[Gambas-user] why this could not be? error in runtime?

[Tony Morehen]

It's difficult to say for sure what's happening without Piccaro's test 
strings.  However, 2 things do come to mind.

First, according to Gambas doc, InStr(strinchar, ")", -n) does a left to 
right search for ")", starting at -n  characters from the end of 
strinchar.  So if Instr doesn't find ")", it will return 0, which, in 
conjunction with the second -1, will cause mid to drop the last 
character of strinchar.  So to get the answer you want, use 
RInstr(strinchar,")"). which will do a right to left search for ")", 
starting at the end of strinchar.

Second, there may be a bug in gambas, or the documentation needs to make 
clear what end of string means.  This is best explained by example:

Instr("(foo)",")",-1) returns 5
Instr("(foo)f",")",-1) returns 5
Instr("(foo)ff",")",-1) returns 0

This means that Instr(s1,s2,-1) begins its search one character before 
the last character of the string.  So end of string actually means last 
character of the string and the docs should make that explicit or there 
is a bug if the intended meaning of end of string is the position after 
the last character of the string.


On 2017-07-28 09:31 PM, Fernando Cabral wrote:
> Piccoro, sorry for my previous information. Something was missing.
> In fact, both versions work the same:
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> *  strinchar = "test )after)r"    positionlen = (InStr(strinchar, ")", -1)
> - 1)    Print strinchar    Print positionlen    strinchar = Mid(strinchar,
> 1, positionlen)     Print strinchar    strinchar = "test )after)r"
> strinchar = Mid(strinchar, 1, (InStr(strinchar, ")", -1) - 1))    Print
> strinchar *
> Both print  "test )after"
>
> - fernando
>
> 2017-07-28 22:02 GMT-03:00 Adrien Prokopowicz <adrien.prokopowicz at ...626...>
> :
>
>> Le Sat, 29 Jul 2017 02:40:44 +0200, Jussi Lahtinen <
>> jussi.lahtinen at ...626...> a écrit:
>>
>> No... again. My initial mail was correct. It should be:
>>> strinchar = Mid(strinchar, 1, (InStr(strinchar, ")", -1) - 1))
>>>
>>> But the IDE makes highlighting bug with the brackets.
>>>
>>>
>>> Jussi
>>>
>>> On Sat, Jul 29, 2017 at 3:33 AM, Jussi Lahtinen <jussi.lahtinen at ...626...
>>> wrote:
>>>
>>> Hmmm... sorry, no mistake... I will look closer.
>>>>
>>>> Jussi
>>>>
>>>> On Sat, Jul 29, 2017 at 3:33 AM, Jussi Lahtinen <
>>>> jussi.lahtinen at ...626...>
>>>> wrote:
>>>>
>>>> Because the line makes no sense at all. Try to remove ")".
>>>>>
>>>>> Jussi
>>>>>
>>>>> On Fri, Jul 28, 2017 at 11:55 PM, PICCORO McKAY Lenz <
>>>>> mckaygerhard at ...626...> wrote:
>>>>>
>>>>> in the following code:
>>>>>>      strinchar = Mid(strinchar, 1, InStr(strinchar, ")", -1) - 1)
>>>>>>
>>>>>> IDE said error invalid argument, but if i do:
>>>>>>
>>>>>>      psotionlen = InStr(strinchar, ")", -1) - 1
>>>>>>       strinchar = Mid(strinchar, 1, psotionlen)
>>>>>>
>>>>>> works, why?
>>>>>>
>>>>>> i wnat to remove the last occurence of a char but bybass some possible
>>>>>> spaces/chars at the end of string
>>>>>>
>>>>>> Lenz McKAY Gerardo (PICCORO)
>>>>>> http://qgqlochekone.blogspot.com
>>>>>>
>> Actually, his original code is correct. For me it runs without error in
>> the IDE using
>> the 3.10 development version, but the editor is indeed having trouble
>> matching the
>> parentheses.
>>
>> I also tried it on the playground (which also uses 3.10) and it works
>> fine : https://gambas-playground.proko.eu/?gist=97ed16795393aa3b689
>> 13025e5d2b83c .
>>
>> However the playground's editor does match the parentheses correctly. :)
>>
>> Which Gambas version are you using ? There may be an old bug here.
>>
>> --
>> Adrien Prokopowicz
>>
>>
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