diff options
Diffstat (limited to 'runtime/CSharp3/Sources/Antlr3.Runtime/Tree/TreeRewriter.cs')
-rw-r--r-- | runtime/CSharp3/Sources/Antlr3.Runtime/Tree/TreeRewriter.cs | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/TreeRewriter.cs b/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/TreeRewriter.cs deleted file mode 100644 index 16a38a2..0000000 --- a/runtime/CSharp3/Sources/Antlr3.Runtime/Tree/TreeRewriter.cs +++ /dev/null @@ -1,144 +0,0 @@ -/* - * [The "BSD licence"] - * Copyright (c) 2005-2008 Terence Parr - * All rights reserved. - * - * Conversion to C#: - * Copyright (c) 2008-2009 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 Antlr.Runtime.Misc; - - using Console = System.Console; - - public class TreeRewriter : TreeParser - { - protected bool showTransformations; - - protected ITokenStream originalTokenStream; - protected ITreeAdaptor originalAdaptor; - - Func<IAstRuleReturnScope> topdown_func; - Func<IAstRuleReturnScope> bottomup_func; - - public TreeRewriter( ITreeNodeStream input ) - : this( input, new RecognizerSharedState() ) - { - } - public TreeRewriter( ITreeNodeStream input, RecognizerSharedState state ) - : base( input, state ) - { - originalAdaptor = input.TreeAdaptor; - originalTokenStream = input.TokenStream; - topdown_func = () => Topdown(); - bottomup_func = () => Bottomup(); - } - - public virtual object ApplyOnce( object t, Func<IAstRuleReturnScope> whichRule ) - { - if ( t == null ) - return null; - - try - { - // share TreeParser object but not parsing-related state - SetState(new RecognizerSharedState()); - SetTreeNodeStream(new CommonTreeNodeStream(originalAdaptor, t)); - ( (CommonTreeNodeStream)input ).TokenStream = originalTokenStream; - BacktrackingLevel = 1; - IAstRuleReturnScope r = whichRule(); - BacktrackingLevel = 0; - if ( Failed ) - return t; - - if (showTransformations && r != null && !t.Equals(r.Tree) && r.Tree != null) - ReportTransformation(t, r.Tree); - - if ( r != null && r.Tree != null ) - return r.Tree; - else - return t; - } - catch ( RecognitionException ) - { - } - - return t; - } - - public virtual object ApplyRepeatedly( object t, Func<IAstRuleReturnScope> whichRule ) - { - bool treeChanged = true; - while ( treeChanged ) - { - object u = ApplyOnce( t, whichRule ); - treeChanged = !t.Equals( u ); - t = u; - } - return t; - } - - public virtual object Downup( object t ) - { - return Downup( t, false ); - } - - public virtual object Downup( object t, bool showTransformations ) - { - this.showTransformations = showTransformations; - TreeVisitor v = new TreeVisitor( new CommonTreeAdaptor() ); - t = v.Visit( t, ( o ) => ApplyOnce( o, topdown_func ), ( o ) => ApplyRepeatedly( o, bottomup_func ) ); - return t; - } - - // methods the downup strategy uses to do the up and down rules. - // to override, just define tree grammar rule topdown and turn on - // filter=true. - protected virtual IAstRuleReturnScope Topdown() - { - return null; - } - - protected virtual IAstRuleReturnScope Bottomup() - { - return null; - } - - /** Override this if you need transformation tracing to go somewhere - * other than stdout or if you're not using ITree-derived trees. - */ - protected virtual void ReportTransformation(object oldTree, object newTree) - { - ITree old = oldTree as ITree; - ITree @new = newTree as ITree; - string oldMessage = old != null ? old.ToStringTree() : "??"; - string newMessage = @new != null ? @new.ToStringTree() : "??"; - Console.WriteLine("{0} -> {1}", oldMessage, newMessage); - } - } -} |