scripts/Interpolate-Evals.ps1
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function Interpolate-Evals { [CmdletBinding()] param ( [Parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $true)] [hashtable]$step, [Parameter(Position = 1, Mandatory = $false)] [regex]$regex = '\$\[(?<key>.*?)\[(?<eval>.*?)\]\]', [Parameter(Position = 2, Mandatory = $false)] [string]$groupKey = 'eval', [Parameter(Position = 3, Mandatory = $false)] [hashtable]$config = (Coalesce (Peek-Config), @{}), [Parameter(Position = 4, Mandatory = $false)] [string]$template_key = $null ) process { "Interpolate-Evals:In:$(@{'$_'=$_;'$template_key'="$template_key"} | ConvertTo-Yaml)" | f-log-dbg $context_tmp = $step['$context'] if (-not $template_key) { $template_key = $context_tmp.template_key } try { if ($template_key) { New-Variable -Name $template_key -Value $step -Force } if ($context_tmp) { $step['$context'] = $null } $json = $step | f-ctj "Interpolate-Evals:In:`$json = $json" | f-log-dbg $counter = 0 do { foreach ($match in $regex.Matches($json)) { $eval = $match.Groups[$groupKey].Value $key = $match.Groups['key'].Value $subst = $match.Groups[0].Value "Interpolate-Evals:Groups:`n$(@{subst=$subst;eval=$eval;key=$key} | ConvertTo-Yaml))" | f-log-dbg if (($key) -and ($step.$($key) -is [string]) -and ($regex.Match($step.$($key)).Success)) { # it might be evaluated later continue } $value = Invoke-Expression ("`"$eval`"" | ConvertFrom-Json) "Interpolate-Evals:Eval:$(@{'$value'=$value} | ConvertTo-Yaml)" | f-log-dbg if ($value -isnot [string]) { # assign complex values via json, the trick with ,@(...) is to pass an array as itself into the pipeline $value = ,@($value) | f-ctj $json = $json.Replace("`"$subst`"", $value) # <<< it migth be former string } else { $value = $value | f-escape-json } $json = $json.Replace($subst, $value) "Interpolate-Evals:Replace:`$value = $value" | f-log-dbg "Interpolate-Evals:Replace:`$json = $json" | f-log-dbg } if ($counter++ -ge ${global:pwshake-context}.options.max_depth) { throw "Circular reference detected for evaluations: $($regex.Matches($json) | Sort-Object -Property Value)" } $step = $json | ConvertFrom-Yaml if ($template_key) { Set-Variable -Name $template_key -Value $step -Force } $json = $step | f-ctj } while ($regex.Match($json).Success) } finally { if ($context_tmp) { $step['$context'] = $context_tmp } } "Interpolate-Evals:Out:$(@{'$step'=$step} | ConvertTo-Yaml)" | f-log-dbg return $step } } |