Diff: py/objslice.c

Revision:

0:5868e8752d44

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/py/objslice.c	Sat Apr 16 17:11:56 2016 +0000
@@ -0,0 +1,103 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * 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 <stdlib.h>
+#include <assert.h>
+
+#include "py/nlr.h"
+#include "py/obj.h"
+#include "py/runtime0.h"
+
+/******************************************************************************/
+/* slice object                                                               */
+
+#if MICROPY_PY_BUILTINS_SLICE
+
+// TODO: This implements only variant of slice with 2 integer args only.
+// CPython supports 3rd arg (step), plus args can be arbitrary Python objects.
+typedef struct _mp_obj_slice_t {
+    mp_obj_base_t base;
+    mp_obj_t start;
+    mp_obj_t stop;
+    mp_obj_t step;
+} mp_obj_slice_t;
+
+STATIC void slice_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
+    (void)kind;
+    mp_obj_slice_t *o = MP_OBJ_TO_PTR(o_in);
+    mp_print_str(print, "slice(");
+    mp_obj_print_helper(print, o->start, PRINT_REPR);
+    mp_print_str(print, ", ");
+    mp_obj_print_helper(print, o->stop, PRINT_REPR);
+    mp_print_str(print, ", ");
+    mp_obj_print_helper(print, o->step, PRINT_REPR);
+    mp_print_str(print, ")");
+}
+
+#if MICROPY_PY_BUILTINS_SLICE_ATTRS
+STATIC void slice_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
+    if (dest[0] != MP_OBJ_NULL) {
+        // not load attribute
+        return;
+    }
+    mp_obj_slice_t *self = MP_OBJ_TO_PTR(self_in);
+    if (attr == MP_QSTR_start) {
+        dest[0] = self->start;
+    } else if (attr == MP_QSTR_stop) {
+        dest[0] = self->stop;
+    } else if (attr == MP_QSTR_step) {
+        dest[0] = self->step;
+    }
+}
+#endif
+
+const mp_obj_type_t mp_type_slice = {
+    { &mp_type_type },
+    .name = MP_QSTR_slice,
+    .print = slice_print,
+#if MICROPY_PY_BUILTINS_SLICE_ATTRS
+    .attr = slice_attr,
+#endif
+};
+
+mp_obj_t mp_obj_new_slice(mp_obj_t ostart, mp_obj_t ostop, mp_obj_t ostep) {
+    mp_obj_slice_t *o = m_new_obj(mp_obj_slice_t);
+    o->base.type = &mp_type_slice;
+    o->start = ostart;
+    o->stop = ostop;
+    o->step = ostep;
+    return MP_OBJ_FROM_PTR(o);
+}
+
+void mp_obj_slice_get(mp_obj_t self_in, mp_obj_t *start, mp_obj_t *stop, mp_obj_t *step) {
+    assert(MP_OBJ_IS_TYPE(self_in, &mp_type_slice));
+    mp_obj_slice_t *self = MP_OBJ_TO_PTR(self_in);
+    *start = self->start;
+    *stop = self->stop;
+    *step = self->step;
+}
+
+#endif