src/public/Format-ScriptExpandStatementBlocks.ps1
|
function Format-ScriptExpandStatementBlocks { <# .SYNOPSIS Expand any statement code blocks found in curly braces from inline to a more readable format. .DESCRIPTION Expand any statement code blocks found in curly braces from inline to a more readable format. So this: if ($a) { Write-Output $true } becomes this: if ($a) { Write-Output $true } .PARAMETER Code Multiline or piped lines of code to process. .PARAMETER DontExpandSingleLineBlocks Skip expansion of a codeblock if it only has a single line. .PARAMETER SkipPostProcessingValidityCheck After modifications have been made a check will be performed that the code has no errors. Use this switch to bypass this check (This is not recommended!) .EXAMPLE PS > $testfile = 'C:\temp\test.ps1' PS > $test = Get-Content $testfile -raw PS > $test | Format-ScriptExpandStatementBlocks | clip Description ----------- Takes C:\temp\test.ps1 as input, expands code blocks and places the result in the clipboard. .NOTES Author: Zachary Loeber Site: http://www.the-little-things.net/ Requires: Powershell 3.0 Version History 1.0.0 - Initial release #> [CmdletBinding()] param( [parameter(Position = 0, Mandatory = $true, ValueFromPipeline=$true, HelpMessage='Lines of code to process.')] [AllowEmptyString()] [string[]]$Code, [parameter(Position = 1, HelpMessage='Skip expansion of a codeblock if it only has a single line.')] [switch]$DontExpandSingleLineBlocks, [parameter(Position = 2, HelpMessage='Bypass code validity check after modifications have been made.')] [switch]$SkipPostProcessingValidityCheck ) begin { # Pull in all the caller verbose,debug,info,warn and other preferences if ($script:ThisModuleLoaded -eq $true) { Get-CallerPreference -Cmdlet $PSCmdlet -SessionState $ExecutionContext.SessionState } $FunctionName = $MyInvocation.MyCommand.Name Write-Verbose "$($FunctionName): Begin." $Codeblock = @() $ParseError = $null $Tokens = $null <# Need to find the following: StatementBlockAst not below SubExpressionAST (like $($var)) ScriptBlockExpressionAST (like Foreach {}) NamedBlockAST ScriptBlockAST ParamBlockAST #> $predicate = {$args[0] -is [System.Management.Automation.Language.StatementBlockAst] -and (-not $args[0].Unnamed)} } process { $Codeblock += $Code } end { $ScriptText = $Codeblock | Out-String Write-Verbose "$($FunctionName): Attempting to parse AST." $AST = [System.Management.Automation.Language.Parser]::ParseInput($ScriptText, [ref]$Tokens, [ref]$ParseError) if($ParseError) { $ParseError | Write-Error throw "$($FunctionName): Will not work properly with errors in the script, please modify based on the above errors and retry." } # First get all blocks $Blocks = $AST.FindAll($predicate, $true) # Just in case we screw up and create more blocks than we started with this will prevent an endless loop $StartingBlocks = $Blocks.count for($t = 0; $t -lt $StartingBlocks; $t++) { # We have to reprocess the entire ast lookup process every damn time we make a change. Must be a better way... $AST = [System.Management.Automation.Language.Parser]::ParseInput($ScriptText, [ref]$Tokens, [ref]$ParseError) $Blocks = $AST.FindAll($predicate, $true) $ParentTypes = @(Get-ParentASTTypes $Blocks[$t]) $KeepProcessing = $true if (($ParentTypes -contains 'SubExpressionAST') -or ($Blocks[$t].Extent.GetType().Name -eq 'EmptyScriptExtent') -or ($ParentTypes[0] -eq 'ArrayExpressionAST')) { $KeepProcessing = $false } if ($KeepProcessing) { $B = $Blocks[$t].Extent.Text $InnerBlock = ($B.Substring($B.indexof('{') + 1,($B.LastIndexOf('}') - ($B.indexof('{') + 1)))).Trim() $codelinecount = @($InnerBlock -split "`r`n").Count $RemoveStart = $Blocks[$t].Extent.StartOffset $RemoveEnd = $Blocks[$t].Extent.EndOffset - $RemoveStart if (($codelinecount -le 1) -and $DontExpandSingleLineBlocks) { $NewExtent = [string]($Blocks[$t].Blockkind) + "`r`n{ " + $InnerBlock + " }" } else { $NewExtent = [string]($Blocks[$t].Blockkind) + "`r`n{`r`n" + $InnerBlock + "`r`n}" } $ScriptText = $ScriptText.Remove($RemoveStart,$RemoveEnd).Insert($RemoveStart,$NewExtent) Write-Verbose "$($FunctionName): Processing block number $t of blocktype $($Blocks[$t].Blockkind)" } } # Validate our returned code doesn't have any unintentionally introduced parsing errors. if (-not $SkipPostProcessingValidityCheck) { if (-not (Format-ScriptTestCodeBlock -Code $ScriptText)) { throw "$($FunctionName): Modifications made to the scriptblock resulted in code with parsing errors!" } } $ScriptText Write-Verbose "$($FunctionName): End." } } |