Add support for PowerShellCore beta

- Fixed an issue where the PowerShellCore beta wouldn't work due to
  renaming of internal members.

Author: SeeminglyScience

ImpliedReflection.build.ps1

@@ -1,4 +1,4 @@
-#requires -Module InvokeBuild, PSScriptAnalyzer, Pester, PlatyPS -Version 5.1
+#requires -Module @{ModuleName = 'Pester'; RequiredVersion = '3.4.3'}, InvokeBuild, PSScriptAnalyzer, PlatyPS -Version 5.1
 [CmdletBinding()]
 param()
 
@@ -58,7 +58,8 @@ task Test -If { $script:Discovery.HasTests -and $script:Settings.ShouldTest } {
     $pesterCC    = "$PSScriptRoot\module\*\*.ps1", "$PSScriptRoot\module\*.psm1"
     Start-Job {
         Set-Location $using:projectRoot
-        Invoke-Pester -PesterOption @{ IncludeVSCodeMarker = $true } -CodeCoverage $using:pesterCC
+
+        Invoke-Pester -CodeCoverage $using:pesterCC -PesterOption @{ IncludeVSCodeMarker = $true }
     } | Receive-Job -Wait -AutoRemoveJob
 }
 

module/ImpliedReflection.psd1

@@ -12,7 +12,7 @@
 RootModule = 'ImpliedReflection.psm1'
 
 # Version number of this module.
-ModuleVersion = '0.1.1'
+ModuleVersion = '0.1.2'
 
 # ID used to uniquely identify this module
 GUID = '8834a5bf-9bf2-4f09-8415-3c1e561109f6'
@@ -80,7 +80,7 @@ PrivateData = @{
         # IconUri = ''
 
         # ReleaseNotes of this module
-        ReleaseNotes = '- Fixed the module not loading.'
+        ReleaseNotes = '- Added support for PowerShell 6.0 beta 4.'
 
     } # End of PSData hashtable
 

module/ImpliedReflection.psm1

@@ -1,5 +1,22 @@
 Import-LocalizedData -BindingVariable Strings -FileName Strings -ErrorAction Ignore
 
+# In PowerShell 6 a lot of field names are changed to fit .NET standards. This is why you should
+# avoid using reflection :)
+$instancePrefix = ''
+if ($PSVersionTable.PSVersion.Major -ge 6) {
+    $instancePrefix = '_'
+}
+[Diagnostics.CodeAnalysis.SuppressMessageAttribute('PSUseDeclaredVarsMoreThanAssignments', '',
+                                                   Justification='Module scope variable used in other files.')]
+$FIELD_REFERENCE = @{
+    adapter             = "${instancePrefix}adapter"
+    indexes             = "${instancePrefix}indexes"
+    # These haven't been changed yet, but probably will soon.  Keeping it here so it's easy to fix.
+    dotNetStaticAdapter = 'dotNetStaticAdapter'
+    readOnly            = 'readOnly'
+    writeOnly           = 'writeOnly'
+}
+
 # Include all function files.
 Get-ChildItem $PSScriptRoot\Public\*.ps1 | ForEach-Object {
     . $PSItem.FullName

module/Public/Add-PrivateMember.ps1

@@ -36,19 +36,19 @@ function Add-PrivateMember {
         function NewPropertyCacheEntry([MemberInfo] $property) {
             $cacheEntry = [ref].Assembly.
                 GetType('System.Management.Automation.DotNetAdapter+PropertyCacheEntry').
-                GetConstructor(60, $null, @($property.GetType()), 1).
+                GetConstructor($FLAG_MAP.Instance, $null, @($property.GetType()), 1).
                 Invoke($property)
 
             # The cache entry uses these fields to determine if the properties for the
             # Getter/Setter delegates should create the delegate. They are set to false during
             # construction if the method isn't public.
-            $cacheEntry.GetType().GetField('writeOnly', 60).SetValue($cacheEntry, $false)
+            $cacheEntry.GetType().GetField($script:FIELD_REFERENCE.writeOnly, 60).SetValue($cacheEntry, $false)
             $isWritable = $property.SetMethod -or
                          ('Field' -eq $property.MemberType -and
                           -not $property.IsInitOnly)
 
