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Diffstat (limited to 'runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTree.cs')
| -rw-r--r-- | runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTree.cs | 296 |
1 files changed, 296 insertions, 0 deletions
diff --git a/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTree.cs b/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTree.cs new file mode 100644 index 0000000..33f9bda --- /dev/null +++ b/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTree.cs @@ -0,0 +1,296 @@ +/* + * [The "BSD licence"] + * Copyright (c) 2011 Terence Parr + * All rights reserved. + * + * Conversion to C#: + * Copyright (c) 2011 Sam Harwell, Pixel Mine, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +namespace Antlr.Runtime.Tree +{ + using ArgumentNullException = System.ArgumentNullException; + + /** <summary> + * A tree node that is wrapper for a Token object. After 3.0 release + * while building tree rewrite stuff, it became clear that computing + * parent and child index is very difficult and cumbersome. Better to + * spend the space in every tree node. If you don't want these extra + * fields, it's easy to cut them out in your own BaseTree subclass. + * </summary> + */ + [System.Serializable] + public class CommonTree : BaseTree + { + /** <summary>A single token is the payload</summary> */ + private IToken _token; + + /** <summary> + * What token indexes bracket all tokens associated with this node + * and below? + * </summary> + */ + protected int startIndex = -1; + protected int stopIndex = -1; + + /** <summary>Who is the parent node of this node; if null, implies node is root</summary> */ + CommonTree parent; + + /** <summary>What index is this node in the child list? Range: 0..n-1</summary> */ + int childIndex = -1; + + public CommonTree() + { + } + + public CommonTree( CommonTree node ) + : base( node ) + { + if (node == null) + throw new ArgumentNullException("node"); + + this.Token = node.Token; + this.startIndex = node.startIndex; + this.stopIndex = node.stopIndex; + } + + public CommonTree( IToken t ) + { + this.Token = t; + } + + #region Properties + + public override int CharPositionInLine + { + get + { + if ( Token == null || Token.CharPositionInLine == -1 ) + { + if ( ChildCount > 0 ) + return Children[0].CharPositionInLine; + + return 0; + } + return Token.CharPositionInLine; + } + + set + { + base.CharPositionInLine = value; + } + } + + public override int ChildIndex + { + get + { + return childIndex; + } + + set + { + childIndex = value; + } + } + + public override bool IsNil + { + get + { + return Token == null; + } + } + + public override int Line + { + get + { + if ( Token == null || Token.Line == 0 ) + { + if ( ChildCount > 0 ) + return Children[0].Line; + + return 0; + } + + return Token.Line; + } + + set + { + base.Line = value; + } + } + + public override ITree Parent + { + get + { + return parent; + } + + set + { + parent = (CommonTree)value; + } + } + + public override string Text + { + get + { + if ( Token == null ) + return null; + + return Token.Text; + } + + set + { + } + } + + public IToken Token + { + get + { + return _token; + } + + set + { + _token = value; + } + } + + public override int TokenStartIndex + { + get + { + if ( startIndex == -1 && Token != null ) + return Token.TokenIndex; + + return startIndex; + } + + set + { + startIndex = value; + } + } + + public override int TokenStopIndex + { + get + { + if ( stopIndex == -1 && Token != null ) + { + return Token.TokenIndex; + } + return stopIndex; + } + + set + { + stopIndex = value; + } + } + + public override int Type + { + get + { + if ( Token == null ) + return TokenTypes.Invalid; + + return Token.Type; + } + + set + { + } + } + + #endregion + + public override ITree DupNode() + { + return new CommonTree( this ); + } + + /** <summary> + * For every node in this subtree, make sure it's start/stop token's + * are set. Walk depth first, visit bottom up. Only updates nodes + * with at least one token index < 0. + * </summary> + */ + public virtual void SetUnknownTokenBoundaries() + { + if ( Children == null ) + { + if ( startIndex < 0 || stopIndex < 0 ) + startIndex = stopIndex = Token.TokenIndex; + + return; + } + + foreach (ITree childTree in Children) + { + CommonTree commonTree = childTree as CommonTree; + if (commonTree == null) + continue; + + commonTree.SetUnknownTokenBoundaries(); + } + + if ( startIndex >= 0 && stopIndex >= 0 ) + return; // already set + + if ( Children.Count > 0 ) + { + ITree firstChild = Children[0]; + ITree lastChild = Children[Children.Count - 1]; + startIndex = firstChild.TokenStartIndex; + stopIndex = lastChild.TokenStopIndex; + } + } + + public override string ToString() + { + if (IsNil) + return "nil"; + + if (Type == TokenTypes.Invalid) + return "<errornode>"; + + if (Token == null) + return string.Empty; + + return Token.Text; + } + } +} |