Transpilers/Parameters/ValidateExtension.psx.ps1
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<# .SYNOPSIS Validates Extensions .DESCRIPTION Validates that a parameter or object has one or more extensions. This creates a [ValidatePattern] that will ensure the extension matches. .Example { param( [ValidateExtension(Extension=".cs", ".ps1")] $FilePath ) } |.>PipeScript .Example .> { param( [ValidateExtension(Extension=".cs", ".ps1")] $FilePath ) $FilePath } -Parameter @{FilePath=".ps1"} .EXAMPLE .> { param( [ValidateExtension(Extension=".cs", ".ps1")] $FilePath ) $FilePath } -Parameter @{FilePath="foo.txt"} #> [CmdletBinding(DefaultParameterSetName='Parameter')] param( # The extensions being validated. [Parameter(Mandatory,Position=0)] [string[]] $Extension, # A variable expression. # If this is provided, will apply a ```[ValidatePattern({})]``` attribute to the variable, constraining future values. [Parameter(ValueFromPipeline,ParameterSetName='VariableExpressionAST')] [Management.Automation.Language.VariableExpressionAST] $VariableAST ) process { $validExtensionRegex = "\.(?>$($extension -replace '^\.' -join "|"))$" [ScriptBlock]::Create(@" [ValidatePattern('$($validExtensionRegex.Replace("'","''"))')] $( if ($psCmdlet.ParameterSetName -eq 'Parameter') { 'param()' } else { '$' + $VariableAST.variablePath.ToString() } ) "@) } |