<div class="gmail_quote">On Mon, Jan 23, 2012 at 12:18 PM, Kaelyn Uhrain <span dir="ltr"><<a href="mailto:rikka@google.com">rikka@google.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Author: rikka<br>
Date: Mon Jan 23 14:18:59 2012<br>
New Revision: 148720<br>
<br>
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=148720&view=rev" target="_blank">http://llvm.org/viewvc/llvm-project?rev=148720&view=rev</a><br>
Log:<br>
In CorrectTypo, use the cached correction as a starting point instead.<br>
<br>
Previously, for unqualified lookups, a positive cache hit is used as the<br>
only non-keyword correction and a negative cache hit immediately returns<br>
an empty TypoCorrection. With the new callback objects, this behavior<br>
causes false negatives by not accounting for the fact that callback<br>
objects alter the set of potential/allowed corrections. The new behavior<br>
is to seed the set of corrections with the cached correction (for<br>
positive hits) to estabilishing a baseline edit distance. Negative cache<br>
hits are only stored or used when either no callback object is provided<br>
or when it returns true for a call to ValidateCandidate with an empty<br>
TypoCorrection (i.e. when ValidateCandidate does not seem to be doing<br>
any checking of the TypoCorrection, such as when an instance of the base<br>
callback class is used solely to specify the set of keywords to be accepted).<br></blockquote><div><br></div><div>Is there any performance impact to this change? It seems like it would make the caching much less effective. Is that acceptable for all of the correction clients?</div>
</div>