{ "test":
  { "doc":
    [ "A test written in C++"
    , "FIXME: the test binary and data must be built for host"
    ]
  , "tainted": ["test"]
  , "target_fields": ["srcs", "private-hdrs", "deps", "data"]
  , "string_fields": ["name", "stage"]
  , "config_vars":
    ["CXX", "CC", "CXXFLAGS", "CFLAGS", "ENV", "CC_TEST_LAUNCHER"]
  , "implicit":
    { "defaults": [["./", "..", "defaults"]]
    , "proto-deps": []
    , "runner": ["test_runner.sh"]
    }
  , "field_doc":
    { "name":
      [ "The name of the test"
      , ""
      , "Used to name the test binary as well as for staging the test result"
      ]
    , "srcs": ["The sources of the test binary"]
    , "private-hdrs":
      [ "Any additional header files that need to be present when compiling"
      , "the test binary."
      ]
    , "stage":
      [ "The logical location of all header and source files."
      , "Individual directory components are joined with \"/\"."
      ]
    , "data": ["Any files the test binary needs access to when running"]
    }
  , "config_doc":
    { "CXX": ["The name of the C++ compiler to be used."]
    , "ENV": ["The environment for any action generated."]
    , "CXXFLAGS":
      [ "The flags for CXX to be used instead of the default ones"
      , "taken from the [\"CC\", \"defaults\"] target"
      ]
    , "CC_TEST_LAUNCHER":
      [ "List of strings representing the launcher that is prepend to the"
      , "command line for running the test binary."
      ]
    }
  , "imports":
    { "artifacts": ["./", "../..", "field_artifacts"]
    , "compile-deps": ["./", "..", "compile-deps"]
    , "link-deps": ["./", "..", "link-deps"]
    , "objects": ["./", "..", "objects"]
    , "default-CXX": ["./", "..", "default-CXX"]
    , "default-CXXFLAGS": ["./", "..", "default-CXXFLAGS"]
    , "default-ENV": ["./", "..", "default-ENV"]
    }
  , "expression":
    { "type": "let*"
    , "bindings":
      [ [ "stage"
        , { "type": "join"
          , "separator": "/"
          , "$1": {"type": "FIELD", "name": "stage"}
          }
        ]
      , [ "srcs"
        , { "type": "to_subdir"
          , "subdir": {"type": "var", "name": "stage"}
          , "$1":
            { "type": "let*"
            , "bindings": [["fieldname", "srcs"]]
            , "body": {"type": "CALL_EXPRESSION", "name": "artifacts"}
            }
          }
        ]
      , [ "local hdrs"
        , { "type": "to_subdir"
          , "subdir": {"type": "var", "name": "stage"}
          , "$1":
            { "type": "let*"
            , "bindings": [["fieldname", "private-hdrs"]]
            , "body": {"type": "CALL_EXPRESSION", "name": "artifacts"}
            }
          }
        ]
      , [ "CXX"
        , { "type": "var"
          , "name": "CXX"
          , "default": {"type": "CALL_EXPRESSION", "name": "default-CXX"}
          }
        ]
      , [ "CXXFLAGS"
        , { "type": "var"
          , "name": "CXXFLAGS"
          , "default": {"type": "CALL_EXPRESSION", "name": "default-CXXFLAGS"}
          }
        ]
      , [ "ENV"
        , { "type": "map_union"
          , "$1":
            { "type": "++"
            , "$1":
              [ {"type": "CALL_EXPRESSION", "name": "default-ENV"}
              , [ { "type": "var"
                  , "name": "ENV"
                  , "default": {"type": "empty_map"}
                  }
                ]
              ]
            }
          }
        ]
      , ["compile-deps", {"type": "CALL_EXPRESSION", "name": "compile-deps"}]
      , ["link-deps", {"type": "CALL_EXPRESSION", "name": "link-deps"}]
      , ["objects", {"type": "CALL_EXPRESSION", "name": "objects"}]
      , [ "base name"
        , { "type": "assert_non_empty"
          , "msg": "A non-empy name has to be provided"
          , "$1": {"type": "join", "$1": {"type": "FIELD", "name": "name"}}
          }
        ]
      , [ "binary name"
        , { "type": "if"
          , "cond": {"type": "var", "name": "stage"}
          , "else": {"type": "var", "name": "base name"}
          , "then":
            { "type": "join"
            , "separator": "/"
            , "$1":
              [ {"type": "var", "name": "stage"}
              , {"type": "var", "name": "base name"}
              ]
            }
          }
        ]
      , [ "link-args"
        , { "type": "nub_right"
