common/html4zope.py
author sylvain.thenault@logilab.fr
Thu, 14 May 2009 12:49:44 +0200
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# Author: David Goodger
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# Contact: goodger@users.sourceforge.net
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# Revision: $Revision: 1.2 $
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# Date: $Date: 2005-07-04 16:36:50 $
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# Copyright: This module has been placed in the public domain.
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"""
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Simple HyperText Markup Language document tree Writer.
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The output conforms to the HTML 4.01 Transitional DTD and to the Extensible
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HTML version 1.0 Transitional DTD (*almost* strict).  The output contains a
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minimum of formatting information.  A cascading style sheet ("default.css" by
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default) is required for proper viewing with a modern graphical browser.
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http://cvs.zope.org/Zope/lib/python/docutils/writers/Attic/html4zope.py?rev=1.1.2.2&only_with_tag=ajung-restructuredtext-integration-branch&content-type=text/vnd.viewcvs-markup
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"""
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__docformat__ = 'reStructuredText'
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from logilab.mtconverter import html_escape
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from docutils import nodes
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from docutils.writers.html4css1 import Writer as CSS1Writer
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from docutils.writers.html4css1 import HTMLTranslator as CSS1HTMLTranslator
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import os
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default_level = int(os.environ.get('STX_DEFAULT_LEVEL', 3))
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class Writer(CSS1Writer):
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    """css writer using our html translator"""
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    def __init__(self, base_url):
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        CSS1Writer.__init__(self)
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        self.translator_class = URLBinder(base_url, HTMLTranslator)
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    def apply_template(self):
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        """overriding this is necessary with docutils >= 0.5"""
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        return self.visitor.astext()
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class URLBinder:
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    def __init__(self, url, klass):
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        self.base_url = url
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        self.translator_class = HTMLTranslator
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    def __call__(self, document):
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        translator = self.translator_class(document)
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        translator.base_url = self.base_url
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        return translator
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class HTMLTranslator(CSS1HTMLTranslator):
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    """ReST tree to html translator"""
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    def astext(self):
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        """return the extracted html"""
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        return ''.join(self.body)
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    def visit_title(self, node):
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        """Only 6 section levels are supported by HTML."""
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        if isinstance(node.parent, nodes.topic):
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            self.body.append(
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                  self.starttag(node, 'p', '', CLASS='topic-title'))
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            if node.parent.hasattr('id'):
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                self.body.append(
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                    self.starttag({}, 'a', '', name=node.parent['id']))
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                self.context.append('</a></p>\n')
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            else:
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                self.context.append('</p>\n')
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        elif self.section_level == 0:
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            # document title
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            self.head.append('<title>%s</title>\n'
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                             % self.encode(node.astext()))
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            self.body.append(self.starttag(node, 'h%d' % default_level, '',
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                                           CLASS='title'))
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            self.context.append('</h%d>\n' % default_level)
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        else:
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            self.body.append(
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                  self.starttag(node, 'h%s' % (
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                default_level+self.section_level-1), ''))
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            atts = {}
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            if node.hasattr('refid'):
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                atts['class'] = 'toc-backref'
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                atts['href'] = '%s#%s' % (self.base_url, node['refid'])
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            self.body.append(self.starttag({}, 'a', '', **atts))
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            self.context.append('</a></h%s>\n' % (
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                default_level+self.section_level-1))
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    def visit_subtitle(self, node):
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        """format a subtitle"""
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        if isinstance(node.parent, nodes.sidebar):
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            self.body.append(self.starttag(node, 'p', '',
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                                           CLASS='sidebar-subtitle'))
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            self.context.append('</p>\n')
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        else:
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            self.body.append(
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                  self.starttag(node, 'h%s' % (default_level+1), '',
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                                CLASS='subtitle'))
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            self.context.append('</h%s>\n' % (default_level+1))
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    def visit_document(self, node):
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        """syt: i don't want the enclosing <div class="document">"""
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    def depart_document(self, node):
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        """syt: i don't want the enclosing <div class="document">"""
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    def visit_reference(self, node):
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        """syt: i want absolute urls"""
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        if node.has_key('refuri'):
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            href = node['refuri']
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            if ( self.settings.cloak_email_addresses
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                 and href.startswith('mailto:')):
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                href = self.cloak_mailto(href)
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                self.in_mailto = 1
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        else:
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            assert node.has_key('refid'), \
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                   'References must have "refuri" or "refid" attribute.'
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            href = '%s#%s' % (self.base_url, node['refid'])
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        atts = {'href': href, 'class': 'reference'}
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        if not isinstance(node.parent, nodes.TextElement):
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            assert len(node) == 1 and isinstance(node[0], nodes.image)
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            atts['class'] += ' image-reference'
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        self.body.append(self.starttag(node, 'a', '', **atts))
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    ## override error messages to avoid XHTML problems ########################
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    def visit_problematic(self, node):
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        pass
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    def depart_problematic(self, node):
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        pass
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    def visit_system_message(self, node):
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        backref_text = ''
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        if len(node['backrefs']):
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            backrefs = node['backrefs']
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            if len(backrefs) == 1:
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                backref_text = '; <em>backlink</em>'
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            else:
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                i = 1
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                backlinks = []
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                for backref in backrefs:
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                    backlinks.append(str(i))
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                    i += 1
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                backref_text = ('; <em>backlinks: %s</em>'
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                                % ', '.join(backlinks))
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        if node.hasattr('line'):
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            line = ', line %s' % node['line']
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        else:
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            line = ''
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        a_start = a_end = ''
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        error = u'System Message: %s%s/%s%s (%s %s)%s</p>\n' % (
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            a_start, node['type'], node['level'], a_end,
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            self.encode(node['source']), line, backref_text)
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        self.body.append(u'<div class="system-message"><b>ReST / HTML errors:</b>%s</div>' % html_escape(error))
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    def depart_system_message(self, node):
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        pass