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");
23 SCM scm_module = ly_lily_module_constant ("the-scm-module");
25 mod = scm_call_0 (maker);
26 ly_use_module (mod, scm_module);
27 ly_use_module (mod, global_lily_module);
31 SCM proc = ly_lily_module_constant ("make-safe-lilypond-module");
32 mod = scm_call_0 (proc);
38 ly_use_module (SCM mod, SCM used)
41 = scm_list_3 (ly_symbol2scm ("module-use!"),
43 scm_list_2 (ly_symbol2scm ("module-public-interface"),
46 return scm_eval (expr, global_lily_module);
49 #define FUNC_NAME __FUNCTION__
52 module_define_closure_func (void *closure, SCM key, SCM val, SCM result)
55 SCM module = (SCM) closure;
56 if (scm_variable_bound_p (val) == SCM_BOOL_T)
57 scm_module_define (module, key, scm_variable_ref (val));
61 /* Ugh signature of scm_internal_hash_fold () is inaccurate. */
62 typedef SCM (*Hash_cl_func) ();
65 If a variable in changed in SRC, we DEST doesn't see the
68 LY_DEFINE (ly_module_copy, "ly:module-copy",
69 2, 0, 0, (SCM dest, SCM src),
70 "Copy all bindings from module SRC into DEST.")
72 SCM_VALIDATE_MODULE (1, src);
73 scm_internal_hash_fold ((Hash_cl_func) & module_define_closure_func,
75 SCM_EOL, SCM_MODULE_OBARRAY (src));
76 return SCM_UNSPECIFIED;
80 accumulate_symbol (void *closure, SCM key, SCM val, SCM result)
84 return scm_cons (key, result);
88 ly_module_symbols (SCM mod)
90 SCM_VALIDATE_MODULE (1, mod);
92 SCM obarr = SCM_MODULE_OBARRAY (mod);
93 return scm_internal_hash_fold ((Hash_cl_func) & accumulate_symbol,
94 NULL, SCM_EOL, obarr);
98 entry_to_alist (void *closure, SCM key, SCM val, SCM result)
101 if (scm_variable_bound_p (val) == SCM_BOOL_T)
102 return scm_cons (scm_cons (key, scm_variable_ref (val)), result);
103 programming_error ("unbound variable in module");
107 LY_DEFINE (ly_module2alist, "ly:module->alist",
109 "Dump the contents of module @var{mod} as an alist.")
111 SCM_VALIDATE_MODULE (1, mod);
112 SCM obarr = SCM_MODULE_OBARRAY (mod);
114 return scm_internal_hash_fold ((Hash_cl_func) & entry_to_alist, NULL, SCM_EOL, obarr);
117 /* Lookup SYM, but don't give error when it is not defined. */
119 ly_module_lookup (SCM module, SCM sym)
121 #define FUNC_NAME __FUNCTION__
122 SCM_VALIDATE_MODULE (1, module);
124 return scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_F);
128 /* Lookup SYM in a list of modules, which do not have to be related.
129 Return the first instance. */
130 LY_DEFINE (ly_modules_lookup, "ly:modules-lookup",
132 (SCM modules, SCM sym, SCM def),
133 "Lookup @var{sym} in the list @var{modules}, "
134 "returning the first occurence. "
135 "If not found, return @var{default}, or @code{#f}.")
137 for (SCM s = modules; scm_is_pair (s); s = scm_cdr (s))
139 SCM mod = scm_car (s);
140 SCM v = ly_module_lookup (mod, sym);
141 if (SCM_VARIABLEP (v) && SCM_VARIABLE_REF (v) != SCM_UNDEFINED)
142 return scm_variable_ref (v);
145 if (def != SCM_UNDEFINED)
151 ly_export (SCM module, SCM namelist)
153 static SCM export_function;
154 if (!export_function)
155 export_function = scm_permanent_object (scm_c_lookup ("module-export!"));
157 scm_call_2 (SCM_VARIABLE_REF (export_function), module, namelist);
161 ly_reexport_module (SCM mod)
163 ly_export (mod, ly_module_symbols (mod));