1// 2// RewriteRuleSubtreeStream.m 3// ANTLR 4// 5// Created by Kay Röpke on 7/16/07. 6// [The "BSD licence"] 7// Copyright (c) 2007 Kay Röpke 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 "RewriteRuleSubtreeStream.h" 33 34 35@implementation RewriteRuleSubtreeStream 36 37+ (RewriteRuleSubtreeStream*) newRewriteRuleSubtreeStream:(id<TreeAdaptor>)aTreeAdaptor 38 description:(NSString *)anElementDescription; 39{ 40 return [[RewriteRuleSubtreeStream alloc] initWithTreeAdaptor:aTreeAdaptor 41 description:anElementDescription]; 42} 43 44+ (RewriteRuleSubtreeStream*) newRewriteRuleSubtreeStream:(id<TreeAdaptor>)aTreeAdaptor 45 description:(NSString *)anElementDescription 46 element:(id)anElement; 47{ 48 return [[RewriteRuleSubtreeStream alloc] initWithTreeAdaptor:aTreeAdaptor 49 description:anElementDescription 50 element:anElement]; 51} 52 53+ (RewriteRuleSubtreeStream*) newRewriteRuleSubtreeStream:(id<TreeAdaptor>)aTreeAdaptor 54 description:(NSString *)anElementDescription 55 elements:(NSArray *)theElements; 56{ 57 return [[RewriteRuleSubtreeStream alloc] initWithTreeAdaptor:aTreeAdaptor 58 description:anElementDescription 59 elements:theElements]; 60} 61 62- (id) initWithTreeAdaptor:(id<TreeAdaptor>)aTreeAdaptor description:(NSString *)anElementDescription 63{ 64 if ((self = [super initWithTreeAdaptor:aTreeAdaptor description:anElementDescription]) != nil) { 65 dirty = NO; 66 isSingleElement = YES; 67 } 68 return self; 69} 70 71- (id) initWithTreeAdaptor:(id<TreeAdaptor>)aTreeAdaptor description:(NSString *)anElementDescription element:(id)anElement 72{ 73 if ((self = [super initWithTreeAdaptor:aTreeAdaptor description:anElementDescription element:anElement]) != nil) { 74 dirty = NO; 75 } 76 return self; 77} 78 79- (id) initWithTreeAdaptor:(id<TreeAdaptor>)aTreeAdaptor description:(NSString *)anElementDescription elements:(NSArray *)theElements 80{ 81 if ((self = [super initWithTreeAdaptor:aTreeAdaptor description:anElementDescription elements:theElements]) != nil) { 82 dirty = NO; 83 } 84 return self; 85} 86 87 88- (id) nextNode 89{ 90 if (dirty || (cursor >= [self size] && [self size] == 1)) 91 return [treeAdaptor dupNode:[self _next]]; 92 else 93 return [self _next]; 94} 95 96- (id) dup:(id)element 97{ 98 return [treeAdaptor dupTree:element]; 99} 100 101@end 102