/// <summary>
/// Convert C# exceptions into Lua errors
/// </summary>
/// <returns>num of things on stack</returns>
/// <param name="e">null for no pending exception</param>
internal int SetPendingException(Exception e)
{
Exception caughtExcept = e;
if (caughtExcept != null)
{
translator.throwError(luaState, caughtExcept);
LuaDLL.lua_pushnil(luaState);
return(1);
}
else
{
return(0);
}
}
/*
* Calls the method. Receives the arguments from the Lua stack
* and returns values in it.
*/
public int call(IntPtr luaState)
{
MethodBase methodToCall = _Method;
object targetObject = _Target;
bool failedCall = true;
int nReturnValues = 0;
if (!LuaDLL.lua_checkstack(luaState, 5))
{
throw new LuaException("Lua stack overflow");
}
bool isStatic = (_BindingType & BindingFlags.Static) == BindingFlags.Static;
SetPendingException(null);
if (methodToCall == null) // Method from name
{
if (isStatic)
{
targetObject = null;
}
else
{
targetObject = _ExtractTarget(luaState, 1);
}
//LuaDLL.lua_remove(luaState,1); // Pops the receiver
if (_LastCalledMethod.cachedMethod != null) // Cached?
{
int numStackToSkip = isStatic ? 0 : 1; // If this is an instance invoe we will have an extra arg on the stack for the targetObject
int numArgsPassed = LuaDLL.lua_gettop(luaState) - numStackToSkip;
if (numArgsPassed == _LastCalledMethod.argTypes.Length) // No. of args match?
{
if (!LuaDLL.lua_checkstack(luaState, _LastCalledMethod.outList.Length + 6))
{
throw new LuaException("Lua stack overflow");
}
try
{
for (int i = 0; i < _LastCalledMethod.argTypes.Length; i++)
{
_LastCalledMethod.args[_LastCalledMethod.argTypes[i].index] =
_LastCalledMethod.argTypes[i].extractValue(luaState, i + 1 + numStackToSkip);
if (_LastCalledMethod.args[_LastCalledMethod.argTypes[i].index] == null &&
!LuaDLL.lua_isnil(luaState, i + 1 + numStackToSkip))
{
throw new LuaException("argument number " + (i + 1) + " is invalid");
}
}
if ((_BindingType & BindingFlags.Static) == BindingFlags.Static)
{
_Translator.push(luaState, _LastCalledMethod.cachedMethod.Invoke(null, _LastCalledMethod.args));
}
else
{
if (_LastCalledMethod.cachedMethod.IsConstructor)
{
_Translator.push(luaState, ((ConstructorInfo)_LastCalledMethod.cachedMethod).Invoke(_LastCalledMethod.args));
}
else
{
_Translator.push(luaState, _LastCalledMethod.cachedMethod.Invoke(targetObject, _LastCalledMethod.args));
}
}
failedCall = false;
}
catch (TargetInvocationException e)
{
// Failure of method invocation
return(SetPendingException(e.GetBaseException()));
}
catch (Exception e)
{
if (_Members.Length == 1) // Is the method overloaded?
// No, throw error
{
return(SetPendingException(e));
}
}
}
}
// Cache miss
if (failedCall)
{
// System.Diagnostics.Debug.WriteLine("cache miss on " + methodName);
// If we are running an instance variable, we can now pop the targetObject from the stack
if (!isStatic)
{
if (targetObject == null)
{
_Translator.throwError(luaState, String.Format("instance method '{0}' requires a non null target object", _MethodName));
LuaDLL.lua_pushnil(luaState);
return(1);
}
LuaDLL.lua_remove(luaState, 1); // Pops the receiver
}
bool hasMatch = false;
string candidateName = null;
foreach (MemberInfo member in _Members)
{
candidateName = member.ReflectedType.Name + "." + member.Name;
MethodBase m = (MethodInfo)member;
bool isMethod = _Translator.matchParameters(luaState, m, ref _LastCalledMethod);
if (isMethod)
{
hasMatch = true;
break;
}
}
if (!hasMatch)
{
string msg = (candidateName == null)
? "invalid arguments to method call"
: ("invalid arguments to method: " + candidateName);
_Translator.throwError(luaState, msg);
LuaDLL.lua_pushnil(luaState);
return(1);
}
}
}
else // Method from MethodBase instance
{
if (!methodToCall.IsStatic && !methodToCall.IsConstructor && targetObject == null)
{
targetObject = _ExtractTarget(luaState, 1);
LuaDLL.lua_remove(luaState, 1); // Pops the receiver
}
if (!_Translator.matchParameters(luaState, methodToCall, ref _LastCalledMethod))
{
_Translator.throwError(luaState, "invalid arguments to method call");
LuaDLL.lua_pushnil(luaState);
return(1);
}
}
if (failedCall)
{
if (!LuaDLL.lua_checkstack(luaState, _LastCalledMethod.outList.Length + 6))
{
throw new LuaException("Lua stack overflow");
}
try
{
if (isStatic)
{
_Translator.push(luaState, _LastCalledMethod.cachedMethod.Invoke(null, _LastCalledMethod.args));
}
else
{
if (_LastCalledMethod.cachedMethod.IsConstructor)
{
_Translator.push(luaState, ((ConstructorInfo)_LastCalledMethod.cachedMethod).Invoke(_LastCalledMethod.args));
}
else
{
_Translator.push(luaState, _LastCalledMethod.cachedMethod.Invoke(targetObject, _LastCalledMethod.args));
}
}
}
catch (TargetInvocationException e)
{
return(SetPendingException(e.GetBaseException()));
}
catch (Exception e)
{
return(SetPendingException(e));
}
}
// Pushes out and ref return values
for (int index = 0; index < _LastCalledMethod.outList.Length; index++)
{
nReturnValues++;
//for(int i=0;i<lastCalledMethod.outList.Length;i++)
_Translator.push(luaState, _LastCalledMethod.args[_LastCalledMethod.outList[index]]);
}
return(nReturnValues < 1 ? 1 : nReturnValues);
}
/*
* 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(IntPtr 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();
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 { }
// 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)
{
object[] arr = (object[])obj;
translator.push(luaState, arr[(int)((double)index)]);
}
else
{
// Try to use get_Item to index into this .net object
//MethodInfo getter = objType.GetMethod("get_Item");
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)
{
translator.throwError(luaState, "method not found (or no indexer): " + index);
LuaDLL.lua_pushnil(luaState);
}
else
{
// Get the index in a form acceptable to the getter
index = translator.getAsType(luaState, 2, actualParms[0].ParameterType);
object[] args = new object[1];
// Just call the indexer - if out of bounds an exception will happen
args[0] = index;
try
{
object result = getter.Invoke(obj, args);
translator.push(luaState, result);
}
catch (TargetInvocationException e)
{
// Provide a more readable description for the common case of key not found
if (e.InnerException is KeyNotFoundException)
{
translator.throwError(luaState, "key '" + index + "' not found ");
}
else
{
translator.throwError(luaState, "exception indexing '" + index + "' " + e.Message);
}
LuaDLL.lua_pushnil(luaState);
}
}
}
}
}
}
LuaDLL.lua_pushboolean(luaState, false);
return(2);
}
