hi there, i have a question about squeak object model.
how can i check whether a method contains a certain piece of code? i.e if the method "isKindOf:" has the code "class inheritsFrom" - return true, otherwise - return false (in this case, isKindOf indeed has that code, so i expect to get true).
obviously if i know the class+method, than i can check the code in the Browser, but how can i perform this check at runtime when the class+methods are given as an input?
if the class is represented as aClass, the method is represented as aMethod, and the code to check is: 'check if this code exist', than i guess the start would be:
checkClass: aClass andMethod: aMethod aClass respondsTo: aMethod ifTrue: [ ^ hmmmmm hasCode: 'check if this code exist' ] ifFalse: [ ^ false ]
but what should i actually check in the ifTrue block? i need to be able to check this by code, and not with the refactoring browser.
sorry for the (very) long question. thanks, dvir.
If what you want is to see the source for a methods and compare that source to something, then
aClass sourceCodeAt: aMethod "aMethod is assumed to be a Symbol here, so aSymbol or aSelector might be a better name"
will do what you want.
E.g.
Array sourceCodeAt: #printOn:
will give you:
a Text for 'printOn: aStream self shouldBePrintedAsLiteral ifTrue: [^self printAsLiteralFormOn: aStream]. self class = Array ifTrue: [^self printAsBraceFormOn: aStream]. ^super printOn: aStream'
Cheers, Bob
On 4/28/13 4:55 PM, Dvir Faivel wrote:
hi there, i have a question about squeak object model.
how can i check whether a method contains a certain piece of code? i.e if the method "isKindOf:" has the code "class inheritsFrom" - return true, otherwise - return false (in this case, isKindOf indeed has that code, so i expect to get true).
obviously if i know the class+method, than i can check the code in the Browser, but how can i perform this check at runtime when the class+methods are given as an input?
if the class is represented as aClass, the method is represented as aMethod, and the code to check is: 'check if this code exist', than i guess the start would be:
checkClass: aClass andMethod: aMethod aClass respondsTo: aMethod ifTrue: [ ^ hmmmmm hasCode: 'check if this code exist' ] ifFalse: [ ^ false ]
but what should i actually check in the ifTrue block? i need to be able to check this by code, and not with the refactoring browser.
sorry for the (very) long question. thanks, dvir.
On 28-04-2013, at 1:55 PM, Dvir Faivel sdvirf@t2.technion.ac.il wrote:
hi there, i have a question about squeak object model.
how can i check whether a method contains a certain piece of code?
You'll get better advice if you expand upon what you want & why; what is the real problem you are trying to solve here?
If, for example you're simply wanting to programatically find all senders of a particular message then the code is already there - take a look at SystemNavigation>allCallsOn:fromBehaviors:sorted: to see how to scan all the methods implemented by a list of behaviours (ie classes or metaclasses) for sends of a particular message, including ones that are special cases. If you already know which class and method you want to look at then examine Behavior>whichSelectorsReferTo:specialByte:thorough: to see how the system does it.
Or are you wanting to look for particular fragments of code with some sort of text based pattern matching? Or…?
tim -- tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim ASCII to ASCII, DOS to DOS.
T hanks Bob! the example helped a lot.
Tim, i want to change the behavior of some methods (at runtime, based on the user's decision). for example, if a method of class A contains the comment: "hello, this is a comment" than if B inherits from A, this method wouldn't be inherited (an attempt to call this method from an object of type B would cause an exception to be thrown). the reason i'm using a comment is that it doesn't affect the code.
is there a simple way to add a code to a method? for example, to add "this is a comment" to the end of the code?
On Mon, Apr 29, 2013 at 2:46 AM, tim Rowledge tim@rowledge.org wrote:
On 28-04-2013, at 1:55 PM, Dvir Faivel sdvirf@t2.technion.ac.il wrote:
hi there, i have a question about squeak object model.
how can i check whether a method contains a certain piece of code?
You'll get better advice if you expand upon what you want & why; what is the real problem you are trying to solve here?
If, for example you're simply wanting to programatically find all senders of a particular message then the code is already there - take a look at SystemNavigation>allCallsOn:fromBehaviors:sorted: to see how to scan all the methods implemented by a list of behaviours (ie classes or metaclasses) for sends of a particular message, including ones that are special cases. If you already know which class and method you want to look at then examine Behavior>whichSelectorsReferTo:specialByte:thorough: to see how the system does it.
Or are you wanting to look for particular fragments of code with some sort of text based pattern matching? Or…?
tim
tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim ASCII to ASCII, DOS to DOS.
This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses.
aClass compile: (aClass sourceCodeAt: aMethod) string,' "** this is a comment**"'
Cheers, Bob
On 4/29/13 4:03 PM, Dvir Faivel wrote:
T hanks Bob! the example helped a lot.
