186 lines
6.7 KiB
C++
186 lines
6.7 KiB
C++
/* This is part of libio/iostream, providing -*- C++ -*- input/output.
|
|
Copyright (C) 1993, 2000 Free Software Foundation
|
|
|
|
This file is part of the GNU IO Library. This library 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, or (at your option)
|
|
any later version.
|
|
|
|
This library 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 library; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
As a special exception, if you link this library with files
|
|
compiled with a GNU compiler to produce an executable, this does not cause
|
|
the resulting executable to be covered by the GNU General Public License.
|
|
This exception does not however invalidate any other reasons why
|
|
the executable file might be covered by the GNU General Public License.
|
|
|
|
Written by Per Bothner (bothner@cygnus.com). */
|
|
|
|
#ifndef _EDITBUF_H
|
|
#define _EDITBUF_H
|
|
#ifdef __GNUG__
|
|
#pragma interface
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <fstream.h>
|
|
|
|
extern "C++" {
|
|
typedef unsigned long mark_pointer;
|
|
// At some point, it might be nice to parameterize this code
|
|
// in terms of buf_char.
|
|
typedef /*unsigned*/ char buf_char;
|
|
|
|
// Logical pos from start of buffer (does not count gap).
|
|
typedef long buf_index;
|
|
|
|
// Pos from start of buffer, possibly including gap_size.
|
|
typedef long buf_offset;
|
|
|
|
#if 0
|
|
struct buf_cookie {
|
|
FILE *file;
|
|
struct edit_string *str;
|
|
struct buf_cookie *next;
|
|
buf_index tell();
|
|
};
|
|
#endif
|
|
|
|
struct edit_buffer;
|
|
struct edit_mark;
|
|
|
|
// A edit_string is defined as the region between the 'start' and 'end' marks.
|
|
// Normally (always?) 'start->insert_before()' should be false,
|
|
// and 'end->insert_before()' should be true.
|
|
|
|
struct edit_string {
|
|
struct edit_buffer *buffer; // buffer that 'start' and 'end' belong to
|
|
struct edit_mark *start, *end;
|
|
int length() const; // count of buf_chars currently in string
|
|
edit_string(struct edit_buffer *b,
|
|
struct edit_mark *ms, struct edit_mark *me)
|
|
{ buffer = b; start = ms; end = me; }
|
|
/* Make a fresh, contiguous copy of the data in STR.
|
|
Assign length of STR to *LENP.
|
|
(Output has extra NUL at out[*LENP].) */
|
|
buf_char *copy_bytes(int *lenp) const;
|
|
// FILE *open_file(char *mode);
|
|
void assign(struct edit_string *src); // copy bytes from src to this
|
|
};
|
|
|
|
struct edit_streambuf : public streambuf {
|
|
friend class edit_buffer;
|
|
edit_string *str;
|
|
edit_streambuf* next; // Chain of edit_streambuf's for a edit_buffer.
|
|
short _mode;
|
|
edit_streambuf(edit_string* bstr, int mode);
|
|
~edit_streambuf();
|
|
virtual int underflow();
|
|
virtual int overflow(int c = EOF);
|
|
virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
|
|
void flush_to_buffer();
|
|
void flush_to_buffer(edit_buffer* buffer);
|
|
int _inserting;
|
|
int inserting() { return _inserting; }
|
|
void inserting(int i) { _inserting = i; }
|
|
// int delete_chars(int count, char* cut_buf); Not implemented.
|
|
int truncate();
|
|
int is_reading() { return gptr() != NULL; }
|
|
buf_char* current() { return is_reading() ? gptr() : pptr(); }
|
|
void set_current(char *p, int is_reading);
|
|
protected:
|
|
void disconnect_gap_from_file(edit_buffer* buffer);
|
|
};
|
|
|
|
// A 'edit_mark' indicates a position in a buffer.
|
|
// It is "attached" the text (rather than the offset).
|
|
// There are two kinds of mark, which have different behavior
|
|
// when text is inserted at the mark:
|
|
// If 'insert_before()' is true the mark will be adjusted to be
|
|
// *after* the new text.
