Merge pull request #363 from antosha417/shebang

Support shebang.

corpus/comments.txt

@@ -87,3 +87,16 @@ Using directives
       (using_directive_key)
       (using_directive_value)))
   (comment))
+
+================================================================================
+Shebang
+================================================================================
+
+#!/usr/bin/env -S scala-cli shebang -S 3
+
+"shebang"
+--------------------------------------------------------------------------------
+
+(compilation_unit
+  (comment)
+  (string))

grammar.js

@@ -103,8 +103,10 @@ module.exports = grammar({
 
   rules: {
     // TopStats          ::=  TopStat {semi TopStat}
-    compilation_unit: $ =>
+    compilation_unit: $ => seq(
+      optional($._shebang),
       optional(trailingSep1($._semicolon, $._top_level_definition)),
+    ),
 
     _top_level_definition: $ =>
       choice(
@@ -1712,6 +1714,8 @@ module.exports = grammar({
         repeat1($.guard),
       ),
 
+    _shebang: $ => alias(token(seq("#!", /.*/)), $.comment),
+
     comment: $ => seq(token("//"), choice($.using_directive, $._comment_text)),
     _comment_text: $ => token(prec(PREC.comment, /.*/)),