Support literals with underscores

Author: nicolasstucki

src/typescript/Scala.tmLanguage.ts

@@ -118,7 +118,7 @@ export const scalaTmLanguage: TmLanguage = {
           name: 'constant.language.scala'
         },
         {
-          match: '\\b((0(x|X)[0-9a-fA-F]*)|(([0-9]+\\.[0-9]+)|(\\.[0-9]+))((e|E)(\\+|-)?[0-9]+)?|[0-9]+)([LlFfDd]|UL|ul)?\\b',
+          match: '\\b((0(x|X)[0-9a-fA-F_]*)|(([0-9][0-9_]*\\.[0-9][0-9_]*)|(\\.[0-9][0-9_]*))((e|E)(\\+|-)?[0-9][0-9_]*)?|[0-9][0-9_]*)([LlFfDd]|UL|ul)?\\b',
           name: 'constant.numeric.scala'
         },
         {

tests/unit/numeric.literals.test.scala

@@ -0,0 +1,38 @@
+// SYNTAX TEST "source.scala"
+
+   1 2l 2L 3f 3F 4d 4D 5.6 2.3e56 2.3E56
+// ^ constant.numeric.scala
+//   ^^ constant.numeric.scala
+//      ^^ constant.numeric.scala
+//         ^^ constant.numeric.scala
+//            ^^ constant.numeric.scala
+//               ^^ constant.numeric.scala
+//                  ^^ constant.numeric.scala
+//                     ^^^ constant.numeric.scala
+//                         ^^^^^^ constant.numeric.scala
+//                                ^^^^^^ constant.numeric.scala
+   
+   -1
+// ^ keyword.operator.arithmetic.scala
+//  ^ constant.numeric.scala
+
+   0x123abc
+// ^^^^^^^^^ constant.numeric.scala
+
+   123_456
+// ^^^^^^^ constant.numeric.scala
+
+   0x123_abc
+// ^^^^^^^^^ constant.numeric.scala
+
+   110_222_795_799.99
+// ^^^^^^^^^^^^^^^^^^ constant.numeric.scala
+
+   110.9499_999
+// ^^^^^^^^^^^ constant.numeric.scala
+
+   2_000.343_999e561_100
+// ^^^^^^^^^^^^^^^^^^^^^ constant.numeric.scala
+
+   .123_456
+//  ^^^^^^^ constant.numeric.scala