1 files changed, 343 insertions, 0 deletions
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);
+}
+
+