lily/grob-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2011 Jan Nieuwenhuizen <janneke@gnu.org>
   5   Han-Wen Nienhuys <hanwen@xs4all.nl>
   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 "warn.hh"              // error ()
  22 #include "item.hh"
  23 #include "output-def.hh"
  24 #include "system.hh"
  25 #include "font-interface.hh"
  26 #include "paper-score.hh"
  27 #include "grob-array.hh"
  28
  29 LY_DEFINE (ly_grob_property_data, "ly:grob-property-data",
  30            2, 0, 0, (SCM grob, SCM sym),
  31            "Return the value for property @var{sym} of @var{grob},"
  32            " but do not process callbacks.")
  33 {
  34   Grob *sc = unsmob_grob (grob);
  35
  36   LY_ASSERT_SMOB (Grob, grob, 1);
  37   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  38
  39   return sc->get_property_data (sym);
  40 }
  41
  42 LY_DEFINE (ly_grob_set_property_x, "ly:grob-set-property!",
  43            3, 0, 0, (SCM grob, SCM sym, SCM val),
  44            "Set @var{sym} in grob @var{grob} to value @var{val}.")
  45 {
  46   Grob *sc = unsmob_grob (grob);
  47
  48   LY_ASSERT_SMOB (Grob, grob, 1);
  49   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  50
  51   if (!ly_is_procedure (val)
  52       && !type_check_assignment (sym, val, ly_symbol2scm ("backend-type?")))
  53     error ("typecheck failed");
  54
  55   sc->set_property (sym, val);
  56   return SCM_UNSPECIFIED;
  57 }
  58
  59 LY_DEFINE (ly_grob_set_nested_property_x, "ly:grob-set-nested-property!",
  60            3, 0, 0, (SCM grob, SCM symlist, SCM val),
  61            "Set nested property @var{symlist} in grob @var{grob} to value @var{val}.")
  62 {
  63   Grob *sc = unsmob_grob (grob);
  64
  65   LY_ASSERT_SMOB (Grob, grob, 1);
  66
  67   bool type_ok = ly_cheap_is_list (symlist);
  68
  69   if (type_ok)
  70     for (SCM s = symlist; scm_is_pair (s) && type_ok; s = scm_cdr (s))
  71       type_ok &= ly_is_symbol (scm_car (s));
  72
  73   SCM_ASSERT_TYPE (type_ok, symlist, SCM_ARG2, __FUNCTION__, "list of symbols");
  74
  75   set_nested_property (sc, symlist, val);
  76   return SCM_UNSPECIFIED;
  77 }
  78
  79
  80 LY_DEFINE (ly_grob_property, "ly:grob-property",
  81            2, 1, 0, (SCM grob, SCM sym, SCM val),
  82            "Return the value for property @var{sym} of @var{grob}."
  83            "  If no value is found, return @var{val} or @code{'()}"
  84            " if @var{val} is not specified.")
  85 {
  86   Grob *sc = unsmob_grob (grob);
  87
  88   LY_ASSERT_SMOB (Grob, grob, 1);
  89   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  90   if (val == SCM_UNDEFINED)
  91     val = SCM_EOL;
  92
  93   SCM retval = sc->internal_get_property (sym);
  94   if (retval == SCM_EOL)
  95     retval = val;
  96
  97   return retval;
  98 }
  99
 100
 101 LY_DEFINE (ly_grob_interfaces, "ly:grob-interfaces",
 102            1, 0, 0, (SCM grob),
 103            "Return the interfaces list of grob @var{grob}.")
 104 {
 105   Grob *sc = unsmob_grob (grob);
 106
 107   LY_ASSERT_SMOB (Grob, grob, 1);
 108
 109   return sc->interfaces ();
 110 }
 111
 112 LY_DEFINE (ly_grob_object, "ly:grob-object",
 113            2, 0, 0, (SCM grob, SCM sym),
 114            "Return the value of a pointer in grob @var{grob} of property"
 115            " @var{sym}.  It returns @code{'()} (end-of-list) if @var{sym}"
 116            " is undefined in @var{grob}.")
