Context data needed in custom renderer

[juanitocalero]

I'm writing a custom renderer, and I would like to modify my generated img tags to customize its url with a prefix.

That prefix depends on some extra data that depends on the current execution, but I'm unable to find a way to insert a context object in my custom render methods.

I know I could add an external prepopulated state object, but following the code, I can't find a way for that state to reach the rendering methods. The method's signature doesn't include a state. I've reviewed renderers/html.py render_token method, and it seems that the state is never used in the render functions.

How could I achieve that? The options that come to my mind are:

• Add a property to my custom renderer class that changes before each invocation, but this could cause problems in case of multithreaded use and feels kinda ugly. I colud recreate the mistune object and/or the renderer in each invocation with my custom data, but I was looking for a better option.
• Override the renderer core methods and call the render functions with the state included, but it seems like a lot of work and prone to errors.

Any ideas?