public override Expression ResolveTypes(ParserContext context, VariableScope varScope)
{
this.Root = this.Root.ResolveTypes(context, varScope);
this.Index = this.Index.ResolveTypes(context, varScope);
ResolvedType rootType = this.Root.ResolvedType;
ResolvedType indexType = this.Index.ResolvedType;
if (rootType.IsArray)
{
if (indexType.PrimitiveType != "int")
{
throw new ParserException(this.Index.FirstToken, "Array index must be an integer.");
}
this.ResolvedType = rootType.Generics[0];
}
else if (rootType.IsIDictionary(context))
{
if (!indexType.CanBeAssignedTo(rootType.Generics[0], context))
{
throw new ParserException(this.Index.FirstToken, "Incorrect key type.");
}
this.ResolvedType = rootType.Generics[1];
}
else
{
throw new System.NotImplementedException();
}
return(this);
}
public Expression ResolveTypesWithExteriorHint(
ParserContext context,
VariableScope varScope,
ResolvedType[] expectedArgsAndReturnTypes)
{
VariableScope lambdaScope = new VariableScope(varScope);
if (this.Args.Length != expectedArgsAndReturnTypes.Length - 1)
{
throw new ParserException(this.ArrowToken, "The expected number of args was " + (expectedArgsAndReturnTypes.Length - 1));
}
for (int i = 0; i < this.Args.Length; ++i)
{
lambdaScope.DeclareVariable(this.Args[i].Value, expectedArgsAndReturnTypes[i]);
}
this.Code = Executable.ResolveTypesForCode(this.Code, context, lambdaScope);
ResolvedType returnType = null;
if (this.Code.Length == 1 && this.Code[0] is ExpressionAsExecutable)
{
returnType = ((ExpressionAsExecutable)this.Code[0]).Expression.ResolvedType;
}
else if (this.Code.Length > 0 && this.Code[this.Code.Length - 1] is ReturnStatement)
{
ReturnStatement ret = (ReturnStatement)this.Code[this.Code.Length - 1];
if (ret.Value == null)
{
throw new ParserException(ret.FirstToken, "Return statement in lambda must have a value.");
}
returnType = ret.Value.ResolvedType;
}
else
{
throw new ParserException(this.FirstToken, "Not implemented: the return is hiding in this lambda.");
}
ResolvedType expectedReturnType = expectedArgsAndReturnTypes[expectedArgsAndReturnTypes.Length - 1];
if (expectedReturnType == null)
{
expectedReturnType = returnType;
}
else
{
if (!returnType.CanBeAssignedTo(expectedReturnType, context))
{
throw new ParserException(this.FirstToken, "This lambda does not seem to be returning the expected type.");
}
}
List <ResolvedType> argTypes = new List <ResolvedType>(expectedArgsAndReturnTypes);
argTypes.RemoveAt(argTypes.Count - 1);
this.ResolvedType = ResolvedType.CreateFunction(expectedReturnType, argTypes.ToArray());
return(this);
}
public void ResolveTypesForInitialData(ParserContext context, VariableScope varScope)
{
switch (this.InitialDataFormat)
{
case InitialDataFormatType.NONE: break;
case InitialDataFormatType.ITEM_LIST:
if (this.Class.Generics.Length != 1)
{
throw new ParserException(this.FirstToken, "The generics of this constructor does not support an initialization list.");
}
ResolvedType itemType = this.Class.Generics[0];
for (int i = 0; i < this.InitialDataValues.Length; ++i)
{
Expression item = this.InitialDataValues[i].ResolveTypes(context, varScope);
this.InitialDataValues[i] = item;
if (!itemType.CanBeAssignedTo(item.ResolvedType, context))
{
throw new ParserException(item.FirstToken, "Incorrect type. Cannot convert a " + item.ResolvedType + " to a " + itemType);
}
}
break;
case InitialDataFormatType.KEY_VALUES:
for (int i = 0; i < this.InitialDataValues.Length; ++i)
{
this.InitialDataKeys[i] = this.InitialDataKeys[i].ResolveTypes(context, varScope);
this.InitialDataValues[i] = this.InitialDataValues[i].ResolveTypes(context, varScope);
}
break;
case InitialDataFormatType.PROPERTIES:
for (int i = 0; i < this.InitialDataValues.Length; ++i)
{
this.InitialDataValues[i] = this.InitialDataValues[i].ResolveTypes(context, varScope);
}
break;
}
}
public override Expression ResolveTypes(ParserContext context, VariableScope varScope)
{
for (int i = 0; i < this.Expressions.Length; ++i)
{
this.Expressions[i] = this.Expressions[i].ResolveTypes(context, varScope);
}
ResolvedType cumulativeType = this.Expressions[0].ResolvedType;
for (int i = 0; i < this.Ops.Length; ++i)
{
Expression leftExpr = this.Expressions[i];
Expression rightExpr = this.Expressions[i + 1];
ResolvedType leftType = leftExpr.ResolvedType;
ResolvedType rightType = rightExpr.ResolvedType;
switch (this.Ops[i].Value)
{
case "==":
case "!=":
// anything is fine on either end.
cumulativeType = ResolvedType.Bool();
break;
case ">=":
case ">":
case "<=":
case "<":
if (!leftType.IsNumber)
{
throw new ParserException(leftExpr.FirstToken, NOT_A_NUMBER_ERROR);
}
if (!rightType.IsNumber)
{
throw new ParserException(rightExpr.FirstToken, NOT_A_NUMBER_ERROR);
}
cumulativeType = ResolvedType.Bool();
break;
case "+":
if (leftType.IsString || rightType.IsString)
{
cumulativeType = ResolvedType.String();
}
else
{
cumulativeType = CombineNumberTypes(leftExpr, rightExpr);
}
break;
case "-":
case "/":
case "*":
cumulativeType = CombineNumberTypes(leftExpr, rightExpr);
break;
case "<<":
case ">>":
case "&":
case "|":
case "^":
if (!leftType.IsIntLike)
{
throw new ParserException(leftExpr.FirstToken, INT_REQUIRED_ERROR);
}
if (!rightType.IsIntLike)
{
throw new ParserException(rightExpr.FirstToken, INT_REQUIRED_ERROR);
}
cumulativeType = CombineNumberTypes(leftExpr, rightExpr);
break;
case "&&":
case "||":
if (!leftType.IsBool)
{
throw new ParserException(leftExpr.FirstToken, BOOLEAN_REQUIRED_ERROR);
}
if (!rightType.IsBool)
{
throw new ParserException(rightExpr.FirstToken, BOOLEAN_REQUIRED_ERROR);
}
cumulativeType = ResolvedType.Bool();
break;
case "??":
if (!leftType.IsReferenceType)
{
throw new ParserException(leftExpr.FirstToken, "This type is not nullable and cannot be used with '??'");
}
if (!rightType.IsReferenceType)
{
throw new ParserException(rightExpr.FirstToken, "This type is not nullable and cannot be used with '??'");
}
if (leftType.CanBeAssignedTo(rightType, context))
{
cumulativeType = rightType;
}
else if (rightType.CanBeAssignedTo(leftType, context))
{
cumulativeType = leftType;
}
else
{
throw new ParserException(leftExpr.FirstToken, "Cannot use ?? on these two types. It is unclear what the resulting type should be.");
}
break;
default:
throw new ParserException(this.Ops[i], "The type resolution for this op is not yet implemented.");
}
}
this.ResolvedType = cumulativeType;
return(this);
}