1 files changed, 186 insertions, 0 deletions
diff --git a/src/lua/ULuaUtils.pas b/src/lua/ULuaUtils.pas
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+++ b/src/lua/ULuaUtils.pas
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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;
+
+{ converts an integer with the value:
+    0b11001
+  to a lua table with a structure like:
+    * = 1 , * = 4 , * = 5
+  and pushed the table onto the stack }
+procedure Lua_PushBinInt(L: PLua_State; BinInt: Integer);
+
+{ pushes a table with position and size of a rectangle
+  t.x => position of the rectangle in pixels at x-axis
+  t.y => position of the rectangle in pixels at y-axis
+  t.w => width of the rectangle
+  t.h => height of the rectangle }
+procedure Lua_PushRect(L: PLua_State; X, Y, W, H: Double);
+
+{ 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;
+
+{ converts an integer with the value:
+    0b11001
+  to a lua table with a structure like:
+    * = 1 , * = 4 , * = 5
+  and pushed the table onto the stack }
+procedure Lua_PushBinInt(L: PLua_State; BinInt: Integer);
+var
+  I, Index: Integer;
+begin
+  lua_newTable(L);
+
+
+  Index := 1; //< lua starts w/ index 1
+  for I := 0 to 31 do
+    if (BinInt and (1 shl I) <> 0) then
+    begin
+      lua_pushInteger(L, Index);
+      lua_pushInteger(L, I);
+      lua_settable(L, -3);
+
+      Inc(Index);
+    end;
+end;
+
+{ pushes a table with position and size of a rectangle
+  t.x => position of the rectangle in pixels at x-axis
+  t.y => position of the rectangle in pixels at y-axis
+  t.w => width of the rectangle
+  t.h => height of the rectangle }
+procedure Lua_PushRect(L: PLua_State; X, Y, W, H: Double);
+begin
+  lua_createtable(L, 0, 4); // table w/ 4 record fields
+
+  // x pos
+  lua_pushNumber(L, X);
+  lua_setField(L, -2, 'x');
+
+  // y pos
+  lua_pushNumber(L, Y);
+  lua_setField(L, -2, 'y');
+
+  // width
+  lua_pushNumber(L, W);
+  lua_setField(L, -2, 'w');
+
+  // height
+  lua_pushNumber(L, H);
+  lua_setField(L, -2, 'h');
+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.
+\ No newline at end of file