Fix issue #175 - Size evaluation could break indefinite path evaluation

json-path/src/main/java/com/jayway/jsonpath/internal/filter/EvaluatorFactory.java

@@ -138,6 +138,9 @@ public class EvaluatorFactory {
     private static class SizeEvaluator implements Evaluator {
         @Override
         public boolean evaluate(ValueNode left, ValueNode right, Predicate.PredicateContext ctx) {
+            if (! right.isNumberNode()) {
+                return false;
+            }
             int expectedSize = right.asNumberNode().getNumber().intValue();
 
             if(left.isStringNode()){

json-path/src/test/java/com/jayway/jsonpath/InlineFilterTest.java

@@ -209,4 +209,9 @@ public class InlineFilterTest extends BaseTest {
     public void escape_pattern() {
         assertHasOneResult("[\"x\"]", "$[?(@ =~ /\\/|x/)]", conf);
     }
+
+    @Test
+    public void filter_evaluation_does_not_break_path_evaluation() {
+        assertHasOneResult("[{\"s\": \"fo\", \"expected_size\": \"m\"}, {\"s\": \"lo\", \"expected_size\": 2}]", "$[?(@.s size @.expected_size)]", conf);
+    }
 }