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/*
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();
}
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);
}
/**
* 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;
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;
}
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