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_html_base.py
#!/usr/bin/env python # -*- coding: utf-8 -*- # :Author: David Goodger, Günter Milde # Based on the html4css1 writer by David Goodger. # :Maintainer: docutils-develop@lists.sourceforge.net # :Revision: $Revision: 8644 $ # :Date: $Date: 2005-06-28$ # :Copyright: © 2016 David Goodger, Günter Milde # :License: Released under the terms of the `2-Clause BSD license`_, in short: # # Copying and distribution of this file, with or without modification, # are permitted in any medium without royalty provided the copyright # notice and this notice are preserved. # This file is offered as-is, without any warranty. # # .. _2-Clause BSD license: https://opensource.org/licenses/BSD-2-Clause """common definitions for Docutils HTML writers""" import base64 import mimetypes import os, os.path import re import sys try: # check for the Python Imaging Library import PIL.Image except ImportError: try: # sometimes PIL modules are put in PYTHONPATH's root import Image class PIL(object): pass # dummy wrapper PIL.Image = Image except ImportError: PIL = None import docutils from docutils import nodes, utils, writers, languages, io from docutils.utils.error_reporting import SafeString from docutils.transforms import writer_aux from docutils.utils.math import (unichar2tex, pick_math_environment, math2html, latex2mathml, tex2mathml_extern) if sys.version_info >= (3, 0): from urllib.request import url2pathname else: from urllib import url2pathname if sys.version_info >= (3, 0): unicode = str # noqa class Writer(writers.Writer): supported = ('html', 'xhtml') # update in subclass """Formats this writer supports.""" # default_stylesheets = [] # set in subclass! # default_stylesheet_dirs = ['.'] # set in subclass! default_template = 'template.txt' # default_template_path = ... # set in subclass! # settings_spec = ... # set in subclass! settings_defaults = {'output_encoding_error_handler': 'xmlcharrefreplace'} # config_section = ... # set in subclass! config_section_dependencies = ('writers', 'html writers') visitor_attributes = ( 'head_prefix', 'head', 'stylesheet', 'body_prefix', 'body_pre_docinfo', 'docinfo', 'body', 'body_suffix', 'title', 'subtitle', 'header', 'footer', 'meta', 'fragment', 'html_prolog', 'html_head', 'html_title', 'html_subtitle', 'html_body') def get_transforms(self): return writers.Writer.get_transforms(self) + [writer_aux.Admonitions] def translate(self): self.visitor = visitor = self.translator_class(self.document) self.document.walkabout(visitor) for attr in self.visitor_attributes: setattr(self, attr, getattr(visitor, attr)) self.output = self.apply_template() def apply_template(self): template_file = open(self.document.settings.template, 'rb') template = unicode(template_file.read(), 'utf-8') template_file.close() subs = self.interpolation_dict() return template % subs def interpolation_dict(self): subs = {} settings = self.document.settings for attr in self.visitor_attributes: subs[attr] = ''.join(getattr(self, attr)).rstrip('\n') subs['encoding'] = settings.output_encoding subs['version'] = docutils.__version__ return subs def assemble_parts(self): writers.Writer.assemble_parts(self) for part in self.visitor_attributes: self.parts[part] = ''.join(getattr(self, part)) class HTMLTranslator(nodes.NodeVisitor): """ Generic Docutils to HTML translator. See the `html4css1` and `html5_polyglot` writers for full featured HTML writers. .. IMPORTANT:: The `visit_*` and `depart_*` methods use a heterogeneous stack, `self.context`. When subclassing, make sure to be consistent in its use! Examples for robust coding: a) Override both `visit_*` and `depart_*` methods, don't call the parent functions. b) Extend both and unconditionally call the parent functions:: def visit_example(self, node): if foo: self.body.append('<div class="foo">') html4css1.HTMLTranslator.visit_example(self, node) def depart_example(self, node): html4css1.HTMLTranslator.depart_example(self, node) if foo: self.body.append('</div>') c) Extend both, calling the parent functions under the same conditions:: def visit_example(self, node): if foo: self.body.append('<div class="foo">\n') else: # call the parent method _html_base.HTMLTranslator.visit_example(self, node) def depart_example(self, node): if foo: self.body.append('</div>\n') else: # call the parent method _html_base.HTMLTranslator.depart_example(self, node) d) Extend one method (call the parent), but don't otherwise use the `self.context` stack:: def depart_example(self, node): _html_base.HTMLTranslator.depart_example(self, node) if foo: # implementation-specific code # that does not use `self.context` self.body.append('</div>\n') This way, changes in stack use will not bite you. """ xml_declaration = '<?xml version="1.0" encoding="%s" ?>\n' doctype = '<!DOCTYPE html>\n' doctype_mathml = doctype head_prefix_template = ('<html xmlns="http://www.w3.org/1999/xhtml"' ' xml:lang="%(lang)s" lang="%(lang)s">\n<head>\n') content_type = '<meta charset="%s"/>\n' generator = ('<meta name="generator" content="Docutils %s: ' 'http://docutils.sourceforge.net/" />\n') # Template for the MathJax script in the header: mathjax_script = '<script type="text/javascript" src="%s"></script>\n' mathjax_url = 'file:/usr/share/javascript/mathjax/MathJax.js' """ URL of the MathJax javascript library. The MathJax library ought to be installed on the same server as the rest of the deployed site files and specified in the `math-output` setting appended to "mathjax". See `Docutils Configuration`__. __ http://docutils.sourceforge.net/docs/user/config.html#math-output The fallback tries a local MathJax installation at ``/usr/share/javascript/mathjax/MathJax.js``. """ stylesheet_link = '<link rel="stylesheet" href="%s" type="text/css" />\n' embedded_stylesheet = '<style type="text/css">\n\n%s\n</style>\n' words_and_spaces = re.compile(r'[^ \n]+| +|\n') # wrap point inside word: in_word_wrap_point = re.compile(r'.+\W\W.+|[-?].+', re.U) lang_attribute = 'lang' # name changes to 'xml:lang' in XHTML 1.1 special_characters = {ord('&'): u'&', ord('<'): u'<', ord('"'): u'"', ord('>'): u'>', ord('@'): u'@', # may thwart address harvesters } """Character references for characters with a special meaning in HTML.""" def __init__(self, document): nodes.NodeVisitor.