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POMethod to strip C comments from patch files
 

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  1. POMethod to strip C comments from patch files
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    <p>I'm looking at trying to strip out C comments from our patch files and have looked at numerous regexes, but if we remove lines from our patches - it would break them.</p> <p>How would you write a regex or sed command to search diff patch files for comments and replace comment lines with blank spaces. </p> <p>This works sed regex works for C files, but for patches I need something different:</p> <pre><code>sed '/^\/\*/,/\*\//d' </code></pre> <p>An example patch exerpt would be:</p> <pre><code>@@ -382,7 +391,109 @@ return len; } +/********************************************************************************** + * Some patch + * Author: Mcdoomington + * Do somethimg + * + * fix me + **********************************************************************************/ </code></pre> <p>Anyone have ideas?</p> <p>Edit:</p> <p>Using this filter:</p> <pre><code>sed -e 's,^+ \*.*,+ \/\/Comment removed,' mypatch.patch &gt; output +/********************************************************************************** + //Comment removed + //Comment removed + //Comment removed </code></pre> <p>How do I add a if line ends with \ to skip it?</p> <p>Edit: Solution </p> <p>While not the cleanest way - I used sed with a jury-rigged regex.</p> <pre><code>sed -e '/[^\*\/]$/{N;s,^+ \* .*,+ \* Comment removed,;}' patch &gt; output sed -e '/[^\*\/]$/{N;s,^+\\\* .*,+ \/\* Comment removed,;}' patch &gt; output </code></pre> <p>Note the second command can be a bit too greedy, but for the purposes of sanitizing comments - this works!</p> <p>How it works:</p> <p>1.) First command To determine if this is the end of a comment /[^*/]$/ determines if it is <em>/ then {N;s,^+\* .</em>,+ /* Comment removed,;}' finds +* (whatever) and replaces it with * Comment removed. </p> <p>2.) Second command To determine if this is the end of a comment /[^*/]$/ determines if it is <em>/ then {N;s,^+\* .</em>,+ /* Comment removed,;}' finds + * (whatever) and replaces it with * Comment removed. </p>
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    1. USmcdoomington
    1. USmcdoomington
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    1. COAre the patch files incoming, or are you generating them? Is it all comments that you want to move, or just block comments between functions?
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      1. USJonathan Leffler
    2. COThe patch files have been already created and I was looking for an easy way to remove the comments or at least blank them out. Creating new patches is a huge task due to the staging environment and they number about 30+.
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      1. USmcdoomington
    3. COThere's a point where regexes simply aren't smart or flexible enough to do what you want; this is one of those cases. You need to be able to recognize `/*`, `*/`, and `//` tokens and parse the file accordingly. Personally, I'd just hand-hack my own filter for a job like this; shouldn't take more than a couple of hours.
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      1. USJohn Bode
 

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