Import guile-1.8 as multiple upstream tarball component

[lilypond.git] / guile18 / libguile / evalext.c

diff --git a/guile18/libguile/evalext.c b/guile18/libguile/evalext.c
new file mode 100644 (file)
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+++ b/guile18/libguile/evalext.c
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+/* Copyright (C) 1998,1999,2000,2001,2002,2003, 2006, 2008 Free Software Foundation, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+\f
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "libguile/_scm.h"
+#include "libguile/eval.h"
+#include "libguile/fluids.h"
+#include "libguile/modules.h"
+
+#include "libguile/validate.h"
+#include "libguile/evalext.h"
+
+SCM_DEFINE (scm_defined_p, "defined?", 1, 1, 0,
+            (SCM sym, SCM env),
+           "Return @code{#t} if @var{sym} is defined in the lexical "
+           "environment @var{env}.  When @var{env} is not specified, "
+           "look in the top-level environment as defined by the "
+           "current module.")
+#define FUNC_NAME s_scm_defined_p
+{
+  SCM var;
+
+  SCM_VALIDATE_SYMBOL (1, sym);
+
+  if (SCM_UNBNDP (env))
+    var = scm_sym2var (sym, scm_current_module_lookup_closure (),
+                        SCM_BOOL_F);
+  else
+    {
+      SCM frames = env;
+      register SCM b;
+      for (; SCM_NIMP (frames); frames = SCM_CDR (frames))
+       {
+         SCM_ASSERT (scm_is_pair (frames), env, SCM_ARG2, FUNC_NAME);
+         b = SCM_CAR (frames);
+         if (scm_is_true (scm_procedure_p (b)))
+           break;
+         SCM_ASSERT (scm_is_pair (b), env, SCM_ARG2, FUNC_NAME);
+         for (b = SCM_CAR (b); SCM_NIMP (b); b = SCM_CDR (b))
+           {
+             if (!scm_is_pair (b))
+               {
+                 if (scm_is_eq (b, sym))
+                   return SCM_BOOL_T;
+                 else
+                   break;
+               }
+             if (scm_is_eq (SCM_CAR (b), sym))
+               return SCM_BOOL_T;
+           }
+       }
+      var = scm_sym2var (sym,
+                        SCM_NIMP (frames) ? SCM_CAR (frames) : SCM_BOOL_F,
+                        SCM_BOOL_F);
+    }
+             
+  return (scm_is_false (var) || SCM_UNBNDP (SCM_VARIABLE_REF (var))
+         ? SCM_BOOL_F
+         : SCM_BOOL_T);
+}
+#undef FUNC_NAME
+
+
+SCM_REGISTER_PROC (s_map_in_order, "map-in-order", 2, 0, 1, scm_map);
+
+
+SCM_DEFINE (scm_self_evaluating_p, "self-evaluating?", 1, 0, 0,
+           (SCM obj),
+           "Return #t for objects which Guile considers self-evaluating")
+#define FUNC_NAME s_scm_self_evaluating_p
+{
+  switch (SCM_ITAG3 (obj))
+    {
+    case scm_tc3_int_1:
+    case scm_tc3_int_2:
+      /* inum */
+      return SCM_BOOL_T;
+    case scm_tc3_imm24:
+       /* characters, booleans, other immediates */
+      return scm_from_bool (!scm_is_null (obj));
+    case scm_tc3_cons:
+      switch (SCM_TYP7 (obj))
+       {
+       case scm_tcs_closures:
+       case scm_tc7_vector:
+       case scm_tc7_wvect:
+       case scm_tc7_number:
+       case scm_tc7_string:
+       case scm_tc7_smob:
+       case scm_tc7_cclo:
+       case scm_tc7_pws:
+       case scm_tcs_subrs:
+       case scm_tcs_struct:
+         return SCM_BOOL_T;
+       default:
+         return SCM_BOOL_F;
+       }
+    }
+  SCM_MISC_ERROR ("Internal error: Object ~S has unknown type",
+                 scm_list_1 (obj));
+  return SCM_UNSPECIFIED; /* never reached */
+}
+#undef FUNC_NAME
+
+void 
+scm_init_evalext ()
+{
+#include "libguile/evalext.x"
+}
+
+/*
+  Local Variables:
+  c-file-style: "gnu"
+  End:
+*/