## PI_LOGIPAT

    *pi_logipat.txt*	Logical Patterns			May 01, 2019

    Author:  Charles E. Campbell  <NcampObell@SdrPchip.AorgM-NOSPAM>
    Copyright: (c) 2004-2016 by Charles E. Campbell	*logiPat-copyright*
               The VIM LICENSE applies to LogiPat.vim and LogiPat.txt
               (see |copyright|) except use "LogiPat" instead of "Vim"
    	   No warranty, express or implied.  Use At-Your-Own-Risk.

    1. Contents					*logiPat* *logiPat-contents*

    	1. Contents.................: |logiPat-contents|
    	2. LogiPat Manual...........: |logiPat-manual|
    	3. LogiPat Examples.........: |logiPat-examples|
    	4. Caveat...................: |logiPat-caveat|
    	5. LogiPat History..........: |logiPat-history|

    2. LogiPat Manual			*logiPat-manual* *logiPat-man*

    	*logiPat-arg* *logiPat-input* *logiPat-pattern* *logiPat-operators*
    	Boolean logic patterns are composed of

    			operators  ! = not
    			           | = logical-or
    			           & = logical-and
    			grouping   ( ... )
    			patterns   "pattern"

    	*logiPat-cmd*
    	:LogiPat {boolean-logic pattern}		*:LogiPat*
    		:LogiPat is a command which takes a boolean-logic
    		argument (|logiPat-arg|).

    	:LP {boolean-logic pattern}			*:LP*
    		:LP is a shorthand command version of :LogiPat
    		(|logiPat-cmd|).

    	:LPE {boolean-logic pattern}			*:LPE*
    		No search is done, but the conversion from the
    		boolean logic pattern to the regular expression
    		is performed and echoed onto the display.

    	:LogiPatFlags {search flags}			*LogiPat-flags*
    		LogiPat uses the |search()| command.  The flags
    		passed to that call to search() may be specified
    		by the :LogiPatFlags command.

    	:LPF {search flags}				*:LPF*
    		:LPF is a shorthand version of :LogiPatFlags.

    	:let pat=LogiPat({boolean-logic pattern})	*LogiPat()*
    		If one calls LogiPat() directly, no search
    		is done, but the transformation from the boolean
    		logic pattern into a regular expression pattern
    		is performed and returned.

    	To get a " inside a pattern, as opposed to having it delimit
    	the pattern, double it.

    3. LogiPat Examples					*logiPat-examples*

    	LogiPat takes Boolean logic arguments and produces a regular
    	expression which implements the choices.  A series of examples
    	follows:

    	:LogiPat "abc"
    		will search for lines containing the string  :abc:

    	:LogiPat "ab""cd"
    		will search for lines containing the string  :ab"cd:

    	:LogiPat !"abc"
    		will search for lines which don't contain the string  :abc:

    	:LogiPat "abc"|"def"
    		will search for lines which contain either the string
    		:abc:  or the string  :def:

    	:LogiPat !("abc"|"def")
    		will search for lines which don't contain either
    		of the strings  :abc:  or  :def:

    	:LogiPat "abc"&"def"
    		will search for lines which contain both of the strings
    		:abc:  and  :def:

    	:let pat= LogiPat('!"abc"')
    		will return the regular expression which will match
    		all lines not containing  :abc: .  The double quotes
    		are needed to pass normal patterns to LogiPat, and
    		differentiate such patterns from boolean logic
    		operators.

    4. Caveat						*logiPat-caveat*

    	The "not" operator may be fragile; ie. it may not always play well
    	with the & (logical-and) and | (logical-or) operators.  Please try out
    	your patterns, possibly with :set hls, to insure that what is matching
    	is what you want.

    5. LogiPat History					*logiPat-history*

    	v4 Jun 22, 2015 * LogiPat has been picked up by Bram M for standard
    			  plugin distribution; hence the name change
    	v3 Sep 25, 2006 * LP_Or() fixed; it now encapsulates its output
    	                  in \%(...\) parentheses
    	   Dec 12, 2011 * |:LPE| added
    			* "" is mapped to a single " and left inside patterns
    	v2 May 31, 2005	* LPF and LogiPatFlags commands weren't working
    	v1 May 23, 2005	* initial release

    vim:tw=78:ts=8:noet:ft=help

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