 117 {
 118   Grob *sc = unsmob_grob (grob);
 119
 120   LY_ASSERT_SMOB (Grob, grob, 1);
 121   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
 122
 123   return sc->internal_get_object (sym);
 124 }
 125
 126
 127 LY_DEFINE (ly_grob_set_object_x, "ly:grob-set-object!",
 128            3, 0, 0, (SCM grob, SCM sym, SCM val),
 129            "Set @var{sym} in grob @var{grob} to value @var{val}.")
 130 {
 131   Grob *sc = unsmob_grob (grob);
 132
 133   LY_ASSERT_SMOB (Grob, grob, 1);
 134   LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
 135
 136   sc->set_object (sym, val);
 137   return SCM_UNSPECIFIED;
 138 }
 139
 140 /* TODO: make difference between scaled and unscalead variable in
 141    calling (i.e different funcs.) */
 142 LY_DEFINE (ly_grob_layout, "ly:grob-layout",
 143            1, 0, 0, (SCM grob),
 144            "Get @code{\\layout} definition from grob @var{grob}.")
 145 {
 146   Grob *sc = unsmob_grob (grob);
 147
 148   LY_ASSERT_SMOB (Grob, grob, 1);
 149
 150   return sc->layout ()->self_scm ();
 151 }
 152
 153 LY_DEFINE (ly_grob_alist_chain, "ly:grob-alist-chain",
 154            1, 1, 0, (SCM grob, SCM global),
 155            "Get an alist chain for grob @var{grob}, with @var{global} as"
 156            " the global default.  If unspecified, @code{font-defaults}"
 157            " from the layout block is taken.")
 158 {
 159   Grob *sc = unsmob_grob (grob);
 160
 161   LY_ASSERT_SMOB (Grob, grob, 1);
 162
 163   if (global == SCM_UNDEFINED)
 164     {
 165       global = sc->layout ()->lookup_variable (ly_symbol2scm ("font-defaults"));
 166       if (global == SCM_UNDEFINED)
 167         global = SCM_EOL;
 168     }
 169
 170   return sc->get_property_alist_chain (global);
 171 }
 172
 173 LY_DEFINE (ly_grob_extent, "ly:grob-extent",
 174            3, 0, 0, (SCM grob, SCM refp, SCM axis),
 175            "Get the extent in @var{axis} direction of @var{grob} relative to"
 176            " the grob @var{refp}.")
 177 {
 178   Grob *sc = unsmob_grob (grob);
 179   Grob *ref = unsmob_grob (refp);
 180
 181
 182   LY_ASSERT_SMOB (Grob, grob, 1);
 183   LY_ASSERT_SMOB (Grob, refp, 2);
 184   LY_ASSERT_TYPE (is_axis, axis, 3);
 185
 186   Axis a = Axis (scm_to_int (axis));
 187
 188
 189   if (ref->common_refpoint (sc, a) != ref)
 190     {
 191       // ugh. should use other error message
 192       SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
 193     }
 194   return ly_interval2scm (sc->extent (ref, a));
 195 }
 196
 197 LY_DEFINE (ly_grob_robust_relative_extent, "ly:grob-robust-relative-extent",
 198            3, 0, 0, (SCM grob, SCM refp, SCM axis),
 199            "Get the extent in @var{axis} direction of @var{grob} relative to"
 200            " the grob @var{refp}, or @code{(0,0)} if empty.")
 201 {
 202   Grob *sc = unsmob_grob (grob);
 203   Grob *ref = unsmob_grob (refp);
 204
 205
 206   LY_ASSERT_SMOB (Grob, grob, 1);
 207   LY_ASSERT_SMOB (Grob, refp, 2);
 208   LY_ASSERT_TYPE (is_axis, axis, 3);
 209
 210   Axis a = Axis (scm_to_int (axis));
 211
 212   if (ref->common_refpoint (sc, a) != ref)
 213     {
 214       // ugh. should use other error message
 215       SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
 216     }
 217
 218   return ly_interval2scm (robust_relative_extent (sc, ref, a));
 219 }
 220
 221 LY_DEFINE (ly_grob_relative_coordinate, "ly:grob-relative-coordinate",
 222            3, 0, 0, (SCM grob, SCM refp, SCM axis),
 223            "Get the coordinate in @var{axis} direction of @var{grob} relative"
 224            " to the grob @var{refp}.")
