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" LogiPat: Boolean logical pattern matcher
" Author: Charles E. Campbell
" Date: Apr 04, 2016
" Version: 4
" Purpose: to do Boolean-logic based regular expression pattern matching
" Copyright: Copyright (C) 1999-2011 Charles E. Campbell {{{1
" Permission is hereby granted to use and distribute this code,
" with or without modifications, provided that this copyright
" notice is copied with it. Like most anything else that's free,
" LogiPat.vim is provided *as is* and comes with no warranty
" of any kind, either expressed or implied. By using this
" plugin, you agree that in no event will the copyright
" holder be liable for any damages resulting from the use
" of this software.
"
" Usage: {{{1
" :LogiPat ...
"
" Boolean logic supported:
" () grouping operators
" ! not the following pattern
" | logical or
" & logical and
" "..pattern.."
" Example: {{{1
" :LogiPat !("january"|"february")
" would match all strings not containing the strings january
" or february
" GetLatestVimScripts: 1290 1 :AutoInstall: LogiPat.vim
"
" Behold, you will conceive in your womb, and bring forth a son, {{{1
" and will call his name Jesus. He will be great, and will be
" called the Son of the Most High. The Lord God will give him the
" throne of his father, David, and he will reign over the house of
" Jacob forever. There will be no end to his kingdom. (Luke 1:31-33 WEB)
" ---------------------------------------------------------------------
" Load Once: {{{1
if &cp || exists("loaded_logiPat")
finish
endif
let g:loaded_logiPat = "v4"
let s:keepcpo = &cpo
set cpo&vim
"DechoRemOn
" ---------------------------------------------------------------------
" Public Interface: {{{1
com! -nargs=* LogiPat call LogiPat(<q-args>,1)
sil! com -nargs=* LP call LogiPat(<q-args>,1)
sil! com -nargs=* LPR call LogiPat(<q-args>,1,"r")
com! -nargs=+ LPE echomsg LogiPat(<q-args>)
com! -nargs=+ LogiPatFlags let s:LogiPatFlags="<args>"
sil! com -nargs=+ LPF let s:LogiPatFlags="<args>"
" =====================================================================
" Functions: {{{1
" ---------------------------------------------------------------------
" LogiPat: this function interprets the boolean-logic pattern {{{2
fun! LogiPat(pat,...)
" call Dfunc("LogiPat(pat<".a:pat.">)")
" LogiPat(pat,dosearch)
if a:0 > 0
let dosearch= a:1
else
let dosearch= 0
endif
if a:0 >= 3
let s:LogiPatFlags= a:3
endif
let s:npatstack = 0
let s:nopstack = 0
let s:preclvl = 0
let expr = a:pat
" Lexer/Parser
while expr != ""
" call Decho("expr<".expr.">")
if expr =~ '^"'
" push a Pattern; accept "" as a single " in the pattern
let expr = substitute(expr,'^\s*"','','')
let pat = substitute(expr,'^\(\%([^"]\|\"\"\)\{-}\)"\([^"].*$\|$\)','\1','')
let pat = substitute(pat,'""','"','g')
let expr = substitute(expr,'^\(\%([^"]\|\"\"\)\{-}\)"\([^"].*$\|$\)','\2','')
let expr = substitute(expr,'^\s*','','')
" call Decho("pat<".pat."> expr<".expr.">")
call s:LP_PatPush('.*'.pat.'.*')
elseif expr =~ '^[!()|&]'
" push an operator
let op = strpart(expr,0,1)
let expr = strpart(expr,strlen(op))
" allow for those who can't resist doubling their and/or operators
if op =~ '[|&]' && expr[0] == op
let expr = strpart(expr,strlen(op))
endif
call s:LP_OpPush(op)
elseif expr =~ '^\s'
" skip whitespace
let expr= strpart(expr,1)
else
echoerr "operator<".strpart(expr,0,1)."> not supported (yet)"
let expr= strpart(expr,1)
endif
endwhile
" Final Execution
call s:LP_OpPush('Z')
let result= s:LP_PatPop(1)
" call Decho("result=".result)
" sanity checks and cleanup
if s:npatstack > 0
echoerr s:npatstack." patterns left on stack!"
