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Implement simplest case of str.startswith().

This commit is contained in:
Paul Sokolovsky 2014-01-23 01:20:40 +02:00
parent b979122dfb
commit 1eacefe5bc
2 changed files with 17 additions and 0 deletions
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12
py/objstr.c
View File

@ -278,6 +278,16 @@ static mp_obj_t str_find(uint n_args, const mp_obj_t *args) {
}
}
// TODO: (Much) more variety in args
static mp_obj_t str_startswith(mp_obj_t self_in, mp_obj_t arg) {
GET_STR_DATA_LEN(self_in, str, str_len);
GET_STR_DATA_LEN(arg, prefix, prefix_len);
if (prefix_len > str_len) {
return mp_const_false;
}
return MP_BOOL(memcmp(str, prefix, prefix_len) == 0);
}
static bool chr_in_str(const byte* const str, const size_t str_len, int c) {
for (size_t i = 0; i < str_len; i++) {
if (str[i] == c) {
@ -364,6 +374,7 @@ mp_obj_t str_format(uint n_args, const mp_obj_t *args) {
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_find_obj, 2, 4, str_find);
static MP_DEFINE_CONST_FUN_OBJ_2(str_join_obj, str_join);
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(str_split_obj, 1, 3, str_split);
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);
@ -371,6 +382,7 @@ static const mp_method_t str_type_methods[] = {
{ "find", &str_find_obj },
{ "join", &str_join_obj },
{ "split", &str_split_obj },
{ "startswith", &str_startswith_obj },
{ "strip", &str_strip_obj },
{ "format", &str_format_obj },
{ NULL, NULL }, // end-of-list sentinel

5
tests/basics/string_startswith.py Normal file
View File

@ -0,0 +1,5 @@
print("foobar".startswith("foo"))
print("foobar".startswith("Foo"))
print("foobar".startswith("foo1"))
print("foobar".startswith("foobar"))
print("foobar".startswith(""))