tree 3e9f1bf49e8aa244e5e7e1a3516ce338103c4bb6
parent 81cf95e9964a232f5902d48645bfea487093d3ef
author Natalie Weizenbaum <nweiz@google.com> 1447805036 -0800
committer Natalie Weizenbaum <nweiz@google.com> 1447805036 -0800

Optimize absolute() and normalize().

This short-circuits absolute() if the path is already absolute.
Detecting absolute paths is very fast, whereas join() is relatively
slow.

For normalize(), this runs a single-pass check over a path to see
whether it needs to be normalized at all. This check isn't free, but
it's a lot less costly than parsing and reserializing the path, and it
covers the common case.

See dart-lang/glob#24962

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1455003002 .