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Code Issues 1 Releases Wiki Activity

Address #300

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Check for empty capture stack in replace rule.
This commit is contained in:
Calvin Rose 2020-03-06 10:01:04 -06:00
parent f9e9c70b6c
commit 714bd61d56
2 changed files with 14 additions and 5 deletions
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14
src/core/peg.c
View File

@ -369,19 +369,23 @@ tail:
s->mode = oldmode;
if (!result) return NULL;
Janet cap;
Janet cap = janet_wrap_nil();
Janet constant = s->constants[rule[2]];
switch (janet_type(constant)) {
default:
cap = constant;
break;
case JANET_STRUCT:
cap = janet_struct_get(janet_unwrap_struct(constant),
s->captures->data[s->captures->count - 1]);
if (s->captures->count) {
cap = janet_struct_get(janet_unwrap_struct(constant),
s->captures->data[s->captures->count - 1]);
}
break;
case JANET_TABLE:
cap = janet_table_get(janet_unwrap_table(constant),
s->captures->data[s->captures->count - 1]);
if (s->captures->count) {
cap = janet_table_get(janet_unwrap_table(constant),
s->captures->data[s->captures->count - 1]);
}
break;
case JANET_CFUNCTION:
cap = janet_unwrap_cfunction(constant)(s->captures->count - cs.cap,

5
test/suite8.janet
View File

@ -112,4 +112,9 @@
(assert (= false (and false false)) "and 1")
(assert (= false (or false false)) "or 1")
# #300 Regression test
# Just don't segfault
(assert (peg/match '{:main (replace "S" {"S" :spade})} "S7") "regression #300")
(end-suite)