Parsing and editing source code using bash-script

Question

I do have several source code files (.cpp) containing the following line:

other stuff
...
TRACE(arg1, arg2, ...);
...
other stuff

where arg1, arg2, ... denote arbitrary function call arguments separated by a comma and possibly preceded by a whitespace.

The goal is to parse each line in each source file in my project and remove the first argument (arg1) from the function call TRACE, such as

TRACE(arg2, arg3, ...);

Note that function TRACE can be preceded by an arbitrary number of whitespace and can itself contain the string TRACE such as

TRACE(0, TRACE_INFO, "Test ");
    TRACE(  0 , TRACE, 4,5 ,6);

Is there an easy way to do so ?

A test file test.cpp contains:

   TRACE( "I2Ccontrol::I2Ccontrol", TRACE_FATAL,0);

3 White spaces, no preceding lines no following lines

Jahid · Accepted Answer · 2015-07-09 18:04:26Z

3

Using sed with extended regex:

sed -r 's/(\bTRACE\()([^",]+,\s*|\s*"[^"]*"\s*,\s*)(.*\);)/\1\3/' file

To change the file in-place use sed --in-place -r ...

EDIT:

Testing input from comment:

echo '   TRACE( "I2Ccontrol::I2Ccontrol", TRACE_FATAL,0);' |sed -r 's/(\bTRACE\()([^",]+,\s*|\s*"[^"]*"\s*,\s*)(.*\);)/\1\3/'
#three white space before TRACE

Output:

   TRACE(TRACE_FATAL,0);

edited Jul 9, 2015 at 18:04

answered Jul 9, 2015 at 13:34

Jahid

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18 Comments

Eugeniu Rosca Over a year ago

Great. This solution supports even commas in the value of arg1.

Flo Ryan Over a year ago

Thanks a lot! will this also work (in place) for multiple files like: sed --in-place -r ... file1 file2 ... ?

Flo Ryan Over a year ago

But wont there be a whitespace left over after each bracket now ? Such as TRACE( arg2,...

Flo Ryan Over a year ago

True just consistency in coding style. I have one Issue left though: A function call could look like this: TRACE(0, TRACE_INFO, "Test ", ... This would not only remove the 0 but also arg2 in this case TRACE_INFO which is certainly a real issue

Flo Ryan Over a year ago

Doesn't work. Content of test.cpp: TRACE( "I2Ccontrol::I2Ccontrol", TRACE_FATAL,0); (preceeded with 3 whitespaces) The following command sed --in-place -r 's/(\bTRACE()([^",]+,\s*|\s*"[^"]*",\s*)(.*);)/\1\3/' test.cpp doesnt affect the file test.cpp at all

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