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Implement str.count and add tests for it. 

Also modify mp_get_index to accept:
1. Indices that are or evaluate to a boolean.
2. Slice indices.
Add tests for these two cases.
This commit is contained in:
xbe 2014-03-12 22:57:16 -07:00
parent 19438fd30a
commit 9e1e8cd642
10 changed files with 119 additions and 22 deletions
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32
py/obj.c
View File

@ -218,20 +218,32 @@ mp_obj_t *mp_obj_get_array_fixed_n(mp_obj_t o_in, machine_int_t n) {
}
}
uint mp_get_index(const mp_obj_type_t *type, machine_uint_t len, mp_obj_t index) {
// TODO False and True are considered 0 and 1 for indexing purposes
// is_slice determines whether the index is a slice index
uint mp_get_index(const mp_obj_type_t *type, machine_uint_t len, mp_obj_t index, bool is_slice) {
int i;
if (MP_OBJ_IS_SMALL_INT(index)) {
int i = MP_OBJ_SMALL_INT_VALUE(index);
if (i < 0) {
i += len;
}
if (i < 0 || i >= len) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_IndexError, "%s index out of range", qstr_str(type->name)));
}
return i;
i = MP_OBJ_SMALL_INT_VALUE(index);
} else if (MP_OBJ_IS_TYPE(index, &bool_type)) {
i = index == mp_const_true ? 1 : 0;
} else {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "%s indices must be integers, not %s", qstr_str(type->name), mp_obj_get_type_str(index)));
}
if (i < 0) {
i += len;
}
if (is_slice) {
if (i < 0) {
i = 0;
} else if (i > len) {
i = len;
}
} else {
if (i < 0 || i >= len) {
nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_IndexError, "%s index out of range", qstr_str(type->name)));
}
}
return i;
}
// may return MP_OBJ_NULL

2
py/obj.h
View File

@ -267,7 +267,7 @@ void mp_obj_get_complex(mp_obj_t self_in, mp_float_t *real, mp_float_t *imag);
#endif
//qstr mp_obj_get_qstr(mp_obj_t arg);
mp_obj_t *mp_obj_get_array_fixed_n(mp_obj_t o, machine_int_t n);
uint mp_get_index(const mp_obj_type_t *type, machine_uint_t len, mp_obj_t index);
uint mp_get_index(const mp_obj_type_t *type, machine_uint_t len, mp_obj_t index, bool is_slice);
mp_obj_t mp_obj_len_maybe(mp_obj_t o_in); /* may return NULL */
// none

4
py/objarray.c
View File

@ -113,7 +113,7 @@ STATIC mp_obj_t array_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
switch (op) {
case RT_BINARY_OP_SUBSCR:
{
uint index = mp_get_index(o->base.type, o->len, rhs);
uint index = mp_get_index(o->base.type, o->len, rhs, false);
return mp_binary_get_val(o->typecode, o->items, index);
}
@ -140,7 +140,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_2(array_append_obj, array_append);
STATIC bool array_store_item(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {
mp_obj_array_t *o = self_in;
uint index = mp_get_index(o->base.type, o->len, index_in);
uint index = mp_get_index(o->base.type, o->len, index_in, false);
mp_binary_set_val(o->typecode, o->items, index, value);
return true;
}

6
py/objlist.c
View File

@ -104,7 +104,7 @@ STATIC mp_obj_t list_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
return res;
}
#endif
uint index = mp_get_index(o->base.type, o->len, rhs);
uint index = mp_get_index(o->base.type, o->len, rhs, false);
return o->items[index];
}
case RT_BINARY_OP_ADD:
@ -190,7 +190,7 @@ STATIC mp_obj_t list_pop(uint n_args, const mp_obj_t *args) {
if (self->len == 0) {
nlr_jump(mp_obj_new_exception_msg(&mp_type_IndexError, "pop from empty list"));
}
uint index = mp_get_index(self->base.type, self->len, n_args == 1 ? mp_obj_new_int(-1) : args[1]);
uint index = mp_get_index(self->base.type, self->len, n_args == 1 ? mp_obj_new_int(-1) : args[1], false);
mp_obj_t ret = self->items[index];
self->len -= 1;
memcpy(self->items + index, self->items + index + 1, (self->len - index) * sizeof(mp_obj_t));
@ -383,7 +383,7 @@ void mp_obj_list_get(mp_obj_t self_in, uint *len, mp_obj_t **items) {
void mp_obj_list_store(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
mp_obj_list_t *self = self_in;
uint i = mp_get_index(self->base.type, self->len, index);
uint i = mp_get_index(self->base.type, self->len, index, false);
self->items[i] = value;
}

