Exemple #1
0
def OR_handler(exp):
    """We have to consider three cases:

    (OR)            ===>   #t

    (OR e1)         ===>   e1

    (OR e1 e2 ...)  ===>   (let ((temp-val e1))
                              (IF temp-val
                                  temp-val
                                  (OR e2 ...)))

                    ===>  ((lambda (temp-val)
                              (IF temp-val
                                  temp-val
                                  (OR e2 ...)))
                           e1)
    """
    clauses = and_clauses(exp)
    if pair.length(clauses) == 0:
        return symbol.true
    elif pair.length(clauses) == 1:
        return pair.car(clauses)
    else:
        temporarySymbol = symbol.makeUniqueTemporary()
        lambdaVal = expressions.makeLambda(
            pair.list(temporarySymbol),
            pair.list(expressions.makeIf(temporarySymbol,
                                         temporarySymbol,
                                         makeOr(pair.cdr(clauses)))))
        return expressions.makeApplication(
            lambdaVal, pair.list(pair.car(clauses)))
Exemple #2
0
 def c_expanded(expandedBody):
     return pogo.bounce(cont, expressions.makeLambda(parameters,
                                                     expandedBody))