ext/rest.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 17 Jun 2010 15:15:52 +0200
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child 6109 47d9c0e0f7b7
permissions -rw-r--r--
backport stable
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""rest publishing functions
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contains some functions and setup of docutils for cubicweb. Provides the
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following ReST directives:
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* `eid`, create link to entity in the repository by their eid
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* `card`, create link to card entity in the repository by their wikiid
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  (proposing to create it when the refered card doesn't exist yet)
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* `winclude`, reference to a web documentation file (in wdoc/ directories)
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* `sourcecode` (if pygments is installed), source code colorization
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"""
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__docformat__ = "restructuredtext en"
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from cStringIO import StringIO
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from itertools import chain
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from logging import getLogger
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from os.path import join
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from docutils import statemachine, nodes, utils, io
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from docutils.core import Publisher
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from docutils.parsers.rst import Parser, states, directives
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from docutils.parsers.rst.roles import register_canonical_role, set_classes
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from logilab.mtconverter import ESC_UCAR_TABLE, ESC_CAR_TABLE, xml_escape
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from cubicweb import UnknownEid
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from cubicweb.ext.html4zope import Writer
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# We provide our own parser as an attempt to get rid of
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# state machine reinstanciation
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import re
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# compile states.Body patterns
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for k, v in states.Body.patterns.items():
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    if isinstance(v, str):
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        states.Body.patterns[k] = re.compile(v)
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# register ReStructured Text mimetype / extensions
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import mimetypes
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mimetypes.add_type('text/rest', '.rest')
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mimetypes.add_type('text/rest', '.rst')
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LOGGER = getLogger('cubicweb.rest')
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def eid_reference_role(role, rawtext, text, lineno, inliner,
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                       options={}, content=[]):
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    try:
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        try:
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            eid_num, rest = text.split(u':', 1)
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        except:
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            eid_num, rest = text, '#'+text
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        eid_num = int(eid_num)
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        if eid_num < 0:
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            raise ValueError
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    except ValueError:
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        msg = inliner.reporter.error(
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            'EID number must be a positive number; "%s" is invalid.'
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            % text, line=lineno)
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        prb = inliner.problematic(rawtext, rawtext, msg)
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        return [prb], [msg]
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    # Base URL mainly used by inliner.pep_reference; so this is correct:
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    context = inliner.document.settings.context
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    try:
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        refedentity = context._cw.entity_from_eid(eid_num)
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    except UnknownEid:
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        ref = '#'
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        rest += u' ' + context._cw._('(UNEXISTANT EID)')
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    else:
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        ref = refedentity.absolute_url()
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    set_classes(options)
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    return [nodes.reference(rawtext, utils.unescape(rest), refuri=ref,
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                            **options)], []
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def winclude_directive(name, arguments, options, content, lineno,
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                       content_offset, block_text, state, state_machine):
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    """Include a reST file as part of the content of this reST file.
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    same as standard include directive but using config.locate_doc_resource to
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    get actual file to include.
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    Most part of this implementation is copied from `include` directive defined
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    in `docutils.parsers.rst.directives.misc`
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    """
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    context = state.document.settings.context
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    cw = context._cw
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    source = state_machine.input_lines.source(
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        lineno - state_machine.input_offset - 1)
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    #source_dir = os.path.dirname(os.path.abspath(source))
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    fid = arguments[0]
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    for lang in chain((cw.lang, cw.vreg.property_value('ui.language')),
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                      cw.vreg.config.available_languages()):
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        rid = '%s_%s.rst' % (fid, lang)
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        resourcedir = cw.vreg.config.locate_doc_file(rid)
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        if resourcedir:
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            break
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    else:
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        severe = state_machine.reporter.severe(
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              'Problems with "%s" directive path:\nno resource matching %s.'
