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#!/usr/bin/env python
version = "1.7"
version_info = (1,7,0,"rc-2")
__revision__ = "$Rev: 72 $"
"""
Python-Markdown
===============
Converts Markdown to HTML. Basic usage as a module:
import markdown
md = Markdown()
html = md.convert(your_text_string)
See http://www.freewisdom.org/projects/python-markdown/ for more
information and instructions on how to extend the functionality of the
script. (You might want to read that before you try modifying this
file.)
Started by [Manfred Stienstra](http://www.dwerg.net/). Continued and
maintained by [Yuri Takhteyev](http://www.freewisdom.org) and [Waylan
Limberg](http://achinghead.com/).
Contact: yuri [at] freewisdom.org
waylan [at] gmail.com
License: GPL 2 (http://www.gnu.org/copyleft/gpl.html) or BSD
"""
import re, sys, codecs
from logging import getLogger, StreamHandler, Formatter, \
DEBUG, INFO, WARN, ERROR, CRITICAL
MESSAGE_THRESHOLD = CRITICAL
# Configure debug message logger (the hard way - to support python 2.3)
logger = getLogger('MARKDOWN')
logger.setLevel(DEBUG) # This is restricted by handlers later
console_hndlr = StreamHandler()
formatter = Formatter('%(name)s-%(levelname)s: "%(message)s"')
console_hndlr.setFormatter(formatter)
console_hndlr.setLevel(MESSAGE_THRESHOLD)
logger.addHandler(console_hndlr)
def message(level, text):
''' A wrapper method for logging debug messages. '''
logger.log(level, text)
# --------------- CONSTANTS YOU MIGHT WANT TO MODIFY -----------------
TAB_LENGTH = 4 # expand tabs to this many spaces
ENABLE_ATTRIBUTES = True # @id = xyz -> <... id="xyz">
SMART_EMPHASIS = 1 # this_or_that does not become this<i>or</i>that
HTML_REMOVED_TEXT = "[HTML_REMOVED]" # text used instead of HTML in safe mode
RTL_BIDI_RANGES = ( (u'\u0590', u'\u07FF'),
# from Hebrew to Nko (includes Arabic, Syriac and Thaana)
(u'\u2D30', u'\u2D7F'),
# Tifinagh
)
# Unicode Reference Table:
# 0590-05FF - Hebrew
# 0600-06FF - Arabic
# 0700-074F - Syriac
# 0750-077F - Arabic Supplement
# 0780-07BF - Thaana
# 07C0-07FF - Nko
BOMS = { 'utf-8': (codecs.BOM_UTF8, ),
'utf-16': (codecs.BOM_UTF16_LE, codecs.BOM_UTF16_BE),
#'utf-32': (codecs.BOM_UTF32_LE, codecs.BOM_UTF32_BE)
}
def removeBOM(text, encoding):
convert = isinstance(text, unicode)
for bom in BOMS[encoding]:
bom = convert and bom.decode(encoding) or bom
if text.startswith(bom):
return text.lstrip(bom)
return text
# The following constant specifies the name used in the usage
# statement displayed for python versions lower than 2.3. (With
# python2.3 and higher the usage statement is generated by optparse
# and uses the actual name of the executable called.)
EXECUTABLE_NAME_FOR_USAGE = "python markdown.py"
# --------------- CONSTANTS YOU _SHOULD NOT_ HAVE TO CHANGE ----------
# a template for html placeholders
HTML_PLACEHOLDER_PREFIX = "qaodmasdkwaspemas"
HTML_PLACEHOLDER = HTML_PLACEHOLDER_PREFIX + "%dajkqlsmdqpakldnzsdfls"
BLOCK_LEVEL_ELEMENTS = ['p', 'div', 'blockquote', 'pre', 'table',
'dl', 'ol', 'ul', 'script', 'noscript',
'form', 'fieldset', 'iframe', 'math', 'ins',
'del', 'hr', 'hr/', 'style']
def isBlockLevel (tag):
return ( (tag in BLOCK_LEVEL_ELEMENTS) or
(tag[0] == 'h' and tag[1] in "0123456789") )
"""
======================================================================
========================== NANODOM ===================================
======================================================================
The three classes below implement some of the most basic DOM
methods. I use this instead of minidom because I need a simpler
functionality and do not want to require additional libraries.
Importantly, NanoDom does not do normalization, which is what we
want. It also adds extra white space when converting DOM to string
"""
ENTITY_NORMALIZATION_EXPRESSIONS = [ (re.compile("&"), "&amp;"),
(re.compile("<"), "&lt;"),
(re.compile(">"), "&gt;")]
ENTITY_NORMALIZATION_EXPRESSIONS_SOFT = [ (re.compile("&(?!\#)"), "&amp;"),
(re.compile("<"), "&lt;"),
(re.compile(">"), "&gt;"),
(re.compile("\""), "&quot;")]
def getBidiType(text):
if not text: return None
ch = text[0]
if not isinstance(ch, unicode) or not ch.isalpha():
return None
else:
for min, max in RTL_BIDI_RANGES:
if ( ch >= min and ch <= max ):
return "rtl"
else:
return "ltr"
class Document:
def __init__ (self):
self.bidi = "ltr"
def appendChild(self, child):
self.documentElement = child
child.isDocumentElement = True
child.parent = self
self.entities = {}
def setBidi(self, bidi):
if bidi:
self.bidi = bidi
def createElement(self, tag, textNode=None):
el = Element(tag)
el.doc = self
if textNode:
el.appendChild(self.createTextNode(textNode))
return el
def createTextNode(self, text):
node = TextNode(text)
node.doc = self
return node
def createEntityReference(self, entity):
if entity not in self.entities:
self.entities[entity] = EntityReference(entity)
return self.entities[entity]
def createCDATA(self, text):
node = CDATA(text)
node.doc = self
return node
def toxml (self):
return self.documentElement.toxml()
def normalizeEntities(self, text, avoidDoubleNormalizing=False):
if avoidDoubleNormalizing:
regexps = ENTITY_NORMALIZATION_EXPRESSIONS_SOFT
else:
regexps = ENTITY_NORMALIZATION_EXPRESSIONS
for regexp, substitution in regexps:
text = regexp.sub(substitution, text)
return text
def find(self, test):
return self.documentElement.find(test)
def unlink(self):
self.documentElement.unlink()
self.documentElement = None
class CDATA:
type = "cdata"
def __init__ (self, text):
self.text = text
def handleAttributes(self):
pass
def toxml (self):
return "<![CDATA[" + self.text + "]]>"
class Element:
type = "element"
def __init__ (self, tag):
self.nodeName = tag
self.attributes = []
self.attribute_values = {}
self.childNodes = []
self.bidi = None
self.isDocumentElement = False
def setBidi(self, bidi):
if bidi:
orig_bidi = self.bidi
if not self.bidi or self.isDocumentElement:
# Once the bidi is set don't change it (except for doc element)
self.bidi = bidi
self.parent.setBidi(bidi)
def unlink(self):
for child in self.childNodes:
if child.type == "element":
child.unlink()
self.childNodes = None
def setAttribute(self, attr, value):
if not attr in self.attributes:
self.attributes.append(attr)
self.attribute_values[attr] = value
def insertChild(self, position, child):
self.childNodes.insert(position, child)
child.parent = self
def removeChild(self, child):
self.childNodes.remove(child)
def replaceChild(self, oldChild, newChild):
position = self.childNodes.index(oldChild)
self.removeChild(oldChild)
self.insertChild(position, newChild)
def appendChild(self, child):
self.childNodes.append(child)
child.parent = self
def handleAttributes(self):
pass
def find(self, test, depth=0):
""" Returns a list of descendants that pass the test function """
matched_nodes = []
for child in self.childNodes:
if test(child):
matched_nodes.append(child)
if child.type == "element":
matched_nodes += child.find(test, depth+1)
return matched_nodes
def toxml(self):
if ENABLE_ATTRIBUTES:
for child in self.childNodes:
child.handleAttributes()
buffer = ""
if self.nodeName in ['h1', 'h2', 'h3', 'h4']:
buffer += "\n"
elif self.nodeName in ['li']:
buffer += "\n "
# Process children FIRST, then do the attributes
childBuffer = ""
if self.childNodes or self.nodeName in ['blockquote']:
childBuffer += ">"
for child in self.childNodes:
childBuffer += child.toxml()
if self.nodeName == 'p':
childBuffer += "\n"
elif self.nodeName == 'li':
childBuffer += "\n "
childBuffer += "</%s>" % self.nodeName
else:
childBuffer += "/>"
buffer += "<" + self.nodeName
if self.nodeName in ['p', 'li', 'ul', 'ol',
'h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
if not self.attribute_values.has_key("dir"):
if self.bidi:
bidi = self.bidi
else:
bidi = self.doc.bidi
if bidi=="rtl":
self.setAttribute("dir", "rtl")
for attr in self.attributes:
value = self.attribute_values[attr]
value = self.doc.normalizeEntities(value,
avoidDoubleNormalizing=True)
buffer += ' %s="%s"' % (attr, value)
# Now let's actually append the children
buffer += childBuffer
if self.nodeName in ['p', 'br ', 'li', 'ul', 'ol',
'h1', 'h2', 'h3', 'h4'] :
buffer += "\n"
return buffer
class TextNode:
type = "text"
attrRegExp = re.compile(r'\{@([^\}]*)=([^\}]*)}') # {@id=123}
def __init__ (self, text):
self.value = text
def attributeCallback(self, match):
self.parent.setAttribute(match.group(1), match.group(2))
def handleAttributes(self):
self.value = self.attrRegExp.sub(self.attributeCallback, self.value)
def toxml(self):
text = self.value
self.parent.setBidi(getBidiType(text))
if not text.startswith(HTML_PLACEHOLDER_PREFIX):
if self.parent.nodeName == "p":
text = text.replace("\n", "\n ")
elif (self.parent.nodeName == "li"
and self.parent.childNodes[0]==self):
text = "\n " + text.replace("\n", "\n ")
text = self.doc.normalizeEntities(text)
return text
class EntityReference:
type = "entity_ref"
def __init__(self, entity):
self.entity = entity
def handleAttributes(self):
pass
def toxml(self):
return "&" + self.entity + ";"
"""
======================================================================
========================== PRE-PROCESSORS ============================
======================================================================
Preprocessors munge source text before we start doing anything too
complicated.
There are two types of preprocessors: TextPreprocessor and Preprocessor.
"""
class TextPreprocessor:
'''
TextPreprocessors are run before the text is broken into lines.
Each TextPreprocessor implements a "run" method that takes a pointer to a
text string of the document, modifies it as necessary and returns
either the same pointer or a pointer to a new string.
TextPreprocessors must extend markdown.TextPreprocessor.
'''
def run(self, text):
pass
class Preprocessor:
'''
Preprocessors are run after the text is broken into lines.
Each preprocessor implements a "run" method that takes a pointer to a
list of lines of the document, modifies it as necessary and returns
either the same pointer or a pointer to a new list.
Preprocessors must extend markdown.Preprocessor.
'''
def run(self, lines):
pass
class HtmlBlockPreprocessor(TextPreprocessor):
"""Removes html blocks from the source text and stores it."""
def _get_left_tag(self, block):
return block[1:].replace(">", " ", 1).split()[0].lower()
def _get_right_tag(self, left_tag, block):
return block.rstrip()[-len(left_tag)-2:-1].lower()
def _equal_tags(self, left_tag, right_tag):
if left_tag == 'div' or left_tag[0] in ['?', '@', '%']: # handle PHP, etc.
