Diff: py/objstringio.c

Revision:

0:5868e8752d44

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/py/objstringio.c	Sat Apr 16 17:11:56 2016 +0000
@@ -0,0 +1,193 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ * Copyright (c) 2014 Paul Sokolovsky
+ *
+ * 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 <stdio.h>
+#include <string.h>
+
+#include "py/nlr.h"
+#include "py/objstr.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+
+#if MICROPY_PY_IO
+
+typedef struct _mp_obj_stringio_t {
+    mp_obj_base_t base;
+    vstr_t *vstr;
+    // StringIO has single pointer used for both reading and writing
+    mp_uint_t pos;
+} mp_obj_stringio_t;
+
+#if MICROPY_CPYTHON_COMPAT
+STATIC void check_stringio_is_open(const mp_obj_stringio_t *o) {
+    if (o->vstr == NULL) {
+        nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "I/O operation on closed file"));
+    }
+}
+#else
+#define check_stringio_is_open(o)
+#endif
+
+STATIC void stringio_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    (void)kind;
+    mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_printf(print, self->base.type == &mp_type_stringio ? "<io.StringIO 0x%x>" : "<io.BytesIO 0x%x>", self);
+}
+
+STATIC mp_uint_t stringio_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
+    (void)errcode;
+    mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
+    check_stringio_is_open(o);
+    mp_uint_t remaining = o->vstr->len - o->pos;
+    if (size > remaining) {
+        size = remaining;
+    }
+    memcpy(buf, o->vstr->buf + o->pos, size);
+    o->pos += size;
+    return size;
+}
+
+STATIC mp_uint_t stringio_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
+    (void)errcode;
+    mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
+    check_stringio_is_open(o);
+    mp_uint_t remaining = o->vstr->alloc - o->pos;
+    if (size > remaining) {
+        // Take all what's already allocated...
+        o->vstr->len = o->vstr->alloc;
+        // ... and add more
+        vstr_add_len(o->vstr, size - remaining);
+    }
+    memcpy(o->vstr->buf + o->pos, buf, size);
+    o->pos += size;
+    if (o->pos > o->vstr->len) {
+        o->vstr->len = o->pos;
+    }
+    return size;
+}
+
+#define STREAM_TO_CONTENT_TYPE(o) (((o)->base.type == &mp_type_stringio) ? &mp_type_str : &mp_type_bytes)
+
+STATIC mp_obj_t stringio_getvalue(mp_obj_t self_in) {
+    mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
+    check_stringio_is_open(self);
+    return mp_obj_new_str_of_type(STREAM_TO_CONTENT_TYPE(self), (byte*)self->vstr->buf, self->vstr->len);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_getvalue_obj, stringio_getvalue);
+
+STATIC mp_obj_t stringio_close(mp_obj_t self_in) {
+    mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
+#if MICROPY_CPYTHON_COMPAT
+    vstr_free(self->vstr);
+    self->vstr = NULL;
+#else
+    vstr_clear(self->vstr);
+    self->vstr->alloc = 0;
+    self->vstr->len = 0;
+    self->pos = 0;
+#endif
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_close_obj, stringio_close);
+
+STATIC mp_obj_t stringio___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    return stringio_close(args[0]);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(stringio___exit___obj, 4, 4, stringio___exit__);
+
+STATIC mp_obj_stringio_t *stringio_new(const mp_obj_type_t *type) {
+    mp_obj_stringio_t *o = m_new_obj(mp_obj_stringio_t);
+    o->base.type = type;
+    o->vstr = vstr_new();
+    o->pos = 0;
+    return o;
+}
+
+STATIC mp_obj_t stringio_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    (void)n_kw; // TODO check n_kw==0
+    mp_obj_stringio_t *o = stringio_new(type_in);
+
+    if (n_args > 0) {
+        mp_buffer_info_t bufinfo;
+        mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
+        stringio_write(MP_OBJ_FROM_PTR(o), bufinfo.buf, bufinfo.len, NULL);
+        // Cur ptr is always at the beginning of buffer at the construction
+        o->pos = 0;
+    }
+    return MP_OBJ_FROM_PTR(o);
+}
+
+STATIC const mp_rom_map_elem_t stringio_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
+    { MP_ROM_QSTR(MP_QSTR_readall), MP_ROM_PTR(&mp_stream_readall_obj) },
+    { MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
+    { MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
+    { MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&stringio_close_obj) },
+    { MP_ROM_QSTR(MP_QSTR_getvalue), MP_ROM_PTR(&stringio_getvalue_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&stringio___exit___obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(stringio_locals_dict, stringio_locals_dict_table);
+
+STATIC const mp_stream_p_t stringio_stream_p = {
+    .read = stringio_read,
+    .write = stringio_write,
+    .is_text = true,
+};
+
+STATIC const mp_stream_p_t bytesio_stream_p = {
+    .read = stringio_read,
+    .write = stringio_write,
+};
+
+const mp_obj_type_t mp_type_stringio = {
+    { &mp_type_type },
+    .name = MP_QSTR_StringIO,
+    .print = stringio_print,
+    .make_new = stringio_make_new,
+    .getiter = mp_identity,
+    .iternext = mp_stream_unbuffered_iter,
+    .stream_p = &stringio_stream_p,
+    .locals_dict = (mp_obj_dict_t*)&stringio_locals_dict,
+};
+
+#if MICROPY_PY_IO_BYTESIO
+const mp_obj_type_t mp_type_bytesio = {
+    { &mp_type_type },
+    .name = MP_QSTR_BytesIO,
+    .print = stringio_print,
+    .make_new = stringio_make_new,
+    .getiter = mp_identity,
+    .iternext = mp_stream_unbuffered_iter,
+    .stream_p = &bytesio_stream_p,
+    .locals_dict = (mp_obj_dict_t*)&stringio_locals_dict,
+};
+#endif
+
+#endif