Minimum Viable Grammar

[jacqueswww]

What I did

• Adds lark grammar for Vyper.
• Hooks grammar to be parsed for all get_contract_* function in testse.
• Adds wildcard hypothesis test.

How I did it

How to verify it

Description for the changelog

Cute Animal Picture

[fubuloubu]

This is seriously cool

[fubuloubu]

Unsure what the py36-core failure is. Does lark work with py36?

[lgtm-com]

This pull request introduces 1 alert when merging 8b5984d into e0bb58d - view on LGTM.com

new alerts:

• 1 for Implicit string concatenation in a list

[jacqueswww]

@fubuloubu I have setup a separate hypthesis test case.

[fubuloubu]

@jacqueswww can you call it "fuzzing" instead of "long_run_time"?

Also, the tests still take 8 mins...

[charles-cooper]

Seems this mainly fuzzes the grammar? Could you please update the PR description

[fubuloubu]

@charles-cooper correct. @jacqueswww created a vyper grammar from the python one, using the lark tool, and is using that to create a hypothesis strategy that generates source code which should be parseable by the grammar. If anything doesn't compile, the grammar is off; if anything does compile but crashes, we have an edge case in our grammar we are not handling appropiately.

[jacqueswww]

@charles-cooper Yeah so it's a fully fledged grammar now.
It started off fuzzing; but then also went further and proved that it can parse almost all of our tests (the ones that use get_contract functions) - which to me makes it a great 'official grammar' :o)

[jacqueswww]

@fubuloubu Alright I don't know why the tests are slower; but if you check the log output - you can clearly see hypthesis doesn't run anymore - so that's something.

[jacqueswww]

@fubuloubu figured it out 😸

[charles-cooper]

This is awesome. LGTM thanks!