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Updated Sending more than just messages (markdown)
YouKnow
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@ -120,3 +120,223 @@ client.send_message('me', 'hello this is a [hidden text](spoiler), with custom e
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```
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You may have noticed the emoji URL is followed by a number. This number is a `document_id`. To find it, the easiest way is to send a message to your own chat with the premium emoji you want to use using an official client, and then use Telethon to print the `message.entities`. It will contain the `document_id` you need to use.
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<details>
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<summary>Full html parser/unparser example </summary>
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A full example of html parser and unparser that have both spoiler and custom emoji.\
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you can use this code exactly like how would use the custom markdown parser mentioned above, just set `parse_mode` to `CustomHtmlParser()` and you are done.
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```python
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"""
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Simple HTML -> Telegram entity parser.
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"""
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from collections import deque
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from html import escape
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from html.parser import HTMLParser
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from typing import Iterable, Tuple, List
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from telethon.helpers import add_surrogate, del_surrogate, within_surrogate, strip_text
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from telethon.tl import TLObject
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from telethon.types import (
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MessageEntityBold, MessageEntityItalic, MessageEntityCode,
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MessageEntityPre, MessageEntityEmail, MessageEntityUrl,
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MessageEntityTextUrl, MessageEntityMentionName,
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MessageEntityUnderline, MessageEntityStrike, MessageEntityBlockquote,
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MessageEntityCustomEmoji, MessageEntitySpoiler, TypeMessageEntity
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)
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class HTMLToTelegramParser(HTMLParser):
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def __init__(self):
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super().__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._open_tags = deque()
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self._open_tags_meta = deque()
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def handle_starttag(self, tag, attrs):
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self._open_tags.appendleft(tag)
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self._open_tags_meta.appendleft(None)
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attrs = dict(attrs)
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EntityType = None
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args = {}
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match tag:
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case 'strong' | 'b':
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EntityType = MessageEntityBold
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case 'em' | 'i':
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EntityType = MessageEntityItalic
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case 'u':
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EntityType = MessageEntityUnderline
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case 'del' | 's':
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EntityType = MessageEntityStrike
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case 'blockquote':
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EntityType = MessageEntityBlockquote
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case 'tg-spoiler':
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EntityType = MessageEntitySpoiler
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case 'code':
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try:
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# If we're in the middle of a <pre> tag, this <code> tag is
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# probably intended for syntax highlighting.
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#
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# Syntax highlighting is set with
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# <code class='language-...'>codeblock</code>
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# inside <pre> tags
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pre = self._building_entities['pre']
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try:
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pre.language = attrs['class'][len('language-'):] # type: ignore
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except KeyError:
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pass
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except KeyError:
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EntityType = MessageEntityCode
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case 'pre':
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EntityType = MessageEntityPre
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args['language'] = ''
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case 'a':
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try:
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url = attrs['href']
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if not url:
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raise KeyError
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except KeyError:
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return
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if url.startswith('mailto:'):
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url = url[len('mailto:'):]
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EntityType = MessageEntityEmail
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else:
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if self.get_starttag_text() == url:
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EntityType = MessageEntityUrl
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else:
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EntityType = MessageEntityTextUrl
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args['url'] = del_surrogate(url)
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url = None
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self._open_tags_meta.popleft()
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self._open_tags_meta.appendleft(url)
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case 'tg-emoji':
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try:
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emoji_id = attrs['emoji-id']
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if not emoji_id:
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raise ValueError
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emoji_id = int(emoji_id)
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except (KeyError, ValueError):
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return
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EntityType = MessageEntityCustomEmoji
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args['document_id'] = emoji_id
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if EntityType and tag not in self._building_entities:
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self._building_entities[tag] = EntityType(
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offset=len(self.text),
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# The length will be determined when closing the tag.
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length=0,
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**args)
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def handle_data(self, data):
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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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data = url
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for tag, entity in self._building_entities.items():
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entity.length += len(data)
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self.text += data
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def handle_endtag(self, tag):
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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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ENTITY_TO_FORMATTER = {
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MessageEntityBold: ('<strong>', '</strong>'),
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MessageEntityItalic: ('<em>', '</em>'),
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MessageEntityCode: ('<code>', '</code>'),
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MessageEntityUnderline: ('<u>', '</u>'),
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MessageEntityStrike: ('<del>', '</del>'),
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MessageEntityBlockquote: ('<blockquote>', '</blockquote>'),
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MessageEntitySpoiler: ('<tg-spoiler>', '</tg-spoiler>'),
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MessageEntityPre: lambda e, _: (
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"<pre>\n"
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" <code class='language-{}'>\n"
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" ".format(e.language), "{}\n"
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" </code>\n"
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"</pre>"
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),
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MessageEntityEmail: lambda _, t: ('<a href="mailto:{}">'.format(t), '</a>'),
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MessageEntityUrl: lambda _, t: ('<a href="{}">'.format(t), '</a>'),
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MessageEntityTextUrl: lambda e, _: ('<a href="{}">'.format(escape(e.url)), '</a>'),
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MessageEntityMentionName: lambda e, _: ('<a href="tg://user?id={}">'.format(e.user_id), '</a>'),
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MessageEntityCustomEmoji: lambda e, _: ('<tg-emoji emoji-id="{}">'.format(e.document_id), '</tg-emoji>')
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}
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class CustomHtmlParser:
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@staticmethod
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def parse(html: str) -> Tuple[str, List[TypeMessageEntity]]:
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"""
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Parses the given HTML message and returns its stripped representation
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plus a list of the MessageEntity's that were found.
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:param html: the message with HTML to be parsed.
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:return: a tuple consisting of (clean message, [message entities]).
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"""
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if not html:
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return html, []
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parser = HTMLToTelegramParser()
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parser.feed(add_surrogate(html))
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text = strip_text(parser.text, parser.entities)
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parser.entities.reverse()
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parser.entities.sort(key=lambda entity: entity.offset)
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return del_surrogate(text), parser.entities
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@staticmethod
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def unparse(text: str, entities: Iterable[TypeMessageEntity]) -> str:
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"""
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Performs the reverse operation to .parse(), effectively returning HTML
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given a normal text and its MessageEntity's.
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:param text: the text to be reconverted into HTML.
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:param entities: the MessageEntity's applied to the text.
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:return: a HTML representation of the combination of both inputs.
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"""
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if not text:
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return text
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elif not entities:
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return escape(text)
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if isinstance(entities, TLObject):
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entities = (entities,) # type: ignore
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text = add_surrogate(text)
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insert_at = []
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for i, entity in enumerate(entities):
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s = entity.offset
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e = entity.offset + entity.length
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delimiter = ENTITY_TO_FORMATTER.get(type(entity), None) # type: ignore
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if delimiter:
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if callable(delimiter):
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delimiter = delimiter(entity, text[s:e])
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insert_at.append((s, i, delimiter[0]))
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insert_at.append((e, -i, delimiter[1]))
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insert_at.sort(key=lambda t: (t[0], t[1]))
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next_escape_bound = len(text)
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while insert_at:
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# Same logic as markdown.py
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at, _, what = insert_at.pop()
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while within_surrogate(text, at):
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at += 1
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text = text[:at] + what + escape(text[at:next_escape_bound]) + text[next_escape_bound:]
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next_escape_bound = at
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text = escape(text[:next_escape_bound]) + text[next_escape_bound:]
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return del_surrogate(text)
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```
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</details>
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