Initial split to htmlparser/lxml matrix->telegram formatters
This commit is contained in:
Tulir Asokan
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# -*- coding: future_fstrings -*-
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# mautrix-telegram - A Matrix-Telegram puppeting bridge
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# Copyright (C) 2018 Tulir Asokan
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# 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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# This program 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from html import unescape
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from html.parser import HTMLParser
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from collections import deque
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from typing import Optional, List, Tuple, Type, Dict, Any
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import math
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from telethon.tl.types import (MessageEntityMention, MessageEntityMentionName, MessageEntityEmail,
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MessageEntityUrl, MessageEntityTextUrl, MessageEntityBold,
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MessageEntityItalic, MessageEntityCode, MessageEntityPre,
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MessageEntityBotCommand, TypeMessageEntity)
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from ... import user as u, puppet as pu, portal as po
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from ..util import html_to_unicode
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from .parser_common import MatrixParserCommon, ParsedMessage
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def parse_html(html: str) -> ParsedMessage:
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parser = MatrixParser()
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parser.feed(html)
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return parser.text, parser.entities
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class MatrixParser(HTMLParser, MatrixParserCommon):
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def __init__(self):
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super(HTMLParser, self).__init__()
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self.text = ""
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self.entities = []
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self._building_entities = {}
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self._list_counter = 0
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self._open_tags = deque()
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self._open_tags_meta = deque()
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self._line_is_new = True
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self._list_entry_is_new = False
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def _parse_url(self, url: str, args: Dict[str, Any]
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) -> Tuple[Optional[Type[TypeMessageEntity]], Optional[str]]:
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mention = self.mention_regex.match(url)
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if mention:
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mxid = mention.group(1)
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user = (pu.Puppet.get_by_mxid(mxid)
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or u.User.get_by_mxid(mxid, create=False))
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if not user:
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return None, None
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if user.username:
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return MessageEntityMention, f"@{user.username}"
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elif user.tgid:
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args["user_id"] = user.tgid
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return MessageEntityMentionName, user.displayname or None
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else:
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return None, None
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room = self.room_regex.match(url)
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if room:
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username = po.Portal.get_username_from_mx_alias(room.group(1))
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portal = po.Portal.find_by_username(username)
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if portal and portal.username:
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return MessageEntityMention, f"@{portal.username}"
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if url.startswith("mailto:"):
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return MessageEntityEmail, url[len("mailto:"):]
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elif self.get_starttag_text() == url:
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return MessageEntityUrl, url
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else:
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args["url"] = url
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return MessageEntityTextUrl, None
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def handle_starttag(self, tag: str, attrs: List[Tuple[str, str]]):
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self._open_tags.appendleft(tag)
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self._open_tags_meta.appendleft(0)
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attrs = dict(attrs)
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entity_type = None
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args = {}
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if tag in ("strong", "b"):
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entity_type = MessageEntityBold
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elif tag in ("em", "i"):
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entity_type = MessageEntityItalic
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elif tag == "code":
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try:
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pre = self._building_entities["pre"]
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try:
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# Pre tag and language found, add language to MessageEntityPre
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pre.language = attrs["class"][len("language-"):]
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except KeyError:
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# Pre tag found, but language not found, keep pre as-is
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pass
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except KeyError:
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# No pre tag found, this is inline code
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entity_type = MessageEntityCode
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elif tag == "pre":
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entity_type = MessageEntityPre
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args["language"] = ""
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elif tag == "command":
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entity_type = MessageEntityBotCommand
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elif tag == "li":
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self._list_entry_is_new = True
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elif tag == "a":
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try:
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url = attrs["href"]
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except KeyError:
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return
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entity_type, url = self._parse_url(url, args)
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self._open_tags_meta.popleft()
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self._open_tags_meta.appendleft(url)
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if tag in self.block_tags and ("blockquote" not in self._open_tags or tag == "br"):
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self._newline()
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if entity_type and tag not in self._building_entities:
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offset = len(self.text)
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self._building_entities[tag] = entity_type(offset=offset, length=0, **args)
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@property
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def _list_indent(self) -> int:
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indent = 0
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first_skipped = False
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for index, tag in enumerate(self._open_tags):
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if not first_skipped and tag in ("ol", "ul"):
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# The first list level isn't indented, so skip it.
