commit aa0abb94ff46e28b12245f75c35f7b248e173c88
author Noriyuki Takahashi <noriyukit@google.com> Sun Jan 25 06:37:36 2015 +0000
committer Yohei Yukawa <yukawa@google.com> Sun Jan 25 06:37:36 2015 +0000
tree 10455fe8750f2fac359635af1cf5762562c96926
parent 0f8b0e76e7a59b78e2033bfcc1941d0055e2ec1e

Make the conditions to learn candidates with a punctuation mark more strict

Learning a candidate with a punctuation was originally introduced for the desktop users so that sentence like suggestions such as "いつもお世話になっております" can be learned with punctuation marks like "。".  However, especially in mobile where zero query suggestions are suggested aggressively, the current algorithm is sometimes too aggressive in practice.

To reduce the risk of polluting history entries, this CL imposes some condition on the history candidate to check if it is a sentence or not.  Currently the candidate is handles as "sentence-like" when all the following conditions are met.
- the reading character length is 8 or greater.
- the word ends with Hiragana character.

Closes Issue 275.

BUG=Issue mozc:275
TEST=unittest

git-svn-id: https://mozc.googlecode.com/svn/trunk@501 a6090854-d499-a067-5803-1114d4e51264