return True
if ("/" + left_tag) == right_tag:
return True
if (right_tag == "--" and left_tag == "--"):
return True
elif left_tag == right_tag[1:] \
and right_tag[0] != "<":
return True
else:
return False
def _is_oneliner(self, tag):
return (tag in ['hr', 'hr/'])
def run(self, text):
new_blocks = []
text = text.split("\n\n")
items = []
left_tag = ''
right_tag = ''
in_tag = False # flag
for block in text:
if block.startswith("\n"):
block = block[1:]
if not in_tag:
if block.startswith("<"):
left_tag = self._get_left_tag(block)
right_tag = self._get_right_tag(left_tag, block)
if not (isBlockLevel(left_tag) \
or block[1] in ["!", "?", "@", "%"]):
new_blocks.append(block)
continue
if self._is_oneliner(left_tag):
new_blocks.append(block.strip())
continue
if block[1] == "!":
# is a comment block
left_tag = "--"
right_tag = self._get_right_tag(left_tag, block)
# keep checking conditions below and maybe just append
if block.rstrip().endswith(">") \
and self._equal_tags(left_tag, right_tag):
new_blocks.append(
self.stash.store(block.strip()))
continue
else: #if not block[1] == "!":
# if is block level tag and is not complete
items.append(block.strip())
in_tag = True
continue
new_blocks.append(block)
else:
items.append(block.strip())
right_tag = self._get_right_tag(left_tag, block)
if self._equal_tags(left_tag, right_tag):
# if find closing tag
in_tag = False
new_blocks.append(
self.stash.store('\n\n'.join(items)))
items = []
if items:
new_blocks.append(self.stash.store('\n\n'.join(items)))
new_blocks.append('\n')
return "\n\n".join(new_blocks)
HTML_BLOCK_PREPROCESSOR = HtmlBlockPreprocessor()
class HeaderPreprocessor(Preprocessor):
"""
Replaces underlined headers with hashed headers to avoid
the nead for lookahead later.
"""
def run (self, lines):
i = -1
while i+1 < len(lines):
i = i+1
if not lines[i].strip():
continue
if lines[i].startswith("#"):
lines.insert(i+1, "\n")
if (i+1 <= len(lines)
and lines[i+1]
and lines[i+1][0] in ['-', '=']):
underline = lines[i+1].strip()
if underline == "="*len(underline):
lines[i] = "# " + lines[i].strip()
lines[i+1] = ""
elif underline == "-"*len(underline):
lines[i] = "## " + lines[i].strip()
lines[i+1] = ""
return lines
HEADER_PREPROCESSOR = HeaderPreprocessor()
class LinePreprocessor(Preprocessor):
"""Deals with HR lines (needs to be done before processing lists)"""
blockquote_re = re.compile(r'^(> )+')
def run (self, lines):
for i in range(len(lines)):
prefix = ''
m = self.blockquote_re.search(lines[i])
if m : prefix = m.group(0)
if self._isLine(lines[i][len(prefix):]):
lines[i] = prefix + self.stash.store("<hr />", safe=True)
return lines
def _isLine(self, block):
"""Determines if a block should be replaced with an <HR>"""
if block.startswith(" "): return 0 # a code block
text = "".join([x for x in block if not x.isspace()])
if len(text) <= 2:
return 0
for pattern in ['isline1', 'isline2', 'isline3']:
m = RE.regExp[pattern].match(text)
if (m and m.group(1)):
return 1
else:
return 0
LINE_PREPROCESSOR = LinePreprocessor()
class ReferencePreprocessor(Preprocessor):
'''
Removes reference definitions from the text and stores them for later use.
'''
def run (self, lines):
new_text = [];
for line in lines:
m = RE.regExp['reference-def'].match(line)
if m:
id = m.group(2).strip().lower()
t = m.group(4).strip() # potential title
if not t:
self.references[id] = (m.group(3), t)
elif (len(t) >= 2
and (t[0] == t[-1] == "\""
or t[0] == t[-1] == "\'"
or (t[0] == "(" and t[-1] == ")") ) ):
self.references[id] = (m.group(3), t[1:-1])
else:
new_text.append(line)
else:
new_text.append(line)
return new_text #+ "\n"
REFERENCE_PREPROCESSOR = ReferencePreprocessor()
"""
======================================================================
========================== INLINE PATTERNS ===========================
======================================================================
Inline patterns such as *emphasis* are handled by means of auxiliary
objects, one per pattern. Pattern objects must be instances of classes
that extend markdown.Pattern. Each pattern object uses a single regular
expression and needs support the following methods:
pattern.getCompiledRegExp() - returns a regular expression
pattern.handleMatch(m, doc) - takes a match object and returns
a NanoDom node (as a part of the provided
doc) or None
All of python markdown's built-in patterns subclass from Patter,
but you can add additional patterns that don't.
Also note that all the regular expressions used by inline must
capture the whole block. For this reason, they all start with
'^(.*)' and end with '(.*)!'. In case with built-in expression
Pattern takes care of adding the "^(.*)" and "(.*)!".
Finally, the order in which regular expressions are applied is very
important - e.g. if we first replace http://.../ links with <a> tags
and _then_ try to replace inline html, we would end up with a mess.
So, we apply the expressions in the following order:
* escape and backticks have to go before everything else, so
that we can preempt any markdown patterns by escaping them.
* then we handle auto-links (must be done before inline html)
* then we handle inline HTML. At this point we will simply
replace all inline HTML strings with a placeholder and add
the actual HTML to a hash.
* then inline images (must be done before links)
* then bracketed links, first regular then reference-style
* finally we apply strong and emphasis
"""
NOBRACKET = r'[^\]\[]*'
BRK = ( r'\[('
+ (NOBRACKET + r'(\[')*6
+ (NOBRACKET+ r'\])*')*6
+ NOBRACKET + r')\]' )
NOIMG = r'(?<!\!)'
