[Gambas-user] Custom Eval (was Re: The new Border class)

[Fabien Bodard]

oups i missed for the first one :
iResult = MyCol[eval("Sum_of_Value_page_" & CStr(Page_Nr), myCol)]

2015-02-08 14:45 GMT+01:00 Fabien Bodard <gambas.fr at ...626...>:
> ???
> If I summarize  what i see I can answer :
>
> iResult = MyCol[eval(eval("Sum_of_Value_page_" & CStr(Page_Nr), myCol)]
>
> or simply
>
> iResult = MyCol["Sum_of_Value_page_" & CStr(MyCol["Page_Nr"])]
>
> Well if you have a point where you fill myCol so no need to store :
>
> iResult = MyCol["Sum_of_Value_page_" & iPage]
>
>
> BUT ... I'm not sure it was the goal of your query, so please be more
> precise or give an example. :-)
>
> 2015-02-07 22:41 GMT+01:00 Charlie Reinl <Karl.Reinl at ...9...>:
>> Am Montag, den 05.01.2015, 22:16 +0100 schrieb Fabien Bodard:
>>> 2015-01-05 22:02 GMT+01:00 Benoît Minisini <gambas at ...1...>:
>>> > Le 05/01/2015 21:46, Fabien Bodard a écrit :
>>> >>> What do you mean?
>>> >>>
>>> >>> --
>>> >>> Benoît Minisini
>>> >>
>>> >> I think about a tool that will be able to interpret inline formulas
>>> >> like in a spreedsheet.
>>> >>
>>> >> i have done something like that for playing myself but i'm not a
>>> >> specialist of interpreters like you.
>>> >>
>>> >> for example :
>>> >>
>>> >> =Myvar1 + 3 *(3*myvar2)
>>> >> =MYFUNCTION(myvar1; myvar2) + MyVar3
>>> >>
>>> >> the function can be initialised for example like
>>> >>
>>> >> Interpret.Function.Add("MYFunction", nbreArgs, typeRetVal)
>>> >>
>>> >> And will call Public Sub Interpret_MyFunction(Arg1 as variant, arg2 as
>>> >> variant,...) as variant
>>> >>
>>> >> A Special Event will query the vars values : Public Sub
>>> >> Interpret_GetVar(sVarName as string) as Variant
>>> >>
>>> >> All the stuff of the interpreter will be to manage conditionnal
>>> >> requirement and calculate values  or concatenate strings. So this tool
>>> >> will be usefull for user level programmation.
>>> >> Like in spreadsheet or in reports formulas. It can be extended near to
>>> >> unlimited. Some functions can be hardcoded like mathematical ones.
>>> >> Others are depend of the context so must be implemented for each
>>> >> widget or component. It's not the fastest way to make compute but the
>>> >> most flexible.
>>> >>
>>> >> I hope my english is not inapprehensible
>>> >>
>>> >
>>> > If I understand well, you need some sort of custom Eval().
>>> >
>>> > More precisely, I think what you need is a Gambas hook inside the reader
>>> > part of Eval() (the first part of its internal compiler) where you tell
>>> > how to translate any symbol into a Gambas function or a call to a method
>>> > into one of your classes, everything else being forbidden.
>>> >
>>> > That way, you keep the Gambas syntax, except that all function names are
>>> > redefined, and every interpreter class is forbidden except the one you
>>> > allow explicitly.
>>>
>>> Yes it can be the idea. But can it be compatible with 'STANDARD'
>>> formulas style too ? were separtors are ';'...
>>>
>>> But your idea will be a great step too and i think you have understand
>>> the back of my mind.
>>>
>>>
>>>
>>> >
>>> > Just an idea...
>>> >
>>> > --
>>> > Benoît Minisini
>>
>> Salut Benoît,
>>
>> searching something for my problem, I found this mail. What I need is
>> something you describe as "Gambas hook inside the reader part of
>> Eval()".
>> In my Collection passed to eval, I have "Sum_of_Value_page_1" to
>> "Sum_of_Value_page_35"  and the "Page_Nr". Now for picking the right
>> value I need the eval("Sum_of_Value_page_" & CStr(Page_Nr), myCol).
>> Done like that, I get "Sum_of_Value_page_1" to "Sum_of_Value_page_35" as
>> return. That is nice, but I want the result of that, stored in myCol.
>>
>> Thought I could resolve that with a public function called by eval
>> failed also.
>> "Public Function Sum(sFiledName as string) as Variant" isn't called.
>>
>> So I need that what you call "Gambas hook inside the reader part of
>> Eval()".... Or something that works like I know from Clipper, called
>> Code-Blocks. Search I-net for "clipper code blocks"
>>
>>
>>
>>
>> --
>> Amicalement
>> Charlie
>>
>>
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>
>
>
> --
> Fabien Bodard



-- 
Fabien Bodard