Get-InvocationStatement.ps1

function Get-InvocationStatement {
    [cmdletbinding()]
    param(
        [object] $Statement = $MyInvocation.Statement
    )
    $tokens = $null
    $psb = [ordered]@{}
    $null = [System.Management.Automation.Language.Parser]::ParseInput($Statement, [ref] $tokens, [ref] $null)
    $filteredTokens = $tokens | Where-Object { $_.Kind -in @('Variable','SplattedVariable','Parameter') }
    for ($i = 0; $i -lt $filteredTokens.Count; $i++) {
        $token = $filteredTokens[$i]
        if ($token.Kind -eq 'Parameter') {
            $psb[$token.ParameterName] = [ordered]@{
                Value = $ExecutionContext.SessionState.PSVariable.GetValue($token.ParameterName)
                Type  = $token.Kind
            }
        }
        if ($token.Kind -eq 'Variable') {
            $Parametername = $filteredTokens[$i - 1].ParameterName
            $psb[$Parametername].VariablePath = $token.VariablePath
        }
        if ($token.Kind -eq 'SplattedVariable') {
            $CurrentToken = $token
            $ExecutionContext.SessionState.PSVariable.GetValue($token.Name).GetEnumerator() | ForEach-Object {
                $psb[$_.Name] = [ordered]@{
                    Value        = $_.Value
                    Type         = $CurrentToken.Kind
                    VariablePath = $CurrentToken.VariablePath
                }
            }
        }
    }
    $psb
}
function test {
    param(
        [int] $param1,
        [int] $param2,
        [int] $param3,
        [switch] $param4,
        [String] $paramX = 'default value'
    )
    Get-InvocationStatement $MyInvocation.Statement
}
$foo = 3
$splat = @{
    param1 = 1
}
test @splat -param2 2 -param3 $foo -Param4