lily/ly-module.cc

   1 /*
   2 ly-module.cc --  implement guile module stuff.
   3
   4 source file of the GNU LilyPond music typesetter
   5
   6 (c) 2002--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "string.hh"
  11 #include "lily-guile.hh"
  12 #include "ly-modules.hh"
  13 #include "protected-scm.hh"
  14
  15 #define FUNC_NAME __FUNCTION__
  16
  17 static int module_count;
  18
  19 void
  20 ly_init_anonymous_module (void * data)
  21 {
  22   scm_c_use_module ("lily");
  23 }
  24
  25 Protected_scm anon_modules;
  26
  27 SCM
  28 ly_make_anonymous_module ()
  29 {
  30   String s = "*anonymous-ly-" + to_string (module_count++) +  "*";
  31   SCM mod = scm_c_define_module (s.to_str0(), ly_init_anonymous_module, 0);
  32
  33   anon_modules = scm_cons (mod, anon_modules);
  34   return mod;
  35 }
  36
  37 void
  38 ly_clear_anonymous_modules ()
  39 {
  40   SCM s = anon_modules;
  41   anon_modules = SCM_EOL;
  42
  43   for (; gh_pair_p (s) ; s = gh_cdr (s))
  44     {
  45       SCM tab= scm_c_make_hash_table (2);
  46       /*
  47         UGH.
  48       */
  49
  50       SCM_STRUCT_DATA(gh_car(s))[scm_module_index_obarray] = (long unsigned int) tab;
  51     }
  52 }
  53
  54 #define FUNC_NAME __FUNCTION__
  55
  56 SCM
  57 define_one_var (void * closure, SCM key, SCM val, SCM result)
  58 {
  59   SCM dest =  (SCM) closure;
  60   scm_module_define (dest, key, scm_variable_ref (val));
  61   return SCM_EOL;
  62 }
  63
  64 /*
  65   Ugh signature of scm_internal_hash_fold () is inaccurate.
  66  */
  67 typedef SCM (*Hash_cl_func)();
  68
  69 void
  70 ly_copy_module_variables (SCM dest, SCM src)
  71 {
  72   SCM_VALIDATE_MODULE (1, src);
  73
  74   SCM obarr= SCM_MODULE_OBARRAY(src);
  75   scm_internal_hash_fold ((Hash_cl_func) &define_one_var, (void*) dest, SCM_EOL, obarr);
  76 }
  77
  78 SCM
  79 accumulate_symbol (void * closure, SCM key, SCM val, SCM result)
  80 {
  81   return scm_cons (key, result);
  82 }
  83
  84 SCM
  85 ly_module_symbols (SCM mod)
  86 {
  87   SCM_VALIDATE_MODULE (1, mod);
  88
  89   SCM obarr= SCM_MODULE_OBARRAY(mod);
  90   return scm_internal_hash_fold ((Hash_cl_func) &accumulate_symbol, NULL, SCM_EOL, obarr);
  91 }
  92
  93 SCM
  94 entry_to_alist (void * closure, SCM key, SCM val, SCM result)
  95 {
  96   return scm_cons (scm_cons (key, scm_variable_ref (val)), result);
  97 }
  98
  99 SCM
 100 ly_module_to_alist (SCM mod)
 101 {
 102   SCM_VALIDATE_MODULE (1, mod);
 103
 104
 105   SCM obarr= SCM_MODULE_OBARRAY(mod);
 106
 107   return scm_internal_hash_fold ((Hash_cl_func) &entry_to_alist, NULL, SCM_EOL, obarr);
 108 }
 109
 110 /*
 111   Lookup SYM, but don't give error when it is not defined.
 112  */
 113 SCM
 114 ly_module_lookup (SCM module, SCM sym)
 115 {
 116 #define FUNC_NAME __FUNCTION__
 117   SCM_VALIDATE_MODULE (1, module);
 118
 119   return scm_sym2var (sym, scm_module_lookup_closure (module), SCM_BOOL_F);
 120 }
 121
 122 SCM export_function ;
 123
 124 void
 125 ly_export (SCM module, SCM namelist)
 126 {
 127   if (!export_function)
 128     {
 129       export_function = scm_permanent_object (scm_c_lookup ("module-export!"));
 130     }
 131
 132   scm_call_2 (SCM_VARIABLE_REF (export_function),
 133               module, namelist);
 134 }
 135
 136 void
 137 ly_reexport_module (SCM mod)
 138 {
 139   ly_export (mod, ly_module_symbols (mod));
 140 }