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Code Issues 1 Releases Wiki Activity

Add alias for PEG repeat.

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A tuple where the first element is an integer is
a shortand for this.
This commit is contained in:
Calvin Rose 2020-06-11 11:23:43 -05:00
parent 6d096551f0
commit 86e12369b6
2 changed files with 14 additions and 0 deletions
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8
src/core/peg.c
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@ -1028,6 +1028,14 @@ static uint32_t peg_compile1(Builder *b, Janet peg) {
const Janet *tup = janet_unwrap_tuple(peg); const Janet *tup = janet_unwrap_tuple(peg);
int32_t len = janet_tuple_length(tup); int32_t len = janet_tuple_length(tup);
if (len == 0) peg_panic(b, "tuple in grammar must have non-zero length"); if (len == 0) peg_panic(b, "tuple in grammar must have non-zero length");
if (janet_checkint(tup[0])) {
int32_t n = janet_unwrap_integer(tup[0]);
if (n < 0) {
peg_panicf(b, "expected non-negative integer, got %d", n);
}
spec_repeat(b, len, tup);
break;
}
if (!janet_checktype(tup[0], JANET_SYMBOL)) if (!janet_checktype(tup[0], JANET_SYMBOL))
peg_panicf(b, "expected grammar command, found %v", tup[0]); peg_panicf(b, "expected grammar command, found %v", tup[0]);
const uint8_t *sym = janet_unwrap_symbol(tup[0]); const uint8_t *sym = janet_unwrap_symbol(tup[0]);

6
test/suite8.janet
View File

@ -301,4 +301,10 @@ neldb\0\0\0\xD8\x05printG\x01\0\xDE\xDE\xDE'\x03\0marshal_tes/\x02
(assert (= "abc" (0 (peg/match peg4 "(abc)"))) "peg thru/to 2") (assert (= "abc" (0 (peg/match peg4 "(abc)"))) "peg thru/to 2")
(assert (not (peg/match peg4 "123(abc")) "peg thru/to 3") (assert (not (peg/match peg4 "123(abc")) "peg thru/to 3")
(def peg5 (peg/compile [3 "abc"]))
(assert (:match peg5 "abcabcabc") "repeat alias 1")
(assert (:match peg5 "abcabcabcac") "repeat alias 2")
(assert (not (:match peg5 "abcabc")) "repeat alias 3")
(end-suite) (end-suite)