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Top Forums UNIX for Dummies Questions & Answers Remove multi line and single line comments Post 302848279 by ahmedwaseem2000 on Thursday 29th of August 2013 12:49:23 AM
Old 08-29-2013
Remove multi line and single line comments

Hi,

I am trying to remove multi line and single line comments like examples below

Quote:
/* Comment 1 */
Some text here
/* COmment 2
spread across multi lines */
some more text
-- single line comments
I have tried this pattern. it works fine for single line comments and multi line comments in a single line only. but this fails when the comments are extended in multiple lines as shown in the comment 2 of the example.

can you please help me correct this pattern?

Quote:
sed -e '/^$/b' -e 's/\/\*[^\*\/]*\*\///g; /^$/d' -e 's/\(.*\)\(--\).*/\1/g' file name
Note: the above code also deletes empty lines
 

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MDOM::Token::Comment(3pm)				User Contributed Perl Documentation				 MDOM::Token::Comment(3pm)

NAME
MDOM::Token::Comment - A comment in Makefile source code INHERITANCE
MDOM::Token::Comment isa MDOM::Token isa MDOM::Element SYNOPSIS
# This is a MDOM::Token::Comment foo: bar # So is this one echo 'hello' DESCRIPTION
In MDOM, comments are represented by "MDOM::Token::Comment" objects. These come in two flavours, line comment and inline comments. A "line comment" is a comment that stands on its own line. These comments hold their own newline and whitespace (both leading and trailing) as part of the one "MDOM::Token::Comment" object. An inline comment is a comment that appears after some code, and continues to the end of the line. This does not include whitespace, and the terminating newlines is considered a separate MDOM::Token::Whitespace token. This is largely a convenience, simplifying a lot of normal code relating to the common things people do with comments. Most commonly, it means when you "prune" or "delete" a comment, a line comment disappears taking the entire line with it, and an inline comment is removed from the inside of the line, allowing the newline to drop back onto the end of the code, as you would expect. It also means you can move comments around in blocks much more easily. For now, this is a suitably handy way to do things. However, I do reserve the right to change my mind on this one if it gets dangerously anachronistic somewhere down the line. METHODS
Only very limited methods are available, beyond those provided by our parent MDOM::Token and MDOM::Element classes. line The "line" accessor returns true if the "MDOM::Token::Comment" is a line comment, or false if it is an inline comment. SUPPORT
See the support section in the main module. AUTHOR
Adam Kennedy <adamk@cpan.org> COPYRIGHT
Copyright 2001 - 2006 Adam Kennedy. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the license can be found in the LICENSE file included with this module. perl v5.12.4 2011-08-28 MDOM::Token::Comment(3pm)
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