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{* UltraStar Deluxe - Karaoke Game
*
* UltraStar Deluxe is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*}
unit ULuaUtils;
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I switches.inc}
uses ULua, ULuaCore;
{ converts a lua table with a structure like:
* = 1 , * = 4 , * = 5
to an integer with the value:
0b11001
does not pop anything }
function Lua_ToBinInt(L: PLua_State; idx: Integer): Integer;
{ returns plugin that is the owner of the given state
may raise a lua error if the parent id is not found
in states registry, if state owner does not exists
or is not loaded. So a check for a nil value is not
necessary }
function Lua_GetOwner(L: PLua_State): TLuaPlugin;
{ this is a helper in case an evenet owner don't has no use for the results
returns number of popped elements }
function Lua_ClearStack(L: Plua_State): Integer;
implementation
{ converts a lua table with a structure like:
* = 1 , * = 4 , * = 5
to an integer with the value:
0b11001
does not pop anything }
function Lua_ToBinInt(L: PLua_State; idx: Integer): Integer;
var
I: Integer;
begin
// default: no bits set
Result := 0;
lua_checkstack(L, 2);
if (idx < 0) then
dec(idx); // we will push one value before using this
lua_PushNil(L);
while (lua_next(L, idx) <> 0) do
begin
if (lua_isNumber(L, -1)) then
begin //check if we got an integer value from 1 to 32
I := lua_toInteger(L, -1);
if (I >= 1) and (I <= 32) then
Result := Result or 1 shl (I - 1);
end;
// pop value, so key is on top
lua_pop(L, 1);
end;
end;
{ returns plugin that is the owner of the given state
may raise a lua error if the parent id is not found
in states registry, if state owner does not exists
or is not loaded. So a check for a nil value is not
necessary }
function Lua_GetOwner(L: PLua_State): TLuaPlugin;
begin
lua_checkstack(L, 1);
lua_getfield (L, LUA_REGISTRYINDEX, '_USDX_STATE_ID');
if (not lua_isNumber(L, -1)) then
luaL_error(L, 'unable to get _USDX_STATE_ID');
Result := LuaCore.GetPluginById(lua_toInteger(L, -1));
lua_pop(L, 1); //< remove state id from stack
if (Result = nil) then
luaL_error(L, '_USDX_STATE_ID has invalid value')
else if (Result.Status > psRunning) then
luaL_error(L, 'owning plugin is not loaded or already unloaded in Lua_GetOwner');
end;
{ this is a helper in case an evenet owner don't has no use for the results
returns number of popped elements }
function Lua_ClearStack(L: Plua_State): Integer;
begin
Result := lua_gettop(L);
lua_pop(L, Result);
end;
end.
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