Related to #5, for compatibility with cucumber 2.x, make some

cucumber-version independent choices possible

lib/lapis_lazuli/ast.rb

@@ -0,0 +1,90 @@
+#
+# LapisLazuli
+# https://github.com/spriteCloud/lapis-lazuli
+#
+# Copyright (c) 2015 spriteCloud B.V. and other LapisLazuli contributors.
+# All rights reserved.
+#
+
+module LapisLazuli
+  ##
+  # Convenience module for dealing with aspects of the cucumber AST. From
+  # version 1.3.x to version 2.0.x, some changes were introduced here.
+  module Ast
+    ##
+    # Return a unique and human parsable ID for scenarios
+    def scenario_id(obj)
+      # For 2.0.x, the best scenario ID is one prefixed by the file name + line
+      # number, followed by the feature name, scenario name, and table data (if
+      # applicable).
+      if is_cucumber_2?(obj)
+        id = [obj.location.to_s]
+        for i in 0 .. obj.source.length - 1 do
+          part = obj.source[i]
+          if part.respond_to?(:name)
+            id << part.name
+          elsif part.is_a?(Cucumber::Core::Ast::ExamplesTable::Row)
+            id << part.values.join("|")
+          end
+        end
+        return id
+      end
+
+      case scenario
+      when Cucumber::Ast::Scenario
+        return [
+          scenario.feature.file,
+          scenario.name
+        ]
+      when Cucumber::Ast::OutlineTable::ExampleRow
+        return [
+          scenario.scenario_outline.feature.file,
+          scenario.scenario_outline.name,
+          scenario.name
+        ]
+      end
+    end
+
+
+    ##
+    # Tests whether the given scenario object indicates we're using cucumber 2.x
+    def is_cucumber_2?(obj)
+      begin
+        # The assumption - FIXME perhaps wrong - is that cucumber 1.3.x does not
+        # have this source array.
+        return (obj.respond_to?(:source) and obj.source.is_a?(Array))
+      rescue
+        return false
+      end
+    end
+
+
+    ##
+    # Tests whether the scenario object is a single scenario
+    def is_scenario?(obj)
+      begin
+        # 1.3.x
+        return obj == Cucumber::Ast::Scenario
+      rescue
+        # 2.0.x - everything is a Cucumber::Core::Test::Case
+        # Source contains a Feature and a Scenario object
+        return obj.source.length == 2
+      end
+    end
+
+
+    ##
+    # Tests whether the scenario object is a table row
+    def is_table_row?(obj)
+      begin
+        # 1.3.x
+        return obj == Cucumber::Ast::OutlineTable::ExampleRow
+      rescue
+        # 2.0.x - everything is a Cucumber::Core::Test::Case
+        # Source contains a Feature and a Scenario object, as well as an example
+        # and row object
+        return obj.source.length > 2
+      end
+    end
+  end # module Ast
+end # module LapisLazuli