1 // 2 // LookaheadStream.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 <Foundation/Foundation.h> 33 #import "FastQueue.h" 34 35 #define UNITIALIZED_EOF_ELEMENT_INDEX NSIntegerMax 36 37 @interface LookaheadStream : FastQueue 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