private bool evalIsExpression_WithAliases(IsExpression isExpression, AbstractType typeToCheck)
{
/*
* Note: It's needed to let the abstract ast scanner also scan through IsExpressions etc.
* in order to find aliases and/or specified template parameters!
*/
var expectedTemplateParams = new TemplateParameter[isExpression.TemplateParameterList.Length + 1];
expectedTemplateParams [0] = isExpression.ArtificialFirstSpecParam;
if(expectedTemplateParams.Length > 1)
isExpression.TemplateParameterList.CopyTo (expectedTemplateParams, 1);
var tpl_params = new DeducedTypeDictionary(expectedTemplateParams);
var tpd = new TemplateParameterDeduction(tpl_params, ctxt);
bool retTrue = false;
if (isExpression.EqualityTest) // 6.
{
// a)
if (isExpression.TypeSpecialization != null)
{
tpd.EnforceTypeEqualityWhenDeducing = true;
retTrue = tpd.Handle(isExpression.ArtificialFirstSpecParam, typeToCheck);
tpd.EnforceTypeEqualityWhenDeducing = false;
}
else // b)
{
var r = evalIsExpression_EvalSpecToken(isExpression, typeToCheck, true);
retTrue = r.Item1;
tpl_params[isExpression.TypeAliasIdentifierHash] = new TemplateParameterSymbol(null, r.Item2);
}
}
else // 5.
retTrue = tpd.Handle(isExpression.ArtificialFirstSpecParam, typeToCheck);
if (retTrue && isExpression.TemplateParameterList != null)
foreach (var p in isExpression.TemplateParameterList)
if (!tpd.Handle(p, tpl_params[p.NameHash] != null ? tpl_params[p.NameHash].Base : null))
return false;
//TODO: Put all tpl_params results into the resolver context or make a new scope or something!
return retTrue;
}
ISemantic E(PostfixExpression_MethodCall call, bool returnBaseTypeOnly=true)
{
// Deduce template parameters later on
AbstractType[] baseExpression;
ISymbolValue baseValue;
TemplateInstanceExpression tix;
GetRawCallOverloads(call, out baseExpression, out baseValue, out tix);
var methodOverloads = new List<AbstractType>();
#region Search possible methods, opCalls or delegates that could be called
bool requireStaticItems = true; //TODO: What if there's an opCall and a foreign method at the same time? - and then this variable would be bullshit
IEnumerable<AbstractType> scanResults = DResolver.StripAliasSymbols(baseExpression);
var nextResults = new List<AbstractType>();
while (scanResults != null)
{
foreach (var b in scanResults)
{
if (b is MemberSymbol)
{
var mr = (MemberSymbol)b;
if (mr.Definition is DMethod)
{
methodOverloads.Add(mr);
continue;
}
else if (mr.Definition is DVariable)
{
// If we've got a variable here, get its base type/value reference
if (eval)
{
var dgVal = ValueProvider[(DVariable)mr.Definition] as DelegateValue;
if (dgVal != null)
{
nextResults.Add(dgVal.Definition);
continue;
}
else{
EvalError(call, "Variable must be a delegate, not anything else", mr);
return null;
}
}
else
{
var bt = DResolver.StripAliasSymbol(mr.Base ?? TypeDeclarationResolver.ResolveSingle(mr.Definition.Type, ctxt));
// Must be of type delegate
if (bt is DelegateType)
{
//TODO: Ensure that there's no further overload - inform the user elsewise
if (returnBaseTypeOnly)
return bt;
else
return new MemberSymbol(mr.Definition, bt, mr.DeclarationOrExpressionBase);
}
else
{
/*
* If mr.Node is not a method, so e.g. if it's a variable
* pointing to a delegate
*
* class Foo
* {
* string opCall() { return "asdf"; }
* }
*
* Foo f=new Foo();
* f(); -- calls opCall, opCall is not static
*/
nextResults.Add(bt);
requireStaticItems = false;
}
//TODO: Can other types work as function/are callable?
}
}
}
else if (b is DelegateType)
{
var dg = (DelegateType)b;
/*
* int a = delegate(x) { return x*2; } (12); // a is 24 after execution
* auto dg=delegate(x) {return x*3;};
* int b = dg(4);
*/
if (dg.IsFunctionLiteral)
methodOverloads.Add(dg);
else
{
// If it's just wanted to pass back the delegate's return type, skip the remaining parts of this method.
if (eval) {
EvalError(call, "TODO", dg);
return null;
}
//TODO
//if(returnBaseTypeOnly)
//TODO: Check for multiple definitions. Also, make a parameter-argument check to inform the user about wrong arguments.
return dg;
}
}
else if (b is ClassType || b is StructType)
{
var tit = (TemplateIntermediateType)b;
/*
* auto a = MyStruct(); -- opCall-Overloads can be used
*/
var classDef = tit.Definition;
if (classDef == null)
continue;
foreach (var i in GetOpCalls(tit, requireStaticItems))
methodOverloads.Add(TypeDeclarationResolver.HandleNodeMatch(i, ctxt, b, call) as MemberSymbol);
/*
* Every struct can contain a default ctor:
*
* struct S { int a; bool b; }
*
* auto s = S(1,true); -- ok
* auto s2= new S(2,false); -- error, no constructor found!
*/
if (b is StructType && methodOverloads.Count == 0)
{
//TODO: Deduce parameters
return b;
}
}
/*
* If the overload is a template, it quite exclusively means that we'll handle a method that is the only
* child inside a template + that is named as the template.
