def _logical(op):
return lexeme(pc.char('(').skip(
lexeme(string(op.call_name)).skip(
many_list(expr).bind(lambda exprs:
pc.char(')').skip(
inject(op(*exprs)))))))
identifier = concat(extended_alph_char, many(choice(extended_alph_char, digit))).drop_whitespace() \
.with_name('identifier')
primitive = pc.char('(').skip(
identifier.bind(lambda i: cond(i in Primitive.__registry__.keys(),
many_list(expr).bind(lambda args:
pc.char(')').skip(
inject(Primitive[i](*args)))))))\
.with_name('primitive')
conditional = pc.char('(').skip(
lexeme(string('if')).skip(
expr.bind(lambda condition:
expr.bind(lambda if_branch:
expr.bind(lambda else_branch:
pc.char(')').skip(
inject(If(condition, if_branch, else_branch))))))))\
.with_name('conditional')
def _logical(op):
return lexeme(pc.char('(').skip(
lexeme(string(op.call_name)).skip(
many_list(expr).bind(lambda exprs:
pc.char(')').skip(
inject(op(*exprs)))))))
and_ = _logical(And).with_name('and')
or_ = _logical(Or).with_name('or')
logical = choice(and_, or_)