start, start_time)) { |
| 858 | /* found it! */ |
| 859 | break; |
| 860 | } |
| 861 | |
| 862 | if (other_p->grpvalue == GV_ZERO) { |
| 863 | continue; |
| 864 | } |
| 865 | |
| 866 | /* have to keep going. Keep track of how far we are in time */ |
| 867 | other_start = radd(other_start, other_p->fulltime); |
| 868 | } |
| 869 | |
| 870 | /* skip past any grace groups */ |
| 871 | while (other_p != 0 && other_p->grpvalue == GV_ZERO) { |
| 872 | other_p = other_p->next; |
| 873 | } |
| 874 | |
| 875 | /* If we didn't find a voice below, or that voice's group |
| 876 | * isn't the start of a beam with above, there is a problem. |
| 877 | * In the second case, maybe user really meant to beam with some |
| 878 | * lower voice, but that would collide, which we don't allow. |
| 879 | */ |
| 880 | if (other_p == (struct GRPSYL *) 0 || other_p->beamloc != STARTITEM |
| 881 | || other_p->beamto != CS_ABOVE) { |
| 882 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 883 | "'bm with staff below' has no matching 'bm with staff above' (may be missing, invisible, or on wrong voice)"); |
| 884 | return(assoc_mll_p->u.staff_p->staffno); |
| 885 | } |
| 886 | |
| 887 | /* check if user specified a stem length on the first group */ |
| 888 | if (IS_STEMLEN_KNOWN(gs_p->stemlen) |
| 889 | || IS_STEMLEN_KNOWN(other_p->stemlen)) { |
| 890 | user_specified_stem_len = YES; |
| 891 | } |
| 892 | else { |
| 893 | user_specified_stem_len = NO; |
| 894 | } |
| 895 | |
| 896 | /* go through the two voices. For each note group, verify that |
| 897 | * the other voice has space during that time period. Do the "other" |
| 898 | * staff first, because in a previous version of this function it |
| 899 | * had to be done in that order to avoid possible null pointer |
| 900 | * dereference. Now things have changed, so that doesn't matter |
| 901 | * any more, but I don't want to change the order, to make sure I |
| 902 | * don't break something. |
| 903 | */ |
| 904 | other_p = verify_crossbeam(other_p, |
| 905 | mll_p->u.staff_p->groups_p[vno], start_time, |
| 906 | &other_end, assoc_mll_p->u.staff_p->staffno, size); |
| 907 | gs_p = verify_crossbeam(gs_p, assoc_grps_p, start_time, &end_time, |
| 908 | mll_p->u.staff_p->staffno, size); |
| 909 | |
| 910 | /* we should be pointing to the ebm group for each staff, |
| 911 | * unless of course, something went wrong, like user didn't |
| 912 | * specify an ebm */ |
| 913 | if (gs_p == (struct GRPSYL *) 0 || other_p == (struct GRPSYL *) 0) { |
| 914 | /* maybe this should be silent, since another error message |
| 915 | * should already be printed, but this will point out that |
| 916 | * the problem was on a cross-staff beam */ |
| 917 | l_yyerror(assoc_grps_p->inputfile, assoc_grps_p->inputlineno, |
| 918 | "failed to find ebm for cross-staff beam"); |
| 919 | return(assoc_mll_p->u.staff_p->staffno); |
| 920 | } |
| 921 | |
| 922 | if (NE(end_time, other_end)) { |
| 923 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 924 | "ebm not at same time in measure for both voices of cross-staff beam"); |
| 925 | } |
| 926 | |
| 927 | /* Disallow illegal combinations of slope and stem length */ |
| 928 | slopelencheck(gs_p, other_p, "beam"); |
| 929 | |
| 930 | return(assoc_mll_p->u.staff_p->staffno); |
| 931 | } |
| 932 | \f |
| 933 | |
| 934 | /* Given the first group of a cross-staff beam, and the beginning of the |
| 935 | * list of GRPSYLs in the associated voice (the voice beamed to), and the |
| 936 | * time into the measure where the beam starts, check each group. Verify |
| 937 | * that each GC_NOTES group has GC_SPACE in the other voice and vice-versa. |
| 938 | * Also check that all note groups are the same size, and mark the spaces |
| 939 | * as the correct size so that everything in the beam has the same size. |
| 940 | * Return a pointer to the last group in the beam (null if something goes |
| 941 | * wrong). Also, return the time into the measure of the end of the beam, |
| 942 | * via the end_time_p pointer. |
| 943 | */ |
| 944 | |
| 945 | static struct GRPSYL * |
| 946 | verify_crossbeam(gs_p, other_gs_p, start_time, end_time_p, staffno, size) |
| 947 | |
| 948 | struct GRPSYL *gs_p; /* first group in list to be checked */ |
| 949 | struct GRPSYL *other_gs_p; /* the groups_p of the associated voice */ |
| 950 | RATIONAL start_time; /* when the beam begins */ |
| 951 | RATIONAL *end_time_p; /* time through end of beam will be returned here */ |
| 952 | int staffno; |
| 953 | int size; /* GS_NORMAL or GS_SMALL */ |
| 954 | |
| 955 | { |
| 956 | RATIONAL end_time; |
| 957 | int has_at_least_1_note_group = NO; |
| 958 | |
| 959 | |
| 960 | /* go through each group in the beam */ |
| 961 | for ( ; gs_p != (struct GRPSYL *) 0; gs_p = gs_p->next) { |
| 962 | |
| 963 | /* skip over any grace groups */ |
