def elements(self, ast):
elements = [e for e in ast if e is not None]
if not elements:
return model.Void()
elif len(elements) == 1:
return elements[0]
else:
return model.Sequence(AST(sequence=elements))
def negative(self, ast):
neg = model.NegativeLookahead(ast)
any = model.Pattern('.')
return model.Sequence(AST(sequence=[neg, any]))
def negative(self, ast):
neg = model.LookaheadNot(ast)
any = model.Pattern('.')
return model.Sequence([neg, any])
def sequence(self, ast, *args):
seq = ast.sequence
assert isinstance(seq, list), str(seq)
if len(seq) == 1:
return seq[0]
return grammars.Sequence(ast)