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              % (name, fid),
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              nodes.literal_block(block_text, block_text), line=lineno)
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        return [severe]
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   125
    path = join(resourcedir, rid)
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    encoding = options.get('encoding', state.document.settings.input_encoding)
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    try:
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        state.document.settings.record_dependencies.add(path)
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        include_file = io.FileInput(
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            source_path=path, encoding=encoding,
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   131
            error_handler=state.document.settings.input_encoding_error_handler,
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            handle_io_errors=None)
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   133
    except IOError, error:
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   134
        severe = state_machine.reporter.severe(
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   135
              'Problems with "%s" directive path:\n%s: %s.'
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   136
              % (name, error.__class__.__name__, error),
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   137
              nodes.literal_block(block_text, block_text), line=lineno)
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   138
        return [severe]
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   139
    try:
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   140
        include_text = include_file.read()
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diff changeset
   141
    except UnicodeError, error:
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   142
        severe = state_machine.reporter.severe(
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diff changeset
   143
              'Problem with "%s" directive:\n%s: %s'
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   144
              % (name, error.__class__.__name__, error),
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   145
              nodes.literal_block(block_text, block_text), line=lineno)
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   146
        return [severe]
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   147
    if options.has_key('literal'):
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   148
        literal_block = nodes.literal_block(include_text, include_text,
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   149
                                            source=path)
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   150
        literal_block.line = 1
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   151
        return literal_block
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   152
    else:
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   153
        include_lines = statemachine.string2lines(include_text,
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                                                  convert_whitespace=1)
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   155
        state_machine.insert_input(include_lines, path)
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   156
        return []
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   157
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   158
winclude_directive.arguments = (1, 0, 1)
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   159
winclude_directive.options = {'literal': directives.flag,
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   160
                              'encoding': directives.encoding}
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diff changeset
   161
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   162
try:
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   163
    from pygments import highlight
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   164
    from pygments.lexers import get_lexer_by_name
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   165
    from pygments.formatters import HtmlFormatter
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   166
except ImportError:
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   167
    pygments_directive = None
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   168
else:
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   169
    _PYGMENTS_FORMATTER = HtmlFormatter()
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   170
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   171
    def pygments_directive(name, arguments, options, content, lineno,
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   172
                           content_offset, block_text, state, state_machine):
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diff changeset
   173
        try:
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diff changeset
   174
            lexer = get_lexer_by_name(arguments[0])
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   175
        except ValueError:
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   176
            # no lexer found
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   177
            lexer = get_lexer_by_name('text')
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   178
        parsed = highlight(u'\n'.join(content), lexer, _PYGMENTS_FORMATTER)
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diff changeset
   179
        # don't fail if no context set on the sourcecode directive
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diff changeset
   180
        try:
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diff changeset
   181
            context = state.document.settings.context
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   182
            context._cw.add_css('pygments.css')
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diff changeset
   183
        except AttributeError:
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diff changeset
   184
            # used outside cubicweb
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   185
            pass
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diff changeset
   186
        return [nodes.raw('', parsed, format='html')]
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diff changeset
   187
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diff changeset
   188
    pygments_directive.arguments = (1, 0, 1)
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   189
    pygments_directive.content = 1
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   190
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   191
0
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   192
class CubicWebReSTParser(Parser):
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   193
    """The (customized) reStructuredText parser."""
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   194
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   195
    def __init__(self):
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   196
        self.initial_state = 'Body'
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   197
        self.state_classes = states.state_classes
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   198
        self.inliner = states.Inliner()
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   199
        self.statemachine = states.RSTStateMachine(
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   200
              state_classes=self.state_classes,
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   201
              initial_state=self.initial_state,
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   202
              debug=0)
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diff changeset
   203
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   204
    def parse(self, inputstring, document):
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   205
        """Parse `inputstring` and populate `document`, a document tree."""
