How to remove newline, tab, spaces in curly braces.. :( Pls Help?

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10-01-2014

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How to remove newline, tab, spaces in curly braces.. :( Pls Help?

Hi Everyone,

in the below "xyz (Exception e)" part... after the curly braces, there is a new line and immediately few tabs are present before closing curly brace.

Code:

xyz (Exception e) { 

}

note: there can be one or more newlines between the curly braces.

My desired output should be

Code:

xyz (Exception e) {}

Have tried a lot using awk, sed etc.. but no use. Please help asap. Thank you so much.

Reg,
NY

Last edited by Don Cragun; 10-01-2014 at 05:28 AM.. Reason: Add CODE tags.

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There are a lot of things that aren't specified in your requirements. Making lots of wild assumptions, the following might be something you can use:

Code:

awk '
/{/,/}/ {
	if(sub("{.*$", "{}")) print
	next
}
1' file

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk.

If file contains:

Code:

xyz (Exception e) { 

}

Free text

abc (int c) {
	garbage
	garbage
	garbage
		}
free text 2

single (line test) {     	}
after single line

the above code produces the output:

Code:

xyz (Exception e) {}

Free text

abc (int c) {}
free text 2

single (line test) {}
after single line

Don Cragun

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Thank yo Mr. Cragun for the fast reply. Let me explain you completely.. My file contain multiple exceptions. For instance, see the below 3.

1.

Code:

xyz (Exception) {
                                                                                                         }

2.

Code:

xyz (Exception) {


                                                  }

3.

Code:

xyz (Exception) { 
                                            filhfs ijsdlfh sdlfhl }

In the above three different scenarios, no change required for 3rd scenario as there is data between curly braces.

I need the 1st & 2nd scenario to be handled as there is no data between curly braces and also, if there is space/tab exists in between the braces then it should be removed..
The output for the both 1st and 2nd scenarios should be same. I.e,

Code:

xyz (Exception) {}

Moderator's Comments:

Mod Comment

Please use CODE tags for sample input, sample output, and code segments as required by forum rules.

Thank you so much.

Last edited by Don Cragun; 10-01-2014 at 06:48 AM.. Reason: Add CODE tags.

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So, apparently you want something more like:

Code:

awk '
/{/,/}/ {
	if(/{/)	o = $0
	else	o = o "\n" $0
	if(/}/)	{
		sub(/{[ \t\n]*}/, "{}", o)
		print o
	}
	next
}
1' file

which with the input I showed earlier,produces the output:

Code:

xyz (Exception e) {}

Free text

abc (int c) {
	garbage
	garbage
	garbage
		}
free text 2

single (line test) {}
after single line

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How about

Code:

awk     '/{/    {while (!(/}/)) {getline X; $0 = $0 X}
                 sub (/{[       ]*/,"{")
                 sub (/[        ]*}/, "}")
                }
         1
        ' file
xyz (Exception) {}


xyz (Exception) {}



xyz (Exception) {filhfs ijsdlfh sdlfhl}

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Thank you again for a so quick reply Mr. Cargun.

The solution given is not working as expected. For the better clarity, I am attaching the input and the desire output.

Please go through them once. Thank you so much.

regards,
NY

input.txt (536 Bytes)

desired_ouput.txt (475 Bytes)

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The "solution given is not working as expected" because you posted an inappropriate, truncated sample, and the files you are using are not *NIX standard text files (containing extra win* <CR> line terminating chars).
However, try (based on Don Cragun's proposal):

Code:

awk     '/([Ee]xcept.*) {/      {SV = $0; L=1; next}
         !L
         L                      {SV = SV RS $0
                                 if (/}/) {sub (/{[ \t\r\n]*}/, "{}", SV)
                                           print SV
                                           L=0
                                          }
                                }
        ' input.txt

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