BACKTICK_RE = r'\`([^\`]*)\`' # `e= m*c^2`
DOUBLE_BACKTICK_RE = r'\`\`(.*)\`\`' # ``e=f("`")``
ESCAPE_RE = r'\\(.)' # \<
EMPHASIS_RE = r'\*([^\*]*)\*' # *emphasis*
STRONG_RE = r'\*\*(.*)\*\*' # **strong**
STRONG_EM_RE = r'\*\*\*([^_]*)\*\*\*' # ***strong***
if SMART_EMPHASIS:
EMPHASIS_2_RE = r'(?<!\S)_(\S[^_]*)_' # _emphasis_
else:
EMPHASIS_2_RE = r'_([^_]*)_' # _emphasis_
STRONG_2_RE = r'__([^_]*)__' # __strong__
STRONG_EM_2_RE = r'___([^_]*)___' # ___strong___
LINK_RE = NOIMG + BRK + r'\s*\(([^\)]*)\)' # [text](url)
LINK_ANGLED_RE = NOIMG + BRK + r'\s*\(<([^\)]*)>\)' # [text](<url>)
IMAGE_LINK_RE = r'\!' + BRK + r'\s*\(([^\)]*)\)' # ![alttxt](http://x.com/)
REFERENCE_RE = NOIMG + BRK+ r'\s*\[([^\]]*)\]' # [Google][3]
IMAGE_REFERENCE_RE = r'\!' + BRK + '\s*\[([^\]]*)\]' # ![alt text][2]
NOT_STRONG_RE = r'( \* )' # stand-alone * or _
AUTOLINK_RE = r'<(http://[^>]*)>' # <http://www.123.com>
AUTOMAIL_RE = r'<([^> \!]*@[^> ]*)>' # <me@example.com>
#HTML_RE = r'(\<[^\>]*\>)' # <...>
HTML_RE = r'(\<[a-zA-Z/][^\>]*\>)' # <...>
ENTITY_RE = r'(&[\#a-zA-Z0-9]*;)' # &amp;
LINE_BREAK_RE = r' \n' # two spaces at end of line
LINE_BREAK_2_RE = r' $' # two spaces at end of text
class Pattern:
def __init__ (self, pattern):
self.pattern = pattern
self.compiled_re = re.compile("^(.*)%s(.*)$" % pattern, re.DOTALL)
def getCompiledRegExp (self):
return self.compiled_re
BasePattern = Pattern # for backward compatibility
class SimpleTextPattern (Pattern):
def handleMatch(self, m, doc):
return doc.createTextNode(m.group(2))
class SimpleTagPattern (Pattern):
def __init__ (self, pattern, tag):
Pattern.__init__(self, pattern)
self.tag = tag
def handleMatch(self, m, doc):
el = doc.createElement(self.tag)
el.appendChild(doc.createTextNode(m.group(2)))
return el
class SubstituteTagPattern (SimpleTagPattern):
def handleMatch (self, m, doc):
return doc.createElement(self.tag)
class BacktickPattern (Pattern):
def __init__ (self, pattern):
Pattern.__init__(self, pattern)
self.tag = "code"
def handleMatch(self, m, doc):
el = doc.createElement(self.tag)
text = m.group(2).strip()
#text = text.replace("&", "&amp;")
el.appendChild(doc.createTextNode(text))
return el
class DoubleTagPattern (SimpleTagPattern):
def handleMatch(self, m, doc):
tag1, tag2 = self.tag.split(",")
el1 = doc.createElement(tag1)
el2 = doc.createElement(tag2)
el1.appendChild(el2)
el2.appendChild(doc.createTextNode(m.group(2)))
return el1
class HtmlPattern (Pattern):
def handleMatch (self, m, doc):
rawhtml = m.group(2)
inline = True
place_holder = self.stash.store(rawhtml)
return doc.createTextNode(place_holder)
class LinkPattern (Pattern):
def handleMatch(self, m, doc):
el = doc.createElement('a')
el.appendChild(doc.createTextNode(m.group(2)))
parts = m.group(9).split('"')
# We should now have [], [href], or [href, title]
if parts:
el.setAttribute('href', parts[0].strip())
else:
el.setAttribute('href', "")
if len(parts) > 1:
# we also got a title
title = '"' + '"'.join(parts[1:]).strip()
title = dequote(title) #.replace('"', "&quot;")
el.setAttribute('title', title)
return el
class ImagePattern (Pattern):
def handleMatch(self, m, doc):
el = doc.createElement('img')
src_parts = m.group(9).split()
if src_parts:
el.setAttribute('src', src_parts[0])
else:
el.setAttribute('src', "")
if len(src_parts) > 1:
el.setAttribute('title', dequote(" ".join(src_parts[1:])))
if ENABLE_ATTRIBUTES:
text = doc.createTextNode(m.group(2))
el.appendChild(text)
text.handleAttributes()
truealt = text.value
el.childNodes.remove(text)
else:
truealt = m.group(2)
el.setAttribute('alt', truealt)
return el
class ReferencePattern (Pattern):
def handleMatch(self, m, doc):
if m.group(9):
id = m.group(9).lower()
else:
# if we got something like "[Google][]"
# we'll use "google" as the id
id = m.group(2).lower()
if not self.references.has_key(id): # ignore undefined refs
return None
href, title = self.references[id]
text = m.group(2)
return self.makeTag(href, title, text, doc)
def makeTag(self, href, title, text, doc):
el = doc.createElement('a')
el.setAttribute('href', href)
if title:
el.setAttribute('title', title)
el.appendChild(doc.createTextNode(text))
return el
class ImageReferencePattern (ReferencePattern):
def makeTag(self, href, title, text, doc):
el = doc.createElement('img')
el.setAttribute('src', href)
if title:
el.setAttribute('title', title)
el.setAttribute('alt', text)
return el
class AutolinkPattern (Pattern):
def handleMatch(self, m, doc):
el = doc.createElement('a')
el.setAttribute('href', m.group(2))
el.appendChild(doc.createTextNode(m.group(2)))
return el
class AutomailPattern (Pattern):
def handleMatch(self, m, doc):
el = doc.createElement('a')
email = m.group(2)
if email.startswith("mailto:"):
email = email[len("mailto:"):]
for letter in email:
entity = doc.createEntityReference("#%d" % ord(letter))
el.appendChild(entity)
mailto = "mailto:" + email
mailto = "".join(['&#%d;' % ord(letter) for letter in mailto])
el.setAttribute('href', mailto)
return el
ESCAPE_PATTERN = SimpleTextPattern(ESCAPE_RE)
NOT_STRONG_PATTERN = SimpleTextPattern(NOT_STRONG_RE)
BACKTICK_PATTERN = BacktickPattern(BACKTICK_RE)
DOUBLE_BACKTICK_PATTERN = BacktickPattern(DOUBLE_BACKTICK_RE)
STRONG_PATTERN = SimpleTagPattern(STRONG_RE, 'strong')
STRONG_PATTERN_2 = SimpleTagPattern(STRONG_2_RE, 'strong')
EMPHASIS_PATTERN = SimpleTagPattern(EMPHASIS_RE, 'em')
EMPHASIS_PATTERN_2 = SimpleTagPattern(EMPHASIS_2_RE, 'em')
STRONG_EM_PATTERN = DoubleTagPattern(STRONG_EM_RE, 'strong,em')
STRONG_EM_PATTERN_2 = DoubleTagPattern(STRONG_EM_2_RE, 'strong,em')
LINE_BREAK_PATTERN = SubstituteTagPattern(LINE_BREAK_RE, 'br ')
LINE_BREAK_PATTERN_2 = SubstituteTagPattern(LINE_BREAK_2_RE, 'br ')
LINK_PATTERN = LinkPattern(LINK_RE)
LINK_ANGLED_PATTERN = LinkPattern(LINK_ANGLED_RE)
IMAGE_LINK_PATTERN = ImagePattern(IMAGE_LINK_RE)
IMAGE_REFERENCE_PATTERN = ImageReferencePattern(IMAGE_REFERENCE_RE)
REFERENCE_PATTERN = ReferencePattern(REFERENCE_RE)
HTML_PATTERN = HtmlPattern(HTML_RE)
ENTITY_PATTERN = HtmlPattern(ENTITY_RE)
AUTOLINK_PATTERN = AutolinkPattern(AUTOLINK_RE)
AUTOMAIL_PATTERN = AutomailPattern(AUTOMAIL_RE)
"""
======================================================================
========================== POST-PROCESSORS ===========================
======================================================================
Markdown also allows post-processors, which are similar to
preprocessors in that they need to implement a "run" method. However,
they are run after core processing.
