Can we make parsers stateless?

[rcshubhadeep]

Right now Parser objects are stateful (in a sense that each obejct keep the parse tree internally and also the raw code and all, of the file / code string that it parsed last)

Questions

• Is it necessary to make them stateless (imagine creating a single parser and using it in parallel on multiple files using a thread or multi-process based architecture)

• If the answer to the above is Yes then how do we do that?

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This may need a significant re-design of tree-hugger works at the moment. So, if we do that we need to keep in mind that we must not break backward compatibility.