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);
}
}
public static AbstractType EvalMethodCall(AbstractType[] baseExpression, ISymbolValue baseValue, TemplateInstanceExpression tix,
ResolutionContext ctxt,
PostfixExpression_MethodCall call, out List <ISemantic> callArguments, out ISymbolValue delegateValue,
bool returnBaseTypeOnly, AbstractSymbolValueProvider ValueProvider = null)
{
//TODO: Refactor this crap!
delegateValue = null;
callArguments = null;
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 = baseExpression;
var nextResults = new List <AbstractType>();
while (scanResults != null)
{
foreach (var b in scanResults)
{
if (b is AmbiguousType)
{
nextResults.AddRange((b as AmbiguousType).Overloads);
}
else if (b is TemplateParameterSymbol)
{
nextResults.Add((b as TemplateParameterSymbol).Base);
}
else 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 (ValueProvider != null)
{
var dgVal = ValueProvider[(DVariable)mr.Definition] as DelegateValue;
if (dgVal != null)
{
nextResults.Add(dgVal.Definition);
continue;
}
else
{
ValueProvider.LogError(call, "Variable must be a delegate, not anything else");
return(null);
}
}
else
{
var bt = mr.Base ?? TypeDeclarationResolver.ResolveSingle(mr.Definition.Type, ctxt);
// Must be of type delegate
if (bt is DelegateType)
{
var ret = HandleCallDelegateType(ValueProvider, bt as DelegateType, methodOverloads, returnBaseTypeOnly);
if (ret is ISymbolValue)
{
delegateValue = ret as ISymbolValue;
return(null);
}
else if (ret is AbstractType)
{
return(ret as AbstractType);
}
}
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 ret = HandleCallDelegateType(ValueProvider, b as DelegateType, methodOverloads, returnBaseTypeOnly);
if (ret is ISymbolValue)
{
delegateValue = ret as ISymbolValue;
return(null);
}
else if (ret is AbstractType)
{
return(ret as AbstractType);
}
}
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 ExpressionTypeEvaluation.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);
}
else if (b is PrimitiveType) // dmd 2.066: Uniform Construction Syntax. creal(3) is of type creal.
{
methodOverloads.Add(b);
}
}
scanResults = nextResults.Count == 0 ? null : nextResults.ToArray();
nextResults.Clear();
}
#endregion
if (methodOverloads.Count == 0)
{
return(null);
}
// Get all arguments' types
callArguments = new List <ISemantic>();
if (call.Arguments != null)
{
if (ValueProvider != null)
{
foreach (var arg in call.Arguments)
{
callArguments.Add(arg != null ? Evaluation.EvaluateValue(arg, ValueProvider) : null);
}
}
else
{
foreach (var arg in call.Arguments)
{
callArguments.Add(arg != null ? ExpressionTypeEvaluation.EvaluateType(arg, ctxt) : null);
}
}
}
#region If explicit template type args were given, try to associate them with each overload
if (tix != null)
{
var args = TemplateInstanceHandler.PreResolveTemplateArgs(tix, ctxt);
var deducedOverloads = TemplateInstanceHandler.DeduceParamsAndFilterOverloads(methodOverloads, args, true, ctxt);
methodOverloads.Clear();
if (deducedOverloads != null)
{
methodOverloads.AddRange(deducedOverloads);
}
}
#endregion
#region Filter by parameter-argument comparison
var argTypeFilteredOverloads = new List <AbstractType>();
bool hasHandledUfcsResultBefore = false;
AbstractType untemplatedMethodResult = null;
foreach (var ov in methodOverloads)
{
if (ov is MemberSymbol)
{
HandleDMethodOverload(ctxt, ValueProvider != null, baseValue, callArguments, returnBaseTypeOnly, argTypeFilteredOverloads, ref hasHandledUfcsResultBefore,
ov as MemberSymbol, ref untemplatedMethodResult);
}
else if (ov is DelegateType)
{
var dg = ov as DelegateType;
var bt = dg.Base ?? TypeDeclarationResolver.GetMethodReturnType(dg, ctxt);
//TODO: Param-Arg check
if (returnBaseTypeOnly)
{
argTypeFilteredOverloads.Add(bt);
}
else
{
if (dg.Base == null)
{
if (dg.IsFunctionLiteral)
{
dg = new DelegateType(bt, dg.DeclarationOrExpressionBase as FunctionLiteral, dg.Parameters);
}
else
{
dg = new DelegateType(bt, dg.DeclarationOrExpressionBase as DelegateDeclaration, dg.Parameters);
}
}
argTypeFilteredOverloads.Add(new DelegateCallSymbol(dg, call));
}
}
else if (ov is PrimitiveType) // dmd 2.066: Uniform Construction Syntax. creal(3) is of type creal.