There are two types of post-processors: Postprocessor and TextPostprocessor
"""
class Postprocessor:
'''
Postprocessors are run before the dom it converted back into text.
Each Postprocessor implements a "run" method that takes a pointer to a
NanoDom document, modifies it as necessary and returns a NanoDom
document.
Postprocessors must extend markdown.Postprocessor.
There are currently no standard post-processors, but the footnote
extension uses one.
'''
def run(self, dom):
pass
class TextPostprocessor:
'''
TextPostprocessors are run after the dom it converted back into text.
Each TextPostprocessor implements a "run" method that takes a pointer to a
text string, modifies it as necessary and returns a text string.
TextPostprocessors must extend markdown.TextPostprocessor.
'''
def run(self, text):
pass
class RawHtmlTextPostprocessor(TextPostprocessor):
def __init__(self):
pass
def run(self, text):
for i in range(self.stash.html_counter):
html, safe = self.stash.rawHtmlBlocks[i]
if self.safeMode and not safe:
if str(self.safeMode).lower() == 'escape':
html = self.escape(html)
elif str(self.safeMode).lower() == 'remove':
html = ''
else:
html = HTML_REMOVED_TEXT
text = text.replace("<p>%s\n</p>" % (HTML_PLACEHOLDER % i),
html + "\n")
text = text.replace(HTML_PLACEHOLDER % i, html)
return text
def escape(self, html):
''' Basic html escaping '''
html = html.replace('&', '&amp;')
html = html.replace('<', '&lt;')
html = html.replace('>', '&gt;')
return html.replace('"', '&quot;')
RAWHTMLTEXTPOSTPROCESSOR = RawHtmlTextPostprocessor()
"""
======================================================================
========================== MISC AUXILIARY CLASSES ====================
======================================================================
"""
class HtmlStash:
"""This class is used for stashing HTML objects that we extract
in the beginning and replace with place-holders."""
def __init__ (self):
self.html_counter = 0 # for counting inline html segments
self.rawHtmlBlocks=[]
def store(self, html, safe=False):
"""Saves an HTML segment for later reinsertion. Returns a
placeholder string that needs to be inserted into the
document.
@param html: an html segment
@param safe: label an html segment as safe for safemode
@param inline: label a segmant as inline html
@returns : a placeholder string """
self.rawHtmlBlocks.append((html, safe))
placeholder = HTML_PLACEHOLDER % self.html_counter
self.html_counter += 1
return placeholder
class BlockGuru:
def _findHead(self, lines, fn, allowBlank=0):
"""Functional magic to help determine boundaries of indented
blocks.
@param lines: an array of strings
@param fn: a function that returns a substring of a string
if the string matches the necessary criteria
@param allowBlank: specifies whether it's ok to have blank
lines between matching functions
@returns: a list of post processes items and the unused
remainder of the original list"""
items = []
item = -1
i = 0 # to keep track of where we are
for line in lines:
if not line.strip() and not allowBlank:
return items, lines[i:]
if not line.strip() and allowBlank:
# If we see a blank line, this _might_ be the end
i += 1
# Find the next non-blank line
for j in range(i, len(lines)):
if lines[j].strip():
next = lines[j]
break
else:
# There is no more text => this is the end
break
# Check if the next non-blank line is still a part of the list
part = fn(next)
if part:
items.append("")
continue
else:
break # found end of the list
part = fn(line)
if part:
items.append(part)
i += 1
continue
else:
return items, lines[i:]
else:
i += 1
return items, lines[i:]
def detabbed_fn(self, line):
""" An auxiliary method to be passed to _findHead """
m = RE.regExp['tabbed'].match(line)
if m:
return m.group(4)
else:
return None
def detectTabbed(self, lines):
return self._findHead(lines, self.detabbed_fn,
allowBlank = 1)
def print_error(string):
"""Print an error string to stderr"""
sys.stderr.write(string +'\n')
def dequote(string):
""" Removes quotes from around a string """
if ( ( string.startswith('"') and string.endswith('"'))
or (string.startswith("'") and string.endswith("'")) ):
return string[1:-1]
else:
return string
"""
======================================================================
========================== CORE MARKDOWN =============================
======================================================================
This stuff is ugly, so if you are thinking of extending the syntax,
see first if you can do it via pre-processors, post-processors,
inline patterns or a combination of the three.
"""
class CorePatterns:
"""This class is scheduled for removal as part of a refactoring
effort."""
patterns = {
'header': r'(#*)([^#]*)(#*)', # # A title
'reference-def': r'(\ ?\ ?\ ?)\[([^\]]*)\]:\s*([^ ]*)(.*)',
# [Google]: http://www.google.com/
'containsline': r'([-]*)$|^([=]*)', # -----, =====, etc.
'ol': r'[ ]{0,3}[\d]*\.\s+(.*)', # 1. text
'ul': r'[ ]{0,3}[*+-]\s+(.*)', # "* text"
'isline1': r'(\**)', # ***
'isline2': r'(\-*)', # ---
'isline3': r'(\_*)', # ___
'tabbed': r'((\t)|( ))(.*)', # an indented line
'quoted': r'> ?(.*)', # a quoted block ("> ...")
}
def __init__ (self):
self.regExp = {}
for key in self.patterns.keys():
self.regExp[key] = re.compile("^%s$" % self.patterns[key],
re.DOTALL)
self.regExp['containsline'] = re.compile(r'^([-]*)$|^([=]*)$', re.M)
RE = CorePatterns()
class Markdown:
""" Markdown formatter class for creating an html document from
Markdown text """
def __init__(self, source=None, # depreciated
extensions=[],
extension_configs=None,
safe_mode = False):
"""Creates a new Markdown instance.
