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bugfix in the C runtime that shows up with only some grammars

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kr.angelov
2014-04-08 12:41:41 +00:00
parent 581a0336a5
commit 52377b46cf
1 changed files with 2 additions and 1 deletions
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3
src/runtime/c/pgf/parser.c
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@@ -1148,7 +1148,8 @@ pgf_parsing_lookahead(PgfParsing *ps, PgfParseState* state)
{
PgfSequence* epsilon_seq =
gu_seq_index(ps->concr->sequences, PgfSequence, 0);
if (gu_seq_length(epsilon_seq->syms) == 0) {
if (gu_seq_length(epsilon_seq->syms) == 0 &&
epsilon_seq->idx != NULL) {
// Since the sequences are sorted, the epsilon sequence will
// always be the first if there is any at all. We should
// always add the epsilon in the index, because we do