Move scriptapi to separate folder (by sapier)

On the lua side, notably minetest.env:<function>(<args>) should now
be replaced by minetest.<function>(<args>).
The old way is and will stay supported for a long time.

Also:
Update and clean up lua_api.txt (by celeron55)
Move EnvRef to lua and remove add_rat and add_firefly (by kahrl)
Add separate src/util/CMakeLists.txt, other minor fixes (by kahrl)

9 files changed, 1769 insertions, 0 deletions

diff --git a/src/script/common/CMakeLists.txt b/src/script/common/CMakeLists.txt
new file mode 100644
index 000000000..c8f7ef783
--- /dev/null
+++ b/src/script/common/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(SCRIPT_COMMON_SRCS
+	${CMAKE_CURRENT_SOURCE_DIR}/c_content.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/c_converter.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/c_types.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/c_internal.cpp
+	PARENT_SCOPE)
diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
new file mode 100644
index 000000000..c7966a0be
--- /dev/null
+++ b/src/script/common/c_content.cpp
@@ -0,0 +1,923 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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 "common/c_content.h"
+#include "common/c_converter.h"
+#include "common/c_types.h"
+#include "nodedef.h"
+#include "itemdef.h"
+#include "object_properties.h"
+#include "cpp_api/s_node.h"
+#include "lua_api/l_object.h"
+#include "lua_api/l_item.h"
+#include "common/c_internal.h"
+#include "server.h"
+#include "log.h"
+#include "tool.h"
+#include "server.h"
+
+struct EnumString es_TileAnimationType[] =
+{
+	{TAT_NONE, "none"},
+	{TAT_VERTICAL_FRAMES, "vertical_frames"},
+	{0, NULL},
+};
+
+/******************************************************************************/
+ItemDefinition read_item_definition(lua_State* L,int index,
+		ItemDefinition default_def)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+
+	// Read the item definition
+	ItemDefinition def = default_def;
+
+	def.type = (ItemType)getenumfield(L, index, "type",
+			es_ItemType, ITEM_NONE);
+	getstringfield(L, index, "name", def.name);
+	getstringfield(L, index, "description", def.description);
+	getstringfield(L, index, "inventory_image", def.inventory_image);
+	getstringfield(L, index, "wield_image", def.wield_image);
+
+	lua_getfield(L, index, "wield_scale");
+	if(lua_istable(L, -1)){
+		def.wield_scale = check_v3f(L, -1);
+	}
+	lua_pop(L, 1);
+
+	def.stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
+	if(def.stack_max == 0)
+		def.stack_max = 1;
+
+	lua_getfield(L, index, "on_use");
+	def.usable = lua_isfunction(L, -1);
+	lua_pop(L, 1);
+
+	getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
+
+	warn_if_field_exists(L, index, "tool_digging_properties",
+			"deprecated: use tool_capabilities");
+
+	lua_getfield(L, index, "tool_capabilities");
+	if(lua_istable(L, -1)){
+		def.tool_capabilities = new ToolCapabilities(
+				read_tool_capabilities(L, -1));
+	}
+
+	// If name is "" (hand), ensure there are ToolCapabilities
+	// because it will be looked up there whenever any other item has
+	// no ToolCapabilities
+	if(def.name == "" && def.tool_capabilities == NULL){
+		def.tool_capabilities = new ToolCapabilities();
+	}
+
+	lua_getfield(L, index, "groups");
+	read_groups(L, -1, def.groups);
+	lua_pop(L, 1);
+
+	lua_getfield(L, index, "sounds");
+	if(lua_istable(L, -1)){
+		lua_getfield(L, -1, "place");
+		read_soundspec(L, -1, def.sound_place);
+		lua_pop(L, 1);
+	}
+	lua_pop(L, 1);
+
+	// Client shall immediately place this node when player places the item.
+	// Server will update the precise end result a moment later.
+	// "" = no prediction
+	getstringfield(L, index, "node_placement_prediction",
+			def.node_placement_prediction);
+
+	return def;
+}
+
+/******************************************************************************/
+void read_object_properties(lua_State *L, int index,
+		ObjectProperties *prop)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+	if(!lua_istable(L, index))
+		return;
+
+	prop->hp_max = getintfield_default(L, -1, "hp_max", 10);
+
+	getboolfield(L, -1, "physical", prop->physical);
+
+	getfloatfield(L, -1, "weight", prop->weight);
+
+	lua_getfield(L, -1, "collisionbox");
+	if(lua_istable(L, -1))
+		prop->collisionbox = read_aabb3f(L, -1, 1.0);
+	lua_pop(L, 1);
+
+	getstringfield(L, -1, "visual", prop->visual);
+
+	getstringfield(L, -1, "mesh", prop->mesh);
+
+	lua_getfield(L, -1, "visual_size");
+	if(lua_istable(L, -1))
+		prop->visual_size = read_v2f(L, -1);
+	lua_pop(L, 1);
+
+	lua_getfield(L, -1, "textures");
+	if(lua_istable(L, -1)){
+		prop->textures.clear();
+		int table = lua_gettop(L);
+		lua_pushnil(L);
+		while(lua_next(L, table) != 0){
+			// key at index -2 and value at index -1
+			if(lua_isstring(L, -1))
+				prop->textures.push_back(lua_tostring(L, -1));
+			else
+				prop->textures.push_back("");
+			// removes value, keeps key for next iteration
+			lua_pop(L, 1);
+		}
+	}
+	lua_pop(L, 1);
+
+	lua_getfield(L, -1, "colors");
+	if(lua_istable(L, -1)){
+		prop->colors.clear();
+		int table = lua_gettop(L);
+		lua_pushnil(L);
+		while(lua_next(L, table) != 0){
+			// key at index -2 and value at index -1
+			if(lua_isstring(L, -1))
+				prop->colors.push_back(readARGB8(L, -1));
+			else
+				prop->colors.push_back(video::SColor(255, 255, 255, 255));
+			// removes value, keeps key for next iteration
+			lua_pop(L, 1);
+		}
+	}
+	lua_pop(L, 1);
+
+	lua_getfield(L, -1, "spritediv");
+	if(lua_istable(L, -1))
+		prop->spritediv = read_v2s16(L, -1);
+	lua_pop(L, 1);
+
+	lua_getfield(L, -1, "initial_sprite_basepos");
+	if(lua_istable(L, -1))
+		prop->initial_sprite_basepos = read_v2s16(L, -1);
+	lua_pop(L, 1);
+
+	getboolfield(L, -1, "is_visible", prop->is_visible);
+	getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
+	getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
+}
+
+/******************************************************************************/
