| // |
| // ANTLRUnbufferedTokenStream.m |
| // ANTLR |
| // |
| // Created by Alan Condit on 7/12/10. |
| // [The "BSD licence"] |
| // Copyright (c) 2010 Alan Condit |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions |
| // are met: |
| // 1. Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // 2. Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // 3. The name of the author may not be used to endorse or promote products |
| // derived from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #import "ANTLRUnbufferedTokenStream.h" |
| |
| @implementation ANTLRUnbufferedTokenStream |
| |
| @synthesize tokenSource; |
| @synthesize tokenIndex; |
| @synthesize channel; |
| |
| + (ANTLRUnbufferedTokenStream *)newANTLRUnbufferedTokenStream:(id<ANTLRTokenSource>)aTokenSource |
| { |
| return [[ANTLRUnbufferedTokenStream alloc] initWithTokenSource:aTokenSource]; |
| } |
| |
| - (id) init |
| { |
| if ((self = [super init]) != nil) { |
| tokenSource = nil; |
| tokenIndex = 0; |
| channel = ANTLRTokenChannelDefault; |
| } |
| return self; |
| } |
| |
| - (id) initWithTokenSource:(id<ANTLRTokenSource>)aTokenSource |
| { |
| if ((self = [super init]) != nil) { |
| tokenSource = aTokenSource; |
| if ( tokenSource ) [tokenSource retain]; |
| tokenIndex = 0; |
| channel = ANTLRTokenChannelDefault; |
| } |
| return self; |
| } |
| |
| - (void) dealloc |
| { |
| #ifdef DEBUG_DEALLOC |
| NSLog( @"called dealloc in ANTLRUnbufferedTokenStream" ); |
| #endif |
| if ( tokenSource ) [tokenSource release]; |
| [super dealloc]; |
| } |
| |
| - (id<ANTLRToken>)nextElement |
| { |
| id<ANTLRToken> t = [tokenSource nextToken]; |
| [t setTokenIndex:tokenIndex++]; |
| return t; |
| } |
| |
| - (BOOL)isEOF:(id<ANTLRToken>)aToken |
| { |
| return (aToken.type == ANTLRTokenTypeEOF); |
| } |
| |
| - (id<ANTLRTokenSource>)getTokenSource |
| { |
| return tokenSource; |
| } |
| |
| - (NSString *)toStringFromStart:(NSInteger)aStart ToEnd:(NSInteger)aStop |
| { |
| return @"n/a"; |
| } |
| |
| - (NSString *)toStringFromToken:(id<ANTLRToken>)aStart ToEnd:(id<ANTLRToken>)aStop |
| { |
| return @"n/a"; |
| } |
| |
| - (NSInteger)LA:(NSInteger)anIdx |
| { |
| return [[self LT:anIdx] type]; |
| } |
| |
| - (id<ANTLRToken>)objectAtIndex:(NSInteger)anIdx |
| { |
| @throw [ANTLRRuntimeException newException:@"Absolute token indexes are meaningless in an unbuffered stream"]; |
| } |
| |
| - (NSString *)getSourceName |
| { |
| return [tokenSource getSourceName]; |
| } |
| |
| |
| @end |