src/Pure/type.ML
author blanchet
Thu, 16 Dec 2010 22:45:02 +0100
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parent 39997 b654fa27fbc4
child 41254 78c3e472bb35
permissions -rw-r--r--
discriminate SMT errors a bit better
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(*  Title:      Pure/type.ML
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    Author:     Tobias Nipkow, Lawrence C Paulson, and Markus Wenzel
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Type signatures and certified types, special treatment of type vars,
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matching and unification of types, extend and merge type signatures.
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*)
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signature TYPE =
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sig
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  (*constraints*)
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  val mark_polymorphic: typ -> typ
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  val constraint: typ -> term -> term
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  val strip_constraints: term -> term
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  val appl_error: Pretty.pp -> term -> typ -> term -> typ -> string
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  (*type signatures and certified types*)
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  datatype decl =
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    LogicalType of int |
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    Abbreviation of string list * typ * bool |
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    Nonterminal
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  type tsig
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  val eq_tsig: tsig * tsig -> bool
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  val rep_tsig: tsig ->
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   {classes: Name_Space.T * Sorts.algebra,
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    default: sort,
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    types: decl Name_Space.table,
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    log_types: string list}
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  val empty_tsig: tsig
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  val class_space: tsig -> Name_Space.T
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  val class_alias: Name_Space.naming -> binding -> string -> tsig -> tsig
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  val intern_class: tsig -> xstring -> string
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  val extern_class: tsig -> string -> xstring
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  val defaultS: tsig -> sort
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  val logical_types: tsig -> string list
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  val eq_sort: tsig -> sort * sort -> bool
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  val subsort: tsig -> sort * sort -> bool
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  val of_sort: tsig -> typ * sort -> bool
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  val inter_sort: tsig -> sort * sort -> sort
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  val cert_class: tsig -> class -> class
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  val cert_sort: tsig -> sort -> sort
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  val minimize_sort: tsig -> sort -> sort
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  val witness_sorts: tsig -> (typ * sort) list -> sort list -> (typ * sort) list
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  type mode
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  val mode_default: mode
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  val mode_syntax: mode
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  val mode_abbrev: mode
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  val get_mode: Proof.context -> mode
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  val set_mode: mode -> Proof.context -> Proof.context
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  val restore_mode: Proof.context -> Proof.context -> Proof.context
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  val type_space: tsig -> Name_Space.T
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  val type_alias: Name_Space.naming -> binding -> string -> tsig -> tsig
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  val intern_type: tsig -> xstring -> string
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  val extern_type: tsig -> string -> xstring
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  val is_logtype: tsig -> string -> bool
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  val the_decl: tsig -> string -> decl
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  val cert_typ_mode: mode -> tsig -> typ -> typ
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  val cert_typ: tsig -> typ -> typ
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  val arity_number: tsig -> string -> int
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  val arity_sorts: Pretty.pp -> tsig -> string -> sort -> sort list
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  (*special treatment of type vars*)
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  val sort_of_atyp: typ -> sort
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  val strip_sorts: typ -> typ
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  val no_tvars: typ -> typ
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  val varify_global: (string * sort) list -> term -> ((string * sort) * indexname) list * term
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  val legacy_freeze_thaw_type: typ -> typ * (typ -> typ)
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  val legacy_freeze_type: typ -> typ
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  val legacy_freeze_thaw: term -> term * (term -> term)
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  val legacy_freeze: term -> term
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  (*matching and unification*)
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  exception TYPE_MATCH
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  type tyenv = (sort * typ) Vartab.table
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  val lookup: tyenv -> indexname * sort -> typ option
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  val devar: tyenv -> typ -> typ
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  val typ_match: tsig -> typ * typ -> tyenv -> tyenv
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  val typ_instance: tsig -> typ * typ -> bool
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  val raw_match: typ * typ -> tyenv -> tyenv
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  val raw_matches: typ list * typ list -> tyenv -> tyenv
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  val raw_instance: typ * typ -> bool
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  exception TUNIFY
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  val unify: tsig -> typ * typ -> tyenv * int -> tyenv * int
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  val raw_unify: typ * typ -> tyenv -> tyenv
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  val raw_unifys: typ list * typ list -> tyenv -> tyenv
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  val could_unify: typ * typ -> bool
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  val could_unifys: typ list * typ list -> bool
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  val eq_type: tyenv -> typ * typ -> bool
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  (*extend and merge type signatures*)
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  val add_class: Pretty.pp -> Name_Space.naming -> binding * class list -> tsig -> tsig
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  val hide_class: bool -> string -> tsig -> tsig
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  val set_defsort: sort -> tsig -> tsig
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  val add_type: Name_Space.naming -> binding * int -> tsig -> tsig
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  val add_abbrev: Name_Space.naming -> binding * string list * typ -> tsig -> tsig
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  val add_nonterminal: Name_Space.naming -> binding -> tsig -> tsig