          , "$1":
            { "type": "++"
            , "$1":
              [ {"type": "keys", "$1": {"type": "var", "name": "objects"}}
              , { "type": "++"
                , "$1":
                  { "type": "foreach"
                  , "var": "dep"
                  , "range": {"type": "FIELD", "name": "deps"}
                  , "body":
                    { "type": "DEP_PROVIDES"
                    , "dep": {"type": "var", "name": "dep"}
                    , "provider": "link-args"
                    }
                  }
                }
              ]
            }
          }
        ]
      , [ "binary"
        , { "type": "ACTION"
          , "outs": [{"type": "var", "name": "binary name"}]
          , "inputs":
            { "type": "disjoint_map_union"
            , "$1":
              [ {"type": "var", "name": "objects"}
              , {"type": "var", "name": "link-deps"}
              ]
            }
          , "cmd":
            { "type": "++"
            , "$1":
              [ [ {"type": "var", "name": "CXX"}
                , "-o"
                , {"type": "var", "name": "binary name"}
                ]
              , {"type": "var", "name": "link-args"}
              ]
            }
          , "env": {"type": "var", "name": "ENV"}
          }
        ]
      , [ "staged test binary"
        , { "type": "map_union"
          , "$1":
            { "type": "foreach_map"
            , "range": {"type": "var", "name": "binary"}
            , "var_val": "binary"
            , "body":
              { "type": "singleton_map"
              , "key": "test"
              , "value": {"type": "var", "name": "binary"}
              }
            }
          }
        ]
      , [ "runner"
        , { "type": "map_union"
          , "$1":
            { "type": "foreach"
            , "var": "runner"
            , "range": {"type": "FIELD", "name": "runner"}
            , "body":
              { "type": "map_union"
              , "$1":
                { "type": "foreach"
                , "var": "runner"
                , "range":
                  { "type": "values"
                  , "$1":
                    { "type": "DEP_ARTIFACTS"
                    , "dep": {"type": "var", "name": "runner"}
                    }
                  }
                , "body":
                  { "type": "singleton_map"
                  , "key": "runner.sh"
                  , "value": {"type": "var", "name": "runner"}
                  }
                }
              }
            }
          }
        ]
      , [ "data"
        , { "type": "disjoint_map_union"
          , "msg": "Data runfiles may not conflict"
          , "$1":
            { "type": "foreach"
            , "var": "dep"
            , "range": {"type": "FIELD", "name": "data"}
            , "body":
              {"type": "DEP_RUNFILES", "dep": {"type": "var", "name": "dep"}}
            }
          }
        ]
      , [ "test-results"
        , { "type": "ACTION"
          , "outs": ["result", "stdout", "stderr", "time-start", "time-stop"]
          , "inputs":
            { "type": "map_union"
            , "$1":
              [ { "type": "to_subdir"
                , "subdir": "work"
                , "$1": {"type": "var", "name": "data"}
                }
              , {"type": "var", "name": "runner"}
              , {"type": "var", "name": "staged test binary"}
              ]
            }
          , "cmd":
            { "type": "++"
            , "$1":
              [ ["sh", "./runner.sh"]
              , {"type": "var", "name": "CC_TEST_LAUNCHER", "default": []}
              ]
            }
          , "may_fail": ["test"]
          , "fail_message":
            { "type": "join"
            , "$1":
              ["CC test ", {"type": "var", "name": "binary name"}, " failed"]
            }
          }
        ]
      , [ "runfiles"
        , { "type": "singleton_map"
          , "key": {"type": "var", "name": "base name"}
          , "value":
            {"type": "TREE", "$1": {"type": "var", "name": "test-results"}}
          }
        ]
      ]
    , "body":
      { "type": "RESULT"
      , "artifacts": {"type": "var", "name": "test-results"}
      , "runfiles": {"type": "var", "name": "runfiles"}
      }
    }
  }
}