|
|
|
|
struct edit_mark {
|
|
struct edit_mark *chain;
|
|
mark_pointer _pos;
|
|
inline int insert_before() { return _pos & 1; }
|
|
inline unsigned long index_in_buffer(struct edit_buffer *)
|
|
{ return _pos >> 1; }
|
|
inline buf_char *ptr(struct edit_buffer *buf);
|
|
buf_index tell();
|
|
edit_mark() { }
|
|
edit_mark(struct edit_string *str, long delta);
|
|
edit_buffer *buffer();
|
|
~edit_mark();
|
|
};
|
|
|
|
// A 'edit_buffer' consists of a sequence of buf_chars (the data),
|
|
// a list of edit_marks pointing into the data, and a list of FILEs
|
|
// also pointing into the data.
|
|
// A 'edit_buffer' coerced to a edit_string is the string of
|
|
// all the buf_chars in the buffer.
|
|
|
|
// This implementation uses a conventional buffer gap (as in Emacs).
|
|
// The gap start is defined by de-referencing a (buf_char**).
|
|
// This is because sometimes a FILE is inserting into the buffer,
|
|
// so rather than having each putc adjust the gap, we use indirection
|
|
// to have the gap be defined as the write pointer of the FILE.
|
|
// (This assumes that putc adjusts a pointer (as in GNU's libc), not an index.)
|
|
|
|
struct edit_buffer {
|
|
buf_char *data; /* == emacs buffer_text.p1+1 */
|
|
buf_char *_gap_start;
|
|
edit_streambuf* _writer; // If non-NULL, currently writing stream
|
|
inline buf_char *gap_start()
|
|
{ return _writer ? _writer->pptr() : _gap_start; }
|
|
buf_offset __gap_end_pos; // size of part 1 + size of gap
|
|
/* int gap; implicit: buf_size - size1 - size2 */
|
|
int buf_size;
|
|
struct edit_streambuf *files;
|
|
struct edit_mark start_mark;
|
|
struct edit_mark end_mark;
|
|
edit_buffer();
|
|
inline buf_offset gap_end_pos() { return __gap_end_pos; }
|
|
inline struct edit_mark *start_marker() { return &start_mark; }
|
|
inline struct edit_mark *end_marker() { return &end_mark; }
|
|
/* these should be protected, ultimately */
|
|
buf_index tell(edit_mark*);
|
|
buf_index tell(buf_char*);
|
|
inline buf_char *gap_end() { return data + gap_end_pos(); }
|
|
inline int gap_size() { return gap_end() - gap_start(); }
|
|
inline int size1() { return gap_start() - data; }
|
|
inline int size2() { return buf_size - gap_end_pos(); }
|
|
inline struct edit_mark * mark_list() { return &start_mark; }
|
|
void make_gap (buf_offset);
|
|
void move_gap (buf_offset pos);
|
|
void move_gap (buf_char *pos) { move_gap(pos - data); }
|
|
void gap_left (int pos);
|
|
void gap_right (int pos);
|
|
void adjust_markers(mark_pointer low, mark_pointer high,
|
|
int amount, buf_char *old_data);
|
|
void delete_range(buf_index from, buf_index to);
|
|
void delete_range(struct edit_mark *start, struct edit_mark *end);
|
|
};
|
|
|
|
extern buf_char * bstr_copy(struct edit_string *str, int *lenp);
|
|
|
|
// Convert a edit_mark to a (buf_char*)
|
|
|
|
inline buf_char *edit_mark::ptr(struct edit_buffer *buf)
|
|
{ return buf->data + index_in_buffer(buf); }
|
|
|
|
inline void edit_streambuf::flush_to_buffer()
|
|
{
|
|
edit_buffer* buffer = str->buffer;
|
|
if (buffer->_writer == this) flush_to_buffer(buffer);
|
|
}
|
|
} // extern "C++"
|
|
#endif /* !_EDITBUF_H*/
|
|
|