internal/functions/Confirm-ObjectValueEqualityDeep.ps1
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function Confirm-ObjectValueEqualityDeep { [CmdletBinding()] param( [Parameter(Position = 0)] $Object1, [Parameter(Position = 1)] $Object2 ) if ($null -eq $Object1 -or $null -eq $Object2) { if ($Object1 -eq $Object2) { # $Object1 and $Object2 are both $null return $true } if ($null -eq $Object1) { # $Object1 is $null, swap $Object1 and $Object2 to ensure that Object1 (the old Object2) is not $null and Object2 (the old Object1) is $null (setting it to $null is ommited because it is not used in the subsequent code) $Object1 = $Object2 $Object2 = $null } if ($Object1 -is [System.Collections.ICollection]) { # $Object1 is an ICollection, if it has 0 elements treat it as $null and therefore equal to Object2 # Arrays, ArrayList, Hashtables and other collections are all ICollection return $Object1.Count -eq 0 } elseif ($Object1 -is [string]) { # $Object1 is a string, if it is empty or only contains whitespace treat it as $null and therefore equal to Object2 return [string]::IsNullOrWhiteSpace($Object1) } else { # $Object1 has something else and not null and therefore not equal to Object2 return $false } } else { if ($Object1 -is [System.Collections.IList] -or $Object2 -is [System.Collections.Ilist]) { # $Object1 or $Object2 is an array or ArrayList if ($Object1 -isnot [System.Collections.Ilist]) { $Object1 = @($Object1) } elseif ($Object2 -isnot [System.Collections.Ilist]) { $Object2 = @($Object2) } if ($Object1.Count -ne $Object2.Count) { return $false } else { # iterate and recurse $object2List = [System.Collections.ArrayList]::new($Object2) foreach ($item1 in $Object1) { # iterate through Object1 and find a match in Object2 $foundMatch = $false for ($i = 0; $i -lt $object2List.Count; $i++) { $item2 = $object2List[$i] if (Confirm-ObjectValueEqualityDeep $item1 $item2) { # if either the array item values are equal or a deep inspection shows equal, continue to the next item by: # 1. Setting $foundMatch to $true # 2. Remove the matching item from the Object2 list, therefore reducing the computing complexity of the next iteration # 3. Breaking out of the inner "for" loop $foundMatch = $true $null = $object2List.RemoveAt($i) break } } if (!$foundMatch) { # no item in Object2 matches the current item in Object1, return false return $false } } # every item in Object1 has a match in Object2, return true return $true } } elseif ($Object1 -eq $Object2) { # $Object1 and $Object2 are the same object; not correct for a list (IList) # therefore check fo a list be first # @("S") -eq @("T","S","N") is an empty array => false if used in an if # @("T","S","N") -eq @("S") is @("S") => true if used in an if return $true } elseif ($Object1 -is [datetime] -or $Object2 -is [datetime]) { # $Object1 or $Object2 is a DateTime # Note: this must be done prior to the next test, since [DateTime] is a [System.ValueType] $dateString1 = $Object1 $dateString2 = $Object2 if ($typeName1 -is [datetime]) { $dateString1 = $Object1.ToString("yyyy-MM-dd") } if ($typeName2 -is [datetime]) { $dateString2 = $Object2.ToString("yyyy-MM-dd") } return $dateString1 -eq $dateString2 } elseif ($Object1 -is [string] -or $Object2 -is [string]) { # Will have caused $true by the second "if" statement if they match # Note: this must be done prior to the next test, since [string and [System.ValueType] # are both [PSCustomObject] (PSCustomObject is PowerShells version of [object]) } elseif (($Object1 -is [System.Collections.IDictionary] -or $Object1 -is [psobject]) ` -and ($Object2 -is [System.Collections.IDictionary] -or $Object2 -is [psobject])) { # normalize Object1 and Object2 keys or property names $normalizedKeys1 = @() $normalizedKeys2 = @() if ($Object1 -is [System.Collections.IDictionary]) { $normalizedKeys1 = $Object1.Keys } else { $normalizedKeys1 = $Object1.PSObject.Properties.Name if ($normalizedKeys1 -isnot [System.Collections.ICollection]) { $normalizedKeys1 = @($normalizedKeys1) } } if ($Object2 -is [System.Collections.IDictionary]) { $normalizedKeys2 = $Object2.Keys } else { $normalizedKeys2 = $Object2.PSObject.Properties.Name if ($normalizedKeys2 -isnot [System.Collections.ICollection]) { $normalizedKeys2 = @($normalizedKeys2) } } $allKeys = $normalizedKeys1 + $normalizedKeys2 $uniqueKeys = $allKeys | Sort-Object -Unique if ($null -eq $uniqueKeys) { # if there are no keys, return true return $true } if ($uniqueKeys -isnot [System.Collections.ICollection]) { $uniqueKeys = @($uniqueKeys) } # iterate and recurse foreach ($key in $uniqueKeys) { $item1 = $Object1.$key if ($null -eq $item1) { # property missing $key1Array = $normalizedKeys1 -eq $key if ($key1Array.Count -gt 0) { # found a matching key (case insensitive) $key1 = $key1Array[0] $item1 = $Object1.$key1 } } $item2 = $Object2.$key if ($null -eq $item2) { # property missing $key2Array = $normalizedKeys2 -eq $key if ($key2Array.Count -gt 0) { # found a matching key (case insensitive) $key2 = $key2Array[0] $item2 = $Object2.$key2 } } $match = Confirm-ObjectValueEqualityDeep $item1 $item2 if (!$match) { return $false } } # every entry in the collection has the same value, return true return $true } else { return $false } } } |