2 grob-scheme.cc -- Scheme entry points for the grob datatype
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2007 Jan Nieuwenhuizen <janneke@gnu.org>
7 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "warn.hh" // error ()
12 #include "output-def.hh"
14 #include "font-interface.hh"
15 #include "paper-score.hh"
16 #include "grob-array.hh"
18 LY_DEFINE (ly_grob_property_data, "ly:grob-property-data",
19 2, 0, 0, (SCM grob, SCM sym),
20 "Retrieve @var{sym} for @var{grob} but don't process callbacks.")
22 Grob *sc = unsmob_grob (grob);
24 LY_ASSERT_SMOB (Grob, grob, 1);
25 LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
27 return sc->get_property_data (sym);
30 LY_DEFINE (ly_grob_set_property_x, "ly:grob-set-property!",
31 3, 0, 0, (SCM grob, SCM sym, SCM val),
32 "Set @var{sym} in grob @var{grob} to value @var{val}.")
34 Grob *sc = unsmob_grob (grob);
36 LY_ASSERT_SMOB (Grob, grob, 1);
37 LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
39 if (!ly_is_procedure (val)
40 && !type_check_assignment (sym, val, ly_symbol2scm ("backend-type?")))
41 error ("typecheck failed");
43 sc->set_property (sym, val);
44 return SCM_UNSPECIFIED;
47 LY_DEFINE (ly_grob_property, "ly:grob-property",
48 2, 1, 0, (SCM grob, SCM sym, SCM deflt),
49 "Return the value of a value in grob@tie{}@var{g} of property"
50 " @var{sym}. It returns @code{'()} (end-of-list) or"
51 " @var{deflt} (if specified) if @var{sym} is undefined"
54 Grob *sc = unsmob_grob (grob);
56 LY_ASSERT_SMOB (Grob, grob, 1);
57 LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
58 if (deflt == SCM_UNDEFINED)
61 SCM retval = sc->internal_get_property (sym);
62 if (retval == SCM_EOL)
69 LY_DEFINE (ly_grob_interfaces, "ly:grob-interfaces",
71 "Return the interfaces list of grob @var{grob}.")
73 Grob *sc = unsmob_grob (grob);
75 LY_ASSERT_SMOB (Grob, grob, 1);
77 return sc->interfaces ();
80 LY_DEFINE (ly_grob_object, "ly:grob-object",
81 2, 0, 0, (SCM grob, SCM sym),
82 "Return the value of a pointer in grob@tie{}@var{g} of property"
83 " @var{sym}. It returns @code{'()} (end-of-list) if @var{sym}"
84 " is undefined in@tie{}@var{g}.")
86 Grob *sc = unsmob_grob (grob);
88 LY_ASSERT_SMOB (Grob, grob, 1);
89 LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
91 return sc->internal_get_object (sym);
96 /* TODO: make difference between scaled and unscalead variable in
97 calling (i.e different funcs.) */
98 LY_DEFINE (ly_grob_layout, "ly:grob-layout",
100 "Get @code{\\layout} definition from grob @var{grob}.")
102 Grob *sc = unsmob_grob (grob);
104 LY_ASSERT_SMOB (Grob, grob, 1);
106 return sc->layout ()->self_scm ();
109 LY_DEFINE (ly_grob_alist_chain, "ly:grob-alist-chain",
110 1, 1, 0, (SCM grob, SCM global),
111 "Get an alist chain for grob @var{grob}, with @var{global} as"
112 " the global default. If unspecified, @code{font-defaults}"
113 " from the layout block is taken.")
115 Grob *sc = unsmob_grob (grob);
117 LY_ASSERT_SMOB (Grob, grob, 1);
119 if (global == SCM_UNDEFINED)
121 global = sc->layout ()->lookup_variable (ly_symbol2scm ("font-defaults"));
122 if (global == SCM_UNDEFINED)
126 return sc->get_property_alist_chain (global);
129 LY_DEFINE (ly_grob_extent, "ly:grob-extent",
130 3, 0, 0, (SCM grob, SCM refp, SCM axis),
131 "Get the extent in @var{axis} direction of @var{grob} relative to"
132 " the grob @var{refp}.")
134 Grob *sc = unsmob_grob (grob);
135 Grob *ref = unsmob_grob (refp);
138 LY_ASSERT_SMOB (Grob, grob, 1);
139 LY_ASSERT_SMOB (Grob, refp, 2);
140 LY_ASSERT_TYPE (is_axis, axis, 3);
142 Axis a = Axis (scm_to_int (axis));
145 if (ref->common_refpoint (sc, a) != ref)
147 // ugh. should use other error message
148 SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
150 return ly_interval2scm (sc->extent (ref, a));
153 LY_DEFINE (ly_grob_robust_relative_extent, "ly:grob-robust-relative-extent",
154 3, 0, 0, (SCM grob, SCM refp, SCM axis),
155 "Get the extent in @var{axis} direction of @var{grob} relative to"
156 " the grob @var{refp}, or @code{(0,0)} if empty.")
158 Grob *sc = unsmob_grob (grob);
159 Grob *ref = unsmob_grob (refp);
162 LY_ASSERT_SMOB (Grob, grob, 1);
163 LY_ASSERT_SMOB (Grob, refp, 2);
164 LY_ASSERT_TYPE (is_axis, axis, 3);
166 Axis a = Axis (scm_to_int (axis));
168 if (ref->common_refpoint (sc, a) != ref)
170 // ugh. should use other error message
171 SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
174 return ly_interval2scm (robust_relative_extent (sc, ref, a));
177 LY_DEFINE (ly_grob_relative_coordinate, "ly:grob-relative-coordinate",
178 3, 0, 0, (SCM grob, SCM refp, SCM axis),
179 "Get the coordinate in @var{axis} direction of @var{grob} relative"
180 " to the grob @var{refp}.")