@param source: The text in Markdown format. Depreciated!
@param extensions: A list if extensions.
@param extension-configs: Configuration setting for extensions.
@param safe_mode: Disallow raw html. """
self.source = source
if source is not None:
message(WARN, "The `source` arg of Markdown.__init__() is depreciated and will be removed in the future. Use `instance.convert(source)` instead.")
self.safeMode = safe_mode
self.blockGuru = BlockGuru()
self.registeredExtensions = []
self.stripTopLevelTags = 1
self.docType = ""
self.textPreprocessors = [HTML_BLOCK_PREPROCESSOR]
self.preprocessors = [HEADER_PREPROCESSOR,
LINE_PREPROCESSOR,
# A footnote preprocessor will
# get inserted here
REFERENCE_PREPROCESSOR]
self.postprocessors = [] # a footnote postprocessor will get
# inserted later
self.textPostprocessors = [# a footnote postprocessor will get
# inserted here
RAWHTMLTEXTPOSTPROCESSOR]
self.prePatterns = []
self.inlinePatterns = [DOUBLE_BACKTICK_PATTERN,
BACKTICK_PATTERN,
ESCAPE_PATTERN,
REFERENCE_PATTERN,
LINK_ANGLED_PATTERN,
LINK_PATTERN,
IMAGE_LINK_PATTERN,
IMAGE_REFERENCE_PATTERN,
AUTOLINK_PATTERN,
AUTOMAIL_PATTERN,
LINE_BREAK_PATTERN_2,
LINE_BREAK_PATTERN,
HTML_PATTERN,
ENTITY_PATTERN,
NOT_STRONG_PATTERN,
STRONG_EM_PATTERN,
STRONG_EM_PATTERN_2,
STRONG_PATTERN,
STRONG_PATTERN_2,
EMPHASIS_PATTERN,
EMPHASIS_PATTERN_2
# The order of the handlers matters!!!
]
self.registerExtensions(extensions = extensions,
configs = extension_configs)
self.reset()
def registerExtensions(self, extensions, configs):
if not configs:
configs = {}
for ext in extensions:
extension_module_name = "mdx_" + ext
try:
module = __import__(extension_module_name)
except:
message(CRITICAL,
"couldn't load extension %s (looking for %s module)"
% (ext, extension_module_name) )
else:
if configs.has_key(ext):
configs_for_ext = configs[ext]
else:
configs_for_ext = []
extension = module.makeExtension(configs_for_ext)
extension.extendMarkdown(self, globals())
def registerExtension(self, extension):
""" This gets called by the extension """
self.registeredExtensions.append(extension)
def reset(self):
"""Resets all state variables so that we can start
with a new text."""
self.references={}
self.htmlStash = HtmlStash()
HTML_BLOCK_PREPROCESSOR.stash = self.htmlStash
LINE_PREPROCESSOR.stash = self.htmlStash
REFERENCE_PREPROCESSOR.references = self.references
HTML_PATTERN.stash = self.htmlStash
ENTITY_PATTERN.stash = self.htmlStash
REFERENCE_PATTERN.references = self.references
IMAGE_REFERENCE_PATTERN.references = self.references
RAWHTMLTEXTPOSTPROCESSOR.stash = self.htmlStash
RAWHTMLTEXTPOSTPROCESSOR.safeMode = self.safeMode
for extension in self.registeredExtensions:
extension.reset()
def _transform(self):
"""Transforms the Markdown text into a XHTML body document
@returns: A NanoDom Document """
# Setup the document
self.doc = Document()
self.top_element = self.doc.createElement("span")
self.top_element.appendChild(self.doc.createTextNode('\n'))
self.top_element.setAttribute('class', 'markdown')
self.doc.appendChild(self.top_element)
# Fixup the source text
text = self.source
text = text.replace("\r\n", "\n").replace("\r", "\n")
text += "\n\n"
text = text.expandtabs(TAB_LENGTH)
# Split into lines and run the preprocessors that will work with
# self.lines
self.lines = text.split("\n")
# Run the pre-processors on the lines
for prep in self.preprocessors :
self.lines = prep.run(self.lines)
# Create a NanoDom tree from the lines and attach it to Document
buffer = []
for line in self.lines:
if line.startswith("#"):
self._processSection(self.top_element, buffer)
buffer = [line]
else:
buffer.append(line)
self._processSection(self.top_element, buffer)
#self._processSection(self.top_element, self.lines)
# Not sure why I put this in but let's leave it for now.
self.top_element.appendChild(self.doc.createTextNode('\n'))
# Run the post-processors
for postprocessor in self.postprocessors:
postprocessor.run(self.doc)
return self.doc
def _processSection(self, parent_elem, lines,
inList = 0, looseList = 0):
"""Process a section of a source document, looking for high
level structural elements like lists, block quotes, code
segments, html blocks, etc. Some those then get stripped
of their high level markup (e.g. get unindented) and the
lower-level markup is processed recursively.
@param parent_elem: A NanoDom element to which the content
will be added
@param lines: a list of lines
@param inList: a level
@returns: None"""
# Loop through lines until none left.
while lines:
# Check if this section starts with a list, a blockquote or
# a code block
processFn = { 'ul': self._processUList,
'ol': self._processOList,
'quoted': self._processQuote,
'tabbed': self._processCodeBlock}
for regexp in ['ul', 'ol', 'quoted', 'tabbed']:
m = RE.regExp[regexp].match(lines[0])
if m:
processFn[regexp](parent_elem, lines, inList)
return
# We are NOT looking at one of the high-level structures like
# lists or blockquotes. So, it's just a regular paragraph
# (though perhaps nested inside a list or something else). If
# we are NOT inside a list, we just need to look for a blank
# line to find the end of the block. If we ARE inside a
# list, however, we need to consider that a sublist does not
# need to be separated by a blank line. Rather, the following
# markup is legal:
#
# * The top level list item
#
# Another paragraph of the list. This is where we are now.
# * Underneath we might have a sublist.
#
if inList:
start, lines = self._linesUntil(lines, (lambda line:
RE.regExp['ul'].match(line)
or RE.regExp['ol'].match(line)
or not line.strip()))
self._processSection(parent_elem, start,
inList - 1, looseList = looseList)
inList = inList-1
else: # Ok, so it's just a simple block
paragraph, lines = self._linesUntil(lines, lambda line:
not line.strip())
if len(paragraph) and paragraph[0].startswith('#'):
self._processHeader(parent_elem, paragraph)
elif paragraph:
self._processParagraph(parent_elem, paragraph,
inList, looseList)
if lines and not lines[0].strip():
lines = lines[1:] # skip the first (blank) line
def _processHeader(self, parent_elem, paragraph):
m = RE.regExp['header'].match(paragraph[0])
if m:
level = len(m.group(1))
h = self.doc.createElement("h%d" % level)
parent_elem.appendChild(h)
for item in self._handleInline(m.group(2).strip()):
h.appendChild(item)
else:
message(CRITICAL, "We've got a problem header!")
