(erlang) add support for underscore separators in numeric literals

Author: seriyps

src/languages/erlang-repl.js

@@ -23,7 +23,7 @@ export default function(hljs) {
       hljs.COMMENT('%', '$'),
       {
         className: 'number',
-        begin: '\\b(\\d+#[a-fA-F0-9]+|\\d+(\\.\\d+)?([eE][-+]?\\d+)?)',
+        begin: '\\b(\\d+(_\\d+)*#[a-fA-F0-9]+(_[a-fA-F0-9]+)*|\\d+(_\\d+)*(\\.\\d+(_\\d+)*)?([eE][-+]?\\d+)?)',
         relevance: 0
       },
       hljs.APOS_STRING_MODE,

src/languages/erlang.js

@@ -20,7 +20,7 @@ export default function(hljs) {
   var COMMENT = hljs.COMMENT('%', '$');
   var NUMBER = {
     className: 'number',
-    begin: '\\b(\\d+#[a-fA-F0-9]+|\\d+(\\.\\d+)?([eE][-+]?\\d+)?)',
+    begin: '\\b(\\d+(_\\d+)*#[a-fA-F0-9]+(_[a-fA-F0-9]+)*|\\d+(_\\d+)*(\\.\\d+(_\\d+)*)?([eE][-+]?\\d+)?)',
     relevance: 0
   };
   var NAMED_FUN = {

test/detect/erlang-repl/default.txt

@@ -25,3 +25,7 @@ ok
 5
 11> 1.85e+3.
 1850
+12> 16#DEAD_BEEF.
+3735928559
+13> Million = 1_000_000.
+1000000

test/detect/erlang/default.txt

@@ -6,6 +6,10 @@
 %% backwards compatibility
 -export([listen/1, listen/2, listen/3, listen/4, stop/1]).
 
+-define(MILLION, 1_000_000).
+-define(BIT_FLAG, 2#1100_0011_1010_0101).
+-define(PI, 3.14159_26535_89793).
+
 if L =/= [] ->      % If L is not empty
     sum(L) / count(L);
 true ->