- # The dict of "extras" to enable in processing -- a mapping of
- # extra name to argument for the extra. Most extras do not have an
- # argument, in which case the value is None.
- #
- # This can be set via (a) subclassing and (b) the constructor
- # "extras" argument.
- extras = None
-
- urls = None
- titles = None
- html_blocks = None
- html_spans = None
- html_removed_text = "[HTML_REMOVED]" # for compat with markdown.py
-
- # Used to track when we're inside an ordered or unordered list
- # (see _ProcessListItems() for details):
- list_level = 0
-
- _ws_only_line_re = re.compile(r"^[ \t]+$", re.M)
-
- def __init__(self, html4tags=False, tab_width=4, safe_mode=None,
- extras=None, link_patterns=None):
- if html4tags:
- self.empty_element_suffix = ">"
- else:
- self.empty_element_suffix = " />"
- self.tab_width = tab_width
-
- # For compatibility with earlier markdown2.py and with
- # markdown.py's safe_mode being a boolean,
- # safe_mode == True -> "replace"
- if safe_mode is True:
- self.safe_mode = "replace"
- else:
- self.safe_mode = safe_mode
-
- if self.extras is None:
- self.extras = {}
- elif not isinstance(self.extras, dict):
- self.extras = dict([(e, None) for e in self.extras])
- if extras:
- if not isinstance(extras, dict):
- extras = dict([(e, None) for e in extras])
- self.extras.update(extras)
- assert isinstance(self.extras, dict)
- self._instance_extras = self.extras.copy()
- self.link_patterns = link_patterns
- self._outdent_re = re.compile(r'^(\t|[ ]{1,%d})' % tab_width, re.M)
-
- def reset(self):
- self.urls = {}
- self.titles = {}
- self.html_blocks = {}
- self.html_spans = {}
- self.list_level = 0
- self.extras = self._instance_extras.copy()
- self.encoding = 'utf-8'
- if "footnotes" in self.extras:
- self.footnotes = {}
- self.footnote_ids = []
-
- def convert(self, text, encoding=None):
- """Convert the given text."""
- # Main function. The order in which other subs are called here is
- # essential. Link and image substitutions need to happen before
- # _EscapeSpecialChars(), so that any *'s or _'s in the <a>
- # and <img> tags get encoded.
-
- # Clear the global hashes. If we don't clear these, you get conflicts
- # from other articles when generating a page which contains more than
- # one article (e.g. an index page that shows the N most recent
- # articles):
- self.reset()
- if encoding:
- self.encoding = encoding
-
- if not isinstance(text, unicode):
- text = unicode(text, self.encoding)
-
- # Standardize line endings:
- #text = re.sub("\r\n|\r", "\n", text)
-
- # Make sure $text ends with a couple of newlines:
- text += "\n\n"
-
- # Convert all tabs to spaces.
- text = self._detab(text)
-
- # Strip any lines consisting only of spaces and tabs.
- # This makes subsequent regexen easier to write, because we can
- # match consecutive blank lines with /\n+/ instead of something
- # contorted like /[ \t]*\n+/ .
- text = self._ws_only_line_re.sub("", text)
-
- if self.safe_mode:
- text = self._hash_html_spans(text)
-
- # Turn block-level HTML blocks into hash entries
- text = self._hash_html_blocks(text, raw=True)
-
- # Strip link definitions, store in hashes.
- if "footnotes" in self.extras:
- # Must do footnotes first because an unlucky footnote defn
- # looks like a link defn:
- # [^4]: this "looks like a link defn"
- text = self._strip_footnote_definitions(text)
- text = self._strip_link_definitions(text)
-
- text = self._run_block_gamut(text)
-
- if "footnotes" in self.extras:
- text = self._add_footnotes(text)
-
- text = self._unescape_special_chars(text)
-
- if self.safe_mode:
- text = self._unhash_html_spans(text)
-
- text += "\n"
- return text
-
- # Cribbed from a post by Bart Lateur:
- # <http://www.nntp.perl.org/group/perl.macperl.anyperl/154>
- _detab_re = re.compile(r'(.*?)\t', re.M)
- def _detab_sub(self, match):
- g1 = match.group(1)
- return g1 + (' ' * (self.tab_width - len(g1) % self.tab_width))
- def _detab(self, text):
- r"""Remove (leading?) tabs from a file.
-
- >>> m = Markdown()
- >>> m._detab("\tfoo")
- ' foo'
- >>> m._detab(" \tfoo")
- ' foo'
- >>> m._detab("\t foo")
- ' foo'
- >>> m._detab(" foo")
- ' foo'
- >>> m._detab(" foo\n\tbar\tblam")
- ' foo\n bar blam'
- """
- if '\t' not in text:
- return text
- return self._detab_re.subn(self._detab_sub, text)[0]
-
- _block_tags_a = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del'
- _strict_tag_block_re = re.compile(r"""
- ( # save in \1
- ^ # start of line (with re.M)
- <(%s) # start tag = \2
- \b # word break
- (.*\n)*? # any number of lines, minimally matching
- </\2> # the matching end tag
- [ \t]* # trailing spaces/tabs
- (?=\n+|\Z) # followed by a newline or end of document
- )
- """ % _block_tags_a,
- re.X | re.M)
-
- _block_tags_b = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math'
- _liberal_tag_block_re = re.compile(r"""
- ( # save in \1
- ^ # start of line (with re.M)
- <(%s) # start tag = \2
- \b # word break
- (.*\n)*? # any number of lines, minimally matching
- .*</\2> # the matching end tag
- [ \t]* # trailing spaces/tabs
- (?=\n+|\Z) # followed by a newline or end of document
- )
- """ % _block_tags_b,
- re.X | re.M)
-
- def _hash_html_block_sub(self, match, raw=False):
- html = match.group(1)
- if raw and self.safe_mode:
- html = self._sanitize_html(html)
- key = _hash_text(html)
- self.html_blocks[key] = html
- return "\n\n" + key + "\n\n"
-
- def _hash_html_blocks(self, text, raw=False):
- """Hashify HTML blocks
-
- We only want to do this for block-level HTML tags, such as headers,
- lists, and tables. That's because we still want to wrap <p>s around
- "paragraphs" that are wrapped in non-block-level tags, such as anchors,
- phrase emphasis, and spans. The list of tags we're looking for is
- hard-coded.
-
- @param raw {boolean} indicates if these are raw HTML blocks in
- the original source. It makes a difference in "safe" mode.
- """
- if '<' not in text:
- return text
-
- # Pass `raw` value into our calls to self._hash_html_block_sub.
- hash_html_block_sub = _curry(self._hash_html_block_sub, raw=raw)
-
- # First, look for nested blocks, e.g.:
- # tags for inner block must be indented.
- # </div>
- # </div>
- #
- # The outermost tags must start at the left margin for this to match, and
- # the inner nested divs must be indented.
- # We need to do this before the next, more liberal match, because the next
- # match will start at the first `<div>` and stop at the first `</div>`.
- text = self._strict_tag_block_re.sub(hash_html_block_sub, text)
-
- # Now match more liberally, simply from `\n<tag>` to `</tag>\n`
- text = self._liberal_tag_block_re.sub(hash_html_block_sub, text)
-
- # Special case just for <hr />. It was easier to make a special
- # case than to make the other regex more complicated.
- if "<hr" in text:
- _hr_tag_re = _hr_tag_re_from_tab_width(self.tab_width)
- text = _hr_tag_re.sub(hash_html_block_sub, text)
-
- # Special case for standalone HTML comments:
- if "<!--" in text:
- start = 0
- while True:
- # Delimiters for next comment block.
- try:
- start_idx = text.index("<!--", start)
- except ValueError, ex:
- break
- try:
- end_idx = text.index("-->", start_idx) + 3
- except ValueError, ex:
- break
-
- # Start position for next comment block search.
- start = end_idx
-
- # Validate whitespace before comment.
- if start_idx:
- # - Up to `tab_width - 1` spaces before start_idx.
- for i in range(self.tab_width - 1):
- if text[start_idx - 1] != ' ':
- break
- start_idx -= 1
- if start_idx == 0:
- break
- # - Must be preceded by 2 newlines or hit the start of
- # the document.
- if start_idx == 0:
- pass
- elif start_idx == 1 and text[0] == '\n':
- start_idx = 0 # to match minute detail of Markdown.pl regex
- elif text[start_idx-2:start_idx] == '\n\n':
- pass
- else:
- break
-
- # Validate whitespace after comment.
- # - Any number of spaces and tabs.
- while end_idx < len(text):
- if text[end_idx] not in ' \t':
- break
- end_idx += 1
- # - Must be following by 2 newlines or hit end of text.
- if text[end_idx:end_idx+2] not in ('', '\n', '\n\n'):
- continue
-
- # Escape and hash (must match `_hash_html_block_sub`).
- html = text[start_idx:end_idx]
- if raw and self.safe_mode:
- html = self._sanitize_html(html)
- key = _hash_text(html)
- self.html_blocks[key] = html
- text = text[:start_idx] + "\n\n" + key + "\n\n" + text[end_idx:]
-
- if "xml" in self.extras:
- # Treat XML processing instructions and namespaced one-liner
- # tags as if they were block HTML tags. E.g., if standalone
- # (i.e. are their own paragraph), the following do not get
- # wrapped in a <p> tag:
- # <?foo bar?>
- #
- # <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="chapter_1.md"/>
- _xml_oneliner_re = _xml_oneliner_re_from_tab_width(self.tab_width)
- text = _xml_oneliner_re.sub(hash_html_block_sub, text)
-
- return text
-
- def _strip_link_definitions(self, text):
- # Strips link definitions from text, stores the URLs and titles in
- # hash references.
- less_than_tab = self.tab_width - 1
-
- # Link defs are in the form:
- # [id]: url "optional title"
- _link_def_re = re.compile(r"""
- ^[ ]{0,%d}\[(.+)\]: # id = \1
- [ \t]*
- \n? # maybe *one* newline
- [ \t]*
- <?(.+?)>? # url = \2
- [ \t]*
- (?:
- \n? # maybe one newline
- [ \t]*
- (?<=\s) # lookbehind for whitespace
- ['"(]
- ([^\n]*) # title = \3
- ['")]
- [ \t]*
- )? # title is optional
- (?:\n+|\Z)
- """ % less_than_tab, re.X | re.M | re.U)
- return _link_def_re.sub(self._extract_link_def_sub, text)
-
- def _extract_link_def_sub(self, match):
- id, url, title = match.groups()
- key = id.lower() # Link IDs are case-insensitive
- self.urls[key] = self._encode_amps_and_angles(url)
- if title:
- self.titles[key] = title.replace('"', '"')
- return ""
-
- def _extract_footnote_def_sub(self, match):
- id, text = match.groups()
- text = _dedent(text, skip_first_line=not text.startswith('\n')).strip()
- normed_id = re.sub(r'\W', '-', id)
- # Ensure footnote text ends with a couple newlines (for some
- # block gamut matches).
- self.footnotes[normed_id] = text + "\n\n"
- return ""
-
- def _strip_footnote_definitions(self, text):
- """A footnote definition looks like this:
-
- [^note-id]: Text of the note.
-
- May include one or more indented paragraphs.
-
- Where,
- - The 'note-id' can be pretty much anything, though typically it
- is the number of the footnote.
- - The first paragraph may start on the next line, like so:
-
- [^note-id]:
- Text of the note.
