* parse.y (lex_getline, parser_set_encode): set encoding of lines

in SCRIPT_LINES__ as source encoding.  [ruby-dev:43168]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30784 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_syntax.rb

@@ -19,4 +19,63 @@ class TestSyntax < Test::Unit::TestCase
       end
     end
   end
+
+  def test_must_ascii_compatible
+    require 'tempfile'
+    f = Tempfile.new("must_ac_")
+    Encoding.list.each do |enc|
+      next unless enc.ascii_compatible?
+      make_tmpsrc(f, "# -*- coding: #{enc.name} -*-")
+      assert_nothing_raised(ArgumentError, enc.name) {load(f.path)}
+    end
+    Encoding.list.each do |enc|
+      next if enc.ascii_compatible?
+      make_tmpsrc(f, "# -*- coding: #{enc.name} -*-")
+      assert_raise(ArgumentError, enc.name) {load(f.path)}
+    end
+    f.close!
+  end
+
+  def test_script_lines
+    require 'tempfile'
+    f = Tempfile.new("bug4361_")
+    bug4361 = '[ruby-dev:43168]'
+    with_script_lines do |debug_lines|
+      Encoding.list.each do |enc|
+        next unless enc.ascii_compatible?
+        make_tmpsrc(f, "# -*- coding: #{enc.name} -*-\n#----------------")
+        load(f.path)
+        assert_equal([f.path], debug_lines.keys)
+        assert_equal([enc, enc], debug_lines[f.path].map(&:encoding), bug4361)
+      end
+    end
+    f.close!
+  end
+
+  private
+
+  def make_tmpsrc(f, src)
+    f.open
+    f.truncate(0)
+    f.puts(src)
+    f.close
+  end
+
+  def with_script_lines
+    script_lines = nil
+    debug_lines = {}
+    Object.class_eval do
+      if defined?(SCRIPT_LINES__)
+        script_lines = SCRIPT_LINES__
+        remove_const :SCRIPT_LINES__
+      end
+      const_set(:SCRIPT_LINES__, debug_lines)
+    end
+    yield debug_lines
+  ensure
+    Object.class_eval do
+      remove_const :SCRIPT_LINES__
+      const_set(:SCRIPT_LINES__, script_lines) if script_lines
+    end
+  end
 end