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  val hide_type: bool -> string -> tsig -> tsig
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  val add_arity: Pretty.pp -> arity -> tsig -> tsig
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  val add_classrel: Pretty.pp -> class * class -> tsig -> tsig
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  val merge_tsig: Pretty.pp -> tsig * tsig -> tsig
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end;
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structure Type: TYPE =
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struct
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(** constraints **)
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(*indicate polymorphic Vars*)
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fun mark_polymorphic T = Type ("_polymorphic_", [T]);
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fun constraint T t =
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  if T = dummyT then t
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  else Const ("_type_constraint_", T --> T) $ t;
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fun strip_constraints (Const ("_type_constraint_", _) $ t) = strip_constraints t
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  | strip_constraints (t $ u) = strip_constraints t $ strip_constraints u
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  | strip_constraints (Abs (x, T, t)) = Abs (x, T, strip_constraints t)
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  | strip_constraints a = a;
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fun appl_error pp (Const ("_type_constraint_", Type ("fun", [T, _]))) _ u U =
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      cat_lines
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       ["Failed to meet type constraint:", "",
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        Pretty.string_of (Pretty.block
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         [Pretty.str "Term:", Pretty.brk 2, Pretty.term pp u,
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          Pretty.str " ::", Pretty.brk 1, Pretty.typ pp U]),
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        Pretty.string_of (Pretty.block
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         [Pretty.str "Type:", Pretty.brk 2, Pretty.typ pp T])]
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  | appl_error pp t T u U =
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      cat_lines
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       ["Type error in application: " ^
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          (case T of
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            Type ("fun", _) => "incompatible operand type"
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          | _ => "operator not of function type"),
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        "",
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        Pretty.string_of (Pretty.block
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          [Pretty.str "Operator:", Pretty.brk 2, Pretty.term pp t,
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            Pretty.str " ::", Pretty.brk 1, Pretty.typ pp T]),
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        Pretty.string_of (Pretty.block
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          [Pretty.str "Operand:", Pretty.brk 3, Pretty.term pp u,
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            Pretty.str " ::", Pretty.brk 1, Pretty.typ pp U])];
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(** type signatures and certified types **)
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(* type declarations *)
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datatype decl =
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  LogicalType of int |
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  Abbreviation of string list * typ * bool |
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  Nonterminal;
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(* type tsig *)
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datatype tsig =
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  TSig of {
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    classes: Name_Space.T * Sorts.algebra,  (*order-sorted algebra of type classes*)
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    default: sort,                          (*default sort on input*)
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    types: decl Name_Space.table,           (*declared types*)
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    log_types: string list};                (*logical types sorted by number of arguments*)
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fun eq_tsig
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   (TSig {classes = classes1, default = default1, types = types1, log_types = _},
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    TSig {classes = classes2, default = default2, types = types2, log_types = _}) =
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  pointer_eq (classes1, classes2) andalso
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  default1 = default2 andalso
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  pointer_eq (types1, types2);
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fun rep_tsig (TSig comps) = comps;
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fun make_tsig (classes, default, types, log_types) =
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  TSig {classes = classes, default = default, types = types, log_types = log_types};
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fun build_tsig (classes, default, types) =
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  let
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    val log_types =
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      Symtab.fold (fn (c, LogicalType n) => cons (c, n) | _ => I) (snd types) []
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      |> Library.sort (int_ord o pairself snd) |> map fst;
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  in make_tsig (classes, default, types, log_types) end;
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fun map_tsig f (TSig {classes, default, types, log_types = _}) =
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  build_tsig (f (classes, default, types));
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val empty_tsig =
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  build_tsig ((Name_Space.empty "class", Sorts.empty_algebra), [], Name_Space.empty_table "type");
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(* classes and sorts *)
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val class_space = #1 o #classes o rep_tsig;
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fun class_alias naming binding name = map_tsig (fn ((space, classes), default, types) =>
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  ((Name_Space.alias naming binding name space, classes), default, types));
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val intern_class = Name_Space.intern o class_space;
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val extern_class = Name_Space.extern o class_space;
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fun defaultS (TSig {default, ...}) = default;
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fun logical_types (TSig {log_types, ...}) = log_types;
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fun eq_sort (TSig {classes, ...}) = Sorts.sort_eq (#2 classes);
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fun subsort (TSig {classes, ...}) = Sorts.sort_le (#2 classes);
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fun of_sort (TSig {classes, ...}) = Sorts.of_sort (#2 classes);
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fun inter_sort (TSig {classes, ...}) = Sorts.inter_sort (#2 classes);
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fun cert_class (TSig {classes, ...}) = Sorts.certify_class (#2 classes);
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fun cert_sort (TSig {classes, ...}) = Sorts.certify_sort (#2 classes);
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fun minimize_sort (TSig {classes, ...}) = Sorts.minimize_sort (#2 classes);
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fun witness_sorts (TSig {classes, log_types, ...}) =