def _processParagraph(self, parent_elem, paragraph, inList, looseList):
list = self._handleInline("\n".join(paragraph))
if ( parent_elem.nodeName == 'li'
and not (looseList or parent_elem.childNodes)):
# If this is the first paragraph inside "li", don't
# put <p> around it - append the paragraph bits directly
# onto parent_elem
el = parent_elem
else:
# Otherwise make a "p" element
el = self.doc.createElement("p")
parent_elem.appendChild(el)
for item in list:
el.appendChild(item)
def _processUList(self, parent_elem, lines, inList):
self._processList(parent_elem, lines, inList,
listexpr='ul', tag = 'ul')
def _processOList(self, parent_elem, lines, inList):
self._processList(parent_elem, lines, inList,
listexpr='ol', tag = 'ol')
def _processList(self, parent_elem, lines, inList, listexpr, tag):
"""Given a list of document lines starting with a list item,
finds the end of the list, breaks it up, and recursively
processes each list item and the remainder of the text file.
@param parent_elem: A dom element to which the content will be added
@param lines: a list of lines
@param inList: a level
@returns: None"""
ul = self.doc.createElement(tag) # ul might actually be '<ol>'
parent_elem.appendChild(ul)
looseList = 0
# Make a list of list items
items = []
item = -1
i = 0 # a counter to keep track of where we are
for line in lines:
loose = 0
if not line.strip():
# If we see a blank line, this _might_ be the end of the list
i += 1
loose = 1
# Find the next non-blank line
for j in range(i, len(lines)):
if lines[j].strip():
next = lines[j]
break
else:
# There is no more text => end of the list
break
# Check if the next non-blank line is still a part of the list
if ( RE.regExp['ul'].match(next) or
RE.regExp['ol'].match(next) or
RE.regExp['tabbed'].match(next) ):
# get rid of any white space in the line
items[item].append(line.strip())
looseList = loose or looseList
continue
else:
break # found end of the list
# Now we need to detect list items (at the current level)
# while also detabing child elements if necessary
for expr in ['ul', 'ol', 'tabbed']:
m = RE.regExp[expr].match(line)
if m:
if expr in ['ul', 'ol']: # We are looking at a new item
#if m.group(1) :
# Removed the check to allow for a blank line
# at the beginning of the list item
items.append([m.group(1)])
item += 1
elif expr == 'tabbed': # This line needs to be detabbed
items[item].append(m.group(4)) #after the 'tab'
i += 1
break
else:
items[item].append(line) # Just regular continuation
i += 1 # added on 2006.02.25
else:
i += 1
# Add the dom elements
for item in items:
li = self.doc.createElement("li")
ul.appendChild(li)
self._processSection(li, item, inList + 1, looseList = looseList)
# Process the remaining part of the section
self._processSection(parent_elem, lines[i:], inList)
def _linesUntil(self, lines, condition):
""" A utility function to break a list of lines upon the
first line that satisfied a condition. The condition
argument should be a predicate function.
"""
i = -1
for line in lines:
i += 1
if condition(line): break
else:
i += 1
return lines[:i], lines[i:]
def _processQuote(self, parent_elem, lines, inList):
"""Given a list of document lines starting with a quote finds
the end of the quote, unindents it and recursively
processes the body of the quote and the remainder of the
text file.
@param parent_elem: DOM element to which the content will be added
@param lines: a list of lines
@param inList: a level
@returns: None """
dequoted = []
i = 0
blank_line = False # allow one blank line between paragraphs
for line in lines:
m = RE.regExp['quoted'].match(line)
if m:
dequoted.append(m.group(1))
i += 1
blank_line = False
elif not blank_line and line.strip() != '':
dequoted.append(line)
i += 1
elif not blank_line and line.strip() == '':
dequoted.append(line)
i += 1
blank_line = True
else:
break
blockquote = self.doc.createElement('blockquote')
parent_elem.appendChild(blockquote)
self._processSection(blockquote, dequoted, inList)
self._processSection(parent_elem, lines[i:], inList)
def _processCodeBlock(self, parent_elem, lines, inList):
"""Given a list of document lines starting with a code block
finds the end of the block, puts it into the dom verbatim
wrapped in ("<pre><code>") and recursively processes the
the remainder of the text file.
@param parent_elem: DOM element to which the content will be added
@param lines: a list of lines
@param inList: a level
@returns: None"""
detabbed, theRest = self.blockGuru.detectTabbed(lines)
pre = self.doc.createElement('pre')
code = self.doc.createElement('code')
parent_elem.appendChild(pre)
pre.appendChild(code)
text = "\n".join(detabbed).rstrip()+"\n"
#text = text.replace("&", "&amp;")
code.appendChild(self.doc.createTextNode(text))
self._processSection(parent_elem, theRest, inList)
def _handleInline (self, line, patternIndex=0):
"""Transform a Markdown line with inline elements to an XHTML
fragment.
This function uses auxiliary objects called inline patterns.
See notes on inline patterns above.
@param line: A line of Markdown text
@param patternIndex: The index of the inlinePattern to start with
@return: A list of NanoDom nodes """
parts = [line]
while patternIndex < len(self.inlinePatterns):
i = 0
while i < len(parts):
x = parts[i]
if isinstance(x, (str, unicode)):
result = self._applyPattern(x, \
self.inlinePatterns[patternIndex], \
patternIndex)
if result:
i -= 1
parts.remove(x)
for y in result:
parts.insert(i+1,y)
i += 1
patternIndex += 1
for i in range(len(parts)):
x = parts[i]
if isinstance(x, (str, unicode)):
parts[i] = self.doc.createTextNode(x)
return parts
def _applyPattern(self, line, pattern, patternIndex):
""" Given a pattern name, this function checks if the line
fits the pattern, creates the necessary elements, and returns
back a list consisting of NanoDom elements and/or strings.
