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Code Issues 1 Releases Wiki Activity

New capi janet_get_permissive

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The janet_get_permissive function implements the core semantics
of the 'get' function. The original janet_get implements the semantics of
the 'in' function and also the OP_GET opcode. This slight oddity is
to avoid a backwards incompatible change.
This commit is contained in:
Andrew Chambers 2019-12-02 15:49:51 +13:00
parent fc53445d08
commit 6233d804c8
3 changed files with 53 additions and 50 deletions
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56
src/core/corelib.c
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@ -262,59 +262,15 @@ static Janet janet_core_setdyn(int32_t argc, Janet *argv) {
return argv[1];
}
// XXX inline asm function with a new op - OP_GET_PERMISSIVE?
// This would match up with OP_GET which is used for 'in'.
static Janet janet_core_get(int32_t argc, Janet *argv) {
janet_arity(argc, 2, 3);
Janet ds = argv[0];
Janet key = argv[1];
Janet dflt = argc == 3 ? argv[2] : janet_wrap_nil();
JanetType t = janet_type(argv[0]);
switch (t) {
default:
return dflt;
case JANET_STRING:
case JANET_SYMBOL:
case JANET_KEYWORD: {
if (!janet_checkint(key)) return dflt;
int32_t index = janet_unwrap_integer(key);
if (index < 0) return dflt;
const uint8_t *str = janet_unwrap_string(ds);
if (index >= janet_string_length(str)) return dflt;
return janet_wrap_integer(str[index]);
}
case JANET_ABSTRACT: {
void *abst = janet_unwrap_abstract(ds);
JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(abst);
if (!type->get) return dflt;
return (type->get)(abst, key);
}
case JANET_ARRAY:
case JANET_TUPLE: {
if (!janet_checkint(key)) return dflt;
int32_t index = janet_unwrap_integer(key);
if (index < 0) return dflt;
if (t == JANET_ARRAY) {
JanetArray *a = janet_unwrap_array(ds);
if (index >= a->count) return dflt;
return a->data[index];
} else {
const Janet *t = janet_unwrap_tuple(ds);
if (index >= janet_tuple_length(t)) return dflt;
return t[index];
}
}
case JANET_TABLE: {
JanetTable *flag = NULL;
Janet ret = janet_table_get_ex(janet_unwrap_table(ds), key, &flag);
if (flag == NULL) return dflt;
return ret;
}
case JANET_STRUCT: {
const JanetKV *st = janet_unwrap_struct(ds);
Janet ret = janet_struct_get(st, key);
if (janet_checktype(ret, JANET_NIL)) return dflt;
return ret;
}
Janet result = janet_get_permissive(argv[0], argv[1]);
if (argc == 3 && janet_checktype(result, JANET_NIL)) {
return argv[2];
}
return result;
}
static Janet janet_core_native(int32_t argc, Janet *argv) {

46
src/core/value.c
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@ -207,6 +207,52 @@ Janet janet_get(Janet ds, Janet key) {
return value;
}
Janet janet_get_permissive(Janet ds, Janet key) {
JanetType t = janet_type(ds);
switch (t) {
default:
return janet_wrap_nil();
case JANET_STRING:
case JANET_SYMBOL:
case JANET_KEYWORD: {
if (!janet_checkint(key)) return janet_wrap_nil();
int32_t index = janet_unwrap_integer(key);
if (index < 0) return janet_wrap_nil();
const uint8_t *str = janet_unwrap_string(ds);
if (index >= janet_string_length(str)) return janet_wrap_nil();
return janet_wrap_integer(str[index]);
}
case JANET_ABSTRACT: {
void *abst = janet_unwrap_abstract(ds);
JanetAbstractType *type = (JanetAbstractType *)janet_abstract_type(abst);
if (!type->get) return janet_wrap_nil();
return (type->get)(abst, key);
}
case JANET_ARRAY:
case JANET_TUPLE: {
if (!janet_checkint(key)) return janet_wrap_nil();
int32_t index = janet_unwrap_integer(key);
if (index < 0) return janet_wrap_nil();
if (t == JANET_ARRAY) {
JanetArray *a = janet_unwrap_array(ds);
if (index >= a->count) return janet_wrap_nil();
return a->data[index];
} else {
const Janet *t = janet_unwrap_tuple(ds);
if (index >= janet_tuple_length(t)) return janet_wrap_nil();
return t[index];
}
}
case JANET_TABLE: {
return janet_table_get(janet_unwrap_table(ds), key);
}
case JANET_STRUCT: {
const JanetKV *st = janet_unwrap_struct(ds);
return janet_struct_get(st, key);
}
}
}
Janet janet_getindex(Janet ds, int32_t index) {
Janet value;
if (index < 0) janet_panic("expected non-negative index");

1
src/include/janet.h
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@ -1285,6 +1285,7 @@ JANET_API int32_t janet_hash(Janet x);
JANET_API int janet_compare(Janet x, Janet y);
JANET_API int janet_cstrcmp(const uint8_t *str, const char *other);
JANET_API Janet janet_get(Janet ds, Janet key);
JANET_API Janet janet_get_permissive(Janet ds, Janet key);
JANET_API Janet janet_getindex(Janet ds, int32_t index);
JANET_API int32_t janet_length(Janet x);
JANET_API Janet janet_lengthv(Janet x);