libguile/evalext.c

   1 /* Copyright (C) 1998,1999,2000,2001,2002,2003, 2006, 2008, 2009, 2010, 2011, 2012, 2013, 2015 Free Software Foundation, Inc.
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public License
   5  * as published by the Free Software Foundation; either version 3 of
   6  * the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301 USA
  17  */
  18
  19
  20 \f
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include "libguile/_scm.h"
  26 #include "libguile/eval.h"
  27 #include "libguile/fluids.h"
  28 #include "libguile/modules.h"
  29
  30 #include "libguile/validate.h"
  31 #include "libguile/evalext.h"
  32
  33 SCM_DEFINE (scm_defined_p, "defined?", 1, 1, 0,
  34             (SCM sym, SCM module),
  35             "Return @code{#t} if @var{sym} is defined in the module "
  36             "@var{module} or the current module when @var{module} is not"
  37             "specified.")
  38 #define FUNC_NAME s_scm_defined_p
  39 {
  40   SCM var;
  41
  42   SCM_VALIDATE_SYMBOL (1, sym);
  43
  44   if (SCM_UNBNDP (module))
  45     module = scm_current_module ();
  46   else
  47     SCM_VALIDATE_MODULE (2, module);
  48
  49   var = scm_module_variable (module, sym);
  50
  51   return (scm_is_false (var) || SCM_UNBNDP (SCM_VARIABLE_REF (var))
  52           ? SCM_BOOL_F
  53           : SCM_BOOL_T);
  54 }
  55 #undef FUNC_NAME
  56
  57
  58 SCM_DEFINE (scm_self_evaluating_p, "self-evaluating?", 1, 0, 0,
  59             (SCM obj),
  60             "Return #t for objects which Guile considers self-evaluating")
  61 #define FUNC_NAME s_scm_self_evaluating_p
  62 {
  63   switch (SCM_ITAG3 (obj))
  64     {
  65     case scm_tc3_int_1:
  66     case scm_tc3_int_2:
  67       /* inum */
  68       return SCM_BOOL_T;
  69     case scm_tc3_imm24:
  70         /* characters, booleans, other immediates */
  71       return scm_from_bool (!scm_is_null_and_not_nil (obj));
  72     case scm_tc3_cons:
  73       switch (SCM_TYP7 (obj))
  74         {
  75         case scm_tc7_vector:
  76         case scm_tc7_wvect:
  77         case scm_tc7_pointer:
  78         case scm_tc7_hashtable:
  79         case scm_tc7_weak_set:
  80         case scm_tc7_weak_table:
  81         case scm_tc7_fluid:
  82         case scm_tc7_dynamic_state:
  83         case scm_tc7_frame:
  84         case scm_tc7_keyword:
  85         case scm_tc7_vm_cont:
  86         case scm_tc7_number:
  87         case scm_tc7_string:
  88         case scm_tc7_smob:
  89         case scm_tc7_program:
  90         case scm_tc7_bytevector:
  91         case scm_tc7_array:
  92         case scm_tc7_bitvector:
  93         case scm_tcs_struct:
  94           return SCM_BOOL_T;
  95         default:
  96           return SCM_BOOL_F;
  97         }
  98     }
  99   SCM_MISC_ERROR ("Internal error: Object ~S has unknown type",
 100                   scm_list_1 (obj));
 101   return SCM_UNSPECIFIED; /* never reached */
 102 }
 103 #undef FUNC_NAME
 104
 105 void
 106 scm_init_evalext ()
 107 {
 108 #include "libguile/evalext.x"
 109 }
 110
 111 /*
 112   Local Variables:
 113   c-file-style: "gnu"
 114   End:
 115 */