- """
- less_than_tab = self.tab_width - 1
- footnote_def_re = re.compile(r'''
- ^[ ]{0,%d}\[\^(.+)\]: # id = \1
- [ \t]*
- ( # footnote text = \2
- # First line need not start with the spaces.
- (?:\s*.*\n+)
- (?:
- (?:[ ]{%d} | \t) # Subsequent lines must be indented.
- .*\n+
- )*
- )
- # Lookahead for non-space at line-start, or end of doc.
- (?:(?=^[ ]{0,%d}\S)|\Z)
- ''' % (less_than_tab, self.tab_width, self.tab_width),
- re.X | re.M)
- return footnote_def_re.sub(self._extract_footnote_def_sub, text)
-
-
- _hr_res = [
- re.compile(r"^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$", re.M),
- re.compile(r"^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$", re.M),
- re.compile(r"^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$", re.M),
- ]
-
- def _run_block_gamut(self, text):
- # These are all the transformations that form block-level
- # tags like paragraphs, headers, and list items.
-
- text = self._do_headers(text)
-
- # Do Horizontal Rules:
- hr = "\n<hr"+self.empty_element_suffix+"\n"
- for hr_re in self._hr_res:
- text = hr_re.sub(hr, text)
-
- text = self._do_lists(text)
-
- if "pyshell" in self.extras:
- text = self._prepare_pyshell_blocks(text)
-
- text = self._do_code_blocks(text)
-
- text = self._do_block_quotes(text)
-
- # We already ran _HashHTMLBlocks() before, in Markdown(), but that
- # was to escape raw HTML in the original Markdown source. This time,
- # we're escaping the markup we've just created, so that we don't wrap
- # <p> tags around block-level tags.
- text = self._hash_html_blocks(text)
-
- text = self._form_paragraphs(text)
-
- return text
-
- def _pyshell_block_sub(self, match):
- lines = match.group(0).splitlines(0)
- _dedentlines(lines)
- indent = ' ' * self.tab_width
- s = ('\n' # separate from possible cuddled paragraph
- + indent + ('\n'+indent).join(lines)
- + '\n\n')
- return s
-
- def _prepare_pyshell_blocks(self, text):
- """Ensure that Python interactive shell sessions are put in
- code blocks -- even if not properly indented.
- """
- if ">>>" not in text:
- return text
-
- less_than_tab = self.tab_width - 1
- _pyshell_block_re = re.compile(r"""
- ^([ ]{0,%d})>>>[ ].*\n # first line
- ^(\1.*\S+.*\n)* # any number of subsequent lines
- ^\n # ends with a blank line
- """ % less_than_tab, re.M | re.X)
-
- return _pyshell_block_re.sub(self._pyshell_block_sub, text)
-
- def _run_span_gamut(self, text):
- # These are all the transformations that occur *within* block-level
- # tags like paragraphs, headers, and list items.
-
- text = self._do_code_spans(text)
-
- text = self._escape_special_chars(text)
-
- # Process anchor and image tags.
- #text = self._do_links(text)
-
- # Make links out of things like `<http://example.com/>`
- # Must come after _do_links(), because you can use < and >
- # delimiters in inline links like [this](<url>).
- text = self._do_auto_links(text)
-
- if "link-patterns" in self.extras:
- text = self._do_link_patterns(text)
-
- text = self._encode_amps_and_angles(text)
-
- text = self._do_italics_and_bold(text)
-
- # Do hard breaks:
- text = re.sub(r" {2,}\n", " <br%s\n" % self.empty_element_suffix, text)
-
- return text
-
- # "Sorta" because auto-links are identified as "tag" tokens.
- _sorta_html_tokenize_re = re.compile(r"""
- (
- # tag
- </?
- (?:\w+) # tag name
- (?:\s+(?:[\w-]+:)?[\w-]+=(?:".*?"|'.*?'))* # attributes
- \s*/?>
- |
- # auto-link (e.g., <http://www.activestate.com/>)
- <\w+[^>]*>
- |
- <!--.*?--> # comment
- |
- <\?.*?\?> # processing instruction
- )
- """, re.X)
-
- def _escape_special_chars(self, text):
- # Python markdown note: the HTML tokenization here differs from
- # that in Markdown.pl, hence the behaviour for subtle cases can
- # differ (I believe the tokenizer here does a better job because
- # it isn't susceptible to unmatched '<' and '>' in HTML tags).
- # Note, however, that '>' is not allowed in an auto-link URL
- # here.
- escaped = []
- is_html_markup = False
- for token in self._sorta_html_tokenize_re.split(text):
- if is_html_markup:
- # Within tags/HTML-comments/auto-links, encode * and _
- # so they don't conflict with their use in Markdown for
- # italics and strong. We're replacing each such
- # character with its corresponding MD5 checksum value;
- # this is likely overkill, but it should prevent us from
- # colliding with the escape values by accident.
- escaped.append(token.replace('*', g_escape_table['*'])
- .replace('_', g_escape_table['_']))
- else:
- escaped.append(self._encode_backslash_escapes(token))
- is_html_markup = not is_html_markup
- return ''.join(escaped)
-
- def _hash_html_spans(self, text):
- # Used for safe_mode.
-
- def _is_auto_link(s):
- if ':' in s and self._auto_link_re.match(s):
- return True
- elif '@' in s and self._auto_email_link_re.match(s):
- return True
- return False
-
- tokens = []
- is_html_markup = False
- for token in self._sorta_html_tokenize_re.split(text):
- if is_html_markup and not _is_auto_link(token):
- sanitized = self._sanitize_html(token)
- key = _hash_text(sanitized)
- self.html_spans[key] = sanitized
- tokens.append(key)
- else:
- tokens.append(token)
- is_html_markup = not is_html_markup
- return ''.join(tokens)
-
- def _unhash_html_spans(self, text):
- for key, sanitized in self.html_spans.items():
- text = text.replace(key, sanitized)
- return text
-
- def _sanitize_html(self, s):
- if self.safe_mode == "replace":
- return self.html_removed_text
- elif self.safe_mode == "escape":
- replacements = [
- ('&', '&'),
- ('<', '<'),
- ('>', '>'),
- ]
- for before, after in replacements:
- s = s.replace(before, after)
- return s
- else:
- raise MarkdownError("invalid value for 'safe_mode': %r (must be "
- "'escape' or 'replace')" % self.safe_mode)
-
- _tail_of_inline_link_re = re.compile(r'''
- # Match tail of: [text](/url/) or [text](/url/ "title")
- \( # literal paren
- [ \t]*
- (?P<url> # \1
- <.*?>
- |
- .*?
- )
- [ \t]*
- ( # \2
- (['"]) # quote char = \3
- (?P<title>.*?)
- \3 # matching quote
- )? # title is optional
- \)
- ''', re.X | re.S)
- _tail_of_reference_link_re = re.compile(r'''
- # Match tail of: [text][id]
- [ ]? # one optional space
- (?:\n[ ]*)? # one optional newline followed by spaces
- \[
- (?P<id>.*?)
- \]
- ''', re.X | re.S)
-
- def _do_links(self, text):
- """Turn Markdown link shortcuts into XHTML <a> and <img> tags.
-
- This is a combination of Markdown.pl's _DoAnchors() and
- _DoImages(). They are done together because that simplified the
- approach. It was necessary to use a different approach than
- Markdown.pl because of the lack of atomic matching support in
- Python's regex engine used in $g_nested_brackets.
- """
- MAX_LINK_TEXT_SENTINEL = 3000 # markdown2 issue 24
-
- # `anchor_allowed_pos` is used to support img links inside
- # anchors, but not anchors inside anchors. An anchor's start
- # pos must be `>= anchor_allowed_pos`.
- anchor_allowed_pos = 0
-
- curr_pos = 0
- while True: # Handle the next link.
- # The next '[' is the start of:
- # - an inline anchor: [text](url "title")
- # - a reference anchor: [text][id]
- # - an inline img: 
- # - a reference img: ![text][id]
- # - a footnote ref: [^id]
- # (Only if 'footnotes' extra enabled)
- # - a footnote defn: [^id]: ...
- # (Only if 'footnotes' extra enabled) These have already
- # been stripped in _strip_footnote_definitions() so no
- # need to watch for them.
- # - a link definition: [id]: url "title"
- # These have already been stripped in
- # _strip_link_definitions() so no need to watch for them.
- # - not markup: [...anything else...
- try:
- start_idx = text.index('[', curr_pos)
- except ValueError:
- break
- text_length = len(text)
-
- # Find the matching closing ']'.
- # Markdown.pl allows *matching* brackets in link text so we
- # will here too. Markdown.pl *doesn't* currently allow
- # matching brackets in img alt text -- we'll differ in that
- # regard.
- bracket_depth = 0
- for p in range(start_idx+1, min(start_idx+MAX_LINK_TEXT_SENTINEL,
- text_length)):
- ch = text[p]
- if ch == ']':
- bracket_depth -= 1
- if bracket_depth < 0:
- break
- elif ch == '[':
- bracket_depth += 1
- else:
- # Closing bracket not found within sentinel length.
- # This isn't markup.
- curr_pos = start_idx + 1
- continue
- link_text = text[start_idx+1:p]
-
- # Possibly a footnote ref?
- if "footnotes" in self.extras and link_text.startswith("^"):
- normed_id = re.sub(r'\W', '-', link_text[1:])
- if normed_id in self.footnotes:
- self.footnote_ids.append(normed_id)
- result = '<sup class="footnote-ref" id="fnref-%s">' \
- '<a href="#fn-%s">%s</a></sup>' \
- % (normed_id, normed_id, len(self.footnote_ids))
- text = text[:start_idx] + result + text[p+1:]
- else:
- # This id isn't defined, leave the markup alone.
- curr_pos = p+1
- continue
-
- # Now determine what this is by the remainder.
- p += 1
- if p == text_length:
- return text
-
- # Inline anchor or img?
- if text[p] == '(': # attempt at perf improvement
- match = self._tail_of_inline_link_re.match(text, p)
- if match:
- # Handle an inline anchor or img.
- is_img = start_idx > 0 and text[start_idx-1] == "!"
- if is_img:
- start_idx -= 1
-
- url, title = match.group("url"), match.group("title")
- if url and url[0] == '<':
- url = url[1:-1] # '<url>' -> 'url'
- # We've got to encode these to avoid conflicting
- # with italics/bold.
- url = url.replace('*', g_escape_table['*']) \
- .replace('_', g_escape_table['_'])
- if title:
- title_str = ' title="%s"' \
- % title.replace('*', g_escape_table['*']) \
- .replace('_', g_escape_table['_']) \
- .replace('"', '"')
- else:
- title_str = ''
- if is_img:
- result = '<img src="%s" alt="%s"%s%s' \
- % (url.replace('"', '"'),
- link_text.replace('"', '"'),
- title_str, self.empty_element_suffix)
- curr_pos = start_idx + len(result)
- text = text[:start_idx] + result + text[match.end():]
- elif start_idx >= anchor_allowed_pos:
- result_head = '<a href="%s"%s>' % (url, title_str)
- result = '%s%s</a>' % (result_head, link_text)
- # <img> allowed from curr_pos on, <a> from
- # anchor_allowed_pos on.
- curr_pos = start_idx + len(result_head)
- anchor_allowed_pos = start_idx + len(result)
- text = text[:start_idx] + result + text[match.end():]
- else:
- # Anchor not allowed here.
- curr_pos = start_idx + 1
- continue
-
- # Reference anchor or img?
- else:
- match = self._tail_of_reference_link_re.match(text, p)
- if match:
- # Handle a reference-style anchor or img.
