private void EnsureModifiersAndTypeSignatureConsistencyForClassMethods(TypeContext tc)
{
ClassDefinition classDef = (ClassDefinition)this.Owner;
ClassDefinition baseClass = classDef.BaseClass;
bool hasBaseClass = baseClass != null;
if (hasBaseClass)
{
FieldDefinition hiddenField = baseClass.GetField(this.NameToken.Value, true);
if (hiddenField != null)
{
throw new ParserException(this, "This function definition hides a field from a parent class.");
}
}
if (!hasBaseClass)
{
if (this.Modifiers.HasOverride)
{
throw new ParserException(this, "Cannot mark a method as 'override' if it has no base class.");
}
}
else
{
FunctionDefinition overriddenFunction = baseClass.GetMethod(this.NameToken.Value, true);
if (overriddenFunction != null)
{
if (!this.Modifiers.HasOverride)
{
if (this.CompilationScope.IsCrayon)
{
// TODO: just warn if not present
}
else
{
throw new ParserException(this, "This function hides another function from a parent class. If overriding is intentional, use the 'override' keyword.");
}
}
if (overriddenFunction.Modifiers.HasStatic)
{
throw new ParserException(this, "Cannot override a static method.");
}
if (overriddenFunction.Modifiers.AccessModifierType != this.Modifiers.AccessModifierType)
{
throw new ParserException(this, "This method defines a different access modifier than its overridden parent.");
}
if (overriddenFunction.Modifiers.AccessModifierType == AccessModifierType.PRIVATE)
{
throw new ParserException(this, "Cannot override a private method.");
}
if (overriddenFunction.Modifiers.HasInternal &&
overriddenFunction.CompilationScope != this.CompilationScope)
{
throw new ParserException(this, "Cannot override this method. It is marked as internal and is located in a different assembly.");
}
if (overriddenFunction.ResolvedReturnType != this.ResolvedReturnType)
{
if (overriddenFunction.ResolvedReturnType == tc.ANY &&
this.ResolvedReturnType == tc.OBJECT)
{
// This is fine.
}
else
{
throw new ParserException(this, "This function returns a different type than its overridden parent.");
}
}
if (overriddenFunction.ArgTypes.Length != this.ArgTypes.Length)
{
throw new ParserException(this, "This function has a different number of arguments than its overridden parent.");
}
if (overriddenFunction.MinArgCount != this.MinArgCount)
{
throw new ParserException(this, "This function has a different number of optional arguments than its overridden parent.");
}
// TODO: if you are overridding a function between a statically and dynamically typed languagte,
// the dynamic language should pick up the types from the statically typed language or the
// statically typed language should require "object" types in its signature for the other direction.
for (int i = 0; i < this.ArgTypes.Length; ++i)
{
ResolvedType expected = overriddenFunction.ResolvedArgTypes[i];
ResolvedType actual = this.ResolvedArgTypes[i];
if (actual != expected &&
!(actual == tc.OBJECT && expected == tc.ANY))
{
throw new ParserException(this, "This function has arguments that are different types than its overridden parent.");
}
}
}
else
{
if (this.Modifiers.HasOverride)
{
throw new ParserException(this, "This function is marked as 'override', but there is no method in a parent class with the same name.");
}
}
}
}
internal override Expression ResolveEntityNames(
ParserContext parser)
{
FunctionDefinition funcDef; // used in multiple places.
FieldDefinition fieldDec;
this.Root = this.Root.ResolveEntityNames(parser);
Expression root = this.Root;
string field = this.FieldToken.Value;
if (root is NamespaceReference)
{
// already a fully qualified namespace, therefore imports don't matter.
string fullyQualifiedName = ((NamespaceReference)root).Template.Name + "." + field;
TopLevelEntity entity = this.Owner.FileScope.FileScopeEntityLookup.DoEntityLookup(fullyQualifiedName, parser.CurrentCodeContainer);
if (entity != null)
{
return(ResolverPipeline.ConvertStaticReferenceToExpression(entity, this.FirstToken, this.Owner));
}
NamespaceReferenceTemplate nrt = this.Owner.FileScope.FileScopeEntityLookup.DoNamespaceLookup(fullyQualifiedName, parser.CurrentCodeContainer);
if (nrt != null)
{
return(new NamespaceReference(this.FirstToken, this.Owner, nrt));
}
throw new ParserException(this, "Could not find class or function by the name of: '" + fullyQualifiedName + "'");
}
if (root is ClassReference)
{
ClassDefinition cd = ((ClassReference)root).ClassDefinition;
funcDef = cd.GetMethod(field, false);
if (funcDef != null)
{
if (!funcDef.Modifiers.HasStatic)
{
string className = cd.NameToken.Value;
string functionName = funcDef.NameToken.Value;
throw new ParserException(this.DotToken, "'" + className + "." + functionName + "' is not a static method, but it is being used as though it is static.");
}
Node.EnsureAccessIsAllowed(this.FieldToken, this.Owner, funcDef);
return(new FunctionReference(this.FirstToken, funcDef, this.Owner));
}
fieldDec = cd.GetField(field, false);
if (fieldDec != null)
{
if (!fieldDec.Modifiers.HasStatic)
{
throw new ParserException(this.DotToken, "Cannot make a static reference to a non-static field.");
}
Node.EnsureAccessIsAllowed(this.FieldToken, this.Owner, fieldDec);
return(new FieldReference(this.FirstToken, fieldDec, this.Owner));
}
// TODO: typeof(class name) is less error prone with localization conflicts.
