PS.Utils

0.0.3

Components/PS.Util.AST/Public/Get-PSUtilASTFunctionDefinition.ps1

function Get-PSUtilASTFunctionDefinition {
    [CmdletBinding(
        DefaultParameterSetName = 'File'
    )]
    Param(

        [Parameter(
            ParameterSetName = 'File',
            Mandatory,
            ValueFromPipeline,
            ValueFromPipelineByPropertyName
        )]
        [Alias('FullName')]
        [String]
        $FilePath,

        [Parameter(
            ParameterSetName = 'Code',
            Mandatory,
            ValueFromPipeline
        )]
        [string]
        $Code,

        [Switch]
        $NoRecursion

    )

    BEGIN {

        $predicate = { param($astObject) $astObject.GetType().Name -eq 'FunctionDefinitionAst' }

    }  

    PROCESS {

        $errors = $null
        
        $ast = switch ($PSCmdlet.ParameterSetName) {
            'File' { [System.Management.Automation.Language.Parser]::ParseFile( $FilePath, [ref]$null, [ref]$errors) }
            'Code' { [System.Management.Automation.Language.Parser]::ParseInput($Code,     [ref]$null, [ref]$errors) }
        }
        
        
        if ($errors) { 
            throw [System.InvalidCastException]::new("Submitted text could not be converted to PowerShell because it contains syntax errors: $($errors | Out-String)")
        }
        
        $ast.FindAll($predicate, !$NoRecursion) | Add-Member -MemberType ScriptProperty -Name Type -Value { $this.GetType().Name } -PassThru -Force

    }

}