{ "default_from_base":
  { "doc":
    [ "If the \"value\" is evaluated as null, the value associated to"
    , "\"key\" is retrieved from the \"base\" targets."
    ]
  , "vars": ["base", "transition", "key", "value"]
  , "imports": {"flatten_from_provides": "flatten_from_provides"}
  , "expression":
    { "type": "if"
    , "cond": {"type": "var", "name": "value"}
    , "then": {"type": "var", "name": "value"}
    , "else":
      { "type": "let*"
      , "bindings": [["range", {"type": "var", "name": "base"}]]
      , "body": {"type": "CALL_EXPRESSION", "name": "flatten_from_provides"}
      }
    }
  }
, "disjoint_map_from_provides":
  { "doc":
    [ "Performs a disjoint map union of the maps contained in the"
    , "provides map of each element in the \"range\" under the key \"key\"."
    ]
  , "vars": ["range", "transition", "key"]
  , "expression":
    { "type": "let*"
    , "bindings":
      [ [ "transition"
        , { "type": "var"
          , "name": "transition"
          , "default": {"type": "empty_map"}
          }
        ]
      ]
    , "body":
      { "type": "disjoint_map_union"
      , "$1":
        { "type": "foreach"
        , "var": "x"
        , "range": {"type": "var", "name": "range"}
        , "body":
          { "type": "DEP_PROVIDES"
          , "dep": {"type": "var", "name": "x"}
          , "provider": {"type": "var", "name": "key"}
          , "default": {"type": "empty_map"}
          , "transition": {"type": "var", "name": "transition"}
          }
        }
      }
    }
  }
, "flatten_from_provides":
  { "doc":
    [ "Flatten the lists contained in the provides map of each element"
    , "in the \"range\" under the key \"key\"."
    ]
  , "vars": ["range", "transition", "key"]
  , "expression":
    { "type": "let*"
    , "bindings":
      [ [ "transition"
        , { "type": "var"
          , "name": "transition"
          , "default": {"type": "empty_map"}
          }
        ]
      ]
    , "body":
      { "type": "++"
      , "$1":
        { "type": "foreach"
        , "var": "x"
        , "range": {"type": "var", "name": "range"}
        , "body":
          { "type": "DEP_PROVIDES"
          , "dep": {"type": "var", "name": "x"}
          , "provider": {"type": "var", "name": "key"}
          , "transition": {"type": "var", "name": "transition"}
          }
        }
      }
    }
  }
, "get_artifacts":
  { "vars": ["field_content", "transition"]
  , "expression":
    { "type": "disjoint_map_union"
    , "$1":
      { "type": "foreach"
      , "var": "x"
      , "range": {"type": "var", "name": "field_content"}
      , "body":
        { "type": "DEP_ARTIFACTS"
        , "dep": {"type": "var", "name": "x"}
        , "transition":
          { "type": "var"
          , "name": "transition"
          , "default": {"type": "empty_map"}
          }
        }
      }
    }
  }
, "get_runfiles":
  { "vars": ["field_content", "transition"]
  , "expression":
    { "type": "disjoint_map_union"
    , "$1":
      { "type": "foreach"
      , "var": "x"
      , "range": {"type": "var", "name": "field_content"}
      , "body":
        { "type": "DEP_RUNFILES"
        , "dep": {"type": "var", "name": "x"}
        , "transition":
          { "type": "var"
          , "name": "transition"
          , "default": {"type": "empty_map"}
          }
        }
      }
    }
  }
, "get_unique_artifact":
  { "doc":
    [ "Retrive the unique artifact. Asserts double checks that the"
    , "\"field_content\" evaluates to a single artifact."
    ]
  , "vars": ["field_name", "field_content", "transition"]
  , "imports": {"get_artifacts": "get_artifacts"}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ [ "_"
        , { "type": "assert_non_empty"
          , "msg":
            { "type": "join"
            , "$1":
              [ "Please define field "
              , { "type": "json_encode"
                , "$1": {"type": "var", "name": "field_name"}
                }
              , ". It cannot be empty."
              ]
            , "separator": ""
            }
          , "$1": {"type": "var", "name": "field_content"}
          }
        ]
      , ["artifacts", {"type": "CALL_EXPRESSION", "name": "get_artifacts"}]
      , [ "_"
        , { "type": "assert"
          , "msg":
            { "type": "join"
            , "$1":
              [ { "type": "json_encode"
                , "$1": {"type": "var", "name": "field_name"}
                }
              , " must evaluate to exactly one artifact but found "
              , { "type": "json_encode"
                , "$1": {"type": "var", "name": "artifacts"}
                }
              ]
            , "separator": ""
            }
          , "predicate":
            { "type": "=="
            , "$1": {"type": "length", "$1": {"type": "var", "name": "_"}}
            , "$2": 1
            }
          , "$1": {"type": "keys", "$1": {"type": "var", "name": "artifacts"}}
          }
        ]
      ]
    , "body": {"type": "var", "name": "artifacts"}
    }
  }
, "stage_unique_artifact":
  { "vars": ["artifact", "name"]
  , "expression":
    { "type": "disjoint_map_union"
    , "$1":
      { "type": "foreach"
      , "var": "x"
      , "range": {"type": "values", "$1": {"type": "var", "name": "artifact"}}
      , "body":
        { "type": "singleton_map"
        , "key": {"type": "var", "name": "name"}
        , "value": {"type": "var", "name": "x"}
        }
      }
    }
  }
}