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/**
* Object#toString() ref for stringify().
*/
var
toString
=
Object
.
prototype
.
toString
;
/**
* Object#hasOwnProperty ref
*/
var
hasOwnProperty
=
Object
.
prototype
.
hasOwnProperty
;
/**
* Array#indexOf shim.
*/
var
indexOf
=
typeof
Array
.
prototype
.
indexOf
===
'function'
?
function
(
arr
,
el
)
{
return
arr
.
indexOf
(
el
)
;
}
:
function
(
arr
,
el
)
{
for
(
var
i
=
0
;
i
<
arr
.
length
;
i
++
)
{
if
(
arr
[
i
]
===
el
)
return
i
;
}
return
-
1
;
}
;
/**
* Array.isArray shim.
*/
var
isArray
=
Array
.
isArray
||
function
(
arr
)
{
return
toString
.
call
(
arr
)
==
'[object Array]'
;
}
;
/**
* Object.keys shim.
*/
var
objectKeys
=
Object
.
keys
||
function
(
obj
)
{
var
ret
=
[
]
;
for
(
var
key
in
obj
)
{
if
(
obj
.
hasOwnProperty
(
key
)
)
{
ret
.
push
(
key
)
;
}
}
return
ret
;
}
;
/**
* Array#forEach shim.
*/
var
forEach
=
typeof
Array
.
prototype
.
forEach
===
'function'
?
function
(
arr
,
fn
)
{
return
arr
.
forEach
(
fn
)
;
}
:
function
(
arr
,
fn
)
{
for
(
var
i
=
0
;
i
<
arr
.
length
;
i
++
)
fn
(
arr
[
i
]
)
;
}
;
/**
* Array#reduce shim.
*/
var
reduce
=
function
(
arr
,
fn
,
initial
)
{
if
(
typeof
arr
.
reduce
===
'function'
)
return
arr
.
reduce
(
fn
,
initial
)
;
var
res
=
initial
;
for
(
var
i
=
0
;
i
<
arr
.
length
;
i
++
)
res
=
fn
(
res
,
arr
[
i
]
)
;
return
res
;
}
;
/**
* Cache non-integer test regexp.
*/
var
isint
=
/
^
[
0
-
9
]
+
$
/
;
function
promote
(
parent
,
key
)
{
if
(
parent
[
key
]
.
length
==
0
)
return
parent
[
key
]
=
{
}
var
t
=
{
}
;
for
(
var
i
in
parent
[
key
]
)
{
if
(
hasOwnProperty
.
call
(
parent
[
key
]
,
i
)
)
{
t
[
i
]
=
parent
[
key
]
[
i
]
;
}
}
parent
[
key
]
=
t
;
return
t
;
}
function
parse
(
parts
,
parent
,
key
,
val
)
{
var
part
=
parts
.
shift
(
)
;
// illegal
if
(
hasOwnProperty
.
call
(
Object
.
prototype
,
key
)
)
return
;
// end
if
(
!
part
)
{
if
(
isArray
(
parent
[
key
]
)
)
{
parent
[
key
]
.
push
(
val
)
;
}
else
if
(
'object'
==
typeof
parent
[
key
]
)
{
parent
[
key
]
=
val
;
}
else
if
(
'undefined'
==
typeof
parent
[
key
]
)
{
parent
[
key
]
=
val
;
}
else
{
parent
[
key
]
=
[
parent
[
key
]
,
val
]
;
}
// array
}
else
{
var
obj
=
parent
[
key
]
=
parent
[
key
]
||
[
]
;
if
(
']'
==
part
)
{
if
(
isArray
(
obj
)
)
{
if
(
''
!=
val
)
obj
.
push
(
val
)
;
}
else
if
(
'object'
==
typeof
obj
)
{
obj
[
objectKeys
(
obj
)
.
length
]
=
val
;
}
else
{
obj
=
parent
[
key
]
=
[
parent
[
key
]
,
val
]
;
}
// prop
}
else
if
(
~
indexOf
(
part
,
']'
)
)
{
part
=
part
.
substr
(
0
,
part
.
length
-
1
)
;
if
(
!
isint
.
test
(
part
)
&&
isArray
(
obj
)
)
obj
=
promote
(
parent
,
key
)
;
parse
(
parts
,
obj
,
part
,
val
)
;
// key
}
else
{
if
(
!
isint
.
test
(
part
)
&&
isArray
(
obj
)
)
obj
=
promote
(
parent
,
key
)
;
parse
(
parts
,
obj
,
part
,
val
)
;
}
}
}
/**
* Merge parent key/val pair.