// However there's a Core.typeOf() method that sort of conflicts.
// TODO: if this notation is kept, then this needs to be split into two class keywords
// since they do different things.
if (field == parser.Keywords.CLASS)
{
return(new ClassReferenceLiteral(this.FirstToken, cd, this.Owner));
}
// TODO: nested classes, enums, constants
// TODO: show spelling suggestions.
throw new ParserException(this.FieldToken, "No static fields or methods named '" + field + "' on the class " + cd.NameToken.Value + ".");
}
if (root is BaseKeyword)
{
ClassDefinition thisClass = null;
if (this.Owner != null)
{
if (this.Owner is FunctionDefinition)
{
thisClass = this.Owner.Owner as ClassDefinition;
}
else
{
thisClass = this.Owner as ClassDefinition;
}
}
if (thisClass == null)
{
throw new ParserException(root, "'base' keyword can only be used inside classes.");
}
ClassDefinition cd = thisClass.BaseClass;
if (cd == null)
{
throw new ParserException(root, "'base' keyword can only be used inside classes that extend from another class.");
}
FunctionDefinition fd = cd.GetMethod(field, true);
if (fd == null)
{
throw new ParserException(this.DotToken, "Cannot find a method by that name in the base class chain.");
}
if (fd.Modifiers.HasStatic)
{
throw new ParserException(this.DotToken, "Cannot reference static methods using 'base' keyword.");
}
Node.EnsureAccessIsAllowed(this.DotToken, this.Owner, fd);
return(new BaseMethodReference(this.FirstToken, this.DotToken, this.FieldToken, this.Owner));
}
if (root is ThisKeyword)
{
ClassDefinition cd = null;
TopLevelEntity owner = this.TopLevelEntity;
if (owner is FunctionDefinition)
{
FunctionDefinition functionOwner = (FunctionDefinition)owner;
if (functionOwner.Modifiers.HasStatic)
{
throw new ParserException(this.Root, "'this' keyword cannot be used in static methods.");
}
if (!(functionOwner.Owner is ClassDefinition))
{
throw new ParserException(this.Root, "'this' keyword cannot be used in a function that isn't in a class.");
}
cd = (ClassDefinition)owner.Owner;
}
else if (owner is FieldDefinition)
{
if (((FieldDefinition)owner).Modifiers.HasStatic)
{
throw new ParserException(this.Root, "'this' keyword cannot be used in static fields.");
}
cd = (ClassDefinition)owner.Owner;
}
else if (owner is ConstructorDefinition)
{
if (((ConstructorDefinition)owner).Modifiers.HasStatic)
{
throw new ParserException(this.Root, "'this', keyword cannot be used in static constructors.");
}
cd = (ClassDefinition)owner.Owner;
}
else
{
throw new ParserException(this.Root, "'this' keyword must be used inside a class.");
}
funcDef = cd.GetMethod(field, true);
if (funcDef != null)
{
if (funcDef.Modifiers.HasStatic)
{
throw new ParserException(this.DotToken, "This method is static and must be referenced by the class name, not 'this'.");
}
Node.EnsureAccessIsAllowed(this.DotToken, this.Owner, funcDef);
return(new FunctionReference(this.FirstToken, funcDef, this.Owner));
}
FieldDefinition fieldDef = cd.GetField(field, true);
if (fieldDef != null)
{
if (fieldDef.Modifiers.HasStatic)
{
throw new ParserException(this.DotToken, "This field is static and must be referenced by the class name, not 'this'.");
}
Node.EnsureAccessIsAllowed(this.DotToken, this.Owner, fieldDef);
return(new FieldReference(this.FirstToken, fieldDef, this.Owner));
}
// TODO: show suggestions in the error message for anything close to what was typed.
throw new ParserException(this.FieldToken, "The class '" + cd.NameToken.Value + "' does not have a field named '" + field + "'.");
}
if (this.Root is EnumReference)
{
EnumDefinition enumDef = ((EnumReference)this.Root).EnumDefinition;
if (field == parser.Keywords.FIELD_ENUM_LENGTH)
{
return(new IntegerConstant(this.FirstToken, enumDef.Items.Length, this.Owner));
}
if (field == parser.Keywords.FIELD_ENUM_MAX)
{
return(new SpecialEntity.EnumMaxFunction(this.FirstToken, enumDef, this.Owner));
}
if (field == parser.Keywords.FIELD_ENUM_VALUES)
{
return(new SpecialEntity.EnumValuesFunction(this.FirstToken, enumDef, this.Owner));
}
return(new EnumFieldReference(this.FirstToken, enumDef, this.FieldToken, this.Owner));
}
// This is done here in the resolver instead of the parser because some unallowed
// field names (such as .class) are valid.
if (field == parser.Keywords.CLASS)
{
if (this.Root is Variable)
{
throw new ParserException(this.Root, "'" + ((Variable)this.Root).Name + "' is not a class.");
}
throw new ParserException(this.DotToken, ".class can only be applied to class names.");
}
parser.VerifyIdentifier(this.FieldToken);
return(this);
}