 225 {
 226   Grob *sc = unsmob_grob (grob);
 227   Grob *ref = unsmob_grob (refp);
 228
 229
 230   LY_ASSERT_SMOB (Grob, grob, 1);
 231   LY_ASSERT_SMOB (Grob, refp, 2);
 232   LY_ASSERT_TYPE (is_axis, axis, 3);
 233
 234   Axis a = Axis (scm_to_int (axis));
 235
 236
 237   if (ref->common_refpoint (sc, a) != ref)
 238     {
 239       // ugh. should use other error message
 240       SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
 241     }
 242
 243   return scm_from_double (sc->relative_coordinate (ref, a));
 244 }
 245
 246
 247 LY_DEFINE (ly_grob_parent, "ly:grob-parent",
 248            2, 0, 0, (SCM grob, SCM axis),
 249            "Get the parent of @var{grob}.  @var{axis} is 0 for the X-axis,"
 250            " 1@tie{}for the Y-axis.")
 251 {
 252   Grob *sc = unsmob_grob (grob);
 253
 254   LY_ASSERT_SMOB (Grob, grob, 1);
 255   LY_ASSERT_TYPE (is_axis, axis, 2);
 256
 257   Grob *par = sc->get_parent (Axis (scm_to_int (axis)));
 258   return par ? par->self_scm () : SCM_EOL;
 259 }
 260
 261 LY_DEFINE (ly_grob_set_parent_x, "ly:grob-set-parent!",
 262            3, 0, 0, (SCM grob, SCM axis, SCM parent_grob),
 263            "Set @var{parent-grob} the parent of grob @var{grob} in axis @var{axis}.")
 264 {
 265   Grob *gr = unsmob_grob (grob);
 266   Grob *parent = unsmob_grob (parent_grob);
 267
 268   LY_ASSERT_SMOB (Grob, grob, 1);
 269   LY_ASSERT_TYPE (is_axis, axis, 2);
 270   LY_ASSERT_SMOB (Grob, parent_grob, 3);
 271
 272   Axis a = Axis (scm_to_int (axis));
 273   gr->set_parent (parent, a);
 274   return SCM_UNSPECIFIED;
 275 }
 276
 277 LY_DEFINE (ly_grob_properties, "ly:grob-properties",
 278            1, 0, 0, (SCM grob),
 279            "Get the mutable properties of @var{grob}.")
 280 {
 281   Grob *g = unsmob_grob (grob);
 282
 283   LY_ASSERT_SMOB (Grob, grob, 1);
 284
 285   /* FIXME: uhg? copy/read only? */
 286   return g->mutable_property_alist_;
 287 }
 288
 289 LY_DEFINE (ly_grob_basic_properties, "ly:grob-basic-properties",
 290            1, 0, 0, (SCM grob),
 291            "Get the immutable properties of @var{grob}.")
 292 {
 293   Grob *g = unsmob_grob (grob);
 294
 295   LY_ASSERT_SMOB (Grob, grob, 1);
 296
 297   /* FIXME: uhg? copy/read only? */
 298   return g->immutable_property_alist_;
 299 }
 300
 301 LY_DEFINE (ly_grob_system, "ly:grob-system",
 302            1, 0, 0, (SCM grob),
 303            "Return the system grob of @var{grob}.")
 304 {
 305   Grob *me = unsmob_grob (grob);
 306
 307   LY_ASSERT_SMOB (Grob, grob, 1);
 308
 309   if (System *g = me->get_system ())
 310     return g->self_scm ();
 311
 312   return SCM_EOL;
 313 }
 314
 315 LY_DEFINE (ly_grob_original, "ly:grob-original",
 316            1, 0, 0, (SCM grob),
 317            "Return the unbroken original grob of @var{grob}.")
 318 {
 319   Grob *me = unsmob_grob (grob);
 320
 321   LY_ASSERT_SMOB (Grob, grob, 1);
 322   return me->original () ? me->original ()->self_scm () : me->self_scm ();
 323 }
 324
 325
 326 LY_DEFINE (ly_grob_suicide_x, "ly:grob-suicide!",
 327            1, 0, 0, (SCM grob),
 328            "Kill @var{grob}.")
