/*
* Gets the CLR object in the index positon of the Lua stack. Returns
* delegates as is.
*/
internal object getRawNetObject(LuaCore.lua_State luaState, int index)
{
int udata = LuaLib.luanet_rawnetobj(luaState, index);
return(udata != -1 ? objects[udata] : null);
}
/*
* Gets the function in the index positon of the Lua stack.
*/
internal LuaFunction getFunction(LuaCore.lua_State luaState, int index)
{
LuaLib.lua_pushvalue(luaState, index);
return(new LuaFunction(LuaLib.lua_ref(luaState, 1), interpreter));
}
/*
* Gets the CLR object in the index positon of the Lua stack. Returns
* delegates as Lua functions.
*/
internal object getNetObject(LuaCore.lua_State luaState, int index)
{
int idx = LuaLib.luanet_tonetobject(luaState, index);
return(idx != -1 ? objects[idx] : null);
}
/*
* Gets the table in the index positon of the Lua stack.
*/
internal LuaTable getTable(LuaCore.lua_State luaState, int index)
{
LuaLib.lua_pushvalue(luaState, index);
return(new LuaTable(LuaLib.lua_ref(luaState, 1), interpreter));
}
/*
* Gets the userdata in the index positon of the Lua stack.
*/
internal LuaUserData getUserData(LuaCore.lua_State luaState, int index)
{
LuaLib.lua_pushvalue(luaState, index);
return(new LuaUserData(LuaLib.lua_ref(luaState, 1), interpreter));
}
/*
* Matches a method against its arguments in the Lua stack. Returns
* if the match was succesful. It it was also returns the information
* necessary to invoke the method.
*/
internal bool matchParameters(LuaCore.lua_State luaState, MethodBase method, ref MethodCache methodCache)
{
ExtractValue extractValue;
bool isMethod = true;
var paramInfo = method.GetParameters();
int currentLuaParam = 1;
int nLuaParams = LuaLib.lua_gettop(luaState);
var paramList = new ArrayList();
var outList = new List <int>();
var argTypes = new List <MethodArgs>();
foreach (var currentNetParam in paramInfo)
{
if (!currentNetParam.IsIn && currentNetParam.IsOut) // Skips out params
{
outList.Add(paramList.Add(null));
}
else if (currentLuaParam > nLuaParams) // Adds optional parameters
{
if (currentNetParam.IsOptional)
{
paramList.Add(currentNetParam.DefaultValue);
}
else
{
isMethod = false;
break;
}
}
else if (_IsTypeCorrect(luaState, currentLuaParam, currentNetParam, out extractValue)) // Type checking
{
int index = paramList.Add(extractValue(luaState, currentLuaParam));
var methodArg = new MethodArgs();
methodArg.index = index;
methodArg.extractValue = extractValue;
argTypes.Add(methodArg);
if (currentNetParam.ParameterType.IsByRef)
{
outList.Add(index);
}
currentLuaParam++;
} // Type does not match, ignore if the parameter is optional
else if (_IsParamsArray(luaState, currentLuaParam, currentNetParam, out extractValue))
{
object luaParamValue = extractValue(luaState, currentLuaParam);
var paramArrayType = currentNetParam.ParameterType.GetElementType();
Array paramArray;
if (luaParamValue is LuaTable)
{
var table = (LuaTable)luaParamValue;
var tableEnumerator = table.GetEnumerator();
paramArray = Array.CreateInstance(paramArrayType, table.Values.Count);
tableEnumerator.Reset();
int paramArrayIndex = 0;
while (tableEnumerator.MoveNext())
{
paramArray.SetValue(Convert.ChangeType(tableEnumerator.Value, currentNetParam.ParameterType.GetElementType()), paramArrayIndex);
paramArrayIndex++;
}
}
else
{
paramArray = Array.CreateInstance(paramArrayType, 1);
paramArray.SetValue(luaParamValue, 0);
}
int index = paramList.Add(paramArray);
var methodArg = new MethodArgs();
methodArg.index = index;
methodArg.extractValue = extractValue;
methodArg.isParamsArray = true;
methodArg.paramsArrayType = paramArrayType;
argTypes.Add(methodArg);
currentLuaParam++;
}
else if (currentNetParam.IsOptional)
{
paramList.Add(currentNetParam.DefaultValue);
}
else // No match
{
isMethod = false;
break;
}
}
if (currentLuaParam != nLuaParams + 1) // Number of parameters does not match
{
isMethod = false;
}
if (isMethod)
{
methodCache.args = paramList.ToArray();
methodCache.cachedMethod = method;
methodCache.outList = outList.ToArray();
methodCache.argTypes = argTypes.ToArray();
}
return(isMethod);
}
/*
* __call metafunction of CLR delegates, retrieves and calls the delegate.
