parse.y: ANDDOT fluent interface

* parse.y (parser_yylex): ANDDOT at the head of the line denote
  line continuation from previous one to support fluent interface,
  as well as single dot.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52548 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Thu Nov 12 14:17:01 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (parser_yylex): ANDDOT at the head of the line denote
+	  line continuation from previous one to support fluent interface,
+	  as well as single dot.
+
 Thu Nov 12 13:49:50 2015  SHIBATA Hiroshi  <hsbt@ruby-lang.org>
 
 	* lib/rubygems: Update to RubyGems 2.5.0+ HEAD(db78980).

misc/ruby-mode.el

@@ -898,7 +898,7 @@ Emacs to Ruby."
       (goto-char ruby-indent-point)
       (beginning-of-line)
       (skip-syntax-forward " ")
-      (if (looking-at "\\.[^.]")
+      (if (looking-at "\\.[^.]\\|&\\.")
           (+ indent ruby-indent-level)
         indent))))
 

parse.y

@@ -8034,9 +8034,10 @@ parser_yylex(struct parser_params *parser)
 	      case '\13': /* '\v' */
 		space_seen = 1;
 		break;
+	      case '&':
 	      case '.': {
 		dispatch_delayed_token(tIGNORED_NL);
-		if (!peek('.')) {
+		if (peek('.') == (c == '&')) {
 		    pushback(c);
 		    dispatch_scan_event(tSP);
 		    goto retry;

test/ruby/test_syntax.rb

@@ -628,6 +628,11 @@ eom
     assert_syntax_error(":#\n foo", /unexpected ':'/)
   end
 
+  def test_fluent_dot
+    assert_valid_syntax("a\n.foo")
+    assert_valid_syntax("a\n&.foo")
+  end
+
   private
 
   def not_label(x) @result = x; @not_label ||= nil end