+TileDef read_tiledef(lua_State *L, int index)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+
+	TileDef tiledef;
+
+	// key at index -2 and value at index
+	if(lua_isstring(L, index)){
+		// "default_lava.png"
+		tiledef.name = lua_tostring(L, index);
+	}
+	else if(lua_istable(L, index))
+	{
+		// {name="default_lava.png", animation={}}
+		tiledef.name = "";
+		getstringfield(L, index, "name", tiledef.name);
+		getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
+		tiledef.backface_culling = getboolfield_default(
+					L, index, "backface_culling", true);
+		// animation = {}
+		lua_getfield(L, index, "animation");
+		if(lua_istable(L, -1)){
+			// {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
+			tiledef.animation.type = (TileAnimationType)
+					getenumfield(L, -1, "type", es_TileAnimationType,
+					TAT_NONE);
+			tiledef.animation.aspect_w =
+					getintfield_default(L, -1, "aspect_w", 16);
+			tiledef.animation.aspect_h =
+					getintfield_default(L, -1, "aspect_h", 16);
+			tiledef.animation.length =
+					getfloatfield_default(L, -1, "length", 1.0);
+		}
+		lua_pop(L, 1);
+	}
+
+	return tiledef;
+}
+
+/******************************************************************************/
+ContentFeatures read_content_features(lua_State *L, int index)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+
+	ContentFeatures f;
+
+	/* Cache existence of some callbacks */
+	lua_getfield(L, index, "on_construct");
+	if(!lua_isnil(L, -1)) f.has_on_construct = true;
+	lua_pop(L, 1);
+	lua_getfield(L, index, "on_destruct");
+	if(!lua_isnil(L, -1)) f.has_on_destruct = true;
+	lua_pop(L, 1);
+	lua_getfield(L, index, "after_destruct");
+	if(!lua_isnil(L, -1)) f.has_after_destruct = true;
+	lua_pop(L, 1);
+
+	lua_getfield(L, index, "on_rightclick");
+	f.rightclickable = lua_isfunction(L, -1);
+	lua_pop(L, 1);
+	
+	/* Name */
+	getstringfield(L, index, "name", f.name);
+
+	/* Groups */
+	lua_getfield(L, index, "groups");
+	read_groups(L, -1, f.groups);
+	lua_pop(L, 1);
+
+	/* Visual definition */
+
+	f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
+			ScriptApiNode::es_DrawType,NDT_NORMAL);
+	getfloatfield(L, index, "visual_scale", f.visual_scale);
+
+	// tiles = {}
+	lua_getfield(L, index, "tiles");
+	// If nil, try the deprecated name "tile_images" instead
+	if(lua_isnil(L, -1)){
+		lua_pop(L, 1);
+		warn_if_field_exists(L, index, "tile_images",
+				"Deprecated; new name is \"tiles\".");
+		lua_getfield(L, index, "tile_images");
+	}
+	if(lua_istable(L, -1)){
+		int table = lua_gettop(L);
+		lua_pushnil(L);
+		int i = 0;
+		while(lua_next(L, table) != 0){
+			// Read tiledef from value
+			f.tiledef[i] = read_tiledef(L, -1);
+			// removes value, keeps key for next iteration
+			lua_pop(L, 1);
+			i++;
+			if(i==6){
+				lua_pop(L, 1);
+				break;
+			}
+		}
+		// Copy last value to all remaining textures
+		if(i >= 1){
+			TileDef lasttile = f.tiledef[i-1];
+			while(i < 6){
+				f.tiledef[i] = lasttile;
+				i++;
+			}
+		}
+	}
+	lua_pop(L, 1);
+
+	// special_tiles = {}
+	lua_getfield(L, index, "special_tiles");
+	// If nil, try the deprecated name "special_materials" instead
+	if(lua_isnil(L, -1)){
+		lua_pop(L, 1);
+		warn_if_field_exists(L, index, "special_materials",
+				"Deprecated; new name is \"special_tiles\".");
+		lua_getfield(L, index, "special_materials");
+	}
+	if(lua_istable(L, -1)){
+		int table = lua_gettop(L);
+		lua_pushnil(L);
+		int i = 0;
+		while(lua_next(L, table) != 0){
+			// Read tiledef from value
+			f.tiledef_special[i] = read_tiledef(L, -1);
+			// removes value, keeps key for next iteration
+			lua_pop(L, 1);
+			i++;
+			if(i==6){
+				lua_pop(L, 1);
+				break;
+			}
+		}
+	}
+	lua_pop(L, 1);
+
+	f.alpha = getintfield_default(L, index, "alpha", 255);
+
+	bool usealpha = getboolfield_default(L, index,
+			"use_texture_alpha", false);
+	if (usealpha)
+		f.alpha = 0;
+
+	/* Other stuff */
+
+	lua_getfield(L, index, "post_effect_color");
+	if(!lua_isnil(L, -1))
+		f.post_effect_color = readARGB8(L, -1);
+	lua_pop(L, 1);
+
+	f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
+			ScriptApiNode::es_ContentParamType, CPT_NONE);
+	f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
+			ScriptApiNode::es_ContentParamType2, CPT2_NONE);
+
+	// Warn about some deprecated fields
+	warn_if_field_exists(L, index, "wall_mounted",
+			"deprecated: use paramtype2 = 'wallmounted'");
+	warn_if_field_exists(L, index, "light_propagates",
+			"deprecated: determined from paramtype");
+	warn_if_field_exists(L, index, "dug_item",
+			"deprecated: use 'drop' field");
+	warn_if_field_exists(L, index, "extra_dug_item",
+			"deprecated: use 'drop' field");
+	warn_if_field_exists(L, index, "extra_dug_item_rarity",
+			"deprecated: use 'drop' field");
+	warn_if_field_exists(L, index, "metadata_name",
+			"deprecated: use on_add and metadata callbacks");
+
+	// True for all ground-like things like stone and mud, false for eg. trees
+	getboolfield(L, index, "is_ground_content", f.is_ground_content);
+	f.light_propagates = (f.param_type == CPT_LIGHT);
+	getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
+	// This is used for collision detection.
+	// Also for general solidness queries.
+	getboolfield(L, index, "walkable", f.walkable);
+	// Player can point to these
+	getboolfield(L, index, "pointable", f.pointable);
+	// Player can dig these
+	getboolfield(L, index, "diggable", f.diggable);
+	// Player can climb these
+	getboolfield(L, index, "climbable", f.climbable);
+	// Player can build on these
+	getboolfield(L, index, "buildable_to", f.buildable_to);
+	// Whether the node is non-liquid, source liquid or flowing liquid
+	f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
+			ScriptApiNode::es_LiquidType, LIQUID_NONE);
+	// If the content is liquid, this is the flowing version of the liquid.
+	getstringfield(L, index, "liquid_alternative_flowing",
+			f.liquid_alternative_flowing);
+	// If the content is liquid, this is the source version of the liquid.
