151 lines
4.6 KiB
Python
151 lines
4.6 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2020 Dan <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Pyrogram is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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import html
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import re
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from typing import Union
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import pyrogram
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from . import utils
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from .html import HTML
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BOLD_DELIM = "**"
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ITALIC_DELIM = "__"
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UNDERLINE_DELIM = "--"
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STRIKE_DELIM = "~~"
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CODE_DELIM = "`"
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PRE_DELIM = "```"
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MARKDOWN_RE = re.compile(r"({d})|\[(.+?)\]\((.+?)\)".format(
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d="|".join(
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["".join(i) for i in [
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[r"\{}".format(j) for j in i]
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for i in [
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PRE_DELIM,
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CODE_DELIM,
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STRIKE_DELIM,
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UNDERLINE_DELIM,
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ITALIC_DELIM,
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BOLD_DELIM
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]
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]]
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)))
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OPENING_TAG = "<{}>"
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CLOSING_TAG = "</{}>"
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URL_MARKUP = '<a href="{}">{}</a>'
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FIXED_WIDTH_DELIMS = [CODE_DELIM, PRE_DELIM]
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class Markdown:
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def __init__(self, client: Union["pyrogram.BaseClient", None]):
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self.html = HTML(client)
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async def parse(self, text: str, strict: bool = False):
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if strict:
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text = html.escape(text)
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delims = set()
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is_fixed_width = False
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for i, match in enumerate(re.finditer(MARKDOWN_RE, text)):
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start, _ = match.span()
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delim, text_url, url = match.groups()
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full = match.group(0)
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if delim in FIXED_WIDTH_DELIMS:
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is_fixed_width = not is_fixed_width
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if is_fixed_width and delim not in FIXED_WIDTH_DELIMS:
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continue
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if text_url:
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text = utils.replace_once(text, full, URL_MARKUP.format(url, text_url), start)
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continue
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if delim == BOLD_DELIM:
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tag = "b"
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elif delim == ITALIC_DELIM:
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tag = "i"
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elif delim == UNDERLINE_DELIM:
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tag = "u"
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elif delim == STRIKE_DELIM:
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tag = "s"
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elif delim == CODE_DELIM:
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tag = "code"
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elif delim == PRE_DELIM:
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tag = "pre"
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else:
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continue
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if delim not in delims:
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delims.add(delim)
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tag = OPENING_TAG.format(tag)
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else:
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delims.remove(delim)
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tag = CLOSING_TAG.format(tag)
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text = utils.replace_once(text, delim, tag, start)
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return await self.html.parse(text)
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@staticmethod
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def unparse(text: str, entities: list):
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text = utils.add_surrogates(text)
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entities_offsets = []
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for entity in entities:
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entity_type = entity.type
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start = entity.offset
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end = start + entity.length
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if entity_type == "bold":
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start_tag = end_tag = BOLD_DELIM
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elif entity_type == "italic":
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start_tag = end_tag = ITALIC_DELIM
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elif entity_type == "underline":
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start_tag = end_tag = UNDERLINE_DELIM
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elif entity_type == "strike":
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start_tag = end_tag = STRIKE_DELIM
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elif entity_type == "code":
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start_tag = end_tag = CODE_DELIM
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elif entity_type in ("pre", "blockquote"):
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start_tag = end_tag = PRE_DELIM
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elif entity_type == "text_link":
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url = entity.url
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start_tag = "["
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end_tag = "]({})".format(url)
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elif entity_type == "text_mention":
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user = entity.user
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start_tag = "["
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end_tag = "](tg://user?id={})".format(user.id)
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else:
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continue
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entities_offsets.append((start_tag, start,))
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entities_offsets.append((end_tag, end,))
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# sorting by offset (desc)
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entities_offsets.sort(key=lambda x: -x[1])
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for entity, offset in entities_offsets:
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text = text[:offset] + entity + text[offset:]
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return utils.remove_surrogates(text)
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