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// Query String Utilities
var
QueryString
=
exports
;
var
urlDecode
=
process
.
binding
(
'http_parser'
)
.
urlDecode
;
function
charCode
(
c
)
{
return
c
.
charCodeAt
(
0
)
;
}
// a safe fast alternative to decodeURIComponent
QueryString
.
unescapeBuffer
=
function
(
s
,
decodeSpaces
)
{
var
out
=
new
Buffer
(
s
.
length
)
;
var
state
=
'CHAR'
;
// states: CHAR, HEX0, HEX1
var
n
,
m
,
hexchar
;
for
(
var
inIndex
=
0
,
outIndex
=
0
;
inIndex
<=
s
.
length
;
inIndex
++
)
{
var
c
=
s
.
charCodeAt
(
inIndex
)
;
switch
(
state
)
{
case
'CHAR'
:
switch
(
c
)
{
case
charCode
(
'%'
)
:
n
=
0
;
m
=
0
;
state
=
'HEX0'
;
break
;
case
charCode
(
'+'
)
:
if
(
decodeSpaces
)
c
=
charCode
(
' '
)
;
// pass thru
default
:
out
[
outIndex
++
]
=
c
;
break
;
}
break
;
case
'HEX0'
:
state
=
'HEX1'
;
hexchar
=
c
;
if
(
charCode
(
'0'
)
<=
c
&&
c
<=
charCode
(
'9'
)
)
{
n
=
c
-
charCode
(
'0'
)
;
}
else
if
(
charCode
(
'a'
)
<=
c
&&
c
<=
charCode
(
'f'
)
)
{
n
=
c
-
charCode
(
'a'
)
+
10
;
}
else
if
(
charCode
(
'A'
)
<=
c
&&
c
<=
charCode
(
'F'
)
)
{
n
=
c
-
charCode
(
'A'
)
+
10
;
}
else
{
out
[
outIndex
++
]
=
charCode
(
'%'
)
;
out
[
outIndex
++
]
=
c
;
state
=
'CHAR'
;
break
;
}
break
;
case
'HEX1'
:
state
=
'CHAR'
;
if
(
charCode
(
'0'
)
<=
c
&&
c
<=
charCode
(
'9'
)
)
{
m
=
c
-
charCode
(
'0'
)
;
}
else
if
(
charCode
(
'a'
)
<=
c
&&
c
<=
charCode
(
'f'
)
)
{
m
=
c
-
charCode
(
'a'
)
+
10
;
}
else
if
(
charCode
(
'A'
)
<=
c
&&
c
<=
charCode
(
'F'
)
)
{
m
=
c
-
charCode
(
'A'
)
+
10
;
}
else
{
out
[
outIndex
++
]
=
charCode
(
'%'
)
;
out
[
outIndex
++
]
=
hexchar
;
out
[
outIndex
++
]
=
c
;
break
;
}
out
[
outIndex
++
]
=
16
*
n
+
m
;
break
;
}
}
// TODO support returning arbitrary buffers.
return
out
.
slice
(
0
,
outIndex
-
1
)
;
}
;
QueryString
.
unescape
=
function
(
s
,
decodeSpaces
)
{
return
QueryString
.
unescapeBuffer
(
s
,
decodeSpaces
)
.
toString
(
)
;
}
;
QueryString
.
escape
=
function
(
str
)
{
return
encodeURIComponent
(
str
)
;
}
;
var
stringifyPrimitive
=
function
(
v
)
{
switch
(
typeof
v
)
{
case
'string'
:
return
v
;
case
'boolean'
:
return
v
?
'true'
:
'false'
;
case
'number'
:
return
isFinite
(
v
)
?
v
:
''
;
default
:
return
''
;
}
}
;
QueryString
.
stringify
=
QueryString
.
encode
=
function
(
obj
,
sep
,
eq
,
name
)
{
sep
=
sep
||
'&'
;
eq
=
eq
||
'='
;
obj
=
(
obj
===
null
)
?
undefined
:
obj
;
switch
(
typeof
obj
)
{
case
'object'
:
return
Object
.
keys
(
obj
)
.
map
(
function
(
k
)
{
if
(
Array
.
isArray
(
obj
[
k
]
)
)
{
return
obj
[
k
]
.
map
(
function
(
v
)
{
return
QueryString
.
escape
(
stringifyPrimitive
(
k
)
)
+
eq
+
QueryString
.
escape
(
stringifyPrimitive
(
v
)
)
;
}
)
.
join
(
sep
)
;
}
else
{
return
QueryString
.
escape
(
stringifyPrimitive
(
k
)
)
+
eq
+
QueryString
.
escape
(
stringifyPrimitive
(
obj
[
k
]
)
)
;
}
}
)
.
join
(
sep
)
;
default
:
if
(
!
name
)
return
''
;
return
QueryString
.
escape
(
stringifyPrimitive
(
name
)
)
+
eq
+
QueryString
.
escape
(
stringifyPrimitive
(
obj
)
)
;
}
}
;
// Parse a key=val string.
QueryString
.
parse
=
QueryString
.
decode
=
function
(
qs
,
sep
,
eq
)
{
sep
=
sep
||
'&'
;
eq
=
eq
||
'='
;
var
obj
=
{
}
;
if
(
typeof
qs
!==
'string'
||
qs
.
length
===
0
)
{
return
obj
;
}
qs
.
split
(
sep
)
.
forEach
(
function
(
kvp
)
{
var
x
=
kvp
.
split
(
eq
)
;
var
k
=
QueryString
.
unescape
(
x
[
0
]
,
true
)
;
var
v
=
QueryString
.
unescape
(
x
.
slice
(
1
)
.
join
(
eq
)
,
true
)
;
if
(
!
(
k
in
obj
)
)
{
obj
[
k
]
=
v
;
}
else
if
(
!
Array
.
isArray
(
obj
[
k
]
)
)
{
obj
[
k
]
=
[
obj
[
k
]
,
v
]
;
}
else
{
obj
[
k
]
.
push
(
v
)
;
}
}
)
;
return
obj
;
}
;
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