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javascript-stacktrace
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// Domain Public by Eric Wendelin http://eriwen.com/ (2008)
// Luke Smith http://lucassmith.name/ (2008)
// Loic Dachary <loic@dachary.org> (2008)
// Johan Euphrosine <proppy@aminche.com> (2008)
// Oyvind Sean Kinsey http://kinsey.no/blog (2010)
// Victor Homyakov <victor-homyakov@users.sourceforge.net> (2010)
/**
* Main function giving a function stack trace with a forced or passed in Error
*
*
@cfg
{Error} e The error to create a stacktrace from (optional)
*
@cfg
{Boolean} guess If we should try to resolve the names of anonymous functions
*
@return
{
Array
} of Strings with functions, lines, files, and arguments where possible
*/
function
printStackTrace
(
options
)
{
options
=
options
||
{
guess
:
true
}
;
var
ex
=
options
.
e
||
null
,
guess
=
!
!
options
.
guess
;
var
p
=
new
printStackTrace
.
implementation
(
)
,
result
=
p
.
run
(
ex
)
;
return
(
guess
)
?
p
.
guessAnonymousFunctions
(
result
)
:
result
;
}
if
(
typeof
module
!==
"undefined"
&&
module
.
exports
)
{
module
.
exports
=
printStackTrace
;
}
printStackTrace
.
implementation
=
function
(
)
{
}
;
printStackTrace
.
implementation
.
prototype
=
{
/**
*
@param
{
Error
} ex The error to create a stacktrace from (optional)
*
@param
{
String
} mode Forced mode (optional, mostly for unit tests)
*/
run
:
function
(
ex
,
mode
)
{
ex
=
ex
||
this
.
createException
(
)
;
// examine exception properties w/o debugger
//for (var prop in ex) {alert("Ex['" + prop + "']=" + ex[prop]);}
mode
=
mode
||
this
.
mode
(
ex
)
;
if
(
mode
===
'other'
)
{
return
this
.
other
(
arguments
.
callee
)
;
}
else
{
return
this
[
mode
]
(
ex
)
;
}
}
,
createException
:
function
(
)
{
try
{
this
.
undef
(
)
;
}
catch
(
e
)
{
return
e
;
}
}
,
/**
* Mode could differ for different exception, e.g.
* exceptions in Chrome may or may not have arguments or stack.
*
*
@return
{
String
} mode of operation for the exception
*/
mode
:
function
(
e
)
{
if
(
e
[
'arguments'
]
&&
e
.
stack
)
{
return
'chrome'
;
}
else
if
(
e
.
stack
&&
e
.
sourceURL
)
{
return
'safari'
;
}
else
if
(
e
.
stack
&&
e
.
number
)
{
return
'ie'
;
}
else
if
(
typeof
e
.
message
===
'string'
&&
typeof
window
!==
'undefined'
&&
window
.
opera
)
{
// e.message.indexOf("Backtrace:") > -1 -> opera
// !e.stacktrace -> opera
if
(
!
e
.
stacktrace
)
{
return
'opera9'
;
// use e.message
}
// 'opera#sourceloc' in e -> opera9, opera10a
if
(
e
.
message
.
indexOf
(
'\n'
)
>
-
1
&&
e
.
message
.
split
(
'\n'
)
.
length
>
e
.
stacktrace
.
split
(
'\n'
)
.
length
)
{
return
'opera9'
;
// use e.message
}
// e.stacktrace && !e.stack -> opera10a
if
(
!
e
.
stack
)
{
return
'opera10a'
;
// use e.stacktrace
}
// e.stacktrace && e.stack -> opera10b
if
(
e
.
stacktrace
.
indexOf
(
"called from line"
)
<
0
)
{
return
'opera10b'
;
// use e.stacktrace, format differs from 'opera10a'
}
// e.stacktrace && e.stack -> opera11
return
'opera11'
;
// use e.stacktrace, format differs from 'opera10a', 'opera10b'
}
else
if
(
e
.
stack
)
{
return
'firefox'
;
}
return
'other'
;
}
,
/**
* Given a context, function name, and callback function, overwrite it so that it calls
* printStackTrace() first with a callback and then runs the rest of the body.
*
*
@param
{
Object
} context of execution (e.g. window)
*
@param
{
String
} functionName to instrument
*
@param
{
Function
} function to call with a stack trace on invocation
*/
instrumentFunction
:
function
(
context
,
functionName
,
callback
)
{
context
=
context
||
window
;
var
original
=
context
[
functionName
]
;
context
[
functionName
]
=
function
instrumented
(
)
{
callback
.
call
(
this
,
printStackTrace
(
)
.
slice
(
4
)
)
;
return
context
[
functionName
]
.
