Transpilers/Templates/Ruby.Template.psx.ps1

<#
.SYNOPSIS
    Ruby Template Transpiler.
.DESCRIPTION
    Allows PipeScript to generate Ruby.

    PipeScript can be embedded in a multiline block that starts with ```=begin{``` and ends with } (followed by ```=end```)
#>

[ValidatePattern('\.rb$')]
param(
# The command information. This will include the path to the file.
[Parameter(Mandatory,ValueFromPipeline,ParameterSetName='TemplateFile')]
[Management.Automation.CommandInfo]
$CommandInfo,

# If set, will return the information required to dynamically apply this template to any text.
[Parameter(Mandatory,ParameterSetName='TemplateObject')]
[switch]
$AsTemplateObject,

# A dictionary of parameters.
[Collections.IDictionary]
$Parameter,

# A list of arguments.
[PSObject[]]
$ArgumentList
)

begin {
    # We start off by declaring a number of regular expressions:
    
    $startComment = '(?>[\r\n]{1,3}\s{0,}=begin[\s\r\n]{0,}\{)'
    $endComment   = '(?>}[\r\n]{1,3}\s{0,}=end)'

    $ignoreEach = '[\d\.]+',
        '""',
        "''"

    $IgnoredContext = "(?<ignore>(?>$($ignoreEach -join '|'))\s{0,}){0,1}"
    
    $startRegex = "(?<PSStart>${IgnoredContext}${startComment})"    
    $endRegex   = "(?<PSEnd>${endComment}${IgnoredContext})"
    
    # Create a splat containing arguments to the core inline transpiler
    $Splat      = [Ordered]@{
        StartPattern  = $startRegex
        EndPattern    = $endRegex
    }
}

process {
    # Add parameters related to the file
    $Splat.SourceFile = $commandInfo.Source -as [IO.FileInfo]
    $Splat.SourceText = [IO.File]::ReadAllText($commandInfo.Source)
    if ($Parameter) { $splat.Parameter = $Parameter }
    if ($ArgumentList) { $splat.ArgumentList = $ArgumentList }

    # If we are being used within a keyword,
    if ($AsTemplateObject) {
        $splat # output the parameters we would use to evaluate this file.
    } else {
        # Otherwise, call the core template transpiler
        .>PipeScript.Template @Splat # and output the changed file.
    }
}