Prioritise craft recipes
[oweals/minetest.git] / src / craftdef.cpp
index 6fc0ae934cc11e44a050da6245ebc0925f0cd131..9482fce6a9a7f1953611828a1b1ed2a6dd00d987 100644 (file)
@@ -29,7 +29,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/serialize.h"
 #include "util/string.h"
 #include "util/numeric.h"
-#include "strfnd.h"
+#include "util/strfnd.h"
 #include "exceptions.h"
 
 inline bool isGroupRecipeStr(const std::string &rec_name)
@@ -49,17 +49,17 @@ static u64 getHashForGrid(CraftHashType type, const std::vector<std::string> &gr
                case CRAFT_HASH_TYPE_ITEM_NAMES: {
                        std::ostringstream os;
                        bool is_first = true;
-                       for (size_t i = 0; i < grid_names.size(); i++) {
-                               if (grid_names[i] != "") {
-                                       os << (is_first ? "" : "\n") << grid_names[i];
+                       for (const std::string &grid_name : grid_names) {
+                               if (!grid_name.empty()) {
+                                       os << (is_first ? "" : "\n") << grid_name;
                                        is_first = false;
                                }
                        }
                        return getHashForString(os.str());
                } case CRAFT_HASH_TYPE_COUNT: {
                        u64 cnt = 0;
-                       for (size_t i = 0; i < grid_names.size(); i++)
-                               if (grid_names[i] != "")
+                       for (const std::string &grid_name : grid_names)
+                               if (!grid_name.empty())
                                        cnt++;
                        return cnt;
                } case CRAFT_HASH_TYPE_UNHASHED:
@@ -67,6 +67,7 @@ static u64 getHashForGrid(CraftHashType type, const std::vector<std::string> &gr
        }
        // invalid CraftHashType
        assert(false);
+       return 0;
 }
 
 // Check if input matches recipe
@@ -89,7 +90,7 @@ static bool inputItemMatchesRecipe(const std::string &inp_name,
                                all_groups_match = false;
                                break;
                        }
-               } while (!f.atend());
+               } while (!f.at_end());
                if (all_groups_match)
                        return true;
        }
@@ -111,10 +112,9 @@ static std::vector<std::string> craftGetItemNames(
                const std::vector<std::string> &itemstrings, IGameDef *gamedef)
 {
        std::vector<std::string> result;
-       for (std::vector<std::string>::const_iterator
-                       it = itemstrings.begin();
-                       it != itemstrings.end(); it++) {
-               result.push_back(craftGetItemName(*it, gamedef));
+       result.reserve(itemstrings.size());
+       for (const auto &itemstring : itemstrings) {
+               result.push_back(craftGetItemName(itemstring, gamedef));
        }
        return result;
 }
@@ -124,10 +124,9 @@ static std::vector<std::string> craftGetItemNames(
                const std::vector<ItemStack> &items, IGameDef *gamedef)
 {
        std::vector<std::string> result;
-       for (std::vector<ItemStack>::const_iterator
-                       it = items.begin();
-                       it != items.end(); it++) {
-               result.push_back(it->name);
+       result.reserve(items.size());
+       for (const auto &item : items) {
+               result.push_back(item.name);
        }
        return result;
 }
@@ -137,11 +136,10 @@ static std::vector<ItemStack> craftGetItems(
                const std::vector<std::string> &items, IGameDef *gamedef)
 {
        std::vector<ItemStack> result;
-       for (std::vector<std::string>::const_iterator
-                       it = items.begin();
-                       it != items.end(); it++) {
-               result.push_back(ItemStack(std::string(*it), (u16)1,
-                       (u16)0, "", gamedef->getItemDefManager()));
+       result.reserve(items.size());
+       for (const auto &item : items) {
+               result.emplace_back(std::string(item), (u16)1,
+                       (u16)0, gamedef->getItemDefManager());
        }
        return result;
 }
@@ -155,11 +153,9 @@ static bool craftGetBounds(const std::vector<std::string> &items, unsigned int w
        bool success = false;
        unsigned int x = 0;
        unsigned int y = 0;
-       for (std::vector<std::string>::const_iterator
-                       it = items.begin();
-                       it != items.end(); it++) {
+       for (const std::string &item : items) {
                // Is this an actual item?
-               if (*it != "") {
+               if (!item.empty()) {
                        if (!success) {
                                // This is the first nonempty item
                                min_x = max_x = x;
@@ -186,11 +182,9 @@ static bool craftGetBounds(const std::vector<std::string> &items, unsigned int w
 // Removes 1 from each item stack
 static void craftDecrementInput(CraftInput &input, IGameDef *gamedef)
 {
-       for (std::vector<ItemStack>::iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (it->count != 0)
-                       it->remove(1);
+       for (auto &item : input.items) {
+               if (item.count != 0)
+                       item.remove(1);
        }
 }
 
