4 files changed, 160 insertions, 0 deletions
diff --git a/mrbgems/mruby-numeric-ext/mrbgem.rake b/mrbgems/mruby-numeric-ext/mrbgem.rake
new file mode 100644
index 000000000..6db7e589e
--- /dev/null
+++ b/mrbgems/mruby-numeric-ext/mrbgem.rake
@@ -0,0 +1,5 @@
+MRuby::Gem::Specification.new('mruby-numeric-ext') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'Numeric class extension'
+end
diff --git a/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb b/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
new file mode 100644
index 000000000..f250538fe
--- /dev/null
+++ b/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb
@@ -0,0 +1,25 @@
+module Integral
+  def div(other)
+    self.divmod(other)[0]
+  end
+
+  def zero?
+    self == 0
+  end
+
+  def nonzero?
+    if self == 0
+      nil
+    else
+      self
+    end
+  end
+
+  def positive?
+    self > 0
+  end
+
+  def negative?
+    self < 0
+  end
+end
diff --git a/mrbgems/mruby-numeric-ext/src/numeric_ext.c b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
new file mode 100644
index 000000000..1d6a07769
--- /dev/null
+++ b/mrbgems/mruby-numeric-ext/src/numeric_ext.c
@@ -0,0 +1,102 @@
+#include <limits.h>
+#include <mruby.h>
+
+static inline mrb_int
+to_int(mrb_value x)
+{
+  double f;
+
+  if (mrb_fixnum_p(x)) return mrb_fixnum(x);
+  f = mrb_float(x);
+  return (mrb_int)f;
+}
+
+/*
+ *  Document-method: Integer#chr
+ *  call-seq:
+ *     int.chr  ->  string
+ *
+ *  Returns a string containing the character represented by the +int+'s value
+ *  according to +encoding+.
+ *
+ *     65.chr    #=> "A"
+ *     230.chr   #=> "\xE6"
+ */
+static mrb_value
+mrb_int_chr(mrb_state *mrb, mrb_value x)
+{
+  mrb_int chr;
+  char c;
+
+  chr = to_int(x);
+  if (chr >= (1 << CHAR_BIT)) {
+    mrb_raisef(mrb, E_RANGE_ERROR, "%S out of char range", x);
+  }
+  c = (char)chr;
+
+  return mrb_str_new(mrb, &c, 1);
+}
+
+/*
+ *  call-seq:
+ *     int.allbits?(mask)  ->  true or false
+ *
+ *  Returns +true+ if all bits of <code>+int+ & +mask+</code> are 1.
+ */
+static mrb_value
+mrb_int_allbits(mrb_state *mrb, mrb_value self)
+{
+  mrb_int n, m;
+
+  n = to_int(self);
+  mrb_get_args(mrb, "i", &m);
+  return mrb_bool_value((n & m) == m);
+}
+
+/*
+ *  call-seq:
+ *     int.anybits?(mask)  ->  true or false
+ *
+ *  Returns +true+ if any bits of <code>+int+ & +mask+</code> are 1.
+ */
+static mrb_value
+mrb_int_anybits(mrb_state *mrb, mrb_value self)
+{
+  mrb_int n, m;
+
+  n = to_int(self);
+  mrb_get_args(mrb, "i", &m);
+  return mrb_bool_value((n & m) != 0);
+}
+
+/*
+ *  call-seq:
+ *     int.nobits?(mask)  ->  true or false
+ *
+ *  Returns +true+ if no bits of <code>+int+ & +mask+</code> are 1.
+ */
+static mrb_value
+mrb_int_nobits(mrb_state *mrb, mrb_value self)
+{
+  mrb_int n, m;
+
+  n = to_int(self);
+  mrb_get_args(mrb, "i", &m);
+  return mrb_bool_value((n & m) == 0);
+}
+
+void
+mrb_mruby_numeric_ext_gem_init(mrb_state* mrb)
+{
+  struct RClass *i = mrb_module_get(mrb, "Integral");
+
+  mrb_define_method(mrb, i, "chr", mrb_int_chr, MRB_ARGS_NONE());
+  mrb_define_method(mrb, i, "allbits?", mrb_int_allbits, MRB_ARGS_REQ(1));
+  mrb_define_method(mrb, i, "anybits?", mrb_int_anybits, MRB_ARGS_REQ(1));
+  mrb_define_method(mrb, i, "nobits?", mrb_int_nobits, MRB_ARGS_REQ(1));
+}
+
+void
+mrb_mruby_numeric_ext_gem_final(mrb_state* mrb)
+{
+}
diff --git a/mrbgems/mruby-numeric-ext/test/numeric.rb b/mrbgems/mruby-numeric-ext/test/numeric.rb
new file mode 100644
index 000000000..6ea0c14e7
--- /dev/null
+++ b/mrbgems/mruby-numeric-ext/test/numeric.rb
@@ -0,0 +1,28 @@
+##
+# Numeric(Ext) Test
+
+assert('Integer#chr') do
+  assert_equal("A", 65.chr)
+  assert_equal("B", 0x42.chr)
+
+  # multibyte encoding (not support yet)
+  assert_raise(RangeError) { 256.chr }
+end
+
+assert('Integer#div') do
+  assert_equal 52, 365.div(7)
+end
+
+assert('Float#div') do
+  assert_float 52, 365.2425.div(7)
+end if class_defined?("Float")
+
+assert('Integer#zero?') do
+  assert_equal true, 0.zero?
+  assert_equal false, 1.zero?
+end
+
+assert('Integer#nonzero?') do
+  assert_equal nil, 0.nonzero?
+  assert_equal 1000, 1000.nonzero?
+end