/// <summary>
/// Assuming we have a Lua error string sitting on the stack, throw a C# exception out to the user's app
/// </summary>
/// <exception cref="LuaScriptException">Thrown if the script caused an exception</exception>
void ThrowExceptionFromError(int oldTop)
{
object err = translator.getObject(luaState, -1);
LuaDLL.lua_settop(luaState, oldTop);
// A pre-wrapped exception - just rethrow it (stack trace of InnerException will be preserved)
LuaException luaEx = err as LuaException;
if (luaEx != null)
{
throw luaEx;
}
// A non-wrapped Lua error (best interpreted as a string) - wrap it and throw it
if (err == null)
{
err = "Unknown Lua Error";
}
throw new LuaException(err.ToString());
}
public object getAsObject(SharpLua.Lua.LuaState luaState, int stackPos)
{
if (LuaDLL.lua_type(luaState, stackPos) == LuaTypes.LUA_TTABLE)
{
if (LuaDLL.luaL_getmetafield(luaState, stackPos, "__index"))
{
if (LuaDLL.luaL_checkmetatable(luaState, -1))
{
LuaDLL.lua_insert(luaState, stackPos);
LuaDLL.lua_remove(luaState, stackPos + 1);
}
else
{
LuaDLL.lua_settop(luaState, -2);
}
}
}
object obj = translator.getObject(luaState, stackPos);
return(obj);
}
/*
* Called by the __index metafunction of CLR objects in case the
* method is not cached or it is a field/property/event.
* Receives the object and the member name as arguments and returns
* either the value of the member or a delegate to call it.
* If the member does not exist returns nil.
*/
private int getMethod(SharpLua.Lua.LuaState luaState)
{
object obj = translator.getRawNetObject(luaState, 1);
if (obj == null)
{
translator.throwError(luaState, "trying to index an invalid object reference");
LuaDLL.lua_pushnil(luaState);
return(1);
}
object index = translator.getObject(luaState, 2);
Type indexType = index.GetType(); //* not used
string methodName = index as string; // will be null if not a string arg
Type objType = obj.GetType();
// Handle the most common case, looking up the method by name.
// CP: This will fail when using indexers and attempting to get a value with the same name as a property of the object,
// ie: xmlelement['item'] <- item is a property of xmlelement
try
{
if (methodName != null && isMemberPresent(objType, methodName))
{
return(getMember(luaState, objType, obj, methodName, BindingFlags.Instance | BindingFlags.IgnoreCase));
}
}
catch { }
bool failed = true;
// Try to access by array if the type is right and index is an int (lua numbers always come across as double)
if (objType.IsArray && index is double)
{
int intIndex = (int)((double)index);
Array aa = obj as Array;
if (intIndex >= aa.Length)
{
return(translator.pushError(luaState, "array index out of bounds: " + intIndex + " " + aa.Length));
}
object val = aa.GetValue(intIndex);
translator.push(luaState, val);
failed = false;
}
else
{
// Try to use get_Item to index into this .net object
//MethodInfo getter = objType.GetMethod("get_Item");
// issue here is that there may be multiple indexers..
MethodInfo[] methods = objType.GetMethods();
foreach (MethodInfo mInfo in methods)
{
if (mInfo.Name == "get_Item")
{
//check if the signature matches the input
if (mInfo.GetParameters().Length == 1)
{
MethodInfo getter = mInfo;
ParameterInfo[] actualParms = (getter != null) ? getter.GetParameters() : null;
if (actualParms == null || actualParms.Length != 1)
{
return(translator.pushError(luaState, "method not found (or no indexer): " + index));
}
else
{
// Get the index in a form acceptable to the getter
index = translator.getAsType(luaState, 2, actualParms[0].ParameterType);
// Just call the indexer - if out of bounds an exception will happen
try
{
object result = getter.Invoke(obj, new object[] { index });
translator.push(luaState, result);
failed = false;
}
catch (TargetInvocationException e)
{
// Provide a more readable description for the common case of key not found
if (e.InnerException is KeyNotFoundException)
{
return(translator.pushError(luaState, "key '" + index + "' not found "));
}
else
{
return(translator.pushError(luaState, "exception indexing '" + index + "' " + e.Message));
}
}
}
}
}
}
}
if (failed)
{
return(translator.pushError(luaState, "cannot find " + index));
}
LuaDLL.lua_pushboolean(luaState, false);
return(2);
}
