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# coding=utf-8
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import re
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import random
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import bbcode
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from urllib.parse import unquote
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from django.core.exceptions import ObjectDoesNotExist
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from django.core.urlresolvers import reverse
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import boards
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__author__ = 'neko259'
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REFLINK_PATTERN = re.compile(r'^\d+$')
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GLOBAL_REFLINK_PATTERN = re.compile(r'(\w+)::([^:]+)::(\d+)')
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MULTI_NEWLINES_PATTERN = re.compile(r'(\r?\n){2,}')
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ONE_NEWLINE = '\n'
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REGEX_URL = re.compile(r'https?\://[a-zA-Z0-9\-\.]+\.[a-zA-Z]{2,3}(/\S*)?')
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LINE_BREAK_HTML = '<div class="br"></div>'
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SPOILER_SPACE = ' '
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MAX_SPOILER_MULTIPLIER = 2
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class TextFormatter():
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"""
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An interface for formatter that can be used in the text format panel
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"""
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def __init__(self):
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pass
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name = ''
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# Left and right tags for the button preview
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preview_left = ''
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preview_right = ''
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# Left and right characters for the textarea input
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format_left = ''
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format_right = ''
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class AutolinkPattern():
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def handleMatch(self, m):
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link_element = etree.Element('a')
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href = m.group(2)
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link_element.set('href', href)
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link_element.text = href
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return link_element
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class QuotePattern(TextFormatter):
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name = '>q'
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preview_left = '<span class="quote">'
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preview_right = '</span>'
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format_left = '[quote]'
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format_right = '[/quote]'
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class SpoilerPattern(TextFormatter):
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name = 'spoiler'
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preview_left = '<span class="spoiler">'
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preview_right = '</span>'
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format_left = '[spoiler]'
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format_right = '[/spoiler]'
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class CommentPattern(TextFormatter):
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name = ''
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preview_left = '<span class="comment">// '
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preview_right = '</span>'
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format_left = '[comment]'
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format_right = '[/comment]'
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# TODO Use <s> tag here
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class StrikeThroughPattern(TextFormatter):
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name = 's'
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preview_left = '<span class="strikethrough">'
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preview_right = '</span>'
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format_left = '[s]'
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format_right = '[/s]'
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class ItalicPattern(TextFormatter):
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name = 'i'
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preview_left = '<i>'
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preview_right = '</i>'
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format_left = '[i]'
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format_right = '[/i]'
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class BoldPattern(TextFormatter):
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name = 'b'
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preview_left = '<b>'
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preview_right = '</b>'
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format_left = '[b]'
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format_right = '[/b]'
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class CodePattern(TextFormatter):
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name = 'code'
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preview_left = '<code>'
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preview_right = '</code>'
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format_left = '[code]'
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format_right = '[/code]'
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class HintPattern(TextFormatter):
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name = 'hint'
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preview_left = '<span class="hint">'
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preview_right = '</span>'
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format_left = '[hint]'
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format_right = '[/hint]'
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def render_reflink(tag_name, value, options, parent, context):
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result = '>>%s' % value
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post = None
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if REFLINK_PATTERN.match(value):
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post_id = int(value)
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try:
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post = boards.models.Post.objects.get(id=post_id)
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except ObjectDoesNotExist:
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pass
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elif GLOBAL_REFLINK_PATTERN.match(value):
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match = GLOBAL_REFLINK_PATTERN.search(value)
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try:
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global_id = boards.models.GlobalId.objects.get(
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key_type=match.group(1), key=match.group(2),
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local_id=match.group(3))
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post = global_id.post
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except ObjectDoesNotExist:
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pass
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if post is not None:
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result = post.get_link_view()
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return result
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def render_quote(tag_name, value, options, parent, context):
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source = ''
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if 'source' in options:
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source = options['source']
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elif 'quote' in options:
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source = options['quote']
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if source:
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result = '<div class="multiquote"><div class="quote-header">%s</div><div class="quote-text">%s</div></div>' % (source, value)
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else:
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# Insert a ">" at the start of every line
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result = '<span class="quote">>{}</span>'.format(
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value.replace(LINE_BREAK_HTML,
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'{}>'.format(LINE_BREAK_HTML)))
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return result
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def render_hint(tag_name, value, options, parent, context):
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if 'hint' in options:
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hint = options['hint']
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result = '<span class="hint" title="{}">{}</span>'.format(hint, value)
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else:
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result = value
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return result
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def render_notification(tag_name, value, options, parent, content):
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username = value.lower()
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return '<a href="{}" class="user-cast">@{}</a>'.format(
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reverse('notifications', kwargs={'username': username}), username)
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def render_tag(tag_name, value, options, parent, context):
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tag_name = value.lower()
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try:
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url = boards.models.Tag.objects.get(name=tag_name).get_view()
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except ObjectDoesNotExist:
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url = tag_name
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return url
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def render_spoiler(tag_name, value, options, parent, context):
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text_len = len(value)
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space_count = random.randint(0, text_len * MAX_SPOILER_MULTIPLIER)
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side_spaces = SPOILER_SPACE * (space_count // 2)
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return '<span class="spoiler">{}{}{}</span>'.format(side_spaces, value,
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side_spaces)
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formatters = [
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QuotePattern,
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SpoilerPattern,
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ItalicPattern,
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BoldPattern,
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CommentPattern,
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StrikeThroughPattern,
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CodePattern,
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HintPattern,
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]
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PREPARSE_PATTERNS = {
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r'(?<!>)>>(\d+)': r'[post]\1[/post]', # Reflink ">>123"
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r'^>([^>].+)': r'[quote]\1[/quote]', # Quote ">text"
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r'^//(.+)': r'[comment]\1[/comment]', # Comment "//text"
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r'\B@(\w+)': r'[user]\1[/user]', # User notification "@user"
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}
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class Parser:
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def __init__(self):
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# The newline hack is added because br's margin does not work in all
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# browsers except firefox, when the div's does.
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self.parser = bbcode.Parser(newline=LINE_BREAK_HTML)
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self.parser.add_formatter('post', render_reflink, strip=True)
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self.parser.add_formatter('quote', render_quote, strip=True)
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self.parser.add_formatter('hint', render_hint, strip=True)
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self.parser.add_formatter('user', render_notification, strip=True)
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self.parser.add_formatter('tag', render_tag, strip=True)
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self.parser.add_formatter('spoiler', render_spoiler, strip=True)
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self.parser.add_simple_formatter(
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'comment', '<span class="comment">//%(value)s</span>')
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self.parser.add_simple_formatter(
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's', '<span class="strikethrough">%(value)s</span>')
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self.parser.add_simple_formatter('code',
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'<pre><code>%(value)s</pre></code>',
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render_embedded=False,
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escape_html=True,
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replace_links=False,
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replace_cosmetic=False)
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def preparse(self, text):
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"""
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Performs manual parsing before the bbcode parser is used.
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Preparsed text is saved as raw and the text before preparsing is lost.
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"""
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new_text = MULTI_NEWLINES_PATTERN.sub(ONE_NEWLINE, text)
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for key, value in PREPARSE_PATTERNS.items():
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new_text = re.sub(key, value, new_text, flags=re.MULTILINE)
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for link in REGEX_URL.findall(text):
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new_text = new_text.replace(link, unquote(link))
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return new_text
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def parse(self, text):
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return self.parser.format(text)
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parser = Parser()
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def get_parser():
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return parser
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