(*i $Id$ i*)

(*i*)
open Util
open Stamps
open Names
open Term
open Sign
open Evd
open Environ
open Proof_type
(*i*)

(* This module declares readable constraints, and a few utilities on
   constraints and proof trees *)

val mk_goal : ctxtty -> named_context -> constr -> goal

val mt_ctxt    : local_constraints -> ctxtty
val get_ctxt   : goal -> ctxtty
val get_pgm    : goal -> constr option
val set_pgm    : constr option -> ctxtty -> ctxtty
val get_lc     : goal -> local_constraints
val set_lc     : local_constraints -> ctxtty -> ctxtty

val rule_of_proof     : proof_tree -> rule
val ref_of_proof      : proof_tree -> (rule * proof_tree list)
val children_of_proof : proof_tree -> proof_tree list
val goal_of_proof     : proof_tree -> goal
val subproof_of_proof : proof_tree -> proof_tree
val status_of_proof   : proof_tree -> pf_status
val is_complete_proof : proof_tree -> bool
val is_leaf_proof     : proof_tree -> bool
val is_tactic_proof   : proof_tree -> bool


(*s A global constraint is a mappings of existential variables with
    some extra information for the program and mimick tactics. *)

type global_constraints = enamed_declarations timestamped

(*s A readable constraint is a global constraint plus a focus set
    of existential variables and a signature. *)

type evar_recordty = {
  focus : local_constraints;
  hyps  : named_context;
  decls : enamed_declarations }

and readable_constraints = evar_recordty timestamped

val rc_of_gc  : global_constraints -> goal -> readable_constraints
val rc_add    : readable_constraints -> int * goal -> readable_constraints
val get_hyps  : readable_constraints -> named_context
val get_env   : readable_constraints -> env
val get_focus : readable_constraints -> local_constraints
val get_decls : readable_constraints -> enamed_declarations
val get_gc    : readable_constraints -> global_constraints
val remap     : readable_constraints -> int * goal -> readable_constraints
val ctxt_access : readable_constraints -> int -> bool

val pf_lookup_name_as_renamed : 
  named_context -> constr -> identifier -> int option
val pf_lookup_index_as_renamed : constr -> int -> int option


(*s Pretty printing functions. *)

(*i*)
open Pp
(*i*)

val pr_goal      : goal -> std_ppcmds
val pr_subgoals  : goal list -> std_ppcmds
val pr_subgoal   : int -> goal list -> std_ppcmds

val pr_decl      : goal -> std_ppcmds
val pr_decls     : global_constraints -> std_ppcmds
val pr_evc       : readable_constraints -> std_ppcmds

val prgl         : goal -> std_ppcmds
val pr_seq       : goal -> std_ppcmds
val pr_focus     : local_constraints -> std_ppcmds
val pr_ctxt      : ctxtty -> std_ppcmds
val pr_evars     : (int * goal) list -> std_ppcmds
val pr_evars_int : int -> (int * goal) list -> std_ppcmds
val pr_subgoals_existential : enamed_declarations -> goal list -> std_ppcmds

(* Gives the ast corresponding to a tactic argument *)
val ast_of_cvt_arg : tactic_arg ->  Coqast.t