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103 lines
4.3 KiB
103 lines
4.3 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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#ifndef DEBUG_DEALLOC
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#define DEBUG_DEALLOC
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#endif
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@protocol IntStream < NSObject, NSCopying >
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- (void) consume;
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// Get unichar at current input pointer + i ahead where i=1 is next character as int for including CharStreamEOF (-1) in the data range
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- (NSInteger) LA:(NSInteger) i;
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// Tell the stream to start buffering if it hasn't already. Return
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// current input position, index(), or some other marker so that
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// when passed to rewind() you get back to the same spot.
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// rewind(mark()) should not affect the input cursor.
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// TODO: problem in that lexer stream returns not index but some marker
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- (NSInteger) mark;
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// Return the current input symbol index 0..n where n indicates the
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// last symbol has been read.
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- (NSInteger) index;
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// Reset the stream so that next call to index would return marker.
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// The marker will usually be -index but it doesn't have to be. It's
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// just a marker to indicate what state the stream was in. This is
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// essentially calling -release: and -seek:. If there are markers
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// created after this marker argument, this routine must unroll them
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// like a stack. Assume the state the stream was in when this marker
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// was created.
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- (void) rewind;
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- (void) rewind:(NSInteger) marker;
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// You may want to commit to a backtrack but don't want to force the
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// stream to keep bookkeeping objects around for a marker that is
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// no longer necessary. This will have the same behavior as
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// rewind() except it releases resources without the backward seek.
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- (void) release:(NSInteger) marker;
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// Set the input cursor to the position indicated by index. This is
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// normally used to seek ahead in the input stream. No buffering is
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// required to do this unless you know your stream will use seek to
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// move backwards such as when backtracking.
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// This is different from rewind in its multi-directional
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// requirement and in that its argument is strictly an input cursor (index).
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//
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// For char streams, seeking forward must update the stream state such
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// as line number. For seeking backwards, you will be presumably
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// backtracking using the mark/rewind mechanism that restores state and
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// so this method does not need to update state when seeking backwards.
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//
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// Currently, this method is only used for efficient backtracking, but
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// in the future it may be used for incremental parsing.
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- (void) seek:(NSInteger) anIndex;
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/** Only makes sense for streams that buffer everything up probably, but
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* might be useful to display the entire stream or for testing. This
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* value includes a single EOF.
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*/
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- (NSUInteger) size;
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/** Where are you getting symbols from? Normally, implementations will
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* pass the buck all the way to the lexer who can ask its input stream
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* for the file name or whatever.
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*/
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- (NSString *)getSourceName;
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//@property (assign) NSInteger index;
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//@property (assign) NSUInteger line;
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//@property (assign) NSUInteger charPositionInLine;
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@end
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