@@ -198,6 +192,7 @@ static void craftDecrementInput(CraftInput &input, IGameDef *gamedef)
 // Example: if replacements contains the pair ("bucket:bucket_water", "bucket:bucket_empty"),
 //   a water bucket will not be removed but replaced by an empty bucket.
 static void craftDecrementOrReplaceInput(CraftInput &input,
+               std::vector<ItemStack> &output_replacements,
                const CraftReplacements &replacements,
                IGameDef *gamedef)
 {
@@ -209,29 +204,30 @@ static void craftDecrementOrReplaceInput(CraftInput &input,
        // Make a copy of the replacements pair list
        std::vector<std::pair<std::string, std::string> > pairs = replacements.pairs;
 
-       for (std::vector<ItemStack>::iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (it->count == 1) {
-                       // Find an appropriate replacement
-                       bool found_replacement = false;
-                       for (std::vector<std::pair<std::string, std::string> >::iterator
-                                       j = pairs.begin();
-                                       j != pairs.end(); j++) {
-                               if (it->name == craftGetItemName(j->first, gamedef)) {
-                                       it->deSerialize(j->second, gamedef->idef());
+       for (auto &item : input.items) {
+               // Find an appropriate replacement
+               bool found_replacement = false;
+               for (auto j = pairs.begin(); j != pairs.end(); ++j) {
+                       if (inputItemMatchesRecipe(item.name, j->first, gamedef->idef())) {
+                               if (item.count == 1) {
+                                       item.deSerialize(j->second, gamedef->idef());
                                        found_replacement = true;
                                        pairs.erase(j);
                                        break;
                                }
+
+                               ItemStack rep;
+                               rep.deSerialize(j->second, gamedef->idef());
+                               item.remove(1);
+                               found_replacement = true;
+                               output_replacements.push_back(rep);
+                               break;
+
                        }
-                       // No replacement was found, simply decrement count to zero
-                       if (!found_replacement)
-                               it->remove(1);
-               } else if (it->count >= 2) {
-                       // Ignore replacements for items with count >= 2
-                       it->remove(1);
                }
+               // No replacement was found, simply decrement count by one
+               if (!found_replacement && item.count > 0)
+                       item.remove(1);
        }
 }
 
@@ -240,18 +236,17 @@ static std::string craftDumpMatrix(const std::vector<std::string> &items,
                unsigned int width)
 {
        std::ostringstream os(std::ios::binary);
-       os<<"{ ";
+       os << "{ ";
        unsigned int x = 0;
-       for(std::vector<std::string>::const_iterator
-                       it = items.begin();
-                       it != items.end(); it++, x++) {
+       for(std::vector<std::string>::size_type i = 0;
+                       i < items.size(); i++, x++) {
                if (x == width) {
-                       os<<"; ";
+                       os << "; ";
                        x = 0;
                } else if (x != 0) {
-                       os<<",";
+                       os << ",";
                }
-               os << '"' << (*it) << '"';
+               os << '"' << items[i] << '"';
        }
        os << " }";
        return os.str();
@@ -264,16 +259,15 @@ std::string craftDumpMatrix(const std::vector<ItemStack> &items,
        std::ostringstream os(std::ios::binary);
        os << "{ ";
        unsigned int x = 0;
-       for (std::vector<ItemStack>::const_iterator
-                       it = items.begin();
-                       it != items.end(); it++, x++) {
+       for (std::vector<ItemStack>::size_type i = 0;
+                       i < items.size(); i++, x++) {
                if (x == width) {
                        os << "; ";
                        x = 0;
                } else if (x != 0) {
-                       os<<",";
+                       os << ",";
                }
-               os << '"' << (it->getItemString()) << '"';
+               os << '"' << (items[i].getItemString()) << '"';
        }
        os << " }";
        return os.str();
@@ -312,10 +306,10 @@ std::string CraftReplacements::dump() const
        std::ostringstream os(std::ios::binary);
        os<<"{";
        const char *sep = "";
-       for (std::vector<std::pair<std::string, std::string> >::const_iterator
-                       it = pairs.begin();
-                       it != pairs.end(); it++) {
-               os << sep << '"' << (it->first) << "\"=>\"" << (it->second) << '"';
+       for (const auto &repl_p : pairs) {
+               os << sep
+                       << '"' << (repl_p.first)
+                       << "\"=>\"" << (repl_p.second) << '"';
                sep = ",";
        }
        os << "}";
@@ -342,7 +336,7 @@ bool CraftDefinitionShaped::check(const CraftInput &input, IGameDef *gamedef) co
        if (inp_width == 0)
                return false;
        while (inp_names.size() % inp_width != 0)
-               inp_names.push_back("");
+               inp_names.emplace_back("");
 