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diff changeset
   206
        self.setup_parse(inputstring, document)
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diff changeset
   207
        inputlines = statemachine.string2lines(inputstring,
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diff changeset
   208
                                               convert_whitespace=1)
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diff changeset
   209
        self.statemachine.run(inputlines, document, inliner=self.inliner)
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diff changeset
   210
        self.finish_parse()
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diff changeset
   211
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diff changeset
   212
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e27d23f875c6 custom rest publisher instead of using rest_publish. Avoid to keep a ref on the latest context
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diff changeset
   213
# XXX docutils keep a ref on context, can't find a correct way to remove it
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diff changeset
   214
class CWReSTPublisher(Publisher):
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diff changeset
   215
    def __init__(self, context, settings, **kwargs):
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diff changeset
   216
        Publisher.__init__(self, **kwargs)
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diff changeset
   217
        self.set_components('standalone', 'restructuredtext', 'pseudoxml')
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diff changeset
   218
        self.process_programmatic_settings(None, settings, None)
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diff changeset
   219
        self.settings.context = context
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   220
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diff changeset
   221
0
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diff changeset
   222
def rest_publish(context, data):
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diff changeset
   223
    """publish a string formatted as ReStructured Text to HTML
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diff changeset
   224
0
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diff changeset
   225
    :type context: a cubicweb application object
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diff changeset
   226
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   227
    :type data: str
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diff changeset
   228
    :param data: some ReST text
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diff changeset
   229
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   230
    :rtype: unicode
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diff changeset
   231
    :return:
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   232
      the data formatted as HTML or the original data if an error occured
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parents:
diff changeset
   233
    """
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7b49fa7e942d [api] use _cw, cw_row, cw_col, cw_rset etc.
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diff changeset
   234
    req = context._cw
0
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diff changeset
   235
    if isinstance(data, unicode):
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diff changeset
   236
        encoding = 'unicode'
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diff changeset
   237
        # remove unprintable characters unauthorized in xml
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diff changeset
   238
        data = data.translate(ESC_UCAR_TABLE)
0
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diff changeset
   239
    else:
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   240
        encoding = req.encoding
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diff changeset
   241
        # remove unprintable characters unauthorized in xml
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diff changeset
   242
        data = data.translate(ESC_CAR_TABLE)
0
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diff changeset
   243
    settings = {'input_encoding': encoding, 'output_encoding': 'unicode',
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e27d23f875c6 custom rest publisher instead of using rest_publish. Avoid to keep a ref on the latest context
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diff changeset
   244
                'warning_stream': StringIO(),
0
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parents:
diff changeset
   245
                # dunno what's the max, severe is 4, and we never want a crash
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parents:
diff changeset
   246
                # (though try/except may be a better option...)
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a1ca676294f0 don't use a singleton rest parser which may leads to concurrency bugs
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parents: 1323
diff changeset
   247
                'halt_level': 10,
0
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parents:
diff changeset
   248
                }
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parents:
diff changeset
   249
    if context:
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diff changeset
   250
        if hasattr(req, 'url'):
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diff changeset
   251
            base_url = req.url()
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diff changeset
   252
        elif hasattr(context, 'absolute_url'):
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parents:
diff changeset
   253
            base_url = context.absolute_url()
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        else:
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            base_url = req.base_url()
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    else:
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        base_url = None
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    try:
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        pub = CWReSTPublisher(context, settings,
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                              parser=CubicWebReSTParser(),
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                              writer=Writer(base_url=base_url),
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                              source_class=io.StringInput,
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                              destination_class=io.StringOutput)
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        pub.set_source(data)
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        pub.set_destination()
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        res = pub.publish(enable_exit_status=None)
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        # necessary for proper garbage collection, else a ref is kept somewhere in docutils...
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        del pub.settings.context
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        return res
0
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    except Exception:
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        LOGGER.exception('error while publishing ReST text')
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        if not isinstance(data, unicode):
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            data = unicode(data, encoding, 'replace')
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        return xml_escape(req._('error while publishing ReST text')
0
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                           + '\n\n' + data)
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_INITIALIZED = False
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def cw_rest_init():
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    global _INITIALIZED
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    if _INITIALIZED:
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        return
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    _INITIALIZED = True
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    register_canonical_role('eid', eid_reference_role)
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    directives.register_directive('winclude', winclude_directive)
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    if pygments_directive is not None:
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        directives.register_directive('sourcecode', pygments_directive)