1 files changed, 58 insertions, 0 deletions

diff --git a/src/experimental/lexer.h b/src/experimental/lexer.h
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+++ b/src/experimental/lexer.h
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+/*
+ * 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