Public/Select-XMLNode.ps1
|
function Select-XMLNode { [CmdletBinding()] Param ( [Parameter ( Position = 1, Mandatory = $true, HelpMessage = "XML content" )] [ValidateNotNullOrEmpty()] [System.XML.XMLDocument] $XML, [Parameter ( Position = 2, Mandatory = $true, HelpMessage = "XPath corresponding to the node" )] [ValidateNotNullOrEmpty()] [String] $XPath, [Parameter ( Position = 3, Mandatory = $false, HelpMessage = "Namespace" )] [ValidateNotNullOrEmpty()] [String] $Namespace = $XML.DocumentElement.NamespaceURI ) Begin { # Get global preference variables Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState } Process { # Variables $Delimiter = "/" $Alias = "x" # Check PowerShell version to determine if sanitation can be performed if ($PSVersionTable.PSVersion.Major -ge 5) { $SpecialCharacters = [RegEx]::New('^[/.@]*') if ($XPath -match $SpecialCharacters) { $Prefix = $Matches[0] $XPath = $XPath -replace $SpecialCharacters, '' } } else { # Else skip sanitation check Write-Log -Type "DEBUG" -Object "XPath sanitation could not be performed due to the PowerShell version $($PSVersionTable.PSVersion.Major) limitations" Write-Log -Type "DEBUG" -Object $XPath } # Get namespace $NamespaceManager = New-Object -TypeName "Xml.XmlNamespaceManager" -ArgumentList $XML.NameTable $NamespaceManager.AddNamespace($Alias, $Namespace) # Split XPath to identify nodes $Nodes = $XPath.Split($Delimiter) $PrefixedNodes = New-Object -TypeName "System.Collections.ArrayList" # Prefix nodes with namespace (alias) foreach($Node in $Nodes) { if ($Node) { [Void]$PrefixedNodes.Add("${Alias}:${Node}") } } # Join prefixed-nodes to create new XPath with namespace $XPathWithNamespace = $PrefixedNodes -join $Delimiter # Check XPath prefix if ($Prefix) { $XPathWithNamespace = $Prefix + "" + $XPathWithNamespace } # Select and return nodes $SelectedNodes = $XML.SelectNodes($XPathWithNamespace, $NamespaceManager) return $SelectedNodes } } |