        // Get input bounds
        unsigned int inp_min_x = 0, inp_max_x = 0, inp_min_y = 0, inp_max_y = 0;
@@ -361,7 +355,7 @@ bool CraftDefinitionShaped::check(const CraftInput &input, IGameDef *gamedef) co
        if (rec_width == 0)
                return false;
        while (rec_names.size() % rec_width != 0)
-               rec_names.push_back("");
+               rec_names.emplace_back("");
 
        // Get recipe bounds
        unsigned int rec_min_x=0, rec_max_x=0, rec_min_y=0, rec_max_y=0;
@@ -407,25 +401,10 @@ CraftInput CraftDefinitionShaped::getInput(const CraftOutput &output, IGameDef *
        return CraftInput(CRAFT_METHOD_NORMAL,width,craftGetItems(recipe,gamedef));
 }
 
-void CraftDefinitionShaped::decrementInput(CraftInput &input, IGameDef *gamedef) const
+void CraftDefinitionShaped::decrementInput(CraftInput &input, std::vector<ItemStack> &output_replacements,
+        IGameDef *gamedef) const
 {
-       craftDecrementOrReplaceInput(input, replacements, gamedef);
-}
-
-CraftHashType CraftDefinitionShaped::getHashType() const
-{
-       assert(hash_inited); // Pre-condition
-       bool has_group = false;
-       for (size_t i = 0; i < recipe_names.size(); i++) {
-               if (isGroupRecipeStr(recipe_names[i])) {
-                       has_group = true;
-                       break;
-               }
-       }
-       if (has_group)
-               return CRAFT_HASH_TYPE_COUNT;
-       else
-               return CRAFT_HASH_TYPE_ITEM_NAMES;
+       craftDecrementOrReplaceInput(input, output_replacements, replacements, gamedef);
 }
 
 u64 CraftDefinitionShaped::getHash(CraftHashType type) const
@@ -445,6 +424,21 @@ void CraftDefinitionShaped::initHash(IGameDef *gamedef)
                return;
        hash_inited = true;
        recipe_names = craftGetItemNames(recipe, gamedef);
+
+       bool has_group = false;
+       for (const auto &recipe_name : recipe_names) {
+               if (isGroupRecipeStr(recipe_name)) {
+                       has_group = true;
+                       break;
+               }
+       }
+       if (has_group) {
+               hash_type = CRAFT_HASH_TYPE_COUNT;
+               priority = SHAPED_AND_GROUPS;
+       } else {
+               hash_type = CRAFT_HASH_TYPE_ITEM_NAMES;
+               priority = SHAPED;
+       }
 }
 
 std::string CraftDefinitionShaped::dump() const
@@ -472,11 +466,9 @@ bool CraftDefinitionShapeless::check(const CraftInput &input, IGameDef *gamedef)
 
        // Filter empty items out of input
        std::vector<std::string> input_filtered;
-       for (std::vector<ItemStack>::const_iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (it->name != "")
-                       input_filtered.push_back(it->name);
+       for (const auto &item : input.items) {
+               if (!item.name.empty())
+                       input_filtered.push_back(item.name);
        }
 
        // If there is a wrong number of items in input, no match
@@ -528,25 +520,10 @@ CraftInput CraftDefinitionShapeless::getInput(const CraftOutput &output, IGameDe
        return CraftInput(CRAFT_METHOD_NORMAL, 0, craftGetItems(recipe, gamedef));
 }
 
