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1//
2//  ANTLRUnbufferedTokenStream.m
3//  ANTLR
4//
5//  Created by Alan Condit on 7/12/10.
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 "ANTLRUnbufferedTokenStream.h"
33
34@implementation ANTLRUnbufferedTokenStream
35
36@synthesize tokenSource;
37@synthesize tokenIndex;
38@synthesize channel;
39
40+ (ANTLRUnbufferedTokenStream *)newANTLRUnbufferedTokenStream:(id<ANTLRTokenSource>)aTokenSource
41{
42    return [[ANTLRUnbufferedTokenStream alloc] initWithTokenSource:aTokenSource];
43}
44
45- (id) init
46{
47    if ((self = [super init]) != nil) {
48        tokenSource = nil;
49        tokenIndex = 0;
50        channel = ANTLRTokenChannelDefault;
51    }
52    return self;
53}
54
55- (id) initWithTokenSource:(id<ANTLRTokenSource>)aTokenSource
56{
57    if ((self = [super init]) != nil) {
58        tokenSource = aTokenSource;
59        if ( tokenSource ) [tokenSource retain];
60        tokenIndex = 0;
61        channel = ANTLRTokenChannelDefault;
62    }
63    return self;
64}
65
66- (void) dealloc
67{
68#ifdef DEBUG_DEALLOC
69    NSLog( @"called dealloc in ANTLRUnbufferedTokenStream" );
70#endif
71    if ( tokenSource ) [tokenSource release];
72    [super dealloc];
73}
74
75- (id<ANTLRToken>)nextElement
76{
77    id<ANTLRToken> t = [tokenSource nextToken];
78    [t setTokenIndex:tokenIndex++];
79    return t;
80}
81
82- (BOOL)isEOF:(id<ANTLRToken>)aToken
83{
84    return (aToken.type == ANTLRTokenTypeEOF);
85}
86
87- (id<ANTLRTokenSource>)getTokenSource
88{
89    return tokenSource;
90}
91
92- (NSString *)toStringFromStart:(NSInteger)aStart ToEnd:(NSInteger)aStop
93{
94    return @"n/a";
95}
96
97- (NSString *)toStringFromToken:(id<ANTLRToken>)aStart ToEnd:(id<ANTLRToken>)aStop
98{
99    return @"n/a";
100}
101
102- (NSInteger)LA:(NSInteger)anIdx
103{
104    return [[self LT:anIdx] type];
105}
106
107- (id<ANTLRToken>)objectAtIndex:(NSInteger)anIdx
108{
109    @throw [ANTLRRuntimeException newException:@"Absolute token indexes are meaningless in an unbuffered stream"];
110}
111
112- (NSString *)getSourceName
113{
114    return [tokenSource getSourceName];
115}
116
117
118@end
119