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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(** This module implements pattern-matching on terms *)
open Names
open Term
open Environ
open Pattern
open Termops
(** [PatternMatchingFailure] is the exception raised when pattern
matching fails *)
exception PatternMatchingFailure
(** [special_meta] is the default name of the meta holding the
surrounding context in subterm matching *)
val special_meta : metavariable
(** [bound_ident_map] represents the result of matching binding
identifiers of the pattern with the binding identifiers of the term
matched *)
type bound_ident_map = Id.t Id.Map.t
(** [matches pat c] matches [c] against [pat] and returns the resulting
assignment of metavariables; it raises [PatternMatchingFailure] if
not matchable; bindings are given in increasing order based on the
numbers given in the pattern *)
val matches : constr_pattern -> constr -> patvar_map
(** [matches_head pat c] does the same as [matches pat c] but accepts
[pat] to match an applicative prefix of [c] *)
val matches_head : constr_pattern -> constr -> patvar_map
(** [extended_matches pat c] also returns the names of bound variables
in [c] that matches the bound variables in [pat]; if several bound
variables or metavariables have the same name, the metavariable,
or else the rightmost bound variable, takes precedence *)
val extended_matches :
constr_pattern -> constr -> bound_ident_map * extended_patvar_map
(** [is_matching pat c] just tells if [c] matches against [pat] *)
val is_matching : constr_pattern -> constr -> bool
(** [is_matching_head pat c] just tells if [c] or an applicative
prefix of it matches against [pat] *)
val is_matching_head : constr_pattern -> constr -> bool
(** [matches_conv env sigma] matches up to conversion in environment
[(env,sigma)] when constants in pattern are concerned; it raises
[PatternMatchingFailure] if not matchable; bindings are given in
increasing order based on the numbers given in the pattern *)
val matches_conv :env -> Evd.evar_map -> constr_pattern -> constr -> patvar_map
(** The type of subterm matching results: a substitution + a context
(whose hole is denoted here with [special_meta]) + a continuation that
either returns the next matching subterm or raise PatternMatchingFailure *)
type matching_result =
{ m_sub : bound_ident_map * patvar_map;
m_ctx : constr }
(** [match_subterm n pat c] returns the substitution and the context
corresponding to the first **closed** subterm of [c] matching [pat], and
a continuation that looks for the next matching subterm. *)
val match_subterm : constr_pattern -> constr -> matching_result IStream.t
(** [match_appsubterm pat c] returns the substitution and the context
corresponding to the first **closed** subterm of [c] matching [pat],
considering application contexts as well. *)
val match_appsubterm : constr_pattern -> constr -> matching_result IStream.t
(** [match_subterm_gen] calls either [match_subterm] or [match_appsubterm] *)
val match_subterm_gen : bool (** true = with app context *) ->
constr_pattern -> constr -> matching_result IStream.t
(** [is_matching_appsubterm pat c] tells if a subterm of [c] matches
against [pat] taking partial subterms into consideration *)
val is_matching_appsubterm : ?closed:bool -> constr_pattern -> constr -> bool
(** [is_matching_conv env sigma pat c] tells if [c] matches against [pat]
up to conversion for constants in patterns *)
val is_matching_conv :
env -> Evd.evar_map -> constr_pattern -> constr -> bool
|