__init__(self, document) self.settings = settings = document.settings lcode = settings.language_code self.language = languages.get_language(lcode, document.reporter) self.meta = [self.generator % docutils.__version__] self.head_prefix = [] self.html_prolog = [] if settings.xml_declaration: self.head_prefix.append(self.xml_declaration % settings.output_encoding) # self.content_type = "" # encoding not interpolated: self.html_prolog.append(self.xml_declaration) self.head = self.meta[:] self.stylesheet = [self.stylesheet_call(path) for path in utils.get_stylesheet_list(settings)] self.body_prefix = ['</head>\n<body>\n'] # document title, subtitle display self.body_pre_docinfo = [] # author, date, etc. self.docinfo = [] self.body = [] self.fragment = [] self.body_suffix = ['</body>\n</html>\n'] self.section_level = 0 self.initial_header_level = int(settings.initial_header_level) self.math_output = settings.math_output.split() self.math_output_options = self.math_output[1:] self.math_output = self.math_output[0].lower() self.context = [] """Heterogeneous stack. Used by visit_* and depart_* functions in conjunction with the tree traversal. Make sure that the pops correspond to the pushes.""" self.topic_classes = [] self.colspecs = [] self.compact_p = True self.compact_simple = False self.compact_field_list = False self.in_docinfo = False self.in_sidebar = False self.in_footnote_list = False self.title = [] self.subtitle = [] self.header = [] self.footer = [] self.html_head = [self.content_type] # charset not interpolated self.html_title = [] self.html_subtitle = [] self.html_body = [] self.in_document_title = 0 # len(self.body) or 0 self.in_mailto = False self.author_in_authors = False # for html4css1 self.math_header = [] def astext(self): return ''.join(self.head_prefix + self.head + self.stylesheet + self.body_prefix + self.body_pre_docinfo + self.docinfo + self.body + self.body_suffix) def encode(self, text): """Encode special characters in `text` & return.""" # Use only named entities known in both XML and HTML # other characters are automatically encoded "by number" if required. # @@@ A codec to do these and all other HTML entities would be nice. text = unicode(text) return text.translate(self.special_characters) def cloak_mailto(self, uri): """Try to hide a mailto: URL from harvesters.""" # Encode "@" using a URL octet reference (see RFC 1738). # Further cloaking with HTML entities will be done in the # `attval` function. return uri.replace('@', '%40') def cloak_email(self, addr): """Try to hide the link text of a email link from harversters.""" # Surround at-signs and periods with <span> tags. ("@" has # already been encoded to "@" by the `encode` method.) addr = addr.replace('@', '<span>@</span>') addr = addr.replace('.', '<span>.</span>') return addr def attval(self, text, whitespace=re.compile('[\n\r\t\v\f]')): """Cleanse, HTML encode, and return attribute value text.""" encoded = self.encode(whitespace.sub(' ', text)) if self.in_mailto and self.settings.cloak_email_addresses: # Cloak at-signs ("%40") and periods with HTML entities. encoded = encoded.replace('%40', '%40') encoded = encoded.replace('.', '.') return encoded def stylesheet_call(self, path): """Return code to reference or embed stylesheet file `path`""" if self.settings.embed_stylesheet: try: content = io.FileInput(source_path=path, encoding='utf-8').read() self.settings.record_dependencies.add(path) except IOError as err: msg = u"Cannot embed stylesheet '%r': %s." % ( path, SafeString(err.strerror)) self.document.reporter.error(msg) return '<--- %s --->\n' % msg return self.embedded_stylesheet % content # else link to style file: if self.settings.stylesheet_path: # adapt path relative to output (cf. config.html#stylesheet-path) path = utils.relative_path(self.settings._destination, path) return self.stylesheet_link % self.encode(path) def starttag(self, node, tagname, suffix='\n', empty=False, **attributes): """ Construct and return a start tag given a node (id & class attributes are extracted), tag name, and optional attributes. """ tagname = tagname.lower() prefix = [] atts = {} ids = [] for (name, value) in attributes.items(): atts[name.lower()] = value classes = [] languages = [] # unify class arguments and move language specification for cls in node.get('classes', []) + atts.pop('class', '').split(): if cls.startswith('language-'): languages.append(cls[9:]) elif cls.strip() and cls not in classes: classes.append(cls) if languages: # attribute name is 'lang' in XHTML 1.0 but 'xml:lang' in 1.1 atts[self.lang_attribute] = languages[0] if classes: atts['class'] = ' '.join(classes) assert 'id' not in atts ids.extend(node.get('ids', [])) if 'ids' in atts: ids.extend(atts['ids']) del atts['ids'] if ids: atts['id'] = ids[0] for id in ids[1:]: # Add empty "span" elements for additional IDs. Note # that we cannot use empty "a" elements because there # may be targets inside of references, but nested "a" # elements aren't allowed in XHTML (even if they do # not all have a "href" attribute). if empty or isinstance(node, (nodes.bullet_list, nodes.docinfo, nodes.definition_list, nodes.enumerated_list, nodes.field_list, nodes.option_list, nodes.table)): # Insert target right in front of element. prefix.append('<span id="%s"></span>' % id) else: # Non-empty tag. Place the auxiliary <span> tag # *inside* the element, as the first child. suffix += '<span id="%s"></span>' % id attlist = sorted(atts.items()) parts = [tagname] for name, value in attlist: # value=None was used for boolean attributes without # value, but this isn't supported by XHTML. assert value is not None if isinstance(value, list): values = [unicode(v) for v in value] parts.append('%s="%s"' % (name.lower(), self.attval(' '.join(values)))) else: parts.append('%s="%s"' % (name.lower(), self.attval(unicode(value)))) if empty: infix = ' /' else: infix = '' return ''.join(prefix) + '<%s%s>' % (' '.join(parts), infix) + suffix def emptytag(self, node, tagname, suffix='\n', **attributes): """Construct and return an XML-compatible empty tag.""" return self.starttag(node, tagname, suffix, empty=True, **attributes) def set_class_on_child(self, node, class_, index=0): """ Set class `class_` on the visible child no. index of `node`. Do nothing if node has fewer