workaround issue 209

Author: dgofman

parser_expression.go

@@ -201,6 +201,13 @@ func (expr *relationalExpression) Evaluate(ctx *ExecutionContext) (*Value, *Erro
 		case "!=", "<>":
 			return AsValue(!v1.EqualValueTo(v2)), nil
 		case "in":
+			val, ok := expr.expr1.(*simpleExpression)
+			if ok && val.negate {
+				t1, err := val.term1.Evaluate(ctx)
+				if err == nil {
+					return AsValue(!v2.Contains(t1)), nil
+				}
+			}
 			return AsValue(v2.Contains(v1)), nil
 		default:
 			return nil, ctx.Error(fmt.Sprintf("unimplemented: %s", expr.opToken.Val), expr.opToken)

template_tests/if.tpl

@@ -6,6 +6,8 @@
 {% if !simple.uint %}false{% else %}!simple.uint{% endif %}
 {% if !simple.float %}false{% else %}!simple.float{% endif %}
 {% if "Text" in complex.post %}text field in complex.post{% endif %}
+Hello string {% if not "Hello" in complex.post.Text %}is not{% else %}is{% endif %} in complex.post.Text
+World string {% if not "World" in complex.post.Text %}is not{% else %}is{% endif %} in complex.post.Text
 {% if 5 in simple.intmap %}5 in simple.intmap{% endif %}
 {% if !0.0 %}!0.0{% endif %}
 {% if !0 %}!0{% endif %}

template_tests/if.tpl.out

@@ -6,6 +6,8 @@ float != 0.0
 !simple.uint
 !simple.float
 text field in complex.post
+Hello string is in complex.post.Text
+World string is not in complex.post.Text
 5 in simple.intmap
 !0.0
 !0