hydrogram/hydrogram/parser/html.py at dev · planebees/hydrogram · GitHub

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# Hydrogram - Telegram MTProto API Client Library for Python

# This file is part of Hydrogram.

# Hydrogram 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.

# Hydrogram 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 Hydrogram. If not, see <http://www.gnu.org/licenses/>.

import html

import logging

import re

from html.parser import HTMLParser

from typing import Optional

import hydrogram

from hydrogram import raw

from hydrogram.enums import MessageEntityType

from hydrogram.errors import PeerIdInvalid

from . import utils

log = logging.getLogger(__name__)

class Parser(HTMLParser):

MENTION_RE = re.compile(r"tg://user\?id=(\d+)")

def __init__(self, client: "hydrogram.Client"):

super().__init__()

self.client = client

self.text = ""

self.entities = []

self.tag_entities = {}

def handle_starttag(self, tag, attrs):

attrs = dict(attrs)

extra = {}

if tag in {"b", "strong"}:

entity = raw.types.MessageEntityBold

elif tag in {"i", "em"}:

entity = raw.types.MessageEntityItalic

elif tag == "u":

entity = raw.types.MessageEntityUnderline

elif tag in {"s", "del", "strike"}:

entity = raw.types.MessageEntityStrike

elif tag == "blockquote":

entity = raw.types.MessageEntityBlockquote

elif tag == "code":

entity = raw.types.MessageEntityCode

elif tag == "pre":

entity = raw.types.MessageEntityPre

extra["language"] = attrs.get("language", "")

elif tag == "spoiler":

entity = raw.types.MessageEntitySpoiler

elif tag == "a":

url = attrs.get("href", "")

if mention := Parser.MENTION_RE.match(url):

entity = raw.types.InputMessageEntityMentionName

extra["user_id"] = int(mention.group(1))

else:

entity = raw.types.MessageEntityTextUrl

extra["url"] = url

elif tag == "emoji":

entity = raw.types.MessageEntityCustomEmoji

custom_emoji_id = int(attrs.get("id"))

extra["document_id"] = custom_emoji_id

else:

return

if tag not in self.tag_entities:

self.tag_entities[tag] = []

self.tag_entities[tag].append(entity(offset=len(self.text), length=0, **extra))

def handle_data(self, data):

data = html.unescape(data)

for entities in self.tag_entities.values():

for entity in entities:

entity.length += len(data)

self.text += data

def handle_endtag(self, tag):

try:

self.entities.append(self.tag_entities[tag].pop())

except (KeyError, IndexError):

line, offset = self.getpos()

offset += 1

log.debug("Unmatched closing tag </%s> at line %s:%s", tag, line, offset)

else:

if not self.tag_entities[tag]:

self.tag_entities.pop(tag)

def error(self, message):

pass

class HTML:

def __init__(self, client: Optional["hydrogram.Client"]):

self.client = client

async def parse(self, text: str):

# Strip whitespaces from the beginning and the end, but preserve closing tags

text = re.sub(r"^\s*(<[\w<>=\s\"]*>)\s*", r"\1", text)

text = re.sub(r"\s*(</[\w</>]*>)\s*$", r"\1", text)

parser = Parser(self.client)

parser.feed(utils.add_surrogates(text))

parser.close()

if parser.tag_entities:

unclosed_tags = []

for tag, entities in parser.tag_entities.items():

unclosed_tags.append(f"<{tag}> (x{len(entities)})")

log.info("Unclosed tags: %s", ", ".join(unclosed_tags))

entities = []

for entity in parser.entities:

if isinstance(entity, raw.types.InputMessageEntityMentionName):

try:

if self.client is not None:

entity.user_id = await self.client.resolve_peer(entity.user_id)

except PeerIdInvalid:

continue

entities.append(entity)

# Remove zero-length entities

entities = list(filter(lambda x: x.length > 0, entities))

return {

"message": utils.remove_surrogates(parser.text),

"entities": sorted(entities, key=lambda e: e.offset) or None,

}

@staticmethod

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

def parse_one(entity):

"""

Parses a single entity and returns (start_tag, start), (end_tag, end)

"""

entity_type = entity.type

start = entity.offset

end = start + entity.length

if entity_type in {

MessageEntityType.BOLD,

MessageEntityType.ITALIC,

MessageEntityType.UNDERLINE,

MessageEntityType.STRIKETHROUGH,

name = entity_type.name[0].lower()

start_tag = f"<{name}>"

end_tag = f"</{name}>"

elif entity_type == MessageEntityType.PRE:

name = entity_type.name.lower()

language = getattr(entity, "language", "") or ""

start_tag = f'<{name} language="{language}">' if language else f"<{name}>"

end_tag = f"</{name}>"

elif entity_type in {

MessageEntityType.CODE,

MessageEntityType.BLOCKQUOTE,

MessageEntityType.SPOILER,

name = entity_type.name.lower()

start_tag = f"<{name}>"

end_tag = f"</{name}>"

elif entity_type == MessageEntityType.TEXT_LINK:

url = entity.url

start_tag = f'<a href="{url}">'

end_tag = "</a>"

elif entity_type == MessageEntityType.TEXT_MENTION:

user = entity.user

start_tag = f'<a href="tg://user?id={user.id}">'

end_tag = "</a>"

elif entity_type == MessageEntityType.CUSTOM_EMOJI:

custom_emoji_id = entity.custom_emoji_id

start_tag = f'<emoji id="{custom_emoji_id}">'

end_tag = "</emoji>"

else:

return None

return (start_tag, start), (end_tag, end)

def recursive(entity_i: int) -> int:

"""

Takes the index of the entity to start parsing from, returns the number of parsed entities inside it.

Uses entities_offsets as a stack, pushing (start_tag, start) first, then parsing nested entities,

and finally pushing (end_tag, end) to the stack.

No need to sort at the end.

"""

this = parse_one(entities[entity_i])

if this is None:

return 1

(start_tag, start), (end_tag, end) = this

entities_offsets.append((start_tag, start))

internal_i = entity_i + 1

# while the next entity is inside the current one, keep parsing

while internal_i < len(entities) and entities[internal_i].offset < end:

internal_i += recursive(internal_i)

entities_offsets.append((end_tag, end))

return internal_i - entity_i

text = utils.add_surrogates(text)

entities_offsets = []

# probably useless because entities are already sorted by telegram

entities.sort(key=lambda e: (e.offset, -e.length))

# main loop for first-level entities

i = 0

while i < len(entities):

i += recursive(i)

if entities_offsets:

last_offset = entities_offsets[-1][1]

# no need to sort, but still add entities starting from the end

for entity, offset in reversed(entities_offsets):

text = (

text[:offset]

+ entity

+ html.escape(text[offset:last_offset])

+ text[last_offset:]

)

last_offset = offset

return utils.remove_surrogates(text)

hydrogram/hydrogram/parser/html.py at dev · planebees/hydrogram · GitHub

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