lambdapi 2.3.1 · OCaml Package

Signature state.

This module provides a record type sig_state containing all the informations needed for scoping p_terms and printing terms, and functions on this type for manipulating it. In particular, it provides functions open_sign, add_symbol, add_binop, etc. taking a sig_state as argument and returning a new sig_state as result. These functions call the corresponding functions of Sign which should not be called directly but through the current module only, in order to setup the sig_state properly.

val create_sign : Common.Path.t -> Sign.t

create_sign path creates a signature with path path with ghost modules as dependencies.

type sig_state = {

signature : Sign.t;
(*
Current signature.
*)
in_scope : Term.sym Lplib.Extra.StrMap.t;
(*
Symbols in scope.
*)
alias_path : Common.Path.t Lplib.Extra.StrMap.t;
(*
Alias to path map.
*)
path_alias : string Common.Path.Map.t;
(*
Path to alias map.
*)
builtins : Term.sym Lplib.Extra.StrMap.t;
(*
Builtins.
*)
notations : float Sign.notation Core.Term.SymMap.t;
(*
Notations.
*)
open_paths : Common.Path.Set.t;
(*
Open modules.
*)

}

State of the signature, including aliasing and accessible symbols.

type t = sig_state

val dummy : sig_state

Dummy sig_state.

val add_symbol : 
  sig_state ->
  Term.expo ->
  Term.prop ->
  Term.match_strat ->
  bool ->
  Common.Pos.strloc ->
  Term.term ->
  bool list ->
  Term.term option ->
  sig_state * Term.sym

add_symbol ss expo prop mstrat opaq id typ impl def generates a new signature state from ss by creating a new symbol with expo e, property p, strategy st, name x, type a, implicit arguments impl and optional definition def. This new symbol is returned too.

val add_notation : sig_state -> Term.sym -> float Sign.notation -> sig_state

add_notation ss s n maps s notation to n in ss.

val add_builtin : sig_state -> string -> Term.sym -> sig_state

add_builtin ss n s generates a new signature state from ss by mapping the builtin n to s.

val open_sign : sig_state -> Sign.t -> sig_state

open_sign ss sign extends the signature state ss with every symbol of the signature sign. This has the effect of putting these symbols in the scope when (possibly masking symbols with the same name). Builtins and notations are also handled in a similar way.

val of_sign : Sign.t -> sig_state

of_sign sign creates a state from the signature sign and open it as well as the ghost signatures.

val find_sym : 
  prt:bool ->
  prv:bool ->
  sig_state ->
  Term.qident Common.Pos.loc ->
  Term.sym

find_sym ~prt ~prv b st qid returns the symbol corresponding to the qualified identifier qid. If fst qid.elt is empty, we search for the name snd qid.elt in the opened modules of st. The boolean b only indicates if the error message should mention variables, in the case where the module path is empty and the symbol is unbound. This is reported using the Fatal exception. Term.expo.Protec symbols from other modules are allowed in left-hand side of rewrite rules (only) iff ~prt is true. Term.expo.Privat symbols are allowed iff ~prv is true.

package lambdapi