/*
* Line attribute cache
* Copyright
* (C) 2006 Joseph H. Allen
*
* This file is part of JOE (Joe's Own Editor)
*/
struct lattr_db
{
struct lattr_db *next; /* Linked list of attribute databases owned by a B */
struct high_syntax *syn; /* This database is for this syntax */
B *b; /* This database is for this buffer */
/* Use a gap buffer for the attribute records */
HIGHLIGHT_STATE *buffer; /* Address of buffer */
ptrdiff_t hole; /* Offset to hole */
ptrdiff_t ehole; /* Offset to end of hole */
ptrdiff_t end; /* Malloc() size of buffer */
ptrdiff_t first_invalid; /* Lines beginning with this are invalid */
ptrdiff_t invalid_window; /* Lines beyond first_invalid+invalid_window might be valid */
/* -1 means all lines are valid */
};
struct lattr_db *mk_lattr_db(B *new_b, struct high_syntax *new_syn);
/* Create database structure */
void rm_lattr_db(struct lattr_db *db);
/* Delete database structure */
void rm_all_lattr_db(struct lattr_db *db);
/* Delete linked-list of databases */
void reset_all_lattr_db(struct lattr_db *db);
/* Delete linked-list of databases */
struct lattr_db *find_lattr_db(B *b, struct high_syntax *y);
/* Find database for a particular syntax. If one doesn't
exist, create it and add it to the list for the B */
void drop_lattr_db(B *b, struct lattr_db *db);
/* Drop a database if it's no longer needed. This checks through all BWs on a B
to see if any of them refer to db. If none, the db is dropped. */
#define lattr_size(db) ((db)->end - ((db)->ehole - (db)->hole))
void lattr_hole(struct lattr_db *db, ptrdiff_t pos);
/* Set hole position */
void lattr_check(struct lattr_db *db, ptrdiff_t size);
/* Make sure we have enough space for insert. If not, expand buffer. */
void lattr_ins(struct lattr_db *db,ptrdiff_t line,ptrdiff_t size);
/* An insert occured, beginning on specified line. 'size' lines were inserted.
Adjust invalid window to cover inserted area.
*/
void lattr_del(struct lattr_db *db,ptrdiff_t line,ptrdiff_t size);
/* A deletion occured, beginning on specified line. 'size' lines were deleted.
Adjust invalid window to cover deleted area.
*/
HIGHLIGHT_STATE lattr_get(struct lattr_db *db,struct high_syntax *y,P *p,ptrdiff_t line);
/* Get state for specified line. If we don't have it, compute it.
Records results of any computation so that we don't have to do it again.
If first_invalid is < number of lines we have, compute forward until we
start matching again as this is a very common case. */
#define lattr_lvalue(db, line) ((line) >= (db)->hole ? (db)->buffer[(line) - (db)->hole + (db)->ehole] : (db)->buffer[line])
