import unittest

from django.utils import html

class TestUtilsHtml(unittest.TestCase):

    def check_output(self, function, value, output=None):

        """

        Check that function(value) equals output.  If output is None,

        check that function(value) equals value.

        """

        if output is None:

            output = value

        self.assertEqual(function(value), output)

    def test_escape(self):

        f = html.escape

        items = (

            ('&','&'),

            ('<', '&lt;'),

            ('>', '>'),

            ('"', '"'),

            ("'", '''),

        )

        # Substitution patterns for testing the above items.

        patterns = ("%s", "asdf%sfdsa", "%s1", "1%sb")

        for value, output in items:

            for pattern in patterns:

                self.check_output(f, pattern % value, pattern % output)

            # Check repeated values.

            self.check_output(f, value * 2, output * 2)

        # Verify it doesn't double replace &.

        self.check_output(f, '<&', '&lt;&amp;')

    def test_linebreaks(self):

        f = html.linebreaks

        items = (

            ("para1\n\npara2\r\rpara3", "<p>para1</p>\n\n<p>para2</p>\n\n<p>para3</p>"),

            ("para1\nsub1\rsub2\n\npara2", "<p>para1<br />sub1<br />sub2</p>\n\n<p>para2</p>"),

            ("para1\r\n\r\npara2\rsub1\r\rpara4", "<p>para1</p>\n\n<p>para2<br />sub1</p>\n\n<p>para4</p>"),

            ("para1\tmore\n\npara2", "<p>para1\tmore</p>\n\n<p>para2</p>"),

        )

        for value, output in items:

            self.check_output(f, value, output)

    def test_strip_tags(self):

        f = html.strip_tags

        items = (

            ('<adf>a', 'a'),

            ('</adf>a', 'a'),

            ('<asdf><asdf>e', 'e'),

            ('<f', '<f'),

            ('</fe', '</fe'),

            ('<x>b<y>', 'b'),

        )

        for value, output in items:

            self.check_output(f, value, output)

    def test_strip_spaces_between_tags(self):

        f = html.strip_spaces_between_tags

        # Strings that should come out untouched.

        items = (' <adf>', '<adf> ', ' </adf> ', ' <f> x</f>')

        for value in items:

            self.check_output(f, value)

        # Strings that have spaces to strip.

        items = (

            ('<d> </d>', '<d></d>'),

            ('<p>hello </p>\n<p> world</p>', '<p>hello </p><p> world</p>'),

            ('\n<p>\t</p>\n<p> </p>\n', '\n<p></p><p></p>\n'),

        )

        for value, output in items:

            self.check_output(f, value, output)

    def test_strip_entities(self):

        f = html.strip_entities

        # Strings that should come out untouched.

        values = ("&", "&a", "&a", "a&#a")

        for value in values:

            self.check_output(f, value)

        # Valid entities that should be stripped from the patterns.

        entities = ("", "", "&a;", "&fdasdfasdfasdf;")

        patterns = (

            ("asdf %(entity)s ", "asdf  "),

            ("%(entity)s%(entity)s", ""),

            ("&%(entity)s%(entity)s", "&"),

            ("%(entity)s3", "3"),

        )

        for entity in entities:

            for in_pattern, output in patterns:

                self.check_output(f, in_pattern % {'entity': entity}, output)

    def test_fix_ampersands(self):

        f = html.fix_ampersands

        # Strings without ampersands or with ampersands already encoded.

        values = ("a", "b", "&a;", "& &x; ", "asdf")

        patterns = (

            ("%s", "%s"),

            ("&%s", "&%s"),

            ("&%s&", "&%s&"),

        )

        for value in values:

            for in_pattern, out_pattern in patterns:

                self.check_output(f, in_pattern % value, out_pattern % value)

        # Strings with ampersands that need encoding.

        items = (

            ("&#;", "&#;"),

            ("&#875 ;", "&#875 ;"),

            ("&#4abc;", "&#4abc;"),

        )

        for value, output in items:

            self.check_output(f, value, output)