297 lines
7.6 KiB
C#
297 lines
7.6 KiB
C#
/*
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* [The "BSD licence"]
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* Copyright (c) 2011 Terence Parr
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* All rights reserved.
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*
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* Conversion to C#:
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* Copyright (c) 2011 Sam Harwell, Pixel Mine, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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namespace Antlr.Runtime.Tree
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{
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using ArgumentNullException = System.ArgumentNullException;
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/** <summary>
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* A tree node that is wrapper for a Token object. After 3.0 release
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* while building tree rewrite stuff, it became clear that computing
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* parent and child index is very difficult and cumbersome. Better to
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* spend the space in every tree node. If you don't want these extra
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* fields, it's easy to cut them out in your own BaseTree subclass.
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* </summary>
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*/
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[System.Serializable]
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public class CommonTree : BaseTree
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{
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/** <summary>A single token is the payload</summary> */
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private IToken _token;
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/** <summary>
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* What token indexes bracket all tokens associated with this node
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* and below?
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* </summary>
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*/
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protected int startIndex = -1;
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protected int stopIndex = -1;
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/** <summary>Who is the parent node of this node; if null, implies node is root</summary> */
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CommonTree parent;
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/** <summary>What index is this node in the child list? Range: 0..n-1</summary> */
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int childIndex = -1;
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public CommonTree()
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{
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}
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public CommonTree( CommonTree node )
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: base( node )
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{
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if (node == null)
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throw new ArgumentNullException("node");
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this.Token = node.Token;
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this.startIndex = node.startIndex;
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this.stopIndex = node.stopIndex;
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}
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public CommonTree( IToken t )
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{
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this.Token = t;
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}
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#region Properties
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public override int CharPositionInLine
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{
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get
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{
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if ( Token == null || Token.CharPositionInLine == -1 )
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{
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if ( ChildCount > 0 )
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return Children[0].CharPositionInLine;
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return 0;
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}
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return Token.CharPositionInLine;
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}
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set
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{
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base.CharPositionInLine = value;
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}
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}
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public override int ChildIndex
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{
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get
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{
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return childIndex;
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}
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set
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{
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childIndex = value;
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}
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}
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public override bool IsNil
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{
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get
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{
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return Token == null;
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}
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}
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public override int Line
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{
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get
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{
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if ( Token == null || Token.Line == 0 )
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{
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if ( ChildCount > 0 )
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return Children[0].Line;
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return 0;
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}
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return Token.Line;
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}
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set
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{
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base.Line = value;
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}
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}
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public override ITree Parent
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{
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get
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{
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return parent;
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}
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set
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{
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parent = (CommonTree)value;
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}
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}
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public override string Text
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{
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get
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{
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if ( Token == null )
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return null;
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return Token.Text;
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}
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set
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{
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}
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}
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public IToken Token
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{
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get
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{
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return _token;
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}
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set
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{
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_token = value;
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}
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}
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public override int TokenStartIndex
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{
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get
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{
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if ( startIndex == -1 && Token != null )
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return Token.TokenIndex;
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return startIndex;
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}
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set
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{
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startIndex = value;
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}
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}
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public override int TokenStopIndex
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{
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get
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{
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if ( stopIndex == -1 && Token != null )
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{
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return Token.TokenIndex;
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}
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return stopIndex;
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}
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set
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{
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stopIndex = value;
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}
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}
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public override int Type
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{
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get
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{
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if ( Token == null )
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return TokenTypes.Invalid;
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return Token.Type;
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}
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set
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{
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}
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}
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#endregion
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public override ITree DupNode()
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{
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return new CommonTree( this );
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}
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/** <summary>
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* For every node in this subtree, make sure it's start/stop token's
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* are set. Walk depth first, visit bottom up. Only updates nodes
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* with at least one token index < 0.
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* </summary>
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*/
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public virtual void SetUnknownTokenBoundaries()
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{
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if ( Children == null )
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{
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if ( startIndex < 0 || stopIndex < 0 )
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startIndex = stopIndex = Token.TokenIndex;
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return;
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}
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foreach (ITree childTree in Children)
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{
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CommonTree commonTree = childTree as CommonTree;
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if (commonTree == null)
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continue;
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commonTree.SetUnknownTokenBoundaries();
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}
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if ( startIndex >= 0 && stopIndex >= 0 )
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return; // already set
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if ( Children.Count > 0 )
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{
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ITree firstChild = Children[0];
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ITree lastChild = Children[Children.Count - 1];
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startIndex = firstChild.TokenStartIndex;
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stopIndex = lastChild.TokenStopIndex;
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}
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}
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public override string ToString()
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{
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if (IsNil)
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return "nil";
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if (Type == TokenTypes.Invalid)
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return "<errornode>";
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if (Token == null)
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return string.Empty;
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return Token.Text;
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}
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}
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}
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