How do you call a function in Powershell with variable argument list -


i have powershell function 8 parameters. 2 mandatory , 2 mutually exclusive. gives me 24 permutations of function call.

it seems should able craft string based on presence of parameter data , execute string call function, haven't hit upon solution.

this xml input, parameters in brackets [] optional, | means either/or:

<textinsert targetfile="" startstring="" [includestartstring="true"] [endstring="" [includeendstring="true"]] [sourcefile=""|inserttext=""] [ignorecase="true"] />

i had tried constructing function call catenating variables call discovered, this:

function makeinserttextfunctioncalli  { param (     [system.xml.xmlelement]$params ) $ignorecase   = $params.ignorecase $startstring  = $params.startstring $includestart = $params.includestartstring $endstring    = $params.endstring $includeend   = $params.includeendstring $targetfile   = $params.targetfile $inserttext   = $params.inserttext $sourcefile   = $params.sourcefile  # section ############################################################# $cmdstr = "inserttext -file $targetfile -startstring $startstring"  if($includestart) {     $cmdstr += " -includestartstring" }  if($sourcefile) {     $cmdstr += " -sourcefile $sourcefile" } else {     $cmdstr += " -inserttext $inserttext" }  if($endstring) {     $cmdstr += " -endstring $endstring"     if($includeend) {         $cmdstr += " -includeendstring"     } }  if($ignorecase) {     $cmdstr += " -ignorecase" }  #    $cmdstr #    & $cmdstr invoke-expression $cmdstr

but couldn't work. tried 3 variations of calling function. of problems involved embedded quotes in arguments. issue i'm using edit markup language files there's lot of embedded <>" , such symbols. resulting in error last attempt: invoke-expression : '<' operator reserved future use.

the following section of code, inelegant , unsupportable is, work:

# section b ############################################################ #possible parameters $ctargetfile =   [convert]::toint32("10000000",2) #128 $cstartstring =  [convert]::toint32("01000000",2) #64 $cincludestart = [convert]::toint32("00100000",2) #32 $csourcefile =   [convert]::toint32("00010000",2) #16 $cinserttext =   [convert]::toint32("00001000",2) #8 $cendstring =    [convert]::toint32("00000100",2) #4 $cincludeend =   [convert]::toint32("00000010",2) #2 $cignorecase =   [convert]::toint32("00000001",2) #1  $parammask = 0 if($ignorecase)   { $parammask += $cignorecase } if($startstring)  { $parammask += $cstartstring } if($includestart) { $parammask += $cincludestart } if($sourcefile)   { $parammask += $csourcefile } if($inserttext)   { $parammask += $cinserttext } if($endstring)    { $parammask += $cendstring } if($includeend)   { $parammask += $cincludeend } if($targetfile)   { $parammask += $ctargetfile }  switch($parammask) {     192 { inserttext -file $targetfile -startstring $startstring -sourcefile $sourcefile }     193 { inserttext -file $targetfile -startstring $startstring -sourcefile $sourcefile -ignorecase }     200 { inserttext -file $targetfile -startstring $startstring -inserttext $inserttext }     201 { inserttext -file $targetfile -startstring $startstring -inserttext $inserttext -ignorecase } . . <some of 24 permutations removed brevity> .     246 { inserttext -file $targetfile -startstring $startstring -includestart -endstring $endstring -includeend -sourcefile $sourcefile }     247 { inserttext -file $targetfile -startstring $startstring -includestart -endstring $endstring -includeend -sourcefile $sourcefile -ignorecase }     238 { inserttext -file $targetfile -startstring $startstring -includestart -endstring $endstring -includeend -inserttext $inserttext }     239 { inserttext -file $targetfile -startstring $startstring -includestart -endstring $endstring -includeend -inserttext $inserttext -ignorecase }     default { #then log invalid parameters error} }

i section b unsupportable because if wants add parameter function, calculating bit mask , entering new permutation in switch statement overly time consuming; opposed adding 1 more catenation section a.

does have tips simplifying code? or critique section might improve it's workability?

mjolinor provided answer. hash splatting works. here's final working code.

$paramhash = @{} if($ignorecase)   { $paramhash.add("-ignorecase",$true) } if($startstring)  { $paramhash.add("-startstring","$startstring") } if($includestart) { $paramhash.add("-includestartstring",$true) } if($sourcefile)   { $paramhash.add("-sourcefile","$sourcefile") } if($inserttext)   { $paramhash.add("-inserttext","$inserttext") } if($endstring)    { $paramhash.add("-endstring","$endstring") } if($includeend)   { $paramhash.add("-includeendstring",$true) } if($targetfile)   { $paramhash.add("-file","$targetfile") }  inserttext @paramhash

nice, neat, compact, , readable. @mjolinor.


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