From e7a213a11420ed362dfb672cd0fa6e77c032fa07 Mon Sep 17 00:00:00 2001
From: Jeff Epler <jepler@gmail.com>
Date: Wed, 16 Sep 2020 11:57:09 -0500
Subject: py: Add enum helper code

This makes it much easier to implement enums, and the printing code is
shared.  We might want to convert other enums to this in the future.
---
 py/enum.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 py/enum.c

(limited to 'py/enum.c')

diff --git a/py/enum.c b/py/enum.c
new file mode 100644
index 000000000..02a85a168
--- /dev/null
+++ b/py/enum.c
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2020 Jeff Epler for Adafruit Industries
+ *
+ * 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/enum.h"
+#include "py/runtime.h"
+
+mp_obj_t cp_enum_find(const mp_obj_type_t *type, int value) {
+    const mp_obj_dict_t *dict = type->locals_dict;
+    for (size_t i=0; i<dict->map.used; i++) {
+        const cp_enum_obj_t *v = dict->map.table[i].value;
+        if (v->value == value) {
+            return (mp_obj_t)v;
+        }
+    }
+    return mp_const_none;
+}
+
+int cp_enum_value(const mp_obj_type_t *type, mp_obj_t *obj) {
+    if (!MP_OBJ_IS_TYPE(obj, type)) {
+        mp_raise_TypeError_varg(translate("Expected a %q"), type->name);
+    }
+    return ((cp_enum_obj_t*)MP_OBJ_TO_PTR(obj))->value;
+}
+
+void cp_enum_obj_print_helper(uint16_t module, const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    (void) kind;
+    cp_enum_obj_t *self = self_in;
+    mp_printf(print, "%q.%q.%q", module, self->base.type->name, self->name);
+}
-- 
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