[ruby/rdoc] Respect modeline to detect parser

https://github.com/ruby/rdoc/commit/485468f06f

2 files changed, 18 insertions, 3 deletions

diff --git a/lib/rdoc/parser.rb b/lib/rdoc/parser.rb
index 3bb6f5d1f2..425105effa 100644
--- a/lib/rdoc/parser.rb
+++ b/lib/rdoc/parser.rb
@@ -125,9 +125,11 @@ class RDoc::Parser
     return parser if ext_name.empty?
 
     if parser == RDoc::Parser::Simple and ext_name !~ /txt|rdoc/ then
-      case check_modeline file_name
+      case mode = check_modeline(file_name)
       when nil, 'rdoc' then # continue
-      else return nil
+      else
+        RDoc::Parser.parsers.find { |_, p| return p if mode.casecmp?(p.name[/\w+\z/]) }
+        return nil
       end
     end
 
diff --git a/test/rdoc/test_rdoc_parser.rb b/test/rdoc/test_rdoc_parser.rb
index 7cc3c2d926..a19986bd26 100644
--- a/test/rdoc/test_rdoc_parser.rb
+++ b/test/rdoc/test_rdoc_parser.rb
@@ -147,10 +147,23 @@ class TestRDocParser < RDoc::TestCase
     end
 
     assert_equal RDoc::Parser::Simple, @RP.can_parse(readme_ext)
+  end
+
+  def test_can_parse_modeline_c
+    readme_inc = File.join Dir.tmpdir, "README.inc.#{$$}"
+
+    File.open readme_inc, 'w' do |io|
+      io.puts "/* README.inc -  -*- c -*- created at: Mon Aug 7 16:45:54 JST 1995 */"
+      io.puts
+      io.puts "/* This document explains how to make extension libraries for Ruby. */"
+    end
+
+    assert_equal RDoc::Parser::C, @RP.can_parse(readme_inc)
   ensure
-    File.unlink readme_ext
+    File.unlink readme_inc
   end
 
+
   ##
   # Selenium hides a .jar file using a .txt extension.