1 files changed, 287 insertions, 0 deletions
diff --git a/src/scriptapi_common.cpp b/src/scriptapi_common.cpp
new file mode 100644
index 000000000..8ee8d6a84
--- /dev/null
+++ b/src/scriptapi_common.cpp
@@ -0,0 +1,287 @@
+/*
+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 "scriptapi.h"
+#include "scriptapi_common.h"
+
+extern "C" {
+#include "lauxlib.h"
+}
+
+#include "script.h"
+#include "scriptapi_types.h"
+#include "scriptapi_object.h"
+
+
+Server* get_server(lua_State *L)
+{
+	// Get server from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "minetest_server");
+	Server *server = (Server*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	return server;
+}
+
+ServerEnvironment* get_env(lua_State *L)
+{
+	// Get environment from registry
+	lua_getfield(L, LUA_REGISTRYINDEX, "minetest_env");
+	ServerEnvironment *env = (ServerEnvironment*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	return env;
+}
+
+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)){
+		infostream<<script_get_backtrace(L)<<std::endl;
+		infostream<<"WARNING: field \""<<fieldname<<"\": "
+				<<message<<std::endl;
+	}
+	lua_pop(L, 1);
+}
+
+/*
+	ToolCapabilities
+*/
+
+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);
+	return toolcap;
+}
+
+void set_tool_capabilities(lua_State *L, int table,
+		const ToolCapabilities &toolcap)
+{
+	setfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
+	setintfield(L, table, "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");
+}
+
+void push_tool_capabilities(lua_State *L,
+		const ToolCapabilities &prop)
+{
+	lua_newtable(L);
+	set_tool_capabilities(L, -1, prop);
+}
+
+void realitycheck(lua_State *L)
+{
+	int top = lua_gettop(L);
+	if(top >= 30){
+		dstream<<"Stack is over 30:"<<std::endl;
+		stackDump(L, dstream);
+		script_error(L, "Stack is over 30 (reality check)");
+	}
+}
+
+/*
+	PointedThing
+*/
+
+void push_pointed_thing(lua_State *L, const PointedThing& pointed)
+{
+	lua_newtable(L);
+	if(pointed.type == POINTEDTHING_NODE)
+	{
+		lua_pushstring(L, "node");
+		lua_setfield(L, -2, "type");
+		push_v3s16(L, pointed.node_undersurface);
+		lua_setfield(L, -2, "under");
+		push_v3s16(L, pointed.node_abovesurface);
+		lua_setfield(L, -2, "above");
+	}
+	else if(pointed.type == POINTEDTHING_OBJECT)
+	{
+		lua_pushstring(L, "object");
+		lua_setfield(L, -2, "type");
+		objectref_get(L, pointed.object_id);
+		lua_setfield(L, -2, "ref");
+	}
+	else
+	{
+		lua_pushstring(L, "nothing");
+		lua_setfield(L, -2, "type");
+	}
+}
+
+void stackDump(lua_State *L, std::ostream &o)
+{
+  int i;
+  int top = lua_gettop(L);
+  for (i = 1; i <= top; i++) {  /* repeat for each level */
+	int t = lua_type(L, i);
+	switch (t) {
+
+	  case LUA_TSTRING:  /* strings */
+	  	o<<"\""<<lua_tostring(L, i)<<"\"";
+		break;
+
+	  case LUA_TBOOLEAN:  /* booleans */
+		o<<(lua_toboolean(L, i) ? "true" : "false");
+		break;
+
+	  case LUA_TNUMBER:  /* numbers */ {
+	  	char buf[10];
+		snprintf(buf, 10, "%g", lua_tonumber(L, i));
+		o<<buf;
+		break; }
+
+	  default:  /* other values */
+		o<<lua_typename(L, t);
+		break;
+
+	}
+	o<<" ";
+  }
+  o<<std::endl;
+}
+
+#if 0
+// Dump stack top with the dump2 function
+static void dump2(lua_State *L, const char *name)
+{
+	// Dump object (debug)
+	lua_getglobal(L, "dump2");
+	luaL_checktype(L, -1, LUA_TFUNCTION);
+	lua_pushvalue(L, -2); // Get previous stack top as first parameter
+	lua_pushstring(L, name);
+	if(lua_pcall(L, 2, 0, 0))
+		script_error(L, "error: %s", lua_tostring(L, -1));
+}
+#endif
+
+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;
+}
+
+/*bool enum_to_string(const EnumString *spec, std::string &result,
+		int num)
+{
+	const EnumString *esp = spec;
+	while(esp){
+		if(num == esp->num){
+			result = esp->str;
+			return true;
+		}
+		esp++;
+	}
+	return false;
+}*/
+
+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;
+}