1 files changed, 61 insertions, 0 deletions
diff --git a/lib/gitlab/diff/formatters/base_formatter.rb b/lib/gitlab/diff/formatters/base_formatter.rb
new file mode 100644
index 00000000000..5e923b9e602
--- /dev/null
+++ b/lib/gitlab/diff/formatters/base_formatter.rb
@@ -0,0 +1,61 @@
+module Gitlab
+  module Diff
+    module Formatters
+      class BaseFormatter
+        attr_reader :old_path
+        attr_reader :new_path
+        attr_reader :base_sha
+        attr_reader :start_sha
+        attr_reader :head_sha
+        attr_reader :position_type
+
+        def initialize(attrs)
+          if diff_file = attrs[:diff_file]
+            attrs[:diff_refs] = diff_file.diff_refs
+            attrs[:old_path] = diff_file.old_path
+            attrs[:new_path] = diff_file.new_path
+          end
+
+          if diff_refs = attrs[:diff_refs]
+            attrs[:base_sha] = diff_refs.base_sha
+            attrs[:start_sha] = diff_refs.start_sha
+            attrs[:head_sha]  = diff_refs.head_sha
+          end
+
+          @old_path = attrs[:old_path]
+          @new_path = attrs[:new_path]
+          @base_sha = attrs[:base_sha]
+          @start_sha = attrs[:start_sha]
+          @head_sha  = attrs[:head_sha]
+        end
+
+        def key
+          [base_sha, start_sha, head_sha, Digest::SHA1.hexdigest(old_path || ""), Digest::SHA1.hexdigest(new_path || "")]
+        end
+
+        def to_h
+          {
+            base_sha: base_sha,
+            start_sha: start_sha,
+            head_sha: head_sha,
+            old_path: old_path,
+            new_path: new_path,
+            position_type: position_type
+          }
+        end
+
+        def position_type
+          raise NotImplementedError
+        end
+
+        def ==(other)
+          raise NotImplementedError
+        end
+
+        def complete?
+          raise NotImplementedError
+        end
+      end
+    end
+  end
+end