def setUp(self):
self.lexer = SubstituteLexer()
class TestSubstituteLexer(unittest.TestCase):
def setUp(self):
self.lexer = SubstituteLexer()
def testCanParseEmptyInput(self):
actual = self.lexer.parse('')
self.assertEqual(actual, ['', ''])
def testCanParseShortFormWithFlagsOnly(self):
one_flag = self.lexer.parse(r'g')
many_flags = self.lexer.parse(r'gi')
self.assertEqual(one_flag, ['g', ''])
self.assertEqual(many_flags, ['gi', ''])
def testCanParseShortFormWithCountOnly(self):
actual = self.lexer.parse(r'100')
self.assertEqual(actual, ['', '100'])
def testCanParseShortFormWithFlagsAndCount(self):
actual_1 = self.lexer.parse(r'gi100')
actual_2 = self.lexer.parse(r' gi 100 ')
self.assertEqual(actual_1, ['gi', '100'])
self.assertEqual(actual_2, ['gi', '100'])
def testThrowErrorIfCountIsFollowedByAnything(self):
self.assertRaises(SyntaxError, self.lexer.parse, r"100gi")
def testThrowErrorIfShortFormIsFollowedByAnythingOtherThanFlagsOrCount(self):
self.assertRaises(SyntaxError, self.lexer.parse, r"x")
def testCanParseOneSeparatorOnly(self):
actual = self.lexer.parse(r"/")
self.assertEqual(actual, ['', '', '', ''])
def testCanParseTwoSeparatorsOnly(self):
actual = self.lexer.parse(r"//")
self.assertEqual(actual, ['', '', '', ''])
def testCanParseThreeSeparatorsOnly(self):
actual = self.lexer.parse(r"///")
self.assertEqual(actual, ['', '', '', ''])
def testCanParseOnlySearchPattern(self):
actual = self.lexer.parse(r"/foo")
self.assertEqual(actual, ['foo', '', '', ''])
def testCanParseOnlyReplacementString(self):
actual = self.lexer.parse(r"//foo")
self.assertEqual(actual, ['', 'foo', '', ''])
def testCanParseOnlyFlags(self):
actual = self.lexer.parse(r"///gi")
self.assertEqual(actual, ['', '', 'gi', ''])
def testCanParseOnlyCount(self):
actual = self.lexer.parse(r"///100")
self.assertEqual(actual, ['', '', '', '100'])
def testCanParseOnlyFlagsAndCount(self):
actual = self.lexer.parse(r"///gi100")
self.assertEqual(actual, ['', '', 'gi', '100'])
def testThrowIfFlagsAndCountAreReversed(self):
self.assertRaises(SyntaxError, self.lexer.parse, r"///100gi")
def testThrowIfFlagsAndCountAreInvalid(self):
self.assertRaises(SyntaxError, self.lexer.parse, r"///x")
def testCanEscapeDelimiter(self):
actual = self.lexer.parse(r"/foo\/")
self.assertEqual(actual, ['foo/', '', '', ''])
def testCanEscapeDelimiterComplex(self):
actual = self.lexer.parse(r"/foo\//hello")
self.assertEqual(actual, ['foo/', 'hello', '', ''])