"""

Testing some internals of the template processing. These are *not* examples to be copied in user code.

"""

from unittest import TestCase

from django.template import (TokenParser, FilterExpression, Parser, Variable,

    TemplateSyntaxError)

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": u"News"}}

        p = Parser("")

        def fe_test(s, val):

            self.assertEqual(FilterExpression(s, p).resolve(c), val)

        fe_test("article.section", u"News")

        fe_test("article.section|upper", u"NEWS")

        fe_test(u'"News"', u"News")

        fe_test(u"'News'", u"News")

        fe_test(ur'"Some \"Good\" News"', u'Some "Good" News')

        fe_test(ur'"Some \"Good\" News"', u'Some "Good" News')

        fe_test(ur"'Some \'Bad\' News'", u"Some 'Bad' News")

        fe = FilterExpression(ur'"Some \"Good\" News"', p)

        self.assertEqual(fe.filters, [])

        self.assertEqual(fe.var, u'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": u"News"}}

        self.assertEqual(Variable("article.section").resolve(c), "News")

        self.assertEqual(Variable(u'"News"').resolve(c), "News")

        self.assertEqual(Variable(u"'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(ur'"Some \"Good\" News"').resolve(c), 'Some "Good" News'

        )

        self.assertEqual(

            Variable(ur"'Some \'Better\' News'").resolve(c), "Some 'Better' News"

        )

        # Variables should reject access of attributes beginning with

        # underscores.

        self.assertRaises(TemplateSyntaxError,

            Variable, "article._hidden"

        )