children than `index`. """ children = [n for n in node if not isinstance(n, nodes.Invisible)] try: child = children[index] except IndexError: return child['classes'].append(class_) def visit_Text(self, node): text = node.astext() encoded = self.encode(text) if self.in_mailto and self.settings.cloak_email_addresses: encoded = self.cloak_email(encoded) self.body.append(encoded) def depart_Text(self, node): pass def visit_abbreviation(self, node): # @@@ implementation incomplete ("title" attribute) self.body.append(self.starttag(node, 'abbr', '')) def depart_abbreviation(self, node): self.body.append('</abbr>') def visit_acronym(self, node): # @@@ implementation incomplete ("title" attribute) self.body.append(self.starttag(node, 'acronym', '')) def depart_acronym(self, node): self.body.append('</acronym>') def visit_address(self, node): self.visit_docinfo_item(node, 'address', meta=False) self.body.append(self.starttag(node, 'pre', suffix= '', CLASS='address')) def depart_address(self, node): self.body.append('\n</pre>\n') self.depart_docinfo_item() def visit_admonition(self, node): node['classes'].insert(0, 'admonition') self.body.append(self.starttag(node, 'div')) def depart_admonition(self, node=None): self.body.append('</div>\n') attribution_formats = {'dash': (u'\u2014', ''), 'parentheses': ('(', ')'), 'parens': ('(', ')'), 'none': ('', '')} def visit_attribution(self, node): prefix, suffix = self.attribution_formats[self.settings.attribution] self.context.append(suffix) self.body.append( self.starttag(node, 'p', prefix, CLASS='attribution')) def depart_attribution(self, node): self.body.append(self.context.pop() + '</p>\n') def visit_author(self, node): if not(isinstance(node.parent, nodes.authors)): self.visit_docinfo_item(node, 'author') self.body.append('<p>') def depart_author(self, node): self.body.append('</p>') if isinstance(node.parent, nodes.authors): self.body.append('\n') else: self.depart_docinfo_item() def visit_authors(self, node): self.visit_docinfo_item(node, 'authors') def depart_authors(self, node): self.depart_docinfo_item() def visit_block_quote(self, node): self.body.append(self.starttag(node, 'blockquote')) def depart_block_quote(self, node): self.body.append('</blockquote>\n') def check_simple_list(self, node): """Check for a simple list that can be rendered compactly.""" visitor = SimpleListChecker(self.document) try: node.walk(visitor) except nodes.NodeFound: return False else: return True # Compact lists # ------------ # Include definition lists and field lists (in addition to ordered # and unordered lists) in the test if a list is "simple" (cf. the # html4css1.HTMLTranslator docstring and the SimpleListChecker class at # the end of this file). def is_compactable(self, node): # explicite class arguments have precedence if 'compact' in node['classes']: return True if 'open' in node['classes']: return False # check config setting: if (isinstance(node, (nodes.field_list, nodes.definition_list)) and not self.settings.compact_field_lists): return False if (isinstance(node, (nodes.enumerated_list, nodes.bullet_list)) and not self.settings.compact_lists): return False # Table of Contents: if (self.topic_classes == ['contents']): # TODO: look in parent nodes, remove self.topic_classes? return True # check the list items: return self.check_simple_list(node) def visit_bullet_list(self, node): atts = {} old_compact_simple = self.compact_simple self.context.append((self.compact_simple, self.compact_p)) self.compact_p = None self.compact_simple = self.is_compactable(node) if self.compact_simple and not old_compact_simple: atts['class'] = 'simple' self.body.append(self.starttag(node, 'ul', **atts)) def depart_bullet_list(self, node): self.compact_simple, self.compact_p = self.context.pop() self.body.append('</ul>\n') def visit_caption(self, node): self.body.append(self.starttag(node, 'p', '', CLASS='caption')) def depart_caption(self, node): self.body.append('</p>\n') def visit_citation(self, node): # Use definition list for bibliographic references. # Join adjacent citation entries. # TODO: use <aside>. if not self.in_footnote_list: listnode = node.copy() listnode['ids'] = [] self.body.append(self.starttag(listnode, 'dl', CLASS='citation')) # self.body.append('<dl class="citation">\n') self.in_footnote_list = True def depart_citation(self, node): self.body.append('</dd>\n') if not isinstance(node.next_node(descend=False, siblings=True), nodes.citation): self.body.append('</dl>\n') self.in_footnote_list = False def visit_citation_reference(self, node): href = '#' if 'refid' in node: href += node['refid'] elif 'refname' in node: href += self.document.nameids[node['refname']] # else: # TODO system message (or already in the transform)? # 'Citation reference missing.' self.body.append(self.starttag( node, 'a', '[', CLASS='citation-reference', href=href)) def depart_citation_reference(self, node): self.body.append(']</a>') # classifier # ---------- # don't insert classifier-delimiter here (done by CSS) def visit_classifier(self, node): self.body.append(self.starttag(node, 'span', '', CLASS='classifier')) def depart_classifier(self, node): self.body.append('</span>') def visit_colspec(self, node): self.colspecs.append(node) # "stubs" list is an attribute of the tgroup element: node.parent.stubs.append(node.attributes.get('stub')) def depart_colspec(self, node): # write out <colgroup> when all colspecs are processed if isinstance(node.next_node(descend=False, siblings=True), nodes.colspec): return if 'colwidths-auto' in node.parent.parent['classes'] or ( 'colwidths-auto' in self.settings.table_style and ('colwidths-given' not in node.parent.parent['classes'])): return total_width = sum(node['colwidth'] for node in self.colspecs) self.body.append(self.starttag(node, 'colgroup')) for node in self.colspecs: colwidth = int(node['colwidth'] * 100.0 / total_width + 0.5) self.body.append(self.emptytag(node, 'col', style='width: %i%%' % colwidth)) self.body.append('</colgroup>\n') def visit_comment(self, node, sub=re.compile('-(?=-)').sub): """Escape double-dashes in comment text.""" self.body.append('<!