Derive NodeMetadata from Metadata

1 files changed, 69 insertions, 0 deletions

diff --git a/src/metadata.cpp b/src/metadata.cpp
new file mode 100644
index 000000000..8e04aa2d3
--- /dev/null
+++ b/src/metadata.cpp
@@ -0,0 +1,69 @@
+/*
+Minetest
+Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "metadata.h"
+#include "exceptions.h"
+#include "gamedef.h"
+#include "log.h"
+#include <sstream>
+
+/*
+	Metadata
+*/
+
+void Metadata::clear()
+{
+	m_stringvars.clear();
+}
+
+bool Metadata::empty() const
+{
+	return m_stringvars.size() == 0;
+}
+
+std::string Metadata::getString(const std::string &name,
+	u16 recursion) const
+{
+	StringMap::const_iterator it = m_stringvars.find(name);
+	if (it == m_stringvars.end())
+		return "";
+
+	return resolveString(it->second, recursion);
+}
+
+void Metadata::setString(const std::string &name, const std::string &var)
+{
+	if (var.empty()) {
+		m_stringvars.erase(name);
+	} else {
+		m_stringvars[name] = var;
+	}
+}
+
+std::string Metadata::resolveString(const std::string &str,
+	u16 recursion) const
+{
+	if (recursion > 1) {
+		return str;
+	}
+	if (str.substr(0, 2) == "${" && str[str.length() - 1] == '}') {
+		return getString(str.substr(2, str.length() - 3), recursion + 1);
+	}
+	return str;
+}