def testSemantic(self):
tokens = lex('"abcd"+3')
expr = AddExpression.parse(tokens)
from nine.scope import Scope
scope = Scope(parent=None)
from nine import error
self.failUnlessRaises(error.TypeError,
lambda: expr.semantic(scope)
)
def parse(tokens):
from ast.addexpression import AddExpression
pos = tokens.getPosition()
operation = None
expr = AddExpression.parse(tokens)
if expr is None:
return None
while True:
peek = tokens.peek()
if peek in lexer.ShiftOperators:
tokens.getNext()
rhs = AddExpression.parse(tokens)
if rhs is None:
raise SyntaxError, 'Expected expression, got %r' % tokens.peek()
expr = ShiftExpression(expr, rhs, peek)
else:
return expr
def testParseSub(self):
tokens = lex("12 - 3")
result = AddExpression.parse(tokens)
self.failUnless(isinstance(result, AddExpression), repr(result))
