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# -*- coding: utf-8 -*-
"""
Python Markdown
A Python implementation of John Gruber's Markdown.
Documentation: https://python-markdown.github.io/
GitHub: https://github.com/Python-Markdown/markdown/
PyPI: https://pypi.org/project/Markdown/
Started by Manfred Stienstra (http://www.dwerg.net/).
Maintained for a few years by Yuri Takhteyev (http://www.freewisdom.org).
Currently maintained by Waylan Limberg (https://github.com/waylan),
Dmitry Shachnev (https://github.com/mitya57) and Isaac Muse (https://github.com/facelessuser).
Copyright 2007-2018 The Python Markdown Project (v. 1.7 and later)
Copyright 2004, 2005, 2006 Yuri Takhteyev (v. 0.2-1.6b)
Copyright 2004 Manfred Stienstra (the original version)
License: BSD (see LICENSE.md for details).
PRE-PROCESSORS
=============================================================================
Preprocessors work on source text before we start doing anything too
complicated.
"""
from __future__ import absolute_import
from __future__ import unicode_literals
from . import util
import re
def build_preprocessors(md, **kwargs):
""" Build the default set of preprocessors used by Markdown. """
preprocessors = util.Registry()
preprocessors.register(NormalizeWhitespace(md), 'normalize_whitespace', 30)
preprocessors.register(ReferencePreprocessor(md), 'reference', 10)
return preprocessors
class Preprocessor(util.Processor):
"""
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):
"""
Each subclass of Preprocessor should override the `run` method, which
takes the document as a list of strings split by newlines and returns
the (possibly modified) list of lines.
"""
pass # pragma: no cover
class NormalizeWhitespace(Preprocessor):
""" Normalize whitespace for consistent parsing. """
def run(self, lines):
source = '\n'.join(lines)
source = source.replace(util.STX, "").replace(util.ETX, "")
source = source.replace("\r\n", "\n").replace("\r", "\n") + "\n\n"
source = source.expandtabs(self.md.tab_length)
source = re.sub(r'(?<=\n) +\n', '\n', source)
return source.split('\n')
class ReferencePreprocessor(Preprocessor):
""" Remove reference definitions from text and store for later use. """
TITLE = r'[ ]*(\"(.*)\"|\'(.*)\'|\((.*)\))[ ]*'
RE = re.compile(
r'^[ ]{0,3}\[([^\]]*)\]:\s*([^ ]*)[ ]*(%s)?$' % TITLE, re.DOTALL
)
TITLE_RE = re.compile(r'^%s$' % TITLE)
def run(self, lines):
new_text = []
while lines:
line = lines.pop(0)
m = self.RE.match(line)
if m:
id = m.group(1).strip().lower()
link = m.group(2).lstrip('<').rstrip('>')
t = m.group(5) or m.group(6) or m.group(7)
if not t:
# Check next line for title
tm = self.TITLE_RE.match(lines[0])
if tm:
lines.pop(0)
t = tm.group(2) or tm.group(3) or tm.group(4)
self.md.references[id] = (link, t)
# Preserve the line to prevent raw HTML indexing issue.
# https://github.com/Python-Markdown/markdown/issues/584
new_text.append('')
else:
new_text.append(line)
return new_text # + "\n"
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