- is_img = start_idx > 0 and text[start_idx-1] == "!"
- if is_img:
- start_idx -= 1
- link_id = match.group("id").lower()
- if not link_id:
- link_id = link_text.lower() # for links like [this][]
- if link_id in self.urls:
- url = self.urls[link_id]
- # We've got to encode these to avoid conflicting
- # with italics/bold.
- url = url.replace('*', g_escape_table['*']) \
- .replace('_', g_escape_table['_'])
- title = self.titles.get(link_id)
- if title:
- title = title.replace('*', g_escape_table['*']) \
- .replace('_', g_escape_table['_'])
- title_str = ' title="%s"' % title
- else:
- title_str = ''
- if is_img:
- result = '<img src="%s" alt="%s"%s%s' \
- % (url.replace('"', '"'),
- link_text.replace('"', '"'),
- title_str, self.empty_element_suffix)
- curr_pos = start_idx + len(result)
- text = text[:start_idx] + result + text[match.end():]
- elif start_idx >= anchor_allowed_pos:
- result = '<a href="%s"%s>%s</a>' \
- % (url, title_str, link_text)
- result_head = '<a href="%s"%s>' % (url, title_str)
- result = '%s%s</a>' % (result_head, link_text)
- # <img> allowed from curr_pos on, <a> from
- # anchor_allowed_pos on.
- curr_pos = start_idx + len(result_head)
- anchor_allowed_pos = start_idx + len(result)
- text = text[:start_idx] + result + text[match.end():]
- else:
- # Anchor not allowed here.
- curr_pos = start_idx + 1
- else:
- # This id isn't defined, leave the markup alone.
- curr_pos = match.end()
- continue
-
- # Otherwise, it isn't markup.
- curr_pos = start_idx + 1
-
- return text
-
-
- _setext_h_re = re.compile(r'^(.+)[ \t]*\n(=+|-+)[ \t]*\n+', re.M)
- def _setext_h_sub(self, match):
- n = {"=": 1, "-": 2}[match.group(2)[0]]
- demote_headers = self.extras.get("demote-headers")
- if demote_headers:
- n = min(n + demote_headers, 6)
- return "<h%d>%s</h%d>\n\n" \
- % (n, self._run_span_gamut(match.group(1)), n)
-
- _atx_h_re = re.compile(r'''
- ^([\#=]{1,6}) # \1 = string of #'s
- [ \t]*
- (.+?) # \2 = Header text
- [ \t]*
- (?<!\\) # ensure not an escaped trailing '#'
- [\#=]* # optional closing #'s (not counted)
- \n+
- ''', re.X | re.M)
- def _atx_h_sub(self, match):
- n = len(match.group(1))
- demote_headers = self.extras.get("demote-headers")
- if demote_headers:
- n = min(n + demote_headers, 6)
- return "<h%d>%s</h%d>\n\n" \
- % (n, self._run_span_gamut(match.group(2)), n)
-
- def _do_headers(self, text):
- # Setext-style headers:
- # Header 1
- # ========
- #
- # Header 2
- # --------
- text = self._setext_h_re.sub(self._setext_h_sub, text)
-
- # atx-style headers:
- # # Header 1
- # ## Header 2
- # ## Header 2 with closing hashes ##
- # ...
- # ###### Header 6
- text = self._atx_h_re.sub(self._atx_h_sub, text)
-
- return text
-
-
- _marker_ul_chars = '*+-'
- _marker_any = r'(?:[%s]|\d+\.)' % _marker_ul_chars
- _marker_ul = '(?:[%s])' % _marker_ul_chars
- _marker_ol = r'(?:\d+\.)'
-
- def _list_sub(self, match):
- lst = match.group(1)
- lst_type = match.group(3) in self._marker_ul_chars and "ul" or "ol"
- result = self._process_list_items(lst)
- if self.list_level:
- return "<%s>\n%s</%s>\n" % (lst_type, result, lst_type)
- else:
- return "<%s>\n%s</%s>\n\n" % (lst_type, result, lst_type)
-
- def _do_lists(self, text):
- # Form HTML ordered (numbered) and unordered (bulleted) lists.
-
- for marker_pat in (self._marker_ul, self._marker_ol):
- # Re-usable pattern to match any entire ul or ol list:
- less_than_tab = self.tab_width - 1
- whole_list = r'''
- ( # \1 = whole list
- ( # \2
- [ ]{0,%d}
- (%s) # \3 = first list item marker
- [ \t]+
- )
- (?:.+?)
- ( # \4
- \Z
- |
- \n{2,}
- (?=\S)
- (?! # Negative lookahead for another list item marker
- [ \t]*
- %s[ \t]+
- )
- )
- )
- ''' % (less_than_tab, marker_pat, marker_pat)
-
- # We use a different prefix before nested lists than top-level lists.
- # See extended comment in _process_list_items().
- #
- # Note: There's a bit of duplication here. My original implementation
- # created a scalar regex pattern as the conditional result of the test on
- # $g_list_level, and then only ran the $text =~ s{...}{...}egmx
- # substitution once, using the scalar as the pattern. This worked,
- # everywhere except when running under MT on my hosting account at Pair
- # Networks. There, this caused all rebuilds to be killed by the reaper (or
- # perhaps they crashed, but that seems incredibly unlikely given that the
- # same script on the same server ran fine *except* under MT. I've spent
- # more time trying to figure out why this is happening than I'd like to
- # admit. My only guess, backed up by the fact that this workaround works,
- # is that Perl optimizes the substition when it can figure out that the
- # pattern will never change, and when this optimization isn't on, we run
- # afoul of the reaper. Thus, the slightly redundant code to that uses two
- # static s/// patterns rather than one conditional pattern.
-
- if self.list_level:
- sub_list_re = re.compile("^"+whole_list, re.X | re.M | re.S)
- text = sub_list_re.sub(self._list_sub, text)
- else:
- list_re = re.compile(r"(?:(?<=\n\n)|\A\n?)"+whole_list,
- re.X | re.M | re.S)
- text = list_re.sub(self._list_sub, text)
-
- return text
-
- _list_item_re = re.compile(r'''
- (\n)? # leading line = \1
- (^[ \t]*) # leading whitespace = \2
- (?P<marker>%s) [ \t]+ # list marker = \3
- ((?:.+?) # list item text = \4
- (\n{1,2})) # eols = \5
- (?= \n* (\Z | \2 (?P<next_marker>%s) [ \t]+))
- ''' % (_marker_any, _marker_any),
- re.M | re.X | re.S)
-
- _last_li_endswith_two_eols = False
- def _list_item_sub(self, match):
- item = match.group(4)
- leading_line = match.group(1)
- leading_space = match.group(2)
- if leading_line or "\n\n" in item or self._last_li_endswith_two_eols:
- item = self._run_block_gamut(self._outdent(item))
- else:
- # Recursion for sub-lists:
- item = self._do_lists(self._outdent(item))
- if item.endswith('\n'):
- item = item[:-1]
- item = self._run_span_gamut(item)
- self._last_li_endswith_two_eols = (len(match.group(5)) == 2)
- return "<li>%s</li>\n" % item
-
- def _process_list_items(self, list_str):
- # Process the contents of a single ordered or unordered list,
- # splitting it into individual list items.
-
- # The $g_list_level global keeps track of when we're inside a list.
- # Each time we enter a list, we increment it; when we leave a list,
- # we decrement. If it's zero, we're not in a list anymore.
- #
- # We do this because when we're not inside a list, we want to treat
- # something like this:
- #
- # I recommend upgrading to version
- # 8. Oops, now this line is treated
- # as a sub-list.
- #
- # As a single paragraph, despite the fact that the second line starts
- # with a digit-period-space sequence.
- #
- # Whereas when we're inside a list (or sub-list), that line will be
- # treated as the start of a sub-list. What a kludge, huh? This is
- # an aspect of Markdown's syntax that's hard to parse perfectly
- # without resorting to mind-reading. Perhaps the solution is to
- # change the syntax rules such that sub-lists must start with a
- # starting cardinal number; e.g. "1." or "a.".
- self.list_level += 1
- self._last_li_endswith_two_eols = False
- list_str = list_str.rstrip('\n') + '\n'
- list_str = self._list_item_re.sub(self._list_item_sub, list_str)
- self.list_level -= 1
- return list_str
-
- def _get_pygments_lexer(self, lexer_name):
- try:
- from pygments import lexers, util
- except ImportError:
- return None
- try:
- return lexers.get_lexer_by_name(lexer_name)
- except util.ClassNotFound:
- return None
-
- def _color_with_pygments(self, codeblock, lexer, **formatter_opts):
- import pygments
- import pygments.formatters
-
- class HtmlCodeFormatter(pygments.formatters.HtmlFormatter):
- def _wrap_code(self, inner):
- """A function for use in a Pygments Formatter which
- wraps in <code> tags.
- """
- yield 0, "<code>"
- for tup in inner:
- yield tup
- yield 0, "</code>"
-
- def wrap(self, source, outfile):
- """Return the source with a code, pre, and div."""
- return self._wrap_div(self._wrap_pre(self._wrap_code(source)))
-
- formatter = HtmlCodeFormatter(cssclass="codehilite", **formatter_opts)
- return pygments.highlight(codeblock, lexer, formatter)
-
- def _code_block_sub(self, match):
- codeblock = match.group(1)
- codeblock = self._outdent(codeblock)
- codeblock = self._detab(codeblock)
- codeblock = codeblock.lstrip('\n') # trim leading newlines
- codeblock = codeblock.rstrip() # trim trailing whitespace
-
- if "code-color" in self.extras and codeblock.startswith(":::"):
- lexer_name, rest = codeblock.split('\n', 1)
- lexer_name = lexer_name[3:].strip()
- lexer = self._get_pygments_lexer(lexer_name)
- codeblock = rest.lstrip("\n") # Remove lexer declaration line.
- if lexer:
- formatter_opts = self.extras['code-color'] or {}
- colored = self._color_with_pygments(codeblock, lexer,
- **formatter_opts)
- return "\n\n%s\n\n" % colored
-
- codeblock = self._encode_code(codeblock)
- return "\n\n<pre><code>%s\n</code></pre>\n\n" % codeblock
-
- def _do_code_blocks(self, text):
- """Process Markdown `<pre><code>` blocks."""
- code_block_re = re.compile(r'''
- (?:\n\n|\A)
- ( # $1 = the code block -- one or more lines, starting with a space/tab
- (?:
- (?:[ ]{%d} | \t) # Lines must start with a tab or a tab-width of spaces
- .*\n+
- )+
- )
- ((?=^[ ]{0,%d}\S)|\Z) # Lookahead for non-space at line-start, or end of doc
- ''' % (self.tab_width, self.tab_width),
- re.M | re.X)
-
- return code_block_re.sub(self._code_block_sub, text)
-
-
- # Rules for a code span:
- # - backslash escapes are not interpreted in a code span
- # - to include one or or a run of more backticks the delimiters must
- # be a longer run of backticks
- # - cannot start or end a code span with a backtick; pad with a
- # space and that space will be removed in the emitted HTML
- # See `test/tm-cases/escapes.text` for a number of edge-case
- # examples.
- _code_span_re = re.compile(r'''
- (?<!\\)
- (`+) # \1 = Opening run of `
- (?!`) # See Note A test/tm-cases/escapes.text
- (.+?) # \2 = The code block
- (?<!`)
- \1 # Matching closer
- (?!`)
- ''', re.X | re.S)
-
- def _code_span_sub(self, match):
- c = match.group(2).strip(" \t")
- c = self._encode_code(c)
- return "<code>%s</code>" % c
-
- def _do_code_spans(self, text):
- # * Backtick quotes are used for <code></code> spans.
