public FieldReference(Token token, FieldDeclaration field, TopLevelConstruct owner)
: base(token, owner)
{
this.Field = field;
}
internal override void Resolve(ParserContext parser)
{
if (parser.IsInClass)
{
throw new ParserException(this.FirstToken, "Nested classes aren't a thing, yet.");
}
if (parser.IsReservedKeyword(this.NameToken.Value))
{
throw new ParserException(this.NameToken, "'" + this.NameToken.Value + "' is a reserved keyword.");
}
parser.CurrentClass = this;
for (int i = 0; i < this.Fields.Length; ++i)
{
FieldDeclaration field = this.Fields[i];
field.Resolve(parser);
this.Fields[i] = field;
if (this.StaticToken != null && !field.IsStaticField)
{
throw new ParserException(field.FirstToken, "Cannot have a non-static field in a static class.");
}
}
for (int i = 0; i < this.Methods.Length; ++i)
{
FunctionDefinition funcDef = this.Methods[i];
funcDef.Resolve(parser);
this.Methods[i] = funcDef;
if (this.StaticToken != null && !funcDef.IsStaticMethod)
{
throw new ParserException(funcDef.FirstToken, "Cannot have a non-static method in a static class.");
}
}
this.Constructor.Resolve(parser);
if (this.StaticToken != null && !this.Constructor.IsDefault)
{
throw new ParserException(this.Constructor.FirstToken, "Static classes cannot have a non-static constructor.");
}
if (this.StaticConstructor != null)
{
this.StaticConstructor.Resolve(parser);
}
parser.CurrentClass = null;
bool hasABaseClass = this.BaseClass != null;
bool callsBaseConstructor = this.Constructor.BaseToken != null;
if (hasABaseClass)
{
if (this.BaseClass.FinalToken != null)
{
throw new ParserException(this.FirstToken, "This class extends from " + this.BaseClass.NameToken.Value + " which is marked as final.");
}
if (this.BaseClass.StaticToken != null)
{
throw new ParserException(this.FirstToken, "This class extends from " + this.BaseClass.NameToken.Value + " which is marked as static.");
}
}
if (hasABaseClass && callsBaseConstructor)
{
Expression[] defaultValues = this.BaseClass.Constructor.DefaultValues;
int maxValues = defaultValues.Length;
int minValues = 0;
for (int i = 0; i < maxValues; ++i)
{
if (defaultValues[i] == null)
{
minValues++;
}
else
{
break;
}
}
int baseArgs = this.Constructor.BaseArgs.Length;
if (baseArgs < minValues || baseArgs > maxValues)
{
throw new ParserException(this.Constructor.BaseToken, "Invalid number of arguments passed to base constructor.");
}
}
else if (hasABaseClass && !callsBaseConstructor)
{
if (this.BaseClass.Constructor != null)
{
throw new ParserException(this.FirstToken, "The base class of this class has a constructor which must be called.");
}
}
else if (!hasABaseClass && callsBaseConstructor)
{
throw new ParserException(this.Constructor.BaseToken, "Cannot call base constructor without a base class.");
}
else // (!hasABaseClass && !callsBaseConstructor)
{
// yeah, that's fine.
}
}
internal override Expression ResolveNames(
ParserContext parser)
{
FunctionDefinition funcDef; // used in multiple places.
FieldDeclaration fieldDec;
this.Root = this.Root.ResolveNames(parser);
Expression root = this.Root;
string field = this.StepToken.Value;
if (root is NamespaceReference)
{
// already a fully qualified namespace, therefore imports don't matter.
string fullyQualifiedName = ((NamespaceReference)root).Template.Name + "." + field;
TopLevelConstruct 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.FirstToken, "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.IsStaticMethod)
{
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.");
}
return(new FunctionReference(this.FirstToken, funcDef, this.Owner));
}
fieldDec = cd.GetField(field, false);
if (fieldDec != null)
{
if (!fieldDec.IsStaticField)
{
throw new ParserException(this.DotToken, "Cannot make a static reference to a non-static field.");
}
return(new FieldReference(this.FirstToken, fieldDec, this.Owner));
}
if (field == "class")
{
return(new ClassReferenceLiteral(this.FirstToken, cd, this.Owner));
}
// TODO: nested classes, enums, constants
// TODO: show spelling suggestions.
throw new ParserException(this.StepToken, "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.FirstToken, "'base' keyword can only be used inside classes.");
}
ClassDefinition cd = thisClass.BaseClass;
if (cd == null)
{
throw new ParserException(root.FirstToken, "'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.IsStaticMethod)
{
throw new ParserException(this.DotToken, "Cannot reference static methods using 'base' keyword.");
}
return(new BaseMethodReference(this.FirstToken, this.DotToken, this.StepToken, this.Owner));
}
if (root is ThisKeyword)
{
ClassDefinition cd = null;
if (this.Owner != null)
{
if (this.Owner is FunctionDefinition)
{
funcDef = this.Owner as FunctionDefinition;
if (funcDef.IsStaticMethod)
{
throw new ParserException(this.Root.FirstToken, "'this' keyword cannot be used in static methods.");
}
cd = funcDef.Owner as ClassDefinition;
if (cd == null)
{
throw new ParserException(this.Root.FirstToken, "'this' keyword must be used inside a class.");
}
}
else if (this.Owner is ClassDefinition)
{
cd = (ClassDefinition)this.Owner;
}
}
if (cd == null)
{
throw new ParserException(this.Root.FirstToken, "'this' keyword is not allowed here.");
}
funcDef = cd.GetMethod(field, true);
if (funcDef != null)
{
if (funcDef.IsStaticMethod)
{
throw new ParserException(this.DotToken, "This method is static and must be referenced by the class name, not 'this'.");
}
return(new FunctionReference(this.FirstToken, funcDef, this.Owner));
}
FieldDeclaration fieldDef = cd.GetField(field, true);
if (fieldDef != null)
{
if (fieldDef.IsStaticField)
{
throw new ParserException(this.DotToken, "This field is static and must be referenced by the class name, not 'this'.");
}
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.StepToken, "The class '" + cd.NameToken.Value + "' does not have a field named '" + field + "'.");
}
// This is done here in the resolver instead of the parser because some unallowed
// field names (such as .class) are valid.
if (this.StepToken.Value == parser.Keywords.CLASS)
{
if (this.Root is Variable)
{
throw new ParserException(this.Root.FirstToken, "'" + ((Variable)this.Root).Name + "' is not a class.");
}
throw new ParserException(this.DotToken, ".class can only be applied to class names.");
}
parser.VerifyIdentifier(this.StepToken);
return(this);
}