-- %s -->\n' % sub('- ', node.astext())) # Content already processed: raise nodes.SkipNode def visit_compound(self, node): self.body.append(self.starttag(node, 'div', CLASS='compound')) if len(node) > 1: node[0]['classes'].append('compound-first') node[-1]['classes'].append('compound-last') for child in node[1:-1]: child['classes'].append('compound-middle') def depart_compound(self, node): self.body.append('</div>\n') def visit_container(self, node): self.body.append(self.starttag(node, 'div', CLASS='docutils container')) def depart_container(self, node): self.body.append('</div>\n') def visit_contact(self, node): self.visit_docinfo_item(node, 'contact', meta=False) def depart_contact(self, node): self.depart_docinfo_item() def visit_copyright(self, node): self.visit_docinfo_item(node, 'copyright') def depart_copyright(self, node): self.depart_docinfo_item() def visit_date(self, node): self.visit_docinfo_item(node, 'date') def depart_date(self, node): self.depart_docinfo_item() def visit_decoration(self, node): pass def depart_decoration(self, node): pass def visit_definition(self, node): self.body.append('</dt>\n') self.body.append(self.starttag(node, 'dd', '')) def depart_definition(self, node): self.body.append('</dd>\n') def visit_definition_list(self, node): classes = node.setdefault('classes', []) if self.is_compactable(node): classes.append('simple') self.body.append(self.starttag(node, 'dl')) def depart_definition_list(self, node): self.body.append('</dl>\n') def visit_definition_list_item(self, node): # pass class arguments, ids and names to definition term: node.children[0]['classes'] = ( node.get('classes', []) + node.children[0].get('classes', [])) node.children[0]['ids'] = ( node.get('ids', []) + node.children[0].get('ids', [])) node.children[0]['names'] = ( node.get('names', []) + node.children[0].get('names', [])) def depart_definition_list_item(self, node): pass def visit_description(self, node): self.body.append(self.starttag(node, 'dd', '')) def depart_description(self, node): self.body.append('</dd>\n') def visit_docinfo(self, node): self.context.append(len(self.body)) classes = 'docinfo' if (self.is_compactable(node)): classes += ' simple' self.body.append(self.starttag(node, 'dl', CLASS=classes)) def depart_docinfo(self, node): self.body.append('</dl>\n') start = self.context.pop() self.docinfo = self.body[start:] self.body = [] def visit_docinfo_item(self, node, name, meta=True): if meta: meta_tag = '<meta name="%s" content="%s" />\n' \ % (name, self.attval(node.astext())) self.add_meta(meta_tag) self.body.append('<dt class="%s">%s</dt>\n' % (name, self.language.labels[name])) self.body.append(self.starttag(node, 'dd', '', CLASS=name)) def depart_docinfo_item(self): self.body.append('</dd>\n') def visit_doctest_block(self, node): self.body.append(self.starttag(node, 'pre', suffix='', CLASS='code python doctest')) def depart_doctest_block(self, node): self.body.append('\n</pre>\n') def visit_document(self, node): title = (node.get('title', '') or os.path.basename(node['source']) or 'docutils document without title') self.head.append('<title>%s</title>\n' % self.encode(title)) def depart_document(self, node): self.head_prefix.extend([self.doctype, self.head_prefix_template % {'lang': self.settings.language_code}]) self.html_prolog.append(self.doctype) self.meta.insert(0, self.content_type % self.settings.output_encoding) self.head.insert(0, self.content_type % self.settings.output_encoding) if 'name="dcterms.' in ''.join(self.meta): self.head.append( '<link rel="schema.dcterms" href="http://purl.org/dc/terms/"/>') if self.math_header: if self.math_output == 'mathjax': self.head.extend(self.math_header) else: self.stylesheet.extend(self.math_header) # skip content-type meta tag with interpolated charset value: self.html_head.extend(self.head[1:]) self.body_prefix.append(self.starttag(node, 'div', CLASS='document')) self.body_suffix.insert(0, '</div>\n') self.fragment.extend(self.body) # self.fragment is the "naked" body self.html_body.extend(self.body_prefix[1:] + self.body_pre_docinfo + self.docinfo + self.body + self.body_suffix[:-1]) assert not self.context, 'len(context) = %s' % len(self.context) def visit_emphasis(self, node): self.body.append(self.starttag(node, 'em', '')) def depart_emphasis(self, node): self.body.append('</em>') def visit_entry(self, node): atts = {'class': []} if isinstance(node.parent.parent, nodes.thead): atts['class'].append('head') if node.parent.parent.parent.stubs[node.parent.column]: # "stubs" list is an attribute of the tgroup element atts['class'].append('stub') if atts['class']: tagname = 'th' atts['class'] = ' '.join(atts['class']) else: tagname = 'td' del atts['class'] node.parent.column += 1 if 'morerows' in node: atts['rowspan'] = node['morerows'] + 1 if 'morecols' in node: atts['colspan'] = node['morecols'] + 1 node.parent.column += node['morecols'] self.body.append(self.starttag(node, tagname, '', **atts)) self.context.append('</%s>\n' % tagname.lower()) # TODO: why does the html4css1 writer insert an NBSP into empty cells? # if len(node) == 0: # empty cell # self.body.append(' ') # no-break space def depart_entry(self, node): self.body.append(self.context.pop()) def visit_enumerated_list(self, node): atts = {} if 'start' in node: atts['start'] = node['start'] if 'enumtype' in node: atts['class'] = node['enumtype'] if self.is_compactable(node): atts['class'] = (atts.get('class', '') + ' simple').strip() self.body.append(self.starttag(node, 'ol', **atts)) def depart_enumerated_list(self, node): self.body.append('</ol>\n') def visit_field_list(self, node): # Keep simple paragraphs in the field_body to enable CSS # rule to start body on new line if the label is too long classes = 'field-list' if (self.is_compactable(node)): classes += ' simple' self.body.append(self.starttag(node, 'dl', CLASS=classes)) def depart_field_list(self, node): self.body.append('</dl>\n') def visit_field(self, node): pass def depart_field(self, node): pass # as field is ignored, pass class arguments to field-name and field-body: def visit_field_name(self, node): self.body.append(self.starttag(node, 'dt', '', CLASS=''.join(node.parent['classes']))) def depart_field_name(self, node): self.body.append('</dt>\n') def visit_field_body(self, node): self.body.append(self.starttag(node, 'dd', '', CLASS=''.join(node.parent['classes']))) # prevent misalignment of following content if the field is empty: if not node.children: self.body.append('<p></p>') def