mbed-mruby

Diff: mrbgems/mruby-object-ext/object.c

Revision:

0:158c61bb030f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mrbgems/mruby-object-ext/object.c	Wed Mar 25 17:36:16 2015 +0000
@@ -0,0 +1,106 @@
+#include "mruby.h"
+#include "mruby/array.h"
+#include "mruby/class.h"
+
+/*
+ *  call-seq:
+ *     nil.to_a    -> []
+ *
+ *  Always returns an empty array.
+ */
+
+static mrb_value
+nil_to_a(mrb_state *mrb, mrb_value obj)
+{
+  return mrb_ary_new(mrb);
+}
+
+/*
+ *  call-seq:
+ *     nil.to_f    -> 0.0
+ *
+ *  Always returns zero.
+ */
+
+static mrb_value
+nil_to_f(mrb_state *mrb, mrb_value obj)
+{
+  return mrb_float_value(mrb, 0.0);
+}
+
+/*
+ *  call-seq:
+ *     nil.to_i    -> 0
+ *
+ *  Always returns zero.
+ */
+
+static mrb_value
+nil_to_i(mrb_state *mrb, mrb_value obj)
+{
+  return mrb_fixnum_value(0);
+}
+
+/*
+ *  call-seq:
+ *     obj.instance_exec(arg...) {|var...| block }                       -> obj
+ *
+ *  Executes the given block within the context of the receiver
+ *  (_obj_). In order to set the context, the variable +self+ is set
+ *  to _obj_ while the code is executing, giving the code access to
+ *  _obj_'s instance variables.  Arguments are passed as block parameters.
+ *
+ *     class KlassWithSecret
+ *       def initialize
+ *         @secret = 99
+ *       end
+ *     end
+ *     k = KlassWithSecret.new
+ *     k.instance_exec(5) {|x| @secret+x }   #=> 104
+ */
+
+static mrb_value
+mrb_obj_instance_exec(mrb_state *mrb, mrb_value self)
+{
+  mrb_value *argv;
+  mrb_int argc;
+  mrb_value blk;
+  struct RClass *c;
+
+  mrb_get_args(mrb, "*&", &argv, &argc, &blk);
+
+  if (mrb_nil_p(blk)) {
+    mrb_raise(mrb, E_ARGUMENT_ERROR, "no block given");
+  }
+
+  switch (mrb_type(self)) {
+  case MRB_TT_SYMBOL:
+  case MRB_TT_FIXNUM:
+  case MRB_TT_FLOAT:
+    c = NULL;
+    break;
+  default:
+    c = mrb_class_ptr(mrb_singleton_class(mrb, self));
+    break;
+  }
+
+  return mrb_yield_with_class(mrb, blk, argc, argv, self, c);
+}
+
+void
+mrb_mruby_object_ext_gem_init(mrb_state* mrb)
+{
+  struct RClass * n = mrb->nil_class;
+
+  mrb_define_method(mrb, n, "to_a", nil_to_a,       MRB_ARGS_NONE());
+  mrb_define_method(mrb, n, "to_f", nil_to_f,       MRB_ARGS_NONE());
+  mrb_define_method(mrb, n, "to_i", nil_to_i,       MRB_ARGS_NONE());
+
+  mrb_define_method(mrb, mrb->object_class, "instance_exec", mrb_obj_instance_exec, MRB_ARGS_ANY() | MRB_ARGS_BLOCK());
+}
+
+void
+mrb_mruby_object_ext_gem_final(mrb_state* mrb)
+{
+}
+