/// <summary>
/// Checks if a specified library with the given version is available and failes
/// if the version is not installed or not present with the given version.
/// **NOTE**: This method is a quick hack, it is neither efficient nor error perfect.
/// </summary>
/// <param name="state"></param>
/// <returns></returns>
public static int Require(IntPtr state)
{
LuaFunctionArgs arg = new LuaFunctionArgs(state);
LuaTable lib = null;
string library = null;
string version = null;
string libversion = null;
bool result = false;
int index = 0;
string error = null;
if ((arg.ArgumentCount == 0 ||
arg.ArgumentCount > 2) ||
(arg.GetArgumentType(0) == LuaType.String &&
arg.GetArgumentType(1) == LuaType.String ) )
{ // Invalid arguments
throw new LuaException("Invalid arguments for require()");
}
library = (string)arg[0];
if (arg.ArgumentCount == 2)
{ // We have also a version to chekc
version = (string)arg[1];
}
try
{
index = (int)arg.State.Tables.Global.GetValue(library);
lib = new LuaTable(arg.State, index);
}
catch (Exception)
{
error = string.Format("script requires the module {0}.", library);
throw new LuaException(error);
}
if (lib != null)
{ // Library not found
if (version == null)
{ // Library found, we do not care about a version
result = true;
}
else
{ // Retrieve the version information
libversion = (string)lib.GetValue("__version");
result = (libversion == version);
}
}
if (!result)
{
if (version == null)
{ // We only require a library
error = string.Format("script requires the module {0}.", library);
throw new LuaException(error);
}
else
{ // And a version
error = string.Format("script requires the module {0} with version {1} but version {1} is installed.", library, libversion, version);
throw new LuaException(error);
}
}
return arg.EndMethod();
}
/// <summary>
/// Constructs a new table collection from the given state.
/// </summary>
/// <param name="state">State</param>
public LuaTables(LuaState state)
{
if (state == null)
{ // state must not be null
throw new ArgumentNullException("state");
}
this.state = state;
// Special ones
registry = new LuaTable(state, (int)SpecialTables.Registry);
global = new LuaTable(state, (int)SpecialTables.Global);
}