added enumerate()

py/mpqstrraw.h

@@ -41,6 +41,7 @@ Q(chr)
 Q(complex)
 Q(dict)
 Q(divmod)
+Q(enumerate)
 Q(float)
 Q(hash)
 Q(int)

py/obj.h

@@ -294,6 +294,9 @@ void mp_obj_list_get(mp_obj_t self_in, uint *len, mp_obj_t **items);
 void mp_obj_list_store(mp_obj_t self_in, mp_obj_t index, mp_obj_t value);
 mp_obj_t list_sort(mp_obj_t args, struct _mp_map_t *kwargs);
 
+// enumerate
+extern const mp_obj_type_t enumerate_type;
+
 // dict
 extern const mp_obj_type_t dict_type;
 uint mp_obj_dict_len(mp_obj_t self_in);

py/objenumerate.c

@@ -0,0 +1,53 @@
+#include <stdlib.h>
+#include <assert.h>
+
+#include "misc.h"
+#include "mpconfig.h"
+#include "obj.h"
+#include "runtime.h"
+
+typedef struct _mp_obj_enumerate_t {
+    mp_obj_base_t base;
+    mp_obj_t iter;
+    machine_int_t cur;
+} mp_obj_enumerate_t;
+
+static mp_obj_t enumerate_getiter(mp_obj_t self_in) {
+    return self_in;
+}
+
+static mp_obj_t enumerate_iternext(mp_obj_t self_in);
+
+/* TODO: enumerate is one of the ones that can take args or kwargs.
+   Sticking to args for now */
+static mp_obj_t enumerate_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *args) {
+    /* NOTE: args are backwards */
+    assert(n_args > 0);
+    args += n_args - 1;
+    mp_obj_enumerate_t *o = m_new_obj(mp_obj_enumerate_t);
+    o->base.type = &enumerate_type;
+    o->iter = rt_getiter(args[0]);
+    o->cur = n_args > 1 ? mp_obj_get_int(args[-1]) : 0;
+
+    return o;
+}
+
+const mp_obj_type_t enumerate_type = {
+    { &mp_const_type },
+    "enumerate",
+    .make_new = enumerate_make_new,
+    .iternext = enumerate_iternext,
+    .getiter = enumerate_getiter,
+};
+
+static mp_obj_t enumerate_iternext(mp_obj_t self_in) {
+    assert(MP_OBJ_IS_TYPE(self_in, &enumerate_type));
+    mp_obj_enumerate_t *self = self_in;
+    mp_obj_t next = rt_iternext(self->iter);
+    if (next == mp_const_stop_iteration) {
+        return mp_const_stop_iteration;
+    } else {
+        mp_obj_t items[] = {MP_OBJ_NEW_SMALL_INT(self->cur++), next};
+        return mp_obj_new_tuple(2, items);
+    }
+}

py/py.mk

@@ -77,6 +77,7 @@ PY_O_BASENAME = \
 	objclosure.o \
 	objcomplex.o \
 	objdict.o \
+	objenumerate.o \
 	objexcept.o \
 	objfloat.o \
 	objfun.o \

py/runtime.c

@@ -105,6 +105,7 @@ void rt_init(void) {
     mp_map_add_qstr(&map_builtins, MP_QSTR_complex, (mp_obj_t)&complex_type);
 #endif
     mp_map_add_qstr(&map_builtins, MP_QSTR_dict, (mp_obj_t)&dict_type);
+    mp_map_add_qstr(&map_builtins, MP_QSTR_enumerate, (mp_obj_t)&enumerate_type);
 #if MICROPY_ENABLE_FLOAT
     mp_map_add_qstr(&map_builtins, MP_QSTR_float, (mp_obj_t)&float_type);
 #endif

tests/basics/tests/enumerate.py

@@ -0,0 +1,6 @@
+print(list(enumerate([])))
+print(list(enumerate([1, 2, 3])))
+print(list(enumerate([1, 2, 3], 5)))
+print(list(enumerate([1, 2, 3], -5)))
+print(list(enumerate(range(10000))))
+