Re: [Python-markdown-discuss] AtomicString

[Artem Y. <ne...@gm...>]

Yuri Takhteyev wrote:
>> Maybe we should use some random hashes, like
>> `md5.new(str(random.random())).hexdigest()` ?
>> I don't think that users will be handle with placeholders, in case if
>> everything works fine.
>>     
>
> We could do that, though it might be better to avoid any actual
> randomness by using a fixed seed:
>
> def reset_placeholders(seed = DEFAULT_SEED) :
>     self.seed = seed
>     random.seed(seed)
>     self.html_placeholder_prefix  = STX+"%x" % (random.random()*1000000000)
>     self.html_placeholder  = self.html_placeholder.prefix  + "%x" + ETX
>     ...
>
> and later generate HTML placeholders with
>
>      random.seed(self.seed + i)
>      self.html_placeholder % (random.random()*1000000000)
>
> Or something more like:
>
> def get_random_token(n = 10)
>     return "".join(["abcdefghijklmnopqrstuvwxyx"[int(random.random()*26)]
> for i in range(n)])
>
> def reset_placeholders(seed = DEFAULT_SEED) :
>     random.seed(seed)
>     self.html_placeholder_prefix  = STX + get_random_token()
>     self.html_placeholder  = self.html_placeholder_prefix  + "%s" + ETX
>
>  - yuri
>
>   

I agree, using seed is better idea.

What about something like this:

RND_SEED = 789654
 
def getRandomToken(n=10, seed=RND_SEED):
    random.seed(seed)
    return "".join([chr(random.randint(97, 122)) for i in range(n)])

STX = u'\u0002'  # Use STX ("Start of text") for start-of-placeholder
ETX = u'\u0003'  # Use ETX ("End of text") for end-of-placeholder
HTML_PLACEHOLDER_PREFIX = STX + getRandomToken()
HTML_PLACEHOLDER = HTML_PLACEHOLDER_PREFIX + "%s" + ETX
INLINE_PLACEHOLDER_PREFIX = STX + getRandomToken()
INLINE_PLACEHOLDER = INLINE_PLACEHOLDER_PREFIX + "%s" + ETX

or maybe wrap it in class, as you did.