2 ly-module.cc -- implement guile module stuff.
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "ly-module.hh"
14 #define FUNC_NAME __FUNCTION__
16 static int module_count;
19 ly_init_anonymous_module (void *data)
25 ly_make_anonymous_module (bool safe)
30 String s = "*anonymous-ly-" + to_string (module_count++) + "*";
31 mod = scm_c_define_module (s.to_str0 (), ly_init_anonymous_module, 0);
32 ly_use_module (mod, global_lily_module);
36 SCM proc = ly_scheme_function ("make-safe-lilypond-module");
37 mod = scm_call_0 (proc);
43 ly_use_module (SCM mod, SCM used)
46 = scm_list_3 (ly_symbol2scm ("module-use!"),
48 scm_list_2 (ly_symbol2scm ("module-public-interface"),
51 return scm_eval (expr, global_lily_module);
54 #define FUNC_NAME __FUNCTION__
57 ly_module_define (void *closure, SCM key, SCM val, SCM result)
60 SCM module = (SCM) closure;
61 if (scm_variable_bound_p (val) == SCM_BOOL_T)
62 scm_module_define (module, key, scm_variable_ref (val));
66 /* Ugh signature of scm_internal_hash_fold () is inaccurate. */
67 typedef SCM (*Hash_cl_func)();
70 Check me. This is NOT an actual import. It just copies the
73 If a variable in changed in SRC, we DEST doesn't see the
76 LY_DEFINE (ly_import_module, "ly:import-module",
77 2, 0, 0, (SCM dest, SCM src),
78 "Import all bindings from module SRC into DEST.")
80 SCM_VALIDATE_MODULE (1, src);
81 scm_internal_hash_fold ((Hash_cl_func) &ly_module_define, (void*) dest,
82 SCM_EOL, SCM_MODULE_OBARRAY (src));
83 return SCM_UNSPECIFIED;
87 accumulate_symbol (void *closure, SCM key, SCM val, SCM result)
91 return scm_cons (key, result);
95 ly_module_symbols (SCM mod)
97 SCM_VALIDATE_MODULE (1, mod);
99 SCM obarr= SCM_MODULE_OBARRAY (mod);
100 return scm_internal_hash_fold ((Hash_cl_func) &accumulate_symbol,
101 NULL, SCM_EOL, obarr);
105 entry_to_alist (void *closure, SCM key, SCM val, SCM result)
108 if (scm_variable_bound_p (val) == SCM_BOOL_T)
110 return scm_cons (scm_cons (key, scm_variable_ref (val)), result);
114 programming_error ("Unbound variable in module.");
119 LY_DEFINE (ly_module2alist, "ly:module->alist",
121 "Dump the contents of module @var{mod} as an alist.")
123 SCM_VALIDATE_MODULE (1, mod);
124 SCM obarr= SCM_MODULE_OBARRAY (mod);
126 return scm_internal_hash_fold ((Hash_cl_func) &entry_to_alist, NULL, SCM_EOL, obarr);
129 /* Lookup SYM, but don't give error when it is not defined. */
131 ly_module_lookup (SCM module, SCM sym)
133 #define FUNC_NAME __FUNCTION__
134 SCM_VALIDATE_MODULE (1, module);
136 return scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_F);
140 /* Lookup SYM in a list of modules, which do not have to be related.
141 Return the first instance. */
142 LY_DEFINE (ly_modules_lookup, "ly:modules-lookup",
144 (SCM modules, SCM sym, SCM def),
145 "Lookup @var{sym} in the list @var{modules}, "
146 "returning the first occurence. "
147 "If not found, return @var{default}, or @code{#f}.")
149 for (SCM s = modules; scm_is_pair (s); s = scm_cdr (s))
151 SCM mod = scm_car (s);
152 SCM v = ly_module_lookup (mod, sym);
153 if (SCM_VARIABLEP (v) && SCM_VARIABLE_REF (v) != SCM_UNDEFINED)
154 return scm_variable_ref(v);
157 if (def != SCM_UNDEFINED)
163 ly_export (SCM module, SCM namelist)
165 static SCM export_function;
166 if (!export_function)
167 export_function = scm_permanent_object (scm_c_lookup ("module-export!"));
169 scm_call_2 (SCM_VARIABLE_REF (export_function), module, namelist);
173 ly_reexport_module (SCM mod)
175 ly_export (mod, ly_module_symbols (mod));