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  Sorts.witness_sorts (#2 classes) log_types;
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(* certification mode *)
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datatype mode = Mode of {normalize: bool, logical: bool};
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val mode_default = Mode {normalize = true, logical = true};
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val mode_syntax = Mode {normalize = true, logical = false};
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val mode_abbrev = Mode {normalize = false, logical = false};
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structure Mode = Proof_Data
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(
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  type T = mode;
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  fun init _ = mode_default;
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);
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val get_mode = Mode.get;
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fun set_mode mode = Mode.map (K mode);
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fun restore_mode ctxt = set_mode (get_mode ctxt);
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(* types *)
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val type_space = #1 o #types o rep_tsig;
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fun type_alias naming binding name = map_tsig (fn (classes, default, (space, types)) =>
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  (classes, default, (Name_Space.alias naming binding name space, types)));
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val intern_type = Name_Space.intern o type_space;
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val extern_type = Name_Space.extern o type_space;
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val is_logtype = member (op =) o logical_types;
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fun undecl_type c = "Undeclared type constructor: " ^ quote c;
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fun lookup_type (TSig {types = (_, types), ...}) = Symtab.lookup types;
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fun the_decl tsig c =
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  (case lookup_type tsig c of
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    NONE => error (undecl_type c)
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  | SOME decl => decl);
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(* certified types *)
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fun bad_nargs t = "Bad number of arguments for type constructor: " ^ quote t;
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14998
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local
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fun inst_typ env (Type (c, Ts)) = Type (c, map (inst_typ env) Ts)
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  | inst_typ env (T as TFree (x, _)) = the_default T (AList.lookup (op =) env x)
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  | inst_typ _ T = T;
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in
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cb9236269af1 type mode: models certification mode (default, syntax, abbrev);
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fun cert_typ_mode (Mode {normalize, logical}) tsig ty =
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  let
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    fun err msg = raise TYPE (msg, [ty], []);
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    val check_logical =
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      if logical then fn c => err ("Illegal occurrence of syntactic type: " ^ quote c)
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      else fn _ => ();
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    fun cert (T as Type (c, Ts)) =
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          let
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            val Ts' = map cert Ts;
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            fun nargs n = if length Ts <> n then err (bad_nargs c) else ();
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          in
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            (case the_decl tsig c of
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              LogicalType n => (nargs n; Type (c, Ts'))
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            | Abbreviation (vs, U, syn) =>
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               (nargs (length vs);
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                if syn then check_logical c else ();
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                if normalize then inst_typ (vs ~~ Ts') U
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                else Type (c, Ts'))
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            | Nonterminal => (nargs 0; check_logical c; T))
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          end
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      | cert (TFree (x, S)) = TFree (x, cert_sort tsig S)
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      | cert (TVar (xi as (_, i), S)) =
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          if i < 0 then
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            err ("Malformed type variable: " ^ quote (Term.string_of_vname xi))
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          else TVar (xi, cert_sort tsig S);
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    val ty' = cert ty;
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  in if ty = ty' then ty else ty' end;  (*avoid copying of already normal type*)
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val cert_typ = cert_typ_mode mode_default;
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14998
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end;
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(* type arities *)
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fun arity_number tsig a =
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  (case lookup_type tsig a of
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    SOME (LogicalType n) => n
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  | _ => error (undecl_type a));
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fun arity_sorts _ tsig a [] = replicate (arity_number tsig a) []
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  | arity_sorts pp (TSig {classes, ...}) a S = Sorts.mg_domain (#2 classes) a S
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      handle Sorts.CLASS_ERROR err => error (Sorts.class_error pp err);
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(** special treatment of type vars **)
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(* sort_of_atyp *)
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fun sort_of_atyp (TFree (_, S)) = S
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  | sort_of_atyp (TVar (_, S)) = S
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  | sort_of_atyp T = raise TYPE ("sort_of_atyp", [T], []);
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(* strip_sorts *)
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fun strip_sorts (Type (a, Ts)) = Type (a, map strip_sorts Ts)
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  | strip_sorts (TFree (x, _)) = TFree (x, [])
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  | strip_sorts (TVar (xi, _)) = TVar (xi, []);
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(* no_tvars *)
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fun no_tvars T =
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  (case Term.add_tvarsT T [] of [] => T
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  | vs => raise TYPE ("Illegal schematic type variable(s): " ^
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      commas_quote (map (Term.string_of_vname o #1) (rev vs)), [T], []));
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(* varify_global *)
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fun varify_global fixed t =
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  let
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    val fs = Term.fold_types (Term.fold_atyps
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      (fn TFree v => if member (op =) fixed v then I else insert (op =) v | _ => I)) t [];
