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      1 //
      2 //  ANTLRRewriteRuleSubtreeStream.m
      3 //  ANTLR
      4 //
      5 //  Created by Kay Rpke on 7/16/07.
      6 // [The "BSD licence"]
      7 // Copyright (c) 2007 Kay Rpke 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 "ANTLRRewriteRuleSubtreeStream.h"
     33 
     34 
     35 @implementation ANTLRRewriteRuleSubtreeStream
     36 
     37 + (ANTLRRewriteRuleSubtreeStream*) newANTLRRewriteRuleSubtreeStream:(id<ANTLRTreeAdaptor>)aTreeAdaptor
     38                                                         description:(NSString *)anElementDescription;
     39 {
     40     return [[ANTLRRewriteRuleSubtreeStream alloc] initWithTreeAdaptor:aTreeAdaptor
     41                                                           description:anElementDescription];
     42 }
     43 
     44 + (ANTLRRewriteRuleSubtreeStream*) newANTLRRewriteRuleSubtreeStream:(id<ANTLRTreeAdaptor>)aTreeAdaptor
     45                                                         description:(NSString *)anElementDescription
     46                                                             element:(id)anElement;
     47 {
     48     return [[ANTLRRewriteRuleSubtreeStream alloc] initWithTreeAdaptor:aTreeAdaptor
     49                                                           description:anElementDescription
     50                                                               element:anElement];
     51 }
     52 
     53 + (ANTLRRewriteRuleSubtreeStream*) newANTLRRewriteRuleSubtreeStream:(id<ANTLRTreeAdaptor>)aTreeAdaptor
     54                                                         description:(NSString *)anElementDescription
     55                                                            elements:(NSArray *)theElements;
     56 {
     57     return [[ANTLRRewriteRuleSubtreeStream alloc] initWithTreeAdaptor:aTreeAdaptor
     58                                                           description:anElementDescription
     59                                                              elements:theElements];
     60 }
     61 
     62 - (id) initWithTreeAdaptor:(id<ANTLRTreeAdaptor>)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<ANTLRTreeAdaptor>)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<ANTLRTreeAdaptor>)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