Method test_strings

Lib/test/test_tools/test_msgfmt.py:154–241

(self)

        msgfmt.MESSAGES.clear()

    def test_strings(self):
        # Test that the PO parser correctly handles and unescape
        # strings in the PO file.
        # The PO file format allows for a variety of escape sequences,
        # octal and hex escapes.
        valid_strings = (
            # empty strings
            ('""', ''),
            ('"" "" ""', ''),
            # allowed escape sequences
            (r'"\\"', '\\'),
            (r'"\""', '"'),
            (r'"\t"', '\t'),
            (r'"\n"', '\n'),
            (r'"\r"', '\r'),
            (r'"\f"', '\f'),
            (r'"\a"', '\a'),
            (r'"\b"', '\b'),
            (r'"\v"', '\v'),
            # non-empty strings
            ('"foo"', 'foo'),
            ('"foo" "bar"', 'foobar'),
            ('"foo""bar"', 'foobar'),
            ('"" "foo" ""', 'foo'),
            # newlines and tabs
            (r'"foo\nbar"', 'foo\nbar'),
            (r'"foo\n" "bar"', 'foo\nbar'),
            (r'"foo\tbar"', 'foo\tbar'),
            (r'"foo\t" "bar"', 'foo\tbar'),
            # escaped quotes
            (r'"foo\"bar"', 'foo"bar'),
            (r'"foo\"" "bar"', 'foo"bar'),
            (r'"foo\\" "bar"', 'foo\\bar'),
            # octal escapes
            (r'"\120\171\164\150\157\156"', 'Python'),
            (r'"\120\171\164" "\150\157\156"', 'Python'),
            (r'"\"\120\171\164" "\150\157\156\""', '"Python"'),
            # hex escapes
            (r'"\x50\x79\x74\x68\x6f\x6e"', 'Python'),
            (r'"\x50\x79\x74" "\x68\x6f\x6e"', 'Python'),
            (r'"\"\x50\x79\x74" "\x68\x6f\x6e\""', '"Python"'),
        )

        with temp_cwd():
            for po_string, expected in valid_strings:
                with self.subTest(po_string=po_string):
                    # Construct a PO file with a single entry,
                    # compile it, read it into a catalog and
                    # check the result.
                    po = f'msgid {po_string}\nmsgstr "translation"'
                    Path('messages.po').write_text(po)
                    # Reset the global MESSAGES dictionary
                    msgfmt.MESSAGES.clear()
                    msgfmt.make('messages.po', 'messages.mo')

                    with open('messages.mo', 'rb') as f:
                        actual = GNUTranslations(f)