1 files changed, 27 insertions, 0 deletions
diff --git a/mrbgems/mruby-catch/mrblib/catch.rb b/mrbgems/mruby-catch/mrblib/catch.rb
new file mode 100644
index 000000000..89eedf66a
--- /dev/null
+++ b/mrbgems/mruby-catch/mrblib/catch.rb
@@ -0,0 +1,27 @@
+class ThrowCatchJump < Exception
+  def initialize(tag, val)
+    @tag = tag
+    @val = val
+    super("uncaught throw :#{tag}")
+  end
+  def _tag
+    @tag
+  end
+  def _val
+    @val
+  end
+end
+
+module Kernel
+  def catch(tag, &block)
+    block.call(tag)
+  rescue ThrowCatchJump => e
+    unless e._tag == tag
+      raise e
+    end
+    return e._val
+  end
+  def throw(tag, val=nil)
+    raise ThrowCatchJump.new(tag, val)
+  end
+end