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first_skipped = True
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continue
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if tag == "ol":
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n = self._open_tags_meta[index]
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extra_length_for_long_index = (int(math.log(n, 10)) - 1) * 3
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indent += 4 + extra_length_for_long_index
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elif tag == "ul":
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indent += 3
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return indent
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def _newline(self, allow_multi: bool = False):
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if self._line_is_new and not allow_multi:
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return
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self.text += "\n"
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self._line_is_new = True
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for entity in self._building_entities.values():
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entity.length += 1
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def _handle_special_previous_tags(self, text: str) -> str:
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if "pre" not in self._open_tags and "code" not in self._open_tags:
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text = text.replace("\n", "")
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else:
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text = text.strip()
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previous_tag = self._open_tags[0] if len(self._open_tags) > 0 else ""
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if previous_tag == "a":
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url = self._open_tags_meta[0]
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if url:
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text = url
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elif previous_tag == "command":
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text = f"/{text}"
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return text
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def _html_to_unicode(self, text: str) -> str:
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strikethrough, underline = "del" in self._open_tags, "u" in self._open_tags
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if strikethrough and underline:
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text = html_to_unicode(text, "\u0336\u0332")
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elif strikethrough:
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text = html_to_unicode(text, "\u0336")
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elif underline:
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text = html_to_unicode(text, "\u0332")
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return text
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def _handle_tags_for_data(self, text: str) -> Tuple[str, int]:
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extra_offset = 0
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list_entry_handled_once = False
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# In order to maintain order of things like blockquotes in lists or lists in blockquotes,
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# we can't just have ifs/elses and we need to actually loop through the open tags in order.
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for index, tag in enumerate(self._open_tags):
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if tag == "blockquote" and self._line_is_new:
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text = f"> {text}"
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extra_offset += 2
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elif tag == "li" and not list_entry_handled_once:
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list_type_index = index + 1
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list_type = self._open_tags[list_type_index]
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indent = self._list_indent * " " if self._line_is_new else ""
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if list_type == "ol":
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n = self._open_tags_meta[list_type_index]
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if self._list_entry_is_new:
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n += 1
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self._open_tags_meta[list_type_index] = n
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prefix = f"{n}. "
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else:
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prefix = int(math.log(n, 10)) * 3 * " " + 4 * " "
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else:
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prefix = "* " if self._list_entry_is_new else 3 * " "
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if not self._list_entry_is_new and not self._line_is_new:
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prefix = ""
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extra_offset += len(indent) + len(prefix)
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text = indent + prefix + text
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self._list_entry_is_new = False
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list_entry_handled_once = True
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return text, extra_offset
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def _extend_entities_in_construction(self, text: str, extra_offset: int):
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for tag, entity in self._building_entities.items():
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entity.length += len(text) - extra_offset
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entity.offset += extra_offset
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def handle_data(self, text: str):
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text = unescape(text)
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text = self._handle_special_previous_tags(text)
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text = self._html_to_unicode(text)
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text, extra_offset = self._handle_tags_for_data(text)
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self._extend_entities_in_construction(text, extra_offset)
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self._line_is_new = False
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self.text += text
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def handle_endtag(self, tag: str):
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try:
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self._open_tags.popleft()
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self._open_tags_meta.popleft()
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except IndexError:
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pass
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entity = self._building_entities.pop(tag, None)
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if entity:
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self.entities.append(entity)
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if tag in self.block_tags and tag != "br" and "blockquote" not in self._open_tags:
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self._newline(allow_multi=tag == "br")
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