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/**
* This is the web browser implementation of `debug()`.
*
* Expose `debug()` as the module.
*/
exports
=
module
.
exports
=
require
(
'./debug'
)
;
exports
.
log
=
log
;
exports
.
formatArgs
=
formatArgs
;
exports
.
save
=
save
;
exports
.
load
=
load
;
exports
.
useColors
=
useColors
;
exports
.
storage
=
'undefined'
!=
typeof
chrome
&&
'undefined'
!=
typeof
chrome
.
storage
?
chrome
.
storage
.
local
:
localstorage
(
)
;
/**
* Colors.
*/
exports
.
colors
=
[
'lightseagreen'
,
'forestgreen'
,
'goldenrod'
,
'dodgerblue'
,
'darkorchid'
,
'crimson'
]
;
/**
* Currently only WebKit-based Web Inspectors, Firefox >= v31,
* and the Firebug extension (any Firefox version) are known
* to support "%c" CSS customizations.
*
* TODO: add a `localStorage` variable to explicitly enable/disable colors
*/
function
useColors
(
)
{
// is webkit? http://stackoverflow.com/a/16459606/376773
return
(
'WebkitAppearance'
in
document
.
documentElement
.
style
)
||
// is firebug? http://stackoverflow.com/a/398120/376773
(
window
.
console
&&
(
console
.
firebug
||
(
console
.
exception
&&
console
.
table
)
)
)
||
// is firefox >= v31?
// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages
(
navigator
.
userAgent
.
toLowerCase
(
)
.
match
(
/
f
i
r
e
f
o
x
\/
(
\d
+
)
/
)
&&
parseInt
(
RegExp
.
$1
,
10
)
>=
31
)
;
}
/**
* Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.
*/
exports
.
formatters
.
j
=
function
(
v
)
{
return
JSON
.
stringify
(
v
)
;
}
;
/**
* Colorize log arguments if enabled.
*
*
@api
public
*/
function
formatArgs
(
)
{
var
args
=
arguments
;
var
useColors
=
this
.
useColors
;
args
[
0
]
=
(
useColors
?
'%c'
:
''
)
+
this
.
namespace
+
(
useColors
?
' %c'
:
' '
)
+
args
[
0
]
+
(
useColors
?
'%c '
:
' '
)
+
'+'
+
exports
.
humanize
(
this
.
diff
)
;
if
(
!
useColors
)
return
args
;
var
c
=
'color: '
+
this
.
color
;
args
=
[
args
[
0
]
,
c
,
'color: inherit'
]
.
concat
(
Array
.
prototype
.
slice
.
call
(
args
,
1
)
)
;
// the final "%c" is somewhat tricky, because there could be other
// arguments passed either before or after the %c, so we need to
// figure out the correct index to insert the CSS into
var
index
=
0
;
var
lastC
=
0
;
args
[
0
]
.
replace
(
/
%
[
a
-
z
%
]
/
g
,
function
(
match
)
{
if
(
'%%'
===
match
)
return
;
index
++
;
if
(
'%c'
===
match
)
{
// we only are interested in the *last* %c
// (the user may have provided their own)
lastC
=
index
;
}
}
)
;
args
.
splice
(
lastC
,
0
,
c
)
;
return
args
;
}
/**
* Invokes `console.log()` when available.
* No-op when `console.log` is not a "function".
*
*
@api
public
*/
function
log
(
)
{
// this hackery is required for IE8/9, where
// the `console.log` function doesn't have 'apply'
return
'object'
===
typeof
console
&&
console
.
log
&&
Function
.
prototype
.
apply
.
call
(
console
.
log
,
console
,
arguments
)
;
}
/**
* Save `namespaces`.
*
*
@param
{
String
} namespaces
*
@api
private
*/
function
save
(
namespaces
)
{
try
{
if
(
null
==
namespaces
)
{
exports
.
storage
.
removeItem
(
'debug'
)
;
}
else
{
exports
.
storage
.
debug
=
namespaces
;
}
}
catch
(
e
)
{
}
}
/**
* Load `namespaces`.
*
*
@return
{
String
} returns the previously persisted debug modes
*
@api
private
*/
function
load
(
)
{
var
r
;
try
{
r
=
exports
.
storage
.
debug
;
}
catch
(
e
)
{
}
return
r
;
}
/**
* Enable namespaces listed in `localStorage.debug` initially.
*/
exports
.
enable
(
load
(
)
)
;
/**
* Localstorage attempts to return the localstorage.
*
* This is necessary because safari throws
* when a user disables cookies/localstorage
* and you attempt to access it.
*
*
@return
{
LocalStorage
}
*
@api
private
*/
function
localstorage
(
)
{
try
{
return
window
.
localStorage
;
}
catch
(
e
)
{
}
}
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