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    val used = Name.context
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      |> fold_types (fold_atyps (fn TVar ((a, _), _) => Name.declare a | _ => I)) t;
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    val fmap = fs ~~ map (rpair 0) (#1 (Name.variants (map fst fs) used));
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    fun thaw (f as (_, S)) =
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      (case AList.lookup (op =) fmap f of
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        NONE => TFree f
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      | SOME xi => TVar (xi, S));
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  in (fmap, map_types (map_type_tfree thaw) t) end;
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557a11310988 moved classes / sorts to sorts.ML;
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(* freeze_thaw: freeze TVars in a term; return the "thaw" inverse *)
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   357
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local
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   359
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   360
fun new_name (ix, (pairs, used)) =
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  let val v = Name.variant used (string_of_indexname ix)
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   362
  in ((ix, v) :: pairs, v :: used) end;
621
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   363
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958207815931 added Type.freeze(_type);
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   364
fun freeze_one alist (ix, sort) =
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   365
  TFree (the (AList.lookup (op =) alist ix), sort)
15531
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   366
    handle Option =>
3790
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   367
      raise TYPE ("Failure during freezing of ?" ^ string_of_indexname ix, [], []);
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   368
17184
3d80209e9a53 use AList operations;
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   369
fun thaw_one alist (a, sort) = TVar (the (AList.lookup (op =) alist a), sort)
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   370
  handle Option => TFree (a, sort);
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12f9f36e4484 restored functor sig;
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   371
10495
284ee538991c export freeze_thaw_type;
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   372
in
284ee538991c export freeze_thaw_type;
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   373
33832
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   374
fun legacy_freeze_thaw_type T =
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  let
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   376
    val used = OldTerm.add_typ_tfree_names (T, [])
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    and tvars = map #1 (OldTerm.add_typ_tvars (T, []));
23178
07ba6b58b3d2 simplified/unified list fold;
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    val (alist, _) = List.foldr new_name ([], used) tvars;
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  in (map_type_tvar (freeze_one alist) T, map_type_tfree (thaw_one (map swap alist))) end;
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   381
val legacy_freeze_type = #1 o legacy_freeze_thaw_type;
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   382
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cff42395c246 explicitly mark some legacy freeze operations;
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   383
fun legacy_freeze_thaw t =
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diff changeset
   384
  let
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diff changeset
   385
    val used = OldTerm.it_term_types OldTerm.add_typ_tfree_names (t, [])
9fa69e3858d6 moved old add_type_XXX, add_term_XXX etc. to structure OldTerm;
wenzelm
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diff changeset
   386
    and tvars = map #1 (OldTerm.it_term_types OldTerm.add_typ_tvars (t, []));
23178
07ba6b58b3d2 simplified/unified list fold;
wenzelm
parents: 21934
diff changeset
   387
    val (alist, _) = List.foldr new_name ([], used) tvars;
7641
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diff changeset
   388
  in
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wenzelm
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diff changeset
   389
    (case alist of
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diff changeset
   390
      [] => (t, fn x => x) (*nothing to do!*)
20548
8ef25fe585a8 renamed Term.map_term_types to Term.map_types (cf. Term.fold_types);
wenzelm
parents: 20071
diff changeset
   391
    | _ => (map_types (map_type_tvar (freeze_one alist)) t,
8ef25fe585a8 renamed Term.map_term_types to Term.map_types (cf. Term.fold_types);
wenzelm
parents: 20071
diff changeset
   392
      map_types (map_type_tfree (thaw_one (map swap alist)))))
7641
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diff changeset
   393
  end;
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diff changeset
   394
33832
cff42395c246 explicitly mark some legacy freeze operations;
wenzelm
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diff changeset
   395
val legacy_freeze = #1 o legacy_freeze_thaw;
16289
958207815931 added Type.freeze(_type);
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diff changeset
   396
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diff changeset
   397
end;
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diff changeset
   398
256
b401c3d06024 (this is a preliminary release)
wenzelm
parents: 200
diff changeset
   399
b401c3d06024 (this is a preliminary release)
wenzelm
parents: 200
diff changeset
   400
14790
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diff changeset
   401
(** matching and unification of types **)
8899
99266fe189a1 removed is_type_abbr;
wenzelm
parents: 8721
diff changeset
   402
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   403
type tyenv = (sort * typ) Vartab.table;
256
b401c3d06024 (this is a preliminary release)
wenzelm
parents: 200
diff changeset
   404
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   405
fun tvar_clash ixn S S' = raise TYPE ("Type variable " ^
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   406
  quote (Term.string_of_vname ixn) ^ " has two distinct sorts",
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   407
  [TVar (ixn, S), TVar (ixn, S')], []);
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   408
26327
fc8df36e2644 Type.lookup now curried; typ_of_sort
haftmann
parents: 25384
diff changeset
   409
fun lookup tye (ixn, S) =
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   410
  (case Vartab.lookup tye ixn of
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   411
    NONE => NONE
16289
958207815931 added Type.freeze(_type);
wenzelm
parents: 15797
diff changeset
   412
  | SOME (S', T) => if S = S' then SOME T else tvar_clash ixn S S');
958207815931 added Type.freeze(_type);
wenzelm
parents: 15797
diff changeset
   413
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   414
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   415
(* matching *)
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   416
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   417
exception TYPE_MATCH;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   418
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   419
fun typ_match tsig =
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   420
  let
39997
b654fa27fbc4 prevention of self-referential type environments
paulson
parents: 39292
diff changeset
   421
    fun match (T0 as TVar (v, S), T) subs = 
26327
fc8df36e2644 Type.lookup now curried; typ_of_sort
haftmann
parents: 25384
diff changeset
   422
          (case lookup subs (v, S) of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14998
diff changeset
   423
            NONE =>
39997
b654fa27fbc4 prevention of self-referential type environments
paulson
parents: 39292
diff changeset
   424
              if of_sort tsig (T, S) 
b654fa27fbc4 prevention of self-referential type environments
paulson
parents: 39292
diff changeset
   425
              then if T0 = T then subs (*types already identical; don't create cycle!*)
b654fa27fbc4 prevention of self-referential type environments
paulson