- #
- # * You can use multiple backticks as the delimiters if you want to
- # include literal backticks in the code span. So, this input:
- #
- # Just type ``foo `bar` baz`` at the prompt.
- #
- # Will translate to:
- #
-
# <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
- #
- # There's no arbitrary limit to the number of backticks you
- # can use as delimters. If you need three consecutive backticks
- # in your code, use four for delimiters, etc.
- #
- # * You can use spaces to get literal backticks at the edges:
- #
- # ... type `` `bar` `` ...
- #
- # Turns to:
- #
- # ... type <code>`bar`</code> ...
- return self._code_span_re.sub(self._code_span_sub, text)
-
- def _encode_code(self, text):
- """Encode/escape certain characters inside Markdown code runs.
- The point is that in code, these characters are literals,
- and lose their special Markdown meanings.
- """
- replacements = [
- # Encode all ampersands; HTML entities are not
- # entities within a Markdown code span.
- ('&', '&'),
- # Do the angle bracket song and dance:
- ('<', '<'),
- ('>', '>'),
- # Now, escape characters that are magic in Markdown:
- ('*', g_escape_table['*']),
- ('_', g_escape_table['_']),
- ('{', g_escape_table['{']),
- ('}', g_escape_table['}']),
- ('[', g_escape_table['[']),
- (']', g_escape_table[']']),
- ('\\', g_escape_table['\\']),
- ]
- for before, after in replacements:
- text = text.replace(before, after)
- return text
-
- _strong_re = re.compile(r"(\*\*|__)(?=\S)(.+?[*_]*)(?<=\S)\1", re.S)
- _em_re = re.compile(r"(\*|_)(?=\S)(.+?)(?<=\S)\1", re.S)
- _code_friendly_strong_re = re.compile(r"\*\*(?=\S)(.+?[*_]*)(?<=\S)\*\*", re.S)
- _code_friendly_em_re = re.compile(r"\*(?=\S)(.+?)(?<=\S)\*", re.S)
- def _do_italics_and_bold(self, text):
- # <strong> must go first:
- if "code-friendly" in self.extras:
- text = self._code_friendly_strong_re.sub(r"<strong>\1</strong>", text)
- text = self._code_friendly_em_re.sub(r"<em>\1</em>", text)
- else:
- text = self._strong_re.sub(r"<strong>\2</strong>", text)
- text = self._em_re.sub(r"<em>\2</em>", text)
- return text
-
-
- _block_quote_re = re.compile(r'''
- ( # Wrap whole match in \1
- (
- ^[ \t]*>[ \t]? # '>' at the start of a line
- .+\n # rest of the first line
- (.+\n)* # subsequent consecutive lines
- \n* # blanks
- )+
- )
- ''', re.M | re.X)
- _bq_one_level_re = re.compile('^[ \t]*>[ \t]?', re.M);
-
- _html_pre_block_re = re.compile(r'(\s*<pre>.+?</pre>)', re.S)
- def _dedent_two_spaces_sub(self, match):
- return re.sub(r'(?m)^ ', '', match.group(1))
-
- def _block_quote_sub(self, match):
- bq = match.group(1)
- bq = self._bq_one_level_re.sub('', bq) # trim one level of quoting
- bq = self._ws_only_line_re.sub('', bq) # trim whitespace-only lines
- bq = self._run_block_gamut(bq) # recurse
-
- bq = re.sub('(?m)^', ' ', bq)
- # These leading spaces screw with <pre> content, so we need to fix that:
- bq = self._html_pre_block_re.sub(self._dedent_two_spaces_sub, bq)
-
- return "<blockquote>\n%s\n</blockquote>\n\n" % bq
-
- def _do_block_quotes(self, text):
- if '>' not in text:
- return text
- return self._block_quote_re.sub(self._block_quote_sub, text)
-
- def _form_paragraphs(self, text):
- # Strip leading and trailing lines:
- text = text.strip('\n')
-
- # Wrap <p> tags.
- grafs = []
- for i, graf in enumerate(re.split(r"\n{2,}", text)):
- if graf in self.html_blocks:
- # Unhashify HTML blocks
- grafs.append(self.html_blocks[graf])
- else:
- cuddled_list = None
- if "cuddled-lists" in self.extras:
- # Need to put back trailing '\n' for `_list_item_re`
- # match at the end of the paragraph.
- li = self._list_item_re.search(graf + '\n')
- # Two of the same list marker in this paragraph: a likely
- # candidate for a list cuddled to preceding paragraph
- # text (issue 33). Note the `[-1]` is a quick way to
- # consider numeric bullets (e.g. "1." and "2.") to be
- # equal.
- if (li and li.group("next_marker")
- and li.group("marker")[-1] == li.group("next_marker")[-1]):
- start = li.start()
- cuddled_list = self._do_lists(graf[start:]).rstrip("\n")
- assert cuddled_list.startswith("<ul>") or cuddled_list.startswith("<ol>")
- graf = graf[:start]
-
- # Wrap <p> tags.
- graf = self._run_span_gamut(graf)
- grafs.append("<p>" + graf.lstrip(" \t") + "</p>")
-
- if cuddled_list:
- grafs.append(cuddled_list)
-
- return "\n\n".join(grafs)
-
- def _add_footnotes(self, text):
- if self.footnotes:
- footer = [
- '<div class="footnotes">',
- '<hr' + self.empty_element_suffix,
- '<ol>',
- ]
- for i, id in enumerate(self.footnote_ids):
- if i != 0:
- footer.append('')
- footer.append('<li id="fn-%s">' % id)
- footer.append(self._run_block_gamut(self.footnotes[id]))
- backlink = ('<a href="#fnref-%s" '
- 'class="footnoteBackLink" '
- 'title="Jump back to footnote %d in the text.">'
- '↩</a>' % (id, i+1))
- if footer[-1].endswith("</p>"):
- footer[-1] = footer[-1][:-len("</p>")] \
- + ' ' + backlink + "</p>"
- else:
- footer.append("\n<p>%s</p>" % backlink)
- footer.append('</li>')
- footer.append('</ol>')
- footer.append('</div>')
- return text + '\n\n' + '\n'.join(footer)
- else:
- return text
-
- # Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
- # http://bumppo.net/projects/amputator/
- _ampersand_re = re.compile(r'&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)')
- _naked_lt_re = re.compile(r'<(?![a-z/?\$!])', re.I)
- _naked_gt_re = re.compile(r'''(?<![a-z?!/'"-])>''', re.I)
-
- def _encode_amps_and_angles(self, text):
- # Smart processing for ampersands and angle brackets that need
- # to be encoded.
- text = self._ampersand_re.sub('&', text)
-
- # Encode naked <'s
- text = self._naked_lt_re.sub('<', text)
-
- # Encode naked >'s
- # Note: Other markdown implementations (e.g. Markdown.pl, PHP
- # Markdown) don't do this.
- text = self._naked_gt_re.sub('>', text)
- return text
-
- def _encode_backslash_escapes(self, text):
- for ch, escape in g_escape_table.items():
- text = text.replace("\\"+ch, escape)
- return text
-
- _auto_link_re = re.compile(r'<((https?|ftp):[^\'">\s]+)>', re.I)
- def _auto_link_sub(self, match):
- g1 = match.group(1)
- return '<a href="%s">%s</a>' % (g1, g1)
-
- _auto_email_link_re = re.compile(r"""
- <
- (?:mailto:)?
- (
- [-.\w]+
- \@
- [-\w]+(\.[-\w]+)*\.[a-z]+
- )
- >
- """, re.I | re.X | re.U)
- def _auto_email_link_sub(self, match):
- return self._encode_email_address(
- self._unescape_special_chars(match.group(1)))
-
- def _do_auto_links(self, text):
- text = self._auto_link_re.sub(self._auto_link_sub, text)
- text = self._auto_email_link_re.sub(self._auto_email_link_sub, text)
- return text
-
- def _encode_email_address(self, addr):
- # Input: an email address, e.g. "foo@example.com"
- #
- # Output: the email address as a mailto link, with each character
- # of the address encoded as either a decimal or hex entity, in
- # the hopes of foiling most address harvesting spam bots. E.g.:
- #
-
# <a href="mailto:foo@e
- # xample.com">foo
- # @example.com</a>
- #
- # Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
- # mailing list: <http://tinyurl.com/yu7ue>
- chars = [_xml_encode_email_char_at_random(ch)
- for ch in "mailto:" + addr]
- # Strip the mailto: from the visible part.
- addr = '<a href="%s">%s</a>' \
- % (''.join(chars), ''.join(chars[7:]))
- return addr
-
- def _do_link_patterns(self, text):
- """Caveat emptor: there isn't much guarding against link
- patterns being formed inside other standard Markdown links, e.g.
- inside a [link def][like this].
-
- Dev Notes: *Could* consider prefixing regexes with a negative
- lookbehind assertion to attempt to guard against this.
- """
- link_from_hash = {}
- for regex, repl in self.link_patterns:
- replacements = []
- for match in regex.finditer(text):
- if hasattr(repl, "__call__"):
- href = repl(match)
- else:
- href = match.expand(repl)
- replacements.append((match.span(), href))
- for (start, end), href in reversed(replacements):
- escaped_href = (
- href.replace('"', '"') # b/c of attr quote
- # To avoid markdown <em> and <strong>:
- .replace('*', g_escape_table['*'])
- .replace('_', g_escape_table['_']))
- link = '<a href="%s">%s</a>' % (escaped_href, text[start:end])
- hash = _hash_text(link)
- link_from_hash[hash] = link
- text = text[:start] + hash + text[end:]
- for hash, link in link_from_hash.items():
- text = text.replace(hash, link)
- return text
-
- def _unescape_special_chars(self, text):
- # Swap back in all the special characters we've hidden.
- for ch, hash in g_escape_table.items():
- text = text.replace(hash, ch)
- return text
-
- def _outdent(self, text):
- # Remove one level of line-leading tabs or spaces
- return self._outdent_re.sub('', text)
+ # The dict of "extras" to enable in processing -- a mapping of
+ # extra name to argument for the extra. Most extras do not have an
+ # argument, in which case the value is None.
+ #
+ # This can be set via (a) subclassing and (b) the constructor
+ # "extras" argument.
+ extras = None
+
+ urls = None
+ titles = None
+ html_blocks = None
+ html_spans = None
+ html_removed_text = "[HTML_REMOVED]" # for compat with markdown.py
+
+ # Used to track when we're inside an ordered or unordered list
+ # (see _ProcessListItems() for details):
+ list_level = 0
+
+ _ws_only_line_re = re.compile(r"^[ \t]+$", re.M)
+
+ def __init__(self, html4tags=False, tab_width=4, safe_mode=None,
+ extras=None, link_patterns=None):
+ if html4tags:
+ self.empty_element_suffix = ">"
+ else:
+ self.empty_element_suffix = " />"
+ self.tab_width = tab_width
+
+ # For compatibility with earlier markdown2.py and with
+ # markdown.py's safe_mode being a boolean,
+ # safe_mode == True -> "replace"
+ if safe_mode is True:
+ self.safe_mode = "replace"
+ else:
+ self.safe_mode = safe_mode
+
+ if self.extras is None:
+ self.extras = {}
+ elif not isinstance(self.extras, dict):
+ self.extras = dict([(e, None) for e in self.extras])
+ if extras:
+ if not isinstance(extras, dict):
+ extras = dict([(e, None) for e in extras])
+ self.extras.update(extras)
+ assert isinstance(self.extras, dict)
+ self._instance_extras = self.extras.copy()
+ self.link_patterns = link_patterns
+ self._outdent_re = re.compile(r'^(\t|[ ]{1,%d})' % tab_width, re.M)
+
+ def reset(self):
+ self.urls = {}
+ self.titles = {}
+ self.html_blocks = {}
+ self.html_spans = {}
+ self.list_level = 0
+ self.extras = self._instance_extras.copy()
+ self.encoding = 'utf-8'
+ if "footnotes" in self.extras:
+ self.footnotes = {}
+ self.footnote_ids = []
+
+ def convert(self, text, encoding=None):
+ """Convert the given text."""
