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"""
Testing some internals of the template processing. These are *not* examples to be copied in user code.
"""
from __future__ import unicode_literals
from django.template import (TokenParser, FilterExpression, Parser, Variable,
TemplateSyntaxError)
from django.utils.unittest import TestCase
class ParserTests(TestCase):
def test_token_parsing(self):
# Tests for TokenParser behavior in the face of quoted strings with
# spaces.
p = TokenParser("tag thevar|filter sometag")
self.assertEqual(p.tagname, "tag")
self.assertEqual(p.value(), "thevar|filter")
self.assertTrue(p.more())
self.assertEqual(p.tag(), "sometag")
self.assertFalse(p.more())
p = TokenParser('tag "a value"|filter sometag')
self.assertEqual(p.tagname, "tag")
self.assertEqual(p.value(), '"a value"|filter')
self.assertTrue(p.more())
self.assertEqual(p.tag(), "sometag")
self.assertFalse(p.more())
p = TokenParser("tag 'a value'|filter sometag")
self.assertEqual(p.tagname, "tag")
self.assertEqual(p.value(), "'a value'|filter")
self.assertTrue(p.more())
self.assertEqual(p.tag(), "sometag")
self.assertFalse(p.more())
def test_filter_parsing(self):
c = {"article": {"section": "News"}}
p = Parser("")
def fe_test(s, val):
self.assertEqual(FilterExpression(s, p).resolve(c), val)
fe_test("article.section", "News")
fe_test("article.section|upper", "NEWS")
fe_test('"News"', "News")
fe_test("'News'", "News")
fe_test(r'"Some \"Good\" News"', 'Some "Good" News')
fe_test(r'"Some \"Good\" News"', 'Some "Good" News')
fe_test(r"'Some \'Bad\' News'", "Some 'Bad' News")
fe = FilterExpression(r'"Some \"Good\" News"', p)
self.assertEqual(fe.filters, [])
self.assertEqual(fe.var, 'Some "Good" News')
# Filtered variables should reject access of attributes beginning with
# underscores.
self.assertRaises(TemplateSyntaxError,
FilterExpression, "article._hidden|upper", p
)
def test_variable_parsing(self):
c = {"article": {"section": "News"}}
self.assertEqual(Variable("article.section").resolve(c), "News")
self.assertEqual(Variable('"News"').resolve(c), "News")
self.assertEqual(Variable("'News'").resolve(c), "News")
# Translated strings are handled correctly.
self.assertEqual(Variable("_(article.section)").resolve(c), "News")
self.assertEqual(Variable('_("Good News")').resolve(c), "Good News")
self.assertEqual(Variable("_('Better News')").resolve(c), "Better News")
# Escaped quotes work correctly as well.
self.assertEqual(
Variable(r'"Some \"Good\" News"').resolve(c), 'Some "Good" News'
)
self.assertEqual(
Variable(r"'Some \'Better\' News'").resolve(c), "Some 'Better' News"
)
# Variables should reject access of attributes beginning with
# underscores.
self.assertRaises(TemplateSyntaxError,
Variable, "article._hidden"
)
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