1 files changed, 52 insertions, 0 deletions
diff --git a/spec/mspec/lib/mspec/utils/version.rb b/spec/mspec/lib/mspec/utils/version.rb
new file mode 100644
index 0000000000..787a76b053
--- /dev/null
+++ b/spec/mspec/lib/mspec/utils/version.rb
@@ -0,0 +1,52 @@
+class SpecVersion
+  # If beginning implementations have a problem with this include, we can
+  # manually implement the relational operators that are needed.
+  include Comparable
+
+  # SpecVersion handles comparison correctly for the context by filling in
+  # missing version parts according to the value of +ceil+. If +ceil+ is
+  # +false+, 0 digits fill in missing version parts. If +ceil+ is +true+, 9
+  # digits fill in missing parts. (See e.g. VersionGuard and BugGuard.)
+  def initialize(version, ceil = false)
+    @version = version
+    @ceil    = ceil
+    @integer = nil
+  end
+
+  def to_s
+    @version
+  end
+
+  def to_str
+    to_s
+  end
+
+  # Converts a string representation of a version major.minor.tiny
+  # to an integer representation so that comparisons can be made. For example,
+  # "2.2.10" < "2.2.2" would be false if compared as strings.
+  def to_i
+    unless @integer
+      major, minor, tiny = @version.split "."
+      if @ceil
+        tiny = 99 unless tiny
+      end
+      parts = [major, minor, tiny].map { |x| x.to_i }
+      @integer = ("1%02d%02d%02d" % parts).to_i
+    end
+    @integer
+  end
+
+  def to_int
+    to_i
+  end
+
+  def <=>(other)
+    if other.respond_to? :to_int
+      other = Integer other
+    else
+      other = SpecVersion.new(String(other)).to_i
+    end
+
+    self.to_i <=> other
+  end
+end