+ ruby27.y: branch parser. (#546)

.gitignore

@@ -28,5 +28,6 @@ lib/parser/ruby23.rb
 lib/parser/ruby24.rb
 lib/parser/ruby25.rb
 lib/parser/ruby26.rb
+lib/parser/ruby27.rb
 lib/parser/macruby.rb
 lib/parser/rubymotion.rb

Rakefile

@@ -31,6 +31,7 @@ GENERATED_FILES = %w(lib/parser/lexer.rb
                      lib/parser/ruby24.rb
                      lib/parser/ruby25.rb
                      lib/parser/ruby26.rb
+                     lib/parser/ruby27.rb
                      lib/parser/macruby.rb
                      lib/parser/rubymotion.rb)
 

lib/parser/all.rb

@@ -9,3 +9,4 @@
 require 'parser/ruby24'
 require 'parser/ruby25'
 require 'parser/ruby26'
+require 'parser/ruby27'

lib/parser/current.rb

@@ -74,6 +74,15 @@ def warn_syntax_deviation(feature, version)
     require 'parser/ruby26'
     CurrentRuby = Ruby26
 
+  when /^2\.7\./
+    current_version = '2.7.0-dev'
+    if RUBY_VERSION != current_version
+      warn_syntax_deviation 'parser/ruby27', current_version
+    end
+
+    require 'parser/ruby27'
+    CurrentRuby = Ruby27
+
   else # :nocov:
     # Keep this in sync with released Ruby.
     warn_syntax_deviation 'parser/ruby25', '2.5.x'