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// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
namespace ICSharpCode.NRefactory.CSharp
{
/// <summary>
/// Base class for statements.
/// </summary>
/// <remarks>
/// This class is useful even though it doesn't provide any additional functionality:
/// It can be used to communicate more information in APIs, e.g. "this subnode will always be a statement"
/// </remarks>
public abstract class Statement : AstNode
{
#region Null
public new static readonly Statement Null = new NullStatement ();
sealed class NullStatement : Statement
{
public override bool IsNull {
get {
return true;
}
}
public override void AcceptVisitor (IAstVisitor visitor)
{
}
public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
{
return default (T);
}
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 PatternPlaceholder
public static implicit operator Statement(PatternMatching.Pattern pattern)
{
return pattern != null ? new PatternPlaceholder(pattern) : null;
}
sealed class PatternPlaceholder : Statement, PatternMatching.INode
{
readonly PatternMatching.Pattern child;
public PatternPlaceholder(PatternMatching.Pattern child)
{
this.child = child;
}
public override NodeType NodeType {
get { return NodeType.Pattern; }
}
public override void AcceptVisitor (IAstVisitor visitor)
{
visitor.VisitPatternPlaceholder(this, child);
}
public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
{
return visitor.VisitPatternPlaceholder(this, child);
}
public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
{
return visitor.VisitPatternPlaceholder(this, child, data);
}
protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
{
return child.DoMatch(other, match);
}
bool PatternMatching.INode.DoMatchCollection(Role role, PatternMatching.INode pos, PatternMatching.Match match, PatternMatching.BacktrackingInfo backtrackingInfo)
{
return child.DoMatchCollection(role, pos, match, backtrackingInfo);
}
}
#endregion
public new Statement Clone()
{
return (Statement)base.Clone();
}
public Statement ReplaceWith(Func<Statement, Statement> replaceFunction)
{
if (replaceFunction == null)
throw new ArgumentNullException("replaceFunction");
return (Statement)base.ReplaceWith(node => replaceFunction((Statement)node));
}
public override NodeType NodeType {
get { return NodeType.Statement; }
}
}
}
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