Nasty filter bug

[Craig Newman]

OK, instead of working I did this:

on mouseUp

repeat with y = 1 to 255

put "XX" & numToChar(y) & "XX"  into temp

filter temp without temp

if temp <> "" then put y & return after accum

end repeat

answer accum

end mouseUp

There are two characters that prevent the filter command from doing its job: ASCII 91 (“[“) and ASCII 10, the return char.



Craig


> On Jan 24, 2024, at 12:51 PM, Craig Newman via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> Brian.
> 
> Nope. Those two chars pass through the filter, er, filtered.
> 
> Again, I did not test the entire character set.
> 
> Craig
> 
>> On Jan 24, 2024, at 11:05 AM, Brian Milby via use-livecode <use-livecode at lists.runrev.com> wrote:
>> 
>> The only other two that would cause issues are ? and * which are single and multiple char wildcards respectively.
>> 
>> Brian Milby
>> brian at milby7.com
>> 
>>> On Jan 24, 2024, at 10:21 AM, Craig Newman via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> 
>>> I did not test the ASCII set exhaustively, but the culprit is the char “[“ (ASCII 91). Any other char (including “]”) in the string works correctly, that is, nothing is left after the filter command executes.
>>> 
>>> I do not know enough to say whether that particular char  does something to the filter command, which may use regex somehow in its inner workings.
>>> 
>>> Craig
>>> 
>>> Craig
>>> 
>>>> On Jan 23, 2024, at 9:45 PM, Brian Milby via use-livecode <use-livecode at lists.runrev.com> wrote:
>>>> 
>>>> Not sure this is really a bug.  The default is to match a wildcardPattern.  If you want to match [ then you must use [[] in the pattern.
>>>> 
>>>> Brian Milby
>>>> brian at milby7.com
>>>> 
>>>>>> On Jan 23, 2024, at 9:02 PM, Neville Smythe via use-livecode <use-livecode at lists.runrev.com> wrote:
>>>>> 
>>>>> Try this in the msg box:
>>>>> 
>>>>> put "aaa[bbb" into tStr; put line 1 of tStr into tLine; filter tStr without tLine; put tStr
>>>>> I get (using MacOS, LC 9.6.11)
>>>>> 
>>>>> aaa[bbb
>>>>> 
>>>>> That is to say, the line is not filtered out.
>>>>> 
>>>>> And:
>>>>> 
>>>>> put "aaa[bbb" into tStr; filter tStr with tStr; put tStr
>>>>> 
>>>>> produces an empty string instead of the original string.
>>>>> 
>>>>> The bug occurs if the line contains the character “[“ anywhere; any lines containing that character are ignored by both filter with and filter without.
>>>>> 
>>>>> This is really serious, because I rely on the filter command a lot, as I would think do many other developers!
>>>>> 
>>>>> Don’t know if it occurs with other characters, but I have never seen it before. I discovered it when filtering lines with regular expressions. Other special regexp characters I have tested do not trigger the bug.
>>>>> 
>>>>> Neville Smythe
>>>>> 
>>>>> 
>>>>> 
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