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add LR(0) output

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This should not be used to generate parsers.  My point is actually to
facilitate debugging (when tweaking the generation of the LR(0)
automaton for instance, not carying -yet- about lookaheads).

* src/reader.c (prepare_percent_define_front_end_variables): Add lr(0).
* src/conflicts.c (set_conflicts): Be robust to reds not having
lookaheads at all.
* src/ielr.c (LrType, lr_type_get): Adjust.
(ielr): Implement support for LR(0).
* src/lalr.c (lalr_free): Don't free LA when it's not computed.
This commit is contained in:
Akim Demaille
2019-01-27 18:29:17 +01:00
parent 0d44f83fcc
commit e346210c03
3 changed files with 68 additions and 42 deletions
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17
src/conflicts.c
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@@ -369,13 +369,16 @@ set_conflicts (state *s, symbol **errors)
s->solved_conflicts_xml = obstack_finish0 (&solved_conflicts_xml_obstack);
/* Loop over all rules which require lookahead in this state. Check
for conflicts not resolved above. */
for (int i = 0; i < reds->num; ++i)
{
if (!bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
conflicts[s->number] = 1;
bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]);
}
for conflicts not resolved above.
reds->lookahead_tokens can be NULL if the LR type is LR(0). */
if (reds->lookahead_tokens)
for (int i = 0; i < reds->num; ++i)
{
if (!bitset_disjoint_p (reds->lookahead_tokens[i], lookahead_set))
conflicts[s->number] = 1;
bitset_or (lookahead_set, lookahead_set, reds->lookahead_tokens[i]);
}
}