{
if (ValueProvider != null)
{
if (callArguments == null || callArguments.Count != 1)
{
ValueProvider.LogError(call, "Uniform construction syntax expects exactly one argument");
}
else
{
var pv = callArguments[0] as PrimitiveValue;
if (pv == null)
{
ValueProvider.LogError(call, "Uniform construction syntax expects one built-in scalar value as first argument");
}
else
{
delegateValue = new PrimitiveValue(pv.Value, ov as PrimitiveType, pv.ImaginaryPart);
}
}
}
argTypeFilteredOverloads.Add(ov);
}
}
// Prefer untemplated methods over templated ones
if (untemplatedMethodResult != null)
{
return(untemplatedMethodResult);
}
#endregion
return(AmbiguousType.Get(argTypeFilteredOverloads, tix));
}
ISemantic E(PostfixExpression_MethodCall call, bool returnBaseTypeOnly = true)
{
// Deduce template parameters later on
AbstractType[] baseExpression = null;
ISymbolValue baseValue = null;
TemplateInstanceExpression tix = null;
bool isUFCSFunction = false;
GetRawCallOverloads(call, out baseExpression, out baseValue, out tix, out isUFCSFunction);
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
{
throw new EvaluationException(call, "Variable must be a delegate, not anything else", mr);
}
}
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)
{
throw new EvaluationException(call, "TODO", dg);
}
//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)
{
/*
* auto a = MyStruct(); -- opCall-Overloads can be used
*/
var classDef = ((ClassType)b).Definition;
if (classDef == null)
{
continue;
}
foreach (var i in classDef)
{
if (i.Name == "opCall" && i is DMethod && (!requireStaticItems || (i as DNode).IsStatic))
{
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!
*/
else 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 &&
ImplicitTemplateProperties.ContainsEquallyNamedChildrenOnly(((TemplateType)b).Definition))
{
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>();
// If it's sure that we got a ufcs call here, add the base expression's type as first argument type
if (isUFCSFunction)
{
callArguments.Add(eval ? (ISemantic)baseValue : ((MemberSymbol)baseExpression[0]).Base);
}
if (call.Arguments != null)
{
foreach (var arg in call.Arguments)
{
callArguments.Add(E(arg));
}
}
#region Deduce template parameters and filter out unmatching overloads
// First add optionally given template params
// http://dlang.org/template.html#function-templates
var tplParamDeductionArguments = tix == null ?
new List <ISemantic>() :
TemplateInstanceHandler.PreResolveTemplateArgs(tix, ctxt);
// Then add the arguments[' member types]
foreach (var arg in callArguments)
{
if (arg is VariableValue)
{
tplParamDeductionArguments.Add(ValueProvider[((VariableValue)arg).Variable]);
}
else if (arg is AbstractType)
{
tplParamDeductionArguments.Add(DResolver.StripMemberSymbols((AbstractType)arg));
}
else
{
tplParamDeductionArguments.Add(arg);
}
}
var templateParamFilteredOverloads = TemplateInstanceHandler.DeduceParamsAndFilterOverloads(
methodOverloads,
tplParamDeductionArguments.Count > 0 ? tplParamDeductionArguments.ToArray() : null,
true, ctxt);
#endregion
#region Filter by parameter-argument comparison
var argTypeFilteredOverloads = new List <AbstractType>();
if (templateParamFilteredOverloads != null)
{
foreach (var ov in templateParamFilteredOverloads)
{
if (ov is MemberSymbol)
{
var ms = (MemberSymbol)ov;
var dm = ms.Definition as DMethod;
bool add = false;
if (dm != null)
{
ctxt.CurrentContext.IntroduceTemplateParameterTypes(ms);
add = false;
if (callArguments.Count == 0 && dm.Parameters.Count == 0)
{
add = true;
}
else
{
for (int i = 0; i < dm.Parameters.Count; i++)
{
var paramType = TypeDeclarationResolver.ResolveSingle(dm.Parameters[i].Type, ctxt);
// TODO: Expression tuples & variable argument lengths
if (i >= callArguments.Count ||
!ResultComparer.IsImplicitlyConvertible(callArguments[i], paramType, ctxt))
{
continue;
}
add = true;
}
}
if (add)
{
var bt = ms.Base ?? TypeDeclarationResolver.GetMethodReturnType(dm, ctxt);
if (returnBaseTypeOnly)
{
argTypeFilteredOverloads.Add(bt);
}
else
{
argTypeFilteredOverloads.Add(ms.Base == null ? new MemberSymbol(dm, bt, ms.DeclarationOrExpressionBase, ms.DeducedTypes) : ms);
}
}
ctxt.CurrentContext.RemoveParamTypesFromPreferredLocals(ms);
}
}
else if (ov is DelegateType)
{
var dg = (DelegateType)ov;
var bt = TypeDeclarationResolver.GetMethodReturnType(dg, ctxt);
//TODO: Param-Arg check
if (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 != null && argTypeFilteredOverloads.Count != 0 ?
argTypeFilteredOverloads[0] : null);
}
}