_instrumented
.
apply
(
this
,
arguments
)
;
}
;
context
[
functionName
]
.
_instrumented
=
original
;
}
,
/**
* Given a context and function name of a function that has been
* instrumented, revert the function to it's original (non-instrumented)
* state.
*
*
@param
{
Object
} context of execution (e.g. window)
*
@param
{
String
} functionName to de-instrument
*/
deinstrumentFunction
:
function
(
context
,
functionName
)
{
if
(
context
[
functionName
]
.
constructor
===
Function
&&
context
[
functionName
]
.
_instrumented
&&
context
[
functionName
]
.
_instrumented
.
constructor
===
Function
)
{
context
[
functionName
]
=
context
[
functionName
]
.
_instrumented
;
}
}
,
/**
* Given an Error object, return a formatted Array based on Chrome's stack string.
*
*
@param
e - Error object to inspect
*
@return
Array<String> of function calls, files and line numbers
*/
chrome
:
function
(
e
)
{
var
stack
=
(
e
.
stack
+
'\n'
)
.
replace
(
/
^
\S
[
^
\(
]
+
?
[
\n
$
]
/
gm
,
''
)
.
replace
(
/
^
\s
+
(
a
t
e
v
a
l
)
?
a
t
\s
+
/
gm
,
''
)
.
replace
(
/
^
(
[
^
\(
]
+
?
)
(
[
\n
$
]
)
/
gm
,
'{anonymous}()@$1$2'
)
.
replace
(
/
^
O
b
j
e
c
t
.
<
a
n
o
n
y
m
o
u
s
>
\s
*
\(
(
[
^
\)
]
+
)
\)
/
gm
,
'{anonymous}()@$1'
)
.
split
(
'\n'
)
;
stack
.
pop
(
)
;
return
stack
;
}
,
/**
* Given an Error object, return a formatted Array based on Safari's stack string.
*
*
@param
e - Error object to inspect
*
@return
Array<String> of function calls, files and line numbers
*/
safari
:
function
(
e
)
{
return
e
.
stack
.
replace
(
/
\[
n
a
t
i
v
e
c
o
d
e
\]
\n
/
m
,
''
)
.
replace
(
/
^
(?
=
\w
+
E
r
r
o
r
\:
)
.
*
$
\n
/
m
,
''
)
.
replace
(
/
^
@
/
gm
,
'{anonymous}()@'
)
.
split
(
'\n'
)
;
}
,
/**
* Given an Error object, return a formatted Array based on IE's stack string.
*
*
@param
e - Error object to inspect
*
@return
Array<String> of function calls, files and line numbers
*/
ie
:
function
(
e
)
{
var
lineRE
=
/
^
.
*
a
t
(
\w
+
)
\(
(
[
^
\)
]
+
)
\)
$
/
gm
;
return
e
.
stack
.
replace
(
/
a
t
A
n
o
n
y
m
o
u
s
f
u
n
c
t
i
o
n
/
gm
,
'{anonymous}()@'
)
.
replace
(
/
^
(?
=
\w
+
E
r
r
o
r
\:
)
.
*
$
\n
/
m
,
''
)
.
replace
(
lineRE
,
'$1@$2'
)
.
split
(
'\n'
)
;
}
,
/**
* Given an Error object, return a formatted Array based on Firefox's stack string.
*
*
@param
e - Error object to inspect
*
@return
Array<String> of function calls, files and line numbers
*/
firefox
:
function
(
e
)
{
return
e
.
stack
.
replace
(
/
(?:
\n
@
:
0
)
?
\s
+
$
/
m
,
''
)
.
replace
(
/
^
[
\(
@
]
/
gm
,
'{anonymous}()@'
)
.
split
(
'\n'
)
;
}
,
opera11
:
function
(
e
)
{
var
ANON
=
'{anonymous}'
,
lineRE
=
/
^
.
*
l
i
n
e
(
\d
+
)
,
c
o
l
u
m
n
(
\d
+
)
(?:
i
n
(
.
