Merge pull request #221 from siuying/evaluator-open

make Evaluator open class

Sources/Evaluator.swift

@@ -11,8 +11,8 @@ import Foundation
 /**
  * Evaluates that an element matches the selector.
  */
-public class Evaluator {
-    init () {}
+open class Evaluator {
+    public init () {}
 
     /**
      * Test if the element meets the evaluator's requirements.

Sources/Pattern.swift

@@ -23,7 +23,7 @@ public struct Pattern {
         return Pattern(s)
     }
 
-    func validate()throws {
+    public func validate()throws {
          _ = try NSRegularExpression(pattern: self.pattern, options: [])
     }