+	getstringfield(L, index, "liquid_alternative_source",
+			f.liquid_alternative_source);
+	// Viscosity for fluid flow, ranging from 1 to 7, with
+	// 1 giving almost instantaneous propagation and 7 being
+	// the slowest possible
+	f.liquid_viscosity = getintfield_default(L, index,
+			"liquid_viscosity", f.liquid_viscosity);
+	getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
+	// Amount of light the node emits
+	f.light_source = getintfield_default(L, index,
+			"light_source", f.light_source);
+	f.damage_per_second = getintfield_default(L, index,
+			"damage_per_second", f.damage_per_second);
+
+	lua_getfield(L, index, "node_box");
+	if(lua_istable(L, -1))
+		f.node_box = read_nodebox(L, -1);
+	lua_pop(L, 1);
+
+	lua_getfield(L, index, "selection_box");
+	if(lua_istable(L, -1))
+		f.selection_box = read_nodebox(L, -1);
+ 	lua_pop(L, 1);
+
+	// Set to true if paramtype used to be 'facedir_simple'
+	getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
+	// Set to true if wall_mounted used to be set to true
+	getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
+
+	// Sound table
+	lua_getfield(L, index, "sounds");
+	if(lua_istable(L, -1)){
+		lua_getfield(L, -1, "footstep");
+		read_soundspec(L, -1, f.sound_footstep);
+		lua_pop(L, 1);
+		lua_getfield(L, -1, "dig");
+		read_soundspec(L, -1, f.sound_dig);
+		lua_pop(L, 1);
+		lua_getfield(L, -1, "dug");
+		read_soundspec(L, -1, f.sound_dug);
+		lua_pop(L, 1);
+	}
+	lua_pop(L, 1);
+
+	return f;
+}
+
+/******************************************************************************/
+void read_server_sound_params(lua_State *L, int index,
+		ServerSoundParams &params)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+	// Clear
+	params = ServerSoundParams();
+	if(lua_istable(L, index)){
+		getfloatfield(L, index, "gain", params.gain);
+		getstringfield(L, index, "to_player", params.to_player);
+		lua_getfield(L, index, "pos");
+		if(!lua_isnil(L, -1)){
+			v3f p = read_v3f(L, -1)*BS;
+			params.pos = p;
+			params.type = ServerSoundParams::SSP_POSITIONAL;
+		}
+		lua_pop(L, 1);
+		lua_getfield(L, index, "object");
+		if(!lua_isnil(L, -1)){
+			ObjectRef *ref = ObjectRef::checkobject(L, -1);
+			ServerActiveObject *sao = ObjectRef::getobject(ref);
+			if(sao){
+				params.object = sao->getId();
+				params.type = ServerSoundParams::SSP_OBJECT;
+			}
+		}
+		lua_pop(L, 1);
+		params.max_hear_distance = BS*getfloatfield_default(L, index,
+				"max_hear_distance", params.max_hear_distance/BS);
+		getboolfield(L, index, "loop", params.loop);
+	}
+}
+
+/******************************************************************************/
+void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+	if(lua_isnil(L, index)){
+	} else if(lua_istable(L, index)){
+		getstringfield(L, index, "name", spec.name);
+		getfloatfield(L, index, "gain", spec.gain);
+	} else if(lua_isstring(L, index)){
+		spec.name = lua_tostring(L, index);
+	}
+}
+
+/******************************************************************************/
+NodeBox read_nodebox(lua_State *L, int index)
+{
+	NodeBox nodebox;
+	if(lua_istable(L, -1)){
+		nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
+				ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
+
+		lua_getfield(L, index, "fixed");
+		if(lua_istable(L, -1))
+			nodebox.fixed = read_aabb3f_vector(L, -1, BS);
+		lua_pop(L, 1);
+
+		lua_getfield(L, index, "wall_top");
+		if(lua_istable(L, -1))
+			nodebox.wall_top = read_aabb3f(L, -1, BS);
+		lua_pop(L, 1);
+
+		lua_getfield(L, index, "wall_bottom");
+		if(lua_istable(L, -1))
+			nodebox.wall_bottom = read_aabb3f(L, -1, BS);
+		lua_pop(L, 1);
+
+		lua_getfield(L, index, "wall_side");
+		if(lua_istable(L, -1))
+			nodebox.wall_side = read_aabb3f(L, -1, BS);
+		lua_pop(L, 1);
+	}
+	return nodebox;
+}
+
+/******************************************************************************/
+MapNode readnode(lua_State *L, int index, INodeDefManager *ndef)
+{
+	lua_getfield(L, index, "name");
+	const char *name = luaL_checkstring(L, -1);
+	lua_pop(L, 1);
+	u8 param1;
+	lua_getfield(L, index, "param1");
+	if(lua_isnil(L, -1))
+		param1 = 0;
+	else
+		param1 = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	u8 param2;
+	lua_getfield(L, index, "param2");
+	if(lua_isnil(L, -1))
+		param2 = 0;
+	else
+		param2 = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	return MapNode(ndef, name, param1, param2);
+}
+
+/******************************************************************************/
+void pushnode(lua_State *L, const MapNode &n, INodeDefManager *ndef)
+{
+	lua_newtable(L);
+	lua_pushstring(L, ndef->get(n).name.c_str());
+	lua_setfield(L, -2, "name");
+	lua_pushnumber(L, n.getParam1());
+	lua_setfield(L, -2, "param1");
+	lua_pushnumber(L, n.getParam2());
+	lua_setfield(L, -2, "param2");
+}
+
+/******************************************************************************/
+void warn_if_field_exists(lua_State *L, int table,
+		const char *fieldname, const std::string &message)
+{
+	lua_getfield(L, table, fieldname);
+	if(!lua_isnil(L, -1)){
+//TODO find way to access backtrace fct from here
+		//		infostream<<script_get_backtrace(L)<<std::endl;
+		infostream<<"WARNING: field \""<<fieldname<<"\": "
+				<<message<<std::endl;
+	}
+	lua_pop(L, 1);
+}
+
+/******************************************************************************/
+int getenumfield(lua_State *L, int table,
+		const char *fieldname, const EnumString *spec, int default_)
+{
+	int result = default_;
+	string_to_enum(spec, result,
+			getstringfield_default(L, table, fieldname, ""));
+	return result;
+}
+
+/******************************************************************************/
+bool string_to_enum(const EnumString *spec, int &result,
+		const std::string &str)
+{
+	const EnumString *esp = spec;
+	while(esp->str){
+		if(str == std::string(esp->str)){
+			result = esp->num;
+			return true;
+		}
+		esp++;
+	}
+	return false;
+}
+
+/******************************************************************************/
+ItemStack read_item(lua_State* L, int index,Server* srv)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+
+	if(lua_isnil(L, index))
+	{
+		return ItemStack();
+	}
+	else if(lua_isuserdata(L, index))
+	{
+		// Convert from LuaItemStack
+		LuaItemStack *o = LuaItemStack::checkobject(L, index);
+		return o->getItem();
+	}
+	else if(lua_isstring(L, index))
+	{
+		// Convert from itemstring
+		std::string itemstring = lua_tostring(L, index);
