Reflection

4.8

AST.psm1

                                function Test-RestrictedLanguage {

   param(

      # The scriptblock to test against the restricted language rules

      [Parameter(Mandatory=$True)]

      [ScriptBlock]$Script,

      # Commands to allow

      [String[]]$AllowedCommands,

      # Variables to allow

      [String[]]$AllowedVariables,

      # If set, allows Environment Variables in the scriptblock

      [Switch]$AllowEnvironmentVariables

   )

   $Script.CheckRestrictedLanguage($AllowedCommands, $AllowedVariables, $AllowEnvironmentVariables)

}

function Get-ParseResults {

   param(

      # The script or file path to parse

      [Parameter(Mandatory=$true, ValueFromPipeline=$True, ValueFromPipelineByPropertyName=$True)]

      [Alias("Path","PSPath")]

      $Script

   )

   $ParseErrors = $null

   $Tokens = $null

   if(Test-Path "$Script" -ErrorAction SilentlyContinue) {

      $AST = [System.Management.Automation.Language.Parser]::ParseFile((Convert-Path $Script), [ref]$Tokens, [ref]$ParseErrors)

   } else {

      $AST = [System.Management.Automation.Language.Parser]::ParseInput([String]$Script, [ref]$Tokens, [ref]$ParseErrors)

   }

   New-Object PSObject -Property @{

      ParseErrors = $ParseErrors

      Tokens = $Tokens

      AST = $AST

   } | % { $_.PSTypeNames.Insert(0, "System.Management.Automation.Language.ParseResults"); $_ }

}

function Find-Token { 

   param(

      # test case (in the original FilterScript format used by Where-Object)

      [Parameter(Position=1)]

      [ScriptBlock]$FilterScript,

      # The AST to search for tokens

      [Parameter(Mandatory=$True, ValueFromPipeline=$true, ValueFromPipelineByPropertyName= $True)]

      [System.Management.Automation.Language.Ast]$AST,

      [Switch]$Recurse

   )

   $AST.FindAll({param($ast) Where-Object -Input $ast -FilterScript $FilterScript }, $Recurse)

}

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