Adds support for RunTimeString

Using RunTimeStrings instead of runtime parser for
macro expansion.

src/run_time_string.h

@@ -0,0 +1,58 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+
+#include <ctime>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include "modsecurity/modsecurity.h"
+#include "modsecurity/transaction.h"
+#include "src/variables/variable.h"
+
+#ifndef SRC_RUN_TIME_STRING_H_
+#define SRC_RUN_TIME_STRING_H_
+
+namespace modsecurity {
+
+class RunTimeElementHolder {
+ public:
+    RunTimeElementHolder() :
+        m_string("") {
+            m_var.reset(NULL);
+        };
+    std::unique_ptr<modsecurity::Variables::Variable> m_var;
+    std::string m_string;
+};
+
+class RunTimeString {
+ public:
+    RunTimeString() {
+    };
+    void appendText(std::string &text);
+    void appendVar(std::unique_ptr<modsecurity::Variables::Variable> var);
+    std::string evaluate(Transaction *t);
+
+ protected:
+    std::list<std::unique_ptr<RunTimeElementHolder>> m_elements;
+};
+
+
+}  // namespace modsecurity
+
+
+
+#endif  // SRC_RUN_TIME_STRING_H_