+		IItemDefManager *idef = srv->idef();
+		try
+		{
+			ItemStack item;
+			item.deSerialize(itemstring, idef);
+			return item;
+		}
+		catch(SerializationError &e)
+		{
+			infostream<<"WARNING: unable to create item from itemstring"
+					<<": "<<itemstring<<std::endl;
+			return ItemStack();
+		}
+	}
+	else if(lua_istable(L, index))
+	{
+		// Convert from table
+		IItemDefManager *idef = srv->idef();
+		std::string name = getstringfield_default(L, index, "name", "");
+		int count = getintfield_default(L, index, "count", 1);
+		int wear = getintfield_default(L, index, "wear", 0);
+		std::string metadata = getstringfield_default(L, index, "metadata", "");
+		return ItemStack(name, count, wear, metadata, idef);
+	}
+	else
+	{
+		throw LuaError(L, "Expecting itemstack, itemstring, table or nil");
+	}
+}
+
+/******************************************************************************/
+void push_tool_capabilities(lua_State *L,
+		const ToolCapabilities &toolcap)
+{
+	lua_newtable(L);
+	setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
+		setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
+		// Create groupcaps table
+		lua_newtable(L);
+		// For each groupcap
+		for(std::map<std::string, ToolGroupCap>::const_iterator
+				i = toolcap.groupcaps.begin(); i != toolcap.groupcaps.end(); i++){
+			// Create groupcap table
+			lua_newtable(L);
+			const std::string &name = i->first;
+			const ToolGroupCap &groupcap = i->second;
+			// Create subtable "times"
+			lua_newtable(L);
+			for(std::map<int, float>::const_iterator
+					i = groupcap.times.begin(); i != groupcap.times.end(); i++){
+				int rating = i->first;
+				float time = i->second;
+				lua_pushinteger(L, rating);
+				lua_pushnumber(L, time);
+				lua_settable(L, -3);
+			}
+			// Set subtable "times"
+			lua_setfield(L, -2, "times");
+			// Set simple parameters
+			setintfield(L, -1, "maxlevel", groupcap.maxlevel);
+			setintfield(L, -1, "uses", groupcap.uses);
+			// Insert groupcap table into groupcaps table
+			lua_setfield(L, -2, name.c_str());
+		}
+		// Set groupcaps table
+		lua_setfield(L, -2, "groupcaps");
+		//Create damage_groups table
+		lua_newtable(L);
+		// For each damage group
+		for(std::map<std::string, s16>::const_iterator
+				i = toolcap.damageGroups.begin(); i != toolcap.damageGroups.end(); i++){
+			// Create damage group table
+			lua_pushinteger(L, i->second);
+			lua_setfield(L, -2, i->first.c_str());
+		}
+		lua_setfield(L, -2, "damage_groups");
+}
+
+/******************************************************************************/
+void push_inventory_list(Inventory *inv, const char *name,
+		lua_State *L)
+{
+	InventoryList *invlist = inv->getList(name);
+	if(invlist == NULL){
+		lua_pushnil(L);
+		return;
+	}
+	std::vector<ItemStack> items;
+	for(u32 i=0; i<invlist->getSize(); i++)
+		items.push_back(invlist->getItem(i));
+	push_items(L, items);
+}
+
+/******************************************************************************/
+void read_inventory_list(Inventory *inv, const char *name,
+		lua_State *L, int tableindex, Server* srv,int forcesize)
+{
+	if(tableindex < 0)
+		tableindex = lua_gettop(L) + 1 + tableindex;
+	// If nil, delete list
+	if(lua_isnil(L, tableindex)){
+		inv->deleteList(name);
+		return;
+	}
+	// Otherwise set list
+	std::vector<ItemStack> items = read_items(L, tableindex,srv);
+	int listsize = (forcesize != -1) ? forcesize : items.size();
+	InventoryList *invlist = inv->addList(name, listsize);
+	int index = 0;
+	for(std::vector<ItemStack>::const_iterator
+			i = items.begin(); i != items.end(); i++){
+		if(forcesize != -1 && index == forcesize)
+			break;
+		invlist->changeItem(index, *i);
+		index++;
+	}
+	while(forcesize != -1 && index < forcesize){
+		invlist->deleteItem(index);
+		index++;
+	}
+}
+
+/******************************************************************************/
+ToolCapabilities read_tool_capabilities(
+		lua_State *L, int table)
+{
+	ToolCapabilities toolcap;
+	getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
+	getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
+	lua_getfield(L, table, "groupcaps");
+	if(lua_istable(L, -1)){
+		int table_groupcaps = lua_gettop(L);
+		lua_pushnil(L);
+		while(lua_next(L, table_groupcaps) != 0){
+			// key at index -2 and value at index -1
+			std::string groupname = luaL_checkstring(L, -2);
+			if(lua_istable(L, -1)){
+				int table_groupcap = lua_gettop(L);
+				// This will be created
+				ToolGroupCap groupcap;
+				// Read simple parameters
+				getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
+				getintfield(L, table_groupcap, "uses", groupcap.uses);
+				// DEPRECATED: maxwear
+				float maxwear = 0;
+				if(getfloatfield(L, table_groupcap, "maxwear", maxwear)){
+					if(maxwear != 0)
+						groupcap.uses = 1.0/maxwear;
+					else
+						groupcap.uses = 0;
+					infostream<<script_get_backtrace(L)<<std::endl;
+					infostream<<"WARNING: field \"maxwear\" is deprecated; "
+							<<"should replace with uses=1/maxwear"<<std::endl;
+				}
+				// Read "times" table
+				lua_getfield(L, table_groupcap, "times");
+				if(lua_istable(L, -1)){
+					int table_times = lua_gettop(L);
+					lua_pushnil(L);
+					while(lua_next(L, table_times) != 0){
+						// key at index -2 and value at index -1
+						int rating = luaL_checkinteger(L, -2);
+						float time = luaL_checknumber(L, -1);
+						groupcap.times[rating] = time;
+						// removes value, keeps key for next iteration
+						lua_pop(L, 1);
+					}
+				}
+				lua_pop(L, 1);
+				// Insert groupcap into toolcap
+				toolcap.groupcaps[groupname] = groupcap;
+			}
+			// removes value, keeps key for next iteration
+			lua_pop(L, 1);
+		}
+	}
+	lua_pop(L, 1);
+
+	lua_getfield(L, table, "damage_groups");
+	if(lua_istable(L, -1)){
+		int table_damage_groups = lua_gettop(L);
+		lua_pushnil(L);
+		while(lua_next(L, table_damage_groups) != 0){
+			// key at index -2 and value at index -1
+			std::string groupname = luaL_checkstring(L, -2);
+			u16 value = luaL_checkinteger(L, -1);
+			toolcap.damageGroups[groupname] = value;
+			// removes value, keeps key for next iteration
+			lua_pop(L, 1);
+		}
+	}
+	lua_pop(L, 1);
+	return toolcap;
+}
+
+/******************************************************************************/
+void push_dig_params(lua_State *L,const DigParams &params)
+{
+	lua_newtable(L);
+	setboolfield(L, -1, "diggable", params.diggable);
+	setfloatfield(L, -1, "time", params.time);
