private/Compare-VersionStrings.ps1
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function Compare-VersionStrings { <# .SYNOPSIS This function parses some of Lenovos conventions for expressing version requirements and does the comparison. Returns 0, -1 or -2. #> Param ( [ValidateNotNullOrEmpty()] [string]$LenovoString, [ValidateNotNullOrEmpty()] [string]$SystemString ) [bool]$LenovoStringIsVersion = [Version]::TryParse( $LenovoString, [ref]$null ) [bool]$SystemStringIsVersion = [Version]::TryParse( $SystemString, [ref]$null ) if (-not $SystemStringIsVersion) { Write-Verbose "Got unsupported version format from OS: '$SystemString'" return -2 } if ($LenovoStringIsVersion) { # Easiest case, both inputs are just version numbers if ([Version]::new($LenovoString) -eq [Version]::new($SystemString)) { return 0 # SUCCESS, Versions match } else { return -1 } } else { # Lenovo string contains additional directive (^-symbol likely) if (-not ($LenovoString -match '^\^?[\d\.]+$' -xor $LenovoString -match '^[\d\.]+\^?$')) { # Unknown character in version string or ^ at both the first and last positions Write-Verbose "Got unsupported version format from Lenovo: '$LenovoString'" return -2 } [Version]$LenovoVersion = $LenovoString -replace '\^' [Version]$SystemVersion = $SystemString switch -Wildcard ($LenovoString) { "^*" { # Means up to and including if ($SystemVersion -le $LenovoVersion) { return 0 } else { return -1 } } "*^" { # Means must be equal or higher than if ($SystemVersion -ge $LenovoVersion) { return 0 } else { return -1 } } default { Write-Verbose "Got unsupported version format from Lenovo: '$LenovoString'" return -2 } } } } |