def memoize(links, domain):
maintain_directory()
if not os.path.exists(os.path.join(os.getcwd(), MEMO_DIRECTORY)):
os.mkdir(MEMO_DIRECTORY)
os.chdir(MEMO_DIRECTORY)
# Else, we are already in the memoized articles file
memo = {link.href : link for link in links}
# If we are on our 2nd run or above, we begin to memoize
if os.path.exists(domain_to_key(domain)):
# r+ means open to reading and writing, file is not truncated down
file_obj = open(domain_to_key(domain), "r+")
# Python automatically handles platform differences \n handles \r\n also
# Do not refactor into file_obj.read().split("\n"), for whatever reason,
# that gives an empty string as output, as some weird bug?
saved_links = file_obj.read()
# Chop off the last element, it's just an empty string
saved_links = saved_links.split("\n")[:-1]
file_obj.close()
for link in saved_links:
if memo.get(link): # If the link lasts so long on a page, it's not news
del memo[link]
text = ""
for link in memo.keys():
text += link + "\n"
# Override the txt file with a new list of links, for next time
write_unicode_to_file(domain_to_key(domain) ,safe_unicode(text), "w")
# Construct the new list of links (objects)
survived_links = memo.values()
return survived_links
def extract_data(link, get_objects):
maintain_directory()
try:
html = urllib2.urlopen(link.href).read()
except Exception:
return # Bust link, keep going
obj = MaxSubSequence(html)
txt, title = obj.MaxSubSequence(), ""
if txt is None:
return # Beautiful Soup unicode error we need to account for
title = obj.getTitle()
if link.title is None: # If the title was not captured in the seeker, try once more
link.title = title
# Create txt file with link, title, date, body, all in UNICODE
total = PROPERTY_DELIMITER.join([link.href,
safe_unicode(title), safe_unicode(txt)]) + ARTICLE_DELIMITER
article_file = codecs.open(SAVED_DIRECTORY, "a+", "utf-8")
article_file.write(total)
article_file.close()
if get_objects:
link.text = txt
return link
