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INTERFACE ProcessEnv;

IMPORT TextTextTbl;

TYPE T = TextTextTbl.T;

PROCEDURE Current() : T;
  (* Get the complete environment of the current process. This will be the
     same data structure for every call, so it should be considered
     readonly. *)

PROCEDURE Copy(env : T) : T;
  (* Create a copy of environment `env'. *)

PROCEDURE SystemRepr(env : T) : REF ARRAY OF TEXT;
  (* Return the system representation of an environment, that is, an
     array of TEXT entries of the form `name=value'. This can be
     passed as parameter to Process.Create(). *)

PROCEDURE Names(env : T) : REF ARRAY OF TEXT;
  (* Return an array of all names in `env'. *)

PROCEDURE Defined(env : T; name : TEXT) : BOOLEAN;
  (* <=> Variable `name' is defined in `env' . *)

PROCEDURE Value(env : T; name : TEXT) : TEXT;
  (* Return the value of `name' in `env'. *)

PROCEDURE Set(env : T; name : TEXT; value : TEXT);
  (* Set the value of `name' in `env' to `value'. *)

PROCEDURE Delete(env : T; name : TEXT);
  (* Delete the variable `name' form `env'. *)

PROCEDURE Add(env : T; env2 : T);
  (* Add all entries from  form `env2' to `env', overiding any already
     defined ones. *)

END ProcessEnv.