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"
14 #define FUNC_NAME __FUNCTION__
17 ly_make_anonymous_module (bool safe)
22 SCM maker = ly_lily_module_constant ("make-module");
24 SCM scm_module = ly_lily_module_constant ("the-scm-module");
26 mod = scm_call_0 (maker);
27 scm_module_define (mod, ly_symbol2scm ("%module-public-interface"),
30 ly_use_module (mod, scm_module);
31 ly_use_module (mod, global_lily_module);
35 SCM proc = ly_lily_module_constant ("make-safe-lilypond-module");
36 mod = scm_call_0 (proc);
42 ly_use_module (SCM mod, SCM used)
45 = scm_list_3 (ly_symbol2scm ("module-use!"),
47 scm_list_2 (ly_symbol2scm ("module-public-interface"),
50 return scm_eval (expr, global_lily_module);
53 #define FUNC_NAME __FUNCTION__
56 module_define_closure_func (void *closure, SCM key, SCM val, SCM result)
59 SCM module = (SCM) closure;
60 if (scm_variable_bound_p (val) == SCM_BOOL_T)
61 scm_module_define (module, key, scm_variable_ref (val));
65 /* Ugh signature of scm_internal_hash_fold () is inaccurate. */
66 typedef SCM (*Hash_cl_func) ();
69 If a variable in changed in SRC, we DEST doesn't see the
72 LY_DEFINE (ly_module_copy, "ly:module-copy",
73 2, 0, 0, (SCM dest, SCM src),
74 "Copy all bindings from module SRC into DEST.")
76 SCM_VALIDATE_MODULE (1, src);
77 scm_internal_hash_fold ((Hash_cl_func) & module_define_closure_func,
79 SCM_EOL, SCM_MODULE_OBARRAY (src));
80 return SCM_UNSPECIFIED;
84 accumulate_symbol (void *closure, SCM key, SCM val, SCM result)
88 return scm_cons (key, result);
92 ly_module_symbols (SCM mod)
94 SCM_VALIDATE_MODULE (1, mod);
96 SCM obarr = SCM_MODULE_OBARRAY (mod);
97 return scm_internal_hash_fold ((Hash_cl_func) & accumulate_symbol,
98 NULL, SCM_EOL, obarr);
102 entry_to_alist (void *closure, SCM key, SCM val, SCM result)
105 if (scm_variable_bound_p (val) == SCM_BOOL_T)
106 return scm_cons (scm_cons (key, scm_variable_ref (val)), result);
107 programming_error ("unbound variable in module");
111 LY_DEFINE (ly_module2alist, "ly:module->alist",
113 "Dump the contents of module @var{mod} as an alist.")
115 SCM_VALIDATE_MODULE (1, mod);
116 SCM obarr = SCM_MODULE_OBARRAY (mod);
118 return scm_internal_hash_fold ((Hash_cl_func) & entry_to_alist, NULL, SCM_EOL, obarr);
121 /* Lookup SYM, but don't give error when it is not defined. */
123 ly_module_lookup (SCM module, SCM sym)
125 #define FUNC_NAME __FUNCTION__
126 SCM_VALIDATE_MODULE (1, module);
128 return scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_F);
132 /* Lookup SYM in a list of modules, which do not have to be related.
133 Return the first instance. */
134 LY_DEFINE (ly_modules_lookup, "ly:modules-lookup",
136 (SCM modules, SCM sym, SCM def),
137 "Lookup @var{sym} in the list @var{modules}, "
138 "returning the first occurence. "
139 "If not found, return @var{default}, or @code{#f}.")
141 for (SCM s = modules; scm_is_pair (s); s = scm_cdr (s))
143 SCM mod = scm_car (s);
144 SCM v = ly_module_lookup (mod, sym);
145 if (SCM_VARIABLEP (v) && SCM_VARIABLE_REF (v) != SCM_UNDEFINED)
146 return scm_variable_ref (v);
149 if (def != SCM_UNDEFINED)
155 ly_export (SCM module, SCM namelist)
157 static SCM export_function;
158 if (!export_function)
159 export_function = scm_permanent_object (scm_c_lookup ("module-export!"));
161 scm_call_2 (SCM_VARIABLE_REF (export_function), module, namelist);
165 ly_reexport_module (SCM mod)
167 ly_export (mod, ly_module_symbols (mod));