plain IF structure with one def-ed token and one literal












4















In some hand-me-down tex i inherited, a control sequence is used as a variable, for instance:



defaccessflavor{ats}


it is used to generate postfixes on included tex files (called, i.e., image01_ats) and the like.



I want to use it in a conditional structure, i. e. something like 



ifaccessflavor ats

This text is only shown if the Flavor of Access is 'ats'.

fi


I tried a a lot of variations, including various brackets, escape sequences and macros, but i cannot get it to work. Mostly, not even an error message appears. The online examples i found either deal with a more specific IF, like ifodd, ifx, etc., or more (seemingly) complex cases like testing two macros for identity.



Can somebody clear up the usage for me?






ifthenelse







share|improve this question

























  • I can recommend the multiaudience package which allows you to separate some parts of your text for different "audiences" and provides higher-level switches. As part of this, you can use its CurrentAudience variable to get the audience you are currently writing for (e.g. for file names).

    – TeXnician
    Apr 15 at 14:57
















4















In some hand-me-down tex i inherited, a control sequence is used as a variable, for instance:



defaccessflavor{ats}


it is used to generate postfixes on included tex files (called, i.e., image01_ats) and the like.



I want to use it in a conditional structure, i. e. something like 



ifaccessflavor ats

This text is only shown if the Flavor of Access is 'ats'.

fi


I tried a a lot of variations, including various brackets, escape sequences and macros, but i cannot get it to work. Mostly, not even an error message appears. The online examples i found either deal with a more specific IF, like ifodd, ifx, etc., or more (seemingly) complex cases like testing two macros for identity.



Can somebody clear up the usage for me?






ifthenelse







share|improve this question

























  • I can recommend the multiaudience package which allows you to separate some parts of your text for different "audiences" and provides higher-level switches. As part of this, you can use its CurrentAudience variable to get the audience you are currently writing for (e.g. for file names).

    – TeXnician
    Apr 15 at 14:57














4












4








4








In some hand-me-down tex i inherited, a control sequence is used as a variable, for instance:



defaccessflavor{ats}


it is used to generate postfixes on included tex files (called, i.e., image01_ats) and the like.



I want to use it in a conditional structure, i. e. something like 



ifaccessflavor ats

This text is only shown if the Flavor of Access is 'ats'.

fi


I tried a a lot of variations, including various brackets, escape sequences and macros, but i cannot get it to work. Mostly, not even an error message appears. The online examples i found either deal with a more specific IF, like ifodd, ifx, etc., or more (seemingly) complex cases like testing two macros for identity.



Can somebody clear up the usage for me?






ifthenelse







share|improve this question
















In some hand-me-down tex i inherited, a control sequence is used as a variable, for instance:



defaccessflavor{ats}


it is used to generate postfixes on included tex files (called, i.e., image01_ats) and the like.



I want to use it in a conditional structure, i. e. something like 



ifaccessflavor ats

This text is only shown if the Flavor of Access is 'ats'.

fi


I tried a a lot of variations, including various brackets, escape sequences and macros, but i cannot get it to work. Mostly, not even an error message appears. The online examples i found either deal with a more specific IF, like ifodd, ifx, etc., or more (seemingly) complex cases like testing two macros for identity.



Can somebody clear up the usage for me?






ifthenelse




ifthenelse






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Apr 15 at 15:18









Kurt

41.6k950164




41.6k950164










asked Apr 15 at 14:54









bukwyrmbukwyrm

1212




1212













  • I can recommend the multiaudience package which allows you to separate some parts of your text for different "audiences" and provides higher-level switches. As part of this, you can use its CurrentAudience variable to get the audience you are currently writing for (e.g. for file names).

    – TeXnician
    Apr 15 at 14:57



















  • I can recommend the multiaudience package which allows you to separate some parts of your text for different "audiences" and provides higher-level switches. As part of this, you can use its CurrentAudience variable to get the audience you are currently writing for (e.g. for file names).

    – TeXnician
    Apr 15 at 14:57

















I can recommend the multiaudience package which allows you to separate some parts of your text for different "audiences" and provides higher-level switches. As part of this, you can use its CurrentAudience variable to get the audience you are currently writing for (e.g. for file names).

