diff --git a/lib/yarp.rb b/lib/yarp.rb
index d74ad47db32ca3..3ad5cc47810091 100644
--- a/lib/yarp.rb
+++ b/lib/yarp.rb
@@ -143,13 +143,14 @@ def deconstruct_keys(keys)
   # the AST, any comments that were encounters, and any errors that were
   # encountered.
   class ParseResult
-    attr_reader :value, :comments, :errors, :warnings
+    attr_reader :value, :comments, :errors, :warnings, :source
 
-    def initialize(value, comments, errors, warnings)
+    def initialize(value, comments, errors, warnings, source)
       @value = value
       @comments = comments
       @errors = errors
       @warnings = warnings
+      @source = source
     end
 
     def deconstruct_keys(keys)
@@ -224,6 +225,10 @@ def pretty_print(q)
   def self.load(source, serialized)
     Serialize.load(source, serialized)
   end
+
+  def self.newlines(source)
+    YARP.parse(source).source.offsets
+  end
 end
 
 require_relative "yarp/lex_compat"
diff --git a/lib/yarp/lex_compat.rb b/lib/yarp/lex_compat.rb
index a455d9c6fa4a6a..053b012270d56a 100644
--- a/lib/yarp/lex_compat.rb
+++ b/lib/yarp/lex_compat.rb
@@ -700,7 +700,7 @@ def result
         raise StandardError, "Lost tokens when performing lex_compat"
       end
 
-      ParseResult.new(tokens, result.comments, result.errors, result.warnings)
+      ParseResult.new(tokens, result.comments, result.errors, result.warnings, [])
     end
   end
 
diff --git a/yarp/extension.c b/yarp/extension.c
index f0d22c7f8cb2d0..034be79e4dc2cc 100644
--- a/yarp/extension.c
+++ b/yarp/extension.c
@@ -391,10 +391,11 @@ lex_input(input_t *input, const char *filepath) {
         lex_data.tokens,
         parser_comments(&parser, source),
         parser_errors(&parser, lex_data.encoding, source),
-        parser_warnings(&parser, lex_data.encoding, source)
+        parser_warnings(&parser, lex_data.encoding, source),
+        source
     };
 
-    VALUE result = rb_class_new_instance(4, result_argv, rb_cYARPParseResult);
+    VALUE result = rb_class_new_instance(5, result_argv, rb_cYARPParseResult);
 
     yp_node_destroy(&parser, node);
     yp_parser_free(&parser);
@@ -446,10 +447,11 @@ parse_input(input_t *input, const char *filepath) {
         yp_ast_new(&parser, node, encoding),
         parser_comments(&parser, source),
         parser_errors(&parser, encoding, source),
-        parser_warnings(&parser, encoding, source)
+        parser_warnings(&parser, encoding, source),
+        source
     };
 
-    VALUE result = rb_class_new_instance(4, result_argv, rb_cYARPParseResult);
+    VALUE result = rb_class_new_instance(5, result_argv, rb_cYARPParseResult);
 
     yp_node_destroy(&parser, node);
     yp_parser_free(&parser);