Run an XSLT transformation on a glob of files with PowerShell and XslCompiledTransform

XSLT.ps1

Param(
    [Parameter(Mandatory = $True)] [string] $Path,
    [Parameter(Mandatory = $True)] [string] $Xsl,
    [Parameter(Mandatory = $False)] [string] $Filter = "*.xml",
    [Parameter(Mandatory = $False)] [string] $Target = (Join-Path (Convert-Path .) "target"),
    [Parameter(Mandatory = $False)] [hashtable] $Params
)

Set-StrictMode -version 2.0

Function Get-Transformer([System.IO.FileInfo] $stylesheet)
{
    $transformer = New-Object System.Xml.Xsl.XslCompiledTransform
    $settings = New-Object System.Xml.Xsl.XsltSettings($True, $True)
    $resolver = New-Object System.Xml.XmlUrlResolver

    Try {
        $transformer.Load($stylesheet, $settings, $resolver)
    }
    Catch {
        Throw $_.Exception.Message
    }

    return $transformer
}

Function Main([string] $path, [string] $stylesheet, [string] $filter, [string] $outputDir, [hashtable] $params)
{
    New-Item -ItemType Directory -Force -Path $outputDir | Out-Null

    $argList = New-Object System.Xml.Xsl.XsltArgumentList

    ForEach ($key in $params.Keys)
    {
        $value = $params[$key]
        $argList.AddParam($key, $null, $value)
    }

    $stylesheet = [string] (Resolve-Path $stylesheet)
    $transformer = Get-Transformer ([System.IO.FileInfo] $stylesheet)

    Get-ChildItem -Path $path -Filter $filter | ForEach-Object {
        $source = ([System.IO.FileInfo] $_.FullName)
        $output = New-Object IO.FileStream (Join-Path (Resolve-Path $outputDir) $_.Name), ([System.IO.FileMode]::Create)

        Try
        {
            $transformer.Transform($source, $argList, $output)
        }
        Finally
        {
            $output.Dispose()
        }
    }
}

Main $Path $Xsl $Filter $Target $Params