– TeXnician
Apr 15 at 14:57





I can recommend the multiaudience package which allows you to separate some parts of your text for different "audiences" and provides higher-level switches. As part of this, you can use its CurrentAudience variable to get the audience you are currently writing for (e.g. for file names).

– TeXnician
Apr 15 at 14:57










2 Answers
2






active

oldest

votes


















3














documentclass{article}

defatscomparetoken{ats}

newcommanddomytest{%

  ifxatscomparetokenaccessflavor MATCHES atselse DOES NOT MATCH atsfi

}

begin{document}

defaccessflavor{ats}

domytest



defaccessflavor{pdq}

domytest

end{document}


enter image description here






share|improve this answer
























  • Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

    – bukwyrm
    Apr 15 at 15:22













  • @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

    – Steven B. Segletes
    Apr 15 at 15:50



















2














If you want to maintain the if...else...fi structure, you can use



documentclass{article}

usepackage{pdftexcmds}



makeatletter

newcommandflavor[1]{%

  TTfi

  ifnumpdf@strcmp{#1}{accessflavor}=z@

}

makeatother



begin{document}



defaccessflavor{ats}



Shown



ifflavor{ats}

This text is only shown if the Flavor of Access is `ats'.

fi



defaccessflavor{notats}



Not shown



ifflavor{ats}

This text is only shown if the Flavor of Access is `ats'.

fi



end{document}


The usage of pdftexcmds is to obtain engine independence, so the code works with pdftex, luatex and xetex.



The trick is that if expands tokens.



Note that this can be used inside other conditionals.



enter image description here






share|improve this answer
























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    2 Answers
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    2 Answers
    2






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    active

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    active

    oldest

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    3














    documentclass{article}
    
defatscomparetoken{ats}
    
newcommanddomytest{%
    
  ifxatscomparetokenaccessflavor MATCHES atselse DOES NOT MATCH atsfi
    
}
    
begin{document}
    
defaccessflavor{ats}
    
domytest
    

    
defaccessflavor{pdq}
    
domytest
    
end{document}


    enter image description here






    share|improve this answer
























    • Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

      – bukwyrm
      Apr 15 at 15:22













    • @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

      – Steven B. Segletes
      Apr 15 at 15:50
















    3














    documentclass{article}
    
defatscomparetoken{ats}
    
newcommanddomytest{%
    
  ifxatscomparetokenaccessflavor MATCHES atselse DOES NOT MATCH atsfi
    
}
    
begin{document}
    
defaccessflavor{ats}
    
domytest
    

    
defaccessflavor{pdq}
    
domytest
    
end{document}


    enter image description here






    share|improve this answer
























    • Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

      – bukwyrm
      Apr 15 at 15:22













    • @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

      – Steven B. Segletes
      Apr 15 at 15:50














    3












    3








    3







    documentclass{article}
    
defatscomparetoken{ats}
    
newcommanddomytest{%
    
  ifxatscomparetokenaccessflavor MATCHES atselse DOES NOT MATCH atsfi
    
}
    
begin{document}
    
defaccessflavor{ats}
    
domytest
    

    
defaccessflavor{pdq}
    
domytest
    
end{document}


    enter image description here






    share|improve this answer













    documentclass{article}
    
defatscomparetoken{ats}
    
newcommanddomytest{%
    
  ifxatscomparetokenaccessflavor MATCHES atselse DOES NOT MATCH atsfi
    
}
    
begin{document}
    
defaccessflavor{ats}
    
domytest
    

    
defaccessflavor{pdq}
    
domytest
    
end{document}


    enter image description here







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered Apr 15 at 15:01









    Steven B. SegletesSteven B. Segletes

    163k9207419




    163k9207419













    • Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

      – bukwyrm
      Apr 15 at 15:22













    • @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

      – Steven B. Segletes
      Apr 15 at 15:50



















    • Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

      – bukwyrm
      Apr 15 at 15:22













    • @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

      – Steven B. Segletes
      Apr 15 at 15:50

















    Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

    – bukwyrm
    Apr 15 at 15:22







    Thank you! Can you explain what is going on? If i understand it correctly, you def-ed atscomparetoken so that the ifx could work on two tokens - is there a reason you packed the whole thing into a command? Also, do you know why one needs the string as an expansion inside a token (for the ifx case it is clear, but why dies if not work?)

