Add in-tree mspec and ruby/spec

* For easier modifications of ruby/spec by MRI developers.
* .gitignore: track changes under spec.
* spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec.
  These files can therefore be updated like any other file in MRI.
  Instructions are provided in spec/README.
  [Feature #13156] [ruby-core:79246]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 27 insertions, 0 deletions

diff --git a/spec/mspec/lib/mspec/guards/endian.rb b/spec/mspec/lib/mspec/guards/endian.rb
new file mode 100644
index 0000000000..6bb01263c7
--- /dev/null
+++ b/spec/mspec/lib/mspec/guards/endian.rb
@@ -0,0 +1,27 @@
+require 'mspec/guards/guard'
+
+# Despite that these are inverses, the two classes are
+# used to simplify MSpec guard reporting modes
+
+class EndianGuard < SpecGuard
+  def pattern
+    @pattern ||= [1].pack('L')
+  end
+  private :pattern
+end
+
+class BigEndianGuard < EndianGuard
+  def match?
+    pattern[-1] == ?\001
+  end
+end
+
+class Object
+  def big_endian(&block)
+    BigEndianGuard.new.run_if(:big_endian, &block)
+  end
+
+  def little_endian(&block)
+    BigEndianGuard.new.run_unless(:little_endian, &block)
+  end
+end