anjiro has asked for the wisdom of the Perl Monks concerning the following question:
I've been trying to modify the classic perlfaq 6 regex for removing C-style comments. For reference, that regex is:
The regex as is removes comments but preserves newlines, so if you have:s#/\*[^*]*\*+([^/*][^*]*\*+)*/|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"' +\\]*)#defined $2 ? $2 : ""#gse;
you get:/* I have good commenting style */ i = 1; /* And I comment every line of code */ i++; /* Even if it's pointless */ j = i; j++;
when really I want:i = 1; i++; j = i; j++;
I tried modifying the regex to add a \n, which almost works (just before the first |):i = 1; i++; j = i; j++;
but when comments are indented it doesn't kill the whitespace at the start of the line:s#/\*[^*]*\*+([^/*][^*]*\*+)*/\n|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/ +"'\\]*)#defined $2 ? $2 : ""#gse;
Result:void function foo(void) { /*Indented comment*/ i = 1; }
I've tried adding a \s* at the front of the regex, but that doesn't seem to catch it. I've also tried some more complicated things without luck. Any regex wizard monks out there care to give it a try? Here's a final piece of commented code with the desired result:void function foo(void) { i = 1; }
Desired result:/*This is a bogus function*/ void function foo(void) /*My function is the best*/ { int i; /*i is an integer*/ int j; /*j is also an integer*/ /*Now I'm going to set i to 1*/ i = 1; /*Also j*/ j = 1; /*Here's some incrementing!*/ i++; /*And more!*/ j++; /*The end!*/}
void function foo(void) { int i; int j; i = 1; j = 1; i++; j++; }
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Replies are listed 'Best First'. | |
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Re: Modify C comment removal code to kill newlines
by marto (Cardinal) on Aug 21, 2006 at 13:21 UTC | |
Re: Modify C comment removal code to kill newlines
by borisz (Canon) on Aug 21, 2006 at 14:03 UTC | |
by anjiro (Beadle) on Aug 21, 2006 at 14:32 UTC | |
by borisz (Canon) on Aug 21, 2006 at 15:37 UTC | |
by anjiro (Beadle) on Aug 21, 2006 at 17:24 UTC | |
Re: Modify C comment removal code to kill newlines
by Velaki (Chaplain) on Aug 21, 2006 at 13:48 UTC | |
by anjiro (Beadle) on Aug 21, 2006 at 14:39 UTC | |
Re: Modify C comment removal code to kill newlines (non-nl-ws)
by tye (Sage) on Aug 21, 2006 at 14:02 UTC |
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