*/
function
merge
(
parent
,
key
,
val
)
{
if
(
~
indexOf
(
key
,
']'
)
)
{
var
parts
=
key
.
split
(
'['
)
,
len
=
parts
.
length
,
last
=
len
-
1
;
parse
(
parts
,
parent
,
'base'
,
val
)
;
// optimize
}
else
{
if
(
!
isint
.
test
(
key
)
&&
isArray
(
parent
.
base
)
)
{
var
t
=
{
}
;
for
(
var
k
in
parent
.
base
)
t
[
k
]
=
parent
.
base
[
k
]
;
parent
.
base
=
t
;
}
set
(
parent
.
base
,
key
,
val
)
;
}
return
parent
;
}
/**
* Compact sparse arrays.
*/
function
compact
(
obj
)
{
if
(
'object'
!=
typeof
obj
)
return
obj
;
if
(
isArray
(
obj
)
)
{
var
ret
=
[
]
;
for
(
var
i
in
obj
)
{
if
(
hasOwnProperty
.
call
(
obj
,
i
)
)
{
ret
.
push
(
obj
[
i
]
)
;
}
}
return
ret
;
}
for
(
var
key
in
obj
)
{
obj
[
key
]
=
compact
(
obj
[
key
]
)
;
}
return
obj
;
}
/**
* Parse the given obj.
*/
function
parseObject
(
obj
)
{
var
ret
=
{
base
:
{
}
}
;
forEach
(
objectKeys
(
obj
)
,
function
(
name
)
{
merge
(
ret
,
name
,
obj
[
name
]
)
;
}
)
;
return
compact
(
ret
.
base
)
;
}
/**
* Parse the given str.
*/
function
parseString
(
str
,
options
)
{
var
ret
=
reduce
(
String
(
str
)
.
split
(
options
.
separator
)
,
function
(
ret
,
pair
)
{
var
eql
=
indexOf
(
pair
,
'='
)
,
brace
=
lastBraceInKey
(
pair
)
,
key
=
pair
.
substr
(
0
,
brace
||
eql
)
,
val
=
pair
.
substr
(
brace
||
eql
,
pair
.
length
)
,
val
=
val
.
substr
(
indexOf
(
val
,
'='
)
+
1
,
val
.
length
)
;
// ?foo
if
(
''
==
key
)
key
=
pair
,
val
=
''
;
if
(
''
==
key
)
return
ret
;
return
merge
(
ret
,
decode
(
key
)
,
decode
(
val
)
)
;
}
,
{
base
:
{
}
}
)
.
base
;
return
compact
(
ret
)
;
}
/**
* Parse the given query `str` or `obj`, returning an object.
*
*
@param
{
String
} str | {Object} obj
*
@return
{
Object
}
*
@api
public
*/
exports
.
parse
=
function
(
str
,
options
)
{
if
(
null
==
str
||
''
==
str
)
return
{
}
;
options
=
options
||
{
}
;
options
.
separator
=
options
.
separator
||
'&'
;
return
'object'
==
typeof
str
?
parseObject
(
str
)
:
parseString
(
str
,
options
)
;
}
;
/**
* Turn the given `obj` into a query string
*
*
@param
{
Object
} obj
*
@return
{
String
}
*
@api
public
*/
var
stringify
=
exports
.
stringify
=
function
(
obj
,
prefix
)
{
if
(
isArray
(
obj
)
)
{
return
stringifyArray
(
obj
,
prefix
)
;
}
else
if
(
'[object Object]'
==
toString
.
call
(
obj
)
)
{
return
stringifyObject
(
obj
,
prefix
)
;
}
else
if
(
'string'
==
typeof
obj
)
{
return
stringifyString
(
obj
,
prefix
)
;
}
else
{
return
prefix
+
'='
+
encodeURIComponent
(
String
(
obj
)
)
;
}
}
;
/**
* Stringify the given `str`.
