All geek questions in one place

How to extract comment from header file using python, perl or sed?

I have a header file:

/*
 * APP 180-2 ALG-254/258/772 implementation
 * Last update: 03/01/2006
 * Issue date:  08/22/2004
 *
 * Copyright (C) 2006 Somebody Name here
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef HEADER_H
#define HEADER_H

/* More comments and C++ code here. */

#endif /* End of file. */

And I want to extract the contents of only the comment

 APP 180-2 ALG-254/258/772 implementation
 Last update: 03/01/2006
 Issue date:  08/22/2004

 Copyright (C) 2006 Somebody Name here
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 3. Neither the name of the project nor the names of its contributors
    may be used to endorse or promote products derived from this software
    without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

Please suggest an easy way to do this using Python, Perl, sed, or some other way on Unix. Preferably as a single line layer.

+3
source share
3 answers

This should work for you:

sed -n '/\*\//q; /^\/\*/d; s/^ \* \?//p' <file.h >comment.txt

Here's the explanation: sed (as you know) is a command that goes through a file, applying a list of rules to each line. Each rule consists of a “selector” and commands that apply to this line only if the selector matches.

/\*\//. ; , */. , . ( , .) q, "". sed . , -n, " , ".

/^\/\*/, , /* . , , . d sed .

, ( ). s/PATTERN/REPLACEMENT/, , . ^ \* \?, , 0 1 , . . , sed - ()? . p , sed . - -n.

+5

Pyparsing . cStyleComment scanString :

c_src = open(c_source_file).read()

from pyparsing import cStyleComment
cmt = cStyleComment.scanString(c_src).next()[0][0]
lines = [l[3:] for l in cmt.splitlines()]
print '\n'.join(lines)

scanString - , , . :

APP 180-2 ALG-254/258/772 implementation 
Last update: 03/01/2006 
Issue date:  08/22/2004 

Copyright (C) 2006 Somebody Name here 
All rights reserved. 

Redistribution and use in source and binary forms, with or without 
modification, are permitted provided that the following conditions 
are met: 
1. Redistributions of source code must retain the above copyright 
   notice, this list of conditions and the following disclaimer. 
2. Redistributions in binary form must reproduce the above copyright 
   notice, this list of conditions and the following disclaimer in the 
   documentation and/or other materials provided with the distribution. 
3. Neither the name of the project nor the names of its contributors 
   may be used to endorse or promote products derived from this software 
   without specific prior written permission. 

THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
SUCH DAMAGE.
+4
sed -i -r "s/[\/\ ]{1}\*[\/\ ]?//g" YOURFILENAME

This replaces the comments in your file, preserving the contents. This will change the YOURFILENAME file. If you do not want to remove -i from the string

-1
source

Source: https://habr.com/ru/post/1746704/

More articles:


All Articles