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syntaxes.py
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65 lines (51 loc) · 1.84 KB
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"""
botogram.syntaxes
Definition of the different message syntaxes
Copyright (c) 2016 Pietro Albini <pietro@pietroalbini.io>
Released under the MIT license
"""
import re
from . import utils
_markdown_re = re.compile(r".*("
r"\*(.*)\*|"
r"_(.*)_|"
r"\[(.*)\]\((.*)\)|"
r"`(.*)`|"
r"```(.*)```"
r").*")
_html_re = re.compile(r".*("
r"<b>(.*)<\/b>|"
r"<strong>(.*)<\/strong>|"
r"<i>(.*)<\/i>|"
r"<em>(.*)<\/em>|"
r"<a\shref=\"(.*)\">(.*)<\/a>|"
r"<code>(.*)<\/code>|"
r"<pre>(.*)<\/pre>"
r").*")
def is_markdown(message):
"""Check if a string is actually markdown"""
# Don't mark part of URLs or email addresses as Markdown
message = utils.strip_urls(message)
return bool(_markdown_re.match(message.replace("\n", "")))
def is_html(message):
"""Check if a string is actually HTML"""
# Here URLs are not stripped because no sane URL contains HTML tags in it,
# and for a few cases the speed penality is not worth
return bool(_html_re.match(message.replace("\n", "")))
def guess_syntax(message, provided):
"""Guess the right syntax for a message"""
if provided is None:
if is_markdown(message):
return "Markdown"
elif is_html(message):
return "HTML"
else:
return None
if provided in ("plain",):
return None
elif provided in ("md", "markdown", "Markdown"):
return "Markdown"
elif provided in ("html", "HTML"):
return "HTML"
else:
raise ValueError("Invalid syntax: %s" % provided)