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gf-core/lib/src/abstract/Transfer.gf

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abstract Transfer = Sentence, Verb, Adverb, Structural, NumeralTransfer ** {
{-
-- examples of transfer: to test,
> i LangEng.gf
> p "she sees him" | pt -transfer=active2passive | l
he is seen by her
> p "wouldn't she see him" | pt -transfer=active2passive | l
wouldn't he be seen by her
> p -cat=NP "3 cats with 4 dogs" | pt -transfer=digits2numeral | l
three cats with four dogs
-}
fun
active2passive : Cl -> Cl ;
def
active2passive (PredVP subj (ComplSlash (SlashV2a v) obj)) =
PredVP obj (AdvVP (PassV2 v) (PrepNP by8agent_Prep subj)) ;
active2passive (PredVP subj (AdvVP (ComplSlash (SlashV2a v) obj) adv)) =
PredVP obj (AdvVP (AdvVP (PassV2 v) (PrepNP by8agent_Prep subj)) adv) ;
active2passive (PredVP subj (AdVVP adv (ComplSlash (SlashV2a v) obj))) =
PredVP obj (AdVVP adv (AdvVP (PassV2 v) (PrepNP by8agent_Prep subj))) ;
active2passive cl = cl ;
}