Public/Set-placeholderValue.ps1
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function Set-placeholderValue { <# .SYNOPSIS Inject values from a table into tagged placeholders in json files. .DESCRIPTION Inject values from a table into tagged placeholders in json files. .PARAMETER jsonFile The json template to process. .PARAMETER buildValues Values table from which to populate json files. .INPUTS System.IO.FileInfo. Target json placeholder file. .OUTPUTS None. .EXAMPLE $jsonFiles | Set-placeholderValue -buildValues $buildValues Inject values from $buildValues table into placeholders in $jsonFiles. .LINK .NOTES 01 Alistair McNair Initial version. #> [CmdletBinding()] Param ( [Parameter(Mandatory=$true,ValueFromPipeline=$true)] [System.IO.FileInfo]$jsonFile, [Parameter(Mandatory=$true,ValueFromPipeline=$false)] [System.Object]$buildValues ) begin { Write-Verbose ("Function start.") } # begin process { Write-Verbose ("Processing JSON file " + $jsonFile.fullname) ## Determine function name and sequence ID $functionName = $jsonFile.name.split("$")[1].split(".")[0] $sequenceID = $jsonFile.name.split("$")[0] Write-Verbose ("Function name is " + $functionName) Write-Verbose ("Stage ID is " + $sequenceID) ## Configure return object $jsonStage = [pscustomobject]@{"Function" = $functionName; "SequenceID" = $sequenceID; "Objects" = @()} ## Insert placeholder values to this object $json = Get-Content -Path $jsonFile.FullName $newJSON = @() ## Iterate through each row and replace placeholders with values $i = 1 foreach ($row in $json) { Write-Verbose ("Processing row number " + $i) ## Set regex to catch value from tags $tagPattern = '(?i)<@@[^>]*>(.*)</@@>' ## Apply regex to get value from tag on this row $result = [Regex]::Match($row, $tagPattern) ## If a tag was found on this line, find metadata value if ($result.Success) { Write-Verbose ("Placeholder tag detected at row " + $i) ## Tag has been found, retreive a value $metaValue = ($buildValues | Where-Object {$_.key -eq $result.Groups[1].value}).value Write-Verbose ("Value " + $metaValue + " will be injected.") if ($metaValue) { Write-Verbose ("Metadata placeholder " + $result.Groups[1].value + " has been populated with value " + $metaValue) } # if else { throw ("Placeholder " + $result.Groups[1].value + " from JSON file " + $jsonFile.FullName + " could not be found in values table.") } # else ## Insert this value into the string $row = $row -replace $result.Groups[0].value,$metaValue } # if else { Write-Verbose ("No placeholder tag found at this row.") } # else ## Append row to new JSON $newJSON += $row ## Increment counter $i++ } # foreach try { ## Apply JSON escape character to \ $newJSON = $newJSON.Replace("\","\\") $jsonStage.Objects += $newJSON | ConvertFrom-Json -ErrorAction Stop } # try catch { Write-Debug ("Failed to add stage object.") throw ("Failed to add stage object. The CMDlet returned: " + $_.exception.message) } # catch Write-Verbose ("Finished processing JSON file.") return $jsonStage } # process end { Write-Verbose ("Function complete.") } # end } # function |