+	setintfield(L, -1, "wear", params.wear);
+}
+
+/******************************************************************************/
+void push_hit_params(lua_State *L,const HitParams &params)
+{
+	lua_newtable(L);
+	setintfield(L, -1, "hp", params.hp);
+	setintfield(L, -1, "wear", params.wear);
+}
+
+/******************************************************************************/
+u32 getflagsfield(lua_State *L, int table,
+	const char *fieldname, FlagDesc *flagdesc) {
+	std::string flagstring;
+
+	flagstring = getstringfield_default(L, table, fieldname, "");
+	return readFlagString(flagstring, flagdesc);
+}
+
+/******************************************************************************/
+/* Lua Stored data!                                                           */
+/******************************************************************************/
+
+/******************************************************************************/
+void read_groups(lua_State *L, int index,
+		std::map<std::string, int> &result)
+{
+	if (!lua_istable(L,index))
+		return;
+	result.clear();
+	lua_pushnil(L);
+	if(index < 0)
+		index -= 1;
+	while(lua_next(L, index) != 0){
+		// key at index -2 and value at index -1
+		std::string name = luaL_checkstring(L, -2);
+		int rating = luaL_checkinteger(L, -1);
+		result[name] = rating;
+		// removes value, keeps key for next iteration
+		lua_pop(L, 1);
+	}
+}
+
+/******************************************************************************/
+void push_items(lua_State *L, const std::vector<ItemStack> &items)
+{
+	// Get the table insert function
+	lua_getglobal(L, "table");
+	lua_getfield(L, -1, "insert");
+	int table_insert = lua_gettop(L);
+	// Create and fill table
+	lua_newtable(L);
+	int table = lua_gettop(L);
+	for(u32 i=0; i<items.size(); i++){
+		ItemStack item = items[i];
+		lua_pushvalue(L, table_insert);
+		lua_pushvalue(L, table);
+		LuaItemStack::create(L, item);
+		if(lua_pcall(L, 2, 0, 0))
+			script_error(L, "error: %s", lua_tostring(L, -1));
+	}
+	lua_remove(L, -2); // Remove table
+	lua_remove(L, -2); // Remove insert
+}
+
+/******************************************************************************/
+std::vector<ItemStack> read_items(lua_State *L, int index,Server* srv)
+{
+	if(index < 0)
+		index = lua_gettop(L) + 1 + index;
+
+	std::vector<ItemStack> items;
+	luaL_checktype(L, index, LUA_TTABLE);
+	lua_pushnil(L);
+	while(lua_next(L, index) != 0){
+		// key at index -2 and value at index -1
+		items.push_back(read_item(L, -1, srv));
+		// removes value, keeps key for next iteration
+		lua_pop(L, 1);
+	}
+	return items;
+}
+
+/******************************************************************************/
+void luaentity_get(lua_State *L, u16 id)
+{
+	// Get minetest.luaentities[i]
+	lua_getglobal(L, "minetest");
+	lua_getfield(L, -1, "luaentities");
+	luaL_checktype(L, -1, LUA_TTABLE);
+	lua_pushnumber(L, id);
+	lua_gettable(L, -2);
+	lua_remove(L, -2); // luaentities
+	lua_remove(L, -2); // minetest
+}
+
+/******************************************************************************/
+NoiseParams *read_noiseparams(lua_State *L, int index)
+{
+	if (index < 0)
+		index = lua_gettop(L) + 1 + index;
+
+	if (!lua_istable(L, index))
+		return NULL;
+
+	NoiseParams *np = new NoiseParams;
+
+	np->offset  = getfloatfield_default(L, index, "offset", 0.0);
+	np->scale   = getfloatfield_default(L, index, "scale", 0.0);
+	lua_getfield(L, index, "spread");
+	np->spread  = read_v3f(L, -1);
+	lua_pop(L, 1);
+	np->seed    = getintfield_default(L, index, "seed", 0);
+	np->octaves = getintfield_default(L, index, "octaves", 0);
+	np->persist = getfloatfield_default(L, index, "persist", 0.0);
+
+	return np;
+}
diff --git a/src/script/common/c_content.h b/src/script/common/c_content.h
new file mode 100644
index 000000000..251a72e27
--- /dev/null
+++ b/src/script/common/c_content.h
@@ -0,0 +1,146 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+*/
+
+
+/******************************************************************************/
+/******************************************************************************/
+/* WARNING!!!! do NOT add this header in any include file or any code file    */
+/*             not being a script/modapi file!!!!!!!!                         */
+/******************************************************************************/
+/******************************************************************************/
+
+#ifndef C_CONTENT_H_
+#define C_CONTENT_H_
+
+extern "C" {
+#include <lua.h>
+}
+
+#include <iostream>
+#include <map>
+#include <vector>
+
+#include "irrlichttypes_bloated.h"
+#include "util/string.h"
+
+class MapNode;
+class INodeDefManager;
+class PointedThing;
+class ItemStack;
+class ItemDefinition;
+class ToolCapabilities;
+class ObjectProperties;
+class SimpleSoundSpec;
+class ServerSoundParams;
+class Inventory;
+class NodeBox;
+class ContentFeatures;
+class TileDef;
+class Server;
+struct DigParams;
+struct HitParams;
+struct EnumString;
+struct NoiseParams;
+
+
+ContentFeatures    read_content_features         (lua_State *L, int index);
+TileDef            read_tiledef                  (lua_State *L, int index);
+void               read_soundspec                (lua_State *L, int index,
+                                                  SimpleSoundSpec &spec);
+NodeBox            read_nodebox                  (lua_State *L, int index);
+
+void               read_server_sound_params      (lua_State *L, int index,
+                                                  ServerSoundParams &params);
+
+void          push_dig_params           (lua_State *L,const DigParams &params);
+void          push_hit_params           (lua_State *L,const HitParams &params);
+
+ItemStack     read_item                 (lua_State *L, int index, Server* srv);
+
+
+ToolCapabilities   read_tool_capabilities    (lua_State *L,
+                                              int table);
+void               push_tool_capabilities    (lua_State *L,
+                                              const ToolCapabilities &prop);
+
+ItemDefinition     read_item_definition      (lua_State *L,
+                                              int index,
+                                              ItemDefinition default_def);
+void               read_object_properties    (lua_State *L,
+                                              int index,
+                                              ObjectProperties *prop);
+
+//TODO fix parameter oreder!
