[GSoC][PATCHv2] userdiff: add builtin driver for kotlin language

From: Jaydeep P Das <jaydeepjd.8914@gmail.com>
Date: Mar 2, 2022, 06:45 UTC
Message-ID: <20220302064504.2651079-1-jaydeepjd.8914@gmail.com>
In-Reply-To: <20220301070226.2477769-1-jaydeepjd.8914@gmail.com>

Thanks for the review. Yes. As Johannes pointed out, the word_regex was very loose and did not properly tokenise the code.

I have fixed(and added tests) for the following things in this patch:

+= or -= is not split into + = or - = -a or +a is split into 2 tokens(for each)

Since kotlin supports `_` in between digits to improve readability, therefore numbers like `100_000` are single tokens and not broken up by the regex in this patch.

Kotlin also does not support octal literals, and so the regex does not attempt to find it.

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