1 files changed, 115 insertions, 0 deletions
diff --git a/Client/Source/metadata.cpp b/Client/Source/metadata.cpp
new file mode 100644
index 0000000..453ac1c
--- /dev/null
+++ b/Client/Source/metadata.cpp
@@ -0,0 +1,115 @@
+/*
+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 "log.h"
+
+/*
+	Metadata
+*/
+
+void Metadata::clear()
+{
+	m_stringvars.clear();
+	m_modified = true;
+}
+
+bool Metadata::empty() const
+{
+	return m_stringvars.empty();
+}
+
+size_t Metadata::size() const
+{
+	return m_stringvars.size();
+}
+
+bool Metadata::contains(const std::string &name) const
+{
+	return m_stringvars.find(name) != m_stringvars.end();
+}
+
+bool Metadata::operator==(const Metadata &other) const
+{
+	if (size() != other.size())
+		return false;
+
+	for (const auto &sv : m_stringvars) {
+		if (!other.contains(sv.first) || other.getString(sv.first) != sv.second)
+			return false;
+	}
+
+	return true;
+}
+
+const std::string &Metadata::getString(const std::string &name, u16 recursion) const
+{
+	StringMap::const_iterator it = m_stringvars.find(name);
+	if (it == m_stringvars.end()) {
+		static const std::string empty_string = std::string("");
+		return empty_string;
+	}
+
+	return resolveString(it->second, recursion);
+}
+
+bool Metadata::getStringToRef(
+		const std::string &name, std::string &str, u16 recursion) const
+{
+	StringMap::const_iterator it = m_stringvars.find(name);
+	if (it == m_stringvars.end()) {
+		return false;
+	}
+
+	str = resolveString(it->second, recursion);
+	return true;
+}
+
+/**
+ * Sets var to name key in the metadata storage
+ *
+ * @param name
+ * @param var
+ * @return true if key-value pair is created or changed
+ */
+bool Metadata::setString(const std::string &name, const std::string &var)
+{
+	if (var.empty()) {
+		m_stringvars.erase(name);
+		return true;
+	}
+
+	StringMap::iterator it = m_stringvars.find(name);
+	if (it != m_stringvars.end() && it->second == var) {
+		return false;
+	}
+
+	m_stringvars[name] = var;
+	m_modified = true;
+	return true;
+}
+
+const std::string &Metadata::resolveString(const std::string &str, u16 recursion) const
+{
+	if (recursion <= 1 && str.substr(0, 2) == "${" && str[str.length() - 1] == '}') {
+		return getString(str.substr(2, str.length() - 3), recursion + 1);
+	}
+
+	return str;
+}