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/usr/lib/python2.7/dist-packages/markupfield/markup.py is in python-django-markupfield 1.4.0-1.

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from django.utils.html import escape, linebreaks, urlize
from django.utils.functional import curry
from django.utils.translation import pgettext_lazy as _
from django.conf import settings

# build DEFAULT_MARKUP_TYPES
DEFAULT_MARKUP_TYPES = [
    ('html', lambda markup: markup,
     _('django-markupfield', 'HTML')),
    ('plain', lambda markup: linebreaks(urlize(escape(markup))),
     _('django-markupfield', 'Plain')),
]

try:
    import pygments     # noqa
    PYGMENTS_INSTALLED = True

    def _register_pygments_rst_directive():
        from docutils import nodes
        from docutils.parsers.rst import directives
        from pygments import highlight
        from pygments.lexers import get_lexer_by_name, TextLexer
        from pygments.formatters import HtmlFormatter

        DEFAULT = HtmlFormatter()
        VARIANTS = {
            'linenos': HtmlFormatter(linenos=True),
        }

        def pygments_directive(name, arguments, options, content, lineno,
                               content_offset, block_text, state,
                               state_machine):
            try:
                lexer = get_lexer_by_name(arguments[0])
            except ValueError:
                # no lexer found - use the text one instead of an exception
                lexer = TextLexer()
            formatter = options and VARIANTS[options.keys()[0]] or DEFAULT
            parsed = highlight(u'\n'.join(content), lexer, formatter)
            return [nodes.raw('', parsed, format='html')]
        pygments_directive.arguments = (1, 0, 1)
        pygments_directive.content = 1
        directives.register_directive('code', pygments_directive)

except ImportError:
    PYGMENTS_INSTALLED = False

try:
    import markdown

    md_filter = markdown.markdown

    # try and replace if pygments & codehilite are available
    if PYGMENTS_INSTALLED:
        try:
            from markdown.extensions.codehilite import makeExtension   # noqa
            md_filter = curry(markdown.markdown,
                              extensions=[makeExtension(css_class='highlight')])
        except ImportError:
            pass

    # whichever markdown_filter was available
    DEFAULT_MARKUP_TYPES.append(('markdown', md_filter,
                                 _('django-markupfield', 'Markdown')))

except ImportError:
    pass

try:
    from docutils.core import publish_parts

    if PYGMENTS_INSTALLED:
        _register_pygments_rst_directive()

    def render_rest(markup):
        overrides = getattr(settings, "RESTRUCTUREDTEXT_FILTER_SETTINGS", {})
        overrides.update({
            'raw_enabled': False,
            'file_insertion_enabled': False,
        })
        parts = publish_parts(source=markup, writer_name="html4css1",
                              settings_overrides=overrides)
        return parts["fragment"]

    DEFAULT_MARKUP_TYPES.append(('restructuredtext', render_rest,
                                 _('django-markupfield', 'Restructured Text')))
except ImportError:
    pass