From 03e0dd33a847a83d975282c6caf6b926306e7b57 Mon Sep 17 00:00:00 2001
From: gregorycu <gregory.currie@gmail.com>
Date: Tue, 27 Jan 2015 00:46:55 +1100
Subject: Optimize minetest.get_(all)_craft_recipe(s)

Signed off by: ShadowNinja, kwolekr
---
 src/craftdef.cpp | 103 +++++++++++++++----------------------------------------
 1 file changed, 28 insertions(+), 75 deletions(-)

(limited to 'src/craftdef.cpp')

diff --git a/src/craftdef.cpp b/src/craftdef.cpp
index 80937ccb7..bca16a4c6 100644
--- a/src/craftdef.cpp
+++ b/src/craftdef.cpp
@@ -27,6 +27,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "gamedef.h"
 #include "inventory.h"
 #include "util/serialize.h"
+#include "util/numeric.h"
 #include "strfnd.h"
 #include "exceptions.h"
 
@@ -931,85 +932,30 @@ public:
 		}
 		return false;
 	}
-	virtual bool getCraftRecipe(CraftInput &input, CraftOutput &output,
-			IGameDef *gamedef) const
-	{
-		CraftOutput tmpout;
-		tmpout.item = "";
-		tmpout.time = 0;
-
-		// If output item is empty, abort.
-		if(output.item.empty())
-			return false;
-
-		// Walk crafting definitions from back to front, so that later
-		// definitions can override earlier ones.
-		for(std::vector<CraftDefinition*>::const_reverse_iterator
-				i = m_craft_definitions.rbegin();
-				i != m_craft_definitions.rend(); i++)
-		{
-			CraftDefinition *def = *i;
-
-			/*infostream<<"Checking "<<input.dump()<<std::endl
-					<<" against "<<def->dump()<<std::endl;*/
 
-			try {
-				tmpout = def->getOutput(input, gamedef);
-				if((tmpout.item.substr(0,output.item.length()) == output.item) &&
-					((tmpout.item[output.item.length()] == 0) ||
-					(tmpout.item[output.item.length()] == ' ')))
-				{
-					// Get output, then decrement input (if requested)
-					input = def->getInput(output, gamedef);
-					return true;
-				}
-			}
-			catch(SerializationError &e)
-			{
-				errorstream<<"getCraftResult: ERROR: "
-						<<"Serialization error in recipe "
-						<<def->dump()<<std::endl;
-				// then go on with the next craft definition
-			}
-		}
-		return false;
-	}
 	virtual std::vector<CraftDefinition*> getCraftRecipes(CraftOutput &output,
-			IGameDef *gamedef) const
+			IGameDef *gamedef, unsigned limit=0) const
 	{
-		std::vector<CraftDefinition*> recipes_list;
-		CraftInput input;
-		CraftOutput tmpout;
-		tmpout.item = "";
-		tmpout.time = 0;
+		std::vector<CraftDefinition*> recipes;
 
-		for(std::vector<CraftDefinition*>::const_reverse_iterator
-				i = m_craft_definitions.rbegin();
-				i != m_craft_definitions.rend(); i++)
-		{
-			CraftDefinition *def = *i;
+		std::map<std::string, std::vector<CraftDefinition*> >::const_iterator
+			vec_iter = m_output_craft_definitions.find(output.item);
 
-			/*infostream<<"Checking "<<input.dump()<<std::endl
-					<<" against "<<def->dump()<<std::endl;*/
+		if (vec_iter == m_output_craft_definitions.end())
+			return recipes;
 
-			try {
-				tmpout = def->getOutput(input, gamedef);
-				if(tmpout.item.substr(0,output.item.length()) == output.item)
-				{
-					// Get output, then decrement input (if requested)
-					input = def->getInput(output, gamedef);
-					recipes_list.push_back(*i);
-				}
-			}
-			catch(SerializationError &e)
-			{
-				errorstream<<"getCraftResult: ERROR: "
-						<<"Serialization error in recipe "
-						<<def->dump()<<std::endl;
-				// then go on with the next craft definition
-			}
+		const std::vector<CraftDefinition*> &vec = vec_iter->second;
+
+		recipes.reserve(limit ? MYMIN(limit, vec.size()) : vec.size());
+
+		for (std::vector<CraftDefinition*>::const_reverse_iterator
+				it = vec.rbegin(); it != vec.rend(); ++it) {
+			if (limit && recipes.size() >= limit)
+				break;
+			recipes.push_back(*it);
 		}
-		return recipes_list;
+
+		return recipes;
 	}
 	virtual std::string dump() const
 	{
@@ -1023,11 +969,16 @@ public:
 		}
 		return os.str();
 	}
-	virtual void registerCraft(CraftDefinition *def)
+	virtual void registerCraft(CraftDefinition *def, IGameDef *gamedef)
 	{
 		verbosestream<<"registerCraft: registering craft definition: "
 				<<def->dump()<<std::endl;
 		m_craft_definitions.push_back(def);
+
+		CraftInput input;
+		std::string output_name = craftGetItemName(
+				def->getOutput(input, gamedef).item, gamedef);
+		m_output_craft_definitions[output_name].push_back(def);
 	}
 	virtual void clear()
 	{
@@ -1037,6 +988,7 @@ public:
 			delete *i;
 		}
 		m_craft_definitions.clear();
+		m_output_craft_definitions.clear();
 	}
 	virtual void serialize(std::ostream &os) const
 	{
@@ -1053,7 +1005,7 @@ public:
 			os<<serializeString(tmp_os.str());
 		}
 	}
-	virtual void deSerialize(std::istream &is)
+	virtual void deSerialize(std::istream &is, IGameDef *gamedef)
 	{
 		// Clear everything
 		clear();
@@ -1067,11 +1019,12 @@ public:
 			std::istringstream tmp_is(deSerializeString(is), std::ios::binary);
 			CraftDefinition *def = CraftDefinition::deSerialize(tmp_is);
 			// Register
-			registerCraft(def);
+			registerCraft(def, gamedef);
 		}
 	}
 private:
 	std::vector<CraftDefinition*> m_craft_definitions;
+	std::map<std::string, std::vector<CraftDefinition*> > m_output_craft_definitions;
 };
 
 IWritableCraftDefManager* createCraftDefManager()
-- 
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