+void               push_inventory_list       (Inventory *inv,
+                                              const char *name,
+                                              lua_State *L);
+void               read_inventory_list       (Inventory *inv,
+                                              const char *name,
+                                              lua_State *L,
+                                              int tableindex,
+                                              Server* srv,
+                                              int forcesize=-1);
+
+MapNode            readnode                  (lua_State *L,
+                                              int index,
+                                              INodeDefManager *ndef);
+void               pushnode                  (lua_State *L,
+                                              const MapNode &n,
+                                              INodeDefManager *ndef);
+
+NodeBox            read_nodebox              (lua_State *L, int index);
+
+void               read_groups               (lua_State *L,
+                                              int index,
+                                              std::map<std::string, int> &result);
+
+//TODO rename to "read_enum_field"
+int                getenumfield              (lua_State *L,
+                                              int table,
+                                              const char *fieldname,
+                                              const EnumString *spec,
+                                              int default_);
+
+u32                getflagsfield             (lua_State *L, int table,
+                                              const char *fieldname,
+                                              FlagDesc *flagdesc);
+
+void               push_items                (lua_State *L,
+                                              const std::vector<ItemStack> &items);
+
+std::vector<ItemStack> read_items            (lua_State *L,
+                                              int index,
+                                              Server* srv);
+
+void               read_soundspec            (lua_State *L,
+                                              int index,
+                                              SimpleSoundSpec &spec);
+
+
+bool               string_to_enum            (const EnumString *spec,
+                                              int &result,
+                                              const std::string &str);
+
+NoiseParams*       read_noiseparams          (lua_State *L, int index);
+
+void               luaentity_get             (lua_State *L,u16 id);
+
+extern struct EnumString es_TileAnimationType[];
+
+#endif /* C_CONTENT_H_ */
diff --git a/src/script/common/c_converter.cpp b/src/script/common/c_converter.cpp
new file mode 100644
index 000000000..65c3654ae
--- /dev/null
+++ b/src/script/common/c_converter.cpp
@@ -0,0 +1,343 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+*/
+
+extern "C" {
+#include "lua.h"
+#include "lauxlib.h"
+}
+
+#include "util/numeric.h"
+#include "common/c_converter.h"
+#include "constants.h"
+
+void push_v3f(lua_State *L, v3f p)
+{
+	lua_newtable(L);
+	lua_pushnumber(L, p.X);
+	lua_setfield(L, -2, "x");
+	lua_pushnumber(L, p.Y);
+	lua_setfield(L, -2, "y");
+	lua_pushnumber(L, p.Z);
+	lua_setfield(L, -2, "z");
+}
+
+void push_v2f(lua_State *L, v2f p)
+{
+	lua_newtable(L);
+	lua_pushnumber(L, p.X);
+	lua_setfield(L, -2, "x");
+	lua_pushnumber(L, p.Y);
+	lua_setfield(L, -2, "y");
+}
+
+v2s16 read_v2s16(lua_State *L, int index)
+{
+	v2s16 p;
+	luaL_checktype(L, index, LUA_TTABLE);
+	lua_getfield(L, index, "x");
+	p.X = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "y");
+	p.Y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	return p;
+}
+
+v2f read_v2f(lua_State *L, int index)
+{
+	v2f p;
+	luaL_checktype(L, index, LUA_TTABLE);
+	lua_getfield(L, index, "x");
+	p.X = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "y");
+	p.Y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	return p;
+}
+
+v3f read_v3f(lua_State *L, int index)
+{
+	v3f pos;
+	luaL_checktype(L, index, LUA_TTABLE);
+	lua_getfield(L, index, "x");
+	pos.X = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "y");
+	pos.Y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "z");
+	pos.Z = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	return pos;
+}
+
+v3f check_v3f(lua_State *L, int index)
+{
+	v3f pos;
+	luaL_checktype(L, index, LUA_TTABLE);
+	lua_getfield(L, index, "x");
+	pos.X = luaL_checknumber(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "y");
+	pos.Y = luaL_checknumber(L, -1);
+	lua_pop(L, 1);
+	lua_getfield(L, index, "z");
+	pos.Z = luaL_checknumber(L, -1);
+	lua_pop(L, 1);
+	return pos;
+}
+
+void pushFloatPos(lua_State *L, v3f p)
+{
+	p /= BS;
+	push_v3f(L, p);
+}
+
+v3f checkFloatPos(lua_State *L, int index)
+{
+	return check_v3f(L, index) * BS;
+}
+
+void push_v3s16(lua_State *L, v3s16 p)
+{
+	lua_newtable(L);
+	lua_pushnumber(L, p.X);
+	lua_setfield(L, -2, "x");
+	lua_pushnumber(L, p.Y);
+	lua_setfield(L, -2, "y");
+	lua_pushnumber(L, p.Z);
+	lua_setfield(L, -2, "z");
+}
+
+v3s16 read_v3s16(lua_State *L, int index)
+{
+	// Correct rounding at <0
+	v3f pf = read_v3f(L, index);
+	return floatToInt(pf, 1.0);
+}
+
+v3s16 check_v3s16(lua_State *L, int index)
+{
+	// Correct rounding at <0
+	v3f pf = check_v3f(L, index);
+	return floatToInt(pf, 1.0);
+}
+
+video::SColor readARGB8(lua_State *L, int index)
+{
+	video::SColor color(0);
+	luaL_checktype(L, index, LUA_TTABLE);
+	lua_getfield(L, index, "a");
+	if(lua_isnumber(L, -1))
+		color.setAlpha(lua_tonumber(L, -1));
+	lua_pop(L, 1);
+	lua_getfield(L, index, "r");
+	color.setRed(lua_tonumber(L, -1));
+	lua_pop(L, 1);
+	lua_getfield(L, index, "g");
+	color.setGreen(lua_tonumber(L, -1));
+	lua_pop(L, 1);
+	lua_getfield(L, index, "b");
+	color.setBlue(lua_tonumber(L, -1));
+	lua_pop(L, 1);
+	return color;
+}
+
+aabb3f read_aabb3f(lua_State *L, int index, f32 scale)
+{
+	aabb3f box;
+	if(lua_istable(L, index)){
+		lua_rawgeti(L, index, 1);
+		box.MinEdge.X = lua_tonumber(L, -1) * scale;
+		lua_pop(L, 1);
+		lua_rawgeti(L, index, 2);
+		box.MinEdge.Y = lua_tonumber(L, -1) * scale;
+		lua_pop(L, 1);
+		lua_rawgeti(L, index, 3);
+		box.MinEdge.Z = lua_tonumber(L, -1) * scale;
+		lua_pop(L, 1);
+		lua_rawgeti(L, index, 4);
+		box.MaxEdge.X = lua_tonumber(L, -1) * scale;
+		lua_pop(L, 1);
+		lua_rawgeti(L, index, 5);
+		box.MaxEdge.Y = lua_tonumber(L, -1) * scale;
