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import re
from askbot import const
from askbot.conf import settings as askbot_settings
from markdown2 import Markdown
#url taken from http://regexlib.com/REDetails.aspx?regexp_id=501 by Brian Bothwell
URL_RE = re.compile("(?<!href=['\"])((http|https|ftp)\://([a-zA-Z0-9\.\-]+(\:[a-zA-Z0-9\.&%\$\-]+)*@)*((25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9])\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[1-9]|0)\.(25[0-5]|2[0-4][0-9]|[0-1]{1}[0-9]{2}|[1-9]{1}[0-9]{1}|[0-9])|localhost|([a-zA-Z0-9\-]+\.)*[a-zA-Z0-9\-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(\:[0-9]+)*(/($|[a-zA-Z0-9\.\,\?\'\\\+&%\$#\=~_\-]+))*)")
LINK_PATTERNS = [
(URL_RE, r'\1'),
]
def get_parser():
extras = ['link-patterns',]
if askbot_settings.ENABLE_MATHJAX or \
askbot_settings.MARKUP_CODE_FRIENDLY:
extras.append('code-friendly')
return Markdown(
html4tags=True,
extras=extras,
link_patterns = LINK_PATTERNS
)
def format_mention_in_html(mentioned_user):
url = mentioned_user.get_profile_url()
username = mentioned_user.username
return '<a href="%s">@%s</a>' % (url, username)
def extract_first_matching_mentioned_author(text, anticipated_authors):
if len(text) == 0:
return None, ''
for a in anticipated_authors:
if text.startswith(a.username):
ulen = len(a.username)
if len(text) == ulen:
text = ''
elif text[ulen] in const.TWITTER_STYLE_MENTION_TERMINATION_CHARS:
text = text[ulen:]
else:
#near miss, here we could insert a warning that perhaps
#a termination character is needed
continue
return a, text
return None, text
def extract_mentioned_name_seeds(text):
extra_name_seeds = set()
while '@' in text:
pos = text.index('@')
text = text[pos+1:]#chop off prefix
name_seed = ''
for c in text:
if c in const.TWITTER_STYLE_MENTION_TERMINATION_CHARS:
extra_name_seeds.add(name_seed)
name_seed = ''
break
if len(name_seed) > 10:
extra_name_seeds.add(name_seed)
name_seed = ''
break
if c == '@':
if len(name_seed) > 0:
extra_name_seeds.add(name_seed)
name_seed = ''
break
name_seed += c
if len(name_seed) > 0:
#in case we run off the end of text
extra_name_seeds.add(name_seed)
return extra_name_seeds
def mentionize_text(text, anticipated_authors):
output = ''
mentioned_authors = list()
while '@' in text:
#the purpose of this loop is to convert any occurance of
#'@mention ' syntax
#to user account links leading space is required unless @ is the first
#character in whole text, also, either a punctuation or
#a ' ' char is required after the name
pos = text.index('@')
#save stuff before @mention to the output
output += text[:pos]#this works for pos == 0 too
if len(text) == pos + 1:
#finish up if the found @ is the last symbol
output += '@'
text = ''
break
if pos > 0:
if text[pos-1] in const.TWITTER_STYLE_MENTION_TERMINATION_CHARS:
#if there is a termination character before @mention
#indeed try to find a matching person
text = text[pos+1:]
mentioned_author, text = \
extract_first_matching_mentioned_author(
text,
anticipated_authors
)
if mentioned_author:
mentioned_authors.append(mentioned_author)
output += format_mention_in_html(mentioned_author)
else:
output += '@'
else:
#if there isn't, i.e. text goes like something@mention,
#do not look up people
output += '@'
text = text[pos+1:]
else:
#do this if @ is the first character
text = text[1:]
mentioned_author, text = \
extract_first_matching_mentioned_author(
text,
anticipated_authors
)
if mentioned_author:
mentioned_authors.append(mentioned_author)
output += format_mention_in_html(mentioned_author)
else:
output += '@'
#append the rest of text that did not have @ symbols
output += text
return mentioned_authors, output
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