+
)
)
?
i
n
(
\S
+
)
:
$
/
;
var
lines
=
e
.
stacktrace
.
split
(
'\n'
)
,
result
=
[
]
;
for
(
var
i
=
0
,
len
=
lines
.
length
;
i
<
len
;
i
+=
2
)
{
var
match
=
lineRE
.
exec
(
lines
[
i
]
)
;
if
(
match
)
{
var
location
=
match
[
4
]
+
':'
+
match
[
1
]
+
':'
+
match
[
2
]
;
var
fnName
=
match
[
3
]
||
"global code"
;
fnName
=
fnName
.
replace
(
/
<
a
n
o
n
y
m
o
u
s
f
u
n
c
t
i
o
n
:
(
\S
+
)
>
/
,
"$1"
)
.
replace
(
/
<
a
n
o
n
y
m
o
u
s
f
u
n
c
t
i
o
n
>
/
,
ANON
)
;
result
.
push
(
fnName
+
'@'
+
location
+
' -- '
+
lines
[
i
+
1
]
.
replace
(
/
^
\s
+
/
,
''
)
)
;
}
}
return
result
;
}
,
opera10b
:
function
(
e
)
{
// "<anonymous function: run>([arguments not available])@file://localhost/G:/js/stacktrace.js:27\n" +
// "printStackTrace([arguments not available])@file://localhost/G:/js/stacktrace.js:18\n" +
// "@file://localhost/G:/js/test/functional/testcase1.html:15"
var
lineRE
=
/
^
(
.
*
)
@
(
.
+
)
:
(
\d
+
)
$
/
;
var
lines
=
e
.
stacktrace
.
split
(
'\n'
)
,
result
=
[
]
;
for
(
var
i
=
0
,
len
=
lines
.
length
;
i
<
len
;
i
++
)
{
var
match
=
lineRE
.
exec
(
lines
[
i
]
)
;
if
(
match
)
{
var
fnName
=
match
[
1
]
?
(
match
[
1
]
+
'()'
)
:
"global code"
;
result
.
push
(
fnName
+
'@'
+
match
[
2
]
+
':'
+
match
[
3
]
)
;
}
}
return
result
;
}
,
/**
* Given an Error object, return a formatted Array based on Opera 10's stacktrace string.
*
*
@param
e - Error object to inspect
*
@return
Array<String> of function calls, files and line numbers
*/
opera10a
:
function
(
e
)
{
// " Line 27 of linked script file://localhost/G:/js/stacktrace.js\n"
// " Line 11 of inline#1 script in file://localhost/G:/js/test/functional/testcase1.html: In function foo\n"
var
ANON
=
'{anonymous}'
,
lineRE
=
/
L
i
n
e
(
\d
+
)
.
*
s
c
r
i
p
t
(?:
i
n
)
?
(
\S
+
)
(?:
:
I
n
f
u
n
c
t
i
o
n
(
\S
+
)
)
?
$
/
i
;
var
lines
=
e
.
stacktrace
.
split
(
'\n'
)
,
result
=
[
]
;
for
(
var
i
=
0
,
len
=
lines
.
length
;
i
<
len
;
i
+=
2
)
{
var
match
=
lineRE
.
exec
(
lines
[
i
]
)
;
if
(
match
)
{
var
fnName
=
match
[
3
]
||
ANON
;
result
.
push
(
fnName
+
'()@'
+
match
[
2
]
+
':'
+
match
[
1
]
+
' -- '
+
lines
[
i
+
1
]
.
replace
(
/
^
\s
+
/
,
''
)
)
;
}
}
return
result
;
}
,
// Opera 7.x-9.2x only!
opera9
:
function
(
e
)
{
// " Line 43 of linked script file://localhost/G:/js/stacktrace.js\n"
// " Line 7 of inline#1 script in file://localhost/G:/js/test/functional/testcase1.html\n"
var
ANON
=
'{anonymous}'
,
lineRE
=
/
L
i
n
e
(
\d
+
)
.
*
s
c
r
i
p
t
(?:
i
n
)
?
(
\S
+
)
/
i
;
var
lines
=
e
.
message
.
split
(
'\n'
)
,
result
=
[
]
;
for
(
var
i
=
2
,
len
=
lines
.
length
;
i
<
len
;
i
+=
2
)
{
var
match
=
lineRE
.
exec
(
lines
[
i
]
)
;
if
(
match
)
{
result
.
push
(
ANON
+
'()@'
+
match
[
2
]
+
':'
+
match
[
1
]
+
' -- '
+
lines
[
i
+
1
]
.
replace
(
/
^
\s
+
/
,
''
)
)
;
}
}
return
result
;
}
,
// Safari 5-, IE 9-, and others
other
:
function
(
curr
)
{
var
ANON
=
'{anonymous}'
,
fnRE
=
/
f
u
n
c
t
i
o
n
\s
*
(
[
\w
\-
$
]
+
)
?