+		lua_pop(L, 1);
+		lua_rawgeti(L, index, 6);
+		box.MaxEdge.Z = lua_tonumber(L, -1) * scale;
+		lua_pop(L, 1);
+	}
+	return box;
+}
+
+std::vector<aabb3f> read_aabb3f_vector(lua_State *L, int index, f32 scale)
+{
+	std::vector<aabb3f> boxes;
+	if(lua_istable(L, index)){
+		int n = lua_objlen(L, index);
+		// Check if it's a single box or a list of boxes
+		bool possibly_single_box = (n == 6);
+		for(int i = 1; i <= n && possibly_single_box; i++){
+			lua_rawgeti(L, index, i);
+			if(!lua_isnumber(L, -1))
+				possibly_single_box = false;
+			lua_pop(L, 1);
+		}
+		if(possibly_single_box){
+			// Read a single box
+			boxes.push_back(read_aabb3f(L, index, scale));
+		} else {
+			// Read a list of boxes
+			for(int i = 1; i <= n; i++){
+				lua_rawgeti(L, index, i);
+				boxes.push_back(read_aabb3f(L, -1, scale));
+				lua_pop(L, 1);
+			}
+		}
+	}
+	return boxes;
+}
+
+/*
+	Table field getters
+*/
+
+bool getstringfield(lua_State *L, int table,
+		const char *fieldname, std::string &result)
+{
+	lua_getfield(L, table, fieldname);
+	bool got = false;
+	if(lua_isstring(L, -1)){
+		size_t len = 0;
+		const char *ptr = lua_tolstring(L, -1, &len);
+		result.assign(ptr, len);
+		got = true;
+	}
+	lua_pop(L, 1);
+	return got;
+}
+
+bool getintfield(lua_State *L, int table,
+		const char *fieldname, int &result)
+{
+	lua_getfield(L, table, fieldname);
+	bool got = false;
+	if(lua_isnumber(L, -1)){
+		result = lua_tonumber(L, -1);
+		got = true;
+	}
+	lua_pop(L, 1);
+	return got;
+}
+
+bool getfloatfield(lua_State *L, int table,
+		const char *fieldname, float &result)
+{
+	lua_getfield(L, table, fieldname);
+	bool got = false;
+	if(lua_isnumber(L, -1)){
+		result = lua_tonumber(L, -1);
+		got = true;
+	}
+	lua_pop(L, 1);
+	return got;
+}
+
+bool getboolfield(lua_State *L, int table,
+		const char *fieldname, bool &result)
+{
+	lua_getfield(L, table, fieldname);
+	bool got = false;
+	if(lua_isboolean(L, -1)){
+		result = lua_toboolean(L, -1);
+		got = true;
+	}
+	lua_pop(L, 1);
+	return got;
+}
+
+std::string checkstringfield(lua_State *L, int table,
+		const char *fieldname)
+{
+	lua_getfield(L, table, fieldname);
+	std::string s = luaL_checkstring(L, -1);
+	lua_pop(L, 1);
+	return s;
+}
+
+std::string getstringfield_default(lua_State *L, int table,
+		const char *fieldname, const std::string &default_)
+{
+	std::string result = default_;
+	getstringfield(L, table, fieldname, result);
+	return result;
+}
+
+int getintfield_default(lua_State *L, int table,
+		const char *fieldname, int default_)
+{
+	int result = default_;
+	getintfield(L, table, fieldname, result);
+	return result;
+}
+
+float getfloatfield_default(lua_State *L, int table,
+		const char *fieldname, float default_)
+{
+	float result = default_;
+	getfloatfield(L, table, fieldname, result);
+	return result;
+}
+
+bool getboolfield_default(lua_State *L, int table,
+		const char *fieldname, bool default_)
+{
+	bool result = default_;
+	getboolfield(L, table, fieldname, result);
+	return result;
+}
+
+void setintfield(lua_State *L, int table,
+		const char *fieldname, int value)
+{
+	lua_pushinteger(L, value);
+	if(table < 0)
+		table -= 1;
+	lua_setfield(L, table, fieldname);
+}
+
+void setfloatfield(lua_State *L, int table,
+		const char *fieldname, float value)
+{
+	lua_pushnumber(L, value);
+	if(table < 0)
+		table -= 1;
+	lua_setfield(L, table, fieldname);
+}
+
+void setboolfield(lua_State *L, int table,
+		const char *fieldname, bool value)
+{
+	lua_pushboolean(L, value);
+	if(table < 0)
+		table -= 1;
+	lua_setfield(L, table, fieldname);
+}
+
+
diff --git a/src/script/common/c_converter.h b/src/script/common/c_converter.h
new file mode 100644
index 000000000..ab0083124
--- /dev/null
+++ b/src/script/common/c_converter.h
@@ -0,0 +1,96 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+*/
+
+
+/******************************************************************************/
+/******************************************************************************/
+/* WARNING!!!! do NOT add this header in any include file or any code file    */
+/*             not being a script/modapi file!!!!!!!!                         */
+/******************************************************************************/
+/******************************************************************************/
+#ifndef C_CONVERTER_H_
+#define C_CONVERTER_H_
+
+#include <vector>
+#include <map>
+
+#include "irrlichttypes_bloated.h"
+#include "common/c_types.h"
+
+extern "C" {
+#include <lua.h>
+}
+
+std::string        getstringfield_default        (lua_State *L, int table,
+                             const char *fieldname, const std::string &default_);
+bool               getboolfield_default(lua_State *L, int table,
+                             const char *fieldname, bool default_);
+float              getfloatfield_default(lua_State *L, int table,
+                             const char *fieldname, float default_);
+int                getintfield_default           (lua_State *L, int table,
+                             const char *fieldname, int default_);
+
+bool               getstringfield(lua_State *L, int table,
+                             const char *fieldname, std::string &result);
+bool               getintfield(lua_State *L, int table,
+                             const char *fieldname, int &result);
+void               read_groups                   (lua_State *L, int index,
+                             std::map<std::string, int> &result);
+bool               getboolfield(lua_State *L, int table,
+                             const char *fieldname, bool &result);
+bool               getfloatfield(lua_State *L, int table,
+                             const char *fieldname, float &result);
+
+std::string        checkstringfield(lua_State *L, int table,
+                             const char *fieldname);
+
+void               setintfield(lua_State *L, int table,
+                             const char *fieldname, int value);
+void               setfloatfield(lua_State *L, int table,
+                             const char *fieldname, float value);
+void               setboolfield(lua_State *L, int table,
+                             const char *fieldname, bool value);
+
+
+v3f           checkFloatPos             (lua_State *L, int index);
+v3f           check_v3f                 (lua_State *L, int index);
+v3s16         check_v3s16               (lua_State *L, int index);
+
+v3f           read_v3f                  (lua_State *L, int index);
