from django.template import Context, Template, Variable, VariableDoesNotExist
from django.template.base import DebugLexer, Lexer, TokenType
from django.test import SimpleTestCase
from django.utils.translation import gettext_lazy
class LexerTestMixin:
template_string = (
"text\n"
"{% if test %}{{ varvalue }}{% endif %}"
"{#comment {{not a var}} %{not a block}% #}"
"end text"
)
expected_token_tuples = [
# (token_type, contents, lineno, position)
(TokenType.TEXT, "text\n", 1, (0, 5)),
(TokenType.BLOCK, "if test", 2, (5, 18)),
(TokenType.VAR, "varvalue", 2, (18, 32)),
(TokenType.BLOCK, "endif", 2, (32, 43)),
(TokenType.COMMENT, "comment {{not a var}} %{not a block}%", 2, (43, 85)),
(TokenType.TEXT, "end text", 2, (85, 93)),
]
def test_tokenize(self):
tokens = self.lexer_class(self.template_string).tokenize()
token_tuples = [
(t.token_type, t.contents, t.lineno, t.position) for t in tokens
]
self.assertEqual(token_tuples, self.make_expected())
def make_expected(self):
raise NotImplementedError("This method must be implemented by a subclass.")
class LexerTests(LexerTestMixin, SimpleTestCase):
lexer_class = Lexer
def make_expected(self):
# The non-debug lexer does not record position.
return [t[:-1] + (None,) for t in self.expected_token_tuples]
class DebugLexerTests(LexerTestMixin, SimpleTestCase):
lexer_class = DebugLexer
def make_expected(self):
return self.expected_token_tuples
class TemplateTests(SimpleTestCase):
def test_lazy_template_string(self):
template_string = gettext_lazy("lazy string")
self.assertEqual(Template(template_string).render(Context()), template_string)
def test_repr(self):
template = Template(
"\n"
"{% if test %}{{ varvalue }}
{% endif %}"
""
)
self.assertEqual(
repr(template),
'',
)
class VariableDoesNotExistTests(SimpleTestCase):
def test_str(self):
exc = VariableDoesNotExist(msg="Failed lookup in %r", params=({"foo": "bar"},))
self.assertEqual(str(exc), "Failed lookup in {'foo': 'bar'}")
class VariableTests(SimpleTestCase):
def test_integer_literals(self):
self.assertEqual(
Variable("999999999999999999999999999").literal, 999999999999999999999999999
)
def test_nonliterals(self):
"""Variable names that aren't resolved as literals."""
var_names = []
for var in ("inf", "infinity", "iNFiniTy", "nan"):
var_names.extend((var, "-" + var, "+" + var))
for var in var_names:
with self.subTest(var=var):
self.assertIsNone(Variable(var).literal)