-void CraftDefinitionShapeless::decrementInput(CraftInput &input, IGameDef *gamedef) const
-{
-       craftDecrementOrReplaceInput(input, replacements, gamedef);
-}
-
-CraftHashType CraftDefinitionShapeless::getHashType() const
+void CraftDefinitionShapeless::decrementInput(CraftInput &input, std::vector<ItemStack> &output_replacements,
+       IGameDef *gamedef) const
 {
-       assert(hash_inited); // Pre-condition
-       bool has_group = false;
-       for (size_t i = 0; i < recipe_names.size(); i++) {
-               if (isGroupRecipeStr(recipe_names[i])) {
-                       has_group = true;
-                       break;
-               }
-       }
-       if (has_group)
-               return CRAFT_HASH_TYPE_COUNT;
-       else
-               return CRAFT_HASH_TYPE_ITEM_NAMES;
+       craftDecrementOrReplaceInput(input, output_replacements, replacements, gamedef);
 }
 
 u64 CraftDefinitionShapeless::getHash(CraftHashType type) const
@@ -564,6 +541,21 @@ void CraftDefinitionShapeless::initHash(IGameDef *gamedef)
        hash_inited = true;
        recipe_names = craftGetItemNames(recipe, gamedef);
        std::sort(recipe_names.begin(), recipe_names.end());
+
+       bool has_group = false;
+       for (const auto &recipe_name : recipe_names) {
+               if (isGroupRecipeStr(recipe_name)) {
+                       has_group = true;
+                       break;
+               }
+       }
+       if (has_group) {
+               hash_type = CRAFT_HASH_TYPE_COUNT;
+               priority = SHAPELESS_AND_GROUPS;
+       } else {
+               hash_type = CRAFT_HASH_TYPE_ITEM_NAMES;
+               priority = SHAPELESS;
+       }
 }
 
 std::string CraftDefinitionShapeless::dump() const
@@ -588,7 +580,7 @@ static ItemStack craftToolRepair(
        IItemDefManager *idef = gamedef->idef();
        if (item1.count != 1 || item2.count != 1 || item1.name != item2.name
                        || idef->get(item1.name).type != ITEM_TOOL
-                       || idef->get(item2.name).type != ITEM_TOOL) {
+                       || itemgroup_get(idef->get(item1.name).groups, "disable_repair") == 1) {
                // Failure
                return ItemStack();
        }
@@ -619,14 +611,12 @@ bool CraftDefinitionToolRepair::check(const CraftInput &input, IGameDef *gamedef
 
        ItemStack item1;
        ItemStack item2;
-       for (std::vector<ItemStack>::const_iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (!it->empty()) {
+       for (const auto &item : input.items) {
+               if (!item.empty()) {
                        if (item1.empty())
-                               item1 = *it;
+                               item1 = item;
                        else if (item2.empty())
-                               item2 = *it;
+                               item2 = item;
                        else
                                return false;
                }
@@ -639,14 +629,12 @@ CraftOutput CraftDefinitionToolRepair::getOutput(const CraftInput &input, IGameD
 {
        ItemStack item1;
        ItemStack item2;
-       for (std::vector<ItemStack>::const_iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (!it->empty()) {
+       for (const auto &item : input.items) {
+               if (!item.empty()) {
                        if (item1.empty())
-                               item1 = *it;
+                               item1 = item;
                        else if (item2.empty())
-                               item2 = *it;
+                               item2 = item;
                }
        }
        ItemStack repaired = craftToolRepair(item1, item2, additional_wear, gamedef);
@@ -656,11 +644,12 @@ CraftOutput CraftDefinitionToolRepair::getOutput(const CraftInput &input, IGameD
 CraftInput CraftDefinitionToolRepair::getInput(const CraftOutput &output, IGameDef *gamedef) const
 {
        std::vector<ItemStack> stack;
-       stack.push_back(ItemStack());
+       stack.emplace_back();
        return CraftInput(CRAFT_METHOD_COOKING, additional_wear, stack);
 }
 
-void CraftDefinitionToolRepair::decrementInput(CraftInput &input, IGameDef *gamedef) const
+void CraftDefinitionToolRepair::decrementInput(CraftInput &input, std::vector<ItemStack> &output_replacements,
+       IGameDef *gamedef) const
 {
        craftDecrementInput(input, gamedef);
 }
@@ -688,11 +677,10 @@ bool CraftDefinitionCooking::check(const CraftInput &input, IGameDef *gamedef) c
 