+v2f           read_v2f                  (lua_State *L, int index);
+v2s16         read_v2s16                (lua_State *L, int index);
+video::SColor readARGB8                 (lua_State *L, int index);
+aabb3f        read_aabb3f               (lua_State *L, int index, f32 scale);
+v3s16         read_v3s16                (lua_State *L, int index);
+std::vector<aabb3f>
+              read_aabb3f_vector        (lua_State *L, int index, f32 scale);
+
+void          push_v3s16                (lua_State *L, v3s16 p);
+void          pushFloatPos              (lua_State *L, v3f p);
+void          push_v3f                  (lua_State *L, v3f p);
+void          push_v2f                  (lua_State *L, v2f p);
+
+
+
+void               warn_if_field_exists      (lua_State *L,
+                                              int table,
+                                              const char *fieldname,
+                                              const std::string &message);
+
+#endif /* C_CONVERTER_H_ */
diff --git a/src/script/common/c_internal.cpp b/src/script/common/c_internal.cpp
new file mode 100644
index 000000000..42e9fb3e1
--- /dev/null
+++ b/src/script/common/c_internal.cpp
@@ -0,0 +1,65 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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 "common/c_internal.h"
+#include "server.h"
+#include "cpp_api/scriptapi.h"
+
+ScriptApi* get_scriptapi(lua_State *L)
+{
+	// Get server from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "scriptapi");
+	ScriptApi* sapi_ptr = (ScriptApi*) lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	return sapi_ptr;
+}
+
+std::string script_get_backtrace(lua_State *L)
+{
+	std::string s;
+	lua_getfield(L, LUA_GLOBALSINDEX, "debug");
+	if(lua_istable(L, -1)){
+		lua_getfield(L, -1, "traceback");
+		if(lua_isfunction(L, -1)){
+			lua_call(L, 0, 1);
+			if(lua_isstring(L, -1)){
+				s += lua_tostring(L, -1);
+			}
+			lua_pop(L, 1);
+		}
+		else{
+			lua_pop(L, 1);
+		}
+	}
+	lua_pop(L, 1);
+	return s;
+}
+
+void script_error(lua_State* L,const char *fmt, ...)
+{
+	va_list argp;
+	va_start(argp, fmt);
+	char buf[10000];
+	vsnprintf(buf, 10000, fmt, argp);
+	va_end(argp);
+	//errorstream<<"SCRIPT ERROR: "<<buf;
+	throw LuaError(L, buf);
+}
+
+
diff --git a/src/script/common/c_internal.h b/src/script/common/c_internal.h
new file mode 100644
index 000000000..dafde5843
--- /dev/null
+++ b/src/script/common/c_internal.h
@@ -0,0 +1,60 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+*/
+
+/******************************************************************************/
+/******************************************************************************/
+/* WARNING!!!! do NOT add this header in any include file or any code file    */
+/*             not being a modapi file!!!!!!!!                                */
+/******************************************************************************/
+/******************************************************************************/
+
+#ifndef C_INTERNAL_H_
+#define C_INTERNAL_H_
+
+class Server;
+class ScriptApi;
+#include <iostream>
+
+#include "lua_api/l_base.h"
+
+extern "C" {
+#include "lua.h"
+}
+
+#define luamethod(class, name) {#name, class::l_##name}
+#define STACK_TO_SERVER(L) get_scriptapi(L)->getServer()
+#define API_FCT(name) registerFunction(L,#name,l_##name,top)
+
+#define REGISTER_LUA_REF(cln)                                                  \
+class ModApi_##cln : public ModApiBase {                                       \
+	public:                                                                    \
+		ModApi_##cln() : ModApiBase() {};                                      \
+		bool Initialize(lua_State* L, int top) {                               \
+			cln::Register(L);                                                  \
+			return true;                                                       \
+		};                                                                     \
+};                                                                             \
+ModApi_##cln macro_generated_prototype__##cln;
+
+
+ScriptApi*  get_scriptapi          (lua_State *L);
+std::string script_get_backtrace   (lua_State *L);
+void        script_error           (lua_State *L, const char *fmt, ...);
+
+#endif /* C_INTERNAL_H_ */
diff --git a/src/script/common/c_types.cpp b/src/script/common/c_types.cpp
new file mode 100644
index 000000000..ac724c42c
--- /dev/null
+++ b/src/script/common/c_types.cpp
@@ -0,0 +1,40 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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 <iostream>
+
+#include "common/c_types.h"
+#include "common/c_internal.h"
+#include "itemdef.h"
+
+LuaError::LuaError(lua_State *L, const std::string &s)
+{
+	m_s = "LuaError: ";
+	m_s += s + "\n";
+	m_s += script_get_backtrace(L);
+}
+
+struct EnumString es_ItemType[] =
+	{
+		{ITEM_NONE, "none"},
+		{ITEM_NODE, "node"},
+		{ITEM_CRAFT, "craft"},
+		{ITEM_TOOL, "tool"},
+		{0, NULL},
+	};
diff --git a/src/script/common/c_types.h b/src/script/common/c_types.h
new file mode 100644
index 000000000..7df869432
--- /dev/null
+++ b/src/script/common/c_types.h
@@ -0,0 +1,90 @@
+/*
+Minetest
+Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+
+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.
+*/
+
+#ifndef C_TYPES_H_
+#define C_TYPES_H_
+
+extern "C" {
+#include "lua.h"
+}
+
+#include <iostream>
+
+struct EnumString
+{
+	int num;
+	const char *str;
+};
+
+class StackUnroller
+{
+private:
+	lua_State *m_lua;
+	int m_original_top;
+public:
+	StackUnroller(lua_State *L):
+		m_lua(L),
+		m_original_top(-1)
+	{
+		m_original_top = lua_gettop(m_lua); // store stack height
+	}
+	~StackUnroller()
+	{
+		lua_settop(m_lua, m_original_top); // restore stack height
+	}
+};
+
+class ModNameStorer
+{
+private:
+	lua_State *L;
+public:
+	ModNameStorer(lua_State *L_, const std::string modname):
+		L(L_)
+	{
+		// Store current modname in registry
+		lua_pushstring(L, modname.c_str());
+		lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
+	}
+	~ModNameStorer()
+	{
+		// Clear current modname in registry
+		lua_pushnil(L);
+		lua_setfield(L, LUA_REGISTRYINDEX, "minetest_current_modname");
+	}
+};
+
+class LuaError : public std::exception
+{
+public:
+	LuaError(lua_State *L, const std::string &s);
+
+	virtual ~LuaError() throw()
+	{}
+	virtual const char * what() const throw()
+	{
+		return m_s.c_str();
+	}
+	std::string m_s;
+};
+
+
+extern EnumString es_ItemType[];
+
+#endif /* C_TYPES_H_ */