parents: 39292
diff changeset
   426
                   else Vartab.update_new (v, (S, T)) subs
14993
802f3732a54e tuned certify_typ/term;
wenzelm
parents: 14989
diff changeset
   427
              else raise TYPE_MATCH
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14998
diff changeset
   428
          | SOME U => if U = T then subs else raise TYPE_MATCH)
16340
fd027bb32896 renamed cert_typ_raw to cert_typ_abbrev;
wenzelm
parents: 16289
diff changeset
   429
      | match (Type (a, Ts), Type (b, Us)) subs =
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   430
          if a <> b then raise TYPE_MATCH
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   431
          else matches (Ts, Us) subs
16340
fd027bb32896 renamed cert_typ_raw to cert_typ_abbrev;
wenzelm
parents: 16289
diff changeset
   432
      | match (TFree x, TFree y) subs =
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   433
          if x = y then subs else raise TYPE_MATCH
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   434
      | match _ _ = raise TYPE_MATCH
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   435
    and matches (T :: Ts, U :: Us) subs = matches (Ts, Us) (match (T, U) subs)
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   436
      | matches _ subs = subs;
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   437
  in match end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   438
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   439
fun typ_instance tsig (T, U) =
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   440
  (typ_match tsig (U, T) Vartab.empty; true) handle TYPE_MATCH => false;
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   441
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   442
(*purely structural matching*)
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   443
fun raw_match (TVar (v, S), T) subs =
26327
fc8df36e2644 Type.lookup now curried; typ_of_sort
haftmann
parents: 25384
diff changeset
   444
      (case lookup subs (v, S) of
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   445
        NONE => Vartab.update_new (v, (S, T)) subs
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   446
      | SOME U => if U = T then subs else raise TYPE_MATCH)
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   447
  | raw_match (Type (a, Ts), Type (b, Us)) subs =
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   448
      if a <> b then raise TYPE_MATCH
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   449
      else raw_matches (Ts, Us) subs
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   450
  | raw_match (TFree x, TFree y) subs =
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   451
      if x = y then subs else raise TYPE_MATCH
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   452
  | raw_match _ _ = raise TYPE_MATCH
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   453
and raw_matches (T :: Ts, U :: Us) subs = raw_matches (Ts, Us) (raw_match (T, U) subs)
19694
08894a78400b export raw_matches;
wenzelm
parents: 19642
diff changeset
   454
  | raw_matches ([], []) subs = subs
08894a78400b export raw_matches;
wenzelm
parents: 19642
diff changeset
   455
  | raw_matches _ _ = raise TYPE_MATCH;
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   456
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   457
fun raw_instance (T, U) =
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   458
  (raw_match (U, T) Vartab.empty; true) handle TYPE_MATCH => false;
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   459
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   460
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   461
(* unification *)
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   462
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   463
exception TUNIFY;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   464
26641
cf67665296c2 tsig: removed unnecessary universal witness;
wenzelm
parents: 26517
diff changeset
   465
(*occurs check*)
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   466
fun occurs v tye =
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   467
  let
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   468
    fun occ (Type (_, Ts)) = exists occ Ts
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   469
      | occ (TFree _) = false
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   470
      | occ (TVar (w, S)) =
29269
5c25a2012975 moved term order operations to structure TermOrd (cf. Pure/term_ord.ML);
wenzelm
parents: 29260
diff changeset
   471
          Term.eq_ix (v, w) orelse
26327
fc8df36e2644 Type.lookup now curried; typ_of_sort
haftmann
parents: 25384
diff changeset
   472
            (case lookup tye (w, S) of
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14998
diff changeset
   473
              NONE => false
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14998
diff changeset
   474
            | SOME U => occ U);
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   475
  in occ end;
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   476
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   477
(*chase variable assignments; if devar returns a type var then it must be unassigned*)
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   478
fun devar tye (T as TVar v) =
26327
fc8df36e2644 Type.lookup now curried; typ_of_sort
haftmann
parents: 25384
diff changeset
   479
      (case lookup tye v of
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   480
        SOME U => devar tye U
15531
08c8dad8e399 Deleted Library.option type.
skalberg
parents: 14998
diff changeset
   481
      | NONE => T)
32784
1a5dde5079ac eliminated redundant bindings;
wenzelm
parents: 32738
diff changeset
   482
  | devar _ T = T;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   483
17804
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   484
(*order-sorted unification*)
32784
1a5dde5079ac eliminated redundant bindings;
wenzelm
parents: 32738
diff changeset
   485
fun unify (TSig {classes = (_, classes), ...}) TU (tyenv, maxidx) =
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   486
  let
32738
15bb09ca0378 explicit indication of Unsynchronized.ref;
wenzelm
parents: 32648
diff changeset
   487
    val tyvar_count = Unsynchronized.ref maxidx;
15bb09ca0378 explicit indication of Unsynchronized.ref;
wenzelm
parents: 32648
diff changeset
   488
    fun gen_tyvar S = TVar ((Name.aT, Unsynchronized.inc tyvar_count), S);
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   489
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   490
    fun mg_domain a S = Sorts.mg_domain classes a S
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   491
      handle Sorts.CLASS_ERROR _ => raise TUNIFY;
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   492
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   493
    fun meet (_, []) tye = tye
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   494
      | meet (TVar (xi, S'), S) tye =
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   495
          if Sorts.sort_le classes (S', S) then tye
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   496
          else Vartab.update_new
17221
6cd180204582 curried_lookup/update;
wenzelm
parents: 17184
diff changeset
   497
            (xi, (S', gen_tyvar (Sorts.inter_sort classes (S', S)))) tye
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   498
      | meet (TFree (_, S'), S) tye =
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   499
          if Sorts.sort_le classes (S', S) then tye
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   500
          else raise TUNIFY
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   501
      | meet (Type (a, Ts), S) tye = meets (Ts, mg_domain a S) tye
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   502
    and meets (T :: Ts, S :: Ss) tye = meets (Ts, Ss) (meet (devar tye T, S) tye)
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   503
      | meets _ tye = tye;
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   504
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   505
    fun unif (ty1, ty2) tye =
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   506
      (case (devar tye ty1, devar tye ty2) of
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   507
        (T as TVar (v, S1), U as TVar (w, S2)) =>
29269
5c25a2012975 moved term order operations to structure TermOrd (cf. Pure/term_ord.ML);
wenzelm
parents: 29260
diff changeset
   508
          if Term.eq_ix (v, w) then
15797
a63605582573 - Eliminated nodup_vars check.
