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Diffstat (limited to 'runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTreeNodeStream.cs')
| -rw-r--r-- | runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTreeNodeStream.cs | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTreeNodeStream.cs b/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTreeNodeStream.cs deleted file mode 100644 index f9cb0a7..0000000 --- a/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/CommonTreeNodeStream.cs +++ /dev/null @@ -1,312 +0,0 @@ -/* - * [The "BSD license"] - * 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 System.Collections.Generic; - using Antlr.Runtime.Misc; - - using StringBuilder = System.Text.StringBuilder; - - [System.Serializable] - public class CommonTreeNodeStream : LookaheadStream<object>, ITreeNodeStream, IPositionTrackingStream - { - public const int DEFAULT_INITIAL_BUFFER_SIZE = 100; - public const int INITIAL_CALL_STACK_SIZE = 10; - - /** <summary>Pull nodes from which tree?</summary> */ - private readonly object _root; - - /** <summary>If this tree (root) was created from a token stream, track it.</summary> */ - protected ITokenStream tokens; - - /** <summary>What tree adaptor was used to build these trees</summary> */ - [System.NonSerialized] - private ITreeAdaptor _adaptor; - - /** The tree iterator we are using */ - private readonly TreeIterator _it; - - /** <summary>Stack of indexes used for push/pop calls</summary> */ - private Stack<int> _calls; - - /** <summary>Tree (nil A B C) trees like flat A B C streams</summary> */ - private bool _hasNilRoot = false; - - /** <summary>Tracks tree depth. Level=0 means we're at root node level.</summary> */ - private int _level = 0; - - /** - * Tracks the last node before the start of {@link #data} which contains - * position information to provide information for error reporting. This is - * tracked in addition to {@link #prevElement} which may or may not contain - * position information. - * - * @see #hasPositionInformation - * @see RecognitionException#extractInformationFromTreeNodeStream - */ - private object _previousLocationElement; - - public CommonTreeNodeStream( object tree ) - : this( new CommonTreeAdaptor(), tree ) - { - } - - public CommonTreeNodeStream( ITreeAdaptor adaptor, object tree ) - { - this._root = tree; - this._adaptor = adaptor; - _it = new TreeIterator( adaptor, _root ); - } - - #region Properties - - public virtual string SourceName - { - get - { - if ( TokenStream == null ) - return null; - - return TokenStream.SourceName; - } - } - - public virtual ITokenStream TokenStream - { - get - { - return tokens; - } - - set - { - tokens = value; - } - } - - public virtual ITreeAdaptor TreeAdaptor - { - get - { - return _adaptor; - } - - set - { - _adaptor = value; - } - } - - public virtual object TreeSource - { - get - { - return _root; - } - } - - public virtual bool UniqueNavigationNodes - { - get - { - return false; - } - - set - { - } - } - - #endregion - - public override void Reset() - { - base.Reset(); - _it.Reset(); - _hasNilRoot = false; - _level = 0; - _previousLocationElement = null; - if ( _calls != null ) - _calls.Clear(); - } - - public override object NextElement() - { - _it.MoveNext(); - object t = _it.Current; - //System.out.println("pulled "+adaptor.getType(t)); - if ( t == _it.up ) - { - _level--; - if ( _level == 0 && _hasNilRoot ) - { - _it.MoveNext(); - return _it.Current; // don't give last UP; get EOF - } - } - else if ( t == _it.down ) - { - _level++; - } - - if ( _level == 0 && TreeAdaptor.IsNil( t ) ) - { - // if nil root, scarf nil, DOWN - _hasNilRoot = true; - _it.MoveNext(); - t = _it.Current; // t is now DOWN, so get first real node next - _level++; - _it.MoveNext(); - t = _it.Current; - } - - return t; - } - - public override object Dequeue() - { - object result = base.Dequeue(); - if (_p == 0 && HasPositionInformation(PreviousElement)) - _previousLocationElement = PreviousElement; - - return result; - } - - public override bool IsEndOfFile(object o) - { - return TreeAdaptor.GetType(o) == CharStreamConstants.EndOfFile; - } - - public virtual int LA( int i ) - { - return TreeAdaptor.GetType( LT( i ) ); - } - - /** Make stream jump to a new location, saving old location. - * Switch back with pop(). - */ - public virtual void Push( int index ) - { - if ( _calls == null ) - _calls = new Stack<int>(); - - _calls.Push( _p ); // save current index - Seek( index ); - } - - /** Seek back to previous index saved during last push() call. - * Return top of stack (return index). - */ - public virtual int Pop() - { - int ret = _calls.Pop(); - Seek( ret ); - return ret; - } - - /** - * Returns an element containing position information. If {@code allowApproximateLocation} is {@code false}, then - * this method will return the {@code LT(1)} element if it contains position information, and otherwise return {@code null}. - * If {@code allowApproximateLocation} is {@code true}, then this method will return the last known element containing position information. - * - * @see #hasPositionInformation - */ - public object GetKnownPositionElement(bool allowApproximateLocation) - { - object node = _data[_p]; - if (HasPositionInformation(node)) - return node; - - if (!allowApproximateLocation) - return null; - - for (int index = _p - 1; index >= 0; index--) - { - node = _data[index]; - if (HasPositionInformation(node)) - return node; - } - - return _previousLocationElement; - } - - public bool HasPositionInformation(object node) - { - IToken token = TreeAdaptor.GetToken(node); - if (token == null) - return false; - - if (token.Line <= 0) - return false; - - return true; - } - - #region Tree rewrite interface - - public virtual void ReplaceChildren( object parent, int startChildIndex, int stopChildIndex, object t ) - { - if ( parent != null ) - { - TreeAdaptor.ReplaceChildren( parent, startChildIndex, stopChildIndex, t ); - } - } - - #endregion - - public virtual string ToString( object start, object stop ) - { - // we'll have to walk from start to stop in tree; we're not keeping - // a complete node stream buffer - return "n/a"; - } - - /** <summary>For debugging; destructive: moves tree iterator to end.</summary> */ - public virtual string ToTokenTypeString() - { - Reset(); - StringBuilder buf = new StringBuilder(); - object o = LT( 1 ); - int type = TreeAdaptor.GetType( o ); - while ( type != TokenTypes.EndOfFile ) - { - buf.Append( " " ); - buf.Append( type ); - Consume(); - o = LT( 1 ); - type = TreeAdaptor.GetType( o ); - } - return buf.ToString(); - } - } -} |