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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