berghofe
parents: 15574
diff changeset
   509
            if S1 = S2 then tye else tvar_clash v S1 S2
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   510
          else if Sorts.sort_le classes (S1, S2) then
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   511
            Vartab.update_new (w, (S2, T)) tye
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   512
          else if Sorts.sort_le classes (S2, S1) then
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   513
            Vartab.update_new (v, (S1, U)) tye
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   514
          else
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   515
            let val S = gen_tyvar (Sorts.inter_sort classes (S1, S2)) in
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   516
              Vartab.update_new (v, (S1, S)) (Vartab.update_new (w, (S2, S)) tye)
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   517
            end
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   518
      | (TVar (v, S), T) =>
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   519
          if occurs v tye T then raise TUNIFY
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   520
          else meet (T, S) (Vartab.update_new (v, (S, T)) tye)
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   521
      | (T, TVar (v, S)) =>
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   522
          if occurs v tye T then raise TUNIFY
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   523
          else meet (T, S) (Vartab.update_new (v, (S, T)) tye)
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   524
      | (Type (a, Ts), Type (b, Us)) =>
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   525
          if a <> b then raise TUNIFY
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   526
          else unifs (Ts, Us) tye
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   527
      | (T, U) => if T = U then tye else raise TUNIFY)
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   528
    and unifs (T :: Ts, U :: Us) tye = unifs (Ts, Us) (unif (T, U) tye)
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   529
      | unifs _ tye = tye;
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   530
  in (unif TU tyenv, ! tyvar_count) end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   531
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   532
(*purely structural unification*)
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   533
fun raw_unify (ty1, ty2) tye =
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   534
  (case (devar tye ty1, devar tye ty2) of
32784
1a5dde5079ac eliminated redundant bindings;
wenzelm
parents: 32738
diff changeset
   535
    (T as TVar (v, S1), TVar (w, S2)) =>
29269
5c25a2012975 moved term order operations to structure TermOrd (cf. Pure/term_ord.ML);
wenzelm
parents: 29260
diff changeset
   536
      if Term.eq_ix (v, w) then
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   537
        if S1 = S2 then tye else tvar_clash v S1 S2
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   538
      else Vartab.update_new (w, (S2, T)) tye
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   539
  | (TVar (v, S), T) =>
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   540
      if occurs v tye T then raise TUNIFY
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   541
      else Vartab.update_new (v, (S, T)) tye
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   542
  | (T, TVar (v, S)) =>
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   543
      if occurs v tye T then raise TUNIFY
17412
e26cb20ef0cc TableFun/Symtab: curried lookup and update;
wenzelm
parents: 17221
diff changeset
   544
      else Vartab.update_new (v, (S, T)) tye
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   545
  | (Type (a, Ts), Type (b, Us)) =>
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   546
      if a <> b then raise TUNIFY
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   547
      else raw_unifys (Ts, Us) tye
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   548
  | (T, U) => if T = U then tye else raise TUNIFY)
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   549
and raw_unifys (T :: Ts, U :: Us) tye = raw_unifys (Ts, Us) (raw_unify (T, U) tye)
19696
26a268c299d8 export raw_unifys, could_unifys;
wenzelm
parents: 19694
diff changeset
   550
  | raw_unifys ([], []) tye = tye
26a268c299d8 export raw_unifys, could_unifys;
wenzelm
parents: 19694
diff changeset
   551
  | raw_unifys _ _ = raise TUNIFY;
16946
7f9a7fe413f3 typ_match, unify: canonical argument order;
wenzelm
parents: 16885
diff changeset
   552
17804
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   553
(*fast unification filter*)
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   554
fun could_unify (Type (a, Ts), Type (b, Us)) = a = b andalso could_unifys (Ts, Us)
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   555
  | could_unify (TFree (a, _), TFree (b, _)) = a = b
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   556
  | could_unify (TVar _, _) = true
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   557
  | could_unify (_, TVar _) = true
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   558
  | could_unify _ = false
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   559
and could_unifys (T :: Ts, U :: Us) = could_unify (T, U) andalso could_unifys (Ts, Us)
19696
26a268c299d8 export raw_unifys, could_unifys;
wenzelm
parents: 19694
diff changeset
   560
  | could_unifys ([], []) = true
26a268c299d8 export raw_unifys, could_unifys;
wenzelm
parents: 19694
diff changeset
   561
  | could_unifys _ = false;
450
382b5368ec21 added raw_unify;
wenzelm
parents: 422
diff changeset
   562
17804
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   563
4deae4b33d97 added could_unify;
wenzelm
parents: 17756
diff changeset
   564
(*equality with respect to a type environment*)
32030
49d7d0bb90c6 eq_type: special case for empty environment;
wenzelm
parents: 31946
diff changeset
   565
fun equal_type tye (T, T') =
16885
cabcd33cde18 tuned match, unify;
wenzelm
parents: 16650
diff changeset
   566
  (case (devar tye T, devar tye T') of
16650
bd4f7149ba1e Moved eq_type from envir.ML to type.ML
berghofe
parents: 16444
diff changeset
   567
     (Type (s, Ts), Type (s', Ts')) =>
32030
49d7d0bb90c6 eq_type: special case for empty environment;
wenzelm
parents: 31946
diff changeset
   568
       s = s' andalso ListPair.all (equal_type tye) (Ts, Ts')
16650
bd4f7149ba1e Moved eq_type from envir.ML to type.ML
berghofe
parents: 16444
diff changeset
   569
   | (U, U') => U = U');
bd4f7149ba1e Moved eq_type from envir.ML to type.ML
berghofe