        // Filter empty items out of input
        std::vector<std::string> input_filtered;
-       for (std::vector<ItemStack>::const_iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (it->name != "")
-                       input_filtered.push_back(it->name);
+       for (const auto &item : input.items) {
+               const std::string &name = item.name;
+               if (!name.empty())
+                       input_filtered.push_back(name);
        }
 
        // If there is a wrong number of items in input, no match
@@ -719,30 +707,25 @@ CraftInput CraftDefinitionCooking::getInput(const CraftOutput &output, IGameDef
        return CraftInput(CRAFT_METHOD_COOKING,cooktime,craftGetItems(rec,gamedef));
 }
 
-void CraftDefinitionCooking::decrementInput(CraftInput &input, IGameDef *gamedef) const
+void CraftDefinitionCooking::decrementInput(CraftInput &input, std::vector<ItemStack> &output_replacements,
+       IGameDef *gamedef) const
 {
-       craftDecrementOrReplaceInput(input, replacements, gamedef);
-}
-
-CraftHashType CraftDefinitionCooking::getHashType() const
-{
-       if (isGroupRecipeStr(recipe_name))
-               return CRAFT_HASH_TYPE_COUNT;
-       else
-               return CRAFT_HASH_TYPE_ITEM_NAMES;
+       craftDecrementOrReplaceInput(input, output_replacements, replacements, gamedef);
 }
 
 u64 CraftDefinitionCooking::getHash(CraftHashType type) const
 {
        if (type == CRAFT_HASH_TYPE_ITEM_NAMES) {
                return getHashForString(recipe_name);
-       } else if (type == CRAFT_HASH_TYPE_COUNT) {
+       }
+
+       if (type == CRAFT_HASH_TYPE_COUNT) {
                return 1;
-       } else {
-               //illegal hash type for this CraftDefinition (pre-condition)
-               assert(false);
-               return 0;
        }
+
+       // illegal hash type for this CraftDefinition (pre-condition)
+       assert(false);
+       return 0;
 }
 
 void CraftDefinitionCooking::initHash(IGameDef *gamedef)
@@ -751,6 +734,14 @@ void CraftDefinitionCooking::initHash(IGameDef *gamedef)
                return;
        hash_inited = true;
        recipe_name = craftGetItemName(recipe, gamedef);
+
+       if (isGroupRecipeStr(recipe_name)) {
+               hash_type = CRAFT_HASH_TYPE_COUNT;
+               priority = SHAPELESS_AND_GROUPS;
+       } else {
+               hash_type = CRAFT_HASH_TYPE_ITEM_NAMES;
+               priority = SHAPELESS;
+       }
 }
 
 std::string CraftDefinitionCooking::dump() const
@@ -779,11 +770,10 @@ bool CraftDefinitionFuel::check(const CraftInput &input, IGameDef *gamedef) cons
 
        // Filter empty items out of input
        std::vector<std::string> input_filtered;
-       for (std::vector<ItemStack>::const_iterator
-                       it = input.items.begin();
-                       it != input.items.end(); it++) {
-               if (it->name != "")
-                       input_filtered.push_back(it->name);
+       for (const auto &item : input.items) {
+               const std::string &name = item.name;
+               if (!name.empty())
+                       input_filtered.push_back(name);
        }
 
        // If there is a wrong number of items in input, no match
@@ -810,30 +800,25 @@ CraftInput CraftDefinitionFuel::getInput(const CraftOutput &output, IGameDef *ga
        return CraftInput(CRAFT_METHOD_COOKING,(int)burntime,craftGetItems(rec,gamedef));
 }
 
-void CraftDefinitionFuel::decrementInput(CraftInput &input, IGameDef *gamedef) const
+void CraftDefinitionFuel::decrementInput(CraftInput &input, std::vector<ItemStack> &output_replacements,
+       IGameDef *gamedef) const
 {
-       craftDecrementOrReplaceInput(input, replacements, gamedef);
-}
-
-CraftHashType CraftDefinitionFuel::getHashType() const
-{
-       if (isGroupRecipeStr(recipe_name))
-               return CRAFT_HASH_TYPE_COUNT;
-       else
-               return CRAFT_HASH_TYPE_ITEM_NAMES;
+       craftDecrementOrReplaceInput(input, output_replacements, replacements, gamedef);
 }
 