depart_field_body(self, node): self.body.append('</dd>\n') def visit_figure(self, node): atts = {'class': 'figure'} if node.get('width'): atts['style'] = 'width: %s' % node['width'] if node.get('align'): atts['class'] += " align-" + node['align'] self.body.append(self.starttag(node, 'div', **atts)) def depart_figure(self, node): self.body.append('</div>\n') # use HTML 5 <footer> element? def visit_footer(self, node): self.context.append(len(self.body)) def depart_footer(self, node): start = self.context.pop() footer = [self.starttag(node, 'div', CLASS='footer'), '<hr class="footer" />\n'] footer.extend(self.body[start:]) footer.append('\n</div>\n') self.footer.extend(footer) self.body_suffix[:0] = footer del self.body[start:] # TODO: use the new HTML5 element <aside> for footnote text # (allows better styling with CSS, the current <dl> list styling # with "float" interferes with sidebars). def visit_footnote(self, node): if not self.in_footnote_list: listnode = node.copy() listnode['ids'] = [] classes = 'footnote ' + self.settings.footnote_references self.body.append(self.starttag(listnode, 'dl', CLASS=classes)) # self.body.append('<dl class="%s">\n'%classes) self.in_footnote_list = True def depart_footnote(self, node): self.body.append('</dd>\n') if not isinstance(node.next_node(descend=False, siblings=True), nodes.footnote): self.body.append('</dl>\n') self.in_footnote_list = False def visit_footnote_reference(self, node): href = '#' + node['refid'] classes = 'footnote-reference ' + self.settings.footnote_references self.body.append(self.starttag(node, 'a', '', #suffix, CLASS=classes, href=href)) def depart_footnote_reference(self, node): self.body.append('</a>') # Docutils-generated text: put section numbers in a span for CSS styling: def visit_generated(self, node): if 'sectnum' in node['classes']: # get section number (strip trailing no-break-spaces) sectnum = node.astext().rstrip(u' ') self.body.append('<span class="sectnum">%s</span> ' % self.encode(sectnum)) # Content already processed: raise nodes.SkipNode def depart_generated(self, node): pass def visit_header(self, node): self.context.append(len(self.body)) def depart_header(self, node): start = self.context.pop() header = [self.starttag(node, 'div', CLASS='header')] header.extend(self.body[start:]) header.append('\n<hr class="header"/>\n</div>\n') self.body_prefix.extend(header) self.header.extend(header) del self.body[start:] def visit_image(self, node): atts = {} uri = node['uri'] mimetype = mimetypes.guess_type(uri)[0] # image size if 'width' in node: atts['width'] = node['width'] if 'height' in node: atts['height'] = node['height'] if 'scale' in node: if (PIL and not ('width' in node and 'height' in node) and self.settings.file_insertion_enabled): imagepath = url2pathname(uri) try: img = PIL.Image.open( imagepath.encode(sys.getfilesystemencoding())) except (IOError, UnicodeEncodeError): pass # TODO: warn? else: self.settings.record_dependencies.add( imagepath.replace('\\', '/')) if 'width' not in atts: atts['width'] = '%dpx' % img.size[0] if 'height' not in atts: atts['height'] = '%dpx' % img.size[1] del img for att_name in 'width', 'height': if att_name in atts: match = re.match(r'([0-9.]+)(\S*)$', atts[att_name]) assert match atts[att_name] = '%s%s' % ( float(match.group(1)) * (float(node['scale']) / 100), match.group(2)) style = [] for att_name in 'width', 'height': if att_name in atts: if re.match(r'^[0-9.]+$', atts[att_name]): # Interpret unitless values as pixels. atts[att_name] += 'px' style.append('%s: %s;' % (att_name, atts[att_name])) del atts[att_name] if style: atts['style'] = ' '.join(style) if (isinstance(node.parent, nodes.TextElement) or (isinstance(node.parent, nodes.reference) and not isinstance(node.parent.parent, nodes.TextElement))): # Inline context or surrounded by <a>...</a>. suffix = '' else: suffix = '\n' if 'align' in node: atts['class'] = 'align-%s' % node['align'] # Embed image file (embedded SVG or data URI): if self.settings.embed_images or ('embed' in node): err_msg = '' if not mimetype: err_msg = 'unknown MIME type' if not self.settings.file_insertion_enabled: err_msg = 'file insertion disabled.' try: with open(url2pathname(uri), 'rb') as imagefile: imagedata = imagefile.read() except IOError as err: err_msg = err.strerror if err_msg: self.document.reporter.error('Cannot embed image %r: %s' %(uri, err_msg)) else: self.settings.record_dependencies.add( uri.replace('\\', '/')) # TODO: insert SVG as-is? # if mimetype == 'image/svg+xml': # read/parse, apply arguments, # insert as <svg ....> ... </svg> # (about 1/3 less data) data64 = base64.b64encode(imagedata).decode() uri = u'data:%s;base64,%s' % (mimetype, data64) if mimetype == 'application/x-shockwave-flash': atts['type'] = mimetype # do NOT use an empty tag: incorrect rendering in browsers tag = (self.starttag(node, 'object', '', data=uri, **atts) + node.get('alt', uri) + '</object>' + suffix) else: atts['alt'] = node.get('alt', node['uri']) tag = self.emptytag(node, 'img', suffix, src=uri, **atts) self.body.append(tag) def depart_image(self, node): pass def visit_inline(self, node): self.body.append(self.starttag(node, 'span', '')) def depart_inline(self, node): self.body.append('</span>') # footnote and citation labels: def visit_label(self, node): if (isinstance(node.parent, nodes.footnote)): classes = self.settings.footnote_references else: classes = 'brackets' # pass parent node to get id into starttag: self.body.append(self.starttag(node.parent, 'dt', '', CLASS='label')) self.body.append(self.starttag(node, 'span', '', CLASS=classes)) # footnote/citation backrefs: if self.settings.footnote_backlinks: backrefs = node.parent['backrefs'] if len(backrefs) == 1: self.body.append('<a class="fn-backref" href="#%s">' % backrefs[0]) def depart_label(self, node): if self.settings.footnote_backlinks: backrefs = node.parent['backrefs'] if len(backrefs) == 1: self.body.append('</a>') self.body.append('</span>') if self.settings.footnote_backlinks and len(backrefs) > 1: backlinks = ['<a href="#%s">%s</a>' % (ref, i) for (i, ref) in enumerate(backrefs, 1)] self.body.append('<span class="fn-backref">(%s)</span>' % ','.join(backlinks)) self.body.append('</dt>\n<dd>') def visit_legend(self, node): self.body.append(self.starttag(node, 