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Merge pull request #238 from pfalcon/bool_len 

Implement __bool__ and __len__ via unary_op virtual method for all types.
This commit is contained in:
Damien George 2014-01-30 01:29:32 -08:00
parent cdd2c62e07 c1d9bbc345
commit b25711ea8f
13 changed files with 52 additions and 16 deletions
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10
py/obj.c
View File

@ -251,9 +251,15 @@ mp_obj_t mp_obj_len_maybe(mp_obj_t o_in) {
len = seq_len;
} else if (MP_OBJ_IS_TYPE(o_in, &dict_type)) {
len = mp_obj_dict_len(o_in);
} else if (MP_OBJ_IS_TYPE(o_in, &array_type)) {
len = mp_obj_array_len(o_in);
} else {
mp_obj_type_t *type = mp_obj_get_type(o_in);
if (type->unary_op != NULL) {
mp_obj_t result = type->unary_op(RT_UNARY_OP_LEN, o_in);
if (result != MP_OBJ_NULL) {
return result;
}
}
return MP_OBJ_NULL;
}
return MP_OBJ_NEW_SMALL_INT(len);

10
py/objarray.c
View File

@ -189,6 +189,15 @@ static mp_obj_t mp_builtin_bytearray(mp_obj_t arg) {
}
MP_DEFINE_CONST_FUN_OBJ_1(mp_builtin_bytearray_obj, mp_builtin_bytearray);
static mp_obj_t array_unary_op(int op, mp_obj_t o_in) {
mp_obj_array_t *o = o_in;
switch (op) {
case RT_UNARY_OP_BOOL: return MP_BOOL(o->len != 0);
case RT_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(o->len);
default: return MP_OBJ_NULL; // op not supported
}
}
static mp_obj_t array_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
mp_obj_array_t *o = lhs;
switch (op) {
@ -245,6 +254,7 @@ const mp_obj_type_t array_type = {
.print = array_print,
.make_new = array_make_new,
.getiter = array_iterator_new,
.unary_op = array_unary_op,
.binary_op = array_binary_op,
.store_item = array_store_item,
.methods = array_type_methods,

2
py/objbool.c
View File

@ -36,7 +36,7 @@ static mp_obj_t bool_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp
static mp_obj_t bool_unary_op(int op, mp_obj_t o_in) {
machine_int_t value = ((mp_obj_bool_t*)o_in)->value;
switch (op) {
case RT_UNARY_OP_NOT: if (value) { return mp_const_false; } else { return mp_const_true; }
case RT_UNARY_OP_BOOL: return o_in;
case RT_UNARY_OP_POSITIVE: return MP_OBJ_NEW_SMALL_INT(value);
case RT_UNARY_OP_NEGATIVE: return MP_OBJ_NEW_SMALL_INT(-value);
case RT_UNARY_OP_INVERT:

2
py/objcomplex.c
View File

@ -73,7 +73,7 @@ static mp_obj_t complex_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const
static mp_obj_t complex_unary_op(int op, mp_obj_t o_in) {
mp_obj_complex_t *o = o_in;
switch (op) {
case RT_UNARY_OP_NOT: if (o->real != 0 || o->imag != 0) { return mp_const_true;} else { return mp_const_false; }
case RT_UNARY_OP_BOOL: return MP_BOOL(o->real != 0 || o->imag != 0);
case RT_UNARY_OP_POSITIVE: return o_in;
case RT_UNARY_OP_NEGATIVE: return mp_obj_new_complex(-o->real, -o->imag);
default: return MP_OBJ_NULL; // op not supported

3
py/objdict.c
View File

@ -46,7 +46,8 @@ static mp_obj_t dict_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp
static mp_obj_t dict_unary_op(int op, mp_obj_t self_in) {
mp_obj_dict_t *self = self_in;
switch (op) {
case RT_UNARY_OP_NOT: if (self->map.used == 0) { return mp_const_true; } else { return mp_const_false; }
case RT_UNARY_OP_BOOL: return MP_BOOL(self->map.used != 0);
case RT_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->map.used);
default: return MP_OBJ_NULL; // op not supported for None
}
}

2
py/objfloat.c
View File

@ -47,7 +47,7 @@ static mp_obj_t float_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const m
static mp_obj_t float_unary_op(int op, mp_obj_t o_in) {
mp_obj_float_t *o = o_in;
switch (op) {
case RT_UNARY_OP_NOT: if (o->value != 0) { return mp_const_true;} else { return mp_const_false; }
case RT_UNARY_OP_BOOL: return MP_BOOL(o->value != 0);
case RT_UNARY_OP_POSITIVE: return o_in;
case RT_UNARY_OP_NEGATIVE: return mp_obj_new_float(-o->value);
default: return NULL; // op not supported

