feat: Porting Scala Template to Language Function (Fixes #624)

Commands/Languages/Scala/Scala-Language.ps.ps1

@@ -0,0 +1,31 @@
+Language function Scala {
+<#
+.SYNOPSIS
+    Scala Template Transpiler.
+.DESCRIPTION
+    Allows PipeScript to generate Scala.
+
+    Multiline comments with /*{}*/ will be treated as blocks of PipeScript.
+
+    Multiline comments can be preceeded or followed by 'empty' syntax, which will be ignored.
+
+    The Scala Template Transpiler will consider the following syntax to be empty:
+
+    * ```null```
+    * ```""```
+    * ```''```
+#>
+[ValidatePattern('\.(?>scala|sc)$')]
+param()
+
+    # We start off by declaring a number of regular expressions:
+    $startComment = '/\*' # * Start Comments ```\*```
+    $endComment   = '\*/' # * End Comments   ```/*```
+    $Whitespace   = '[\s\n\r]{0,}'
+    # * IgnoredContext ```String.empty```, ```null```, blank strings and characters
+    $IgnoredContext = "(?<ignore>(?>$("null", '""', "''" -join '|'))\s{0,}){0,1}"
+    # * StartPattern     ```$IgnoredContext + $StartComment + '{' + $Whitespace```
+    $startPattern = "(?<PSStart>${IgnoredContext}${startComment}\{$Whitespace)"
+    # * EndPattern       ```$whitespace + '}' + $EndComment + $ignoredContext```
+    $endPattern   = "(?<PSEnd>$Whitespace\}${endComment}\s{0,}${IgnoredContext})"   
+}