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|
Directives: Error Handling
==========================
#try and #raise
---------------
The template:
::
#import traceback
#try
#raise RuntimeError
#except RuntimeError
A runtime error occurred.
#end try
#try
#raise RuntimeError("Hahaha!")
#except RuntimeError
#echo $sys.exc_info()[1]
#end try
#try
#echo 1/0
#except ZeroDivisionError
You can't divide by zero, idiot!
#end try
The output:
::
A runtime error occurred.
Hahaha!
You can't divide by zero, idiot!
The generated code:
::
try:
raise RuntimeError
except RuntimeError:
write('A runtime error occurred.\n')
write('\n')
try:
raise RuntimeError("Hahaha!")
except RuntimeError:
write(filter(VFN(sys,"exc_info",0)()[1]))
write('\n')
write('\n')
try:
write(filter(1/0))
write('\n')
except ZeroDivisionError:
write("You can't divide by zero, idiot!\n")
{#finally} works just like in Python.
#assert
-------
The template:
::
#assert False, "You lose, buster!"
The output:
::
Traceback (most recent call last):
File "x.py", line 117, in ?
x().runAsMainProgram()
File "/local/opt/Python/lib/python2.2/site-packages/Webware/Cheetah/
Template.py", line 331, in runAsMainProgram
CmdLineIface(templateObj=self).run()
File "/local/opt/Python/lib/python2.2/site-packages/Webware/Cheetah/
TemplateCmdLineIface.py", line 59, in run
print self._template
File "x.py", line 91, in respond
assert False, "You lose, buster!"
AssertionError: You lose, buster!
The generated code:
::
assert False, "You lose, buster!"
#errorCatcher
-------------
No error catcher
~~~~~~~~~~~~~~~~
The template:
::
$noValue
The output:
::
Traceback (most recent call last):
File "x.py", line 118, in ?
x().runAsMainProgram()
File "/local/opt/Python/lib/python2.2/site-packages/Webware/Cheetah/
Template.py", line 331, in runAsMainProgram
CmdLineIface(templateObj=self).run()
File "/local/opt/Python/lib/python2.2/site-packages/Webware/Cheetah/
TemplateCmdLineIface.py", line 59, in run
print self._template
File "x.py", line 91, in respond
write(filter(VFS(SL,"noValue",1))) # generated from '$noValue' at line
1, col 1.
NameMapper.NotFound: noValue
The generated code:
::
write(filter(VFS(SL,"noValue",1))) # generated from '$noValue' at line 1,
# col 1.
write('\n')
Echo and BigEcho
~~~~~~~~~~~~~~~~
The template:
::
#errorCatcher Echo
$noValue
#errorCatcher BigEcho
$noValue
The output:
::
$noValue
===============<$noValue could not be found>===============
The generated code:
::
if "Echo" in self._errorCatchers:
self._errorCatcher = self._errorCatchers["Echo"]
else:
self._errorCatcher = self._errorCatchers["Echo"] = ErrorCatchers.Echo(self)
write(filter(self.__errorCatcher1(localsDict=locals())))
# generated from '$noValue' at line 2, col 1.
write('\n')
if "BigEcho" in self._errorCatchers:
self._errorCatcher = self._errorCatchers["BigEcho"]
else:
self._errorCatcher = self._errorCatchers["BigEcho"] = \
ErrorCatchers.BigEcho(self)
write(filter(self.__errorCatcher1(localsDict=locals())))
# generated from '$noValue' at line 4, col 1.
write('\n')
ListErrors
~~~~~~~~~~
The template:
::
#import pprint
#errorCatcher ListErrors
$noValue
$anotherMissingValue.really
$pprint.pformat($errorCatcher.listErrors)
## This is really self.errorCatcher().listErrors()
The output:
::
$noValue
$anotherMissingValue.really
[{'code': 'VFS(SL,"noValue",1)',
'exc_val': <NameMapper.NotFound instance at 0x8170ecc>,
'lineCol': (3, 1),
'rawCode': '$noValue',
'time': 'Wed May 15 00:38:23 2002'},
{'code': 'VFS(SL,"anotherMissingValue.really",1)',
'exc_val': <NameMapper.NotFound instance at 0x816d0fc>,
'lineCol': (4, 1),
'rawCode': '$anotherMissingValue.really',
'time': 'Wed May 15 00:38:23 2002'}]
The generated import:
::
import pprint
Then in the generated class, we have our familiar {.respond} method
and several new methods:
::
def __errorCatcher1(self, localsDict={}):
"""
Generated from $noValue at line, col (3, 1).
"""
try:
return eval('''VFS(SL,"noValue",1)''', globals(), localsDict)
except self._errorCatcher.exceptions(), e:
return self._errorCatcher.warn(exc_val=e, code= 'VFS(SL,"noValue",1)' ,
rawCode= '$noValue' , lineCol=(3, 1))
def __errorCatcher2(self, localsDict={}):
"""
Generated from $anotherMissingValue.really at line, col (4, 1).
"""
try:
return eval('''VFS(SL,"anotherMissingValue.really",1)''', globals(),
localsDict)
except self._errorCatcher.exceptions(), e:
return self._errorCatcher.warn(exc_val=e,
code= 'VFS(SL,"anotherMissingValue.really",1)' ,
rawCode= '$anotherMissingValue.really' , lineCol=(4, 1))
def __errorCatcher3(self, localsDict={}):
"""
Generated from $pprint.pformat($errorCatcher.listErrors) at line, col
(5, 1).
"""
try:
return eval('''VFN(pprint,"pformat",0)(VFS(SL,
"errorCatcher.listErrors",1))''', globals(), localsDict)
except self._errorCatcher.exceptions(), e:
return self._errorCatcher.warn(exc_val=e, code=
'VFN(pprint,"pformat",0)(VFS(SL,"errorCatcher.listErrors",1))' ,
rawCode= '$pprint.pformat($errorCatcher.listErrors)' ,
lineCol=(5, 1))
::
def respond(self,
trans=None,
dummyTrans=False,
VFS=valueFromSearchList,
VFN=valueForName,
getmtime=getmtime,
currentTime=time.time):
"""
This is the main method generated by Cheetah
"""
if not trans:
trans = DummyTransaction()
dummyTrans = True
write = trans.response().write
SL = self._searchList
filter = self._currentFilter
globalSetVars = self._globalSetVars
########################################
## START - generated method body
if exists(self._filePath) and getmtime(self._filePath) > self._fileMtime:
self.compile(file=self._filePath)
write(getattr(self, self._mainCheetahMethod_for_x)(trans=trans))
if dummyTrans:
return trans.response().getvalue()
else:
return ""
if "ListErrors" in self._errorCatchers:
self._errorCatcher = self._errorCatchers["ListErrors"]
else:
self._errorCatcher = self._errorCatchers["ListErrors"] = \
ErrorCatchers.ListErrors(self)
write(filter(self.__errorCatcher1(localsDict=locals())))
# generated from '$noValue' at line 3, col 1.
write('\n')
write(filter(self.__errorCatcher2(localsDict=locals())))
# generated from '$anotherMissingValue.really' at line 4, col 1.
write('\n')
write(filter(self.__errorCatcher3(localsDict=locals())))
# generated from '$pprint.pformat($errorCatcher.listErrors)' at line
# 5, col 1.
write('\n')
# This is really self.errorCatcher().listErrors()
########################################
## END - generated method body
if dummyTrans:
return trans.response().getvalue()
else:
return ""
So whenever an error catcher is active, each placeholder gets
wrapped in its own method. No wonder error catchers slow down the
system!
|
