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#
include
"
json_utils.h
"
namespace
node
{
std::string
EscapeJsonChars
(std::string_view str) {
//
'static constexpr' is slightly better than static const
//
since the initialization occurs at compile time.
//
See https://lemire.me/blog/I3Cah
static
constexpr
std::string_view control_symbols[
0x20
] = {
"
\\
u0000
"
,
"
\\
u0001
"
,
"
\\
u0002
"
,
"
\\
u0003
"
,
"
\\
u0004
"
,
"
\\
u0005
"
,
"
\\
u0006
"
,
"
\\
u0007
"
,
"
\\
b
"
,
"
\\
t
"
,
"
\\
n
"
,
"
\\
u000b
"
,
"
\\
f
"
,
"
\\
r
"
,
"
\\
u000e
"
,
"
\\
u000f
"
,
"
\\
u0010
"
,
"
\\
u0011
"
,
"
\\
u0012
"
,
"
\\
u0013
"
,
"
\\
u0014
"
,
"
\\
u0015
"
,
"
\\
u0016
"
,
"
\\
u0017
"
,
"
\\
u0018
"
,
"
\\
u0019
"
,
"
\\
u001a
"
,
"
\\
u001b
"
,
"
\\
u001c
"
,
"
\\
u001d
"
,
"
\\
u001e
"
,
"
\\
u001f
"
};
std::string ret;
size_t
last_pos =
0
;
size_t
pos =
0
;
for
(; pos < str.
size
(); ++pos) {
std::string replace;
char
ch = str[pos];
if
(ch ==
'
\\
'
) {
replace =
"
\\\\
"
;
}
else
if
(ch ==
'
\"
'
) {
replace =
"
\\\"
"
;
}
else
{
size_t
num =
static_cast
<
size_t
>(ch);
if
(num <
0x20
) replace = control_symbols[num];
}
if
(!replace.
empty
()) {
if
(pos > last_pos) {
ret += str.
substr
(last_pos, pos - last_pos);
}
last_pos = pos +
1
;
ret += replace;
}
}
//
Append any remaining symbols.
if
(last_pos < str.
size
()) {
ret += str.
substr
(last_pos, pos - last_pos);
}
return
ret;
}
std::string
Reindent
(
const
std::string& str,
int
indent_depth) {
if
(indent_depth <=
0
)
return
str;
const
std::string
indent
(indent_depth,
'
'
);
std::string out;
std::string::size_type pos =
0
;
for
(;;) {
std::string::size_type prev_pos = pos;
pos = str.
find
(
'
\n
'
, pos);
out.
append
(indent);
if
(pos == std::string::npos) {
out.
append
(str, prev_pos, std::string::npos);
break
;
}
else
{
pos++;
out.
append
(str, prev_pos, pos - prev_pos);
}
}
return
out;
}
}
//
namespace node
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