 u64 CraftDefinitionFuel::getHash(CraftHashType type) const
 {
        if (type == CRAFT_HASH_TYPE_ITEM_NAMES) {
                return getHashForString(recipe_name);
-       } else if (type == CRAFT_HASH_TYPE_COUNT) {
+       }
+
+       if (type == CRAFT_HASH_TYPE_COUNT) {
                return 1;
-       } else {
-               //illegal hash type for this CraftDefinition (pre-condition)
-               assert(false);
-               return 0;
        }
+
+       // illegal hash type for this CraftDefinition (pre-condition)
+       assert(false);
+       return 0;
 }
 
 void CraftDefinitionFuel::initHash(IGameDef *gamedef)
@@ -842,7 +827,16 @@ void CraftDefinitionFuel::initHash(IGameDef *gamedef)
                return;
        hash_inited = true;
        recipe_name = craftGetItemName(recipe, gamedef);
+
+       if (isGroupRecipeStr(recipe_name)) {
+               hash_type = CRAFT_HASH_TYPE_COUNT;
+               priority = SHAPELESS_AND_GROUPS;
+       } else {
+               hash_type = CRAFT_HASH_TYPE_ITEM_NAMES;
+               priority = SHAPELESS;
+       }
 }
+
 std::string CraftDefinitionFuel::dump() const
 {
        std::ostringstream os(std::ios::binary);
@@ -870,17 +864,16 @@ public:
        }
 
        virtual bool getCraftResult(CraftInput &input, CraftOutput &output,
-                       bool decrementInput, IGameDef *gamedef) const
+                       std::vector<ItemStack> &output_replacement, bool decrementInput,
+                       IGameDef *gamedef) const
        {
                output.item = "";
                output.time = 0;
 
                // If all input items are empty, abort.
                bool all_empty = true;
-               for (std::vector<ItemStack>::const_iterator
-                               it = input.items.begin();
-                               it != input.items.end(); it++) {
-                       if (!it->empty()) {
+               for (const auto &item : input.items) {
+                       if (!item.empty()) {
                                all_empty = false;
                                break;
                        }
@@ -892,7 +885,11 @@ public:
                input_names = craftGetItemNames(input.items, gamedef);
                std::sort(input_names.begin(), input_names.end());
 
-               // Try hash types with increasing collision rate, and return if found.
+               // Try hash types with increasing collision rate
+               // while remembering the latest, highest priority recipe.
+               CraftDefinition::RecipePriority priority_best =
+                       CraftDefinition::NO_RECIPE;
+               CraftDefinition *def_best = nullptr;
                for (int type = 0; type <= craft_hash_type_max; type++) {
                        u64 hash = getHashForGrid((CraftHashType) type, input_names);
 
@@ -900,8 +897,7 @@ public:
 
                        // We'd like to do "const [...] hash_collisions = m_craft_defs[type][hash];"
                        // but that doesn't compile for some reason. This does.
-                       std::map<u64, std::vector<CraftDefinition*> >::const_iterator
-                               col_iter = (m_craft_defs[type]).find(hash);
+                       auto col_iter = (m_craft_defs[type]).find(hash);
 
                        if (col_iter == (m_craft_defs[type]).end())
                                continue;
@@ -909,25 +905,37 @@ public:
                        const std::vector<CraftDefinition*> &hash_collisions = col_iter->second;
                        // Walk crafting definitions from back to front, so that later
                        // definitions can override earlier ones.
-                       for (std::vector<CraftDefinition*>::const_reverse_iterator
-                                       it = hash_collisions.rbegin();
-                                       it != hash_collisions.rend(); it++) {
-                               CraftDefinition *def = *it;
+                       for (std::vector<CraftDefinition*>::size_type
+                                       i = hash_collisions.size(); i > 0; i--) {
+                               CraftDefinition *def = hash_collisions[i - 1];
 
                                /*errorstream << "Checking " << input.dump() << std::endl
                                        << " against " << def->dump() << std::endl;*/
 