@param line: the text to be processed
@param pattern: the pattern to be checked
@returns: the appropriate newly created NanoDom element if the
pattern matches, None otherwise.
"""
# match the line to pattern's pre-compiled reg exp.
# if no match, move on.
m = pattern.getCompiledRegExp().match(line)
if not m:
return None
# if we got a match let the pattern make us a NanoDom node
# if it doesn't, move on
node = pattern.handleMatch(m, self.doc)
# check if any of this nodes have children that need processing
if isinstance(node, Element):
if not node.nodeName in ["code", "pre"]:
for child in node.childNodes:
if isinstance(child, TextNode):
result = self._handleInline(child.value, patternIndex+1)
if result:
if result == [child]:
continue
result.reverse()
#to make insertion easier
position = node.childNodes.index(child)
node.removeChild(child)
for item in result:
if isinstance(item, (str, unicode)):
if len(item) > 0:
node.insertChild(position,
self.doc.createTextNode(item))
else:
node.insertChild(position, item)
if node:
# Those are in the reverse order!
return ( m.groups()[-1], # the string to the left
node, # the new node
m.group(1)) # the string to the right of the match
else:
return None
def convert (self, source = None):
"""Return the document in XHTML format.
@returns: A serialized XHTML body."""
if source is not None: #Allow blank string
self.source = source
if not self.source:
return u""
try:
self.source = unicode(self.source)
except UnicodeDecodeError:
message(CRITICAL, 'UnicodeDecodeError: Markdown only accepts unicode or ascii input.')
return u""
for pp in self.textPreprocessors:
self.source = pp.run(self.source)
doc = self._transform()
xml = doc.toxml()
# Return everything but the top level tag
if self.stripTopLevelTags:
xml = xml.strip()[23:-7] + "\n"
for pp in self.textPostprocessors:
xml = pp.run(xml)
return (self.docType + xml).strip()
def __str__(self):
''' Report info about instance. Markdown always returns unicode. '''
if self.source is None:
status = 'in which no source text has been assinged.'
else:
status = 'which contains %d chars and %d line(s) of source.'%\
(len(self.source), self.source.count('\n')+1)
return 'An instance of "%s" %s'% (self.__class__, status)
__unicode__ = convert # markdown should always return a unicode string
# ====================================================================
def markdownFromFile(input = None,
output = None,
extensions = [],
encoding = None,
message_threshold = CRITICAL,
safe = False):
global console_hndlr
console_hndlr.setLevel(message_threshold)
message(DEBUG, "input file: %s" % input)
if not encoding:
encoding = "utf-8"
input_file = codecs.open(input, mode="r", encoding=encoding)
text = input_file.read()
input_file.close()
text = removeBOM(text, encoding)
new_text = markdown(text, extensions, safe_mode = safe)
if output:
output_file = codecs.open(output, "w", encoding=encoding)
output_file.write(new_text)
output_file.close()
else:
sys.stdout.write(new_text.encode(encoding))
def markdown(text,
extensions = [],
safe_mode = False):
message(DEBUG, "in markdown.markdown(), received text:\n%s" % text)
extension_names = []
extension_configs = {}
for ext in extensions:
pos = ext.find("(")
if pos == -1:
extension_names.append(ext)
else:
name = ext[:pos]
extension_names.append(name)
pairs = [x.split("=") for x in ext[pos+1:-1].split(",")]
configs = [(x.strip(), y.strip()) for (x, y) in pairs]
extension_configs[name] = configs
md = Markdown(extensions=extension_names,
extension_configs=extension_configs,
safe_mode = safe_mode)
return md.convert(text)
class Extension:
def __init__(self, configs = {}):
self.config = configs
def getConfig(self, key):
if self.config.has_key(key):
return self.config[key][0]
else:
return ""
def getConfigInfo(self):
return [(key, self.config[key][1]) for key in self.config.keys()]
def setConfig(self, key, value):
self.config[key][0] = value
OPTPARSE_WARNING = """
Python 2.3 or higher required for advanced command line options.
For lower versions of Python use:
%s INPUT_FILE > OUTPUT_FILE
""" % EXECUTABLE_NAME_FOR_USAGE
def parse_options():
try:
optparse = __import__("optparse")
except:
if len(sys.argv) == 2:
return {'input': sys.argv[1],
'output': None,
'message_threshold': CRITICAL,
'safe': False,
'extensions': [],
'encoding': None }
else:
print OPTPARSE_WARNING
return None
parser = optparse.OptionParser(usage="%prog INPUTFILE [options]")
parser.add_option("-f", "--file", dest="filename",
help="write output to OUTPUT_FILE",
metavar="OUTPUT_FILE")
parser.add_option("-e", "--encoding", dest="encoding",
help="encoding for input and output files",)
parser.add_option("-q", "--quiet", default = CRITICAL,
action="store_const", const=60, dest="verbose",
help="suppress all messages")
parser.add_option("-v", "--verbose",
action="store_const", const=INFO, dest="verbose",
help="print info messages")
parser.add_option("-s", "--safe", dest="safe", default=False,
metavar="SAFE_MODE",
help="same mode ('replace', 'remove' or 'escape' user's HTML tag)")
parser.add_option("--noisy",
action="store_const", const=DEBUG, dest="verbose",
help="print debug messages")
parser.add_option("-x", "--extension", action="append", dest="extensions",
help = "load extension EXTENSION", metavar="EXTENSION")
(options, args) = parser.parse_args()
if not len(args) == 1:
parser.print_help()
return None
else:
input_file = args[0]
if not options.extensions:
options.extensions = []
return {'input': input_file,
'output': options.filename,
'message_threshold': options.verbose,
'safe': options.safe,
'extensions': options.extensions,
'encoding': options.encoding }
if __name__ == '__main__':
""" Run Markdown from the command line. """
options = parse_options()
#if os.access(inFile, os.R_OK):
if not options:
sys.exit(0)
markdownFromFile(**options)
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