textfile.h

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/* 
 *      HT Editor
 *      textfile.h
 *
 *      Copyright (C) 1999-2002 Stefan Weyergraf (stefan@weyergraf.de)
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License version 2 as
 *      published by the Free Software Foundation.
 *
 *      This program 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 this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __TEXTFILE_H__
#define __TEXTFILE_H__

#include "htdata.h"
#include "stream.h"
#include "syntax.h"

/*
 *      CLASS ht_textfile
 */
 
class ht_textfile: public ht_layer_streamfile {
public:
/* new */
        virtual bool convert_ofs2line(FILEOFS o, UINT *line, UINT *pofs)=0;
        virtual bool convert_line2ofs(UINT line, UINT pofs, FILEOFS *o)=0;
        virtual void delete_lines(UINT line, UINT count)=0;
        virtual void delete_chars(UINT line, UINT ofs, UINT count)=0;
        virtual bool get_char(UINT line, char *ch, UINT pos)=0;
        virtual bool getline(UINT line, UINT pofs, void *buf, UINT buflen, UINT *retlen, lexer_state *state)=0;
        virtual UINT getlinelength(UINT line)=0;
        virtual void insert_lines(UINT before, UINT count, void **line_ends = NULL, int *lineendlens = NULL)=0;
        virtual void insert_chars(UINT line, UINT ofs, void *chars, UINT len)=0;
        virtual bool has_line(UINT line)=0;
        virtual UINT linecount()=0;
        virtual void set_layered_assume(ht_streamfile *streamfile, bool changes_applied)=0;
        virtual void set_lexer(ht_syntax_lexer *lexer)=0;
};

/*
 *      CLASS ht_layer_textfile
 */
 
class ht_layer_textfile: public ht_textfile {
public:
                        void init(ht_textfile *textfile, bool own_textfile);
/* overwritten */
        virtual bool convert_ofs2line(FILEOFS o, UINT *line, UINT *pofs);
        virtual bool convert_line2ofs(UINT line, UINT pofs, FILEOFS *o);
        virtual void delete_lines(UINT line, UINT count);
        virtual void delete_chars(UINT line, UINT ofs, UINT count);
        virtual bool get_char(UINT line, char *ch, UINT pos);
        virtual bool getline(UINT line, UINT pofs, void *buf, UINT buflen, UINT *retlen, lexer_state *state);
        virtual UINT getlinelength(UINT line);
        virtual void insert_lines(UINT before, UINT count, void **line_ends, int *lineendlens);
        virtual void insert_chars(UINT line, UINT ofs, void *chars, UINT len);
        virtual bool has_line(UINT line);
        virtual UINT linecount();
        virtual void set_layered_assume(ht_streamfile *streamfile, bool changes_applied);
        virtual void set_lexer(ht_syntax_lexer *lexer);
};

/*
 *      CLASS ht_ltextfile_line
 */

class ht_ltextfile_line: public Object {
public:
        virtual ~ht_ltextfile_line();

        lexer_state instate;
        struct {
                FILEOFS ofs;
                UINT len;
        } on_disk;
        bool is_in_memory;
        struct {
                char *data;
                UINT len;
        } in_memory;
        FILEOFS nofs;
        byte lineendlen;
        byte lineend[2];
};

/*
 *      CLASS ht_ltextfile
 */
 
class ht_ltextfile: public ht_textfile {
protected:
        FILEOFS ofs;
        ht_clist *lines;
        ht_clist *orig_lines;
        ht_syntax_lexer *lexer;
        UINT first_parse_dirty_line;
        UINT first_nofs_dirty_line;
        bool dirty;

                        void cache_invd();
                        void cache_flush();
                        void dirty_nofs(UINT line);
                        void dirty_parse(UINT line);
                        UINT find_linelen_forwd(byte *buf, UINT maxbuflen, FILEOFS ofs, int *le_len);
        virtual ht_ltextfile_line *fetch_line(UINT line);
                        ht_ltextfile_line *fetch_line_nofs_ok(UINT line);
                        ht_ltextfile_line *fetch_line_into_memory(UINT line);
                        UINT getlinelength_i(ht_ltextfile_line *e);
                        bool is_dirty_nofs(UINT line);
                        bool is_dirty_parse(UINT line);
                        byte *match_lineend_forwd(byte *buf, UINT buflen, int *le_len);
                        lexer_state next_instate(UINT line);
                        FILEOFS next_nofs(ht_ltextfile_line *l);
                        void split_line(UINT a, UINT pos, void *line_end, int line_end_len);
                        void update_nofs(UINT line);
                        void update_parse(UINT line);
                        void reread();
public:
                        void    init(ht_streamfile *streamfile, bool own_streamfile, ht_syntax_lexer *lexer);
        virtual void done();
/* overwritten (streamfile) */
        virtual void    copy_to(ht_stream *stream);
        virtual int     extend(UINT newsize);
        virtual UINT    get_size();
        virtual void    pstat(pstat_t *s);
        virtual UINT    read(void *buf, UINT size);
        virtual void set_layered(ht_streamfile *streamfile);
        virtual int     seek(FILEOFS offset);
        virtual FILEOFS tell();
        virtual int     truncate(UINT newsize);
        virtual int     vcntl(UINT cmd, va_list vargs);
        virtual UINT    write(const void *buf, UINT size);
/* overwritten (textfile) */
        virtual bool convert_ofs2line(FILEOFS o, UINT *line, UINT *pofs);
        virtual bool convert_line2ofs(UINT line, UINT pofs, FILEOFS *o);
        virtual void delete_lines(UINT line, UINT count);
        virtual void delete_chars(UINT line, UINT ofs, UINT count);
        virtual bool get_char(UINT line, char *ch, UINT pos);
        virtual bool getline(UINT line, UINT pofs, void *buf, UINT buflen, UINT *retlen, lexer_state *state);
        virtual UINT getlinelength(UINT line);
        virtual void insert_lines(UINT before, UINT count, void **line_ends, int *lineendlens);
        virtual void insert_chars(UINT line, UINT ofs, void *chars, UINT len);
        virtual bool has_line(UINT line);
        virtual UINT linecount();
        virtual void set_layered_assume(ht_streamfile *streamfile, bool changes_applied);
        virtual void set_lexer(ht_syntax_lexer *lexer);
};

#endif /* __TEXTFILE_H__ */

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