[Haskell-cafe] initialization of AlexUserState

[Vanessa McHale]

I would just add a function

setAlexUserState :: AlexUserState -> Alex ()
setAlexUserState = ...

and then write another

run :: AlexUserState -> Alex ()
run st = do
    setAlexUserState st
    alexMonadScan

or what have you

On 3/15/19 6:16 AM, Kees Bleijenberg wrote:
>
> Hi All,
>
>  
>
> I have a Alex lexer with wrapper "monadUserState-bytestring". The
> AlexUserState = AlexUserState {sheetNames:: {String], currSheet::
> Int}.  The lexer should check whether a found sheetname is in
> sheetNames. The sheetNames from AlexUserState come from outside. I
> want to invoke the lexer many times with different AlexUserStates.
>  Therefore the alexInitUserState function is not what I want. I’de
> like to initialize the AlexUserState while starting the lexer, i.e. as
> a parameter to runAlex. Can that be done?
>
>  
>
> Kees
>
>
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