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-"""
-Legacy Extension for Python-Markdown
-====================================
-
-Replaces the core parser with the old one.
-
-"""
-
-import markdown, re
-from markdown import etree
-
-"""Basic and reusable regular expressions."""
-
-def wrapRe(raw_re) : return re.compile("^%s$" % raw_re, re.DOTALL)
-CORE_RE = {
- 'header': wrapRe(r'(#{1,6})[ \t]*(.*?)[ \t]*(#*)'), # # A title
- 'reference-def': wrapRe(r'(\ ?\ ?\ ?)\[([^\]]*)\]:\s*([^ ]*)(.*)'),
- # [Google]: http://www.google.com/
- 'containsline': wrapRe(r'([-]*)$|^([=]*)'), # -----, =====, etc.
- 'ol': wrapRe(r'[ ]{0,3}[\d]*\.\s+(.*)'), # 1. text
- 'ul': wrapRe(r'[ ]{0,3}[*+-]\s+(.*)'), # "* text"
- 'isline1': wrapRe(r'(\**)'), # ***
- 'isline2': wrapRe(r'(\-*)'), # ---
- 'isline3': wrapRe(r'(\_*)'), # ___
- 'tabbed': wrapRe(r'((\t)|( ))(.*)'), # an indented line
- 'quoted': wrapRe(r'[ ]{0,2}> ?(.*)'), # a quoted block ("> ...")
- 'containsline': re.compile(r'^([-]*)$|^([=]*)$', re.M),
- 'attr': re.compile("\{@([^\}]*)=([^\}]*)}") # {@id=123}
-}
-
-class MarkdownParser:
- """Parser Markdown into a ElementTree."""
-
- def __init__(self):
- pass
-
- def parseDocument(self, lines):
- """Parse a markdown string into an ElementTree."""
- # Create a ElementTree from the lines
- root = etree.Element("div")
- buffer = []
- for line in lines:
- if line.startswith("#"):
- self.parseChunk(root, buffer)
- buffer = [line]
- else:
- buffer.append(line)
-
- self.parseChunk(root, buffer)
-
- return etree.ElementTree(root)
-
- def parseChunk(self, parent_elem, lines, inList=0, looseList=0):
- """Process a chunk of markdown-formatted text and attach the parse to
- an ElementTree node.
-
- 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.
-
- Keyword arguments:
-
- * parent_elem: The ElementTree element to which the content will be
- added.
- * lines: a list of lines
- * inList: a level
-
- Returns: None
-
- """
- # Loop through lines until none left.
- while lines:
- # Skipping empty line
- if not lines[0]:
- lines = lines[1:]
- continue
-
- # Check if this section starts with a list, a blockquote or
- # a code block. If so, process them.
- processFn = { 'ul': self.__processUList,
- 'ol': self.__processOList,
- 'quoted': self.__processQuote,
- 'tabbed': self.__processCodeBlock}
- for regexp in ['ul', 'ol', 'quoted', 'tabbed']:
- m = CORE_RE[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:
- CORE_RE['ul'].match(line)
- or CORE_RE['ol'].match(line)
- or not line.strip()))
- self.parseChunk(parent_elem, start, inList-1,
- looseList=looseList)
- inList = inList-1
-
- else: # Ok, so it's just a simple block
- test = lambda line: not line.strip() or line[0] == '>'
- paragraph, lines = self.__linesUntil(lines, test)
- if len(paragraph) and paragraph[0].startswith('#'):
- self.__processHeader(parent_elem, paragraph)
- elif len(paragraph) and CORE_RE["isline3"].match(paragraph[0]):
- self.__processHR(parent_elem)
- lines = paragraph[1:] + lines
- 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 __processHR(self, parentElem):
- hr = etree.SubElement(parentElem, "hr")
-
- def __processHeader(self, parentElem, paragraph):
- m = CORE_RE['header'].match(paragraph[0])
- if m:
- level = len(m.group(1))
- h = etree.SubElement(parentElem, "h%d" % level)
- h.text = m.group(2).strip()
- else:
- message(CRITICAL, "We've got a problem header!")
-
- def __processParagraph(self, parentElem, paragraph, inList, looseList):
-
- if ( parentElem.tag == 'li'
- and not (looseList or parentElem.getchildren())):
-
- # If this is the first paragraph inside "li", don't
- # put <p> around it - append the paragraph bits directly
- # onto parentElem
- el = parentElem
- else:
- # Otherwise make a "p" element
- el = etree.SubElement(parentElem, "p")
-
- dump = []
-
- # Searching for hr or header
- for line in paragraph:
- # it's hr
- if CORE_RE["isline3"].match(line):
- el.text = "\n".join(dump)
- self.__processHR(el)
- dump = []
- # it's header
- elif line.startswith("#"):
- el.text = "\n".join(dump)
- self.__processHeader(parentElem, [line])
- dump = []
- else:
- dump.append(line)
- if dump:
- text = "\n".join(dump)
- el.text = text
-
- def __processUList(self, parentElem, lines, inList):
- self.__processList(parentElem, lines, inList, listexpr='ul', tag='ul')
-
- def __processOList(self, parentElem, lines, inList):
- self.__processList(parentElem, lines, inList, listexpr='ol', tag='ol')
-
- def __processList(self, parentElem, 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.
