aboutsummaryrefslogtreecommitdiff
path: root/src/experimental/lexer.h
blob: b057692a91033b6f2428734e410bf4103c91e8ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
/*
 * Copyright (C) 2007-2011 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#ifndef BU_LEXER_H
#define BU_LEXER_H

#include "bu/variant.h"

namespace Bu
{
	class Stream;

	/**
	 * The base class for creating a lexical analyzer.  This is designed to work
	 * in tandem with the Bu::Parser class, which uses this to tokenize textual
	 * input.  It can be used by just about anything that cares about tokens
	 * more than raw input, though.
	 */
	class Lexer
	{
	public:
		Lexer();
		virtual ~Lexer();

		typedef int TokenType;

		class Token
		{
		public:
			Token();
			Token( TokenType iToken );

			template<class t>
			Token( TokenType iToken, const t &v ) :
				iToken( iToken )//,
//				vExtra( v )
			{
				vExtra = v;
			}
			TokenType iToken;
			Bu::Variant vExtra;
			int iStartCol;
			int iStartRow;
			int iEndCol;
			int iEndRow;
		};

		virtual Token *nextToken()=0;

		virtual Bu::String tokenToString( const Token &t );
	};
};

#endif