*/
private int runFunctionDelegate(LuaCore.lua_State luaState)
{
LuaCore.lua_CFunction func = (LuaCore.lua_CFunction)translator.getRawNetObject(luaState, 1);
LuaLib.lua_remove(luaState, 1);
return(func(luaState));
}
/*
* __newindex metafunction of CLR objects. Receives the object,
* the member name and the value to be stored as arguments. Throws
* and error if the assignment is invalid.
*/
private int setFieldOrProperty(LuaCore.lua_State luaState)
{
object target = translator.getRawNetObject(luaState, 1);
if (target.IsNull())
{
translator.throwError(luaState, "trying to index and invalid object reference");
return(0);
}
var type = target.GetType();
// First try to look up the parameter as a property name
string detailMessage;
bool didMember = trySetMember(luaState, type, target, BindingFlags.Instance | BindingFlags.IgnoreCase, out detailMessage);
if (didMember)
{
return(0); // Must have found the property name
}
// We didn't find a property name, now see if we can use a [] style this accessor to set array contents
try
{
if (type.IsArray && LuaLib.lua_isnumber(luaState, 2))
{
int index = (int)LuaLib.lua_tonumber(luaState, 2);
var arr = (Array)target;
object val = translator.getAsType(luaState, 3, arr.GetType().GetElementType());
arr.SetValue(val, index);
}
else
{
// Try to see if we have a this[] accessor
var setter = type.GetMethod("set_Item");
if (!setter.IsNull())
{
var args = setter.GetParameters();
var valueType = args[1].ParameterType;
// The new val ue the user specified
object val = translator.getAsType(luaState, 3, valueType);
var indexType = args[0].ParameterType;
object index = translator.getAsType(luaState, 2, indexType);
object[] methodArgs = new object[2];
// Just call the indexer - if out of bounds an exception will happen
methodArgs[0] = index;
methodArgs[1] = val;
setter.Invoke(target, methodArgs);
}
else
{
translator.throwError(luaState, detailMessage); // Pass the original message from trySetMember because it is probably best
}
}
}
catch (SEHException)
{
// If we are seeing a C++ exception - this must actually be for Lua's private use. Let it handle it
throw;
}
catch (Exception e)
{
ThrowError(luaState, e);
}
return(0);
}
/// <summary>
/// Tries to set a named property or field
/// </summary>
/// <param name="luaState"></param>
/// <param name="targetType"></param>
/// <param name="target"></param>
/// <param name="bindingType"></param>
/// <returns>false if unable to find the named member, true for success</returns>
private bool trySetMember(LuaCore.lua_State luaState, IReflect targetType, object target, BindingFlags bindingType, out string detailMessage)
{
detailMessage = null; // No error yet
// If not already a string just return - we don't want to call tostring - which has the side effect of
// changing the lua typecode to string
// Note: We don't use isstring because the standard lua C isstring considers either strings or numbers to
// be true for isstring.
