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Removing comments from LUA scripts

sjcomp
New User

Feb 1, 2008, 2:38 PM

Post #1 of 3 (1444 views)

Removing comments from LUA scripts	Can't Post

I'd like to remove all the comments from a lua script. There are one line comments marked with double dashes. And block comments that start with double dashes followed by double left square brackets and end with double right square brackets.

Code

-- This is a comment. 
a = 3; -- This is a comment. 
a = 4; --[[ This is  
a  
block 
comment 
]]

I can remove single line comments by doing:

Code

$_ =~ s/--[^\n]*\n//;

How do I detect beginning of the block comment though?

Thanks.
Regards, Alexander. http://sjcomp.com

KevinR
Veteran

Feb 1, 2008, 3:01 PM

Post #2 of 3 (1440 views)

Re: [sjcomp] Removing comments from LUA scripts [In reply to]	Can't Post

do you have it all in one string or are you processing a file line by line?
-------------------------------------------------

sjcomp
New User

Feb 1, 2008, 3:08 PM

Post #3 of 3 (1439 views)

Re: [KevinR] Removing comments from LUA scripts [In reply to]	Can't Post

In Reply To

do you have it all in one string or are you processing a file line by line?

A the moment I read file line by line:

Code

while(<>) 
{ 
$_ =~ s/--[^\n]*\n//; 
}

I can change how it's done. I suppose it should be easier to get rid of the block comments if I put all the lines into one string and then process it:

Code

str = ""; 
while(<>) 
{ 
str = str + $_; 
} 
str =~ s/--[^\n]*\n//g; 
print str;

Thanks.
Regards, Alexander. http://sjcomp.com

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