48
py/objstr.c
View File

@ -107,7 +107,7 @@ STATIC mp_obj_t str_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
// TODO: need predicate to check for int-like type (bools are such for example)
// ["no", "yes"][1 == 2] is common idiom
if (MP_OBJ_IS_SMALL_INT(rhs_in)) {
uint index = mp_get_index(mp_obj_get_type(lhs_in), lhs_len, rhs_in);
uint index = mp_get_index(mp_obj_get_type(lhs_in), lhs_len, rhs_in, false);
if (MP_OBJ_IS_TYPE(lhs_in, &bytes_type)) {
return MP_OBJ_NEW_SMALL_INT((mp_small_int_t)lhs_data[index]);
} else {
@ -290,10 +290,10 @@ STATIC mp_obj_t str_find(uint n_args, const mp_obj_t *args) {
size_t end = haystack_len;
/* TODO use a non-exception-throwing mp_get_index */
if (n_args >= 3 && args[2] != mp_const_none) {
start = mp_get_index(&str_type, haystack_len, args[2]);
start = mp_get_index(&str_type, haystack_len, args[2], true);
}
if (n_args >= 4 && args[3] != mp_const_none) {
end = mp_get_index(&str_type, haystack_len, args[3]);
end = mp_get_index(&str_type, haystack_len, args[3], true);
}
const byte *p = find_subbytes(haystack + start, haystack_len - start, needle, needle_len);
@ -487,6 +487,46 @@ STATIC mp_obj_t str_replace(uint n_args, const mp_obj_t *args) {
return mp_obj_str_builder_end(replaced_str);
}
STATIC mp_obj_t str_count(uint n_args, const mp_obj_t *args) {
assert(2 <= n_args && n_args <= 4);
assert(MP_OBJ_IS_STR(args[0]));
assert(MP_OBJ_IS_STR(args[1]));
GET_STR_DATA_LEN(args[0], haystack, haystack_len);
GET_STR_DATA_LEN(args[1], needle, needle_len);
size_t start = 0;
size_t end = haystack_len;
/* TODO use a non-exception-throwing mp_get_index */
if (n_args >= 3 && args[2] != mp_const_none) {
start = mp_get_index(&str_type, haystack_len, args[2], true);
}
if (n_args >= 4 && args[3] != mp_const_none) {
end = mp_get_index(&str_type, haystack_len, args[3], true);
}
machine_int_t num_occurrences = 0;
// needle won't exist in haystack if it's longer, so nothing to count
if (needle_len > haystack_len) {
MP_OBJ_NEW_SMALL_INT(0);
}
for (machine_uint_t haystack_index = start; haystack_index <= end; haystack_index++) {
for (machine_uint_t needle_index = 0; needle_index < needle_len; needle_index++) {
if ((haystack_index + needle_len) > end) {
return MP_OBJ_NEW_SMALL_INT(num_occurrences);
}
if (haystack[haystack_index + needle_index] == needle[needle_index] && needle_index == (needle_len - 1)) {
num_occurrences++;
}
}
}
return MP_OBJ_NEW_SMALL_INT(num_occurrences);
}
STATIC machine_int_t str_get_buffer(mp_obj_t self_in, buffer_info_t *bufinfo, int flags) {
if (flags == BUFFER_READ) {
GET_STR_DATA_LEN(self_in, str_data, str_len);
@ -508,6 +548,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_2(str_startswith_obj, str_startswith);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_strip_obj, 1, 2, str_strip);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR(str_format_obj, 1, str_format);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_replace_obj, 3, 4, str_replace);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_count_obj, 2, 4, str_count);
STATIC const mp_method_t str_type_methods[] = {
{ "find", &str_find_obj },
@ -517,6 +558,7 @@ STATIC const mp_method_t str_type_methods[] = {
{ "strip", &str_strip_obj },
{ "format", &str_format_obj },
{ "replace", &str_replace_obj },
{ "count", &str_count_obj },
{ NULL, NULL }, // end-of-list sentinel
};

2
py/objtuple.c
View File

@ -111,7 +111,7 @@ mp_obj_t tuple_binary_op(int op, mp_obj_t lhs, mp_obj_t rhs) {
return res;
}
#endif
uint index = mp_get_index(o->base.type, o->len, rhs);
uint index = mp_get_index(o->base.type, o->len, rhs, false);
return o->items[index];
}
case RT_BINARY_OP_ADD:

4
py/sequence.c
View File

@ -149,9 +149,9 @@ mp_obj_t mp_seq_index_obj(const mp_obj_t *items, uint len, uint n_args, const mp
uint stop = len;
if (n_args >= 3) {
start = mp_get_index(type, len, args[2]);
start = mp_get_index(type, len, args[2], true);
if (n_args >= 4) {
stop = mp_get_index(type, len, args[3]);
stop = mp_get_index(type, len, args[3], true);
}
}

10
tests/basics/list_index.py
View File

@ -3,6 +3,16 @@ print(a.index(1))
print(a.index(2))
print(a.index(3))
print(a.index(3, 2))
print(a.index(1, -100))
print(a.index(1, False))
try:
print(a.index(1, True))
except ValueError:
print("Raised ValueError")
else:
print("Did not raise ValueError")
try:
print(a.index(3, 2, 2))
except ValueError:

21
tests/basics/string_count.py Normal file
View File

@ -0,0 +1,21 @@
print("asdfasdfaaa".count("asdf", -100))
print("asdfasdfaaa".count("asdf", -8))
print("asdf".count('s', True))
print("asdf".count('a', True))
print("asdf".count('a', False))
print("asdf".count('a', 1 == 2))
print("hello world".count('l'))
print("hello world".count('l', 5))
print("hello world".count('l', 3))
print("hello world".count('z', 3, 6))
print("aaaa".count('a'))
print("aaaa".count('a', 0, 3))
print("aaaa".count('a', 0, 4))
print("aaaa".count('a', 0, 5))
print("aaaa".count('a', 1, 5))
print("aaaa".count('a', -1, 5))
def t():
return True
print("0000".count('0', t()))

12
tests/basics/string_find.py
View File

@ -9,3 +9,15 @@ print("hello world".find("ll", 1, 2))
print("hello world".find("ll", 1, 3))
print("hello world".find("ll", 1, 4))
print("hello world".find("ll", 1, 5))
print("hello world".find("ll", -100))
print("0000".find('0'))
print("0000".find('0', 0))
print("0000".find('0', 1))
print("0000".find('0', 2))
print("0000".find('0', 3))
print("0000".find('0', 4))
print("0000".find('0', 5))
print("0000".find('-1', 3))
print("0000".find('1', 3))
print("0000".find('1', 4))
print("0000".find('1', 5))