added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 36 insertions, 0 deletions

diff --git a/trunk/lib/irb/ext/math-mode.rb b/trunk/lib/irb/ext/math-mode.rb
new file mode 100644
index 0000000000..450a21eff7
--- /dev/null
+++ b/trunk/lib/irb/ext/math-mode.rb
@@ -0,0 +1,36 @@
+#
+#   math-mode.rb - 
+#   	$Release Version: 0.9.5$
+#   	$Revision$
+#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+# --
+#
+#   
+#
+require "mathn"
+
+module IRB
+  class Context
+    attr_reader :math_mode
+    alias math? math_mode
+
+    def math_mode=(opt)
+      if @math_mode == true && opt == false
+	IRB.fail CantReturnToNormalMode
+	return
+      end
+
+      @math_mode = opt
+      if math_mode
+	main.extend Math
+	print "start math mode\n" if verbose?
+      end
+    end
+
+    def inspect?
+      @inspect_mode.nil? && !@math_mode or @inspect_mode
+    end
+  end
+end
+