| /* |
| [The "BSD licence"] |
| Copyright (c) 2005-2006 Terence Parr |
| 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. |
| */ |
| package org.antlr.runtime.tree { |
| |
| public class RewriteRuleSubtreeStream extends RewriteRuleElementStream { |
| |
| public function RewriteRuleSubtreeStream(adaptor:TreeAdaptor, elementDescription:String, element:Object=null) { |
| super(adaptor, elementDescription, element); |
| } |
| |
| /** Treat next element as a single node even if it's a subtree. |
| * This is used instead of next() when the result has to be a |
| * tree root node. Also prevents us from duplicating recently-added |
| * children; e.g., ^(type ID)+ adds ID to type and then 2nd iteration |
| * must dup the type node, but ID has been added. |
| * |
| * Referencing a rule result twice is ok; dup entire tree as |
| * we can't be adding trees as root; e.g., expr expr. |
| * |
| * Hideous code duplication here with super.next(). Can't think of |
| * a proper way to refactor. This needs to always call dup node |
| * and super.next() doesn't know which to call: dup node or dup tree. |
| */ |
| public function nextNode():Object { |
| var n:int = size; |
| var el:Object; |
| if ( dirty || (cursor>=n && n==1) ) { |
| // if out of elements and size is 1, dup (at most a single node |
| // since this is for making root nodes). |
| el = _next(); |
| return adaptor.dupNode(el); |
| } |
| // test size above then fetch |
| el = _next(); |
| return el; |
| } |
| |
| protected override function dup(el:Object):Object { |
| return adaptor.dupTree(el); |
| } |
| } |
| } |