'div', CLASS='legend')) def depart_legend(self, node): self.body.append('</div>\n') def visit_line(self, node): self.body.append(self.starttag(node, 'div', suffix='', CLASS='line')) if not len(node): self.body.append('<br />') def depart_line(self, node): self.body.append('</div>\n') def visit_line_block(self, node): self.body.append(self.starttag(node, 'div', CLASS='line-block')) def depart_line_block(self, node): self.body.append('</div>\n') def visit_list_item(self, node): self.body.append(self.starttag(node, 'li', '')) def depart_list_item(self, node): self.body.append('</li>\n') # inline literal def visit_literal(self, node): # special case: "code" role classes = node.get('classes', []) if 'code' in classes: # filter 'code' from class arguments node['classes'] = [cls for cls in classes if cls != 'code'] self.body.append(self.starttag(node, 'code', '')) return self.body.append( self.starttag(node, 'span', '', CLASS='docutils literal')) text = node.astext() # remove hard line breaks (except if in a parsed-literal block) if not isinstance(node.parent, nodes.literal_block): text = text.replace('\n', ' ') # Protect text like ``--an-option`` and the regular expression # ``[+]?(\d+(\.\d*)?|\.\d+)`` from bad line wrapping for token in self.words_and_spaces.findall(text): if token.strip() and self.in_word_wrap_point.search(token): self.body.append('<span class="pre">%s</span>' % self.encode(token)) else: self.body.append(self.encode(token)) self.body.append('</span>') # Content already processed: raise nodes.SkipNode def depart_literal(self, node): # skipped unless literal element is from "code" role: self.body.append('</code>') def visit_literal_block(self, node): self.body.append(self.starttag(node, 'pre', '', CLASS='literal-block')) if 'code' in node.get('classes', []): self.body.append('<code>') def depart_literal_block(self, node): if 'code' in node.get('classes', []): self.body.append('</code>') self.body.append('</pre>\n') # Mathematics: # As there is no native HTML math support, we provide alternatives # for the math-output: LaTeX and MathJax simply wrap the content, # HTML and MathML also convert the math_code. # HTML container math_tags = {# math_output: (block, inline, class-arguments) 'mathml': ('div', '', ''), 'html': ('div', 'span', 'formula'), 'mathjax': ('div', 'span', 'math'), 'latex': ('pre', 'tt', 'math'), } def visit_math(self, node, math_env=''): # If the method is called from visit_math_block(), math_env != ''. if self.math_output not in self.math_tags: self.document.reporter.error( 'math-output format "%s" not supported ' 'falling back to "latex"'% self.math_output) self.math_output = 'latex' tag = self.math_tags[self.math_output][math_env == ''] clsarg = self.math_tags[self.math_output][2] # LaTeX container wrappers = {# math_mode: (inline, block) 'mathml': ('$%s$', u'\\begin{%s}\n%s\n\\end{%s}'), 'html': ('$%s$', u'\\begin{%s}\n%s\n\\end{%s}'), 'mathjax': (r'\(%s\)', u'\\begin{%s}\n%s\n\\end{%s}'), 'latex': (None, None), } wrapper = wrappers[self.math_output][math_env != ''] if self.math_output == 'mathml' and (not self.math_output_options or self.math_output_options[0] == 'blahtexml'): wrapper = None # get and wrap content math_code = node.astext().translate(unichar2tex.uni2tex_table) if wrapper: try: # wrapper with three "%s" math_code = wrapper % (math_env, math_code, math_env) except TypeError: # wrapper with one "%s" math_code = wrapper % math_code # settings and conversion if self.math_output in ('latex', 'mathjax'): math_code = self.encode(math_code) if self.math_output == 'mathjax' and not self.math_header: try: self.mathjax_url = self.math_output_options[0] except IndexError: self.document.reporter.warning('No MathJax URL specified, ' 'using local fallback (see config.html)') # append configuration, if not already present in the URL: # input LaTeX with AMS, output common HTML if '?' not in self.mathjax_url: self.mathjax_url += '?config=TeX-AMS_CHTML' self.math_header = [self.mathjax_script % self.mathjax_url] elif self.math_output == 'html': if self.math_output_options and not self.math_header: self.math_header = [self.stylesheet_call( utils.find_file_in_dirs(s, self.settings.stylesheet_dirs)) for s in self.math_output_options[0].split(',')] # TODO: fix display mode in matrices and fractions math2html.DocumentParameters.displaymode = (math_env != '') math_code = math2html.math2html(math_code) elif self.math_output == 'mathml': if 'XHTML 1' in self.doctype: self.doctype = self.doctype_mathml self.content_type = self.content_type_mathml converter = ' '.join(self.math_output_options).lower() try: if converter == 'latexml': math_code = tex2mathml_extern.latexml(math_code, self.document.reporter) elif converter == 'ttm': math_code = tex2mathml_extern.ttm(math_code, self.document.reporter) elif converter == 'blahtexml': math_code = tex2mathml_extern.blahtexml(math_code, inline=not(math_env), reporter=self.document.reporter) elif not converter: math_code = latex2mathml.tex2mathml(math_code, inline=not(math_env)) else: self.document.reporter.error('option "%s" not supported ' 'with math-output "MathML"') except OSError: raise OSError('is "latexmlmath" in your PATH?') except SyntaxError as err: err_node = self.document.reporter.error(err, base_node=node) self.visit_system_message(err_node) self.body.append(self.starttag(node, 'p')) self.body.append(u','.join(err.args)) self.body.append('</p>\n') self.body.append(self.starttag(node, 'pre', CLASS='literal-block')) self.body.append(self.encode(math_code)) self.body.append('\n</pre>\n') self.depart_system_message(err_node) raise nodes.SkipNode # append to document body if tag: self.body.append(self.starttag(node, tag, suffix='\n'*bool(math_env), CLASS=clsarg)) self.body.append(math_code) if math_env: # block mode (equation, display) self.body.append('\n') if tag: self.body.append('</%s>' % tag) if math_env: self.body.append('\n') # Content already processed: raise nodes.SkipNode def depart_math(self, node): pass # never reached def visit_math_block(self, node): math_env = pick_math_environment(node.astext()) self.visit_math(node, math_env=math_env) def depart_math_block(self, node): pass # never reached # Meta tags: 'lang' attribute replaced by 'xml:lang' in XHTML 1.1 # HTML5/polyglot recommends using both def