src/core.ps1
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$ErrorActionPreference = "Stop" ."$PSScriptRoot\types.ps1" # idempotently applies a requirement function applyRequirement([Requirement]$Requirement) { $result = $false if ($Requirement.Test) { [RequirementEvent]::new($Requirement, "Test", "Start") $result = &$Requirement.Test [RequirementEvent]::new($Requirement, "Test", "Stop", $result) } if (-not $result) { if ($Requirement.Set) { [RequirementEvent]::new($Requirement, "Set", "Start") &$Requirement.Set [RequirementEvent]::new($Requirement, "Set", "Stop", $result) } if ($Requirement.Test -and $Requirement.Set) { [RequirementEvent]::new($Requirement, "Validate", "Start") $result = &$Requirement.Test [RequirementEvent]::new($Requirement, "Validate", "Stop", $result) if (-not $result) { Write-Error "Failed to apply Requirement '$($Requirement.Name)'" } } } } # applies an array of requirements function applyRequirements([Requirement[]]$Requirements) { $Requirements | % { applyRequirement $_ } } # sorts an array of Requirements in topological order function sortRequirements([Requirement[]]$Requirements) { $stages = @() while ($Requirements) { $nextStages = $Requirements ` | ? { -not ($_.DependsOn | ? { $_ -notin $stages.Name }) } if (-not $nextStages) { throw "Could not resolve the dependencies for Requirements with names: $($Requirements.Name -join ', ')" } $Requirements = $Requirements | ? { $_.Name -notin $nextStages.Name } $stages += $nextStages } $stages } |