static int parse_class(struct peg_grammar_parser *pgp, struct peg_cursor *pc,
int *clsp)
{
struct peg_grammar *peg = pgp->peg;
struct peg_cursor npc = *pc;
char c;
int nn;
struct peg_node *cls;
uchar *cset;
if ( CHAR(pgp, &npc) != '[' && CHAR(pgp, &npc) != '.' )
return 0;
nn = peg_node_new(peg, PEG_CLASS, pc->line);
if ( nn < 0 ) {
pgp->err = PEG_ERR_NOMEM;
return -1;
}
cset = malloc(32);
if ( cset == NULL ) {
peg_node_free(peg, nn);
pgp->err = PEG_ERR_NOMEM;
return -1;
}
/* treat . as a special class that matches almost everying */
if ( CHAR(pgp, &npc) == '.' ) {
cset_fill(cset);
cset_rem(cset, '\0');
goto match;
} else {
cset_clear(cset);
npc.pos += 1;
}
while ( (c = CHAR(pgp, &npc)) != ']' && c != '\0' )
if ( class_add_char(pgp, &npc, cset) < 0 )
return -1;
if ( c == '\0' ) {
pgp->err = PEG_ERR_BAD_CLASS;
pgp->eloc = npc;
free(cset);
peg_node_free(peg, nn);
return -1;
}
match:
cls = NODE(peg, nn);
cls->pc_cset = cset;
cls->pc_cset_size = 32;
npc.pos += 1;
*pc = npc;
*clsp = nn;
skip_space(pgp, pc);
return 1;
}
void clear_bnf_index(bnf_index* bi)
{
if(!bi)return;
cset_clear((*bi).lookaheads,0);
}
