[Haskell-beginners] Parser using the show method

[PICCA Frederic-Emmanuel]

Re-Hello,

is there a way to apply a function to all constructors of this  this type ?

Instead of doing this ?

do         sg P1
            sg P2
            sg P21
            sg C2
            sg P222
            sg P2221
            sg P21212
            sg P212121
            sg C222
            sg C2221
            sg F222
            sg I222
            sg I212121
            sg P4
            sg P41
            sg P42
            sg P43
            sg P422
            sg P4212
            sg P4122
            sg P41212
            sg P4222
            sg P42212
            sg P4322
            sg P43212
            sg I4
            sg I41
            sg I422
            sg I4122
            sg P3
            sg P31
            sg P32
            sg P312
            sg P321
            sg P3112
            sg P3121
            sg P3212
            sg P3221
            sg P6
            sg P61
            sg P62
            sg P63
            sg P64
            sg P65
            sg P622
            sg P6122
            sg P6522
            sg P6222
            sg P6422
            sg P6322
            sg R3
            sg R32
            sg P23
            sg P213
            sg P432
            sg P4232
            sg P4332
            sg P4132
            sg F23
            sg F432
            sg F4132
            sg I23
            sg I213
            sg I432
            sg I4132