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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/109991/">http://git.reviewboard.kde.org/r/109991/</a>
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<p style="margin-top: 0;">On April 17th, 2013, 1:50 a.m. UTC, <b>Simeon Bird</b> wrote:</p>
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<a href="http://git.reviewboard.kde.org/r/109991/diff/1/?file=138503#file138503line97" style="color: black; font-weight: bold; text-decoration: underline;">common/regexpcache.cpp</a>
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(Diff revision 1)
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">m_regexpCacheOptimized</span> <span class="o">=</span> <span class="n">QRegExp</span><span class="p">(</span> <span class="n">QString</span><span class="p">(</span> <span class="p">(</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="p">)</span><span class="mi">0</span> <span class="p">)</span> <span class="p">);</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Why not just QString()?</pre>
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<p>On April 18th, 2013, 4:55 p.m. UTC, <b>Lukasz Olender</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I tried to create more self-describing code, which tells that regexp will be empty, but I'm not really sure about it - should I put just QString()?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Yes - it is much clearer C++ idiom. Maybe if you were writing C you would put (const char *) NULL, but it's not really appropriate here. It is understood that QString() is empty.</pre>
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<p style="margin-top: 0;">On April 17th, 2013, 1:50 a.m. UTC, <b>Simeon Bird</b> wrote:</p>
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<a href="http://git.reviewboard.kde.org/r/109991/diff/1/?file=138503#file138503line199" style="color: black; font-weight: bold; text-decoration: underline;">common/regexpcache.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="n">QStringList</span> <span class="n">RegExpCache</span><span class="o">::</span><span class="n">splitString</span><span class="p">(</span> <span class="k">const</span> <span class="n">QString</span><span class="o">&</span> <span class="n">str</span> <span class="p">)</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Why don't you use QString::split?</pre>
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<p>On April 18th, 2013, 4:55 p.m. UTC, <b>Lukasz Olender</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I've added comment.</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Right...but I think you should use this function:
QStringList QString::split ( const QRegExp & rx, SplitBehavior behavior = KeepEmptyParts ) const
with a regex that means "split on any character NOT []\"
(I can't remember offhand what that looks like in regex, but you can look it up).</pre>
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<p style="margin-top: 0;">On April 17th, 2013, 1:50 a.m. UTC, <b>Simeon Bird</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Thanks for the patch! Please could you add a few comments on the design of the optimised regexp, why it is faster, how it works, and so on? It really helps us to review it faster.
Also, could you please add the test cases you link to the nepomuk tests directory? If you like, submit a separate patch adding them, as a test for regexp speed and correctness would be useful in itself.
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<p>On April 18th, 2013, 4:55 p.m. UTC, <b>Lukasz Olender</b> wrote:</p>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Yes. I'll make an another patch when review of this will be finished. Thanks for response!</pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">You're welcome - actually though it would be really good if you could post the testcase patch now - I wanted to run the test for review of this patch.</pre>
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<p>- Simeon</p>
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<p>On April 18th, 2013, 4:27 p.m. UTC, Lukasz Olender wrote:</p>
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<div>Review request for Nepomuk and Vishesh Handa.</div>
<div>By Lukasz Olender.</div>
<p style="color: grey;"><i>Updated April 18, 2013, 4:27 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It's related with https://bugs.kde.org/show_bug.cgi?id=303654.
P.S. I accidentally deleted author's and license info in patch. Isolated performance tests are also uploaded to http://www.sendspace.com/file/mkihdp (previous link not always work). It's my first patch.</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=303654">303654</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>common/regexpcache.h <span style="color: grey">(d89f968)</span></li>
<li>common/regexpcache.cpp <span style="color: grey">(df45277)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/109991/diff/" style="margin-left: 3em;">View Diff</a></p>
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