src/itemstackmetadata.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2017-8 rubenwardy <rw@rubenwardy.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20
  21 #include "itemstackmetadata.h"
  22 #include "util/serialize.h"
  23 #include "util/strfnd.h"
  24
  25 #define DESERIALIZE_START '\x01'
  26 #define DESERIALIZE_KV_DELIM '\x02'
  27 #define DESERIALIZE_PAIR_DELIM '\x03'
  28 #define DESERIALIZE_START_STR "\x01"
  29 #define DESERIALIZE_KV_DELIM_STR "\x02"
  30 #define DESERIALIZE_PAIR_DELIM_STR "\x03"
  31
  32 #define TOOLCAP_KEY "tool_capabilities"
  33
  34 void ItemStackMetadata::clear()
  35 {
  36         Metadata::clear();
  37         updateToolCapabilities();
  38 }
  39
  40 bool ItemStackMetadata::setString(const std::string &name, const std::string &var)
  41 {
  42         bool result = Metadata::setString(name, var);
  43         if (name == TOOLCAP_KEY)
  44                 updateToolCapabilities();
  45         return result;
  46 }
  47
  48 void ItemStackMetadata::serialize(std::ostream &os) const
  49 {
  50         std::ostringstream os2;
  51         os2 << DESERIALIZE_START;
  52         for (const auto &stringvar : m_stringvars) {
  53                 if (!stringvar.first.empty() || !stringvar.second.empty())
  54                         os2 << stringvar.first << DESERIALIZE_KV_DELIM
  55                                 << stringvar.second << DESERIALIZE_PAIR_DELIM;
  56         }
  57         os << serializeJsonStringIfNeeded(os2.str());
  58 }
  59
  60 void ItemStackMetadata::deSerialize(std::istream &is)
  61 {
  62         std::string in = deSerializeJsonStringIfNeeded(is);
  63
  64         m_stringvars.clear();
  65
  66         if (!in.empty()) {
  67                 if (in[0] == DESERIALIZE_START) {
  68                         Strfnd fnd(in);
  69                         fnd.to(1);
  70                         while (!fnd.at_end()) {
  71                                 std::string name = fnd.next(DESERIALIZE_KV_DELIM_STR);
  72                                 std::string var  = fnd.next(DESERIALIZE_PAIR_DELIM_STR);
  73                                 m_stringvars[name] = var;
  74                         }
  75                 } else {
  76                         // BACKWARDS COMPATIBILITY
  77                         m_stringvars[""] = in;
  78                 }
  79         }
  80         updateToolCapabilities();
  81 }
  82
  83 void ItemStackMetadata::updateToolCapabilities()
  84 {
  85         if (contains(TOOLCAP_KEY)) {
  86                 toolcaps_overridden = true;
  87                 toolcaps_override = ToolCapabilities();
  88                 std::istringstream is(getString(TOOLCAP_KEY));
  89                 toolcaps_override.deserializeJson(is);
  90         } else {
  91                 toolcaps_overridden = false;
  92         }
  93 }
  94
  95 void ItemStackMetadata::setToolCapabilities(const ToolCapabilities &caps)
  96 {
  97         std::ostringstream os;
  98         caps.serializeJson(os);
  99         setString(TOOLCAP_KEY, os.str());
 100 }
 101
 102 void ItemStackMetadata::clearToolCapabilities()
 103 {
 104         setString(TOOLCAP_KEY, "");
 105 }