From 1260d3b68a2b7ed3398804c89a9c5933b259ef7c Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Mon, 28 Aug 2017 22:42:06 +0900
Subject: Add `__ENCODING__' support.

`__ENCODING__' returns the current encoding name (string), unlike
CRuby that returns the encoding object.
---
 mrbgems/mruby-compiler/core/parse.y | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 5cecfc06b..0e425b189 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -2968,6 +2968,15 @@ var_ref         : variable
                       snprintf(buf, sizeof(buf), "%d", p->lineno);
                       $$ = new_int(p, buf, 10);
                     }
+                | keyword__ENCODING__
+                    {
+#ifdef MRB_UTF8_STRING
+                      const char *enc = "UTF-8";
+#else
+                      const char *enc = "ASCII-8BIT";
+#endif
+                      $$ = new_str(p, enc, strlen(enc));
+                    }
                 ;
 
 backref         : tNTH_REF
-- 
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