source: branches/RemoveBackwardsCompatibility/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/Ast/Statements/BlockStatement.cs

// 
// BlockStatement.cs
//
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2009 Novell, Inc (http://www.novell.com)
// 
// 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.Collections.Generic;

namespace ICSharpCode.NRefactory.CSharp
{
  /// <summary>
  /// { Statements }
  /// </summary>
  public class BlockStatement : Statement, IEnumerable<Statement>
  {
    public static readonly Role<Statement> StatementRole = new Role<Statement>("Statement", Statement.Null);
    
    #region Null
    public static readonly new BlockStatement Null = new NullBlockStatement ();
    sealed class NullBlockStatement : BlockStatement
    {
      public override bool IsNull {
        get {
          return true;
        }
      }
      
      public override void AcceptVisitor (IAstVisitor visitor)
      {
        visitor.VisitNullNode(this);
      }
      
      public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
      {
        return visitor.VisitNullNode(this);
      }
      
      public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
      {
        return visitor.VisitNullNode(this, data);
      }
      
      protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
      {
        return other == null || other.IsNull;
      }
    }
    #endregion
    
    #region PatternPlaceholder
    public static implicit operator BlockStatement(PatternMatching.Pattern pattern)
    {
      return pattern != null ? new PatternPlaceholder(pattern) : null;
    }
    
    sealed class PatternPlaceholder : BlockStatement, 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 CSharpTokenNode LBraceToken {
      get { return GetChildByRole (Roles.LBrace); }
    }
    
    public AstNodeCollection<Statement> Statements {
      get { return GetChildrenByRole (StatementRole); }
    }
    
    public CSharpTokenNode RBraceToken {
      get { return GetChildByRole (Roles.RBrace); }
    }
    
    public override void AcceptVisitor (IAstVisitor visitor)
    {
      visitor.VisitBlockStatement (this);
    }
      
    public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
    {
      return visitor.VisitBlockStatement (this);
    }
    
    public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
    {
      return visitor.VisitBlockStatement (this, data);
    }
    
    protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
    {
      BlockStatement o = other as BlockStatement;
      return o != null && !o.IsNull && this.Statements.DoMatch(o.Statements, match);
    }
    
    public void Add(Statement statement)
    {
      AddChild(statement, StatementRole);
    }
    
    IEnumerator<Statement> IEnumerable<Statement>.GetEnumerator()
    {
      return this.Statements.GetEnumerator();
    }
    
    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
    {
      return this.Statements.GetEnumerator();
    }
  }
}