let s:npatstack= 0
endif
if s:nopstack > 0
echoerr s:nopstack." operators left on stack!"
let s:nopstack= 0
endif
" perform the indicated search
if dosearch
if exists("s:LogiPatFlags") && s:LogiPatFlags != ""
" call Decho("search(result<".result."> LogiPatFlags<".s:LogiPatFlags.">)")
call search(result,s:LogiPatFlags)
else
" call Decho("search(result<".result.">)")
call search(result)
endif
let @/= result
endif
" call Dret("LogiPat ".result)
return result
endfun
" ---------------------------------------------------------------------
" s:String: Vim6.4 doesn't have string() {{{2
func! s:String(str)
return "'".escape(a:str, '"')."'"
endfunc
" ---------------------------------------------------------------------
" LP_PatPush: {{{2
fun! s:LP_PatPush(pat)
" call Dfunc("LP_PatPush(pat<".a:pat.">)")
let s:npatstack = s:npatstack + 1
let s:patstack_{s:npatstack} = a:pat
" call s:StackLook("patpush") "Decho
" call Dret("LP_PatPush : npatstack=".s:npatstack)
endfun
" ---------------------------------------------------------------------
" LP_PatPop: pop a number/variable from LogiPat's pattern stack {{{2
fun! s:LP_PatPop(lookup)
" call Dfunc("LP_PatPop(lookup=".a:lookup.")")
if s:npatstack > 0
let ret = s:patstack_{s:npatstack}
let s:npatstack = s:npatstack - 1
else
let ret= "---error---"
echoerr "(LogiPat) invalid expression"
endif
" call s:StackLook("patpop") "Decho
" call Dret("LP_PatPop ".ret)
return ret
endfun
" ---------------------------------------------------------------------
" LP_OpPush: {{{2
fun! s:LP_OpPush(op)
" call Dfunc("LP_OpPush(op<".a:op.">)")
" determine new operator's precedence level
if a:op == '('
let s:preclvl= s:preclvl + 10
let preclvl = s:preclvl
elseif a:op == ')'
let s:preclvl= s:preclvl - 10
if s:preclvl < 0
let s:preclvl= 0
echoerr "too many )s"
endif
let preclvl= s:preclvl
elseif a:op =~ '|'
let preclvl= s:preclvl + 2
elseif a:op =~ '&'
let preclvl= s:preclvl + 4
elseif a:op == '!'
let preclvl= s:preclvl + 6
elseif a:op == 'Z'
let preclvl= -1
else
echoerr "expr<".expr."> not supported (yet)"
let preclvl= s:preclvl
endif
" call Decho("new operator<".a:op."> preclvl=".preclvl)
" execute higher-precdence operators
" call Decho("execute higher-precedence operators")
call s:LP_Execute(preclvl)
" push new operator onto operator-stack
" call Decho("push new operator<".a:op."> onto stack with preclvl=".preclvl." at nopstack=".(s:nopstack+1))
if a:op =~ '!'
let s:nopstack = s:nopstack + 1
let s:opprec_{s:nopstack} = preclvl
let s:opstack_{s:nopstack} = a:op
elseif a:op =~ '|'
let s:nopstack = s:nopstack + 1
let s:opprec_{s:nopstack} = preclvl
let s:opstack_{s:nopstack} = a:op
elseif a:op == '&'
let s:nopstack = s:nopstack + 1
let s:opprec_{s:nopstack} = preclvl
let s:opstack_{s:nopstack} = a:op
endif
" call s:StackLook("oppush") "Decho
" call Dret("LP_OpPush : s:preclvl=".s:preclvl)
endfun
" ---------------------------------------------------------------------
" LP_Execute: execute operators from opstack using pattern stack {{{2
fun! s:LP_Execute(preclvl)
" call Dfunc("LP_Execute(preclvl=".a:preclvl.") npatstack=".s:npatstack." nopstack=".s:nopstack)
" execute all higher precedence operators
while s:nopstack > 0 && a:preclvl < s:opprec_{s:nopstack}
let op= s:opstack_{s:nopstack}
" call Decho("op<".op."> nop=".s:nopstack." [preclvl=".a:preclvl."] < [opprec_".s:nopstack."=".s:opprec_{s:nopstack}."]")
