scripts/Interpolate-Attributes.ps1
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function Interpolate-Attributes { [CmdletBinding()] param ( [Parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $true)] [hashtable]$config ) process { $ErrorActionPreference = "Stop" $yaml = $config | ConvertTo-Yaml $regex = [regex]"{{(?<subst>([^{{.*}}]|[.*])*?)}}" $counter = 0 do { foreach ($substitute in (Get-Matches $yaml $regex 'subst')) { if ($substitute -match '^\$\((?<eval>.*?)\)$') { $eval = Get-Matches $substitute '^\$\((?<eval>.*?)\)$' 'eval' $value = Invoke-Expression $eval $yaml = $yaml.Replace("{{$substitute}}", "$value") } elseif ($substitute -match '^\$env:') { $value = Invoke-Expression $substitute $yaml = $yaml.Replace("{{$substitute}}", "$value") } else { $value = Invoke-Expression "`$config.attributes.$substitute" -ErrorAction Stop if (-not $regex.Match($value).Success) { $yaml = $yaml.Replace("{{$substitute}}", "$value") } } } if ($counter++ -ge ${pwshake-context}.max_depth) { throw "Circular reference detected for substitutions: $($regex.Matches($yaml) | Sort-Object -Property Value)" } $config = ConvertFrom-Yaml $yaml $yaml = ConvertTo-Yaml $config } while ($regex.Match($yaml).Success) return ConvertFrom-Yaml $yaml } } |