logos

logos copied to clipboard

When hooking a method which accepts a block as a paramter, Logos dislikes this form of calling the original implementation:

%hook AwesomeClass

- (void)AwesomeMethod:(void (^)(void))awesomeBlock
{
    %orig(^{
        NSLog(@"Hello");
    }); 
}

%end

However, this works:

%hook AwesomeClass

- (void)AwesomeMethod:(void (^)(void))awesomeBlock
{
    %orig(^{ NSLog(@"Hello"); }); 
}

%end

and putting the block in a variable, works too, obviously.

Logos errors out with this error: "error: missing closing parenthesis"

Attempt to declare the block separately and then pass the block to %orig. I think that should work with Logos as-is and this is quite an interesting issue!

Yes, that works, as I originally mentioned "and putting the block in a variable, works too, obviously".

Unfortunately, this is a known (and difficult to fix properly) issue. Logos is a somewhat degenerate parser - regex-based, non-tokenizing, and without a lexical understanding.

I think this is related: by having a comment with //* it gives a %hook does not make sense inside a block later in the code.