2 Implement storage and manipulation of grob properties.
9 #include "pointer-group-interface.hh"
11 #include "paper-score.hh"
12 #include "output-def.hh"
14 #include "international.hh"
18 #include "program-option.hh"
20 #include "simple-closure.hh"
24 static SCM modification_callback = SCM_EOL;
25 static SCM cache_callback = SCM_EOL;
27 LY_DEFINE (ly_set_grob_modification_callback, "ly:set-grob-modification-callback",
29 "Specify a procedure that will be called every time lilypond modifies "
30 "a grob property. The callback will receive as arguments "
31 "the grob that is being modified, "
32 "the name of the C++ file in which the modification was requested, "
33 "the line number in the C++ file in which the modification was requested, "
34 "the name of the function in which the modification was requested, "
35 "the property to be changed and "
36 "the new value for the property.")
38 LY_ASSERT_TYPE (ly_is_procedure, cb, 1);
40 modification_callback = cb;
41 return SCM_UNSPECIFIED;
44 LY_DEFINE (ly_set_property_cache_callback, "ly:set-property-cache-callback",
46 "Specify a procedure that will be called whenever lilypond calculates "
47 "a callback function and caches the result. The callback will "
48 "receive as arguments "
49 "the grob whose property it is, "
50 "the name of the property, "
51 "the name of the callback that calculated the property and "
52 "the new (cached) value of the property.")
54 LY_ASSERT_TYPE (ly_is_procedure, cb, 1);
57 return SCM_UNSPECIFIED;
61 Grob::instrumented_set_property (SCM sym, SCM v,
66 if (ly_is_procedure (modification_callback))
67 scm_apply_0 (modification_callback,
68 scm_list_n (self_scm (),
69 scm_from_locale_string (file),
71 scm_from_locale_string (fun),
72 sym, v, SCM_UNDEFINED));
73 internal_set_property (sym, v);
78 Grob::get_property_alist_chain (SCM def) const
80 return scm_list_n (mutable_property_alist_,
81 immutable_property_alist_,
87 extern void check_interfaces_for_property (Grob const *me, SCM sym);
90 Grob::internal_set_property (SCM sym, SCM v)
92 internal_set_value_on_alist (&mutable_property_alist_,
98 Grob::internal_set_value_on_alist (SCM *alist, SCM sym, SCM v)
100 /* Perhaps we simply do the assq_set, but what the heck. */
104 if (do_internal_type_checking_global)
106 if (!ly_is_procedure (v)
107 && !is_simple_closure (v)
108 && v != ly_symbol2scm ("calculation-in-progress"))
109 type_check_assignment (sym, v, ly_symbol2scm ("backend-type?"));
111 check_interfaces_for_property (this, sym);
114 *alist = scm_assq_set_x (*alist, sym, v);
118 Grob::internal_get_property_data (SCM sym) const
121 if (profile_property_accesses)
122 note_property_access (&grob_property_lookup_table, sym);
125 SCM handle = scm_sloppy_assq (sym, mutable_property_alist_);
126 if (handle != SCM_BOOL_F)
127 return scm_cdr (handle);
129 handle = scm_sloppy_assq (sym, immutable_property_alist_);
131 if (do_internal_type_checking_global && scm_is_pair (handle))
133 SCM val = scm_cdr (handle);
134 if (!ly_is_procedure (val) && !is_simple_closure (val))
135 type_check_assignment (sym, val, ly_symbol2scm ("backend-type?"));
137 check_interfaces_for_property (this, sym);
140 return (handle == SCM_BOOL_F) ? SCM_EOL : scm_cdr (handle);
144 Grob::internal_get_property (SCM sym) const
146 SCM val = get_property_data (sym);
149 if (val == ly_symbol2scm ("calculation-in-progress"))
150 programming_error (_f ("cyclic dependency: calculation-in-progress encountered for #'%s (%s)",
151 ly_symbol2string (sym).c_str (),
155 if (ly_is_procedure (val)
156 || is_simple_closure (val))
158 Grob *me = ((Grob*)this);
159 val = me->try_callback_on_alist (&me->mutable_property_alist_, sym, val);
166 #include "protected-scm.hh"
168 Protected_scm grob_property_callback_stack = SCM_EOL;
169 bool debug_property_callbacks = 0;
173 Grob::try_callback_on_alist (SCM *alist, SCM sym, SCM proc)
175 SCM marker = ly_symbol2scm ("calculation-in-progress");
177 need to put a value in SYM to ensure that we don't get a
180 *alist = scm_assq_set_x (*alist, sym, marker);
183 if (debug_property_callbacks)
184 grob_property_callback_stack = scm_acons (sym, proc, grob_property_callback_stack);
188 if (ly_is_procedure (proc))
189 value = scm_call_1 (proc, self_scm ());
190 else if (is_simple_closure (proc))
192 value = evaluate_with_simple_closure (self_scm (),
193 simple_closure_expression (proc),
198 if (debug_property_callbacks)
199 grob_property_callback_stack = scm_cdr (grob_property_callback_stack);
203 If the function returns SCM_UNSPECIFIED, we assume the
204 property has been set with an explicit set_property ()
207 if (value == SCM_UNSPECIFIED)
209 value = get_property_data (sym);
210 assert (value == SCM_EOL || value == marker);
212 *alist = scm_assq_remove_x (*alist, marker);
217 if (ly_is_procedure (cache_callback))
218 scm_apply_0 (cache_callback,
219 scm_list_n (self_scm (),
225 internal_set_value_on_alist (alist, sym, value);
232 Grob::internal_set_object (SCM s, SCM v)
234 /* Perhaps we simply do the assq_set, but what the heck. */
238 object_alist_ = scm_assq_set_x (object_alist_, s, v);
242 Grob::internal_del_property (SCM sym)
244 mutable_property_alist_ = scm_assq_remove_x (mutable_property_alist_, sym);
248 Grob::internal_get_object (SCM sym) const
250 if (profile_property_accesses)
251 note_property_access (&grob_property_lookup_table, sym);
253 SCM s = scm_sloppy_assq (sym, object_alist_);
257 SCM val = scm_cdr (s);
258 if (ly_is_procedure (val)
259 || is_simple_closure (val))
261 Grob *me = ((Grob*)this);
262 val = me->try_callback_on_alist (&me->object_alist_, sym, val);
272 Grob::is_live () const
274 return scm_is_pair (immutable_property_alist_);
278 Grob::internal_has_interface (SCM k)
280 return scm_c_memq (k, interfaces_) != SCM_BOOL_F;
284 call_pure_function (SCM unpure, SCM args, int start, int end)
286 SCM scm_call_pure_function = ly_lily_module_constant ("call-pure-function");
288 return scm_apply_0 (scm_call_pure_function,
289 scm_list_4 (unpure, args, scm_from_int (start), scm_from_int (end)));
294 PROP_PATH should be big-to-small ordering
297 nested_property_alist (SCM alist, SCM prop_path, SCM value)
299 SCM new_value = SCM_BOOL_F;
300 if (scm_is_pair (scm_cdr (prop_path)))
302 SCM sub_alist = ly_assoc_get (scm_car (prop_path), alist, SCM_EOL);
303 new_value = nested_property_alist (sub_alist, scm_cdr (prop_path), value);
310 return scm_acons (scm_car (prop_path), new_value, alist);
315 set_nested_property (Grob *me, SCM property_path, SCM value)
317 SCM big_to_small = scm_reverse (property_path);
318 SCM alist = me->get_property (scm_car (big_to_small));
320 alist = nested_property_alist (alist, scm_cdr (big_to_small), value);
322 me->set_property (scm_car (big_to_small),