+ # Main function. The order in which other subs are called here is
+ # essential. Link and image substitutions need to happen before
+
# _EscapeSpecialChars(), so that any *'s or _'s in the <a>
+
# and <img> tags get encoded.
+
+ # Clear the global hashes. If we don't clear these, you get conflicts
+ # from other articles when generating a page which contains more than
+ # one article (e.g. an index page that shows the N most recent
+ # articles):
+ self.reset()
+ if encoding:
+ self.encoding = encoding
+
+ if not isinstance(text, unicode):
+ text = unicode(text, self.encoding)
+
+ # Standardize line endings:
+ #text = re.sub("\r\n|\r", "\n", text)
+
+ # Make sure $text ends with a couple of newlines:
+ text += "\n\n"
+
+ # Convert all tabs to spaces.
+ text = self._detab(text)
+
+ # Strip any lines consisting only of spaces and tabs.
+ # This makes subsequent regexen easier to write, because we can
+ # match consecutive blank lines with /\n+/ instead of something
+ # contorted like /[ \t]*\n+/ .
+ text = self._ws_only_line_re.sub("", text)
+
+ if self.safe_mode:
+ text = self._hash_html_spans(text)
+
+ # Turn block-level HTML blocks into hash entries
+ text = self._hash_html_blocks(text, raw=True)
+
+ # Strip link definitions, store in hashes.
+ if "footnotes" in self.extras:
+ # Must do footnotes first because an unlucky footnote defn
+ # looks like a link defn:
+ # [^4]: this "looks like a link defn"
+ text = self._strip_footnote_definitions(text)
+ text = self._strip_link_definitions(text)
+
+ text = self._run_block_gamut(text)
+
+ if "footnotes" in self.extras:
+ text = self._add_footnotes(text)
+
+ text = self._unescape_special_chars(text)
+
+ if self.safe_mode:
+ text = self._unhash_html_spans(text)
+
+ text += "\n"
+ return text
+
+ # Cribbed from a post by Bart Lateur:
+ # <http://www.nntp.perl.org/group/perl.macperl.anyperl/154>
+ _detab_re = re.compile(r'(.*?)\t', re.M)
+ def _detab_sub(self, match):
+ g1 = match.group(1)
+ return g1 + (' ' * (self.tab_width - len(g1) % self.tab_width))
+ def _detab(self, text):
+ r"""Remove (leading?) tabs from a file.
+
+ >>> m = Markdown()
+ >>> m._detab("\tfoo")
+ ' foo'
+ >>> m._detab(" \tfoo")
+ ' foo'
+ >>> m._detab("\t foo")
+ ' foo'
+ >>> m._detab(" foo")
+ ' foo'
+ >>> m._detab(" foo\n\tbar\tblam")
+ ' foo\n bar blam'
+ """
+ if '\t' not in text:
+ return text
+ return self._detab_re.subn(self._detab_sub, text)[0]
+
+ _block_tags_a = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del'
+ _strict_tag_block_re = re.compile(r"""
+ ( # save in \1
+ ^ # start of line (with re.M)
+ <(%s) # start tag = \2
+ \b # word break
+ (.*\n)*? # any number of lines, minimally matching
+ </\2> # the matching end tag
+ [ \t]* # trailing spaces/tabs
+ (?=\n+|\Z) # followed by a newline or end of document
+ )
+ """ % _block_tags_a,
+ re.X | re.M)
+
+ _block_tags_b = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math'
+ _liberal_tag_block_re = re.compile(r"""
+ ( # save in \1
+ ^ # start of line (with re.M)
+ <(%s) # start tag = \2
+ \b # word break
+ (.*\n)*? # any number of lines, minimally matching
+ .*</\2> # the matching end tag
+ [ \t]* # trailing spaces/tabs
+ (?=\n+|\Z) # followed by a newline or end of document
+ )
+ """ % _block_tags_b,
+ re.X | re.M)
+
+ def _hash_html_block_sub(self, match, raw=False):
+ html = match.group(1)
+ if raw and self.safe_mode:
+ html = self._sanitize_html(html)
+ key = _hash_text(html)
+ self.html_blocks[key] = html
+ return "\n\n" + key + "\n\n"
+
+ def _hash_html_blocks(self, text, raw=False):
+ """Hashify HTML blocks
+
+ We only want to do this for block-level HTML tags, such as headers,
+
lists, and tables. That's because we still want to wrap <p>s around
+ "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+ phrase emphasis, and spans. The list of tags we're looking for is
+ hard-coded.
+
+ @param raw {boolean} indicates if these are raw HTML blocks in
+ the original source. It makes a difference in "safe" mode.
+ """
+ if '<' not in text:
+ return text
+
+ # Pass `raw` value into our calls to self._hash_html_block_sub.
+ hash_html_block_sub = _curry(self._hash_html_block_sub, raw=raw)
+
+ # First, look for nested blocks, e.g.:
+ # tags for inner block must be indented.
+ # </div>
+ # </div>
+ #
+ # The outermost tags must start at the left margin for this to match, and
+ # the inner nested divs must be indented.
+ # We need to do this before the next, more liberal match, because the next
+
# match will start at the first `<div>` and stop at the first `</div>`.
+ text = self._strict_tag_block_re.sub(hash_html_block_sub, text)
+
+ # Now match more liberally, simply from `\n<tag>` to `</tag>\n`
+ text = self._liberal_tag_block_re.sub(hash_html_block_sub, text)
+
+ # Special case just for <hr />. It was easier to make a special
+ # case than to make the other regex more complicated.
+ if "<hr" in text:
+ _hr_tag_re = _hr_tag_re_from_tab_width(self.tab_width)
+ text = _hr_tag_re.sub(hash_html_block_sub, text)
+
+ # Special case for standalone HTML comments:
+ if "<!--" in text:
+ start = 0
+ while True:
+ # Delimiters for next comment block.
+ try:
+ start_idx = text.index("<!--", start)
+ except ValueError, ex:
+ break
+ try:
+ end_idx = text.index("-->", start_idx) + 3
+ except ValueError, ex:
+ break
+
+ # Start position for next comment block search.
+ start = end_idx
+
+ # Validate whitespace before comment.
+ if start_idx:
+ # - Up to `tab_width - 1` spaces before start_idx.
+ for i in range(self.tab_width - 1):
+ if text[start_idx - 1] != ' ':
+ break
+ start_idx -= 1
+ if start_idx == 0:
+ break
+ # - Must be preceded by 2 newlines or hit the start of
+ # the document.
+ if start_idx == 0:
+ pass
+ elif start_idx == 1 and text[0] == '\n':
+ start_idx = 0 # to match minute detail of Markdown.pl regex
+ elif text[start_idx-2:start_idx] == '\n\n':
+ pass
+ else:
+ break
+
+ # Validate whitespace after comment.
+ # - Any number of spaces and tabs.
+ while end_idx < len(text):
+ if text[end_idx] not in ' \t':
+ break
+ end_idx += 1
+ # - Must be following by 2 newlines or hit end of text.
+ if text[end_idx:end_idx+2] not in ('', '\n', '\n\n'):
+ continue
+
+ # Escape and hash (must match `_hash_html_block_sub`).
+ html = text[start_idx:end_idx]
+ if raw and self.safe_mode:
+ html = self._sanitize_html(html)
+ key = _hash_text(html)
+ self.html_blocks[key] = html
+ text = text[:start_idx] + "\n\n" + key + "\n\n" + text[end_idx:]
+
+ if "xml" in self.extras:
+ # Treat XML processing instructions and namespaced one-liner
+ # tags as if they were block HTML tags. E.g., if standalone
+ # (i.e. are their own paragraph), the following do not get
+
# wrapped in a <p> tag:
+ # <?foo bar?>
+ #
+ # <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="chapter_1.md"/>
+ _xml_oneliner_re = _xml_oneliner_re_from_tab_width(self.tab_width)
+ text = _xml_oneliner_re.sub(hash_html_block_sub, text)
+
+ return text
+
+ def _strip_link_definitions(self, text):
+ # Strips link definitions from text, stores the URLs and titles in
+ # hash references.
+ less_than_tab = self.tab_width - 1
+
+ # Link defs are in the form:
+ # [id]: url "optional title"
+ _link_def_re = re.compile(r"""
+ ^[ ]{0,%d}\[(.+)\]: # id = \1
+ [ \t]*
+ \n? # maybe *one* newline
+ [ \t]*
+ <?(.+?)>? # url = \2
+ [ \t]*
+ (?:
+ \n? # maybe one newline
+ [ \t]*
+ (?<=\s) # lookbehind for whitespace
+ ['"(]
+ ([^\n]*) # title = \3
+ ['")]
+ [ \t]*
+ )? # title is optional
+ (?:\n+|\Z)
+ """ % less_than_tab, re.X | re.M | re.U)
+ return _link_def_re.sub(self._extract_link_def_sub, text)
+
+ def _extract_link_def_sub(self, match):
+ id, url, title = match.groups()
+ key = id.lower() # Link IDs are case-insensitive
+ self.urls[key] = self._encode_amps_and_angles(url)
+ if title:
+ self.titles[key] = title.replace('"', '"')
+ return ""
+
+ def _extract_footnote_def_sub(self, match):
+ id, text = match.groups()
+ text = _dedent(text, skip_first_line=not text.startswith('\n')).strip()
+ normed_id = re.sub(r'\W', '-', id)
+ # Ensure footnote text ends with a couple newlines (for some
+ # block gamut matches).
+ self.footnotes[normed_id] = text + "\n\n"
+ return ""
+
+ def _strip_footnote_definitions(self, text):
+ """A footnote definition looks like this:
+
+ [^note-id]: Text of the note.
+
+ May include one or more indented paragraphs.
+
+ Where,
+ - The 'note-id' can be pretty much anything, though typically it
+ is the number of the footnote.
+ - The first paragraph may start on the next line, like so:
+
+ [^note-id]:
+ Text of the note.
+ """
+ less_than_tab = self.tab_width - 1
+ footnote_def_re = re.compile(r'''
+ ^[ ]{0,%d}\[\^(.+)\]: # id = \1
+ [ \t]*
+ ( # footnote text = \2
+ # First line need not start with the spaces.
+ (?:\s*.*\n+)
+ (?:
+ (?:[ ]{%d} | \t) # Subsequent lines must be indented.
+ .*\n+
+ )*
+ )
+ # Lookahead for non-space at line-start, or end of doc.
+ (?:(?=^[ ]{0,%d}\S)|\Z)
+ ''' % (less_than_tab, self.tab_width, self.tab_width),
+ re.X | re.M)
+ return footnote_def_re.sub(self._extract_footnote_def_sub, text)
+
+
+ _hr_res = [
+ re.compile(r"^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$", re.M),
+ re.compile(r"^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$", re.M),
+ re.compile(r"^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$", re.M),
+ ]
+
+ def _run_block_gamut(self, text):
+ # These are all the transformations that form block-level
+ # tags like paragraphs, headers, and list items.