parents: 16444
diff changeset
   570
32030
49d7d0bb90c6 eq_type: special case for empty environment;
wenzelm
parents: 31946
diff changeset
   571
fun eq_type tye =
49d7d0bb90c6 eq_type: special case for empty environment;
wenzelm
parents: 31946
diff changeset
   572
  if Vartab.is_empty tye then op = else equal_type tye;
49d7d0bb90c6 eq_type: special case for empty environment;
wenzelm
parents: 31946
diff changeset
   573
450
382b5368ec21 added raw_unify;
wenzelm
parents: 422
diff changeset
   574
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   575
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   576
(** extend and merge type signatures **)
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   577
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   578
(* classes *)
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   579
16370
033d890fe91f name space of classes and types maintained in tsig;
wenzelm
parents: 16340
diff changeset
   580
fun add_class pp naming (c, cs) tsig =
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   581
  tsig |> map_tsig (fn ((space, classes), default, types) =>
16370
033d890fe91f name space of classes and types maintained in tsig;
wenzelm
parents: 16340
diff changeset
   582
    let
033d890fe91f name space of classes and types maintained in tsig;
wenzelm
parents: 16340
diff changeset
   583
      val cs' = map (cert_class tsig) cs
033d890fe91f name space of classes and types maintained in tsig;
wenzelm
parents: 16340
diff changeset
   584
        handle TYPE (msg, _, _) => error msg;
33095
bbd52d2f8696 renamed NameSpace to Name_Space -- also to emphasize its subtle change in semantics;
wenzelm
parents: 33094
diff changeset
   585
      val (c', space') = space |> Name_Space.declare true naming c;
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   586
      val classes' = classes |> Sorts.add_class pp (c', cs');
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   587
    in ((space', classes'), default, types) end);
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   588
26669
c27efd6de25d simplified hide_XXX interfaces;
wenzelm
parents: 26641
diff changeset
   589
fun hide_class fully c = map_tsig (fn ((space, classes), default, types) =>
33095
bbd52d2f8696 renamed NameSpace to Name_Space -- also to emphasize its subtle change in semantics;
wenzelm
parents: 33094
diff changeset
   590
  ((Name_Space.hide fully c space, classes), default, types));
16370
033d890fe91f name space of classes and types maintained in tsig;
wenzelm
parents: 16340
diff changeset
   591
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   592
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   593
(* arities *)
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   594
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   595
fun add_arity pp (t, Ss, S) tsig = tsig |> map_tsig (fn ((space, classes), default, types) =>
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   596
  let
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   597
    val _ =
27302
8d12ac6a3e1c type constructors now with markup
haftmann
parents: 27273
diff changeset
   598
      (case lookup_type tsig t of
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   599
        SOME (LogicalType n) => if length Ss <> n then error (bad_nargs t) else ()
33094
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   600
      | SOME _ => error ("Logical type constructor expected: " ^ quote t)
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   601
      | NONE => error (undecl_type t));
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   602
    val (Ss', S') = (map (cert_sort tsig) Ss, cert_sort tsig S)
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   603
      handle TYPE (msg, _, _) => error msg;
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   604
    val classes' = classes |> Sorts.add_arities pp ((t, map (fn c' => (c', Ss')) S'));
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   605
  in ((space, classes'), default, types) end);
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   606
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   607
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   608
(* classrel *)
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   609
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   610
fun add_classrel pp rel tsig =
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   611
  tsig |> map_tsig (fn ((space, classes), default, types) =>
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   612
    let
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   613
      val rel' = pairself (cert_class tsig) rel
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   614
        handle TYPE (msg, _, _) => error msg;
32784
1a5dde5079ac eliminated redundant bindings;
wenzelm
parents: 32738
diff changeset
   615
      val classes' = classes |> Sorts.add_classrel pp rel';
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   616
    in ((space, classes'), default, types) end);
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   617
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   618
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   619
(* default sort *)
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   620
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   621
fun set_defsort S tsig = tsig |> map_tsig (fn (classes, _, types) =>
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   622
  (classes, cert_sort tsig S handle TYPE (msg, _, _) => error msg, types));
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   623
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   624
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   625
(* types *)
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   626
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   627
local
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   628
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   629
fun new_decl naming (c, decl) types =
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   630
  #2 (Name_Space.define true naming (c, decl) types);
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   631
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   632
fun map_types f = map_tsig (fn (classes, default, types) =>
19579
b802d1804b77 replaced Sorts.DOMAIN by general Sorts.CLASS_ERROR;
wenzelm
parents: 19530
diff changeset
   633
  let
b802d1804b77 replaced Sorts.DOMAIN by general Sorts.CLASS_ERROR;
wenzelm
parents: 19530
diff changeset
   634
    val (space', tab') = f types;
33095
bbd52d2f8696 renamed NameSpace to Name_Space -- also to emphasize its subtle change in semantics;
wenzelm
parents: 33094
diff changeset
   635
