def parse(tokens):
position = tokens.peek().position
if tokens.peek() != '(':
return None
tokens.expect('(')
childExpression = LogicalExpression.parse(tokens)
if childExpression is None:
raise error.SyntaxError(position, 'Expected expression, got %r' % tokens.peek())
if tokens.peek() != ')':
raise error.SyntaxError, "Expected ')', got %r" % tokens.peek()
tokens.getNext()
return ParenthExpression(childExpression)
def testBadParse(self):
tokens = lex("1 and ")
self.failUnlessRaises(
error.SyntaxError,
lambda: LogicalExpression.parse(tokens)
)
def testParseOr(self):
le = LogicalExpression.parse(lex("1 or 1"))
self.failUnless(isinstance(le, LogicalExpression))
