Fixed false positive for "食べられる" (potential verb) by JapaneseBrokenExpression

[hirokiky]

JapaneseBrokenExpression would cause false positives for potential verb.
It would assert error for "食べられる", "見られる", "寝られる", and so on.

What I did:

• Added tests for checking this
• Fixed code (JapaneseBrokenExpression only).
• Added special case handling

About special case

The tokenizer will parse ”見れる" as one token.
It might depends on dicts of Kuromoji or so.

This issue looks similar takuyaa/kuromoji.js#28

I think we need to add other special cases (if there are).

About baseForm of tokens

It's better to use BaseForm in this logic

q.getSurface().startsWith("られ")

Best way.

q.getBaseForm().equals("られる")

But to get baseForm, we need to change TokenElement and NoelogdJapaneseTokenizer.
It looks other Validators won't use BaseForm of each tokens, and it's only necessary with Japanese.
So in this PullRequest, I avoided to change them.

As ScreenShot

Before

After

Note

I'm not good at Java, so feel free to change my code and syntax as you like.

[coveralls]

Coverage increased (+0.003%) to 91.41% when pulling 4ac46d3 on hirokiky:fix-jp-broken-ra into 4ea76e6 on redpen-cc:master.

[norm-ideal]

I am also working on the subject and I agree with you that the best way is to introduce BaseForm information, even though it is required only by Japanese. How about like this?

https://github.com/norm-ideal/redpen/tree/ra-drop

[takahi-i]

LGTM! Thank you very much for the valuable contribution @hirokiky 🙏

[hirokiky]

Thanks for the quick review!