visit_meta(self, node): meta = self.emptytag(node, 'meta', **node.non_default_attributes()) self.add_meta(meta) def depart_meta(self, node): pass def add_meta(self, tag): self.meta.append(tag) self.head.append(tag) def visit_option(self, node): self.body.append(self.starttag(node, 'span', '', CLASS='option')) def depart_option(self, node): self.body.append('</span>') if isinstance(node.next_node(descend=False, siblings=True), nodes.option): self.body.append(', ') def visit_option_argument(self, node): self.body.append(node.get('delimiter', ' ')) self.body.append(self.starttag(node, 'var', '')) def depart_option_argument(self, node): self.body.append('</var>') def visit_option_group(self, node): self.body.append(self.starttag(node, 'dt', '')) self.body.append('<kbd>') def depart_option_group(self, node): self.body.append('</kbd></dt>\n') def visit_option_list(self, node): self.body.append( self.starttag(node, 'dl', CLASS='option-list')) def depart_option_list(self, node): self.body.append('</dl>\n') def visit_option_list_item(self, node): pass def depart_option_list_item(self, node): pass def visit_option_string(self, node): pass def depart_option_string(self, node): pass def visit_organization(self, node): self.visit_docinfo_item(node, 'organization') def depart_organization(self, node): self.depart_docinfo_item() # Do not omit <p> tags # -------------------- # # The HTML4CSS1 writer does this to "produce # visually compact lists (less vertical whitespace)". This writer # relies on CSS rules for"visual compactness". # # * In XHTML 1.1, e.g. a <blockquote> element may not contain # character data, so you cannot drop the <p> tags. # * Keeping simple paragraphs in the field_body enables a CSS # rule to start the field-body on a new line if the label is too long # * it makes the code simpler. # # TODO: omit paragraph tags in simple table cells? def visit_paragraph(self, node): self.body.append(self.starttag(node, 'p', '')) def depart_paragraph(self, node): self.body.append('</p>') if not (isinstance(node.parent, (nodes.list_item, nodes.entry)) and (len(node.parent) == 1)): self.body.append('\n') def visit_problematic(self, node): if node.hasattr('refid'): self.body.append('<a href="#%s">' % node['refid']) self.context.append('</a>') else: self.context.append('') self.body.append(self.starttag(node, 'span', '', CLASS='problematic')) def depart_problematic(self, node): self.body.append('</span>') self.body.append(self.context.pop()) def visit_raw(self, node): if 'html' in node.get('format', '').split(): t = isinstance(node.parent, nodes.TextElement) and 'span' or 'div' if node['classes']: self.body.append(self.starttag(node, t, suffix='')) self.body.append(node.astext()) if node['classes']: self.body.append('</%s>' % t) # Keep non-HTML raw text out of output: raise nodes.SkipNode def visit_reference(self, node): atts = {'class': 'reference'} if 'refuri' in node: atts['href'] = node['refuri'] if ( self.settings.cloak_email_addresses and atts['href'].startswith('mailto:')): atts['href'] = self.cloak_mailto(atts['href']) self.in_mailto = True atts['class'] += ' external' else: assert 'refid' in node, \ 'References must have "refuri" or "refid" attribute.' atts['href'] = '#' + node['refid'] atts['class'] += ' internal' if len(node) == 1 and isinstance(node[0], nodes.image): atts['class'] += ' image-reference' if not isinstance(node.parent, nodes.TextElement): assert len(node) == 1 and isinstance(node[0], nodes.image) atts['class'] += ' image-reference' self.body.append(self.starttag(node, 'a', '', **atts)) def depart_reference(self, node): self.body.append('</a>') if not isinstance(node.parent, nodes.TextElement): self.body.append('\n') self.in_mailto = False def visit_revision(self, node): self.visit_docinfo_item(node, 'revision', meta=False) def depart_revision(self, node): self.depart_docinfo_item() def visit_row(self, node): self.body.append(self.starttag(node, 'tr', '')) node.column = 0 def depart_row(self, node): self.body.append('</tr>\n') def visit_rubric(self, node): self.body.append(self.starttag(node, 'p', '', CLASS='rubric')) def depart_rubric(self, node): self.body.append('</p>\n') def visit_section(self, node): self.section_level += 1 self.body.append( self.starttag(node, 'div', CLASS='section')) def depart_section(self, node): self.section_level -= 1 self.body.append('</div>\n') # TODO: use the new HTML5 element <aside> def visit_sidebar(self, node): self.body.append( self.starttag(node, 'div', CLASS='sidebar')) self.in_sidebar = True def depart_sidebar(self, node): self.body.append('</div>\n') self.in_sidebar = False def visit_status(self, node): self.visit_docinfo_item(node, 'status', meta=False) def depart_status(self, node): self.depart_docinfo_item() def visit_strong(self, node): self.body.append(self.starttag(node, 'strong', '')) def depart_strong(self, node): self.body.append('</strong>') def visit_subscript(self, node): self.body.append(self.starttag(node, 'sub', '')) def depart_subscript(self, node): self.body.append('</sub>') def visit_substitution_definition(self, node): """Internal only.""" raise nodes.SkipNode def visit_substitution_reference(self, node): self.unimplemented_visit(node) # h1–h6 elements must not be used to markup subheadings, subtitles, # alternative titles and taglines unless intended to be the heading for a # new section or subsection. # -- http://www.w3.org/TR/html/sections.html#headings-and-sections def visit_subtitle(self, node): if isinstance(node.parent, nodes.sidebar): classes = 'sidebar-subtitle' elif isinstance(node.parent, nodes.document): classes = 'subtitle' self.in_document_title = len(self.body)+1 elif isinstance(node.parent, nodes.section): classes = 'section-subtitle' self.body.append(self.starttag(node, 'p', '', CLASS=classes)) def depart_subtitle(self, node): self.body.append('</p>\n') if isinstance(node.parent, nodes.document): self.subtitle = self.body[self.in_document_title:-1] self.in_document_title = 0 self.body_pre_docinfo.extend(self.body) self.html_subtitle.extend(self.body) del self.body[:] def visit_superscript(self, node): self.body.append(self.starttag(node, 'sup', '')) def depart_superscript(self, node): self.body.append('</sup>') def visit_system_message(self, node): self.body.append(self.starttag(node, 