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59 lines
2.4 KiB
59 lines
2.4 KiB
// [The "BSD licence"]
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// Copyright (c) 2006-2007 Kay Roepke 2010 Alan Condit
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// 3. The name of the author may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#import "IntStream.h"
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#define CharStreamEOF -1
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@protocol CharStream < IntStream >
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/** For infinite streams, you don't need this; primarily I'm providing
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* a useful interface for action code. Just make sure actions don't
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* use this on streams that don't support it.
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*/
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- (NSString *) substringWithRange:(NSRange) theRange;
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/** Get the ith character of lookahead. This is the same usually as
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* LA(i). This will be used for labels in the generated
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* lexer code. I'd prefer to return a char here type-wise, but it's
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* probably better to be 32-bit clean and be consistent with LA.
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*/
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- (NSInteger)LT:(NSInteger) i;
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// ANTLR tracks the line information automatically
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- (NSInteger)getLine;
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// Because this stream can rewind, we need to be able to reset the line
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- (void)setLine:(NSInteger)aLine;
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- (void)setCharPositionInLine:(NSInteger)pos;
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// The index of the character relative to the beginning of the line 0..n-1
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- (NSInteger)getCharPositionInLine;
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@end
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