//
//  TreePatternLexer.h
//  ANTLR
//
//  Created by Alan Condit on 6/18/10.
// [The "BSD licence"]
// Copyright (c) 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
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (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 <Foundation/Foundation.h>

typedef enum {
	LexerTokenTypeEOF = -1,
	LexerTokenTypeInvalid,
	LexerTokenTypeBEGIN,
	LexerTokenTypeEND,
	LexerTokenTypeID,
	LexerTokenTypeARG,
	LexerTokenTypePERCENT,
	LexerTokenTypeCOLON,
	LexerTokenTypeDOT,
} LexerTokenType;


@interface TreePatternLexer : NSObject {

/** The tree pattern to lex like "(A B C)" */
NSString *pattern;
    
/** Index into input string */
NSInteger p;
    
/** Current char */
NSInteger c;
    
/** How long is the pattern in char? */
NSInteger n;
    
/** Set when token type is ID or ARG (name mimics Java's StreamTokenizer) */
NSMutableData *sval;
__strong char *data;
    
BOOL error;

}

@property (retain) NSString *pattern;
@property (assign) NSInteger p;
@property (assign) NSInteger c;
@property (assign) NSInteger n;
@property (retain, getter=getSval, setter=setSval:) NSMutableData *sval;
@property (assign) char *data;
@property (assign) BOOL error;

+ (TreePatternLexer *)newTreePatternLexer:(NSString *)aPattern;
- (id) init;
- (id) initWithPattern:(NSString *)aPattern;

- (void) dealloc;
- (NSInteger) nextToken;
- (void) consume;
- (NSString *)toString;

- (NSMutableData *)getSval;
- (void) setSval:(NSMutableData *)aSval;

@end
