mttransforms.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 30 Jun 2015 10:06:00 +0200
changeset 10914 fed8bd56f223
parent 10012 8c2c6fdd8d56
permissions -rw-r--r--
[repository] deprecate the extid2eid based multi-sources API This API is cumbersome and lead to obfuscated code because of the callback mecanism implied when some entity has to be created. Since we dropped the "true" multi-source, this mecanism is not needed anymore and one should prefer to use the dataimport API inside its parser instead. Notice the cwxml parser will trigger the deprecation warning, it should not be used anymore in favor of ad-hoc parsers.

# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
"""mime type transformation engine for cubicweb, based on mtconverter"""

__docformat__ = "restructuredtext en"

from logilab import mtconverter

from logilab.mtconverter.engine import TransformEngine
from logilab.mtconverter.transform import Transform
from logilab.mtconverter import (register_base_transforms,
                                 register_pil_transforms,
                                 register_pygments_transforms)

from cubicweb.utils import UStringIO
from cubicweb.uilib import rest_publish, markdown_publish, html_publish

HTML_MIMETYPES = ('text/html', 'text/xhtml', 'application/xhtml+xml')

# CubicWeb specific transformations

class rest_to_html(Transform):
    inputs = ('text/rest', 'text/x-rst')
    output = 'text/html'
    def _convert(self, trdata):
        return rest_publish(trdata.appobject, trdata.decode())

class markdown_to_html(Transform):
    inputs = ('text/markdown', 'text/x-markdown')
    output = 'text/html'
    def _convert(self, trdata):
        return markdown_publish(trdata.appobject, trdata.decode())

class html_to_html(Transform):
    inputs = HTML_MIMETYPES
    output = 'text/html'
    def _convert(self, trdata):
        return html_publish(trdata.appobject, trdata.data)


# Instantiate and configure the transformation engine

mtconverter.UNICODE_POLICY = 'replace'

ENGINE = TransformEngine()
ENGINE.add_transform(rest_to_html())
ENGINE.add_transform(markdown_to_html())
ENGINE.add_transform(html_to_html())

try:
    from cubicweb.ext.tal import CubicWebContext, compile_template
except ImportError:
    HAS_TAL = False
    from cubicweb import schema
    schema.NEED_PERM_FORMATS.remove('text/cubicweb-page-template')

else:
    HAS_TAL = True

    class ept_to_html(Transform):
        inputs = ('text/cubicweb-page-template',)
        output = 'text/html'
        output_encoding = 'utf-8'
        def _convert(self, trdata):
            context = CubicWebContext()
            appobject = trdata.appobject
            context.update({'self': appobject, 'rset': appobject.cw_rset,
                            'req': appobject._cw,
                            '_' : appobject._cw._,
                            'user': appobject._cw.user})
            output = UStringIO()
            template = compile_template(trdata.encode(self.output_encoding))
            template.expand(context, output)
            return output.getvalue()

    ENGINE.add_transform(ept_to_html())

if register_pil_transforms(ENGINE, verb=False):
    HAS_PIL_TRANSFORMS = True
else:
    HAS_PIL_TRANSFORMS = False

try:
    from logilab.mtconverter.transforms import pygmentstransforms
    for mt in ('text/plain',) + HTML_MIMETYPES:
        try:
            pygmentstransforms.mimetypes.remove(mt)
        except ValueError:
            continue
    register_pygments_transforms(ENGINE, verb=False)

    def patch_convert(cls):
        def _convert(self, trdata, origconvert=cls._convert):
            add_css = getattr(trdata.appobject._cw, 'add_css', None)
            if add_css is not None:
                # session has no add_css, only http request
                add_css('pygments.css')
            return origconvert(self, trdata)
        cls._convert = _convert
    patch_convert(pygmentstransforms.PygmentsHTMLTransform)

    HAS_PYGMENTS_TRANSFORMS = True
except ImportError:
    HAS_PYGMENTS_TRANSFORMS = False

register_base_transforms(ENGINE, verb=False)