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node/lib/path.js at https · reado/node · GitHub
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path.js
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path.js
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function
validPathPart
(
p
,
keepBlanks
)
{
return
typeof
p
===
'string'
&&
(
p
||
keepBlanks
)
;
}
exports
.
join
=
function
(
)
{
var
args
=
Array
.
prototype
.
slice
.
call
(
arguments
)
;
// edge case flag to switch into url-resolve-mode
var
keepBlanks
=
false
;
if
(
args
[
args
.
length
-
1
]
===
true
)
{
keepBlanks
=
args
.
pop
(
)
;
}
// return exports.split(args.join("/"), keepBlanks).join("/");
var
joined
=
exports
.
normalizeArray
(
args
,
keepBlanks
)
.
join
(
'/'
)
;
return
joined
;
}
;
exports
.
split
=
function
(
path
,
keepBlanks
)
{
// split based on /, but only if that / is not at the start or end.
return
exports
.
normalizeArray
(
path
.
split
(
/
^
|
\/
(?
!
$
)
/
)
,
keepBlanks
)
;
}
;
function
cleanArray
(
parts
,
keepBlanks
)
{
var
i
=
0
;
var
l
=
parts
.
length
-
1
;
var
stripped
=
false
;
// strip leading empty args
while
(
i
<
l
&&
!
validPathPart
(
parts
[
i
]
,
keepBlanks
)
)
{
stripped
=
true
;
i
++
;
}
// strip tailing empty args
while
(
l
>=
i
&&
!
validPathPart
(
parts
[
l
]
,
keepBlanks
)
)
{
stripped
=
true
;
l
--
;
}
if
(
stripped
)
{
// if l chopped all the way back to i, then this is empty
parts
=
Array
.
prototype
.
slice
.
call
(
parts
,
i
,
l
+
1
)
;
}
return
parts
.
filter
(
function
(
p
)
{
return
validPathPart
(
p
,
keepBlanks
)
}
)
.
join
(
'/'
)
.
split
(
/
^
|
\/
(?
!
$
)
/
)
;
}
exports
.
normalizeArray
=
function
(
original
,
keepBlanks
)
{
var
parts
=
cleanArray
(
original
,
keepBlanks
)
;
if
(
!
parts
.
length
||
(
parts
.
length
===
1
&&
!
parts
[
0
]
)
)
return
[
'.'
]
;
// now we're fully ready to rock.
// leading/trailing invalids have been stripped off.
// if it comes in starting with a slash, or ending with a slash,
var
leadingSlash
=
(
parts
[
0
]
.
charAt
(
0
)
===
'/'
)
;
if
(
leadingSlash
)
parts
[
0
]
=
parts
[
0
]
.
substr
(
1
)
;
var
last
=
parts
.
slice
(
-
1
)
[
0
]
;
var
tailingSlash
=
(
last
.
substr
(
-
1
)
===
'/'
)
;
if
(
tailingSlash
)
parts
[
parts
.
length
-
1
]
=
last
.
slice
(
0
,
-
1
)
;
var
directories
=
[
]
;
var
prev
;
for
(
var
i
=
0
,
l
=
parts
.
length
-
1
;
i
<=
l
;
i
++
)
{
var
directory
=
parts
[
i
]
;
// if it's blank, and we're not keeping blanks, then skip it.
if
(
directory
===
''
&&
!
keepBlanks
)
continue
;
// if it's a dot, then skip it
if
(
directory
===
'.'
&&
(
directories
.
length
||
(
i
===
0
&&
!
(
tailingSlash
&&
i
===
l
)
)
||
(
i
===
0
&&
leadingSlash
)
)
)
continue
;
// if we're dealing with an absolute path, then discard ..s that go
// above that the base.
if
(
leadingSlash
&&
directories
.
length
===
0
&&
directory
===
'..'
)
{
continue
;
}
// trying to go up a dir
if
(
directory
===
'..'
&&
directories
.
length
&&
prev
!==
'..'
&&
prev
!==
undefined
)
{
directories
.
pop
(
)
;
prev
=
directories
.
slice
(
-
1
)
[
0
]
;
}
else
{
directories
.
push
(
directory
)
;
prev
=
directory
;
}
}
if
(
!
directories
.
length
)
{
directories
=
[
leadingSlash
||
tailingSlash
?
''
:
'.'
]
;
}
var
last
=
directories
.
slice
(
-
1
)
[
0
]
;
if
(
tailingSlash
&&
last
.
substr
(
-
1
)
!==
'/'
)
{
directories
[
directories
.
length
-
1
]
+=
'/'
;
}
if
(
leadingSlash
&&
directories
[
0
]
.
charAt
(
0
)
!==
'/'
)
{
if
(
directories
[
0
]
===
'.'
)
directories
[
0
]
=
''
;
directories
[
0
]
=
'/'
+
directories
[
0
]
;
}
return
directories
;
}
;
exports
.
normalize
=
function
(
path
,
keepBlanks
)
{
return
exports
.
join
(
path
,
keepBlanks
||
false
)
;
}
;
exports
.
dirname
=
function
(
path
)
{
if
(
path
.
length
>
1
&&
'/'
===
path
[
path
.
length
-
1
]
)
{
path
=
path
.
replace
(
/
\/
+
$
/
,
''
)
;
}
var
lastSlash
=
path
.
lastIndexOf
(
'/'
)
;
switch
(
lastSlash
)
{
case
-
1
:
return
'.'
;
case
0
:
return
'/'
;
default
:
return
path
.
substring
(
0
,
lastSlash
)
;
}
}
;
exports
.
basename
=
function
(
path
,
ext
)
{
var
f
=
path
.
substr
(
path
.
lastIndexOf
(
'/'
)
+
1
)
;
if
(
ext
&&
f
.
substr
(
-
1
*
ext
.
length
)
===
ext
)
{
f
=
f
.
substr
(
0
,
f
.
length
-
ext
.
length
)
;
}
return
f
;
}
;
exports
.
extname
=
function
(
path
)
{
var
dot
=
path
.
lastIndexOf
(
'.'
)
,
slash
=
path
.
lastIndexOf
(
'/'
)
;
// The last dot must be in the last path component, and it (the last dot) must
// not start the last path component (i.e. be a dot that signifies a hidden
// file in UNIX).
return
dot
<=
slash
+
1
?
''
:
path
.
substring
(
dot
)
;
}
;
exports
.
exists
=
function
(
path
,
callback
)
{
process
.
binding
(
'fs'
)
.
stat
(
path
,
function
(
err
,
stats
)
{
if
(
callback
)
callback
(
err
?
false
:
true
)
;
}
)
;
}
;
exports
.
existsSync
=
function
(
path
)
{
try
{
process
.
binding
(
'fs'
)
.
stat
(
path
)
;
return
true
;
}
catch
(
e
)
{
return
false
;
}
}
;
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