3 d@sNddlmZmZmZmZmZmZmZmZm Z m Z m Z m Z dddZ ddZdS)) AllExpression AndExpressionApplicationExpressionEqualityExpressionExistsExpression IffExpression ImpExpressionNegatedExpression OrExpressionVariableExpressionskolem_functionunique_variableNcCsr|dkrt}|dkrt}t|tr\t|j||jhB||jhB}|j|jtt|dSt|t rt|j ||t|j ||@St|t rt t|j ||t|j ||St|trt t|j ||t|j ||St|tr t t|j ||t|j ||t t|j ||t|j ||@St|tr0|St|tr|j}t|trt|j |||jhB}|r~|j|jt|Stt|d}|j|j|Sqnt|t rt t|j ||t|j ||St|t rt|j ||t|j ||@St|tr"t|j ||t|j ||@St|trnt t|j ||t|j ||t t|j ||t|j ||@St|tr~|St|trt|j||St|trt|j ||jhB||jhB}|j|jtt|dSt|tr|Std|ntt|trRt|j|||jhB}|r4|j|jt|Stt|d}|j|j|Snt|trb|Std|dS)zO Skolemize the expression and convert to conjunctive normal form (CNF) N)ignorez'%s' cannot be skolemized)set isinstancer skolemizetermvariablereplacer r rfirstsecondr to_cnfrrrr r rr Exception)Z expressionZ univ_scopeZused_variablesrZnegatedZskolem_constantr2/tmp/pip-build-v9q4h5k9/nltk/nltk/sem/skolemize.pyrs                        rcCs`t|tr*t|j|}t|j|}||@St|trTt||j}t||j}||@S||BSdS)zI Convert this split disjunction to conjunctive normal form (CNF) N)rrrrr)rrZr_firstZr_secondrrrrs      r)NN)Znltk.sem.logicrrrrrrrr r r r r rrrrrr s8 n