1 // 2 // TreeVisitorAction.h 3 // ANTLR 4 // 5 // Created by Alan Condit on 6/18/10. 6 // [The "BSD licence"] 7 // Copyright (c) 2010 Alan Condit 8 // All rights reserved. 9 // 10 // Redistribution and use in source and binary forms, with or without 11 // modification, are permitted provided that the following conditions 12 // are met: 13 // 1. Redistributions of source code must retain the above copyright 14 // notice, this list of conditions and the following disclaimer. 15 // 2. Redistributions in binary form must reproduce the above copyright 16 // notice, this list of conditions and the following disclaimer in the 17 // documentation and/or other materials provided with the distribution. 18 // 3. The name of the author may not be used to endorse or promote products 19 // derived from this software without specific prior written permission. 20 // 21 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 32 #import <Foundation/Foundation.h> 33 #import "BaseTree.h" 34 35 @interface TreeVisitorAction : NSObject 36 { 37 SEL preAction; 38 SEL postAction; 39 40 } 41 42 @property (assign, setter=setPreAction:) SEL preAction; 43 @property (assign, setter=setPostAction:) SEL postAction; 44 45 + (TreeVisitorAction *)newTreeVisitorAction; 46 - (id) init; 47 48 - (void)setPreAction:(SEL)anAction; 49 - (void)setPostAction:(SEL)anAction; 50 51 /** Execute an action before visiting children of t. Return t or 52 * a rewritten t. It is up to the visitor to decide what to do 53 * with the return value. Children of returned value will be 54 * visited if using TreeVisitor.visit(). 55 */ 56 - (id<BaseTree>)pre:(id<BaseTree>) t; 57 58 /** Execute an action after visiting children of t. Return t or 59 * a rewritten t. It is up to the visitor to decide what to do 60 * with the return value. 61 */ 62 - (id<BaseTree>)post:(id<BaseTree>) t; 63 64 @end 65 66 @class TreeFilter; 67 @class fptr; 68 69 @interface TreeVisitorActionFiltered : TreeVisitorAction 70 { 71 TreeFilter *aTFilter; 72 fptr *TDRule; 73 fptr *BURule; 74 } 75 76 @property (assign, setter=setATFilter:) TreeFilter *aTFilter; 77 78 + (TreeVisitorAction *)newTreeVisitorActionFiltered:(TreeFilter *)aFilter RuleD:(fptr *)aTDRule RuleU:(fptr *)aBURule; 79 - (id) initWithFilter:(TreeFilter *)aFilter RuleD:(fptr *)aTDRule RuleU:(fptr *)aBURule; 80 81 /** Execute an action before visiting children of t. Return t or 82 * a rewritten t. It is up to the visitor to decide what to do 83 * with the return value. Children of returned value will be 84 * visited if using TreeVisitor.visit(). 85 */ 86 - (id<BaseTree>)pre:(id<BaseTree>) t; 87 88 /** Execute an action after visiting children of t. Return t or 89 * a rewritten t. It is up to the visitor to decide what to do 90 * with the return value. 91 */ 92 - (id<BaseTree>)post:(id<BaseTree>) t; 93 94 @end 95