Experiments/Attic/Rook/Castle.Rook.Compiler/AST/ASTNode.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.Rook.Compiler.AST
  16 {
  17         using System;
  18         using Castle.Rook.Compiler.Visitors;
  19
  20
  21         public abstract class ASTNode : IASTNode
  22         {
  23                 private IASTNode parent;
  24                 private LexicalPosition position;
  25                 private ISymbolTable symTable;
  26
  27                 public ASTNode()
  28                 {
  29                 }
  30
  31                 public ASTNode(ISymbolTable symTable)
  32                 {
  33                         this.symTable = symTable;
  34                 }
  35
  36                 public IASTNode Parent
  37                 {
  38                         get { return parent; }
  39                         set { parent = value; }
  40                 }
  41
  42                 public LexicalPosition Position
  43                 {
  44                         get { return position; }
  45                         set { position = value; }
  46                 }
  47
  48                 public ISymbolTable DefiningSymbolTable
  49                 {
  50                         get { return symTable;  }
  51                         set { symTable = value; }
  52                 }
  53
  54                 public virtual void ReplaceBy(IASTNode node)
  55                 {
  56                         if (Parent != null)
  57                         {
  58                                 throw new ApplicationException("Couldn't find a parent node to delegate");
  59                         }
  60
  61                         Parent.ReplaceChild(this, node);
  62                 }
  63
  64                 public virtual void ReplaceChild(IASTNode oldNode, IASTNode newNode)
  65                 {
  66                         throw new NotImplementedException( this.GetType().FullName + " must implement ReplaceChild" );
  67                 }
  68
  69                 public virtual void RemoveChild(IASTNode node)
  70                 {
  71                         throw new NotImplementedException( this.GetType().FullName + " must implement RemoveChild" );
  72                 }
  73
  74                 public virtual bool Accept(IASTVisitor visitor)
  75                 {
  76                         throw new NotImplementedException( this.GetType().FullName + " must implement Accept" );
  77                 }
  78         }
  79 }