minetest/src/script/lua_api/l_metadata.cpp

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2017-01-31 17:43:45 +01:00
/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
Copyright (C) 2017-8 rubenwardy <rw@rubenwardy.com>
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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 "lua_api/l_metadata.h"
#include "lua_api/l_internal.h"
#include "common/c_content.h"
#include "serverenvironment.h"
#include "map.h"
#include "server.h"
// LUALIB_API
void *luaL_checkudata_is_metadataref(lua_State *L, int ud) {
void *p = lua_touserdata(L, ud);
if (p != NULL && // value is a userdata?
lua_getmetatable(L, ud)) { // does it have a metatable?
lua_getfield(L, -1, "metadata_class");
if (lua_type(L, -1) == LUA_TSTRING) { // does it have a metadata_class field?
return p;
}
}
luaL_typerror(L, ud, "MetaDataRef");
return NULL;
}
MetaDataRef* MetaDataRef::checkobject(lua_State *L, int narg)
{
luaL_checktype(L, narg, LUA_TUSERDATA);
void *ud = luaL_checkudata_is_metadataref(L, narg);
if (!ud)
luaL_typerror(L, narg, "MetaDataRef");
return *(MetaDataRef**)ud; // unbox pointer
}
// Exported functions
// get_string(self, name)
int MetaDataRef::l_get_string(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
Metadata *meta = ref->getmeta(false);
if (meta == NULL) {
lua_pushlstring(L, "", 0);
return 1;
}
const std::string &str = meta->getString(name);
lua_pushlstring(L, str.c_str(), str.size());
return 1;
}
// set_string(self, name, var)
int MetaDataRef::l_set_string(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
size_t len = 0;
const char *s = lua_tolstring(L, 3, &len);
std::string str(s, len);
Metadata *meta = ref->getmeta(!str.empty());
if (meta == NULL || str == meta->getString(name))
return 0;
meta->setString(name, str);
ref->reportMetadataChange();
return 0;
}
// get_int(self, name)
int MetaDataRef::l_get_int(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
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Metadata *meta = ref->getmeta(false);
if (meta == NULL) {
lua_pushnumber(L, 0);
return 1;
}
const std::string &str = meta->getString(name);
lua_pushnumber(L, stoi(str));
return 1;
}
// set_int(self, name, var)
int MetaDataRef::l_set_int(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
int a = luaL_checkint(L, 3);
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std::string str = itos(a);
Metadata *meta = ref->getmeta(true);
if (meta == NULL || str == meta->getString(name))
return 0;
meta->setString(name, str);
ref->reportMetadataChange();
return 0;
}
// get_float(self, name)
int MetaDataRef::l_get_float(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
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Metadata *meta = ref->getmeta(false);
if (meta == NULL) {
lua_pushnumber(L, 0);
return 1;
}
const std::string &str = meta->getString(name);
lua_pushnumber(L, stof(str));
return 1;
}
// set_float(self, name, var)
int MetaDataRef::l_set_float(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
std::string name = luaL_checkstring(L, 2);
float a = luaL_checknumber(L, 3);
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std::string str = ftos(a);
Metadata *meta = ref->getmeta(true);
if (meta == NULL || str == meta->getString(name))
return 0;
meta->setString(name, str);
ref->reportMetadataChange();
return 0;
}
// to_table(self)
int MetaDataRef::l_to_table(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
Metadata *meta = ref->getmeta(true);
if (meta == NULL) {
lua_pushnil(L);
return 1;
}
lua_newtable(L);
ref->handleToTable(L, meta);
return 1;
}
// from_table(self, table)
int MetaDataRef::l_from_table(lua_State *L)
{
MAP_LOCK_REQUIRED;
MetaDataRef *ref = checkobject(L, 1);
int base = 2;
ref->clearMeta();
if (!lua_istable(L, base)) {
// No metadata
lua_pushboolean(L, true);
return 1;
}
// Create new metadata
Metadata *meta = ref->getmeta(true);
if (meta == NULL) {
lua_pushboolean(L, false);
return 1;
}
bool was_successful = ref->handleFromTable(L, base, meta);
ref->reportMetadataChange();
lua_pushboolean(L, was_successful);
return 1;
}
void MetaDataRef::handleToTable(lua_State *L, Metadata *meta)
{
lua_newtable(L);
{
const StringMap &fields = meta->getStrings();
for (const auto &field : fields) {
const std::string &name = field.first;
const std::string &value = field.second;
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lua_pushlstring(L, name.c_str(), name.size());
lua_pushlstring(L, value.c_str(), value.size());
lua_settable(L, -3);
}
}
lua_setfield(L, -2, "fields");
}
bool MetaDataRef::handleFromTable(lua_State *L, int table, Metadata *meta)
{
// Set fields
lua_getfield(L, table, "fields");
if (lua_istable(L, -1)) {
int fieldstable = lua_gettop(L);
lua_pushnil(L);
while (lua_next(L, fieldstable) != 0) {
// key at index -2 and value at index -1
std::string name = lua_tostring(L, -2);
size_t cl;
const char *cs = lua_tolstring(L, -1, &cl);
meta->setString(name, std::string(cs, cl));
lua_pop(L, 1); // Remove value, keep key for next iteration
}
lua_pop(L, 1);
}
return true;
}
// equals(self, other)
int MetaDataRef::l_equals(lua_State *L)
{
MetaDataRef *ref1 = checkobject(L, 1);
Metadata *data1 = ref1->getmeta(false);
MetaDataRef *ref2 = checkobject(L, 2);
Metadata *data2 = ref2->getmeta(false);
if (data1 == NULL || data2 == NULL)
lua_pushboolean(L, data1 == data2);
else
lua_pushboolean(L, *data1 == *data2);
return 1;
}