-
- Keyword arguments:
-
- * parentElem: A ElementTree element to which the content will be added
- * lines: a list of lines
- * inList: a level
-
- Returns: None
-
- """
- ul = etree.SubElement(parentElem, tag) # ul might actually be '<ol>'
-
- 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 ( CORE_RE[listexpr].match(next) or
- CORE_RE['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 = CORE_RE[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 ElementTree elements
- for item in items:
- li = etree.SubElement(ul, "li")
- self.parseChunk(li, item, inList + 1, looseList = looseList)
-
- # Process the remaining part of the section
- self.parseChunk(parentElem, 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, parentElem, 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.
-
- Keyword arguments:
-
- * parentElem: ElementTree element to which the content will be added
- * lines: a list of lines
- * inList: a level
-
- Returns: None
-
- """
- dequoted = []
- i = 0
- blank_line = False # allow one blank line between paragraphs
- for line in lines:
- m = CORE_RE['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 = etree.SubElement(parentElem, "blockquote")
-
- self.parseChunk(blockquote, dequoted, inList)
- self.parseChunk(parentElem, lines[i:], inList)
-
- def __processCodeBlock(self, parentElem, lines, inList):
- """
- Given a list of document lines starting with a code block
- finds the end of the block, puts it into the ElementTree verbatim
- wrapped in ("<pre><code>") and recursively processes the
- the remainder of the text file.
-
- Keyword arguments:
-
- * parentElem: ElementTree element to which the content will be added
- * lines: a list of lines
- * inList: a level
-
- Returns: None
-
- """
- detabbed, theRest = self.detectTabbed(lines)
- pre = etree.SubElement(parentElem, "pre")
- code = etree.SubElement(pre, "code")
- text = "\n".join(detabbed).rstrip()+"\n"
- code.text = markdown.AtomicString(text)
- self.parseChunk(parentElem, theRest, inList)
-
- def detectTabbed(self, lines):
- """ Find indented text and remove indent before further proccesing.
-
- Keyword arguments:
-
- * lines: an array of strings
-
- Returns: a list of post processed items and the unused
- remainder of the original list
-
- """
- items = []
- item = -1
- i = 0 # to keep track of where we are
-
- def detab(line):
- match = CORE_RE['tabbed'].match(line)
- if match:
- return match.group(4)
-
- for line in lines:
- if line.strip(): # Non-blank line
- line = detab(line)
- if line:
- items.append(line)
- i += 1
- continue
- else:
- return items, lines[i:]
-
- else: # Blank line: _maybe_ we are done.
- i += 1 # advance
-
- # Find the next non-blank line
- for j in range(i, len(lines)):
- if lines[j].strip():
- next_line = lines[j]; break
- else:
- break # There is no more text; we are done.
-
- # Check if the next non-blank line is tabbed
- if detab(next_line): # Yes, more work to do.
- items.append("")
- continue
- else:
- break # No, we are done.
- else:
- i += 1
-
- return items, lines[i:]
-
-class HeaderPreprocessor(markdown.Preprocessor):
-
- """Replace underlined headers with hashed headers.
-
- (To avoid the need 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
-
-
-class LinePreprocessor(markdown.Preprocessor):
- """Convert HR lines to "___" format."""
- 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 + "___"
- return lines
-
- def _isLine(self, block):
- """Determine if a block should be replaced with an <HR>"""
- if block.startswith(" "):
- return False # a code block
- text = "".join([x for x in block if not x.isspace()])
- if len(text) <= 2:
- return False
- for pattern in ['isline1', 'isline2', 'isline3']:
- m = CORE_RE[pattern].match(text)
- if (m and m.group(1)):
- return True
- else:
- return False
-
-
-class LegacyExtension(markdown.Extension):
- """ Replace Markdown's core parser. """
-
- def extendMarkdown(self, md, md_globals):
- """ Set the core parser to an instance of MarkdownParser. """
- md.parser = MarkdownParser()
- md.preprocessors.add ("header", HeaderPreprocessor(self), "<reference")
- md.preprocessors.add("line", LinePreprocessor(self), "<reference")
-
-
-def makeExtension(configs={}):
- return LegacyExtension(configs=configs)
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 23:07:17 +0000