Move pipeline expression lexemes to a separate module

5 files changed, 129 insertions, 0 deletions

diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/base.rb b/lib/gitlab/ci/pipeline/expression/lexeme/base.rb
new file mode 100644
index 00000000000..29b73c94358
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/base.rb
@@ -0,0 +1,29 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class Base
+            def evaluate(**variables)
+              raise NotImplementedError
+            end
+
+            def self.build(token)
+              raise NotImplementedError
+            end
+
+            def self.type
+              self::TYPE
+            end
+
+            def self.scan(scanner)
+              if scanner.scan(self::PATTERN)
+                Expression::Token.new(scanner.matched, self)
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/equals.rb b/lib/gitlab/ci/pipeline/expression/lexeme/equals.rb
new file mode 100644
index 00000000000..0cb21131d69
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/equals.rb
@@ -0,0 +1,27 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class Equals < Lexeme::Base
+            PATTERN = /==/.freeze
+            TYPE = :operator
+
+            def initialize(left, right)
+              @left = left
+              @right = right
+            end
+
+            def evaluate(**variables)
+              @left.evaluate(variables) == @right.evaluate(variables)
+            end
+
+            def self.build(_value, behind, ahead)
+              new(behind, ahead)
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/null.rb b/lib/gitlab/ci/pipeline/expression/lexeme/null.rb
new file mode 100644
index 00000000000..21286151d79
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/null.rb
@@ -0,0 +1,22 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class Null < Lexeme::Base
+            PATTERN = /null/.freeze
+            TYPE = :value
+
+            def initialize(value = nil)
+              @value = value
+            end
+
+            def evaluate(**_)
+              nil
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/string.rb b/lib/gitlab/ci/pipeline/expression/lexeme/string.rb
new file mode 100644
index 00000000000..470a5a15cc1
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/string.rb
@@ -0,0 +1,26 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class String < Lexeme::Base
+            PATTERN = /"(?<string>.+?)"/.freeze
+            TYPE = :value
+
+            def initialize(value)
+              @value = value
+            end
+
+            def evaluate(**_)
+              @value.to_s
+            end
+
+            def self.build(string)
+              new(string.match(PATTERN)[:string])
+            end
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/variable.rb b/lib/gitlab/ci/pipeline/expression/lexeme/variable.rb
new file mode 100644
index 00000000000..5fb5dd4bbbe
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/variable.rb
@@ -0,0 +1,25 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class Variable < Lexeme::Base
+            PATTERN = /\$(?<name>\w+)/.freeze
+            TYPE = :value
+
+            def initialize(name)
+              @name = name
+            end
+
+            def evaluate(**variables)
+            end
+
+            def self.build(string)
+              new(string.match(PATTERN)[:name])
+            end
+          end
+        end
+      end
+    end
+  end
+end