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pkp: po alternative to lookup via valueForKeyPath: #53

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Merged
kastiglione merged 4 commits into from
Nov 25, 2014
Merged

pkp: po alternative to lookup via valueForKeyPath: #53

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ce3dc97
Initial version of pkp, a command to print out via keypaths
Nov 20, 2014
5ccee16
Add an error message, made class invocation more durable.
Nov 20, 2014
72adcb4
Fix help message, clean up python.
Nov 21, 2014
bea8bee
If there's no '.', just pass the command to po, and evaluate the firs…
Nov 22, 2014
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22 changes: 22 additions & 0 deletions commands/FBPrintCommands.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@ def lldbcommands():
FBPrintOnscreenTableViewCells(),
FBPrintInternals(),
FBPrintInstanceVariable(),
FBPrintKeyPath(),
]

class FBPrintViewHierarchyCommand(fb.FBCommand):
Expand Down Expand Up @@ -272,3 +273,24 @@ def run(self, arguments, options):

printCommand = 'po' if ('@' in ivarTypeEncodingFirstChar) else 'p'
lldb.debugger.HandleCommand('{} (({} *)({}))->{}'.format(printCommand, objectClass, object, ivarName))

class FBPrintKeyPath(fb.FBCommand):
def name(self):
return 'pkp'

def description(self):
return "Print out the value of the key path expression using -valueForKeyPath:"

def args(self):
return [
fb.FBCommandArgument(arg='keypath', type='NSString *', help='The keypath to print'),
]

def run(self, arguments, options):
if len(arguments[0].split('.')) == 1:
print '"' + arguments[0] + '" is not a keypath =('
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@kastiglione kastiglione Nov 21, 2014

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What do you think about treating this case as equal to po? That way, we can all type pkp except when evaluating something fancy.

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@KingOfBrian KingOfBrian Nov 21, 2014

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It's an interesting idea, to add durable-ness, but I think it'd need a lot more checks than the presence of a '.' to be worth implementing. IE, [UIApplication sharedApplication].keyWindow would still blow up. I'd rather blow up in all slightly-wrong scenarios just keep clarity of intent.

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@kastiglione kastiglione Nov 22, 2014

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See my other comment. Personally, while debugging, I'd rather make things as convenient as possible :)

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@KingOfBrian KingOfBrian Nov 22, 2014

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Yea, looking at it again, I totally agree.

return

object, keypath = arguments[0].split('.', 1)
printCommand = 'po [{} valueForKeyPath:@"{}"]'.format(object, keypath)
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@kastiglione kastiglione Nov 22, 2014

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In a previous commit you had it evaluating object as an expression, before evaluating the -valueForKeyPath:. How come you removed that? It seems useful because it could allow:

pkp [someObject methodTaking:1 and:2].foo.bar.whatever

lldb.debugger.HandleCommand(printCommand)