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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under MIT X11 license (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
namespace ICSharpCode.NRefactory.VB.Ast
{
public abstract class Expression : AstNode
{
#region Null
public new static readonly Expression Null = new NullExpression ();
sealed class NullExpression : Expression
{
public override bool IsNull {
get {
return true;
}
}
public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
{
return default (S);
}
protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
{
return other == null || other.IsNull;
}
}
#endregion
#region Builder methods
/// <summary>
/// Builds an member reference expression using this expression as target.
/// </summary>
public MemberAccessExpression Member(string memberName)
{
return new MemberAccessExpression { Target = this, MemberName = memberName };
}
/// <summary>
/// Builds an invocation expression using this expression as target.
/// </summary>
public InvocationExpression Invoke(string methodName, IEnumerable<Expression> arguments)
{
return Invoke(methodName, null, arguments);
}
/// <summary>
/// Builds an invocation expression using this expression as target.
/// </summary>
public InvocationExpression Invoke(string methodName, params Expression[] arguments)
{
return Invoke(methodName, null, arguments);
}
/// <summary>
/// Builds an invocation expression using this expression as target.
/// </summary>
public InvocationExpression Invoke(string methodName, IEnumerable<AstType> typeArguments, IEnumerable<Expression> arguments)
{
InvocationExpression ie = new InvocationExpression();
MemberAccessExpression mre = new MemberAccessExpression();
mre.Target = this;
mre.MemberName = methodName;
mre.TypeArguments.AddRange(typeArguments);
ie.Target = mre;
ie.Arguments.AddRange(arguments);
return ie;
}
/// <summary>
/// Builds an invocation expression using this expression as target.
/// </summary>
public InvocationExpression Invoke(IEnumerable<Expression> arguments)
{
InvocationExpression ie = new InvocationExpression();
ie.Target = this;
ie.Arguments.AddRange(arguments);
return ie;
}
/// <summary>
/// Builds an invocation expression using this expression as target.
/// </summary>
public InvocationExpression Invoke(params Expression[] arguments)
{
InvocationExpression ie = new InvocationExpression();
ie.Target = this;
ie.Arguments.AddRange(arguments);
return ie;
}
public CastExpression CastTo(AstType type)
{
return new CastExpression { CastType = CastType.CType, Type = type, Expression = this };
}
public CastExpression CastTo(Type type)
{
return new CastExpression { CastType = CastType.CType, Type = AstType.Create(type), Expression = this };
}
#endregion
}
}
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