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_,
86 extern void check_interfaces_for_property (Grob const *me, SCM sym);
89 Grob::internal_set_property (SCM sym, SCM v)
91 internal_set_value_on_alist (&mutable_property_alist_,
97 Grob::internal_set_value_on_alist (SCM *alist, SCM sym, SCM v)
99 /* Perhaps we simply do the assq_set, but what the heck. */
103 if (do_internal_type_checking_global)
105 if (!ly_is_procedure (v)
106 && !is_simple_closure (v)
107 && v != ly_symbol2scm ("calculation-in-progress"))
108 type_check_assignment (sym, v, ly_symbol2scm ("backend-type?"));
110 check_interfaces_for_property (this, sym);
113 *alist = scm_assq_set_x (*alist, sym, v);
117 Grob::internal_get_property_data (SCM sym) const
120 if (profile_property_accesses)
121 note_property_access (&grob_property_lookup_table, sym);
124 SCM handle = scm_sloppy_assq (sym, mutable_property_alist_);
125 if (handle != SCM_BOOL_F)
126 return scm_cdr (handle);
128 handle = scm_sloppy_assq (sym, immutable_property_alist_);
130 if (do_internal_type_checking_global && scm_is_pair (handle))
132 SCM val = scm_cdr (handle);
133 if (!ly_is_procedure (val) && !is_simple_closure (val))
134 type_check_assignment (sym, val, ly_symbol2scm ("backend-type?"));
136 check_interfaces_for_property (this, sym);
139 return (handle == SCM_BOOL_F) ? SCM_EOL : scm_cdr (handle);
143 Grob::internal_get_property (SCM sym) const
145 SCM val = get_property_data (sym);
148 if (val == ly_symbol2scm ("calculation-in-progress"))
149 programming_error (_f ("cyclic dependency: calculation-in-progress encountered for #'%s (%s)",
150 ly_symbol2string (sym).c_str (),
154 if (ly_is_procedure (val)
155 || is_simple_closure (val))
157 Grob *me = ((Grob*)this);
158 val = me->try_callback_on_alist (&me->mutable_property_alist_, sym, val);
165 #include "protected-scm.hh"
167 Protected_scm grob_property_callback_stack = SCM_EOL;
168 bool debug_property_callbacks = 0;
172 Grob::try_callback_on_alist (SCM *alist, SCM sym, SCM proc)
174 SCM marker = ly_symbol2scm ("calculation-in-progress");
176 need to put a value in SYM to ensure that we don't get a
179 *alist = scm_assq_set_x (*alist, sym, marker);
182 if (debug_property_callbacks)
183 grob_property_callback_stack = scm_acons (sym, proc, grob_property_callback_stack);
187 if (ly_is_procedure (proc))
188 value = scm_call_1 (proc, self_scm ());
189 else if (is_simple_closure (proc))
191 value = evaluate_with_simple_closure (self_scm (),
192 simple_closure_expression (proc),
197 if (debug_property_callbacks)
198 grob_property_callback_stack = scm_cdr (grob_property_callback_stack);
202 If the function returns SCM_UNSPECIFIED, we assume the
203 property has been set with an explicit set_property ()
206 if (value == SCM_UNSPECIFIED)
208 value = get_property_data (sym);
209 assert (value == SCM_EOL || value == marker);
211 *alist = scm_assq_remove_x (*alist, marker);
216 if (ly_is_procedure (cache_callback))
217 scm_apply_0 (cache_callback,
218 scm_list_n (self_scm (),
224 internal_set_value_on_alist (alist, sym, value);
231 Grob::internal_set_object (SCM s, SCM v)
233 /* Perhaps we simply do the assq_set, but what the heck. */
237 object_alist_ = scm_assq_set_x (object_alist_, s, v);
241 Grob::internal_del_property (SCM sym)
243 mutable_property_alist_ = scm_assq_remove_x (mutable_property_alist_, sym);
247 Grob::internal_get_object (SCM sym) const
249 if (profile_property_accesses)
250 note_property_access (&grob_property_lookup_table, sym);
252 SCM s = scm_sloppy_assq (sym, object_alist_);
256 SCM val = scm_cdr (s);
257 if (ly_is_procedure (val)
258 || is_simple_closure (val))
260 Grob *me = ((Grob*)this);
261 val = me->try_callback_on_alist (&me->object_alist_, sym, val);
271 Grob::is_live () const
273 return scm_is_pair (immutable_property_alist_);
277 Grob::internal_has_interface (SCM k)
279 return scm_c_memq (k, interfaces_) != SCM_BOOL_F;
283 call_pure_function (SCM unpure, SCM args, int start, int end)
285 SCM scm_call_pure_function = ly_lily_module_constant ("call-pure-function");
287 return scm_apply_0 (scm_call_pure_function,
288 scm_list_4 (unpure, args, scm_from_int (start), scm_from_int (end)));