forked from varia/varia.website
many many many Varia's websites, work in progress: https://many.vvvvvvaria.org
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
136 lines
4.9 KiB
136 lines
4.9 KiB
# -*- coding: utf-8 -*-
|
|
from __future__ import absolute_import
|
|
|
|
import logging
|
|
import re
|
|
|
|
from six.moves.urllib.parse import urlparse, urlunparse
|
|
|
|
from pelican import signals, contents
|
|
|
|
from linker import content_objects
|
|
|
|
logger = logging.getLogger("linker")
|
|
|
|
class Link(object):
|
|
"""Represents an HTML link including a linker command.
|
|
|
|
Typically, the Link is constructed from an SRE_Match after applying the
|
|
provided Link.regex pattern to the HTML content of a content object.
|
|
|
|
"""
|
|
# regex based on the one used in contents.py from pelican version 3.6.3
|
|
regex = re.compile(
|
|
r""" # EXAMPLE: <a rel="nofollow" href="{mailto}webmaster"
|
|
|
|
(?P<markup><\s*[^\>]* # <a rel="nofollow" href= --> markup
|
|
(?:href|src|poster|data|cite|formaction|action)\s*=)
|
|
|
|
(?P<quote>["\']) # " --> quote
|
|
\{(?P<cmd>.*?)\} # {mailto} --> cmd
|
|
(?P<url>.*?) # webmaster --> __url (see path)
|
|
\2 # " <-- quote
|
|
|
|
""", re.X)
|
|
|
|
def __init__(self, context, content_object, match):
|
|
"""Construct a Link from an SRE_Match.
|
|
|
|
:param context: The shared context between generators.
|
|
:param content_object: The associated pelican.contents.Content.
|
|
:param match: An SRE_Match obtained by applying the regex to my content.
|
|
|
|
"""
|
|
self.context = context
|
|
self.content_object = content_object
|
|
|
|
self.markup = match.group('markup')
|
|
self.quote = match.group('quote')
|
|
self.cmd = match.group('cmd')
|
|
self.__url = urlparse(match.group('url'))
|
|
self.path = self.__url.path
|
|
|
|
def href(self): # rebuild matched URL using (possibly updated) self.path
|
|
return urlunparse( self.__url._replace(path=self.path) )
|
|
|
|
def html_code(self): # rebuild matched pattern from (possibly updated) self
|
|
return ''.join((self.markup, self.quote, self.href(), self.quote))
|
|
|
|
|
|
class LinkerBase(object):
|
|
"""Base class for performing the linker command magic.
|
|
|
|
In order to provide the linker command 'foo' as in '<a href="{foo}contact',
|
|
a responsible Linker class (e.g., FooLinker) should derive from LinkerBase
|
|
and set FooLinker.commands to ['foo']. The linker command is processed when
|
|
the overridden Linker.link(Link) is called.
|
|
|
|
"""
|
|
commands = [] # link commands handled by the Linker. EXAMPLE: ['mailto']
|
|
builtins = ['filename', 'attach', 'category', 'tag', 'author', 'index']
|
|
|
|
|
|
def __init__(self, settings):
|
|
self.settings = settings
|
|
|
|
def link(self, link):
|
|
raise NotImplementedError
|
|
|
|
|
|
class Linkers(object):
|
|
"""Interface for all Linkers.
|
|
|
|
This class contains a mapping of {cmd1: linker1, cmd2: linker2} to apply any
|
|
registered linker command by passing the Link to the responsible Linker.
|
|
|
|
(Idea based on pelican.readers.Readers, but with less customization options.)
|
|
|
|
"""
|
|
def __init__(self, settings):
|
|
self.settings = settings
|
|
self.linkers = {}
|
|
|
|
for linker_class in [LinkerBase] + LinkerBase.__subclasses__():
|
|
for cmd in linker_class.commands:
|
|
self.register_linker(cmd, linker_class)
|
|
|
|
def register_linker(self, cmd, linker_class):
|
|
if cmd in self.linkers: # check for existing registration of that cmd
|
|
current_linker_class = self.linkers[cmd].__class__
|
|
logger.warning(
|
|
"%s is stealing the linker command %s from %s.",
|
|
linker_class.__name__, cmd, current_linker_class.__name__
|
|
)
|
|
self.linkers[cmd] = linker_class(self.settings)
|
|
|
|
def handle_links_in_content_object(self, context, content_object):
|
|
# replace Link matches (with side effects on content and content_object)
|
|
def replace_link_match(match):
|
|
link = Link(context, content_object, match)
|
|
|
|
if link.cmd in LinkerBase.builtins:
|
|
pass # builtin commands not handled here
|
|
elif link.cmd in self.linkers:
|
|
self.linkers[link.cmd].link(link) # let Linker process the Link
|
|
else:
|
|
logger.warning("Ignoring unknown linker command %s", link.cmd)
|
|
|
|
return link.html_code() # return HTML to replace the matched link
|
|
|
|
content_object._content = Link.regex.sub( # match, process and replace
|
|
replace_link_match, content_object._content)
|
|
|
|
|
|
def feed_context_to_linkers(generators):
|
|
settings = generators[0].settings
|
|
linkers = Linkers(settings)
|
|
|
|
context = generators[0].context
|
|
for co in context['content_objects']: # provided by plugin 'content_objects'
|
|
if isinstance(co, contents.Static): continue
|
|
if not co._content: continue
|
|
linkers.handle_links_in_content_object(context, co)
|
|
|
|
def register():
|
|
content_objects.register()
|
|
signals.all_generators_finalized.connect(feed_context_to_linkers)
|
|
|