182 Grob *sc = unsmob_grob (grob);
183 Grob *ref = unsmob_grob (refp);
186 LY_ASSERT_SMOB (Grob, grob, 1);
187 LY_ASSERT_SMOB (Grob, refp, 2);
188 LY_ASSERT_TYPE (is_axis, axis, 3);
190 Axis a = Axis (scm_to_int (axis));
193 if (ref->common_refpoint (sc, a) != ref)
195 // ugh. should use other error message
196 SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
199 return scm_from_double (sc->relative_coordinate (ref, a));
203 LY_DEFINE (ly_grob_parent, "ly:grob-parent",
204 2, 0, 0, (SCM grob, SCM axis),
205 "Get the parent of @var{grob}. @var{axis} is 0 for the X-axis,"
206 " 1@tie{}for the Y-axis.")
208 Grob *sc = unsmob_grob (grob);
210 LY_ASSERT_SMOB (Grob, grob, 1);
211 LY_ASSERT_TYPE (is_axis, axis, 2);
213 Grob *par = sc->get_parent (Axis (scm_to_int (axis)));
214 return par ? par->self_scm () : SCM_EOL;
217 LY_DEFINE (ly_grob_properties, "ly:grob-properties",
219 "Get the mutable properties of @var{grob}.")
221 Grob *g = unsmob_grob (grob);
223 LY_ASSERT_SMOB (Grob, grob, 1);
225 /* FIXME: uhg? copy/read only? */
226 return g->mutable_property_alist_;
229 LY_DEFINE (ly_grob_basic_properties, "ly:grob-basic-properties",
231 "Get the immutable properties of @var{grob}.")
233 Grob *g = unsmob_grob (grob);
235 LY_ASSERT_SMOB (Grob, grob, 1);
237 /* FIXME: uhg? copy/read only? */
238 return g->immutable_property_alist_;
241 LY_DEFINE (ly_grob_system, "ly:grob-system",
243 "Return the system grob of @var{grob}.")
245 Grob *me = unsmob_grob (grob);
247 LY_ASSERT_SMOB (Grob, grob, 1);
249 if (System *g = me->get_system ())
250 return g->self_scm ();
255 LY_DEFINE (ly_grob_original, "ly:grob-original",
257 "Return the unbroken original grob of @var{grob}.")
259 Grob *me = unsmob_grob (grob);
261 LY_ASSERT_SMOB (Grob, grob, 1);
262 return me->original () ? me->original ()->self_scm () : me->self_scm ();
266 LY_DEFINE (ly_grob_suicide_x, "ly:grob-suicide!",
270 Grob *me = unsmob_grob (grob);
272 LY_ASSERT_SMOB (Grob, grob, 1);
275 return SCM_UNSPECIFIED;
278 LY_DEFINE (ly_grob_translate_axis_x, "ly:grob-translate-axis!",
279 3, 0, 0, (SCM grob, SCM d, SCM a),
280 "Translate @var{g} on axis@tie{}@var{a} over"
281 " distance@tie{}@var{d}.")
283 Grob *me = unsmob_grob (grob);
285 LY_ASSERT_SMOB (Grob, grob, 1);
286 LY_ASSERT_TYPE (scm_is_number, d, 2);
287 LY_ASSERT_TYPE (is_axis, a, 3);
289 me->translate_axis (scm_to_double (d), Axis (scm_to_int (a)));
290 return SCM_UNSPECIFIED;
293 LY_DEFINE (ly_grob_default_font, "ly:grob-default-font",
295 "Return the default font for grob @var{gr}.")
297 Grob *gr = unsmob_grob (grob);
299 LY_ASSERT_SMOB (Grob, grob, 1);
301 return Font_interface::get_default_font (gr)->self_scm ();
306 TODO: consider swapping order, so we can do
308 (grob-common-refpoint a b c d e)
310 LY_DEFINE (ly_grob_common_refpoint, "ly:grob-common-refpoint",
311 3, 0, 0, (SCM grob, SCM other, SCM axis),
312 "Find the common refpoint of @var{grob} and @var{other}"
316 Grob *gr = unsmob_grob (grob);
318 LY_ASSERT_SMOB (Grob, grob, 1);
319 LY_ASSERT_SMOB (Grob, other, 2);
321 Grob *o = unsmob_grob (other);
323 LY_ASSERT_TYPE (is_axis, axis, 3);
325 Grob *refp = gr->common_refpoint (o, Axis (scm_to_int (axis)));
326 return refp ? refp->self_scm () : SCM_BOOL_F;
329 LY_DEFINE (ly_grob_common_refpoint_of_array, "ly:grob-common-refpoint-of-array",
330 3, 0, 0, (SCM grob, SCM others, SCM axis),
331 "Find the common refpoint of @var{grob} and @var{others}"
332 " (a grob-array) for @var{axis}.")
334 Grob *gr = unsmob_grob (grob);
336 LY_ASSERT_SMOB (Grob, grob, 1);
337 LY_ASSERT_SMOB (Grob_array, others, 2);
339 Grob_array *ga = unsmob_grob_array (others);
340 LY_ASSERT_TYPE (is_axis, axis, 3);
342 Grob *refp = common_refpoint_of_array (ga->array (), gr, Axis (scm_to_int (axis)));
343 return refp ? refp->self_scm () : SCM_BOOL_F;