minetest/src/itemstackmetadata.cpp

#include "itemstackmetadata.h"
#include "util/serialize.h"
#include "util/strfnd.h"

#define DESERIALIZE_START '\x01'
#define DESERIALIZE_KV_DELIM '\x02'
#define DESERIALIZE_PAIR_DELIM '\x03'
#define DESERIALIZE_START_STR "\x01"
#define DESERIALIZE_KV_DELIM_STR "\x02"
#define DESERIALIZE_PAIR_DELIM_STR "\x03"

#define TOOLCAP_KEY "tool_capabilities"

void ItemStackMetadata::clear()
{
	Metadata::clear();
	updateToolCapabilities();
}

bool ItemStackMetadata::setString(const std::string &name, const std::string &var)
{
	bool result = Metadata::setString(name, var);
	if (name == TOOLCAP_KEY)
		updateToolCapabilities();
	return result;
}

void ItemStackMetadata::serialize(std::ostream &os) const
{
	std::ostringstream os2;
	os2 << DESERIALIZE_START;
	for (const auto &stringvar : m_stringvars) {
		if (!stringvar.first.empty() || !stringvar.second.empty())
			os2 << stringvar.first << DESERIALIZE_KV_DELIM
				<< stringvar.second << DESERIALIZE_PAIR_DELIM;
	}
	os << serializeJsonStringIfNeeded(os2.str());
}

void ItemStackMetadata::deSerialize(std::istream &is)
{
	std::string in = deSerializeJsonStringIfNeeded(is);

	m_stringvars.clear();

	if (!in.empty()) {
		if (in[0] == DESERIALIZE_START) {
			Strfnd fnd(in);
			fnd.to(1);
			while (!fnd.at_end()) {
				std::string name = fnd.next(DESERIALIZE_KV_DELIM_STR);
				std::string var  = fnd.next(DESERIALIZE_PAIR_DELIM_STR);
				m_stringvars[name] = var;
			}
		} else {
			// BACKWARDS COMPATIBILITY
			m_stringvars[""] = in;
		}
	}
	updateToolCapabilities();
}

void ItemStackMetadata::updateToolCapabilities()
{
	if (contains(TOOLCAP_KEY)) {
		toolcaps_overridden = true;
		toolcaps_override = ToolCapabilities();
		std::istringstream is(getString(TOOLCAP_KEY));
		toolcaps_override.deserializeJson(is);
	} else {
		toolcaps_overridden = false;
	}
}

void ItemStackMetadata::setToolCapabilities(const ToolCapabilities &caps)
{
	std::ostringstream os;
	caps.serializeJson(os);
	setString(TOOLCAP_KEY, os.str());
}

void ItemStackMetadata::clearToolCapabilities()
{
	setString(TOOLCAP_KEY, "");
}