Transpilers/Syntax/EqualityComparison.psx.ps1
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<# .SYNOPSIS Allows equality comparison. .DESCRIPTION Allows most equality comparison using double equals (==). Many languages support this syntax. PowerShell does not. This transpiler enables equality comparison with ==. .NOTES This will not work if there is a constant on both sides of the expression if ($null == $null) { "this will work"} if ('' == '') { "this will not"} .EXAMPLE Invoke-PipeScript -ScriptBlock { $a = 1 if ($a == 1 ) { "A is $a" } } .EXAMPLE { $a == "b" } | .>PipeScript #> [ValidateScript({ # This is valid if the assignment statement's $AssignmentStatementAST = $_ # right side is followed by an = and at least one space. $AssignmentStatementAST.Right -match '^=\s{1,}' })] param( # The original assignment statement. [Parameter(Mandatory,ValueFromPipeline)] [Management.Automation.Language.AssignmentStatementAst] $AssignmentStatementAST ) process { # This is a very trivial transpiler. # We create a new script by: $newScript = # taking the left side as-is. $AssignmentStatementAST.Left.Extent.ToString() + # replacing the = with ' -eq ' ' -eq ' + # And replacing any the = and any trailing whitespace. ($AssignmentStatementAST.Right.Extent.ToString() -replace '^=\s{1,}') [scriptblock]::Create($newScript) } |