#include 
#include 
std
::
vector

split
(
const
std
::
string
&
str
,
const
std
::
string
&
delim
)
{
std
::
vector

strings
;
size_t start
;
size_t end
=
0
;
while
(
(
start
=
str
.
find_first_not_of
(
delim
,
end
)
)
!=
std
::
string
::
npos
)
{
end
=
str
.
find
(
delim
,
start
)
;
strings
.
push_back
(
str
.
substr
(
start
,
end
-
start
)
)
;
}
return
strings
;
}
std
::
uint32_t
utf8_encode
(
char
*
out
,
uint32_t
utf
)
{
if
(
utf
>
6
)
&
0x1F
)
|
0xC0
)
;
out
[
1
]
=
(
char
)
(
(
(
utf
>>
0
)
&
0x3F
)
|
0x80
)
;
out
[
2
]
=
0
;
return
2
;
}
else
if
(
utf
>
12
)
&
0x0F
)
|
0xE0
)
;
out
[
1
]
=
(
char
)
(
(
(
utf
>>
6
)
&
0x3F
)
|
0x80
)
;
out
[
2
]
=
(
char
)
(
(
(
utf
>>
0
)
&
0x3F
)
|
0x80
)
;
out
[
3
]
=
0
;
return
3
;
}
else
if
(
utf
>
18
)
&
0x07
)
|
0xF0
)
;
out
[
1
]
=
(
char
)
(
(
(
utf
>>
12
)
&
0x3F
)
|
0x80
)
;
out
[
2
]
=
(
char
)
(
(
(
utf
>>
6
)
&
0x3F
)
|
0x80
)
;
out
[
3
]
=
(
char
)
(
(
(
utf
>>
0
)
&
0x3F
)
|
0x80
)
;
out
[
4
]
=
0
;
return
4
;
}
else
{
// error - use replacement character
out
[
0
]
=
(
char
)
0xEF
;
out
[
1
]
=
(
char
)
0xBF
;
out
[
2
]
=
(
char
)
0xBD
;
out
[
3
]
=
0
;
return
0
;
}
}
std
::
string
cp_to_utf8
(
const
std
::
string
&
input
)
{
std
::
string out
;
auto
points
=
split
(
input
,
R"(\u)"
)
;
for
(
auto
&
p
:
points
)
{
char
buf
[
8
]
;
auto
len
=
utf8_encode
(
buf
,
std
::
stoi
(
p
,
nullptr
,
16
)
)
;
out
.
append
(
std
::
string
{
buf
,
len
}
)
;
}
return
out
;
}