# encoding: ascii
# api: powershell
# title: New-Struct
# description: A code-generating and emitting magic function for creating type-safe struct classes for use in PowerShell!
# version: 0.1
# type: class
# author: Joel Bennett
# license: CC0
# function: New-Struct
# x-poshcode-id: 190
# x-archived: 2016-03-03T14:51:50
# x-published: 2009-05-02T07:46:00
#
# rev 1 – new join function
#
## New-Struct
## Creates a Struct class and emits it into memory
## The Struct includes a constructor which takes the parameters in order...
##
## Usage:
## # Assuming you have a csv file with no header and columns: artist,name,length
## New-Struct Song @{
## Artist=[string];
## Name=[string];
## Length=[TimeSpan];
## }
## $songs = gc C:\Scripts\songlist.csv | % { new-object Song @($_ -split ",") }
##
function New-Struct {
param([string]$Name,[HashTable]$Properties)
switch($Properties.Keys){{$_ -isnot [String]}{throw "Invalid Syntax"}}
switch($Properties.Values){{$_ -isnot [type]}{throw "Invalid Syntax"}}
# CODE GENERATION MAGIKS!
$code = @"
using System;
public struct $Name {
$($Properties.Keys | % { " public {0} {1};`n" -f $Properties[$_],($_.ToUpper()[0] + $_.SubString(1)) })
public $Name ($( [String]::join(',',($Properties.Keys | % { "{0} {1}" -f $Properties[$_],($_.ToLower()) })) )) {
$($Properties.Keys | % { " {0} = {1};`n" -f ($_.ToUpper()[0] + $_.SubString(1)),($_.ToLower()) })
}
}
"@
## Obtains an ICodeCompiler from a CodeDomProvider class.
$provider = New-Object Microsoft.CSharp.CSharpCodeProvider
## Get the location for System.Management.Automation DLL
$dllName = [PsObject].Assembly.Location
## Configure the compiler parameters
$compilerParameters = New-Object System.CodeDom.Compiler.CompilerParameters
$assemblies = @("System.dll", $dllName)
$compilerParameters.ReferencedAssemblies.AddRange($assemblies)
$compilerParameters.IncludeDebugInformation = $true
$compilerParameters.GenerateInMemory = $true
$compilerResults = $provider.CompileAssemblyFromSource($compilerParameters, $code)
if($compilerResults.Errors.Count -gt 0) {
$compilerResults.Errors | % { Write-Error $_.Line + ":`t" + $_.ErrorText }
}
}