// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php
using Nova.Parsing;
using Nova.Resolving;
namespace Nova.CodeDOM
{
/// <summary>
/// Represents a reference to the current object instance.
/// </summary>
public class ThisRef : SelfRef
{
#region /* CONSTRUCTORS */
/// <summary>
/// Create a <see cref="BaseRef"/>.
/// </summary>
public ThisRef(bool isFirstOnLine)
: base(isFirstOnLine)
{ }
/// <summary>
/// Create a <see cref="BaseRef"/>.
/// </summary>
public ThisRef()
: base(false)
{ }
#endregion
#region /* PROPERTIES */
/// <summary>
/// The name of the <see cref="SymbolicRef"/>.
/// </summary>
public override string Name
{
get { return ParseToken; }
}
/// <summary>
/// The code object to which the <see cref="SymbolicRef"/> refers.
/// </summary>
public override object Reference
{
get
{
// Evaluate to the current type declaration, so that most properties and methods
// will function according to it.
return FindParent<TypeDecl>();
}
}
#endregion
#region /* PARSING */
/// <summary>
/// The token used to parse the code object.
/// </summary>
public const string ParseToken = "this";
internal static new void AddParsePoints()
{
// When 'this' is used for constructor initializers, it's not at Block scope, and is
// parsed by the ConstructorInitializer base class of ThisInitializer instead of here.
Parser.AddParsePoint(ParseToken, Parse);
}
/// <summary>
/// Parse a <see cref="ThisRef"/>.
/// </summary>
public static SymbolicRef Parse(Parser parser, CodeObject parent, ParseFlags flags)
{
// Handle the special case of 'this' being used on the right side of a Dot for an explicit interface declaration
// of an indexer, or to specify an Indexer member of a type, such as 'IDictionary.this[object]' (which can occur
// in a doc comment).
if (parent is Dot && ((Dot)parent).Left != null)
{
parser.NextToken(); // Move past 'this'
return new UnresolvedThisRef(parser.LastToken);
}
// By default, assume 'this' is a ThisRef
return new ThisRef(parser, parent);
}
protected ThisRef(Parser parser, CodeObject parent)
: base(parser, parent)
{
parser.NextToken(); // Move past 'this'
}
#endregion
#region /* RESOLVING */
/// <summary>
/// Evaluate the type of the <see cref="Expression"/>.
/// </summary>
/// <returns>The resulting <see cref="TypeRef"/> or <see cref="UnresolvedRef"/>.</returns>
public override TypeRefBase EvaluateType(bool withoutConstants)
{
object typeDecl = Reference;
return (typeDecl != null ? (TypeRefBase)((TypeDecl)typeDecl).CreateRef() : new UnresolvedRef(ParseToken, ResolveCategory.Type, LineNumber, ColumnNumber));
}
#endregion
#region /* RENDERING */
/// <summary>
/// The keyword associated with the <see cref="SelfRef"/>.
/// </summary>
public override string Keyword
{
get { return ParseToken; }
}
#endregion
}
}