Public/Intrinisic Functions/Add-FnSplit.ps1
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function Add-FnSplit { <# .SYNOPSIS Adds the intrinsic function "Fn::Split" to a resource property .DESCRIPTION To split a string into a list of string values so that you can select an element from the resulting string list, use the Fn::Split intrinsic function. Specify the location of splits with a delimiter, such as , (a comma). After you split a string, use the Fn::Select function to pick a specific element. For example, if a comma-delimited string of subnet IDs is imported to your stack template, you can split the string at each comma. From the list of subnet IDs, use the Fn::Select intrinsic function to specify a subnet ID for a resource. .LINK http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-split.html .PARAMETER Delimiter A string value that determines where the source string is divided. .PARAMETER SourceString The string value that you want to split. This can be a string or object from an Add-Fn* function output .EXAMPLE Add-FnSplit -Delimiter "," -SourceString (Add-FnImportValue -ValueToImport "AccountSubnetIds") When the template is exported, this will convert to: {"Fn::Split":[",",{"Fn::ImportValue":"AccountSubnetIds"}]} .NOTES For the Fn::Split delimiter, you cannot use any functions. You must specify a string value. For the Fn::Split list of values (SourceString), you can use the following functions: Fn::Base64 Fn::FindInMap Fn::GetAtt Fn::GetAZs Fn::If Fn::Join Fn::Select Ref .FUNCTIONALITY Vaporshell #> [OutputType('Vaporshell.Function.Split')] [cmdletbinding()] Param ( [parameter(Mandatory = $true,Position = 0)] [System.String] $Delimiter, [parameter(Mandatory = $true,Position = 1)] [ValidateScript({ $allowedTypes = "Vaporshell.Condition.If","Vaporshell.Function.Base64","Vaporshell.Function.FindInMap","Vaporshell.Function.GetAtt","Vaporshell.Function.GetAZs","Vaporshell.Function.Join","Vaporshell.Function.Select","Vaporshell.Function.Ref","System.String" if ([string]$($_.PSTypeNames) -match "($(($allowedTypes|ForEach-Object{[RegEx]::Escape($_)}) -join '|'))") { $true } else { throw "The SourceString parameter only accepts the following types: $($allowedTypes -join ", "). The current types of the value are: $($_.PSTypeNames -join ", ")." } })] $SourceString ) $obj = [PSCustomObject][Ordered]@{ "Fn::Split" = @($Delimiter,$SourceString) } $obj | Add-ObjectDetail -TypeName 'Vaporshell.Function','Vaporshell.Function.Split' Write-Verbose "Resulting JSON from $($MyInvocation.MyCommand): `n`n`t$($obj | ConvertTo-Json -Depth 5 -Compress)`n" } |