// [The "BSD licence"]
// Copyright (c) 2006-2007 Kay Roepke 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
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// (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 "IntStream.h"

#define	CharStreamEOF -1


@protocol CharStream < IntStream >

/** For infinite streams, you don't need this; primarily I'm providing
 *  a useful interface for action code.  Just make sure actions don't
 *  use this on streams that don't support it.
 */
- (NSString *) substringWithRange:(NSRange) theRange;

/** Get the ith character of lookahead.  This is the same usually as
 *  LA(i).  This will be used for labels in the generated
 *  lexer code.  I'd prefer to return a char here type-wise, but it's
 *  probably better to be 32-bit clean and be consistent with LA.
 */
- (NSInteger)LT:(NSInteger) i;

// ANTLR tracks the line information automatically
- (NSInteger)getLine;
// Because this stream can rewind, we need to be able to reset the line
- (void)setLine:(NSInteger)aLine;

- (void)setCharPositionInLine:(NSInteger)pos;


// The index of the character relative to the beginning of the line 0..n-1
- (NSInteger)getCharPositionInLine;

@end