Transpilers/Core/PipeScript.ParameterTypeConstraint.psx.ps1
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<# .SYNOPSIS Transpiles Parameter Type Constraints .DESCRIPTION Transpiles Parameter Type Constraints. A Type Constraint is an AST expression that constrains a value to a particular type (many languages call this a type cast). If the type name does not exist, and is not [ordered], PipeScript will search for a transpiler and attempt to run it. #> [ValidateScript({ if (-not $_.Parent -is [Management.Automation.Language.ParameterAst]) { return $false } $isRealType = $_.TypeName.GetReflectionType() if ($isRealType) { return $false } return $true })] param( [Parameter(Mandatory,ParameterSetName='ParameterAst',ValueFromPipeline)] [Management.Automation.Language.TypeConstraintAst] $TypeConstraintAST ) process { # First, find the script block that this parameter lives within. # We may need it to determine any greater context $astPointer = $TypeConstraintAST $scriptBlockContext = do { # do this by walking up the parents $astPointer = $astPointer.Parent } while ($astPointer -isnot [Management.Automation.Language.ScriptBlockAst]) # until it is a script block AST. $isRealType = $TypeConstraintAST.TypeName.GetReflectionType() if ($isRealType) { return } if ($TypeConstraintAST.TypeName.Name -eq 'ordered') { return } try { Invoke-PipeScript -TypeConstraint $TypeConstraintAST } catch { $errorInfo = $_ $PSCmdlet.WriteError($errorInfo) } } |