if (LuaLib.lua_type(luaState, 2) != LuaTypes.String)
{
detailMessage = "property names must be strings";
return(false);
}
// We only look up property names by string
string fieldName = LuaLib.lua_tostring(luaState, 2).ToString();
if (fieldName.IsNull() || fieldName.Length < 1 || !(char.IsLetter(fieldName[0]) || fieldName[0] == '_'))
{
detailMessage = "invalid property name";
return(false);
}
// Find our member via reflection or the cache
var member = (MemberInfo)checkMemberCache(memberCache, targetType, fieldName);
if (member.IsNull())
{
//CP: Removed NonPublic binding search and made case insensitive
var members = targetType.GetMember(fieldName, bindingType | BindingFlags.Public | BindingFlags.IgnoreCase /*| BindingFlags.NonPublic*/);
if (members.Length > 0)
{
member = members[0];
setMemberCache(memberCache, targetType, fieldName, member);
}
else
{
detailMessage = "field or property '" + fieldName + "' does not exist";
return(false);
}
}
if (member.MemberType == MemberTypes.Field)
{
var field = (FieldInfo)member;
object val = translator.getAsType(luaState, 3, field.FieldType);
try
{
field.SetValue(target, val);
}
catch (Exception e)
{
ThrowError(luaState, e);
}
// We did a call
return(true);
}
else if (member.MemberType == MemberTypes.Property)
{
var property = (PropertyInfo)member;
object val = translator.getAsType(luaState, 3, property.PropertyType);
try
{
property.SetValue(target, val, null);
}
catch (Exception e)
{
ThrowError(luaState, e);
}
// We did a call
return(true);
}
detailMessage = "'" + fieldName + "' is not a .net field or property";
return(false);
}
/*
* 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(LuaCore.lua_State luaState)
{
object obj = translator.getRawNetObject(luaState, 1);
if (obj.IsNull())
{
translator.throwError(luaState, "trying to index an invalid object reference");
LuaLib.lua_pushnil(luaState);
return(1);
}
object index = translator.getObject(luaState, 2);
//var indexType = index.GetType();
string methodName = index as string; // will be null if not a string arg
var 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.IsNull() && 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)
{
int intIndex = (int)((double)index);
if (objType.UnderlyingSystemType == typeof(float[]))
{
float[] arr = ((float[])obj);
translator.push(luaState, arr[intIndex]);
}
else if (objType.UnderlyingSystemType == typeof(double[]))
{
double[] arr = ((double[])obj);
translator.push(luaState, arr[intIndex]);
}
else if (objType.UnderlyingSystemType == typeof(int[]))
{
int[] arr = ((int[])obj);
translator.push(luaState, arr[intIndex]);
}
else
{
object[] arr = (object[])obj;
translator.push(luaState, arr[intIndex]);
}
}
else
{
// Try to use get_Item to index into this .net object
//MethodInfo getter = objType.GetMethod("get_Item");
var methods = objType.GetMethods();
foreach (var mInfo in methods)
{
if (mInfo.Name == "get_Item")
{
//check if the signature matches the input
if (mInfo.GetParameters().Length == 1)
{
var getter = mInfo;
var actualParms = (!getter.IsNull()) ? getter.GetParameters() : null;
if (actualParms.IsNull() || actualParms.Length != 1)
{
translator.throwError(luaState, "method not found (or no indexer): " + index);
LuaLib.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);
}
LuaLib.lua_pushnil(luaState);
}
}
}
}
}
}
LuaLib.lua_pushboolean(luaState, false);
return(2);
}
/*
* Pushes the value of a member or a delegate to call it, depending on the type of
* the member. Works with static or instance members.
* Uses reflection to find members, and stores the reflected MemberInfo object in
* a cache (indexed by the type of the object and the name of the member).
