Implement CI configuration nodes tree processing

3 files changed, 28 insertions, 4 deletions

diff --git a/lib/gitlab/ci/config/node/before_script.rb b/lib/gitlab/ci/config/node/before_script.rb
index bf73c01efbc..88ebd6bb304 100644
--- a/lib/gitlab/ci/config/node/before_script.rb
+++ b/lib/gitlab/ci/config/node/before_script.rb
@@ -3,8 +3,11 @@ module Gitlab
     class Config
       module Node
         class BeforeScript < Entry
-          def leaf?
-            true
+          def keys
+            {}
+          end
+
+          def validate!
           end
         end
       end
diff --git a/lib/gitlab/ci/config/node/entry.rb b/lib/gitlab/ci/config/node/entry.rb
index eb1b52a3e5d..6336535bc03 100644
--- a/lib/gitlab/ci/config/node/entry.rb
+++ b/lib/gitlab/ci/config/node/entry.rb
@@ -3,14 +3,32 @@ module Gitlab
     class Config
       module Node
         class Entry
+          attr_reader :hash, :config, :parent, :nodes, :errors
+
           def initialize(hash, config, parent = nil)
             @hash = hash
             @config = config
             @parent = parent
+            @nodes = {}
+            @errors = []
+          end
+
+          def process!
+            keys.each_pair do |key, entry|
+              next unless hash.include?(key)
+              @nodes[key] = entry.new(hash[key], config, self)
+            end
+
+            @nodes.values.each(&:process!)
+            @nodes.values.each(&:validate!)
+          end
+
+          def keys
+            raise NotImplementedError
           end
 
-          def allowed_keys
-            []
+          def validate!
+            raise NotImplementedError
           end
         end
       end
diff --git a/lib/gitlab/ci/config/node/global.rb b/lib/gitlab/ci/config/node/global.rb
index b3dd6df0a44..81a9d0667be 100644
--- a/lib/gitlab/ci/config/node/global.rb
+++ b/lib/gitlab/ci/config/node/global.rb
@@ -3,6 +3,9 @@ module Gitlab
     class Config
       module Node
         class Global < Entry
+          def keys
+            { before_script: BeforeScript }
+          end
         end
       end
     end