\s
*
\(
/
i
,
stack
=
[
]
,
fn
,
args
,
maxStackSize
=
10
;
while
(
curr
&&
curr
[
'arguments'
]
&&
stack
.
length
<
maxStackSize
)
{
fn
=
fnRE
.
test
(
curr
.
toString
(
)
)
?
RegExp
.
$1
||
ANON
:
ANON
;
args
=
Array
.
prototype
.
slice
.
call
(
curr
[
'arguments'
]
||
[
]
)
;
stack
[
stack
.
length
]
=
fn
+
'('
+
this
.
stringifyArguments
(
args
)
+
')'
;
curr
=
curr
.
caller
;
}
return
stack
;
}
,
/**
* Given arguments array as a String, subsituting type names for non-string types.
*
*
@param
{
Arguments
} args
*
@return
{
Array
} of Strings with stringified arguments
*/
stringifyArguments
:
function
(
args
)
{
var
result
=
[
]
;
var
slice
=
Array
.
prototype
.
slice
;
for
(
var
i
=
0
;
i
<
args
.
length
;
++
i
)
{
var
arg
=
args
[
i
]
;
if
(
arg
===
undefined
)
{
result
[
i
]
=
'undefined'
;
}
else
if
(
arg
===
null
)
{
result
[
i
]
=
'null'
;
}
else
if
(
arg
.
constructor
)
{
if
(
arg
.
constructor
===
Array
)
{
if
(
arg
.
length
<
3
)
{
result
[
i
]
=
'['
+
this
.
stringifyArguments
(
arg
)
+
']'
;
}
else
{
result
[
i
]
=
'['
+
this
.
stringifyArguments
(
slice
.
call
(
arg
,
0
,
1
)
)
+
'...'
+
this
.
stringifyArguments
(
slice
.
call
(
arg
,
-
1
)
)
+
']'
;
}
}
else
if
(
arg
.
constructor
===
Object
)
{
result
[
i
]
=
'#object'
;
}
else
if
(
arg
.
constructor
===
Function
)
{
result
[
i
]
=
'#function'
;
}
else
if
(
arg
.
constructor
===
String
)
{
result
[
i
]
=
'"'
+
arg
+
'"'
;
}
else
if
(
arg
.
constructor
===
Number
)
{
result
[
i
]
=
arg
;
}
}
}
return
result
.
join
(
','
)
;
}
,
sourceCache
:
{
}
,
/**
*
@return
the text from a given URL
*/
ajax
:
function
(
url
)
{
var
req
=
this
.
createXMLHTTPObject
(
)
;
if
(
req
)
{
try
{
req
.
open
(
'GET'
,
url
,
false
)
;
//req.overrideMimeType('text/plain');
//req.overrideMimeType('text/javascript');
req
.
send
(
null
)
;
//return req.status == 200 ? req.responseText : '';
return
req
.
responseText
;
}
catch
(
e
)
{
}
}
return
''
;
}
,
/**
* Try XHR methods in order and store XHR factory.
*
*
@return
<Function> XHR function or equivalent
*/
createXMLHTTPObject
:
function
(
)
{
var
xmlhttp
,
XMLHttpFactories
=
[
function
(
)
{
return
new
XMLHttpRequest
(
)
;
}
,
function
(
)
{
return
new
ActiveXObject
(
'Msxml2.XMLHTTP'
)
;
}
,
function
(
)
{
return
new
ActiveXObject
(
'Msxml3.XMLHTTP'
)
;
}
,
function
(
)
{
return
new
ActiveXObject
(
'Microsoft.XMLHTTP'
)
;
}
]
;
for
(
var
i
=
0
;
i
<
XMLHttpFactories
.
length
;
i
++
)
{
try
{
xmlhttp
=
XMLHttpFactories
[
i
]
(
)
;
// Use memoization to cache the factory
this
.
createXMLHTTPObject
=
XMLHttpFactories
[
i
]
;
return
xmlhttp
;
}
catch
(
e
)
{
}
}
}
,
/**
* Given a URL, check if it is in the same domain (so we can get the source
* via Ajax).
*
*
@param
url <String> source url
*
@return
False if we need a cross-domain request
*/
isSameDomain
:
function
(
url
)
{
return
typeof
location
!==
"undefined"
&&
url
.
indexOf
(
location
.
hostname
)
!==
-
1
;
// location may not be defined, e.g. when running from nodejs.
}
,
/**
* Get source code from given URL if in the same domain.
*
*
@param
url <String> JS source URL
*
@return
<Array> Array of source code lines
*/
getSource
:
function
(
url
)
{
// TODO reuse source from script tags?
if
(
!