*/
else if (b is TemplateType)
methodOverloads.Add(b);
}
scanResults = nextResults.Count == 0 ? null : nextResults.ToArray();
nextResults.Clear();
}
#endregion
if (methodOverloads.Count == 0)
return null;
// Get all arguments' types
var callArguments = new List<ISemantic>();
bool hasNonFinalArgs = false;
if (call.Arguments != null)
foreach (var arg in call.Arguments)
callArguments.Add(E(arg));
#region If explicit template type args were given, try to associate them with each overload
if (tix != null)
{
var args = TemplateInstanceHandler.PreResolveTemplateArgs(tix, ctxt, out hasNonFinalArgs);
var deducedOverloads = TemplateInstanceHandler.DeduceParamsAndFilterOverloads(methodOverloads, args, true, ctxt, hasNonFinalArgs);
methodOverloads.Clear();
if(deducedOverloads != null)
methodOverloads.AddRange(deducedOverloads);
}
#endregion
#region Filter by parameter-argument comparison
var argTypeFilteredOverloads = new List<AbstractType>();
bool hasHandledUfcsResultBefore = false;
foreach (var ov in methodOverloads)
{
if (ov is MemberSymbol)
{
var ms = ov as MemberSymbol;
var dm = ms.Definition as DMethod;
if (dm != null)
{
// In the case of an ufcs, insert the first argument into the CallArguments list
if (ms.IsUFCSResult && !hasHandledUfcsResultBefore)
{
callArguments.Insert(0, eval ? baseValue as ISemantic : ((MemberSymbol)baseExpression[0]).FirstArgument);
hasHandledUfcsResultBefore = true;
}
else if (!ms.IsUFCSResult && hasHandledUfcsResultBefore) // In the rare case of having a ufcs result occuring _after_ a normal member result, remove the initial arg again
{
callArguments.RemoveAt(0);
hasHandledUfcsResultBefore = false;
}
var deducedTypeDict = new DeducedTypeDictionary(ms);
if(dm.TemplateParameters != null)
foreach(var tpar in dm.TemplateParameters)
if(!deducedTypeDict.ContainsKey(tpar.NameHash))
deducedTypeDict[tpar.NameHash] = null;
var templateParamDeduction = new TemplateParameterDeduction(deducedTypeDict, ctxt);
int currentArg = 0;
bool add = true;
if (callArguments.Count > 0 || dm.Parameters.Count > 0)
for (int i=0; i< dm.Parameters.Count; i++)
{
var paramType = dm.Parameters[i].Type;
// Handle the usage of tuples: Tuples may only be used as as-is, so not as an array, pointer or in a modified way..
if (paramType is IdentifierDeclaration &&
TryHandleMethodArgumentTuple(ref add, callArguments, dm, deducedTypeDict, i, ref currentArg))
continue;
else if (currentArg < callArguments.Count)
{
if (!templateParamDeduction.HandleDecl(null, paramType, callArguments[currentArg++]))
{
add = false;
break;
}
}
else
{
// If there are more parameters than arguments given, check if the param has default values
if (!(dm.Parameters[i] is DVariable) || (dm.Parameters[i] as DVariable).Initializer == null)
{
add = false;
break;
}
// Assume that all further method parameters do have default values - and don't check further parameters
break;
}
}
// If type params were unassigned, try to take the defaults
if (add && dm.TemplateParameters != null)
{
foreach (var tpar in dm.TemplateParameters)
{
if (deducedTypeDict[tpar.NameHash] == null)
{
add = templateParamDeduction.Handle(tpar, null);
if (!add)
{
if (hasNonFinalArgs)
{
deducedTypeDict[tpar.NameHash] = new TemplateParameterSymbol(tpar, null);
add = true;
}
else
break;
}
}
}
}
if (add && (deducedTypeDict.AllParamatersSatisfied || hasNonFinalArgs))
{
ms.DeducedTypes = deducedTypeDict.ToReadonly();
ctxt.CurrentContext.IntroduceTemplateParameterTypes(ms);
var bt=ms.Base ?? TypeDeclarationResolver.GetMethodReturnType(dm, ctxt);
ctxt.CurrentContext.RemoveParamTypesFromPreferredLocals(ms);
if(eval || !returnBaseTypeOnly)
argTypeFilteredOverloads.Add(ms.Base == null ? new MemberSymbol(dm, bt, ms.DeclarationOrExpressionBase, ms.DeducedTypes) : ms);
else
argTypeFilteredOverloads.Add(bt);
}
}
}
else if(ov is DelegateType)
{
var dg = (DelegateType)ov;
var bt = TypeDeclarationResolver.GetMethodReturnType(dg, ctxt);
//TODO: Param-Arg check
if (!eval || returnBaseTypeOnly)
argTypeFilteredOverloads.Add(bt);
else
argTypeFilteredOverloads.Add(new DelegateType(bt, dg.DeclarationOrExpressionBase as FunctionLiteral, dg.Parameters));
}
}
#endregion
if (eval)
{
// Convert ISemantic[] to ISymbolValue[]
var args = new List<ISymbolValue>(callArguments.Count);
foreach (var a in callArguments)
args.Add(a as ISymbolValue);
// Execute/Evaluate the variable contents etc.
return TryDoCTFEOrGetValueRefs(argTypeFilteredOverloads.ToArray(), call.PostfixForeExpression, true, args.ToArray());
}
else
{
// Check if one overload remains and return that one.
ctxt.CheckForSingleResult(argTypeFilteredOverloads.ToArray(), call);
return argTypeFilteredOverloads.Count != 0 ? argTypeFilteredOverloads[0] : null;
}
}