On Mar 7, 2015, at 6:34 AM, Diederik Meijer <diede...@tenhorses.com> wrote:
>> On 07 Mar 2015, at 12:36, Ken Thomases <k...@codeweavers.com> wrote:
>>
>>> On Mar 7, 2015, at 5:02 AM, Diederik Meijer <diede...@tenhorses.com> wrote:
>>>
>>> This is part of XML parsing with NSXMLParser, is there any way to avoid
>>> this type of staircasing by constructing a keyPath dynamically?
>>>
>>> if (self.nestingLevel == 1) { [[[self.rootparser nodeTree]
>>> lastObject][@"items"] addObject:dict]; }
>>> if (self.nestingLevel == 2) { [[[[self.rootparser nodeTree]
>>> lastObject][@"items"] lastObject][@"items"] addObject:dict]; }
>>> if (self.nestingLevel == 3) { [[[[[self.rootparser nodeTree]
>>> lastObject][@"items"] lastObject][@"items"] lastObject][@"items"]
>>> addObject:dict]; }
>>> if (self.nestingLevel == 4) { [[[[[[self.rootparser nodeTree]
>>> lastObject][@"items"] lastObject][@"items"] lastObject][@"items"]
>>> lastObject][@"items"] addObject:dict]; }
>>>
>>> As you can see the action is always the same: addObject:dict
>>>
>>> But depending on the level of nesting, lastObject][@"items”] needs to be
>>> added multiple times to the self.rootparser’s nodeTree property.
>>>
>>> Is there any way to use a loop that runs for self.nestingLevel times and
>>> adds the extra levels to the keyPath just as many times as needed and then
>>> use that to access the noteTree at the exact right level?
>>
>> No. Key paths can't index into arrays. However, you can just use a simply
>> for loop. Something like:
>>
>> NSMutableArray* array = [[self.rootparser nodeTree] lastObject][@"items"];
>> for (int i = 1; i < self.nestingLevel; i++)
>> array = array.lastObject[@"items"];
>> [array addObject:dict];
>
>
> Thanks Ken, but this does not seem to traverse down into n nested levels,
> correct?
It does traverse down. It's just like your code, except generalized.
> The loop goes through the nodeTree's first level children only (pardon the
> bad semantics here)
Each time through the loop, it reassigns the "array" variable. So, the next
time through the loop, it's accessing a deeper level of the tree.
Regards,
Ken
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