/* ccl_set_union - create a new ccl as the set union of the two given ccls. */
int
ccl_set_union (int a, int b)
{
int d, i;
/* create new class */
d = cclinit();
/* Add all of a */
for (i = 0; i < ccllen[a]; ++i)
ccladd (d, ccltbl[cclmap[a] + i]);
/* Add all of b */
for (i = 0; i < ccllen[b]; ++i)
ccladd (d, ccltbl[cclmap[b] + i]);
/* debug */
if (0){
fprintf(stderr, "ccl_set_union (%d + %d = %d", a, b, d);
fprintf(stderr, "\n ");
dump_cclp (stderr, a);
fprintf(stderr, "\n ");
dump_cclp (stderr, b);
fprintf(stderr, "\n ");
dump_cclp (stderr, d);
fprintf(stderr, "\n)\n");
}
return d;
}
/* ccl_set_diff - create a new ccl as the set difference of the two given ccls. */
int
ccl_set_diff (int a, int b)
{
int d, ch;
/* create new class */
d = cclinit();
/* In order to handle negation, we spin through all possible chars,
* addding each char in a that is not in b.
* (This could be O(n^2), but n is small and bounded.)
*/
for ( ch = 0; ch < csize; ++ch )
if (ccl_contains (a, ch) && !ccl_contains(b, ch))
ccladd (d, ch);
/* debug */
if (0){
fprintf(stderr, "ccl_set_diff (");
fprintf(stderr, "\n ");
dump_cclp (stderr, a);
fprintf(stderr, "\n ");
dump_cclp (stderr, b);
fprintf(stderr, "\n ");
dump_cclp (stderr, d);
fprintf(stderr, "\n)\n");
}
return d;
}
static void makeany()
{
static int madeany = false;
if ( ! madeany )
{
/* create the '.' character class */
checkedges(__LINE__, __FILE__);
cclinit( &anyccl );
ccladd( &anyccl, '\n' );
checkedges(__LINE__, __FILE__);
cclnegate( &anyccl );
checkedges(__LINE__, __FILE__);
madeany = true;
}
}