Add a bbcode tag to render tag link

boards/mdx_neboard.py

@@ -1,218 +1,230 b''
 # coding=utf-8
 
 import re
 import bbcode
 
 from urllib.parse import unquote
 
 from django.core.exceptions import ObjectDoesNotExist
 from django.core.urlresolvers import reverse
 
 import boards
 
 
 __author__ = 'neko259'
 
 
 REFLINK_PATTERN = re.compile(r'^\d+$')
 MULTI_NEWLINES_PATTERN = re.compile(r'(\r?\n){2,}')
 ONE_NEWLINE = '\n'
 REGEX_URL = re.compile(r'https?\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(/\S*)?')
 LINE_BREAK_HTML = '<div class="br"></div>'
 
 
 class TextFormatter():
     """
     An interface for formatter that can be used in the text format panel
     """
 
     def __init__(self):
         pass
 
     name = ''
 
     # Left and right tags for the button preview
     preview_left = ''
     preview_right = ''
 
     # Left and right characters for the textarea input
     format_left = ''
     format_right = ''
 
 
 class AutolinkPattern():
     def handleMatch(self, m):
         link_element = etree.Element('a')
         href = m.group(2)
         link_element.set('href', href)
         link_element.text = href
 
         return link_element
 
 
 class QuotePattern(TextFormatter):
     name = '>q'
     preview_left = '<span class="quote">'
     preview_right = '</span>'
 
     format_left = '[quote]'
     format_right = '[/quote]'
 
 
 class SpoilerPattern(TextFormatter):
     name = 'spoiler'
     preview_left = '<span class="spoiler">'
     preview_right = '</span>'
 
     format_left = '[spoiler]'
     format_right = '[/spoiler]'
 
     def handleMatch(self, m):
         quote_element = etree.Element('span')
         quote_element.set('class', 'spoiler')
         quote_element.text = m.group(2)
 
         return quote_element
 
 
 class CommentPattern(TextFormatter):
     name = ''
     preview_left = '<span class="comment">// '
     preview_right = '</span>'
 
     format_left = '[comment]'
     format_right = '[/comment]'
 
 
 # TODO Use <s> tag here
 class StrikeThroughPattern(TextFormatter):
     name = 's'
     preview_left = '<span class="strikethrough">'
     preview_right = '</span>'
 
     format_left = '[s]'
     format_right = '[/s]'
 
 
 class ItalicPattern(TextFormatter):
     name = 'i'
     preview_left = '<i>'
     preview_right = '</i>'
 
     format_left = '[i]'
     format_right = '[/i]'
 
 
 class BoldPattern(TextFormatter):
     name = 'b'
     preview_left = '<b>'
     preview_right = '</b>'
 
     format_left = '[b]'
     format_right = '[/b]'
 
 
 class CodePattern(TextFormatter):
     name = 'code'
     preview_left = '<code>'
     preview_right = '</code>'
 
     format_left = '[code]'
     format_right = '[/code]'
 
 
 def render_reflink(tag_name, value, options, parent, context):
     result = '>>%s' % value
 
     if REFLINK_PATTERN.match(value):
         post_id = int(value)
 
         try:
             post = boards.models.Post.objects.get(id=post_id)
 
             result = '<a href="%s">&gt;&gt;%s</a>' % (post.get_absolute_url(), post_id)
         except ObjectDoesNotExist:
             pass
 
     return result
 
 
 def render_quote(tag_name, value, options, parent, context):
     source = ''
     if 'source' in options:
         source = options['source']
 
     if source:
         result = '<div class="multiquote"><div class="quote-header">%s</div><div class="quote-text">%s</div></div>' % (source, value)
     else:
         # Insert a ">" at the start of every line
         result = '<span class="quote">&gt;{}</span>'.format(
                 value.replace(LINE_BREAK_HTML,
                     '{}&gt;'.format(LINE_BREAK_HTML)))
 
     return result
 
 
 def render_notification(tag_name, value, options, parent, content):
     username = value.lower()
 
     return '<a href="{}" class="user-cast">@{}</a>'.format(
         reverse('notifications', kwargs={'username': username}), username)
 
 
+def render_tag(tag_name, value, options, parent, context):
+    tag_name = value.lower()
+
+    try:
+        url = boards.models.Tag.objects.get(name=tag_name).get_view()
+    except ObjectDoesNotExist:
+        url = tag_name
+
+    return url
+
+
 formatters = [
     QuotePattern,
     SpoilerPattern,
     ItalicPattern,
     BoldPattern,
     CommentPattern,
     StrikeThroughPattern,
     CodePattern,
 ]
 
 
 PREPARSE_PATTERNS = {
     r'(?<!>)>>(\d+)': r'[post]\1[/post]',  # Reflink ">>123"
     r'^>([^>].+)': r'[quote]\1[/quote]',  # Quote ">text"
     r'^//(.+)': r'[comment]\1[/comment]',  # Comment "//text"
     r'\B@(\w+)': r'[user]\1[/user]',  # User notification "@user"
 }
 
 
 class Parser:
     def __init__(self):
         # The newline hack is added because br's margin does not work in all
         # browsers except firefox, when the div's does.
         self.parser = bbcode.Parser(newline=LINE_BREAK_HTML)
 
         self.parser.add_formatter('post', render_reflink, strip=True)
         self.parser.add_formatter('quote', render_quote, strip=True)
         self.parser.add_formatter('user', render_notification, strip=True)
+        self.parser.add_formatter('tag', render_tag, strip=True)
         self.parser.add_simple_formatter(
             'comment', '<span class="comment">//%(value)s</span>')
         self.parser.add_simple_formatter(
             'spoiler', '<span class="spoiler">%(value)s</span>')
         self.parser.add_simple_formatter(
             's', '<span class="strikethrough">%(value)s</span>')
         # TODO Why not use built-in tag?
         self.parser.add_simple_formatter('code',
                                          '<pre><code>%(value)s</pre></code>',
                                          render_embedded=False)
 
     def preparse(self, text):
         """
         Performs manual parsing before the bbcode parser is used.
         Preparsed text is saved as raw and the text before preparsing is lost.
         """
         new_text = MULTI_NEWLINES_PATTERN.sub(ONE_NEWLINE, text)
 
         for key, value in PREPARSE_PATTERNS.items():
             new_text = re.sub(key, value, new_text, flags=re.MULTILINE)
 
         for link in REGEX_URL.findall(text):
             new_text = new_text.replace(link, unquote(link))
 
         return new_text
 
     def parse(self, text):
         return self.parser.format(text)