From ae5f454bfce236623feafe8561346e9ea5d8f3c8 Mon Sep 17 00:00:00 2001
From: Jan Steemann <jan@arangodb.com>
Date: Fri, 19 Sep 2014 17:46:36 +0200
Subject: [PATCH] added unary operator

---
 arangod/Aql/AstNode.cpp    |  4 ++++
 arangod/Aql/Expression.cpp | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/arangod/Aql/AstNode.cpp b/arangod/Aql/AstNode.cpp
index f041d254aa..35c7f9e4f9 100644
--- a/arangod/Aql/AstNode.cpp
+++ b/arangod/Aql/AstNode.cpp
@@ -664,6 +664,10 @@ bool AstNode::isSimple () const {
     return (getMember(0)->isSimple() && getMember(1)->isSimple()); 
   }
   
+  if (type == NODE_TYPE_OPERATOR_UNARY_NOT) {
+    return getMember(0)->isSimple(); 
+  }
+  
   if (type == NODE_TYPE_FCALL) {
     // some functions have C++ handlers
     // check if the called function is one of them
diff --git a/arangod/Aql/Expression.cpp b/arangod/Aql/Expression.cpp
index d75482b209..c01a8688fb 100644
--- a/arangod/Aql/Expression.cpp
+++ b/arangod/Aql/Expression.cpp
@@ -404,6 +404,22 @@ AqlValue Expression::executeSimpleExpression (AstNode const* node,
     return res;
   }
   
+  else if (node->type == NODE_TYPE_OPERATOR_UNARY_NOT) {
+    TRI_document_collection_t const* myCollection = nullptr;
+    AqlValue operand = executeSimpleExpression(node->getMember(0), &myCollection, trx, docColls, argv, startPos, vars, regs);
+    
+    bool operandIsBoolean = operand.isBoolean();
+    bool operandIsTrue    = operand.isTrue();
+      
+    operand.destroy();
+
+    if (! operandIsBoolean) {
+      THROW_ARANGO_EXCEPTION(TRI_ERROR_QUERY_INVALID_LOGICAL_VALUE);
+    }
+
+    return AqlValue(new triagens::basics::Json(! operandIsTrue));
+  }
+  
   else if (node->type == NODE_TYPE_OPERATOR_BINARY_AND ||
            node->type == NODE_TYPE_OPERATOR_BINARY_OR) {
     TRI_document_collection_t const* leftCollection = nullptr;