    val _ = Name_Space.intern space' "dummy" = "dummy" orelse
21858
05f57309170c avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents: 21116
diff changeset
   636
      error "Illegal declaration of dummy type";
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   637
  in (classes, default, (space', tab')) end);
2964
557a11310988 moved classes / sorts to sorts.ML;
wenzelm
parents: 2753
diff changeset
   638
14989
5a5d076a9863 tuned certify_typ;
wenzelm
parents: 14906
diff changeset
   639
fun syntactic types (Type (c, Ts)) =
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   640
      (case Symtab.lookup types c of SOME Nonterminal => true | _ => false)
14989
5a5d076a9863 tuned certify_typ;
wenzelm
parents: 14906
diff changeset
   641
        orelse exists (syntactic types) Ts
5a5d076a9863 tuned certify_typ;
wenzelm
parents: 14906
diff changeset
   642
  | syntactic _ _ = false;
5a5d076a9863 tuned certify_typ;
wenzelm
parents: 14906
diff changeset
   643
27302
8d12ac6a3e1c type constructors now with markup
haftmann
parents: 27273
diff changeset
   644
in
8d12ac6a3e1c type constructors now with markup
haftmann
parents: 27273
diff changeset
   645
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   646
fun add_type naming (c, n) =
33094
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   647
  if n < 0 then error ("Bad type constructor declaration " ^ quote (Binding.str_of c))
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   648
  else map_types (new_decl naming (c, LogicalType n));
27302
8d12ac6a3e1c type constructors now with markup
haftmann
parents: 27273
diff changeset
   649
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   650
fun add_abbrev naming (a, vs, rhs) tsig = tsig |> map_types (fn types =>
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   651
  let
30343
79f022df8527 replace old bstring by binding for logical primitives: class, type, const etc.;
wenzelm
parents: 29275
diff changeset
   652
    fun err msg =
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   653
      cat_error msg ("The error(s) above occurred in type abbreviation " ^
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   654
        quote (Binding.str_of a));
24274
cb9236269af1 type mode: models certification mode (default, syntax, abbrev);
wenzelm
parents: 23655
diff changeset
   655
    val rhs' = strip_sorts (no_tvars (cert_typ_mode mode_syntax tsig rhs))
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   656
      handle TYPE (msg, _, _) => err msg;
33094
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   657
    val _ =
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   658
      (case duplicates (op =) vs of
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   659
        [] => []
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   660
      | dups => err ("Duplicate variables on lhs: " ^ commas_quote dups));
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   661
    val _ =
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   662
      (case subtract (op =) vs (map #1 (Term.add_tfreesT rhs' [])) of
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   663
        [] => []
ef0d77b1e687 eliminated separate stamp -- NameSpace.define/merge etc. ensure uniqueness already;
wenzelm
parents: 32784
diff changeset
   664
      | extras => err ("Extra variables on rhs: " ^ commas_quote extras));
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   665
  in types |> new_decl naming (a, Abbreviation (vs, rhs', syntactic (#2 types) rhs')) end);
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   666
33173
b8ca12f6681a eliminated obsolete tags for types/consts -- now handled via name space, in strongly typed fashion;
wenzelm
parents: 33097
diff changeset
   667
fun add_nonterminal naming = map_types o new_decl naming o rpair Nonterminal;
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   668
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   669
end;
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   670
26669
c27efd6de25d simplified hide_XXX interfaces;
wenzelm
parents: 26641
diff changeset
   671
fun hide_type fully c = map_tsig (fn (classes, default, (space, types)) =>
33095
bbd52d2f8696 renamed NameSpace to Name_Space -- also to emphasize its subtle change in semantics;
wenzelm
parents: 33094
diff changeset
   672
  (classes, default, (Name_Space.hide fully c space, types)));
16370
033d890fe91f name space of classes and types maintained in tsig;
wenzelm
parents: 16340
diff changeset
   673
3790
95a47d8bcd69 eliminated raise_term, raise_typ;
wenzelm
parents: 3411
diff changeset
   674
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   675
(* merge type signatures *)
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   676
36450
62eaaffe6e47 more systematic naming of tsig operations;
wenzelm
parents: 36447
diff changeset
   677
fun merge_tsig pp (tsig1, tsig2) =
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   678
  let
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   679
    val (TSig {classes = (space1, classes1), default = default1, types = types1,
26641
cf67665296c2 tsig: removed unnecessary universal witness;
wenzelm
parents: 26517
diff changeset
   680
      log_types = _}) = tsig1;
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   681
    val (TSig {classes = (space2, classes2), default = default2, types = types2,
26641
cf67665296c2 tsig: removed unnecessary universal witness;
wenzelm
parents: 26517
diff changeset
   682
      log_types = _}) = tsig2;
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   683
33095
bbd52d2f8696 renamed NameSpace to Name_Space -- also to emphasize its subtle change in semantics;
wenzelm
parents: 33094
diff changeset
   684
    val space' = Name_Space.merge (space1, space2);
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   685
    val classes' = Sorts.merge_algebra pp (classes1, classes2);
19515
9f650083da65 build classes/arities: refer to operations in sorts.ML;
wenzelm
parents: 19464
diff changeset
   686
    val default' = Sorts.inter_sort classes' (default1, default2);
33095
bbd52d2f8696 renamed NameSpace to Name_Space -- also to emphasize its subtle change in semantics;
wenzelm
parents: 33094
diff changeset
   687
    val types' = Name_Space.merge_tables (types1, types2);
19642
ea7162f84677 more abstract interface to classes/arities;
wenzelm
parents: 19579
diff changeset
   688
  in build_tsig ((space', classes'), default', types') end;
14790
0d984ee030a1 major cleanup of tsig datastructures and extend/merge operations; fixes old bugs in classes/arities code; proper treatment of nonterminals and syntax-only types;
wenzelm
parents: 13666
diff changeset
   689
0
a5a9c433f639 Initial revision
clasohm
parents:
diff changeset
   690
end;