There is no such plugin as far as I know.
For your code files you can see the structure in Go to Symbol menu (CMD+R on OSX) if the files are supported by Sublime Text. SublimeCodeIntel provides "code intel" support for many programming languages.
Sublime Text did not have a decent .RST structure parser last time I checked few months ago, but I would be really grateful if someone creates such plugin (willing to donate).
You can create syntax colorizer with the base Sublime Text (no Python coding needed), but for language analysis a full fetched plugin is required. I suggest you open another question for how to write such plugins.