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      1 //
      2 //  ANTLRLookaheadStream.h
      3 //  ANTLR
      4 //
      5 //  Created by Ian Michell on 26/04/2010.
      6 //  [The "BSD licence"]
      7 //  Copyright (c) 2010 Ian Michell 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 <Cocoa/Cocoa.h>
     33 #import "ANTLRFastQueue.h"
     34 
     35 #define UNITIALIZED_EOF_ELEMENT_INDEX NSIntegerMax
     36 
     37 @interface ANTLRLookaheadStream : ANTLRFastQueue
     38 {
     39     NSInteger index;
     40 	NSInteger eofElementIndex;
     41 	NSInteger lastMarker;
     42 	NSInteger markDepth;
     43 	id prevElement;
     44 	id eof;
     45 }
     46 
     47 @property (readwrite, retain, getter=getEof, setter=setEof:) id eof;
     48 @property (assign) NSInteger index;
     49 @property (assign, getter=getEofElementIndex, setter=setEofElementIndex:) NSInteger eofElementIndex;
     50 @property (assign, getter=getLastMarker, setter=setLastMarker:) NSInteger lastMarker;
     51 @property (assign, getter=getMarkDepth, setter=setMarkDepth:) NSInteger markDepth;
     52 @property (retain) id prevElement;
     53 
     54 - (id) initWithEOF:(id) obj;
     55 - (id) nextElement;
     56 - (id) remove;
     57 - (void) consume;
     58 - (void) sync:(NSInteger) need;
     59 - (void) fill:(NSInteger) n;
     60 - (id) LT:(NSInteger) i;
     61 - (id) LB:(NSInteger) i;
     62 - (id) getCurrentSymbol;
     63 - (NSInteger) mark;
     64 - (void) release:(NSInteger) marker;
     65 - (void) rewind:(NSInteger) marker;
     66 - (void) rewind;
     67 - (void) seek:(NSInteger) i;
     68 - (id) getEof;
     69 - (void) setEof:(id) anID;
     70 - (NSInteger) getEofElementIndex;
     71 - (void) setEofElementIndex:(NSInteger) anInt;
     72 - (NSInteger) getLastMarker;
     73 - (void) setLastMarker:(NSInteger) anInt;
     74 - (NSInteger) getMarkDepth;
     75 - (void) setMarkDepth:(NSInteger) anInt;
     76 
     77 @end
     78