add circuitpython code

1 files changed, 75 insertions, 0 deletions

diff --git a/circuitpython/py/objfilter.c b/circuitpython/py/objfilter.c
new file mode 100644
index 0000000..c034df2
--- /dev/null
+++ b/circuitpython/py/objfilter.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/runtime.h"
+
+#if MICROPY_PY_BUILTINS_FILTER
+
+typedef struct _mp_obj_filter_t {
+    mp_obj_base_t base;
+    mp_obj_t fun;
+    mp_obj_t iter;
+} mp_obj_filter_t;
+
+STATIC mp_obj_t filter_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    mp_arg_check_num(n_args, n_kw, 2, 2, false);
+    mp_obj_filter_t *o = m_new_obj(mp_obj_filter_t);
+    o->base.type = type;
+    o->fun = args[0];
+    o->iter = mp_getiter(args[1], NULL);
+    return MP_OBJ_FROM_PTR(o);
+}
+
+STATIC mp_obj_t filter_iternext(mp_obj_t self_in) {
+    mp_check_self(mp_obj_is_type(self_in, &mp_type_filter));
+    mp_obj_filter_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_obj_t next;
+    while ((next = mp_iternext(self->iter)) != MP_OBJ_STOP_ITERATION) {
+        mp_obj_t val;
+        if (self->fun != mp_const_none) {
+            val = mp_call_function_n_kw(self->fun, 1, 0, &next);
+        } else {
+            val = next;
+        }
+        if (mp_obj_is_true(val)) {
+            return next;
+        }
+    }
+    return MP_OBJ_STOP_ITERATION;
+}
+
+const mp_obj_type_t mp_type_filter = {
+    { &mp_type_type },
+    .flags = MP_TYPE_FLAG_EXTENDED,
+    .name = MP_QSTR_filter,
+    .make_new = filter_make_new,
+    MP_TYPE_EXTENDED_FIELDS(
+        .getiter = mp_identity_getiter,
+        .iternext = filter_iternext,
+        ),
+};
+
+#endif // MICROPY_PY_BUILTINS_FILTER