let s:nopstack = s:nopstack - 1
if op == '!'
let n1= s:LP_PatPop(1)
call s:LP_PatPush(s:LP_Not(n1))
elseif op == '|'
let n1= s:LP_PatPop(1)
let n2= s:LP_PatPop(1)
call s:LP_PatPush(s:LP_Or(n2,n1))
elseif op =~ '&'
let n1= s:LP_PatPop(1)
let n2= s:LP_PatPop(1)
call s:LP_PatPush(s:LP_And(n2,n1))
endif
" call s:StackLook("execute") "Decho
endwhile
" call Dret("LP_Execute")
endfun
" ---------------------------------------------------------------------
" LP_Not: writes a logical-not for a pattern {{{2
fun! s:LP_Not(pat)
" call Dfunc("LP_Not(pat<".a:pat.">)")
if a:pat =~ '^\.\*' && a:pat =~ '\.\*$'
let pat= substitute(a:pat,'^\.\*\(.*\)\.\*$','\1','')
let ret= '^\%(\%('.pat.'\)\@!.\)*$'
else
let ret= '^\%(\%('.a:pat.'\)\@!.\)*$'
endif
" call Dret("LP_Not ".ret)
return ret
endfun
" ---------------------------------------------------------------------
" LP_Or: writes a logical-or branch using two patterns {{{2
fun! s:LP_Or(pat1,pat2)
" call Dfunc("LP_Or(pat1<".a:pat1."> pat2<".a:pat2.">)")
let ret= '\%('.a:pat1.'\|'.a:pat2.'\)'
" call Dret("LP_Or ".ret)
return ret
endfun
" ---------------------------------------------------------------------
" LP_And: writes a logical-and concat using two patterns {{{2
fun! s:LP_And(pat1,pat2)
" call Dfunc("LP_And(pat1<".a:pat1."> pat2<".a:pat2.">)")
let ret= '\%('.a:pat1.'\&'.a:pat2.'\)'
" call Dret("LP_And ".ret)
return ret
endfun
" ---------------------------------------------------------------------
" StackLook: {{{2
fun! s:StackLook(description)
" call Dfunc("StackLook(description<".a:description.">)")
let iop = 1
let ifp = 1
" call Decho("Pattern Operator")
" print both pattern and operator
while ifp <= s:npatstack && iop <= s:nopstack
let fp = s:patstack_{ifp}
let op = s:opstack_{iop}." (P".s:opprec_{s:nopstack}.')'
let fplen= strlen(fp)
if fplen < 30
let fp= fp.strpart(" ",1,30-fplen)
endif
" call Decho(fp.op)
let ifp = ifp + 1
let iop = iop + 1
endwhile
" print just pattern
while ifp <= s:npatstack
let fp = s:patstack_{ifp}
" call Decho(fp)
let ifp = ifp + 1
endwhile
" print just operator
while iop <= s:nopstack
let op = s:opstack_{iop}." (P".s:opprec_{s:nopstack}.')'
" call Decho(" ".op)
let iop = iop + 1
endwhile
" call Dret("StackLook")
endfun
" ---------------------------------------------------------------------
" Cleanup And Modeline: {{{1
let &cpo= s:keepcpo
unlet s:keepcpo
" vim: ts=4 fdm=marker