Tim, i want to change the behavior of some methods (at runtime, based on the user's decision). for example, if a method of class A contains the comment: "hello, this is a comment" than if B inherits from A, this method wouldn't be inherited (an attempt to call this method from an object of type B would cause an exception to be thrown). the reason i'm using a comment is that it doesn't affect the code.
is there a simple way to add a code to a method? for example, to add "this is a comment" to the end of the code?
On Mon, Apr 29, 2013 at 2:46 AM, tim Rowledge <tim@rowledge.org mailto:tim@rowledge.org> wrote:
On 28-04-2013, at 1:55 PM, Dvir Faivel <sdvirf@t2.technion.ac.il <mailto:sdvirf@t2.technion.ac.il>> wrote: > hi there, > i have a question about squeak object model. > > how can i check whether a method contains a certain piece of code? You'll get better advice if you expand upon what you want & why; what is the real problem you are trying to solve here? If, for example you're simply wanting to programatically find all senders of a particular message then the code is already there - take a look at SystemNavigation>allCallsOn:fromBehaviors:sorted: to see how to scan all the methods implemented by a list of behaviours (ie classes or metaclasses) for sends of a particular message, including ones that are special cases. If you already know which class and method you want to look at then examine Behavior>whichSelectorsReferTo:specialByte:thorough: to see how the system does it. Or are you wanting to look for particular fragments of code with some sort of text based pattern matching? Or...? tim -- tim Rowledge; tim@rowledge.org <mailto:tim@rowledge.org>; http://www.rowledge.org/tim ASCII to ASCII, DOS to DOS. ************************************************************************************ This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses. ************************************************************************************
Thanks (again)!
On Mon, Apr 29, 2013 at 11:15 PM, Bob Arning arning315@comcast.net wrote:
aClass compile: (aClass sourceCodeAt: aMethod) string,' "** this is a comment**"'
Cheers, Bob
On 4/29/13 4:03 PM, Dvir Faivel wrote:
T hanks Bob! the example helped a lot.
Tim, i want to change the behavior of some methods (at runtime, based on the user's decision). for example, if a method of class A contains the comment: "hello, this is a comment" than if B inherits from A, this method wouldn't be inherited (an attempt to call this method from an object of type B would cause an exception to be thrown). the reason i'm using a comment is that it doesn't affect the code.
is there a simple way to add a code to a method? for example, to add "this is a comment" to the end of the code?
On Mon, Apr 29, 2013 at 2:46 AM, tim Rowledge tim@rowledge.org wrote:
On 28-04-2013, at 1:55 PM, Dvir Faivel sdvirf@t2.technion.ac.il wrote:
hi there, i have a question about squeak object model.
how can i check whether a method contains a certain piece of code?
You'll get better advice if you expand upon what you want & why; what is the real problem you are trying to solve here?
If, for example you're simply wanting to programatically find all senders of a particular message then the code is already there - take a look at SystemNavigation>allCallsOn:fromBehaviors:sorted: to see how to scan all the methods implemented by a list of behaviours (ie classes or metaclasses) for sends of a particular message, including ones that are special cases. If you already know which class and method you want to look at then examine Behavior>whichSelectorsReferTo:specialByte:thorough: to see how the system does it.
Or are you wanting to look for particular fragments of code with some sort of text based pattern matching? Or…?
tim
tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim ASCII to ASCII, DOS to DOS.
This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses.
This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses.
This footnote confirms that this email message has been scanned by PineApp Mail-SeCure for the presence of malicious code, vandals & computer viruses.
On 29-04-2013, at 1:03 PM, Dvir Faivel sdvirf@t2.technion.ac.il wrote:
Thanks Bob! the example helped a lot.
Tim, i want to change the behavior of some methods (at runtime, based on the user's decision). for example, if a method of class A contains the comment: "hello, this is a comment" than if B inherits from A, this method wouldn't be inherited (an attempt to call this method from an object of type B would cause an exception to be thrown). the reason i'm using a comment is that it doesn't affect the code.
is there a simple way to add a code to a method? for example, to add "this is a comment" to the end of the code?
It sounds to me as if you might be better off using a pragma; not that I'm any sort of expert on how pragmas are usable in current Squeak. We use a variety of pragmas in the VMMaker code to annotate methods for the C code generator; seems to me you are wanting something faintly similar.
Perhaps an even simpler approach might be to add a method in your class B with the same selector and implement it as self shouldNotDoThisException raise
tim -- tim Rowledge; tim@rowledge.org; http://www.rowledge.org/tim Ornerythologists study bad tempered birds
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