(
url
in
this
.
sourceCache
)
)
{
this
.
sourceCache
[
url
]
=
this
.
ajax
(
url
)
.
split
(
'\n'
)
;
}
return
this
.
sourceCache
[
url
]
;
}
,
guessAnonymousFunctions
:
function
(
stack
)
{
for
(
var
i
=
0
;
i
<
stack
.
length
;
++
i
)
{
var
reStack
=
/
\{
a
n
o
n
y
m
o
u
s
\}
\(
.
*
\)
@
(
.
*
)
/
,
reRef
=
/
^
(
.
*
?
)
(?:
:
(
\d
+
)
)
(?:
:
(
\d
+
)
)
?
(?:
-
-
.
+
)
?
$
/
,
frame
=
stack
[
i
]
,
ref
=
reStack
.
exec
(
frame
)
;
if
(
ref
)
{
var
m
=
reRef
.
exec
(
ref
[
1
]
)
;
if
(
m
)
{
// If falsey, we did not get any file/line information
var
file
=
m
[
1
]
,
lineno
=
m
[
2
]
,
charno
=
m
[
3
]
||
0
;
if
(
file
&&
this
.
isSameDomain
(
file
)
&&
lineno
)
{
var
functionName
=
this
.
guessAnonymousFunction
(
file
,
lineno
,
charno
)
;
stack
[
i
]
=
frame
.
replace
(
'{anonymous}'
,
functionName
)
;
}
}
}
}
return
stack
;
}
,
guessAnonymousFunction
:
function
(
url
,
lineNo
,
charNo
)
{
var
ret
;
try
{
ret
=
this
.
findFunctionName
(
this
.
getSource
(
url
)
,
lineNo
)
;
}
catch
(
e
)
{
ret
=
'getSource failed with url: '
+
url
+
', exception: '
+
e
.
toString
(
)
;
}
return
ret
;
}
,
findFunctionName
:
function
(
source
,
lineNo
)
{
// FIXME findFunctionName fails for compressed source
// (more than one function on the same line)
// function {name}({args}) m[1]=name m[2]=args
var
reFunctionDeclaration
=
/
f
u
n
c
t
i
o
n
\s
+
(
[
^
(
]
*
?
)
\s
*
\(
(
[
^
)
]
*
)
\)
/
;
// {name} = function ({args}) TODO args capture
// /['"]?([0-9A-Za-z_]+)['"]?\s*[:=]\s*function(?:[^(]*)/
var
reFunctionExpression
=
/
[
'
"
]
?
(
[
$
_
A
-
Z
a
-
z
]
[
$
_
A
-
Z
a
-
z
0
-
9
]
*
)
[
'
"
]
?
\s
*
[:
=
]
\s
*
f
u
n
c
t
i
o
n
\b
/
;
// {name} = eval()
var
reFunctionEvaluation
=
/
[
'
"
]
?
(
[
$
_
A
-
Z
a
-
z
]
[
$
_
A
-
Z
a
-
z
0
-
9
]
*
)
[
'
"
]
?
\s
*
[:
=
]
\s
*
(?:
e
v
a
l
|
n
e
w
F
u
n
c
t
i
o
n
)
\b
/
;
// Walk backwards in the source lines until we find
// the line which matches one of the patterns above
var
code
=
""
,
line
,
maxLines
=
Math
.
min
(
lineNo
,
20
)
,
m
,
commentPos
;
for
(
var
i
=
0
;
i
<
maxLines
;
++
i
)
{
// lineNo is 1-based, source[] is 0-based
line
=
source
[
lineNo
-
i
-
1
]
;
commentPos
=
line
.
indexOf
(
'//'
)
;
if
(
commentPos
>=
0
)
{
line
=
line
.
substr
(
0
,
commentPos
)
;
}
// TODO check other types of comments? Commented code may lead to false positive
if
(
line
)
{
code
=
line
+
code
;
m
=
reFunctionExpression
.
exec
(
code
)
;
if
(
m
&&
m
[
1
]
)
{
return
m
[
1
]
;
}
m
=
reFunctionDeclaration
.
exec
(
code
)
;
if
(
m
&&
m
[
1
]
)
{
//return m[1] + "(" + (m[2] || "") + ")";
return
m
[
1
]
;
}
m
=
reFunctionEvaluation
.
exec
(
code
)
;
if
(
m
&&
m
[
1
]
)
{
return
m
[
1
]
;
}
}
}
return
'(?)'
;
}
}
;
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