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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