*
*
@param
{
String
} str
*
@param
{
String
} prefix
*
@return
{
String
}
*
@api
private
*/
function
stringifyString
(
str
,
prefix
)
{
if
(
!
prefix
)
throw
new
TypeError
(
'stringify expects an object'
)
;
return
prefix
+
'='
+
encodeURIComponent
(
str
)
;
}
/**
* Stringify the given `arr`.
*
*
@param
{
Array
} arr
*
@param
{
String
} prefix
*
@return
{
String
}
*
@api
private
*/
function
stringifyArray
(
arr
,
prefix
)
{
var
ret
=
[
]
;
if
(
!
prefix
)
throw
new
TypeError
(
'stringify expects an object'
)
;
for
(
var
i
=
0
;
i
<
arr
.
length
;
i
++
)
{
ret
.
push
(
stringify
(
arr
[
i
]
,
prefix
+
'['
+
i
+
']'
)
)
;
}
return
ret
.
join
(
'&'
)
;
}
/**
* Stringify the given `obj`.
*
*
@param
{
Object
} obj
*
@param
{
String
} prefix
*
@return
{
String
}
*
@api
private
*/
function
stringifyObject
(
obj
,
prefix
)
{
var
ret
=
[
]
,
keys
=
objectKeys
(
obj
)
,
key
;
for
(
var
i
=
0
,
len
=
keys
.
length
;
i
<
len
;
++
i
)
{
key
=
keys
[
i
]
;
if
(
''
==
key
)
continue
;
if
(
null
==
obj
[
key
]
)
{
ret
.
push
(
encodeURIComponent
(
key
)
+
'='
)
;
}
else
{
ret
.
push
(
stringify
(
obj
[
key
]
,
prefix
?
prefix
+
'['
+
encodeURIComponent
(
key
)
+
']'
:
encodeURIComponent
(
key
)
)
)
;
}
}
return
ret
.
join
(
'&'
)
;
}
/**
* Set `obj`'s `key` to `val` respecting
* the weird and wonderful syntax of a qs,
* where "foo=bar&foo=baz" becomes an array.
*
*
@param
{
Object
} obj
*
@param
{
String
} key
*
@param
{
String
} val
*
@api
private
*/
function
set
(
obj
,
key
,
val
)
{
var
v
=
obj
[
key
]
;
if
(
hasOwnProperty
.
call
(
Object
.
prototype
,
key
)
)
return
;
if
(
undefined
===
v
)
{
obj
[
key
]
=
val
;
}
else
if
(
isArray
(
v
)
)
{
v
.
push
(
val
)
;
}
else
{
obj
[
key
]
=
[
v
,
val
]
;
}
}
/**
* Locate last brace in `str` within the key.
*
*
@param
{
String
} str
*
@return
{
Number
}
*
@api
private
*/
function
lastBraceInKey
(
str
)
{
var
len
=
str
.
length
,
brace
,
c
;
for
(
var
i
=
0
;
i
<
len
;
++
i
)
{
c
=
str
[
i
]
;
if
(
']'
==
c
)
brace
=
false
;
if
(
'['
==
c
)
brace
=
true
;
if
(
'='
==
c
&&
!
brace
)
return
i
;
}
}
/**
* Decode `str`.
*
*
@param
{
String
} str
*
@return
{
String
}
*
@api
private
*/
function
decode
(
str
)
{
try
{
return
decodeURIComponent
(
str
.
replace
(
/
\+
/
g
,
' '
)
)
;
}
catch
(
err
)
{
return
str
;
}
}
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