    – bukwyrm
    Apr 15 at 15:22















    @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

    – Steven B. Segletes
    Apr 15 at 15:50





    @bukwyrm Correct, the ifx works on two tokens, and the comparison is whether the substitution text (one level of expansion) for the two tokens matches or not. The problem with trying to do this with if is that if fully expands and then compares the first two tokens; thus, ifaccessflavor ats expands to if atsats and a is compared to t, with the remaining sats extraneous.

    – Steven B. Segletes
    Apr 15 at 15:50











    2














    If you want to maintain the if...else...fi structure, you can use



    documentclass{article}
    
usepackage{pdftexcmds}
    

    
makeatletter
    
newcommandflavor[1]{%
    
  TTfi
    
  ifnumpdf@strcmp{#1}{accessflavor}=z@
    
}
    
makeatother
    

    
begin{document}
    

    
defaccessflavor{ats}
    

    
Shown
    

    
ifflavor{ats}
    
This text is only shown if the Flavor of Access is `ats'.
    
fi
    

    
defaccessflavor{notats}
    

    
Not shown
    

    
ifflavor{ats}
    
This text is only shown if the Flavor of Access is `ats'.
    
fi
    

    
end{document}


    The usage of pdftexcmds is to obtain engine independence, so the code works with pdftex, luatex and xetex.



    The trick is that if expands tokens.



    Note that this can be used inside other conditionals.



    enter image description here






    share|improve this answer




























      2














      If you want to maintain the if...else...fi structure, you can use



      documentclass{article}
      
usepackage{pdftexcmds}
      

      
makeatletter
      
newcommandflavor[1]{%
      
  TTfi
      
  ifnumpdf@strcmp{#1}{accessflavor}=z@
      
}
      
makeatother
      

      
begin{document}
      

      
defaccessflavor{ats}
      

      
Shown
      

      
ifflavor{ats}
      
This text is only shown if the Flavor of Access is `ats'.
      
fi
      

      
defaccessflavor{notats}
      

      
Not shown
      

      
ifflavor{ats}
      
This text is only shown if the Flavor of Access is `ats'.
      
fi
      

      
end{document}


      The usage of pdftexcmds is to obtain engine independence, so the code works with pdftex, luatex and xetex.



      The trick is that if expands tokens.



      Note that this can be used inside other conditionals.



      enter image description here






      share|improve this answer


























        2












        2








        2







        If you want to maintain the if...else...fi structure, you can use



        documentclass{article}
        
usepackage{pdftexcmds}
        

        
makeatletter
        
newcommandflavor[1]{%
        
  TTfi
        
  ifnumpdf@strcmp{#1}{accessflavor}=z@
        
}
        
makeatother
        

        
begin{document}
        

        
defaccessflavor{ats}
        

        
Shown
        

        
ifflavor{ats}
        
This text is only shown if the Flavor of Access is `ats'.
        
fi
        

        
defaccessflavor{notats}
        

        
Not shown
        

        
ifflavor{ats}
        
This text is only shown if the Flavor of Access is `ats'.
        
fi
        

        
end{document}


        The usage of pdftexcmds is to obtain engine independence, so the code works with pdftex, luatex and xetex.



        The trick is that if expands tokens.



        Note that this can be used inside other conditionals.



        enter image description here






        share|improve this answer













        If you want to maintain the if...else...fi structure, you can use



        documentclass{article}
        
usepackage{pdftexcmds}
        

        
makeatletter
        
newcommandflavor[1]{%
        
  TTfi
        
  ifnumpdf@strcmp{#1}{accessflavor}=z@
        
}
        
makeatother
        

        
begin{document}
        

        
defaccessflavor{ats}
        

        
Shown
        

        
ifflavor{ats}
        
This text is only shown if the Flavor of Access is `ats'.
        
fi
        

        
defaccessflavor{notats}
        

        
Not shown
        

        
ifflavor{ats}
        
This text is only shown if the Flavor of Access is `ats'.
        
fi
        

        
end{document}


        The usage of pdftexcmds is to obtain engine independence, so the code works with pdftex, luatex and xetex.



        The trick is that if expands tokens.



        Note that this can be used inside other conditionals.



        enter image description here







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Apr 15 at 15:29









        egregegreg

        735k8919343260




        735k8919343260






























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