{ "ordered":
  { "doc":
    [ "Collect the runfiles and artifacts of the \"srcs\" targets, keeping"
    , "record of the order of the targets (in a provider). In this way,"
    , "a sequence of files can be described at a single place and used later"
    , "in several targets where order matters and the respective provider is"
    , "supported. As this rule supports its own provider, chaining is possible."
    ]
  , "target_fields": ["srcs"]
  , "field_doc":
    { "srcs":
      [ "The files to include, in order. For targets that are defined by this"
      , "rule, the provided order in honored."
      ]
    }
  , "artifacts_doc":
    [ "The runfiles and artifacts of the \"srcs\" field."
    , "Within each target, artifacts take precedence; different targets in"
    , "the \"srcs\" field may not conflict"
    ]
  , "runfiles_doc": ["Same as artifacts"]
  , "provides_doc":
    {"keys": ["The keys of the artifacts in the intended order."]}
  , "imports": {"order": "order"}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ [ "srcs"
        , { "type": "disjoint_map_union"
          , "msg": "Sources may not conflict"
          , "$1":
            { "type": "foreach"
            , "var": "x"
            , "range": {"type": "FIELD", "name": "srcs"}
            , "body":
              { "type": "map_union"
              , "$1":
                [ {"type": "DEP_RUNFILES", "dep": {"type": "var", "name": "x"}}
                , { "type": "DEP_ARTIFACTS"
                  , "dep": {"type": "var", "name": "x"}
                  }
                ]
              }
            }
          }
        ]
      , ["order", {"type": "CALL_EXPRESSION", "name": "order"}]
      ]
    , "body":
      { "type": "RESULT"
      , "runfiles": {"type": "var", "name": "srcs"}
      , "artifacts": {"type": "var", "name": "srcs"}
      , "provides":
        { "type": "singleton_map"
        , "key": "keys"
        , "value": {"type": "var", "name": "order"}
        }
      }
    }
  }
}