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Code Issues 1 Releases Wiki Activity

Abstract type getters can indicate key absence.

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This change to the c api allows abstract types to indicate
to the runtime if a key was absent, or if it meant to return nil.
This commit is contained in:
Andrew Chambers
2019-12-09 16:50:33 +13:00
parent 4c5734c2ee
commit 57ccfb692c
8 changed files with 54 additions and 43 deletions
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3
src/core/vm.c
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@@ -1200,9 +1200,8 @@ Janet janet_mcall(const char *name, int32_t argc, Janet *argv) {
if (janet_checktype(argv[0], JANET_ABSTRACT)) {
void *abst = janet_unwrap_abstract(argv[0]);
JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(abst);
if (!type->get)
if (!type->get || !(type->get)(abst, janet_ckeywordv(name), &method))
janet_panicf("abstract value %v does not implement :%s", argv[0], name);
method = (type->get)(abst, janet_ckeywordv(name));
} else if (janet_checktype(argv[0], JANET_TABLE)) {
JanetTable *table = janet_unwrap_table(argv[0]);
method = janet_table_get(table, janet_ckeywordv(name));