2
py/objint_longlong.c
View File

@ -35,7 +35,7 @@ void int_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj
mp_obj_t int_unary_op(int op, mp_obj_t o_in) {
mp_obj_int_t *o = o_in;
switch (op) {
case RT_UNARY_OP_NOT: return MP_BOOL(o->val != 0); // TODO: implements RT_UNARY_OP_BOOL
case RT_UNARY_OP_BOOL: return MP_BOOL(o->val != 0);
case RT_UNARY_OP_POSITIVE: return o_in;
case RT_UNARY_OP_NEGATIVE: return mp_obj_new_int_from_ll(-o->val);
case RT_UNARY_OP_INVERT: return mp_obj_new_int_from_ll(~o->val);

3
py/objlist.c
View File

@ -125,7 +125,8 @@ static bool list_cmp_helper(int op, mp_obj_t self_in, mp_obj_t another_in) {
static mp_obj_t list_unary_op(int op, mp_obj_t self_in) {
mp_obj_list_t *self = self_in;
switch (op) {
case RT_UNARY_OP_NOT: if (self->len == 0) { return mp_const_true; } else { return mp_const_false; }
case RT_UNARY_OP_BOOL: return MP_BOOL(self->len != 0);
case RT_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
default: return MP_OBJ_NULL; // op not supported for None
}
}

2
py/objnone.c
View File

@ -18,7 +18,7 @@ static void none_print(void (*print)(void *env, const char *fmt, ...), void *env
static mp_obj_t none_unary_op(int op, mp_obj_t o_in) {
switch (op) {
case RT_UNARY_OP_NOT: return mp_const_true;
case RT_UNARY_OP_BOOL: return mp_const_false;
default: return MP_OBJ_NULL; // op not supported for None
}
}

3
py/objtuple.c
View File

@ -76,7 +76,8 @@ static mp_obj_t tuple_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const m
static mp_obj_t tuple_unary_op(int op, mp_obj_t self_in) {
mp_obj_tuple_t *self = self_in;
switch (op) {
case RT_UNARY_OP_NOT: if (self->len == 0) { return mp_const_true; } else { return mp_const_false; }
case RT_UNARY_OP_BOOL: return MP_BOOL(self->len != 0);
case RT_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(self->len);
default: return MP_OBJ_NULL; // op not supported for None
}
}

15
py/runtime.c
View File

@ -317,15 +317,20 @@ int rt_is_true(mp_obj_t arg) {
} else if (arg == mp_const_true) {
return 1;
} else {
mp_obj_type_t *type = mp_obj_get_type(arg);
if (type->unary_op != NULL) {
mp_obj_t result = type->unary_op(RT_UNARY_OP_BOOL, arg);
if (result != NULL) {
return result == mp_const_true;
}
}
mp_obj_t len = mp_obj_len_maybe(arg);
if (len != MP_OBJ_NULL) {
// obj has a length, truth determined if len != 0
return len != MP_OBJ_NEW_SMALL_INT(0);
} else {
// TODO check for __bool__ method
// TODO check floats and complex numbers
// any other obj is true (TODO is that correct?)
// any other obj is true per Python semantics
return 1;
}
}
@ -476,7 +481,7 @@ mp_obj_t rt_unary_op(int op, mp_obj_t arg) {
if (MP_OBJ_IS_SMALL_INT(arg)) {
mp_small_int_t val = MP_OBJ_SMALL_INT_VALUE(arg);
switch (op) {
case RT_UNARY_OP_NOT: if (val == 0) { return mp_const_true;} else { return mp_const_false; }
case RT_UNARY_OP_BOOL: return MP_BOOL(val != 0);
case RT_UNARY_OP_POSITIVE: break;
case RT_UNARY_OP_NEGATIVE: val = -val; break;
case RT_UNARY_OP_INVERT: val = ~val; break;

5
py/runtime0.h
View File

@ -1,8 +1,11 @@
typedef enum {
RT_UNARY_OP_NOT, // TODO remove this op since it's no longer needed
RT_UNARY_OP_BOOL, // __bool__
RT_UNARY_OP_LEN, // __len__
RT_UNARY_OP_POSITIVE,
RT_UNARY_OP_NEGATIVE,
RT_UNARY_OP_INVERT,
// Used only for CPython-compatible codegeneration
RT_UNARY_OP_NOT,
} rt_unary_op_t;
typedef enum {

9
tests/basics/true-value.py
View File

@ -3,9 +3,18 @@
if not False:
print("False")
if not None:
print("None")
if not 0:
print("0")
if not 0.0:
print("float 0")
if not 0+0j:
print("complex 0")
if not "":
print("Empty string")
if "foo":