+
+ text = self._do_headers(text)
+
+ # Do Horizontal Rules:
+ hr = "\n<hr"+self.empty_element_suffix+"\n"
+ for hr_re in self._hr_res:
+ text = hr_re.sub(hr, text)
+
+ text = self._do_lists(text)
+
+ if "pyshell" in self.extras:
+ text = self._prepare_pyshell_blocks(text)
+
+ text = self._do_code_blocks(text)
+
+ text = self._do_block_quotes(text)
+
+ # We already ran _HashHTMLBlocks() before, in Markdown(), but that
+ # was to escape raw HTML in the original Markdown source. This time,
+ # we're escaping the markup we've just created, so that we don't wrap
+
# <p> tags around block-level tags.
+ text = self._hash_html_blocks(text)
+
+ text = self._form_paragraphs(text)
+
+ return text
+
+ def _pyshell_block_sub(self, match):
+ lines = match.group(0).splitlines(0)
+ _dedentlines(lines)
+ indent = ' ' * self.tab_width
+ s = ('\n' # separate from possible cuddled paragraph
+ + indent + ('\n'+indent).join(lines)
+ + '\n\n')
+ return s
+
+ def _prepare_pyshell_blocks(self, text):
+ """Ensure that Python interactive shell sessions are put in
+ code blocks -- even if not properly indented.
+ """
+ if ">>>" not in text:
+ return text
+
+ less_than_tab = self.tab_width - 1
+ _pyshell_block_re = re.compile(r"""
+ ^([ ]{0,%d})>>>[ ].*\n # first line
+ ^(\1.*\S+.*\n)* # any number of subsequent lines
+ ^\n # ends with a blank line
+ """ % less_than_tab, re.M | re.X)
+
+ return _pyshell_block_re.sub(self._pyshell_block_sub, text)
+
+ def _run_span_gamut(self, text):
+ # These are all the transformations that occur *within* block-level
+ # tags like paragraphs, headers, and list items.
+
+ text = self._do_code_spans(text)
+
+ text = self._escape_special_chars(text)
+
+ # Process anchor and image tags.
+ #text = self._do_links(text)
+
+ # Make links out of things like `<http://example.com/>`
+ # Must come after _do_links(), because you can use < and >
+ # delimiters in inline links like [this](<url>).
+ text = self._do_auto_links(text)
+
+ if "link-patterns" in self.extras:
+ text = self._do_link_patterns(text)
+
+ text = self._encode_amps_and_angles(text)
+
+ text = self._do_italics_and_bold(text)
+
+ # Do hard breaks:
+ text = re.sub(r" {2,}\n", " <br%s\n" % self.empty_element_suffix, text)
+
+ return text
+
+ # "Sorta" because auto-links are identified as "tag" tokens.
+ _sorta_html_tokenize_re = re.compile(r"""
+ (
+ # tag
+ </?
+ (?:\w+) # tag name
+ (?:\s+(?:[\w-]+:)?[\w-]+=(?:".*?"|'.*?'))* # attributes
+ \s*/?>
+ |
+ # auto-link (e.g., <http://www.activestate.com/>)
+ <\w+[^>]*>
+ |
+ <!--.*?--> # comment
+ |
+ <\?.*?\?> # processing instruction
+ )
+ """, re.X)
+
+ def _escape_special_chars(self, text):
+ # Python markdown note: the HTML tokenization here differs from
+ # that in Markdown.pl, hence the behaviour for subtle cases can
+ # differ (I believe the tokenizer here does a better job because
+ # it isn't susceptible to unmatched '<' and '>' in HTML tags).
+ # Note, however, that '>' is not allowed in an auto-link URL
+ # here.
+ escaped = []
+ is_html_markup = False
+ for token in self._sorta_html_tokenize_re.split(text):
+ if is_html_markup:
+ # Within tags/HTML-comments/auto-links, encode * and _
+ # so they don't conflict with their use in Markdown for
+ # italics and strong. We're replacing each such
+ # character with its corresponding MD5 checksum value;
+ # this is likely overkill, but it should prevent us from
+ # colliding with the escape values by accident.
+ escaped.append(token.replace('*', g_escape_table['*'])
+ .replace('_', g_escape_table['_']))
+ else:
+ escaped.append(self._encode_backslash_escapes(token))
+ is_html_markup = not is_html_markup
+ return ''.join(escaped)
+
+ def _hash_html_spans(self, text):
+ # Used for safe_mode.
+
+ def _is_auto_link(s):
+ if ':' in s and self._auto_link_re.match(s):
+ return True
+ elif '@' in s and self._auto_email_link_re.match(s):
+ return True
+ return False
+
+ tokens = []
+ is_html_markup = False
+ for token in self._sorta_html_tokenize_re.split(text):
+ if is_html_markup and not _is_auto_link(token):
+ sanitized = self._sanitize_html(token)
+ key = _hash_text(sanitized)
+ self.html_spans[key] = sanitized
+ tokens.append(key)
+ else:
+ tokens.append(token)
+ is_html_markup = not is_html_markup
+ return ''.join(tokens)
+
+ def _unhash_html_spans(self, text):
+ for key, sanitized in self.html_spans.items():
+ text = text.replace(key, sanitized)
+ return text
+
+ def _sanitize_html(self, s):
+ if self.safe_mode == "replace":
+ return self.html_removed_text
+ elif self.safe_mode == "escape":
+ replacements = [
+ ('&', '&'),
+ ('<', '<'),
+ ('>', '>'),
+ ]
+ for before, after in replacements:
+ s = s.replace(before, after)
+ return s
+ else:
+ raise MarkdownError("invalid value for 'safe_mode': %r (must be "
+ "'escape' or 'replace')" % self.safe_mode)
+
+ _tail_of_inline_link_re = re.compile(r'''
+ # Match tail of: [text](/url/) or [text](/url/ "title")
+ \( # literal paren
+ [ \t]*
+ (?P<url> # \1
+ <.*?>
+ |
+ .*?
+ )
+ [ \t]*
+ ( # \2
+ (['"]) # quote char = \3
+ (?P<title>.*?)
+ \3 # matching quote
+ )? # title is optional
+ \)
+ ''', re.X | re.S)
+ _tail_of_reference_link_re = re.compile(r'''
+ # Match tail of: [text][id]
+ [ ]? # one optional space
+ (?:\n[ ]*)? # one optional newline followed by spaces
+ \[
+ (?P<id>.*?)
+ \]
+ ''', re.X | re.S)
+
+ def _do_links(self, text):
+
"""Turn Markdown link shortcuts into XHTML <a> and <img> tags.
+
+ This is a combination of Markdown.pl's _DoAnchors() and
+ _DoImages(). They are done together because that simplified the
+ approach. It was necessary to use a different approach than
+ Markdown.pl because of the lack of atomic matching support in
+ Python's regex engine used in $g_nested_brackets.
+ """
+ MAX_LINK_TEXT_SENTINEL = 3000 # markdown2 issue 24
+
+ # `anchor_allowed_pos` is used to support img links inside
+ # anchors, but not anchors inside anchors. An anchor's start
+ # pos must be `>= anchor_allowed_pos`.
+ anchor_allowed_pos = 0
+
+ curr_pos = 0
+ while True: # Handle the next link.
+ # The next '[' is the start of:
+ # - an inline anchor: [text](url "title")
+ # - a reference anchor: [text][id]
+ # - an inline img: 
+ # - a reference img: ![text][id]
+ # - a footnote ref: [^id]
+ # (Only if 'footnotes' extra enabled)
+ # - a footnote defn: [^id]: ...
+ # (Only if 'footnotes' extra enabled) These have already
+ # been stripped in _strip_footnote_definitions() so no
+ # need to watch for them.
+ # - a link definition: [id]: url "title"
+ # These have already been stripped in
+ # _strip_link_definitions() so no need to watch for them.
+ # - not markup: [...anything else...
+ try:
+ start_idx = text.index('[', curr_pos)
+ except ValueError:
+ break
+ text_length = len(text)
+
+ # Find the matching closing ']'.
+ # Markdown.pl allows *matching* brackets in link text so we
+ # will here too. Markdown.pl *doesn't* currently allow
+ # matching brackets in img alt text -- we'll differ in that
+ # regard.
+ bracket_depth = 0
+ for p in range(start_idx+1, min(start_idx+MAX_LINK_TEXT_SENTINEL,
+ text_length)):
+ ch = text[p]
+ if ch == ']':
+ bracket_depth -= 1
+ if bracket_depth < 0:
+ break
+ elif ch == '[':
+ bracket_depth += 1
+ else:
+ # Closing bracket not found within sentinel length.
+ # This isn't markup.
+ curr_pos = start_idx + 1
+ continue
+ link_text = text[start_idx+1:p]
+
+ # Possibly a footnote ref?
+ if "footnotes" in self.extras and link_text.startswith("^"):
+ normed_id = re.sub(r'\W', '-', link_text[1:])
+ if normed_id in self.footnotes:
+ self.footnote_ids.append(normed_id)
+ result = '<sup class="footnote-ref" id="fnref-%s">' \
+
'<a href="#fn-%s">%s</a></sup>' \
+ % (normed_id, normed_id, len(self.footnote_ids))
+ text = text[:start_idx] + result + text[p+1:]
+ else:
+ # This id isn't defined, leave the markup alone.
+ curr_pos = p+1
+ continue
+
+ # Now determine what this is by the remainder.
+ p += 1
+ if p == text_length:
+ return text
+
+ # Inline anchor or img?
+ if text[p] == '(': # attempt at perf improvement
+ match = self._tail_of_inline_link_re.match(text, p)
+ if match:
+ # Handle an inline anchor or img.
+ is_img = start_idx > 0 and text[start_idx-1] == "!"
+ if is_img:
+ start_idx -= 1
+
+ url, title = match.group("url"), match.group("title")
+ if url and url[0] == '<':
+ url = url[1:-1] # '<url>' -> 'url'
+ # We've got to encode these to avoid conflicting
+ # with italics/bold.
+ url = url.replace('*', g_escape_table['*']) \
+ .replace('_', g_escape_table['_'])
+ if title:
+ title_str = ' title="%s"' \
+ % title.replace('*', g_escape_table['*']) \
+ .replace('_', g_escape_table['_']) \
+ .replace('"', '"')
+ else:
+ title_str = ''
+ if is_img:
+
result = '<img src="%s" alt="%s"%s%s' \
+ % (url.replace('"', '"'),
+ link_text.replace('"', '"'),
+ title_str, self.empty_element_suffix)
+ curr_pos = start_idx + len(result)
+ text = text[:start_idx] + result + text[match.end():]
+ elif start_idx >= anchor_allowed_pos:
+
result_head = '<a href="%s"%s>' % (url, title_str)
+ result = '%s%s</a>' % (result_head, link_text)
+
# <img> allowed from curr_pos on, <a> from
+ # anchor_allowed_pos on.
+ curr_pos = start_idx + len(result_head)
+ anchor_allowed_pos = start_idx + len(result)
+ text = text[:start_idx] + result + text[match.end():]
+ else:
+ # Anchor not allowed here.
+ curr_pos = start_idx + 1
+ continue
+
+ # Reference anchor or img?
+ else:
+ match = self._tail_of_reference_link_re.match(text, p)
+ if match:
+ # Handle a reference-style anchor or img.
