HashTable/HashTable.ps1
#region Copyright & License # Copyright © 2012 - 2020 François Chabot # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. #endregion Set-StrictMode -Version Latest <# .SYNOPSIS Compare two HashTables and returns an array of differences. .DESCRIPTION The Compare-HashTable function computes differences between two HashTables. Results are returned as an array of objects with the properties: "Key" (the name of the key for which there is a difference), "SideIndicator" (one of "<=", "!=" or "=>"), "ReferenceValue" an "DifferenceValue" (resp. the Reference and Difference value associated with the Key). .PARAMETER ReferenceHashTable The HashTable used as a reference for comparison. .PARAMETER DifferenceHashTable The HashTable that is compared to the reference HashTable. .EXAMPLE Compare-HashTable @{ a = 1 ; b = 2 ; c = 3 } @{ b = 2 ; c = 4 ; e = 5} Returns a difference for ("3 <="), c (3 "!=" 4) and e ("=>" 5). .EXAMPLE $ReferenceHashTable = @{ a = 1 ; b = 2 ; c = 3 ; f = $null ; g = 6 } $DifferenceHashTable = @{ b = 2 ; c = 4 ; e = 5 ; f = $null ; g = $null } Compare-HashTable $ReferenceHashTable $DifferenceHashTable Returns a difference for a ("3 <="), c (3 "!=" 4), e ("=>" 5) and g (6 "<="). .NOTES See https://gist.github.com/dbroeglin/c6ce3e4639979fa250cf #> function Compare-HashTable { [CmdletBinding()] [OutputType([PSCustomObject[]])] param ( [Parameter(Mandatory = $true)] [HashTable] $ReferenceHashTable, [Parameter(Mandatory = $true)] [HashTable] $DifferenceHashTable, [Parameter(Mandatory = $false, DontShow)] [string] $Prefix = '' ) Resolve-ActionPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState $ReferenceHashTable.Keys + $DifferenceHashTable.Keys | Sort-Object -Unique -PipelineVariable key | ForEach-Object -Process { $propertyName = if ($Prefix) { "$Prefix.$key" } else { $key } if ($ReferenceHashTable.ContainsKey($key) -and !$DifferenceHashTable.ContainsKey($key)) { [PSCustomObject]@{Key = $propertyName ; ReferenceValue = $ReferenceHashTable.$key ; SideIndicator = '<' ; DifferenceValue = $null } | Tee-Object -Variable difference Write-Verbose -Message $difference } elseif (!$ReferenceHashTable.ContainsKey($key) -and $DifferenceHashTable.ContainsKey($key)) { [PSCustomObject]@{Key = $propertyName ; ReferenceValue = $null ; SideIndicator = '>' ; DifferenceValue = $DifferenceHashTable.$key } | Tee-Object -Variable difference Write-Verbose -Message $difference } else { $referenceValue, $differenceValue = $ReferenceHashTable.$key, $DifferenceHashTable.$key if ($referenceValue -ne $differenceValue) { [PSCustomObject]@{Key = $propertyName ; ReferenceValue = $referenceValue ; SideIndicator = '<>' ; DifferenceValue = $differenceValue } | Tee-Object -Variable difference Write-Verbose -Message $difference } } } } <# .SYNOPSIS Returns a new HashTable which is the merging of the input hash tables. .DESCRIPTION Properties are not overwritten during the merge operation unless forced. Even when forced it is possible to provide a list of properties not to overwrite. .EXAMPLE .NOTES © 2020 be.stateless. #> function Merge-HashTable { [CmdletBinding()] [OutputType([HashTable])] param( [Parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $true)] [HashTable[]] $HashTable, [Parameter(Mandatory = $false)] [string[]] $Exclude = @(), [Parameter(Mandatory = $false)] [switch] $Force ) begin { Resolve-ActionPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState $result = @{ } } process { $HashTable | ForEach-Object -Process { $_ } -PipelineVariable currentHashTable | Select-Object -ExpandProperty Keys -PipelineVariable key | ForEach-Object -Process { $propertyExists = $result.ContainsKey($key) if (-not $propertyExists -or ($Force -and $key -notin $Exclude) ) { $result.$key = $currentHashTable.$key if ($propertyExists) { Write-Verbose -Message "Property '$key' has been overwritten because it has been defined multiple times." } } } } end { $result } } # 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