1 files changed, 71 insertions, 0 deletions
diff --git a/jni/ruby/lib/irb/ext/tracer.rb b/jni/ruby/lib/irb/ext/tracer.rb
new file mode 100644
index 0000000..691215a
--- /dev/null
+++ b/jni/ruby/lib/irb/ext/tracer.rb
@@ -0,0 +1,71 @@
+#
+#   irb/lib/tracer.rb -
+#   	$Release Version: 0.9.6$
+#   	$Revision: 47112 $
+#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
+#
+# --
+#
+#
+#
+require "tracer"
+
+module IRB
+
+  # initialize tracing function
+  def IRB.initialize_tracer
+    Tracer.verbose = false
+    Tracer.add_filter {
+      |event, file, line, id, binding, *rests|
+      /^#{Regexp.quote(@CONF[:IRB_LIB_PATH])}/ !~ file and
+        File::basename(file) != "irb.rb"
+    }
+  end
+
+  class Context
+    # Whether Tracer is used when evaluating statements in this context.
+    #
+    # See +lib/tracer.rb+ for more information.
+    attr_reader :use_tracer
+    alias use_tracer? use_tracer
+
+    # Sets whether or not to use the Tracer library when evaluating statements
+    # in this context.
+    #
+    # See +lib/tracer.rb+ for more information.
+    def use_tracer=(opt)
+      if opt
+        Tracer.set_get_line_procs(@irb_path) {
+          |line_no, *rests|
+          @io.line(line_no)
+        }
+      elsif !opt && @use_tracer
+        Tracer.off
+      end
+      @use_tracer=opt
+    end
+  end
+
+  class WorkSpace
+    alias __evaluate__ evaluate
+    # Evaluate the context of this workspace and use the Tracer library to
+    # output the exact lines of code are being executed in chronological order.
+    #
+    # See +lib/tracer.rb+ for more information.
+    def evaluate(context, statements, file = nil, line = nil)
+      if context.use_tracer? && file != nil && line != nil
+        Tracer.on
+        begin
+          __evaluate__(context, statements, file, line)
+        ensure
+          Tracer.off
+        end
+      else
+        __evaluate__(context, statements, file || __FILE__, line || __LINE__)
+      end
+    end
+  end
+
+  IRB.initialize_tracer
+end
+