Sith/core/markdown.py

# -*- coding:utf-8 -*
#
# Copyright 2016,2017
# - Skia <skia@libskia.so>
#
# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
# http://ae.utbm.fr.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License a published by the Free Software
# Foundation; either version 3 of the License, or (at your option) any later
# version.
#
# This program 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 General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
# Place - Suite 330, Boston, MA 02111-1307, USA.
#
#

import re
from mistune import Renderer, InlineGrammar, InlineLexer, Markdown, escape, escape_link
from django.core.urlresolvers import reverse


class SithRenderer(Renderer):
    def file_link(self, id, suffix):
        return reverse('core:file_detail', kwargs={'file_id': id}) + suffix

    def exposant(self, text):
        return """<sup>%s</sup>""" % text

    def indice(self, text):
        return """<sub>%s</sub>""" % text

    def underline(self, text):
        return """<u>%s</u>""" % text

    def image(self, original_src, title, text):
        """Rendering a image with title and text.
        :param src: source link of the image.
        :param title: title text of the image.
        :param text: alt text of the image.
        """
        style = None
        if '?' in original_src:
            src, params = original_src.rsplit('?', maxsplit=1)
            m = re.search(r'(\d+%?)(x(\d+%?))?', params)
            if not m:
                src = original_src
            else:
                width = m.group(1)
                if not width.endswith('%'):
                    width += "px"
                style = "width: %s; " % width
                try:
                    height = m.group(3)
                    if not height.endswith('%'):
                        height += "px"
                    style += "height: %s; " % height
                except:
                    pass
        else:
            params = None
            src = original_src
        src = escape_link(src)
        text = escape(text, quote=True)
        if title:
            title = escape(title, quote=True)
            html = '<img src="%s" alt="%s" title="%s"' % (src, text, title)
        else:
            html = '<img src="%s" alt="%s"' % (src, text)
        if style:
            html = '%s style="%s"' % (html, style)
        if self.options.get('use_xhtml'):
            return '%s />' % html
        return '%s>' % html


class SithInlineGrammar(InlineGrammar):
    double_emphasis = re.compile(
        r'^\*{2}([\s\S]+?)\*{2}(?!\*)'  # **word**
    )
    emphasis = re.compile(
        r'^\*((?:\*\*|[^\*])+?)\*(?!\*)'  # *word*
    )
    underline = re.compile(
        r'^_{2}([\s\S]+?)_{2}(?!_)'  # __word__
    )
    exposant = re.compile(
        r'^<sup>([\s\S]+?)</sup>'  # <sup>text</sup>
    )
    indice = re.compile(
        r'^<sub>([\s\S]+?)</sub>'  # <sub>text</sub>
    )


class SithInlineLexer(InlineLexer):
    grammar_class = SithInlineGrammar

    default_rules = [
        'escape',
        # 'inline_html',
        'autolink',
        'url',
        'footnote',
        'link',
        'reflink',
        'nolink',
        'exposant',
        'double_emphasis',
        'emphasis',
        'underline',
        'indice',
        'code',
        'linebreak',
        'strikethrough',
        'text',
    ]
    inline_html_rules = [
        'escape',
        'autolink',
        'url',
        'link',
        'reflink',
        'nolink',
        'exposant',
        'double_emphasis',
        'emphasis',
        'underline',
        'indice',
        'code',
        'linebreak',
        'strikethrough',
        'text',
    ]

    def output_underline(self, m):
        text = m.group(1)
        return self.renderer.underline(text)

    def output_exposant(self, m):
        text = m.group(1)
        return self.renderer.exposant(text)

    def output_indice(self, m):
        text = m.group(1)
        return self.renderer.indice(text)

    # Double emphasis rule changed
    def output_double_emphasis(self, m):
        text = m.group(1)
        text = self.output(text)
        return self.renderer.double_emphasis(text)

    # Emphasis rule changed
    def output_emphasis(self, m):
        text = m.group(1)
        text = self.output(text)
        return self.renderer.emphasis(text)

    def _process_link(self, m, link, title=None):
        try:  # Add page:// support for links
            page = re.compile(
                r'^page://(\S*)'                   # page://nom_de_ma_page
            )
            match = page.search(link)
            page = match.group(1) or ""
            link = reverse('core:page', kwargs={'page_name': page})
        except:
            pass
        try:  # Add file:// support for links
            file_link = re.compile(
                r'^file://(\d*)/?(\S*)?'                   # file://4000/download
            )
            match = file_link.search(link)
            id = match.group(1)
            suffix = match.group(2) or ""
            link = reverse('core:file_detail', kwargs={'file_id': id}) + suffix
        except:
            pass
        return super(SithInlineLexer, self)._process_link(m, link, title)


renderer = SithRenderer(escape=True)
inline = SithInlineLexer(renderer)

markdown = Markdown(renderer, inline=inline)

if __name__ == "__main__":
    print(markdown.inline.default_rules)
    print(markdown.inline.inline_html_rules)
    text = """
## Basique

* Mettre le texte en **gras** : `**texte**`

* Mettre le texte en *italique* : `*texte*`

* __Souligner__ le texte : `__texte__`

* ~~Barrer du texte~~ : `~~texte~~`

* Mettre ^du texte^ en ^exposant^ : `^mot` ou `^texte^`

* _Mettre du texte_ en _indice_ : `_mot` ou `_texte_`

* Pied de page [^en pied de page]

## Blocs de citations

Un bloc de citation se crée ainsi :
```
> Ceci est
> un bloc de
> citation
```

> Ceci est
> un bloc de
> citation

Il est possible d'intégrer de la syntaxe Markdown-AE dans un tel bloc.

Petit *test* _sur_ ^une^ **seule** ^ligne pour voir^

"""
    print(markdown(text))