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authortpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-01-09 06:41:55 +0000
committertpearson <tpearson@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2010-01-09 06:41:55 +0000
commit8bec1dda934fa75cbb1402c58cb879b23305dc40 (patch)
treeb4294963397117f1cf022e7a62452697df996de3 /src/result.h
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Add abakus
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/applications/abakus@1071969 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+#ifndef ABAKUS_RESULT_H
+#define ABAKUS_RESULT_H
+/*
+ * result.h - part of abakus
+ * Copyright (C) 2004, 2005 Michael Pyne <michael.pyne@kdemail.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02110-1301 USA
+ */
+
+#include <qstring.h>
+
+#include "node.h"
+#include "sharedptr.h"
+
+/**
+ * A conceptual result from an expression parse. Used to determine if the
+ * parse succeeded or failed. If it succeeded it will have a node value you
+ * can query as the answer.
+ */
+class Result
+{
+public:
+ typedef enum { Error, Null, Value } Type;
+
+ /**
+ * Default constructor, which constructs a "failed" Result.
+ */
+ Result(const QString &message = "");
+
+ /**
+ * Node constructor, which constructs a "succeeded" result.
+ */
+ Result(NodePtr node);
+
+ /**
+ * Constructor, constructs a "null" result. This means that the
+ * operation was successful, but did not result in a normal value.
+ */
+ Result(Type type);
+
+ bool failed() const { return m_type == Error; }
+
+ Type type() const { return m_type; }
+
+ QString message() const { return m_message; }
+
+ const NodePtr result() const { return m_node; }
+ NodePtr result() { return m_node; }
+
+ static Result *lastResult() { return m_lastResult; }
+ static void setLastResult(const Result &result)
+ {
+ *m_lastResult = result;
+ }
+
+private:
+ NodePtr m_node;
+ Type m_type;
+ QString m_message;
+ static Result *m_lastResult;
+};
+
+#endif /* ABAKUS_RESULT_H */
+
+// vim: set et ts=8 sw=4: