Emoji Grammar

[sh4nks]

Hey,

I have been trying to add a 'emoji' grammar to mistune but unfortunately I have been not so successful and have already spent more time on it than I'd like to admit. I am not that experienced with regex'es so there might be something wrong with mine but I just can't figure out what. The problem is, that mistune will only match the first pattern (like, literally the first in a block) and every emoji pattern after the first match is handled as a normal text. This is the code I've come up with:

import re
import mistune

class EmojiRenderer(object):
    def emoji(self, text):
        return "<emoji>%s</emoji>" % text


class EmojiInlineLexer(mistune.InlineLexer):
    def __init__(self, **kwargs):
        super(EmojiInlineLexer, self).__init__(**kwargs)
        self.default_rules.insert(0, "emoji")
        self.rules.emoji = re.compile(r'^:([a-zA-Z0-9\+\-_]+):', re.I)

    def output_emoji(self, m):
        text = self.output(m.group(1))
        return self.renderer.emoji(text)


class MarkdownRenderer(mistune.Renderer, EmojiRenderer):
    def __init__(self, **kwargs):
        super(MarkdownRenderer, self).__init__(**kwargs)


renderer = MarkdownRenderer()
inline = EmojiInlineLexer(renderer=renderer)
markdown = mistune.Markdown(renderer=renderer, inline=inline)
demo_text = """
:thumbs_up: *this works*

this doesn't work :thumbs_down:

:smile: :cry:
"""
print(markdown(demo_text))

and this is the output:

<p><emoji>thumbs_up</emoji> <em>this works</em></p>
<p>this doesn't work :thumbs_down:</p>
<p><emoji>smile</emoji> :cry:</p>

I would really appreciate any input/help.