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""" |
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POST-PROCESSORS |
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============================================================================= |
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Markdown also allows post-processors, which are similar to preprocessors in |
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that they need to implement a "run" method. However, they are run after core |
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processing. |
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""" |
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from __future__ import absolute_import |
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from __future__ import unicode_literals |
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from collections import OrderedDict |
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from . import util |
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from . import odict |
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import re |
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def build_postprocessors(md_instance, **kwargs): |
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""" Build the default postprocessors for Markdown. """ |
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postprocessors = odict.OrderedDict() |
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postprocessors["raw_html"] = RawHtmlPostprocessor(md_instance) |
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postprocessors["amp_substitute"] = AndSubstitutePostprocessor() |
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postprocessors["unescape"] = UnescapePostprocessor() |
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return postprocessors |
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class Postprocessor(util.Processor): |
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""" |
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Postprocessors are run after the ElementTree it converted back into text. |
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Each Postprocessor implements a "run" method that takes a pointer to a |
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text string, modifies it as necessary and returns a text string. |
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Postprocessors must extend markdown.Postprocessor. |
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""" |
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def run(self, text): |
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""" |
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Subclasses of Postprocessor should implement a `run` method, which |
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takes the html document as a single text string and returns a |
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(possibly modified) string. |
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""" |
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pass # pragma: no cover |
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class RawHtmlPostprocessor(Postprocessor): |
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""" Restore raw html to the document. """ |
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def run(self, text): |
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""" Iterate over html stash and restore "safe" html. """ |
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replacements = OrderedDict() |
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for i in range(self.markdown.htmlStash.html_counter): |
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html, safe = self.markdown.htmlStash.rawHtmlBlocks[i] |
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if self.markdown.safeMode and not safe: |
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if str(self.markdown.safeMode).lower() == 'escape': |
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html = self.escape(html) |
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elif str(self.markdown.safeMode).lower() == 'remove': |
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html = '' |
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else: |
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html = self.markdown.html_replacement_text |
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if (self.isblocklevel(html) and |
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(safe or not self.markdown.safeMode)): |
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replacements["<p>%s</p>" % |
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(self.markdown.htmlStash.get_placeholder(i))] = \ |
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html + "\n" |
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replacements[self.markdown.htmlStash.get_placeholder(i)] = html |
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if replacements: |
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pattern = re.compile("|".join(re.escape(k) for k in replacements)) |
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text = pattern.sub(lambda m: replacements[m.group(0)], text) |
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return text |
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def escape(self, html): |
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""" Basic html escaping """ |
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html = html.replace('&', '&') |
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html = html.replace('<', '<') |
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html = html.replace('>', '>') |
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return html.replace('"', '"') |
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def isblocklevel(self, html): |
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m = re.match(r'^\<\/?([^ >]+)', html) |
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if m: |
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if m.group(1)[0] in ('!', '?', '@', '%'): |
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# Comment, php etc... |
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return True |
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return util.isBlockLevel(m.group(1)) |
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return False |
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class AndSubstitutePostprocessor(Postprocessor): |
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""" Restore valid entities """ |
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def run(self, text): |
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text = text.replace(util.AMP_SUBSTITUTE, "&") |
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return text |
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class UnescapePostprocessor(Postprocessor): |
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""" Restore escaped chars """ |
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RE = re.compile(r'%s(\d+)%s' % (util.STX, util.ETX)) |
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def unescape(self, m): |
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return util.int2str(int(m.group(1))) |
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def run(self, text): |
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return self.RE.sub(self.unescape, text) |
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MikeCoder /
markdown-preview.vim
