antlrtoken.h

ANTLR(ANother Tool for Language Recognition)它是这样的一种工具

// [The "BSD licence"]
// Copyright (c) 2006 Kay Roepke
// 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,
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// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#import <Cocoa/Cocoa.h>

typedef enum {
	ANTLRTokenTypeEOF = -1,
	ANTLRTokenTypeInvalid,
	ANTLRTokenTypeEOR,
	ANTLRTokenTypeDOWN,
	ANTLRTokenTypeUP,
	ANTLRTokenTypeMIN
} ANTLRTokenType;

typedef enum {
	ANTLRTokenChannelDefault = 0
} ANTLRTokenChannel;


// The abstract Token class
// TODO also provide an ANTLRToken protocol

@interface ANTLRToken : NSObject <NSCopying> {
	int type;			// needed for +eofToken
}

// The singleton eofToken instance.
+ (ANTLRToken *) eofToken;
// The default channel for this class of Tokens
+ (ANTLRTokenChannel) defaultChannel;

// provide hooks to explicitely set the text as opposed to use the indices into the CharStream
- (NSString *) text;
- (void) setText:(NSString *) theText;

- (int) type;
- (void) setType: (int) aType;

// ANTLR v3 provides automatic line and position tracking. Subclasses do not need to
// override these, if they do not want to store line/pos tracking information
- (unsigned int) line;
- (void) setLine: (unsigned int) aLine;

- (unsigned int) charPositionInLine;
- (void) setCharPositionInLine: (unsigned int) aCharPositionInLine;

// explicitely change the channel this Token is on. The default parser implementation
// just sees the defaultChannel
// Common idiom is to put whitespace tokens on channel 99.
- (unsigned int) channel;
- (void) setChannel: (unsigned int) aChannel;

// the index of this Token into the TokenStream
- (unsigned int) tokenIndex;
- (void) setTokenIndex: (unsigned int) aTokenIndex;

// conform to NSCopying
- (id) copyWithZone:(NSZone *)theZone;

@end