-                               if (def->check(input, gamedef)) {
-                                       // Get output, then decrement input (if requested)
-                                       output = def->getOutput(input, gamedef);
-                                       if (decrementInput)
-                                               def->decrementInput(input, gamedef);
-                                       /*errorstream << "Check RETURNS TRUE" << std::endl;*/
-                                       return true;
+                               CraftDefinition::RecipePriority priority = def->getPriority();
+                               if (priority > priority_best
+                                               && def->check(input, gamedef)) {
+                                       // Check if the crafted node/item exists
+                                       CraftOutput out = def->getOutput(input, gamedef);
+                                       ItemStack is;
+                                       is.deSerialize(out.item, gamedef->idef());
+                                       if (!is.isKnown(gamedef->idef())) {
+                                               infostream << "trying to craft non-existent "
+                                                       << out.item << ", ignoring recipe" << std::endl;
+                                               continue;
+                                       }
+
+                                       output = out;
+                                       priority_best = priority;
+                                       def_best = def;
                                }
                        }
                }
-               return false;
+               if (priority_best == CraftDefinition::NO_RECIPE)
+                       return false;
+               if (decrementInput)
+                       def_best->decrementInput(input, output_replacement, gamedef);
+               return true;
        }
 
        virtual std::vector<CraftDefinition*> getCraftRecipes(CraftOutput &output,
@@ -935,8 +943,7 @@ public:
        {
                std::vector<CraftDefinition*> recipes;
 
-               std::map<std::string, std::vector<CraftDefinition*> >::const_iterator
-                       vec_iter = m_output_craft_definitions.find(output.item);
+               auto vec_iter = m_output_craft_definitions.find(output.item);
 
                if (vec_iter == m_output_craft_definitions.end())
                        return recipes;
@@ -945,26 +952,112 @@ public:
 
                recipes.reserve(limit ? MYMIN(limit, vec.size()) : vec.size());
 
-               for (std::vector<CraftDefinition*>::const_reverse_iterator
-                               it = vec.rbegin(); it != vec.rend(); ++it) {
+               for (std::vector<CraftDefinition*>::size_type i = vec.size();
+                               i > 0; i--) {
+                       CraftDefinition *def = vec[i - 1];
                        if (limit && recipes.size() >= limit)
                                break;
-                       recipes.push_back(*it);
+                       recipes.push_back(def);
                }
 
