174 lines
6.3 KiB
C++
174 lines
6.3 KiB
C++
// This is part of the iostream library, providing input/output for C++.
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// Copyright (C) 1991 Per Bothner.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free
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// Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifndef _EDITBUF_H
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#define _EDITBUF_H
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#ifdef __GNUG__
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#pragma interface
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#endif
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#include <stdio.h>
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#include <fstream.h>
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typedef unsigned long mark_pointer;
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// At some point, it might be nice to parameterize this code
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// in terms of buf_char.
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typedef /*unsigned*/ char buf_char;
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// Logical pos from start of buffer (does not count gap).
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typedef long buf_index;
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// Pos from start of buffer, possibly including gap_size.
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typedef long buf_offset;
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#if 0
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struct buf_cookie {
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FILE *file;
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struct edit_string *str;
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struct buf_cookie *next;
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buf_index tell();
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};
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#endif
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struct edit_buffer;
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struct edit_mark;
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// A edit_string is defined as the region between the 'start' and 'end' marks.
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// Normally (always?) 'start->insert_before()' should be false,
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// and 'end->insert_before()' should be true.
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struct edit_string {
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struct edit_buffer *buffer; // buffer that 'start' and 'end' belong to
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struct edit_mark *start, *end;
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int length() const; // count of buf_chars currently in string
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edit_string(struct edit_buffer *b,
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struct edit_mark *ms, struct edit_mark *me)
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{ buffer = b; start = ms; end = me; }
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/* Make a fresh, contiguous copy of the data in STR.
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Assign length of STR to *LENP.
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(Output has extra NUL at out[*LENP].) */
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buf_char *copy_bytes(int *lenp) const;
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// FILE *open_file(char *mode);
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void assign(struct edit_string *src); // copy bytes from src to this
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};
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struct edit_streambuf : public streambuf {
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friend edit_buffer;
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edit_string *str;
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edit_streambuf* next; // Chain of edit_streambuf's for a edit_buffer.
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short _mode;
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edit_streambuf(edit_string* bstr, int mode);
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~edit_streambuf();
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virtual int underflow();
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virtual int overflow(int c = EOF);
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virtual streampos seekoff(streamoff, _seek_dir, int mode=ios::in|ios::out);
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void flush_to_buffer();
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void flush_to_buffer(edit_buffer* buffer);
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int _inserting;
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int inserting() { return _inserting; }
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void inserting(int i) { _inserting = i; }
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// int delete_chars(int count, char* cut_buf); Not implemented.
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int truncate();
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int is_reading() { return gptr() != NULL; }
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buf_char* current() { return is_reading() ? gptr() : pptr(); }
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void set_current(char *p, int is_reading);
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protected:
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void disconnect_gap_from_file(edit_buffer* buffer);
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};
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// A 'edit_mark' indicates a position in a buffer.
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// It is "attached" the text (rather than the offset).
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// There are two kinds of mark, which have different behavior
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// when text is inserted at the mark:
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// If 'insert_before()' is true the mark will be adjusted to be
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// *after* the new text.
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struct edit_mark {
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struct edit_mark *chain;
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mark_pointer _pos;
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inline int insert_before() { return _pos & 1; }
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inline unsigned long index_in_buffer(struct edit_buffer *buffer)
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{ return _pos >> 1; }
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inline buf_char *ptr(struct edit_buffer *buf);
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buf_index tell();
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edit_mark() { }
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edit_mark(struct edit_string *str, long delta);
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edit_buffer *buffer();
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~edit_mark();
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};
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// A 'edit_buffer' consists of a sequence of buf_chars (the data),
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// a list of edit_marks pointing into the data, and a list of FILEs
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// also pointing into the data.
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// A 'edit_buffer' coerced to a edit_string is the string of
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// all the buf_chars in the buffer.
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// This implementation uses a conventional buffer gap (as in Emacs).
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// The gap start is defined by de-referencing a (buf_char**).
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// This is because sometimes a FILE is inserting into the buffer,
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// so rather than having each putc adjust the gap, we use indirection
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// to have the gap be defined as the write pointer of the FILE.
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// (This assumes that putc adjusts a pointer (as in GNU's libc), not an index.)
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struct edit_buffer {
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buf_char *data; /* == emacs buffer_text.p1+1 */
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buf_char *_gap_start;
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edit_streambuf* _writer; // If non-NULL, currently writing stream
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inline buf_char *gap_start()
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{ return _writer ? _writer->pptr() : _gap_start; }
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buf_offset __gap_end_pos; // size of part 1 + size of gap
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/* int gap; implicit: buf_size - size1 - size2 */
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int buf_size;
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struct edit_streambuf *files;
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struct edit_mark start_mark;
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struct edit_mark end_mark;
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edit_buffer();
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inline buf_offset gap_end_pos() { return __gap_end_pos; }
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inline struct edit_mark *start_marker() { return &start_mark; }
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inline struct edit_mark *end_marker() { return &end_mark; }
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/* these should be protected, ultimately */
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buf_index tell(edit_mark*);
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buf_index tell(buf_char*);
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inline buf_char *gap_end() { return data + gap_end_pos(); }
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inline int gap_size() { return gap_end() - gap_start(); }
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inline int size1() { return gap_start() - data; }
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inline int size2() { return buf_size - gap_end_pos(); }
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inline struct edit_mark * mark_list() { return &start_mark; }
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void make_gap (buf_offset);
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void move_gap (buf_offset pos);
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void move_gap (buf_char *pos) { move_gap(pos - data); }
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void gap_left (int pos);
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void gap_right (int pos);
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void adjust_markers(mark_pointer low, mark_pointer high,
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int amount, buf_char *old_data);
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void delete_range(buf_index from, buf_index to);
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void delete_range(struct edit_mark *start, struct edit_mark *end);
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};
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extern buf_char * bstr_copy(struct edit_string *str, int *lenp);
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// Convert a edit_mark to a (buf_char*)
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inline buf_char *edit_mark::ptr(struct edit_buffer *buf)
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{ return buf->data + index_in_buffer(buf); }
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inline void edit_streambuf::flush_to_buffer()
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{
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edit_buffer* buffer = str->buffer;
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if (buffer->_writer == this) flush_to_buffer(buffer);
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}
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#endif /* !_EDITBUF_H*/
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