parse.y: unindent continued line

* parse.y (tokadd_string): stop at continued line in dedented here
  documents, to dedent for each lines before removing escaped
  newlines.  [ruby-core:86236] [Bug #14621]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62872 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -5642,7 +5642,14 @@ tokadd_string(struct parser_params *p,
 	    switch (c) {
 	      case '\n':
 		if (func & STR_FUNC_QWORDS) break;
-		if (func & STR_FUNC_EXPAND) continue;
+		if (func & STR_FUNC_EXPAND) {
+		    if (!(func & STR_FUNC_INDENT) || (p->heredoc_indent < 0))
+			continue;
+		    if (c == term) {
+			c = '\\';
+			goto terminate;
+		    }
+		}
 		tokadd(p, '\\');
 		break;
 
@@ -5723,6 +5730,7 @@ tokadd_string(struct parser_params *p,
         }
 	tokadd(p, c);
     }
+  terminate:
     if (enc) *encp = enc;
     return c;
 }

test/ruby/test_syntax.rb

@@ -721,6 +721,12 @@ e"
     assert_dedented_heredoc(expected, result)
   end
 
+  def test_dedented_heredoc_continued_line
+    result = "  1\\\n" "  2\n"
+    expected = "1\\\n" "2\n"
+    assert_dedented_heredoc(expected, result)
+  end
+
   def test_lineno_after_heredoc
     bug7559 = '[ruby-dev:46737]'
     expected, _, actual = __LINE__, <<eom, __LINE__