SPUG: -MO=Deparse; what it is?

[Johnston, Mark]

Tim,

	Looks like a literal translation of the parse tree to me.

	Since Perl uses so many implicit shortcuts, the -MO=Deparse option could
be used to de-obfuscate someone else's dense code as well as to check to see if
the Perl interpreter was understanding one's own line of code the way it was
intended to be written.  Otherwise, my guess is that many would consider it
something like "verbose mode."

	--Mark


	-----Original Message-----
	From:	Tim Maher/CONSULTIX [tim at consultix-inc.com]
	Sent:	Saturday, January 29, 2000 2:58 PM
	To:	spug-list at pm.org
	Subject:	SPUG: -MO=Deparse; what it is?

	(E-)?SPUG-ticians,

	In a Perl Beautification discussion I had with somebody,
	the following -MO=Deparse business came up.  Does anybody
	know what this is?  (My O'Reilly bookshelf seems mute on
	the subject, and the person who brought this up has long
	since "gone out of scope" (mine, not his)).

	It sure gives interesting output, but I wouldn't call it
	a beautifier; it's more like an overzealous copy-editor!

	$ perl -n -e '1 .. 10 and print;' /etc/motd
	Linux 2.0.36. (POSIX).

	$ perl -MO=Deparse -n -e '1 .. 10 and print;' /etc/motd
	-e syntax OK
	LINE: while (defined($_ = <ARGV>)) {
	    print $_ if 1 .. 10;
	}
	$ 

	
*========================================================================*
	| Tim Maher, PhD  Consultix &              (206) 781-UNIX/8649
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	|  Pacific Software Gurus, Inc             Email: tim at consultix-inc.com
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	|  UNIX/Linux & Perl Training              http://www.consultix-inc.com
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	| 2/22: UNIX  2/28: Perl Modules  2/29: Int. Perl  3/3: Pattern Matching
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