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Top Forums Shell Programming and Scripting Awk: Dealing with whitespace in associative array indicies Post 302942745 by Michael Stora on Friday 1st of May 2015 12:51:11 AM
Old 05-01-2015
Quote:
Originally Posted by Chubler_XL
Code:
$ echo | awk 'BEGIN { a[contains whitespace]="abc"; if (contains purplespace in a) print "index exists"}'
index exists FALSE POSITIVE

This is not a false positive you are concatenating two null variables producing a null value just like:
contains whitespace == contains purplespace

Consider:

Code:
echo | awk 'BEGIN { whitespace="ws"; purplespace="ps"; a[contains whitespace]="abc"; if (contains purplespace in a) print "index exists"}'

I meant false positive in the sense of what I am trying to do, not in the sense of "hey, I found a bug in AWK!". I was just showing trying all possible combinations with and without quoting. I realized that it was parsing them as variables.

The problem is the existence of white space in the variables and I'm asking what is the most elegant way to deal with white space in an array index.

The best I can come up with is to remove the whitespace before the array assignment and the contains check
Code:
$ echo x," contains whitespace ",z | awk -F, 'NR==1 { i=$1$2$3; print i; gsub ( " ", "", i ); print i }'
x contains whitespace z
xcontainswhitespacez

Mike

Last edited by Michael Stora; 05-01-2015 at 05:02 AM..
 

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

NAME
MDOM::Token::Whitespace - Tokens representing ordinary white space INHERITANCE
MDOM::Token::Whitespace isa MDOM::Token isa MDOM::Element DESCRIPTION
As a full "round-trip" parser, MDOM records every last byte in a file and ensure that it is included in the MDOM::Document object. This even includes whitespace. In fact, Perl documents are seen as "floating in a sea of whitespace", and thus any document will contain vast quantities of "MDOM::Token::Whitespace" objects. For the most part, you shouldn't notice them. Or at least, you shouldn't have to notice them. This means doing things like consistently using the "S for significant" series of MDOM::Node and MDOM::Element methods to do things. If you want the nth child element, you should be using "schild" rather than "child", and likewise "snext_sibling", "sprevious_sibling", and so on and so forth. METHODS
Again, for the most part you should really not need to do anything very significant with whitespace. But there are a couple of convenience methods provided, beyond those provided by the parent MDOM::Token and MDOM::Element classes. null Because MDOM sees documents as sitting on a sort of substrate made of whitespace, there are a couple of corner cases that get particularly nasty if they don't find whitespace in certain places. Imagine walking down the beach to go into the ocean, and then quite unexpectedly falling off the side of the planet. Well it's somewhat equivalent to that, including the whole screaming death bit. The "null" method is a convenience provided to get some internals out of some of these corner cases. Specifically it create a whitespace token that represents nothing, or at least the null string ''. It's a handy way to have some "whitespace" right where you need it, without having to have any actual characters. tidy "tidy" is a convenience method for removing unneeded whitespace. Specifically, it removes any whitespace from the end of a line. Note that this doesn't include POD, where you may well need to keep certain types of whitespace. The entire POD chunk lives in its own MDOM::Token::Pod object. 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::Whitespace(3pm)
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