| commit | ec12754700c5635c916361c6cd95718f57a8f1c9 | [log] [tgz] |
|---|---|---|
| author | Rob Pike <r@golang.org> | Thu Sep 24 13:10:00 2015 -0700 |
| committer | Rob Pike <r@golang.org> | Fri Sep 25 21:46:13 2015 +0000 |
| tree | 8eda6631b35c06adbae8effa87d7b87e5398738e | |
| parent | dc6df1b07093ffa0568a581251e8ddd38f707ed6 [diff] |
bufio: fix scanning with a final empty token. The Scan function's interface to the split function was not sufficient to handle an empty final token in a pure function; state was required. This was ugly. We introduce a special error value that a split function can return that signals that this token is OK, but is the last one and scanning should stop immediately _after_ this token. The same effect could be achieved using the same trick (a special error value) and checking for that error after Scan finishes, but it's a little clumsy. Providing a published sentinel value in bufio is cleaner and means everyone can use the same trick. The result is an error-free scan. Rewrite the test (that was only barely working) to use the value and be more robust. Also write a new example showing how to do it. Fixes #11836 Change-Id: Iaae77d0f95b4a2efa0175ced94d93c66353079e8 Reviewed-on: https://go-review.googlesource.com/14924 Reviewed-by: Ian Lance Taylor <iant@golang.org>
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