             if ($isWritable) {
-                $cacheEntry.GetType().GetField('readOnly', 60).SetValue($cacheEntry, $false)
+                $cacheEntry.GetType().GetField($script:FIELD_REFERENCE.readOnly, 60).SetValue($cacheEntry, $false)
             }
             return $cacheEntry
         }
@@ -128,7 +128,7 @@ function Add-PrivateMember {
                     Type     = $target.psobject.BaseObject
                     Flags    = $FLAG_MAP.Static
                     Adapter  = [psobject].
-                        GetField('dotNetStaticAdapter', $FLAG_MAP.Static).
+                        GetField($script:FIELD_REFERENCE.dotNetStaticAdapter, $FLAG_MAP.Static).
                         GetValue($null)
                 }
             }
@@ -137,7 +137,7 @@ function Add-PrivateMember {
                 Type     = $target.GetType()
                 Flags    = $FLAG_MAP.Instance
                 Adapter  = [PSMethod].
-                    GetField('adapter', $FLAG_MAP.Instance).
+                    GetField($script:FIELD_REFERENCE.adapter, $FLAG_MAP.Instance).
                     GetValue($target.psobject.Methods.Item('GetType'))
             }
         }
@@ -173,7 +173,7 @@ function Add-PrivateMember {
 
                     $alreadyExists = $table.
                         GetType().
-                        GetField('indexes', $FLAG_MAP.Instance).
+                        GetField($script:FIELD_REFERENCE.indexes, $FLAG_MAP.Instance).
                         GetValue($table).
                         ContainsKey($memberName)
 

module/Public/Disable-ImpliedReflection.ps1

@@ -16,11 +16,15 @@ function Disable-ImpliedReflection {
                     [ErrorCategory]::InvalidOperation,
                     $null))
         }
+        $fieldPrefix = ''
+        if ($PSVersionTable.PSVersion.Major -ge 6) {
+            $fieldPrefix = 's_'
+        }
         foreach ($visibilityScope in 'static', 'instance') {
             foreach ($memberType in 'Property', 'Method') {
                 [ref].Assembly.
                     GetType('System.Management.Automation.DotNetAdapter').
-                    GetField("${visibilityScope}${memberType}CacheTable", [BindingFlags]'Static, NonPublic').
+                    GetField("${fieldPrefix}${visibilityScope}${memberType}CacheTable", [BindingFlags]'Static, NonPublic').
                     GetValue($null).
                     Clear()
             }

test/Add-PrivateMember.Tests.ps1

@@ -37,10 +37,15 @@ Describe 'Add-PrivateMember operation' {
             $ExecutionContext._context._formatDBManager | Should Be $null
         }
         It 'can chain with return property parameter' {
+            # More examples of why not to use reflection.
+            $moduleTable = '_moduleTable'
+            if ($PSVersionTable.PSVersion.Major -ge 6) {
+                $moduleTable = 'ModuleTable'
+            }
             $ExecutionContext |
                 Add-PrivateMember _context |
                 Add-PrivateMember Modules |
-                Add-PrivateMember _moduleTable |
+                Add-PrivateMember $moduleTable |
                 Should BeOfType 'System.Collections.Generic.Dictionary[string,psmoduleinfo]'
         }
         It 'returns the object with PassThru' {
@@ -57,13 +62,22 @@ Describe 'Add-PrivateMember operation' {
             [scriptblock]::EmptyScriptBlock | Should BeOfType scriptblock
         }
         It 'can access fields' {
-            [scriptblock]::_cachedScripts.GetType().Name | Should Be 'ConcurrentDictionary`2'
+            if ($PSVersionTable.PSVersion.Major -ge 6) {
+                [scriptblock]::s_cachedScripts.GetType().Name | Should Be 'ConcurrentDictionary`2'
+            } else {
+                [scriptblock]::_cachedScripts.GetType().Name | Should Be 'ConcurrentDictionary`2'
+            }
         }
         It 'can access methods' {
             [scriptblock]::TokenizeWordElements('one two three') | Should Be 'one','two','three'
         }
         It 'added methods are the correct type' {
-            [scriptblock]::BindArgumentsForScripblockInvoke |
+            # Always wondered if this misspelling was for some reason on purpose.
+            $methodName = 'BindArgumentsForScripBlockInvoke'
+            if ($PSVersionTable.PSVersion.Major -ge 6) {
+                $methodName = 'BindArgumentsForScriptBlockInvoke'
+            }
+            [scriptblock]::$methodName |
                 Should BeOfType 'System.Management.Automation.PSMethod'
         }
     }