Range#intersects? never acts like an interval includes its start value

nathansobo · Mar 14, 2008 · b6ffcfd · b6ffcfd
1 parent 1f9b12a
commit b6ffcfd
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/lib/treetop/ruby_extensions/range.rb b/lib/treetop/ruby_extensions/range.rb
@@ -3,7 +3,7 @@ def intersects?(other_range)
     if exclude_end?
       return false if last <= other_range.first || first >= other_range.last
     else
-      return false if last < other_range.first || first > other_range.last
+      return false if last < other_range.first || (first >= other_range.last && first != last)
     end
     true
   end

diff --git a/spec/ruby_extensions/range_spec.rb b/spec/ruby_extensions/range_spec.rb
@@ -16,6 +16,10 @@
       (5..5).intersects?(1..5).should be_true
     end
 
+    it "is false for an endpoint-inclusive interval whose #first is == to the argument's #last" do
+      (5..10).intersects?(1..5).should be_false
+    end
+
     it "is false for an interval whose #first is >= than the argument's #last" do
       (11...15).intersects?(5..10).should be_false
       (10...15).intersects?(5..10).should be_false