Geek asks and answers

Jinja2 filter for converting custom markup to html

Having the autoescape property (I want to save it this way), I want the user to be able to enter some special markup to be able to format the text. For example, [s][/s]will be translated to <strong></strong>. I believe the right way to do this is to write a custom Jinja2 filter. But the following does not work:

@app.template_filter()
@evalcontextfilter
def mark2html(eval_ctx, value):
    result = escape(value).replace('[s]','<strong>')
    if eval_ctx.autoescape:
        result = Markup(result)
    return result

When applied to text type

<div>{{ custom_markup_text|mark2html }}</div>

When [s]found in a string stored in custom_markup_text , it should be converted to a tag <strong>. The AFAIK function, Markup () ensures that we trust this particular line so that HTML is not deleted there. The filter is successfully applied, [s]replaced by <strong>, but it is still shielded.

Obviously, auto-protection is performed after this custom filter. On the other hand, the filter example from the Jinja2 documentation works fine:

@app.template_filter()
@evalcontextfilter
def nl2br(eval_ctx, value):
    result = u'\n\n'.join(u'<p>%s</p>' % p.replace('\n', '<br>\n') \
        for p in _paragraph_re.split(escape(value)))
    if eval_ctx.autoescape:
        result = Markup(result)
    return result

What am I doing wrong?

+4
source share
1 answer

Task found. He doubles the line out - pretty stupid. This code works flawlessly:

@app.template_filter()
@evalcontextfilter
def mark2html(eval_ctx, value):
    result = value.replace('[s]',u'<strong>')
    result = result.replace('[/s]',u'</strong>')
    if eval_ctx.autoescape:
        result = Markup(result)
    return result

. , autoescape .

+1

More articles:


All Articles