Created
September 13, 2017 05:53
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PowerShell Dependency Resolver for DotSourcing Classes
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| # Quick Draft to Share | |
| class Node { | |
| [String] $name | |
| [Boolean] $isImported = $false | |
| [System.Collections.Generic.List[Node]] $edges | |
| hidden static [System.Collections.Generic.List[Node]] $resolved = [System.Collections.Generic.List[Node]]::new() | |
| hidden static [System.Collections.Generic.List[Node]] $unresolved = [System.Collections.Generic.List[Node]]::new() | |
| Node ([String] $name) { | |
| $this.name = $name | |
| $this.edges = [System.Collections.Generic.List[Node]]::new() | |
| } | |
| [Void] addEdge([Node] $node) { | |
| $this.edges.Add($node) | |
| } | |
| [System.Collections.Generic.List[Node]] getResolved(){ | |
| [Node]::resolved.Clear() | |
| [Node]::unresolved.Clear() | |
| $this.resolve() | |
| return ([Node]::resolved) | |
| } | |
| [String[]] getUnloaded(){ | |
| return ($this.getResolved() | Where-Object {$_.isImported -eq $false}).Name | |
| } | |
| hidden [Void] resolve () { | |
| [Node]::unresolved.add($this) | |
| foreach ($edge in $this.edges) { | |
| if($this.name -eq $edge.name) { continue } # shouldnt depend on self lol | |
| if ($edge -in [Node]::resolved) { continue } | |
| if($edge -in [Node]::unresolved) { throw "Oh noes circular dependency: {0} -> {1}" -f $this.name, $edge.name } | |
| $edge.resolve() | |
| } | |
| [Node]::resolved.add($this) | |
| [Node]::unresolved.Remove($this) | Out-Null | |
| } | |
| } | |
| class Loader { | |
| [System.Collections.Generic.List[String]] $sourceFiles | |
| $Nodes = @{} | |
| Loader($sourcefiles){ | |
| $this.sourceFiles = (Get-ChildItem -Path $sourcefiles -Recurse -ErrorAction SilentlyContinue) | |
| } | |
| [Loader] populateNodes() { | |
| foreach($file in $this.sourceFiles) { | |
| $this.Nodes.Add($file, [Node]::new($file)) | |
| } | |
| return $this | |
| } | |
| [Loader] populateEdges() { | |
| foreach($node in $this.Nodes.GetEnumerator()) { | |
| $needs = [Loader]::getUnloadedTypes($node.Name) | |
| foreach($need in $needs) { | |
| # File Names have to be unique | |
| $needKey = ($this.Nodes.Keys | Where-Object { $_ -like "*$need.ps1" } | Select-Object -First 1) | |
| $node.Value.addEdge($this.Nodes[$needKey]) | |
| } | |
| } | |
| return $this | |
| } | |
| [Void] loadDependencies() { | |
| while($this.sourceFiles.ToArray().Count -gt 0) { | |
| $importables = $this.Nodes[$this.sourceFiles[0]].getUnloaded() | |
| foreach($import in $importables) { | |
| try { | |
| Write-Host "Importing: $import" -ForegroundColor Gray | |
| . $import | |
| Write-Host "Success!" -ForegroundColor Green | |
| } catch { | |
| Write-Error "Crap: $_" | |
| } | |
| $this.Nodes[$import].isImported = $true | |
| $this.sourceFiles.Remove($import) | Out-Null | |
| } | |
| } | |
| } | |
| static [System.Collections.Generic.List[String]] getUnloadedTypes([String] $file) { | |
| $tokens = $null | |
| $ast = [System.Management.Automation.Language.Parser]::ParseFile($file, [ref]$tokens, [ref]$null) | |
| $types = ($tokens | Select * -Unique | Where-Object {$_.TokenFlags -eq "TypeName"}).Text | |
| $unloaded = [System.Collections.Generic.List[String]]::new() | |
| foreach ($type in $types) { | |
| if (!([System.Management.Automation.PSTypeName]$type).Type) { | |
| $unloaded.Add($type) | |
| } | |
| } | |
| return $unloaded | |
| } | |
| } | |
| $Loader = [Loader]::new("C:\Posh\MyModule\src\*.ps1") | |
| $Loader.populateNodes().populateEdges().loadDependencies() |
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This looks interesting but as I'm on my phone and not able test curious what does it do?