Problem with rendering Sphinx substitutions in HTTPDomain extension

[bomb-on]

@dahlia (or anyone else who can help)
I am trying to use your extension (sphinxcontrib.httpdomain) in my project and I defined my 'routing table' like this:

# conf.py
from sphinx.domains.std import StandardDomain

def setup(app):
    StandardDomain.initial_data['labels']['routingtable'] = (
        'http-routingtable',
        '',
        'HTTP Routing Table')
    StandardDomain.initial_data['anonlabels']['routingtable'] = (
        'http-routingtable',
        '')

I also defined few simple substitutions which I use throughout my docs, e.g.:

# conf.py
rst_epilog = """
.. |mongodb_icon| raw:: html

   <span class="icon-dbs-mongodb"></span>
"""

When I put this substitution in the synopsis directive, it is rendered out on the 'routing table' page as plain text (e.g. |mongodb_icon| instead of <span class="icon-dbs-mongodb"></span>):

# in some .rst file
.. http:post:: /companies/
   :synopsis: Some text whatever |mongodb_icon|

Is it possible to 'force' this page (routing table) to render out my substitutions properly?

[bomb-on]

I tried to play around with a "fix" for this and I found that problem lies in generate(), specifically line 336:

    def generate(self, docnames=None):
        content = {}
        items = ((method, path, info)
            for method, routes in self.domain.routes.iteritems()
            for path, info in routes.iteritems())
        items = sorted(items, key=lambda item: item[1])
        for method, path, info in items:
            entries = content.setdefault(self.grouping_prefix(path), [])
            entries.append([
                method.upper() + ' ' + path, 0, info[0],
                http_resource_anchor(method, path), '', '', info[1]  # info[1] renders out substitution as plain text
            ])
        content = content.items()
        content.sort(key=lambda (k, v): k)
        return (content, True)

What I tried is instead of using info[1] to figure out if there is a substitution defined for this particular string and replace it, something like:

    def generate(self, docnames=None):
        content = {}
        items = ((method, path, info)
                 for method, routes in self.domain.routes.items()
                 for path, info in routes.items())
        items = sorted(items, key=lambda item: item[1])
        for method, path, info in items:
            # check if there are any substitutions machin ones defined in `rst_epilog` and replace them
            substitution = re.search('(\|(.*)\|)', info[1])
            if substitution:
                replacement = re.search(substitution.group(0), self.domain.env.config.rst_epilog)
                if replacement:
                    sub_parsed = self.domain.env.config.rst_epilog.split(substitution.group(0))[1].split('\n')[2].strip()
                    parsed_line = info[1].replace(substitution.group(0), sub_parsed)
            else:
                parsed_line = info[1]
            entries = content.setdefault(self.grouping_prefix(path), [])
            entries.append([
                method.upper() + ' ' + path, 0, info[0],
                http_resource_anchor(method, path),
                '', 'Deprecated' if info[2] else '', parsed_line
            ])
        items = sorted(
            (path, sort_by_method(entries))
            for path, entries in content.items()
        )
        return (items, True)

This does replace the substitution with (in my case) proper HTML - instead of |mongodb_icon|, parsed_line is now <span class="icon-dbs-mongodb"></span>.
However, visiting the "routing table" page wraps this particular string into <em></em> block and therefore I end up with escaped HTML on the page instead of showing the icon itself.