Commit cb9dc086 authored by Paul Sokolovsky's avatar Paul Sokolovsky
Browse files

modio: Implement io.StringIO class.

parent dbc81df5
......@@ -11,6 +11,8 @@ STATIC const mp_map_elem_t mp_module_io_globals_table[] = {
// Note: mp_builtin_open_obj should be defined by port, it's not
// part of the core.
{ MP_OBJ_NEW_QSTR(MP_QSTR_open), (mp_obj_t)&mp_builtin_open_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_BytesIO), (mp_obj_t)&mp_type_stringio },
{ MP_OBJ_NEW_QSTR(MP_QSTR_StringIO), (mp_obj_t)&mp_type_stringio },
};
STATIC const mp_obj_dict_t mp_module_io_globals = {
......
......@@ -292,6 +292,7 @@ extern const mp_obj_type_t mp_type_module;
extern const mp_obj_type_t mp_type_staticmethod;
extern const mp_obj_type_t mp_type_classmethod;
extern const mp_obj_type_t mp_type_property;
extern const mp_obj_type_t mp_type_stringio;
// Exceptions
extern const mp_obj_type_t mp_type_BaseException;
......
#include <stdio.h>
#include <string.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
#include "runtime.h"
#include "stream.h"
typedef struct _mp_obj_stringio_t {
mp_obj_base_t base;
vstr_t *vstr;
// StringIO has single pointer used for both reading and writing
machine_uint_t pos;
} mp_obj_stringio_t;
STATIC void stringio_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
mp_obj_stringio_t *self = self_in;
print(env, "<io.StringIO 0x%x>", self->vstr);
}
STATIC machine_int_t stringio_read(mp_obj_t o_in, void *buf, machine_uint_t size, int *errcode) {
mp_obj_stringio_t *o = o_in;
machine_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 machine_int_t stringio_write(mp_obj_t o_in, const void *buf, machine_uint_t size, int *errcode) {
mp_obj_stringio_t *o = o_in;
machine_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;
}
STATIC mp_obj_t stringio_getvalue(mp_obj_t self_in) {
mp_obj_stringio_t *self = self_in;
return mp_obj_new_str((byte*)self->vstr->buf, self->vstr->len, false);
}
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 = self_in;
vstr_free(self->vstr);
self->vstr = NULL;
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_close_obj, stringio_close);
mp_obj_t stringio___exit__(uint n_args, const mp_obj_t *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() {
mp_obj_stringio_t *o = m_new_obj(mp_obj_stringio_t);
o->base.type = &mp_type_stringio;
o->vstr = vstr_new();
o->pos = 0;
return o;
}
STATIC mp_obj_t stringio_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
mp_obj_stringio_t *o = stringio_new();
if (n_args > 0) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
stringio_write(o, bufinfo.buf, bufinfo.len, NULL);
// Cur ptr is always at the beginning of buffer at the construction
o->pos = 0;
}
return o;
}
STATIC const mp_map_elem_t stringio_locals_dict_table[] = {
{ MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&mp_stream_read_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readall), (mp_obj_t)&mp_stream_readall_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_readline), (mp_obj_t)&mp_stream_unbuffered_readline_obj},
{ MP_OBJ_NEW_QSTR(MP_QSTR_write), (mp_obj_t)&mp_stream_write_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_close), (mp_obj_t)&stringio_close_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR_getvalue), (mp_obj_t)&stringio_getvalue_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___enter__), (mp_obj_t)&mp_identity_obj },
{ MP_OBJ_NEW_QSTR(MP_QSTR___exit__), (mp_obj_t)&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,
};
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_t)&stringio_locals_dict,
};
......@@ -74,6 +74,7 @@ PY_O_BASENAME = \
objset.o \
objslice.o \
objstr.o \
objstringio.o \
objtuple.o \
objtype.o \
objzip.o \
......
......@@ -118,7 +118,6 @@ Q(hash)
Q(hex)
Q(%#x)
Q(id)
Q(io)
Q(int)
Q(isinstance)
Q(issubclass)
......@@ -308,6 +307,13 @@ Q(pack)
Q(unpack)
#endif
#if MICROPY_ENABLE_MOD_IO
Q(io)
Q(StringIO)
Q(BytesIO)
Q(getvalue)
#endif
#if MICROPY_ENABLE_PROPERTY
Q(property)
Q(getter)
......
import io
a = io.StringIO()
print(a.getvalue())
print(a.read())
a = io.StringIO("foobar")
print(a.getvalue())
print(a.read())
print(a.read())
a = io.StringIO()
a.write("foo")
print(a.getvalue())
a = io.StringIO("foo")
a.write("12")
print(a.getvalue())
a = io.StringIO("foo")
a.write("123")
print(a.getvalue())
a = io.StringIO("foo")
a.write("1234")
print(a.getvalue())
a = io.StringIO()
a.write("foo")
print(a.read())
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