'div', CLASS='system-message')) self.body.append('<p class="system-message-title">') backref_text = '' if len(node['backrefs']): backrefs = node['backrefs'] if len(backrefs) == 1: backref_text = ('; <em><a href="#%s">backlink</a></em>' % backrefs[0]) else: i = 1 backlinks = [] for backref in backrefs: backlinks.append('<a href="#%s">%s</a>' % (backref, i)) i += 1 backref_text = ('; <em>backlinks: %s</em>' % ', '.join(backlinks)) if node.hasattr('line'): line = ', line %s' % node['line'] else: line = '' self.body.append('System Message: %s/%s ' '(<span class="docutils literal">%s</span>%s)%s</p>\n' % (node['type'], node['level'], self.encode(node['source']), line, backref_text)) def depart_system_message(self, node): self.body.append('</div>\n') def visit_table(self, node): atts = {} classes = [cls.strip(u' \t\n') for cls in self.settings.table_style.split(',')] if 'align' in node: classes.append('align-%s' % node['align']) if 'width' in node: atts['style'] = 'width: %s' % node['width'] tag = self.starttag(node, 'table', CLASS=' '.join(classes), **atts) self.body.append(tag) def depart_table(self, node): self.body.append('</table>\n') def visit_target(self, node): if not ('refuri' in node or 'refid' in node or 'refname' in node): self.body.append(self.starttag(node, 'span', '', CLASS='target')) self.context.append('</span>') else: self.context.append('') def depart_target(self, node): self.body.append(self.context.pop()) # no hard-coded vertical alignment in table body def visit_tbody(self, node): self.body.append(self.starttag(node, 'tbody')) def depart_tbody(self, node): self.body.append('</tbody>\n') def visit_term(self, node): self.body.append(self.starttag(node, 'dt', '')) def depart_term(self, node): """ Leave the end tag to `self.visit_definition()`, in case there's a classifier. """ pass def visit_tgroup(self, node): self.colspecs = [] node.stubs = [] def depart_tgroup(self, node): pass def visit_thead(self, node): self.body.append(self.starttag(node, 'thead')) def depart_thead(self, node): self.body.append('</thead>\n') def visit_title(self, node): """Only 6 section levels are supported by HTML.""" close_tag = '</p>\n' if isinstance(node.parent, nodes.topic): self.body.append( self.starttag(node, 'p', '', CLASS='topic-title')) elif isinstance(node.parent, nodes.sidebar): self.body.append( self.starttag(node, 'p', '', CLASS='sidebar-title')) elif isinstance(node.parent, nodes.Admonition): self.body.append( self.starttag(node, 'p', '', CLASS='admonition-title')) elif isinstance(node.parent, nodes.table): self.body.append( self.starttag(node, 'caption', '')) close_tag = '</caption>\n' elif isinstance(node.parent, nodes.document): self.body.append(self.starttag(node, 'h1', '', CLASS='title')) close_tag = '</h1>\n' self.in_document_title = len(self.body) else: assert isinstance(node.parent, nodes.section) h_level = self.section_level + self.initial_header_level - 1 atts = {} if (len(node.parent) >= 2 and isinstance(node.parent[1], nodes.subtitle)): atts['CLASS'] = 'with-subtitle' self.body.append( self.starttag(node, 'h%s' % h_level, '', **atts)) atts = {} if node.hasattr('refid'): atts['class'] = 'toc-backref' atts['href'] = '#' + node['refid'] if atts: self.body.append(self.starttag({}, 'a', '', **atts)) close_tag = '</a></h%s>\n' % (h_level) else: close_tag = '</h%s>\n' % (h_level) self.context.append(close_tag) def depart_title(self, node): self.body.append(self.context.pop()) if self.in_document_title: self.title = self.body[self.in_document_title:-1] self.in_document_title = 0 self.body_pre_docinfo.extend(self.body) self.html_title.extend(self.body) del self.body[:] def visit_title_reference(self, node): self.body.append(self.starttag(node, 'cite', '')) def depart_title_reference(self, node): self.body.append('</cite>') def visit_topic(self, node): self.body.append(self.starttag(node, 'div', CLASS='topic')) self.topic_classes = node['classes'] def depart_topic(self, node): self.body.append('</div>\n') self.topic_classes = [] def visit_transition(self, node): self.body.append(self.emptytag(node, 'hr', CLASS='docutils')) def depart_transition(self, node): pass def visit_version(self, node): self.visit_docinfo_item(node, 'version', meta=False) def depart_version(self, node): self.depart_docinfo_item() def unimplemented_visit(self, node): raise NotImplementedError('visiting unimplemented node type: %s' % node.__class__.__name__) class SimpleListChecker(nodes.GenericNodeVisitor): """ Raise `nodes.NodeFound` if non-simple list item is encountered. Here "simple" means a list item containing nothing other than a single paragraph, a simple list, or a paragraph followed by a simple list. This version also checks for simple field lists and docinfo. """ def default_visit(self, node): raise nodes.NodeFound def visit_list_item(self, node): children = [child for child in node.children if not isinstance(child, nodes.Invisible)] if (children and isinstance(children[0], nodes.paragraph) and (isinstance(children[-1], nodes.bullet_list) or isinstance(children[-1], nodes.enumerated_list) or isinstance(children[-1], nodes.field_list))): children.pop() if len(children) <= 1: return else: raise nodes.NodeFound def pass_node(self, node): pass def ignore_node(self, node): # ignore nodes that are never complex (can contain only inline nodes) raise nodes.SkipNode # Paragraphs and text visit_Text = ignore_node visit_paragraph = ignore_node # Lists visit_bullet_list = pass_node visit_enumerated_list = pass_node visit_docinfo = pass_node # Docinfo nodes: visit_author = ignore_node visit_authors = visit_list_item visit_address = visit_list_item visit_contact = pass_node visit_copyright = ignore_node visit_date = ignore_node visit_organization = ignore_node visit_status = ignore_node visit_version = visit_list_item # Definition list: visit_definition_list = pass_node visit_definition_list_item = pass_node visit_term = ignore_node visit_classifier = pass_node visit_definition = visit_list_item # Field list: visit_field_list = pass_node visit_field = pass_node # the field body corresponds to a list item visit_field_body = visit_list_item visit_field_name = ignore_node # Invisible nodes should be ignored. visit_comment = ignore_node visit_substitution_definition = ignore_node visit_target = ignore_node visit_pending = ignore_node