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// Copyright © 2008-2012 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
#include "libs.h"
#include "LuaFixed.h"
#include "LuaUtils.h"
static int l_fixed_new(lua_State *L)
{
LUA_DEBUG_START(L);
int num = luaL_checkinteger(L, 1);
int denom = luaL_checkinteger(L, 2);
if (!denom)
return luaL_error(L, "cannot construct a fixed-point value with a zero denominator");
LuaFixed::PushToLua(L, fixed(num, denom));
LUA_DEBUG_END(L, 1);
return 1;
}
static int l_fixed_tostring(lua_State *L)
{
const fixed *v = LuaFixed::CheckFromLua(L, 1);
lua_pushfstring(L, "fixed(%f)", lua_Number(v->ToDouble()));
return 1;
}
static int l_fixed_add(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
LuaFixed::PushToLua(L, *a + *b);
return 1;
}
static int l_fixed_sub(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
LuaFixed::PushToLua(L, *a - *b);
return 1;
}
static int l_fixed_mul(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
LuaFixed::PushToLua(L, *a * *b);
return 1;
}
static int l_fixed_div(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
LuaFixed::PushToLua(L, *a / *b);
return 1;
}
static int l_fixed_unm(lua_State *L)
{
const fixed *v = LuaFixed::CheckFromLua(L, 1);
LuaFixed::PushToLua(L, -*v);
return 1;
}
static int l_fixed_eq(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
lua_pushboolean(L, *a == *b);
return 1;
}
static int l_fixed_lt(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
lua_pushboolean(L, *a < *b);
return 1;
}
static int l_fixed_le(lua_State *L)
{
const fixed *a = LuaFixed::CheckFromLua(L, 1);
const fixed *b = LuaFixed::CheckFromLua(L, 2);
lua_pushboolean(L, *a <= *b);
return 1;
}
static int l_fixed_tonumber(lua_State *L)
{
const fixed *v = LuaFixed::CheckFromLua(L, 1);
lua_pushnumber(L, v->ToDouble());
return 1;
}
static int l_fixed_deg2rad(lua_State *L)
{
const fixed *v = LuaFixed::CheckFromLua(L, 1);
LuaFixed::PushToLua(L, (*v) * fixed(31416,1800000));
return 1;
}
static luaL_Reg l_fixed_lib[] = {
{ "new", &l_fixed_new },
{ "deg2rad", &l_fixed_deg2rad },
{ 0, 0 }
};
static luaL_Reg l_fixed_meta[] = {
{ "__tostring", &l_fixed_tostring },
{ "__add", &l_fixed_add },
{ "__sub", &l_fixed_sub },
{ "__mul", &l_fixed_mul },
{ "__div", &l_fixed_div },
{ "__unm", &l_fixed_unm },
{ "__eq", &l_fixed_eq },
{ "__lt", &l_fixed_lt },
{ "__le", &l_fixed_le },
{ "tonumber", &l_fixed_tonumber },
{ 0, 0 }
};
const char LuaFixed::LibName[] = "fixed";
const char LuaFixed::TypeName[] = "fixed";
void LuaFixed::Register(lua_State *L)
{
LUA_DEBUG_START(L);
luaL_newlib(L, l_fixed_lib);
lua_setglobal(L, LuaFixed::LibName);
luaL_newmetatable(L, LuaFixed::TypeName);
luaL_setfuncs(L, l_fixed_meta, 0);
// hide the metatable to thwart crazy exploits
lua_pushboolean(L, 0);
lua_setfield(L, -2, "__metatable");
// map index back to the metatable
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
// pop the metatable
lua_pop(L, 1);
LUA_DEBUG_END(L, 0);
}
void LuaFixed::PushToLua(lua_State *L, const fixed &v)
{
LUA_DEBUG_START(L);
fixed *ptr = static_cast<fixed*>(lua_newuserdata(L, sizeof(fixed)));
*ptr = v;
luaL_setmetatable(L, LuaFixed::TypeName);
LUA_DEBUG_END(L, 1);
}
const fixed *LuaFixed::GetFromLua(lua_State *L, int idx)
{
return static_cast<fixed*>(luaL_testudata(L, idx, LuaFixed::TypeName));
}
const fixed *LuaFixed::CheckFromLua(lua_State *L, int idx)
{
return static_cast<fixed*>(luaL_checkudata(L, idx, LuaFixed::TypeName));
}
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