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def _apply_entities(text, entities, escape_map, format_map):
def inside_entities(i):
return any(map(lambda e:
e['offset'] <= i < e['offset']+e['length'],
entities))
# Split string into char sequence and escape in-place to
# preserve index positions.
seq = list(map(lambda c,i:
escape_map[c] # escape special characters
if c in escape_map and not inside_entities(i)
else c,
list(text), # split string to char sequence
range(0,len(text)))) # along with each char's index
# Ensure smaller offsets come first
sorted_entities = sorted(entities, key=lambda e: e['offset'])
offset = 0
result = ''
for e in sorted_entities:
f,n,t = e['offset'], e['length'], e['type']
result += ''.join(seq[offset:f])
if t in format_map:
# apply format
result += format_map[t](''.join(seq[f:f+n]), e)
else:
result += ''.join(seq[f:f+n])
offset = f + n
result += ''.join(seq[offset:])
return result
def apply_entities_as_markdown(text, entities):
"""
Format text as Markdown. Also take care of escaping special characters.
Returned value can be passed to :meth:`.Bot.sendMessage` with appropriate
``parse_mode``.
:param text:
plain text
:param entities:
a list of `MessageEntity <https://core.telegram.org/bots/api#messageentity>`_ objects
"""
escapes = {'*': '\\*',
'_': '\\_',
'[': '\\[',
'`': '\\`',}
formatters = {'bold': lambda s,e: '*'+s+'*',
'italic': lambda s,e: '_'+s+'_',
'text_link': lambda s,e: '['+s+']('+e['url']+')',
'text_mention': lambda s,e: '['+s+'](tg://user?id='+str(e['user']['id'])+')',
'code': lambda s,e: '`'+s+'`',
'pre': lambda s,e: '```text\n'+s+'```'}
return _apply_entities(text, entities, escapes, formatters)
def apply_entities_as_html(text, entities):
"""
Format text as HTML. Also take care of escaping special characters.
Returned value can be passed to :meth:`.Bot.sendMessage` with appropriate
``parse_mode``.
:param text:
plain text
:param entities:
a list of `MessageEntity <https://core.telegram.org/bots/api#messageentity>`_ objects
"""
escapes = {'<': '<',
'>': '>',
'&': '&',}
formatters = {'bold': lambda s,e: '<b>'+s+'</b>',
'italic': lambda s,e: '<i>'+s+'</i>',
'text_link': lambda s,e: '<a href="'+e['url']+'">'+s+'</a>',
'text_mention': lambda s,e: '<a href="tg://user?id='+str(e['user']['id'])+'">'+s+'</a>',
'code': lambda s,e: '<code>'+s+'</code>',
'pre': lambda s,e: '<pre>'+s+'</pre>'}
return _apply_entities(text, entities, escapes, formatters)
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