*/
private int getMember(LuaCore.lua_State luaState, IReflect objType, object obj, string methodName, BindingFlags bindingType)
{
bool implicitStatic = false;
MemberInfo member = null;
object cachedMember = checkMemberCache(memberCache, objType, methodName);
//object cachedMember=null;
if (cachedMember is LuaCore.lua_CFunction)
{
translator.pushFunction(luaState, (LuaCore.lua_CFunction)cachedMember);
translator.push(luaState, true);
return(2);
}
else if (!cachedMember.IsNull())
{
member = (MemberInfo)cachedMember;
}
else
{
//CP: Removed NonPublic binding search
var members = objType.GetMember(methodName, bindingType | BindingFlags.Public | BindingFlags.IgnoreCase /*| BindingFlags.NonPublic*/);
if (members.Length > 0)
{
member = members[0];
}
else
{
// If we can't find any suitable instance members, try to find them as statics - but we only want to allow implicit static
// lookups for fields/properties/events -kevinh
//CP: Removed NonPublic binding search and made case insensitive
members = objType.GetMember(methodName, bindingType | BindingFlags.Static | BindingFlags.Public | BindingFlags.IgnoreCase /*| BindingFlags.NonPublic*/);
if (members.Length > 0)
{
member = members[0];
implicitStatic = true;
}
}
}
if (!member.IsNull())
{
if (member.MemberType == MemberTypes.Field)
{
var field = (FieldInfo)member;
if (cachedMember.IsNull())
{
setMemberCache(memberCache, objType, methodName, member);
}
try
{
translator.push(luaState, field.GetValue(obj));
}
catch
{
LuaLib.lua_pushnil(luaState);
}
}
else if (member.MemberType == MemberTypes.Property)
{
var property = (PropertyInfo)member;
if (cachedMember.IsNull())
{
setMemberCache(memberCache, objType, methodName, member);
}
try
{
object val = property.GetValue(obj, null);
translator.push(luaState, val);
}
catch (ArgumentException)
{
// If we can't find the getter in our class, recurse up to the base class and see
// if they can help.
if (objType is Type && !(((Type)objType) == typeof(object)))
{
return(getMember(luaState, ((Type)objType).BaseType, obj, methodName, bindingType));
}
else
{
LuaLib.lua_pushnil(luaState);
}
}
catch (TargetInvocationException e) // Convert this exception into a Lua error
{
ThrowError(luaState, e);
LuaLib.lua_pushnil(luaState);
}
}
else if (member.MemberType == MemberTypes.Event)
{
var eventInfo = (EventInfo)member;
if (cachedMember.IsNull())
{
setMemberCache(memberCache, objType, methodName, member);
}
translator.push(luaState, new RegisterEventHandler(translator.pendingEvents, obj, eventInfo));
}
else if (!implicitStatic)
{
if (member.MemberType == MemberTypes.NestedType)
{
// kevinh - added support for finding nested types
// cache us
if (cachedMember.IsNull())
{
setMemberCache(memberCache, objType, methodName, member);
}
// Find the name of our class
string name = member.Name;
var dectype = member.DeclaringType;
// Build a new long name and try to find the type by name
string longname = dectype.FullName + "+" + name;
var nestedType = translator.FindType(longname);
translator.pushType(luaState, nestedType);
}
else
{
// Member type must be 'method'
var wrapper = new LuaCore.lua_CFunction((new LuaMethodWrapper(translator, objType, methodName, bindingType)).call);
if (cachedMember.IsNull())
{
setMemberCache(memberCache, objType, methodName, wrapper);
}
translator.pushFunction(luaState, wrapper);
translator.push(luaState, true);
return(2);
}
}
else
{
// If we reach this point we found a static method, but can't use it in this context because the user passed in an instance
translator.throwError(luaState, "can't pass instance to static method " + methodName);
LuaLib.lua_pushnil(luaState);
}
}
else
{
// kevinh - we want to throw an exception because meerly returning 'nil' in this case
// is not sufficient. valid data members may return nil and therefore there must be some
// way to know the member just doesn't exist.
