tracker.c
3.04 KB
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#include <stdlib.h>
#include <errno.h>
#include <mailutils/types.h>
#include <mailutils/locus.h>
struct mu_locus_track
{
char const *file_name; /* Name of the source file */
size_t max_lines; /* Max. number of lines history kept by tracker */
size_t head; /* Bottom of stack */
size_t level; /* Number of elements on stack */
unsigned hline; /* Number of line corresponding to cols[head] */
unsigned *cols; /* Cyclic stack */
};
int
mu_locus_track_create (mu_locus_track_t *ret,
char const *file_name, size_t max_lines)
{
int rc;
struct mu_locus_track *trk;
trk = malloc (sizeof *trk);
if (!trk)
return errno;
trk->cols = calloc (max_lines, sizeof (trk->cols[0]));
if (!trk->cols)
{
rc = errno;
free (trk);
return rc;
}
rc = mu_ident_ref (file_name, &trk->file_name);
if (rc)
{
free (trk->cols);
free (trk);
return rc;
}
trk->max_lines = max_lines;
trk->head = 0;
trk->level = 0;
trk->hline = 1;
trk->cols[0] = 0;
*ret = trk;
return 0;
}
void
mu_locus_track_free (mu_locus_track_t trk)
{
if (trk)
{
mu_ident_deref (trk->file_name);
free (trk->cols);
free (trk);
}
}
void
mu_locus_track_destroy (mu_locus_track_t *trk)
{
if (trk)
{
mu_locus_track_free (*trk);
*trk = NULL;
}
}
size_t
mu_locus_track_level (mu_locus_track_t trk)
{
return trk->level;
}
static inline unsigned *
cols_tos_ptr (mu_locus_track_t trk)
{
return &trk->cols[(trk->head + trk->level) % trk->max_lines];
}
static inline unsigned
cols_peek (mu_locus_track_t trk, size_t n)
{
return trk->cols[(trk->head + n) % trk->max_lines];
}
static inline unsigned *
push (mu_locus_track_t trk)
{
unsigned *ptr;
if (trk->level == trk->max_lines)
{
trk->head++;
trk->hline++;
}
else
trk->level++;
*(ptr = cols_tos_ptr (trk)) = 0;
return ptr;
}
static inline unsigned *
pop (mu_locus_track_t trk)
{
if (trk->level == 0)
{
*cols_tos_ptr (trk) = 0;
return NULL; //FIXME
}
trk->level--;
return cols_tos_ptr (trk);
}
void
mu_locus_tracker_advance (struct mu_locus_track *trk,
struct mu_locus_range *loc,
char const *text, size_t leng)
{
unsigned *ptr;
if (text == NULL || leng == 0)
return;
loc->beg.mu_file = loc->end.mu_file = trk->file_name;
loc->beg.mu_line = trk->hline + trk->level;
ptr = cols_tos_ptr (trk);
loc->beg.mu_col = *ptr + 1;
while (leng--)
{
(*ptr)++;
if (*text == '\n')
ptr = push (trk);
text++;
}
if (*ptr)
{
loc->end.mu_line = trk->hline + trk->level;
loc->end.mu_col = *ptr;
}
else
{
loc->end.mu_line = trk->hline + trk->level - 1;
loc->end.mu_col = cols_peek (trk, trk->level - 1) - 1;
}
}
void
mu_locus_tracker_retreat (struct mu_locus_track *trk, size_t n)
{
unsigned *ptr;
ptr = cols_tos_ptr (trk);
while (n--)
{
if (*ptr == 0)
{
ptr = pop (trk);
if (!ptr)
break;
}
--*ptr;
}
}