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-rw-r--r--py/argcheck.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/py/argcheck.c b/py/argcheck.c
new file mode 100644
index 0000000000..5c5ea1bf80
--- /dev/null
+++ b/py/argcheck.c
@@ -0,0 +1,78 @@
+#include <stdlib.h>
+#include <assert.h>
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "runtime.h"
+
+void mp_arg_check_num(uint n_args, uint n_kw, uint n_args_min, uint n_args_max, bool takes_kw) {
+ // TODO maybe take the function name as an argument so we can print nicer error messages
+
+ if (n_kw && !takes_kw) {
+ nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "function does not take keyword arguments"));
+ }
+
+ if (n_args_min == n_args_max) {
+ if (n_args != n_args_min) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
+ "function takes %d positional arguments but %d were given",
+ n_args_min, n_args));
+ }
+ } else {
+ if (n_args < n_args_min) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
+ "function missing %d required positional arguments",
+ n_args_min - n_args));
+ } else if (n_args > n_args_max) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError,
+ "function expected at most %d arguments, got %d",
+ n_args_max, n_args));
+ }
+ }
+}
+
+void mp_arg_parse_all(uint n_pos, const mp_obj_t *pos, mp_map_t *kws, uint n_allowed, const mp_arg_parse_t *allowed, mp_arg_parse_val_t *out_vals) {
+ uint pos_found = 0, kws_found = 0;
+ for (uint i = 0; i < n_allowed; i++) {
+ mp_obj_t given_arg;
+ if (i < n_pos) {
+ if (allowed[i].flags & MP_ARG_PARSE_KW_ONLY) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "'%s' argument must be given by a keyword", qstr_str(allowed[i].qstr)));
+ }
+ pos_found++;
+ given_arg = pos[i];
+ } else {
+ mp_map_elem_t *kw = mp_map_lookup(kws, MP_OBJ_NEW_QSTR(allowed[i].qstr), MP_MAP_LOOKUP);
+ if (kw == NULL) {
+ if (allowed[i].flags & MP_ARG_PARSE_REQUIRED) {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "'%s' argument required", qstr_str(allowed[i].qstr)));
+ }
+ out_vals[i] = allowed[i].defval;
+ continue;
+ } else {
+ kws_found++;
+ given_arg = kw->value;
+ }
+ }
+ if ((allowed[i].flags & MP_ARG_PARSE_KIND_MASK) == MP_ARG_PARSE_BOOL) {
+ out_vals[i].u_bool = mp_obj_is_true(given_arg);
+ } else if ((allowed[i].flags & MP_ARG_PARSE_KIND_MASK) == MP_ARG_PARSE_INT) {
+ out_vals[i].u_int = mp_obj_get_int(given_arg);
+ } else if ((allowed[i].flags & MP_ARG_PARSE_KIND_MASK) == MP_ARG_PARSE_OBJ) {
+ out_vals[i].u_obj = given_arg;
+ } else {
+ assert(0);
+ }
+ }
+ if (pos_found < n_pos) {
+ // TODO better error message
+ nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "extra positional arguments given"));
+ }
+ if (kws_found < kws->used) {
+ // TODO better error message
+ nlr_raise(mp_obj_new_exception_msg(&mp_type_TypeError, "extra keyword arguments given"));
+ }
+}