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1 //
2 //  ANTLRLinkBase.m
3 //  ANTLR
4 //
5 //  Created by Alan Condit on 6/14/10.
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 "ANTLRLinkBase.h"
33 
34 @implementation ANTLRLinkBase
35 
36 @synthesize fPrev;
37 @synthesize fNext;
38 
39 +(id<ANTLRLinkList>)newANTLRLinkBase
40 {
41 	return [[ANTLRLinkBase alloc] init];
42 }
43 
44 +(id<ANTLRLinkList>)newANTLRLinkBase:(id<ANTLRLinkList>)np Prev:(id<ANTLRLinkList>)pp
45 {
46 	return [[ANTLRLinkBase alloc] initWithPtr:np Prev:pp];
47 }
48 
49 -(id<ANTLRLinkList>)init
50 {
51 	if ((self = [super init]) != nil) {
52 		fNext = nil;
53 		fPrev = nil;
54 	}
55 	return(self);
56 }
57 
58 -(id<ANTLRLinkList>)initWithPtr:(id<ANTLRLinkList>)np Prev:(id<ANTLRLinkList>)pp
59 {
60 	if ((self = [super init]) != nil) {
61 		fNext = np;
62 		fPrev = pp;
63 	}
64 	return(self);
65 }
66 
67 -(void)dealloc
68 {
69 #ifdef DEBUG_DEALLOC
70     NSLog( @"called dealloc in ANTLRLinkBase" );
71 #endif
72 	if (fNext) [fNext dealloc];
73 	if (fPrev) [fPrev dealloc];
74 	[super dealloc];
75 }
76 
77 - (id) copyWithZone:(NSZone *)aZone
78 {
79     ANTLRLinkBase *copy;
80 
81     copy = [[self class] allocWithZone:aZone];
82     copy.fPrev = fPrev;
83     copy.fNext = fNext;
84     return( copy );
85 }
86 
87 -(id<ANTLRLinkList>)append:(id<ANTLRLinkList>)node
88 {
89 	node.fPrev = (id<ANTLRLinkList>)self;
90 	node.fNext = (id<ANTLRLinkList>)self.fNext;
91 	if (node.fNext != nil)
92         node.fNext.fPrev = node;
93     self.fNext = node;
94     return( node );
95 }
96 
97 -(id<ANTLRLinkList>)insert:(id<ANTLRLinkList>)node
98 {
99 	node.fNext = self;
100 	node.fPrev = self.fPrev;
101     if (node.fPrev != nil)
102         node.fPrev.fNext = node;
103 	self.fPrev = node;
104 	return( node );
105 }
106 
107 -(id<ANTLRLinkList>)getfNext
108 {
109 	return(fNext);
110 }
111 
112 -(void)setfNext:(id<ANTLRLinkList>)np
113 {
114 	fNext = np;
115 }
116 
117 -(id<ANTLRLinkList>)getfPrev
118 {
119 	return(fPrev);
120 }
121 
122 -(void)setfPrev:(id<ANTLRLinkList>)pp
123 {
124 	fPrev = pp;
125 }
126 
127 @end
128