                return recipes;
        }
+
+       virtual bool clearCraftRecipesByOutput(const CraftOutput &output, IGameDef *gamedef)
+       {
+               auto vec_iter = m_output_craft_definitions.find(output.item);
+
+               if (vec_iter == m_output_craft_definitions.end())
+                       return false;
+
+               std::vector<CraftDefinition*> &vec = vec_iter->second;
+               for (auto def : vec) {
+                       // Recipes are not yet hashed at this point
+                       std::vector<CraftDefinition*> &unhashed_inputs_vec = m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0];
+                       std::vector<CraftDefinition*> new_vec_by_input;
+                       /* We will preallocate necessary memory addresses, so we don't need to reallocate them later.
+                               This would save us some performance. */
+                       new_vec_by_input.reserve(unhashed_inputs_vec.size());
+                       for (auto &i2 : unhashed_inputs_vec) {
+                               if (def != i2) {
+                                       new_vec_by_input.push_back(i2);
+                               }
+                       }
+                       m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0].swap(new_vec_by_input);
+               }
+               m_output_craft_definitions.erase(output.item);
+               return true;
+       }
+
+       virtual bool clearCraftRecipesByInput(CraftMethod craft_method, unsigned int craft_grid_width,
+               const std::vector<std::string> &recipe, IGameDef *gamedef)
+       {
+               bool all_empty = true;
+               for (const auto &i : recipe) {
+                       if (!i.empty()) {
+                               all_empty = false;
+                               break;
+                       }
+               }
+               if (all_empty)
+                       return false;
+
+               CraftInput input(craft_method, craft_grid_width, craftGetItems(recipe, gamedef));
+               // Recipes are not yet hashed at this point
+               std::vector<CraftDefinition*> &unhashed_inputs_vec = m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0];
+               std::vector<CraftDefinition*> new_vec_by_input;
+               bool got_hit = false;
+               for (std::vector<CraftDefinition*>::size_type
+                               i = unhashed_inputs_vec.size(); i > 0; i--) {
+                       CraftDefinition *def = unhashed_inputs_vec[i - 1];
+                       /* If the input doesn't match the recipe definition, this recipe definition later
+                               will be added back in source map. */
+                       if (!def->check(input, gamedef)) {
+                               new_vec_by_input.push_back(def);
+                               continue;
+                       }
+                       CraftOutput output = def->getOutput(input, gamedef);
+                       got_hit = true;
+                       auto vec_iter = m_output_craft_definitions.find(output.item);
+                       if (vec_iter == m_output_craft_definitions.end())
+                               continue;
+                       std::vector<CraftDefinition*> &vec = vec_iter->second;
+                       std::vector<CraftDefinition*> new_vec_by_output;
+                       /* We will preallocate necessary memory addresses, so we don't need
+                               to reallocate them later. This would save us some performance. */
+                       new_vec_by_output.reserve(vec.size());
+                       for (auto &vec_i : vec) {
+                               /* If pointers from map by input and output are not same,
+                                       we will add 'CraftDefinition*' to a new vector. */
+                               if (def != vec_i) {
+                                       /* Adding dereferenced iterator value (which are
+                                               'CraftDefinition' reference) to a new vector. */
+                                       new_vec_by_output.push_back(vec_i);
+                               }
+                       }
+                       // Swaps assigned to current key value with new vector for output map.
+                       m_output_craft_definitions[output.item].swap(new_vec_by_output);
+               }
+               if (got_hit)
+                       // Swaps value with new vector for input map.
+                       m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0].swap(new_vec_by_input);
+
+               return got_hit;
+       }
+
        virtual std::string dump() const
        {
                std::ostringstream os(std::ios::binary);
                os << "Crafting definitions:\n";
-               for (int type = 0; type <= craft_hash_type_max; type++) {
-                       for (std::map<u64, std::vector<CraftDefinition*> >::const_iterator
-                                       it = (m_craft_defs[type]).begin();
-                                       it != (m_craft_defs[type]).end(); it++) {
-                               for (std::vector<CraftDefinition*>::const_iterator
-                                               iit = it->second.begin(); iit != it->second.end(); iit++) {
-                                       os << "type " << type << " hash " << it->first << (*iit)->dump() << "\n";
+               for (int type = 0; type <= craft_hash_type_max; ++type) {
+                       for (auto it = m_craft_defs[type].begin();
+                                       it != m_craft_defs[type].end(); ++it) {
+                               for (std::vector<CraftDefinition*>::size_type i = 0;
+                                               i < it->second.size(); i++) {
+                                       os << "type " << type
+                                               << " hash " << it->first
+                                               << " def " << it->second[i]->dump()
+                                               << "\n";
                                }
                        }
                }
@@ -983,15 +1076,12 @@ public:
        }
        virtual void clear()
        {
-               for (int type = 0; type <= craft_hash_type_max; type++) {
-                       for (std::map<u64, std::vector<CraftDefinition*> >::iterator
-                                       it = m_craft_defs[type].begin();
-                                       it != m_craft_defs[type].end(); it++) {
-                               for (std::vector<CraftDefinition*>::iterator
-                                               iit = it->second.begin(); iit != it->second.end(); iit++) {
-                                       delete *iit;
+               for (int type = 0; type <= craft_hash_type_max; ++type) {
+                       for (auto &it : m_craft_defs[type]) {
+                               for (auto &iit : it.second) {
+                                       delete iit;
                                }
-                               it->second.clear();
+                               it.second.clear();
                        }
                        m_craft_defs[type].clear();
                }
@@ -1000,11 +1090,9 @@ public:
        virtual void initHashes(IGameDef *gamedef)
        {
                // Move the CraftDefs from the unhashed layer into layers higher up.
-               for (std::vector<CraftDefinition*>::iterator
-                       it = (m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0]).begin();
-                       it != (m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0]).end(); it++) {
-                       CraftDefinition *def = *it;
-
+               std::vector<CraftDefinition *> &unhashed =
+                       m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0];
+               for (auto def : unhashed) {
                        // Initialize and get the definition's hash
                        def->initHash(gamedef);
                        CraftHashType type = def->getHashType();
@@ -1013,16 +1101,16 @@ public:
                        // Enter the definition
                        m_craft_defs[type][hash].push_back(def);
                }
-               m_craft_defs[(int) CRAFT_HASH_TYPE_UNHASHED][0].clear();
+               unhashed.clear();
        }
 private:
-       //TODO: change both maps to unordered_map when c++11 can be used
-       std::vector<std::map<u64, std::vector<CraftDefinition*> > > m_craft_defs;
-       std::map<std::string, std::vector<CraftDefinition*> > m_output_craft_definitions;
+       std::vector<std::unordered_map<u64, std::vector<CraftDefinition*> > >
+               m_craft_defs;
+       std::unordered_map<std::string, std::vector<CraftDefinition*> >
+               m_output_craft_definitions;
 };
 
 IWritableCraftDefManager* createCraftDefManager()
 {
        return new CCraftDefManager();
 }
-