translator.throwError(luaState, "unknown member name " + methodName);
LuaLib.lua_pushnil(luaState);
}
// push false because we are NOT returning a function (see luaIndexFunction)
translator.push(luaState, false);
return(2);
}
internal ExtractValue checkType(LuaCore.lua_State luaState, int stackPos, Type paramType)
{
var luatype = LuaLib.lua_type(luaState, stackPos);
if (paramType.IsByRef)
{
paramType = paramType.GetElementType();
}
var underlyingType = Nullable.GetUnderlyingType(paramType);
if (!underlyingType.IsNull())
{
paramType = underlyingType; // Silently convert nullable types to their non null requics
}
long runtimeHandleValue = paramType.TypeHandle.Value.ToInt64();
if (paramType.Equals(typeof(object)))
{
return(extractValues[runtimeHandleValue]);
}
//CP: Added support for generic parameters
if (paramType.IsGenericParameter)
{
if (luatype == LuaTypes.Boolean)
{
return(extractValues[typeof(bool).TypeHandle.Value.ToInt64()]);
}
else if (luatype == LuaTypes.String)
{
return(extractValues[typeof(string).TypeHandle.Value.ToInt64()]);
}
else if (luatype == LuaTypes.Table)
{
return(extractValues[typeof(LuaTable).TypeHandle.Value.ToInt64()]);
}
else if (luatype == LuaTypes.UserData)
{
return(extractValues[typeof(object).TypeHandle.Value.ToInt64()]);
}
else if (luatype == LuaTypes.Function)
{
return(extractValues[typeof(LuaFunction).TypeHandle.Value.ToInt64()]);
}
else if (luatype == LuaTypes.Number)
{
return(extractValues[typeof(double).TypeHandle.Value.ToInt64()]);
}
//else
//;//an unsupported type was encountered
}
if (LuaLib.lua_isnumber(luaState, stackPos))
{
return(extractValues[runtimeHandleValue]);
}
if (paramType == typeof(bool))
{
if (LuaLib.lua_isboolean(luaState, stackPos))
{
return(extractValues[runtimeHandleValue]);
}
}
else if (paramType == typeof(string))
{
if (LuaLib.lua_isstring(luaState, stackPos))
{
return(extractValues[runtimeHandleValue]);
}
else if (luatype == LuaTypes.Nil)
{
return(extractNetObject); // kevinh - silently convert nil to a null string pointer
}
}
else if (paramType == typeof(LuaTable))
{
if (luatype == LuaTypes.Table)
{
return(extractValues[runtimeHandleValue]);
}
}
else if (paramType == typeof(LuaUserData))
{
if (luatype == LuaTypes.UserData)
{
return(extractValues[runtimeHandleValue]);
}
}
else if (paramType == typeof(LuaFunction))
{
if (luatype == LuaTypes.Function)
{
return(extractValues[runtimeHandleValue]);
}
}
else if (typeof(Delegate).IsAssignableFrom(paramType) && luatype == LuaTypes.Function)
{
return(new ExtractValue(new DelegateGenerator(translator, paramType).extractGenerated));
}
else if (paramType.IsInterface && luatype == LuaTypes.Table)
{
return(new ExtractValue(new ClassGenerator(translator, paramType).extractGenerated));
}
else if ((paramType.IsInterface || paramType.IsClass) && luatype == LuaTypes.Nil)
{
// kevinh - allow nil to be silently converted to null - extractNetObject will return null when the item ain't found
return(extractNetObject);
}
else if (LuaLib.lua_type(luaState, stackPos) == LuaTypes.Table)
{
if (LuaLib.luaL_getmetafield(luaState, stackPos, "__index"))
{
object obj = translator.getNetObject(luaState, -1);
LuaLib.lua_settop(luaState, -2);
if (!obj.IsNull() && paramType.IsAssignableFrom(obj.GetType()))
{
return(extractNetObject);
}
}
else
{
return(null);
}
}
else
{
object obj = translator.getNetObject(luaState, stackPos);
if (!obj.IsNull() && paramType.IsAssignableFrom(obj.GetType()))
{
return(extractNetObject);
}
}
return(null);
}
private object getAsBoolean(LuaCore.lua_State luaState, int stackPos)
{
return(LuaLib.lua_toboolean(luaState, stackPos));
}
static int PanicCallback(LuaCore.lua_State luaState)
{
// string desc = LuaLib.lua_tostring(luaState, 1);
string reason = string.Format("unprotected error in call to Lua API ({0})", LuaLib.lua_tostring(luaState, -1));
// lua_tostring(L, -1);
throw new LuaException(reason);
}
/// <summary>
/// Pops a value from the lua stack.
/// </summary>
/// <returns>Returns the top value from the lua stack.</returns>
/// <author>Reinhard Ostermeier</author>
public object Pop()
{
int top = LuaLib.lua_gettop(luaState);
return(translator.popValues(luaState, top - 1)[0]);
}
/*
* Pushes the userdata into the Lua stack
*/
internal void push(LuaCore.lua_State luaState)
{
LuaLib.lua_getref(luaState, _Reference);
}