| 964 | if (gs_p->grpvalue == GV_ZERO) { |
| 965 | continue; |
| 966 | } |
| 967 | |
| 968 | /* find the end time of the group, for passing to hasspace() */ |
| 969 | end_time = radd(start_time, gs_p->fulltime); |
| 970 | |
| 971 | /* if notes, other voice must have space */ |
| 972 | if (gs_p->grpcont == GC_NOTES) { |
| 973 | if (hasspace(other_gs_p, start_time, end_time) == NO) { |
| 974 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 975 | "cross-staff beam must always have notes in one voice and space in the other voice"); |
| 976 | return (struct GRPSYL *) 0; |
| 977 | } |
| 978 | has_at_least_1_note_group = YES; |
| 979 | if (gs_p->grpsize != size) { |
| 980 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 981 | "can't mix normal and cue size chords in cross-staff beam"); |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | /* conversely, if space, other voice must not have space */ |
| 986 | else if (gs_p->grpcont == GC_SPACE) { |
| 987 | struct GRPSYL *g_p; |
| 988 | RATIONAL t; |
| 989 | int oldcont = GC_SPACE; |
| 990 | |
| 991 | /* This is somewhat like hasspace() except that checks |
| 992 | * that the entire duration is space. Here we need |
| 993 | * to check if there is space at least somewhere during |
| 994 | * the time period. If so, user error. |
| 995 | */ |
| 996 | for (g_p = other_gs_p, t = Zero; LT(t, start_time); |
| 997 | g_p = g_p->next) { |
| 998 | if (g_p->grpvalue == GV_ZERO) { |
| 999 | continue; |
| 1000 | } |
| 1001 | t = radd(t, g_p->fulltime); |
| 1002 | oldcont = g_p->grpcont; |
| 1003 | } |
| 1004 | if (GT(t, start_time) && oldcont == GC_SPACE) { |
| 1005 | /* group spilling into this time is space */ |
| 1006 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 1007 | "cross-staff beam must always have notes in one voice and space in the other voice"); |
| 1008 | return (struct GRPSYL *) 0; |
| 1009 | } |
| 1010 | for ( ; g_p != 0 && LT(t, end_time); g_p = g_p->next) { |
| 1011 | if (g_p->grpvalue == GV_ZERO) { |
| 1012 | continue; |
| 1013 | } |
| 1014 | if (g_p->grpcont == GC_SPACE) { |
| 1015 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 1016 | "cross-staff beam must always have notes in one voice and space in the other voice"); |
| 1017 | return (struct GRPSYL *) 0; |
| 1018 | } |
| 1019 | t = radd(t, g_p->fulltime); |
| 1020 | } |
| 1021 | |
| 1022 | /* mark size of spaces. Normally space can't be cue * size, but in this case, it makes it easier for later |
| 1023 | * code (in print phrase at least) if everything in the |
| 1024 | * beam--even spaces--is marked as cue size */ |
| 1025 | gs_p->grpsize = size; |
| 1026 | } |
| 1027 | |
| 1028 | /* esbm is not currently allowed on cross-staff beams. |
| 1029 | * It would much more complicated than normal beams, |
| 1030 | * because the "primary" beam might perhaps best be the top, |
| 1031 | * the bottom, or the middle, depending on where the notes are. |
| 1032 | * Placement and print phase would have to know about that, |
| 1033 | * so that stems could be adjusted properly, |
| 1034 | * and beams drawn in the right places. |
| 1035 | */ |
| 1036 | if (gs_p->breakbeam == YES) { |
| 1037 | l_warning(gs_p->inputfile, gs_p->inputlineno, |
| 1038 | "esbm is not supported on cross-staff beams; being ignored"); |
| 1039 | gs_p->breakbeam = NO; |
| 1040 | } |
| 1041 | |
| 1042 | /* see if we reached the end of the beam */ |
| 1043 | if (gs_p->beamloc == ENDITEM) { |
| 1044 | *end_time_p = end_time; |
| 1045 | if (has_at_least_1_note_group == NO) { |
| 1046 | l_yyerror(gs_p->inputfile, gs_p->inputlineno, |
| 1047 | "cross-staff beam has no notes on staff %d", |
| 1048 | staffno); |
| 1049 | } |
| 1050 | |
| 1051 | return(gs_p); |
| 1052 | } |
| 1053 | |
| 1054 | /* arrange for next time through the loop, by moving the |
| 1055 | * start_time to the next group */ |
| 1056 | start_time = end_time; |
| 1057 | } |
| 1058 | |
| 1059 | /* failed to find an ebm */ |
| 1060 | return (struct GRPSYL *) 0; |
| 1061 | } |
| 1062 | \f |
| 1063 | |
| 1064 | /* User is not allowed to specify length on both ends of a beam along with |
| 1065 | * a slope, because they could becontradictory. */ |
| 1066 | |
| 1067 | static void |
| 1068 | slopelencheck(first_p, last_p, bmtype) |
| 1069 | |
| 1070 | struct GRPSYL *first_p; /* first beamed group */ |
| 1071 | struct GRPSYL *last_p; /* last beamed group */ |
| 1072 | char *bmtype; /* "beam" or "alt" */ |
| 1073 | |
| 1074 | { |
| 1075 | if (IS_STEMLEN_KNOWN(first_p->stemlen) == YES && |
| 1076 | IS_STEMLEN_KNOWN(last_p->stemlen) == YES && |
| 1077 | fabs(first_p->beamslope - NOBEAMANGLE) > 0.001) { |
| 1078 | l_yyerror(last_p->inputfile, last_p->inputlineno, |
| 1079 | "can't specify both end stem lengths and slope for %s", |
| 1080 | bmtype); |
| 1081 | } |
| 1082 | } |