+ is_img = start_idx > 0 and text[start_idx-1] == "!"
+ if is_img:
+ start_idx -= 1
+ link_id = match.group("id").lower()
+ if not link_id:
+ link_id = link_text.lower() # for links like [this][]
+ if link_id in self.urls:
+ url = self.urls[link_id]
+ # We've got to encode these to avoid conflicting
+ # with italics/bold.
+ url = url.replace('*', g_escape_table['*']) \
+ .replace('_', g_escape_table['_'])
+ title = self.titles.get(link_id)
+ if title:
+ title = title.replace('*', g_escape_table['*']) \
+ .replace('_', g_escape_table['_'])
+ title_str = ' title="%s"' % title
+ else:
+ title_str = ''
+ if is_img:
+
result = '<img src="%s" alt="%s"%s%s' \
+ % (url.replace('"', '"'),
+ link_text.replace('"', '"'),
+ title_str, self.empty_element_suffix)
+ curr_pos = start_idx + len(result)
+ text = text[:start_idx] + result + text[match.end():]
+ elif start_idx >= anchor_allowed_pos:
+
result = '<a href="%s"%s>%s</a>' \
+ % (url, title_str, link_text)
+
result_head = '<a href="%s"%s>' % (url, title_str)
+ result = '%s%s</a>' % (result_head, link_text)
+
# <img> allowed from curr_pos on, <a> from
+ # anchor_allowed_pos on.
+ curr_pos = start_idx + len(result_head)
+ anchor_allowed_pos = start_idx + len(result)
+ text = text[:start_idx] + result + text[match.end():]
+ else:
+ # Anchor not allowed here.
+ curr_pos = start_idx + 1
+ else:
+ # This id isn't defined, leave the markup alone.
+ curr_pos = match.end()
+ continue
+
+ # Otherwise, it isn't markup.
+ curr_pos = start_idx + 1
+
+ return text
+
+
+ _setext_h_re = re.compile(r'^(.+)[ \t]*\n(=+|-+)[ \t]*\n+', re.M)
+ def _setext_h_sub(self, match):
+ n = {"=": 1, "-": 2}[match.group(2)[0]]
+ demote_headers = self.extras.get("demote-headers")
+ if demote_headers:
+ n = min(n + demote_headers, 6)
+ return "<h%d>%s</h%d>\n\n" \
+ % (n, self._run_span_gamut(match.group(1)), n)
+
+ _atx_h_re = re.compile(r'''
+ ^([\#=]{1,6}) # \1 = string of #'s
+ [ \t]*
+ (.+?) # \2 = Header text
+ [ \t]*
+ (?<!\\) # ensure not an escaped trailing '#'
+ [\#=]* # optional closing #'s (not counted)
+ \n+
+ ''', re.X | re.M)
+ def _atx_h_sub(self, match):
+ n = len(match.group(1))
+ demote_headers = self.extras.get("demote-headers")
+ if demote_headers:
+ n = min(n + demote_headers, 6)
+ return "<h%d>%s</h%d>\n\n" \
+ % (n, self._run_span_gamut(match.group(2)), n)
+
+ def _do_headers(self, text):
+ # Setext-style headers:
+ # Header 1
+ # ========
+ #
+ # Header 2
+ # --------
+ text = self._setext_h_re.sub(self._setext_h_sub, text)
+
+ # atx-style headers:
+ # # Header 1
+ # ## Header 2
+ # ## Header 2 with closing hashes ##
+ # ...
+ # ###### Header 6
+ text = self._atx_h_re.sub(self._atx_h_sub, text)
+
+ return text
+
+
+ _marker_ul_chars = '*+-'
+ _marker_any = r'(?:[%s]|\d+\.)' % _marker_ul_chars
+ _marker_ul = '(?:[%s])' % _marker_ul_chars
+ _marker_ol = r'(?:\d+\.)'
+
+ def _list_sub(self, match):
+ lst = match.group(1)
+ lst_type = match.group(3) in self._marker_ul_chars and "ul" or "ol"
+ result = self._process_list_items(lst)
+ if self.list_level:
+ return "<%s>\n%s</%s>\n" % (lst_type, result, lst_type)
+ else:
+ return "<%s>\n%s</%s>\n\n" % (lst_type, result, lst_type)
+
+ def _do_lists(self, text):
+ # Form HTML ordered (numbered) and unordered (bulleted) lists.
+
+ for marker_pat in (self._marker_ul, self._marker_ol):
+ # Re-usable pattern to match any entire ul or ol list:
+ less_than_tab = self.tab_width - 1
+ whole_list = r'''
+ ( # \1 = whole list
+ ( # \2
+ [ ]{0,%d}
+ (%s) # \3 = first list item marker
+ [ \t]+
+ )
+ (?:.+?)
+ ( # \4
+ \Z
+ |
+ \n{2,}
+ (?=\S)
+ (?! # Negative lookahead for another list item marker
+ [ \t]*
+ %s[ \t]+
+ )
+ )
+ )
+ ''' % (less_than_tab, marker_pat, marker_pat)
+
+ # We use a different prefix before nested lists than top-level lists.
+ # See extended comment in _process_list_items().
+ #
+ # Note: There's a bit of duplication here. My original implementation
+ # created a scalar regex pattern as the conditional result of the test on
+ # $g_list_level, and then only ran the $text =~ s{...}{...}egmx
+ # substitution once, using the scalar as the pattern. This worked,
+ # everywhere except when running under MT on my hosting account at Pair
+ # Networks. There, this caused all rebuilds to be killed by the reaper (or
+ # perhaps they crashed, but that seems incredibly unlikely given that the
+ # same script on the same server ran fine *except* under MT. I've spent
+ # more time trying to figure out why this is happening than I'd like to
+ # admit. My only guess, backed up by the fact that this workaround works,
+ # is that Perl optimizes the substition when it can figure out that the
+ # pattern will never change, and when this optimization isn't on, we run
+ # afoul of the reaper. Thus, the slightly redundant code to that uses two
+ # static s/// patterns rather than one conditional pattern.
+
+ if self.list_level:
+ sub_list_re = re.compile("^"+whole_list, re.X | re.M | re.S)
+ text = sub_list_re.sub(self._list_sub, text)
+ else:
+ list_re = re.compile(r"(?:(?<=\n\n)|\A\n?)"+whole_list,
+ re.X | re.M | re.S)
+ text = list_re.sub(self._list_sub, text)
+
+ return text
+
+ _list_item_re = re.compile(r'''
+ (\n)? # leading line = \1
+ (^[ \t]*) # leading whitespace = \2
+ (?P<marker>%s) [ \t]+ # list marker = \3
+ ((?:.+?) # list item text = \4
+ (\n{1,2})) # eols = \5
+ (?= \n* (\Z | \2 (?P<next_marker>%s) [ \t]+))
+ ''' % (_marker_any, _marker_any),
+ re.M | re.X | re.S)
+
+ _last_li_endswith_two_eols = False
+ def _list_item_sub(self, match):
+ item = match.group(4)
+ leading_line = match.group(1)
+ leading_space = match.group(2)
+ if leading_line or "\n\n" in item or self._last_li_endswith_two_eols:
+ item = self._run_block_gamut(self._outdent(item))
+ else:
+ # Recursion for sub-lists:
+ item = self._do_lists(self._outdent(item))
+ if item.endswith('\n'):
+ item = item[:-1]
+ item = self._run_span_gamut(item)
+ self._last_li_endswith_two_eols = (len(match.group(5)) == 2)
+ return "<li>%s</li>\n" % item
+
+ def _process_list_items(self, list_str):
+ # Process the contents of a single ordered or unordered list,
+ # splitting it into individual list items.
+
+ # The $g_list_level global keeps track of when we're inside a list.
+ # Each time we enter a list, we increment it; when we leave a list,
+ # we decrement. If it's zero, we're not in a list anymore.
+ #
+ # We do this because when we're not inside a list, we want to treat
+ # something like this:
+ #
+ # I recommend upgrading to version
+ # 8. Oops, now this line is treated
+ # as a sub-list.
+ #
+ # As a single paragraph, despite the fact that the second line starts
+ # with a digit-period-space sequence.
+ #
+ # Whereas when we're inside a list (or sub-list), that line will be
+ # treated as the start of a sub-list. What a kludge, huh? This is
+ # an aspect of Markdown's syntax that's hard to parse perfectly
+ # without resorting to mind-reading. Perhaps the solution is to
+ # change the syntax rules such that sub-lists must start with a
+ # starting cardinal number; e.g. "1." or "a.".
+ self.list_level += 1
+ self._last_li_endswith_two_eols = False
+ list_str = list_str.rstrip('\n') + '\n'
+ list_str = self._list_item_re.sub(self._list_item_sub, list_str)
+ self.list_level -= 1
+ return list_str
+
+ def _get_pygments_lexer(self, lexer_name):
+ try:
+ from pygments import lexers, util
+ except ImportError:
+ return None
+ try:
+ return lexers.get_lexer_by_name(lexer_name)
+ except util.ClassNotFound:
+ return None
+
+ def _color_with_pygments(self, codeblock, lexer, **formatter_opts):
+ import pygments
+ import pygments.formatters
+
+ class HtmlCodeFormatter(pygments.formatters.HtmlFormatter):
+ def _wrap_code(self, inner):
+ """A function for use in a Pygments Formatter which
+ wraps in <code> tags.
+ """
+ yield 0, "<code>"
+ for tup in inner:
+ yield tup
+ yield 0, "</code>"
+
+ def wrap(self, source, outfile):
+ """Return the source with a code, pre, and div."""
+ return self._wrap_div(self._wrap_pre(self._wrap_code(source)))
+
+ formatter = HtmlCodeFormatter(cssclass="codehilite", **formatter_opts)
+ return pygments.highlight(codeblock, lexer, formatter)
+
+ def _code_block_sub(self, match):
+ codeblock = match.group(1)
+ codeblock = self._outdent(codeblock)
+ codeblock = self._detab(codeblock)
+ codeblock = codeblock.lstrip('\n') # trim leading newlines
+ codeblock = codeblock.rstrip() # trim trailing whitespace
+
+ if "code-color" in self.extras and codeblock.startswith(":::"):
+ lexer_name, rest = codeblock.split('\n', 1)
+ lexer_name = lexer_name[3:].strip()
+ lexer = self._get_pygments_lexer(lexer_name)
+ codeblock = rest.lstrip("\n") # Remove lexer declaration line.
+ if lexer:
+ formatter_opts = self.extras['code-color'] or {}
+ colored = self._color_with_pygments(codeblock, lexer,
+ **formatter_opts)
+ return "\n\n%s\n\n" % colored
+
+ codeblock = self._encode_code(codeblock)
+
return "\n\n<pre><code>%s\n</code></pre>\n\n" % codeblock
+
+ def _do_code_blocks(self, text):
+
"""Process Markdown `<pre><code>` blocks."""
+ code_block_re = re.compile(r'''
+ (?:\n\n|\A)
+ ( # $1 = the code block -- one or more lines, starting with a space/tab
+ (?:
+ (?:[ ]{%d} | \t) # Lines must start with a tab or a tab-width of spaces
+ .*\n+
+ )+
+ )
+ ((?=^[ ]{0,%d}\S)|\Z) # Lookahead for non-space at line-start, or end of doc
+ ''' % (self.tab_width, self.tab_width),
+ re.M | re.X)
+
+ return code_block_re.sub(self._code_block_sub, text)
+
+
+ # Rules for a code span:
+ # - backslash escapes are not interpreted in a code span
+ # - to include one or or a run of more backticks the delimiters must
+ # be a longer run of backticks
+ # - cannot start or end a code span with a backtick; pad with a
+ # space and that space will be removed in the emitted HTML
+ # See `test/tm-cases/escapes.text` for a number of edge-case
+ # examples.
