From 0f08914ac0d433545a4224ee1c3f8d3eb8d51e68 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Thu, 1 Dec 2016 14:37:59 +0900
Subject: Support multiple elements \u syntax

---
 mrbgems/mruby-compiler/core/parse.y | 14 ++++++++++++++
 test/t/unicode.rb                   |  4 ++++
 2 files changed, 18 insertions(+)

diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 65b89bed3..f0c45b85b 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -3995,6 +3995,20 @@ parse_string(parser_state *p)
           tokadd(p, '\\');
           tokadd(p, c);
         }
+        else if (c == 'u' && peek(p, '{')) {
+          /* \u{xxxx xxxx xxxx} form */
+          nextc(p);
+          while (1) {
+            do c = nextc(p); while (ISSPACE(c));
+            if (c == '}') break;
+            pushback(p, c);
+            c = read_escape_unicode(p, 8);
+            if (c < 0) break;
+            tokadd(p, -c);
+          }
+          if (hinf)
+            hinf->line_head = FALSE;
+        }
         else {
           pushback(p, c);
           tokadd(p, read_escape(p));
diff --git a/test/t/unicode.rb b/test/t/unicode.rb
index b8c54ca66..8622ae08a 100644
--- a/test/t/unicode.rb
+++ b/test/t/unicode.rb
@@ -33,3 +33,7 @@ assert('braced \u notation test') do
   assert_equal("\xF0\x90\x80\x80", "\u{10000}")
   assert_equal("\xF4\x8F\xBF\xBF", "\u{10FFFF}")
 end
+
+assert('braced multiple \u notation test') do
+  assert_equal("ABC", "\u{41 42 43}")
+end
-- 
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