counting the commented lines using awk [ /* */]

itsjvivek · 01-10-2003, 11:29 PM

Hello Everybody

I am writing a shell script to count the lines of code in a c program

I am able to find out the single comment lines

i am facing problem when i try to find out the multiple comment lines

EX:

/* This is a
multi line comment
by the author */

could anyout there give me the awk script for this particular
matching

Thankz in advance

moses · 01-11-2003, 12:18 AM

What have you got so far?

itsjvivek · 01-11-2003, 03:08 AM

I am able to find the comment lines

1. starting with [ // ]
2. single line comments [ /* asdadfadf */ ]

I am clueless about find the multi line comments

/* adfasdf
asdfasdf
asdfasdf
sdfasdf */

moses · 01-11-2003, 10:38 AM

Post your code. . .

itsjvivek · 01-13-2003, 06:43 AM

#!/bin/bash

##################################
# Getting The User Input
##################################

echo "Enter The Source Directory Path"
echo "Ex : /carina/tools/src"
read SRC_PATH
#SRC_PATH="/home/orbjvi/cnt"
#SRC_PATH="/home/orbjvi/as400-test/secrvr"

##################################
# Validating The User Input
##################################

if test -z $SRC_PATH
then
echo "Path Not Entered!!!"
echo "Quitting..."
exit
else
if test -d $SRC_PATH
then
#echo "Do You Want To Scan Recursively?[Y/N]"
#read RECURSION
#if [ $RECURSION = y -o $RECURSION = Y -o $RECURSION = yes -o $RECURSION = YES -o $RECURSION = Yes ]
# then
# SEARCH="find $SRC_PATH
echo "Starting...."
echo
#echo
#echo
#fi
else
echo "Path Not Valid!!!"
echo "Quitting..."
exit
fi
fi

##################################
# Checking For Blank Lines
##################################

for Filename in $(find $SRC_PATH -iname "*.c")
do
echo Checking `basename $Filename`

awk 'BEGIN { }

NF > 0 { ++TOTAL }
/^$/ { ++BLANK }
/\/\// { ++SLASH }
/\/\*/ { ++MULTI }

# Similarly i want to find
# multiline comments

END {
printf("TOTAL = %4d\n" , TOTAL);
printf("BLANKS = %4d\n" , BLANK);
printf("SINGLES = %4d\n" , SLASH);
printf("COMMENT1 = %4d\n" , MULTI);
printf("\n");
} ' $Filename

done

moses · 01-15-2003, 02:40 AM

There are programs available, but. . .

I would imagine that a way to do this (I haven't done it, but I've
got ideas) would be to keep an eye out for the begin multi-line
comment (/*), and hop in to a while loop, during which you look for
new lines (\n) and increment. The while loop will terminate
when you come to an end multi-line comment (*/).

itsjvivek · 01-15-2003, 06:45 AM

Thanks moses

even i was having the same idea

but since i am just one week new to shell script , i am finding
it difficult to implement in code

if you could get it in code .. just give me

or please give me links where any sample code coulde be available

Thanks in advance

moses · 01-17-2003, 08:03 AM

Ok, Here's my little awk script (on its own, you'll have to modify it
somewhat to incorporate it into yours):

Code:

awk -F"\n"  
'BEGIN
{RS=/\/\*/}
{RT=/\*\//} 
{++MULTI} 
END 
{print MULTI}'

commented code:

Code:

awk
'BEGIN
{FS="\n"}    # set the field separator to be a newline
{RS=/\/\*/}   # set the Record separator to be the begin multiline comment 
{RT=/\*\//}   # set the Record terminator to be the end multiline comment
{++MULTI}
END 
{print MULTI}'

Try this out, for more help read the awk man page. . .
[edit]:
Actually, there is a bug in here, but I haven't found it (them?) yet.

moses · 01-17-2003, 08:30 AM

Here is a fixed version. I'm leaving the other one up there so
someone who knows more can look at it and tell me what's wrong
with it, if they care to. . .

Code:

awk '/\/\*/,/\*\//   # Set the range pattern to be that of a multiline comment
{++MULTI}  # Increment the multiline counter
END 
{print MULTI}'

Again, the man page is your friend. . .