Extract pipeline expressions parser to a separate class

1 files changed, 25 insertions, 0 deletions

diff --git a/lib/gitlab/ci/pipeline/expression/parser.rb b/lib/gitlab/ci/pipeline/expression/parser.rb
new file mode 100644
index 00000000000..f3201ec0979
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/parser.rb
@@ -0,0 +1,25 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        class Parser
+          def initialize(syntax)
+            if syntax.is_a?(Expression::Lexer)
+              @tokens = syntax.tokens
+            else
+              @tokens = syntax.to_a
+            end
+          end
+
+          def tree
+            if @tokens.many?
+              Expression::Equals.new(@tokens.first.build, @tokens.last.build)
+            else
+              @tokens.first.build
+            end
+          end
+        end
+      end
+    end
+  end
+end