/*
 *  Copyright 2007 Adrian Thurston <thurston@complang.org>
 */
/*  This file is part of Ragel.
 *
 *  Ragel is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 * 
 *  Ragel is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with Ragel; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */
#ifndef _RLSCAN_H
#define _RLSCAN_H
#include <iostream>
#include "rlscan.h"
#include "vector.h"
#include "rlparse.h"
#include "parsedata.h"
#include "avltree.h"
#include "vector.h"
using std::istream;
using std::ostream;
extern char *Parser_lelNames[];
struct Scanner : TmpObject<Scanner>
{
        Scanner( InputData &id, const char *fileName, istream &input,
                        Parser *inclToParser, char *inclSectionTarg,
                        int includeDepth, bool importMachines )
        : 
                id(id), fileName(fileName), 
                input(input),
                inclToParser(inclToParser),
                inclSectionTarg(inclSectionTarg),
                includeDepth(includeDepth),
                importMachines(importMachines),
                cur_token(0),
                line(1), column(1), lastnl(0), 
                parser(0), ignoreSection(false), 
                parserExistsError(false),
                whitespaceOn(true),
                lastToken(0)
                {}
        bool duplicateInclude( char *inclFileName, char *inclSectionName );
        /* Make a list of places to look for an included file. */
        char **makeIncludePathChecks( const char *curFileName, const char *fileName, int len );
        std::ifstream *tryOpenInclude( char **pathChecks, long &found );
        void handleMachine();
        void handleInclude();
        void handleImport();
        void init();
        void token( int type, char *start, char *end );
        void token( int type, char c );
        void token( int type );
        void processToken( int type, char *tokdata, int toklen );
        void directToParser( Parser *toParser, const char *tokFileName, int tokLine, 
                int tokColumn, int type, char *tokdata, int toklen );
        void flushImport( );
        void importToken( int type, char *start, char *end );
        void pass( int token, char *start, char *end );
        void pass();
        void updateCol();
        void startSection();
        void endSection();
        void do_scan();
        bool active();
        ostream &scan_error();
        InputData &id;
        const char *fileName;
        istream &input;
        Parser *inclToParser;
        char *inclSectionTarg;
        int includeDepth;
        bool importMachines;
        /* For import parsing. */
        int tok_cs, tok_act;
        int *tok_ts, *tok_te;
        int cur_token;
        static const int max_tokens = 32;
        int token_data[max_tokens];
        char *token_strings[max_tokens];
        int token_lens[max_tokens];
        /* For section processing. */
        int cs;
        char *word, *lit;
        int word_len, lit_len;
        /* For character scanning. */
        int line;
        InputLoc sectionLoc;
        char *ts, *te;
        int column;
        char *lastnl;
        /* Set by machine statements, these persist from section to section
         * allowing for unnamed sections. */
        Parser *parser;
        bool ignoreSection;
        /* This is set if ragel has already emitted an error stating that
         * no section name has been seen and thus no parser exists. */
        bool parserExistsError;
        /* This is for inline code. By default it is on. It goes off for
         * statements and values in inline blocks which are parsed. */
        bool whitespaceOn;
        /* Keeps a record of the previous token sent to the section parser. */
        int lastToken;
};
#endif