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# Pyrogram - Telegram MTProto API Client Library for Python

# Copyright (C) 2017-2020 Dan <https://github.com/delivrance>

#

# This file is part of Pyrogram.

#

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

import html

import re

from typing import Union

import pyrogram

from . import utils

from .html import HTML

BOLD_DELIM = "**"

ITALIC_DELIM = "__"

UNDERLINE_DELIM = "--"

STRIKE_DELIM = "~~"

CODE_DELIM = "`"

PRE_DELIM = "```"

MARKDOWN_RE = re.compile(r"({d})|\[(.+?)\]\((.+?)\)".format(

d="|".join(

["".join(i) for i in [

[rf"\{j}" for j in i]

for i in [

PRE_DELIM,

CODE_DELIM,

STRIKE_DELIM,

UNDERLINE_DELIM,

ITALIC_DELIM,

BOLD_DELIM

]

]]

)))

OPENING_TAG = "<{}>"

CLOSING_TAG = "</{}>"

URL_MARKUP = '<a href="{}">{}</a>'

FIXED_WIDTH_DELIMS = [CODE_DELIM, PRE_DELIM]

class Markdown:

def __init__(self, client: Union["pyrogram.Client", None]):

self.html = HTML(client)

async def parse(self, text: str, strict: bool = False):

if strict:

text = html.escape(text)

delims = set()

is_fixed_width = False

for i, match in enumerate(re.finditer(MARKDOWN_RE, text)):

start, _ = match.span()

delim, text_url, url = match.groups()

full = match.group(0)

if delim in FIXED_WIDTH_DELIMS:

is_fixed_width = not is_fixed_width

if is_fixed_width and delim not in FIXED_WIDTH_DELIMS:

continue

if text_url:

text = utils.replace_once(text, full, URL_MARKUP.format(url, text_url), start)

continue

if delim == BOLD_DELIM:

tag = "b"

elif delim == ITALIC_DELIM:

tag = "i"

elif delim == UNDERLINE_DELIM:

tag = "u"

elif delim == STRIKE_DELIM:

tag = "s"

elif delim == CODE_DELIM:

tag = "code"

elif delim == PRE_DELIM:

tag = "pre"

else:

continue

if delim not in delims:

delims.add(delim)

tag = OPENING_TAG.format(tag)

else:

delims.remove(delim)

tag = CLOSING_TAG.format(tag)

text = utils.replace_once(text, delim, tag, start)

return await self.html.parse(text)

@staticmethod

def unparse(text: str, entities: list):

text = utils.add_surrogates(text)

entities_offsets = []

for entity in entities:

entity_type = entity.type

start = entity.offset

end = start + entity.length

if entity_type == "bold":

start_tag = end_tag = BOLD_DELIM

elif entity_type == "italic":

start_tag = end_tag = ITALIC_DELIM

elif entity_type == "underline":

start_tag = end_tag = UNDERLINE_DELIM

elif entity_type == "strike":

start_tag = end_tag = STRIKE_DELIM

elif entity_type == "code":

start_tag = end_tag = CODE_DELIM

elif entity_type in ("pre", "blockquote"):

start_tag = end_tag = PRE_DELIM

elif entity_type == "text_link":

url = entity.url

start_tag = "["

end_tag = f"]({url})"

elif entity_type == "text_mention":

user = entity.user

start_tag = "["

end_tag = f"](tg://user?id={user.id})"

else:

continue

entities_offsets.append((start_tag, start,))

entities_offsets.append((end_tag, end,))

# sorting by offset (desc)

entities_offsets.sort(key=lambda x: -x[1])

for entity, offset in entities_offsets:

text = text[:offset] + entity + text[offset:]

return utils.remove_surrogates(text)