 329 {
 330   Grob *me = unsmob_grob (grob);
 331
 332   LY_ASSERT_SMOB (Grob, grob, 1);
 333
 334   me->suicide ();
 335   return SCM_UNSPECIFIED;
 336 }
 337
 338 LY_DEFINE (ly_grob_translate_axis_x, "ly:grob-translate-axis!",
 339            3, 0, 0, (SCM grob, SCM d, SCM a),
 340            "Translate @var{grob} on axis@tie{}@var{a} over"
 341            " distance@tie{}@var{d}.")
 342 {
 343   Grob *me = unsmob_grob (grob);
 344
 345   LY_ASSERT_SMOB (Grob, grob, 1);
 346   LY_ASSERT_TYPE (scm_is_number, d, 2);
 347   LY_ASSERT_TYPE (is_axis, a, 3);
 348
 349   me->translate_axis (scm_to_double (d), Axis (scm_to_int (a)));
 350   return SCM_UNSPECIFIED;
 351 }
 352
 353 LY_DEFINE (ly_grob_default_font, "ly:grob-default-font",
 354            1, 0, 0, (SCM grob),
 355            "Return the default font for grob @var{grob}.")
 356 {
 357   Grob *gr = unsmob_grob (grob);
 358
 359   LY_ASSERT_SMOB (Grob, grob, 1);
 360
 361   return Font_interface::get_default_font (gr)->self_scm ();
 362 }
 363
 364
 365 /*
 366   TODO: consider swapping order, so we can do
 367
 368   (grob-common-refpoint a b c d e)
 369  */
 370 LY_DEFINE (ly_grob_common_refpoint, "ly:grob-common-refpoint",
 371            3, 0, 0,  (SCM grob, SCM other, SCM axis),
 372            "Find the common refpoint of @var{grob} and @var{other}"
 373            " for @var{axis}.")
 374 {
 375
 376   Grob *gr = unsmob_grob (grob);
 377
 378   LY_ASSERT_SMOB (Grob, grob, 1);
 379   LY_ASSERT_SMOB (Grob, other, 2);
 380
 381   Grob *o = unsmob_grob (other);
 382
 383   LY_ASSERT_TYPE (is_axis, axis, 3);
 384
 385   Grob *refp = gr->common_refpoint (o,  Axis (scm_to_int (axis)));
 386   return refp ? refp->self_scm () : SCM_BOOL_F;
 387 }
 388
 389 LY_DEFINE (ly_grob_common_refpoint_of_array, "ly:grob-common-refpoint-of-array",
 390            3, 0, 0,  (SCM grob, SCM others, SCM axis),
 391            "Find the common refpoint of @var{grob} and @var{others}"
 392            " (a grob-array) for @var{axis}.")
 393 {
 394   Grob *gr = unsmob_grob (grob);
 395
 396   LY_ASSERT_SMOB (Grob, grob, 1);
 397   LY_ASSERT_SMOB (Grob_array, others, 2);
 398
 399   Grob_array *ga = unsmob_grob_array (others);
 400   LY_ASSERT_TYPE (is_axis, axis, 3);
 401
 402   Grob *refp = common_refpoint_of_array (ga->array (), gr, Axis (scm_to_int (axis)));
 403   return refp ? refp->self_scm () : SCM_BOOL_F;
 404 }
 405
 406 LY_DEFINE (ly_grob_chain_callback, "ly:grob-chain-callback",
 407            3, 0, 0, (SCM grob, SCM proc, SCM sym),
 408            "Find the callback that is stored as property"
 409            " @var{sym} of grob @var{grob} and chain @var{proc}"
 410            " to the head of this, meaning that it is called"
 411            " using @var{grob} and the previous callback's result.")
 412 {
 413   Grob *gr = unsmob_grob (grob);
 414
 415   LY_ASSERT_SMOB (Grob, grob, 1);
 416   LY_ASSERT_TYPE (ly_is_procedure, proc, 2);
 417   LY_ASSERT_TYPE (ly_is_symbol, sym, 3);
 418
 419   chain_callback (gr, proc, sym);
 420   return SCM_UNSPECIFIED;
 421 }