+ _code_span_re = re.compile(r'''
+ (?<!\\)
+ (`+) # \1 = Opening run of `
+ (?!`) # See Note A test/tm-cases/escapes.text
+ (.+?) # \2 = The code block
+ (?<!`)
+ \1 # Matching closer
+ (?!`)
+ ''', re.X | re.S)
+
+ def _code_span_sub(self, match):
+ c = match.group(2).strip(" \t")
+ c = self._encode_code(c)
+ return "<code>%s</code>" % c
+
+ def _do_code_spans(self, text):
+ # * Backtick quotes are used for <code></code> spans.
+ #
+ # * You can use multiple backticks as the delimiters if you want to
+ # include literal backticks in the code span. So, this input:
+ #
+ # Just type ``foo `bar` baz`` at the prompt.
+ #
+ # Will translate to:
+ #
+
# <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
+ #
+ # There's no arbitrary limit to the number of backticks you
+ # can use as delimters. If you need three consecutive backticks
+ # in your code, use four for delimiters, etc.
+ #
+ # * You can use spaces to get literal backticks at the edges:
+ #
+ # ... type `` `bar` `` ...
+ #
+ # Turns to:
+ #
+ # ... type <code>`bar`</code> ...
+ return self._code_span_re.sub(self._code_span_sub, text)
+
+ def _encode_code(self, text):
+ """Encode/escape certain characters inside Markdown code runs.
+ The point is that in code, these characters are literals,
+ and lose their special Markdown meanings.
+ """
+ replacements = [
+ # Encode all ampersands; HTML entities are not
+ # entities within a Markdown code span.
+ ('&', '&'),
+ # Do the angle bracket song and dance:
+ ('<', '<'),
+ ('>', '>'),
+ # Now, escape characters that are magic in Markdown:
+ ('*', g_escape_table['*']),
+ ('_', g_escape_table['_']),
+ ('{', g_escape_table['{']),
+ ('}', g_escape_table['}']),
+ ('[', g_escape_table['[']),
+ (']', g_escape_table[']']),
+ ('\\', g_escape_table['\\']),
+ ]
+ for before, after in replacements:
+ text = text.replace(before, after)
+ return text
+
+ _strong_re = re.compile(r"(\*\*|__)(?=\S)(.+?[*_]*)(?<=\S)\1", re.S)
+ _em_re = re.compile(r"(\*|_)(?=\S)(.+?)(?<=\S)\1", re.S)
+ _code_friendly_strong_re = re.compile(r"\*\*(?=\S)(.+?[*_]*)(?<=\S)\*\*", re.S)
+ _code_friendly_em_re = re.compile(r"\*(?=\S)(.+?)(?<=\S)\*", re.S)
+ def _do_italics_and_bold(self, text):
+ # <strong> must go first:
+ if "code-friendly" in self.extras:
+ text = self._code_friendly_strong_re.sub(r"<strong>\1</strong>", text)
+ text = self._code_friendly_em_re.sub(r"<em>\1</em>", text)
+ else:
+ text = self._strong_re.sub(r"<strong>\2</strong>", text)
+ text = self._em_re.sub(r"<em>\2</em>", text)
+ return text
+
+
+ _block_quote_re = re.compile(r'''
+ ( # Wrap whole match in \1
+ (
+ ^[ \t]*>[ \t]? # '>' at the start of a line
+ .+\n # rest of the first line
+ (.+\n)* # subsequent consecutive lines
+ \n* # blanks
+ )+
+ )
+ ''', re.M | re.X)
+ _bq_one_level_re = re.compile('^[ \t]*>[ \t]?', re.M);
+
+
_html_pre_block_re = re.compile(r'(\s*<pre>.+?</pre>)', re.S)
+ def _dedent_two_spaces_sub(self, match):
+ return re.sub(r'(?m)^ ', '', match.group(1))
+
+ def _block_quote_sub(self, match):
+ bq = match.group(1)
+ bq = self._bq_one_level_re.sub('', bq) # trim one level of quoting
+ bq = self._ws_only_line_re.sub('', bq) # trim whitespace-only lines
+ bq = self._run_block_gamut(bq) # recurse
+
+ bq = re.sub('(?m)^', ' ', bq)
+
# These leading spaces screw with <pre> content, so we need to fix that:
+ bq = self._html_pre_block_re.sub(self._dedent_two_spaces_sub, bq)
+
+
return "<blockquote>\n%s\n</blockquote>\n\n" % bq
+
+ def _do_block_quotes(self, text):
+ if '>' not in text:
+ return text
+ return self._block_quote_re.sub(self._block_quote_sub, text)
+
+ def _form_paragraphs(self, text):
+ # Strip leading and trailing lines:
+ text = text.strip('\n')
+
+ grafs = []
+ for i, graf in enumerate(re.split(r"\n{2,}", text)):
+ if graf in self.html_blocks:
+ # Unhashify HTML blocks
+ grafs.append(self.html_blocks[graf])
+ else:
+ cuddled_list = None
+ if "cuddled-lists" in self.extras:
+ # Need to put back trailing '\n' for `_list_item_re`
+ # match at the end of the paragraph.
+ li = self._list_item_re.search(graf + '\n')
+ # Two of the same list marker in this paragraph: a likely
+ # candidate for a list cuddled to preceding paragraph
+ # text (issue 33). Note the `[-1]` is a quick way to
+ # consider numeric bullets (e.g. "1." and "2.") to be
+ # equal.
+ if (li and li.group("next_marker")
+ and li.group("marker")[-1] == li.group("next_marker")[-1]):
+ start = li.start()
+ cuddled_list = self._do_lists(graf[start:]).rstrip("\n")
+
assert cuddled_list.startswith("<ul>") or cuddled_list.startswith("<ol>")
+ graf = graf[:start]
+
+ graf = self._run_span_gamut(graf)
+
grafs.append("<p>" + graf.lstrip(" \t") + "</p>")
+
+ if cuddled_list:
+ grafs.append(cuddled_list)
+
+ return "\n\n".join(grafs)
+
+ def _add_footnotes(self, text):
+ if self.footnotes:
+ footer = [
+
'<div class="footnotes">',
+ '<hr' + self.empty_element_suffix,
+ ]
+ for i, id in enumerate(self.footnote_ids):
+ if i != 0:
+ footer.append('')
+ footer.append('<li id="fn-%s">' % id)
+ footer.append(self._run_block_gamut(self.footnotes[id]))
+
backlink = ('<a href="#fnref-%s" '
+ 'class="footnoteBackLink" '
+ 'title="Jump back to footnote %d in the text.">'
+ '↩</a>' % (id, i+1))
+ if footer[-1].endswith("</p>"):
+ footer[-1] = footer[-1][:-len("</p>")] \
+ + ' ' + backlink + "</p>"
+ else:
+
footer.append("\n<p>%s</p>" % backlink)
+ footer.append('</li>')
+ footer.append('</ol>')
+ footer.append('</div>')
+ return text + '\n\n' + '\n'.join(footer)
+ else:
+ return text
+
+ # Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
+ # http://bumppo.net/projects/amputator/
+ _ampersand_re = re.compile(r'&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)')
+ _naked_lt_re = re.compile(r'<(?![a-z/?\$!])', re.I)
+ _naked_gt_re = re.compile(r'''(?<![a-z?!/'"-])>''', re.I)
+
+ def _encode_amps_and_angles(self, text):
+ # Smart processing for ampersands and angle brackets that need
+ # to be encoded.
+ text = self._ampersand_re.sub('&', text)
+
+ # Encode naked <'s
+ text = self._naked_lt_re.sub('<', text)
+
+ # Encode naked >'s
+ # Note: Other markdown implementations (e.g. Markdown.pl, PHP
+ # Markdown) don't do this.
+ text = self._naked_gt_re.sub('>', text)
+ return text
+
+ def _encode_backslash_escapes(self, text):
+ for ch, escape in g_escape_table.items():
+ text = text.replace("\\"+ch, escape)
+ return text
+
+ _auto_link_re = re.compile(r'<((https?|ftp):[^\'">\s]+)>', re.I)
+ def _auto_link_sub(self, match):
+ g1 = match.group(1)
+
return '<a href="%s">%s</a>' % (g1, g1)
+
+ _auto_email_link_re = re.compile(r"""
+ <
+ (?:mailto:)?
+ (
+ [-.\w]+
+ \@
+ [-\w]+(\.[-\w]+)*\.[a-z]+
+ )
+ >
+ """, re.I | re.X | re.U)
+ def _auto_email_link_sub(self, match):
+ return self._encode_email_address(
+ self._unescape_special_chars(match.group(1)))
+
+ def _do_auto_links(self, text):
+ text = self._auto_link_re.sub(self._auto_link_sub, text)
+ text = self._auto_email_link_re.sub(self._auto_email_link_sub, text)
+ return text
+
+ def _encode_email_address(self, addr):
+ # Input: an email address, e.g. "foo@example.com"
+ #
+ # Output: the email address as a mailto link, with each character
+ # of the address encoded as either a decimal or hex entity, in
+ # the hopes of foiling most address harvesting spam bots. E.g.:
+ #
+
# <a href="mailto:foo@e
+ # xample.com">foo
+ # @example.com</a>
+ #
+ # Based on a filter by Matthew Wickline, posted to the BBEdit-Talk
+ # mailing list: <http://tinyurl.com/yu7ue>
+ chars = [_xml_encode_email_char_at_random(ch)
+ for ch in "mailto:" + addr]
+ # Strip the mailto: from the visible part.
+
addr = '<a href="%s">%s</a>' \
+ % (''.join(chars), ''.join(chars[7:]))
+ return addr
+
+ def _do_link_patterns(self, text):
+ """Caveat emptor: there isn't much guarding against link
+ patterns being formed inside other standard Markdown links, e.g.
+ inside a [link def][like this].
+
+ Dev Notes: *Could* consider prefixing regexes with a negative
+ lookbehind assertion to attempt to guard against this.
+ """
+ link_from_hash = {}
+ for regex, repl in self.link_patterns:
+ replacements = []
+ for match in regex.finditer(text):
+ if hasattr(repl, "__call__"):
+ href = repl(match)
+ else:
+ href = match.expand(repl)
+ replacements.append((match.span(), href))
+ for (start, end), href in reversed(replacements):
+ escaped_href = (
+ href.replace('"', '"') # b/c of attr quote
+ # To avoid markdown <em> and <strong>:
+ .replace('*', g_escape_table['*'])
+ .replace('_', g_escape_table['_']))
+
link = '<a href="%s">%s</a>' % (escaped_href, text[start:end])
+ hash = _hash_text(link)
+ link_from_hash[hash] = link
+ text = text[:start] + hash + text[end:]
+ for hash, link in link_from_hash.items():
+ text = text.replace(hash, link)
+ return text
+
+ def _unescape_special_chars(self, text):
+ # Swap back in all the special characters we've hidden.
+ for ch, hash in g_escape_table.items():
+ text = text.replace(hash, ch)
+ return text
+
+ def _outdent(self, text):
+ # Remove one level of line-leading tabs or spaces
+ return self._outdent_re.sub('', text)
projects / webber.git / commitdiff