2 ly-module.cc -- implement guile module stuff.
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "lily-guile.hh"
13 #include "protected-scm.hh"
15 #define MODULE_GC_KLUDGE
17 #define FUNC_NAME __FUNCTION__
19 Protected_scm anonymous_modules = SCM_EOL;
21 LY_DEFINE(ly_clear_anonymous_modules, "ly:clear-anonymous-modules",
23 "Plug a GUILE 1.6 and 1.7 memory leak by breaking a weak reference "
24 "pointer cycle explicitly."
27 #ifdef MODULE_GC_KLUDGE
28 for (SCM s = anonymous_modules;
32 SCM module = scm_car (s);
33 SCM closure = SCM_MODULE_EVAL_CLOSURE(module);
34 SCM prop = scm_procedure_property (closure, ly_symbol2scm ("module"));
36 if (ly_is_module (prop))
38 scm_set_procedure_property_x (closure, ly_symbol2scm ("module"),
43 anonymous_modules = SCM_EOL;
47 return SCM_UNSPECIFIED;
51 ly_make_anonymous_module (bool safe)
56 SCM maker = ly_lily_module_constant ("make-module");
58 SCM scm_module = ly_lily_module_constant ("the-scm-module");
60 mod = scm_call_0 (maker);
61 scm_module_define (mod, ly_symbol2scm ("%module-public-interface"),
64 ly_use_module (mod, scm_module);
65 ly_use_module (mod, global_lily_module);
69 SCM proc = ly_lily_module_constant ("make-safe-lilypond-module");
70 mod = scm_call_0 (proc);
73 #ifdef MODULE_GC_KLUDGE
74 anonymous_modules = scm_cons (mod, anonymous_modules);
81 ly_use_module (SCM mod, SCM used)
84 = scm_list_3 (ly_symbol2scm ("module-use!"),
86 scm_list_2 (ly_symbol2scm ("module-public-interface"),
89 return scm_eval (expr, global_lily_module);
92 #define FUNC_NAME __FUNCTION__
95 module_define_closure_func (void *closure, SCM key, SCM val, SCM result)
98 SCM module = (SCM) closure;
99 if (scm_variable_bound_p (val) == SCM_BOOL_T)
100 scm_module_define (module, key, scm_variable_ref (val));
104 /* Ugh signature of scm_internal_hash_fold () is inaccurate. */
105 typedef SCM (*Hash_cl_func) ();
108 If a variable in changed in SRC, we DEST doesn't see the
111 LY_DEFINE (ly_module_copy, "ly:module-copy",
112 2, 0, 0, (SCM dest, SCM src),
113 "Copy all bindings from module SRC into DEST.")
115 SCM_VALIDATE_MODULE (1, src);
116 scm_internal_hash_fold ((Hash_cl_func) & module_define_closure_func,
118 SCM_EOL, SCM_MODULE_OBARRAY (src));
119 return SCM_UNSPECIFIED;
123 accumulate_symbol (void *closure, SCM key, SCM val, SCM result)
127 return scm_cons (key, result);
131 ly_module_symbols (SCM mod)
133 SCM_VALIDATE_MODULE (1, mod);
135 SCM obarr = SCM_MODULE_OBARRAY (mod);
136 return scm_internal_hash_fold ((Hash_cl_func) & accumulate_symbol,
137 NULL, SCM_EOL, obarr);
141 entry_to_alist (void *closure, SCM key, SCM val, SCM result)
144 if (scm_variable_bound_p (val) == SCM_BOOL_T)
145 return scm_cons (scm_cons (key, scm_variable_ref (val)), result);
146 programming_error ("unbound variable in module");
150 LY_DEFINE (ly_module2alist, "ly:module->alist",
152 "Dump the contents of module @var{mod} as an alist.")
154 SCM_VALIDATE_MODULE (1, mod);
155 SCM obarr = SCM_MODULE_OBARRAY (mod);
157 return scm_internal_hash_fold ((Hash_cl_func) & entry_to_alist, NULL, SCM_EOL, obarr);
160 /* Lookup SYM, but don't give error when it is not defined. */
162 ly_module_lookup (SCM module, SCM sym)
164 #define FUNC_NAME __FUNCTION__
165 SCM_VALIDATE_MODULE (1, module);
167 return scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_F);
171 /* Lookup SYM in a list of modules, which do not have to be related.
172 Return the first instance. */
173 LY_DEFINE (ly_modules_lookup, "ly:modules-lookup",
175 (SCM modules, SCM sym, SCM def),
176 "Lookup @var{sym} in the list @var{modules}, "
177 "returning the first occurence. "
178 "If not found, return @var{default}, or @code{#f}.")
180 for (SCM s = modules; scm_is_pair (s); s = scm_cdr (s))
182 SCM mod = scm_car (s);
183 SCM v = ly_module_lookup (mod, sym);
184 if (SCM_VARIABLEP (v) && SCM_VARIABLE_REF (v) != SCM_UNDEFINED)
185 return scm_variable_ref (v);
188 if (def != SCM_UNDEFINED)
194 ly_export (SCM module, SCM namelist)
196 static SCM export_function;
197 if (!export_function)
198 export_function = scm_permanent_object (scm_c_lookup ("module-export!"));
200 scm_call_2 (SCM_VARIABLE_REF (export_function), module, namelist);
204 ly_reexport_module (SCM mod)
206 ly_export (mod, ly_module_symbols (mod));