* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*)
-module StringMap : sig
+module Env : sig
type key = string
type 'a t
val empty: 'a t
val fold: (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
val filter: (key -> 'a -> bool) -> 'a t -> 'a t
val bindings: 'a t -> (key * 'a) list
+
+ (* This is not the normal Map.merge function. *)
+ val merge : 'a t -> 'a t -> 'a t
end
(** Location where we parsed from $loc = $startpos, $endpos *)
(** An environment is a set of variable and goal definitions, mapping
variable or goal name -> expression. *)
-type env = expr StringMap.t
+type env = expr Env.t
and pattern =
- (** match tactic such as file ("filename") *)
+ (** match tactic such as *file ("filename") *)
| PTactic of loc * id * substs list
- (** match named variable, which must be a string or list *)
- | PVar of loc * id
and expr =
- (** goal (params) = patterns : exprs = code *)
- | EGoal of loc * goal
- (** goalname (params), tactic (params) etc. *)
+ (** goal (params) = patterns : exprs code *)
+ | EGoalDefn of loc * goal
+ (** function (params) = code *)
+ | EFuncDefn of loc * func
+ (** tactic (params) = code *)
+ | ETacticDefn of loc * tactic
+ (** call goal (params) or function (params) *)
| ECall of loc * id * expr list
- (** variable *)
+ (** call *tactic (params) etc. *)
+ | ETacticCtor of loc * id * expr list
+ (** variable, or goal call with no parameters *)
| EVar of loc * id
(** list *)
| EList of loc * expr list
| EConstant of loc * constant
and constant =
| CString of string
-and goal = id list * pattern list * expr list * code option
+and goal = param_decl list * pattern list * expr list * code option
+and func = param_decl list * code
+and tactic = param_decl list * code
+ (** Goal/func/tactic parameter. *)
+and param_decl = id
and id = string
and code = substs
and substs = subst list
(** %-substitution. *)
| SVar of id
+(** Look up a variable in the environment. Raise [Failure _]
+ if not found. *)
+val getvar : env -> loc -> id -> expr
+
+(** Look up a goal in the environment. Raise [Failure _] if not
+ found or if the named variable is not a goal. *)
+val getgoal : env -> loc -> id -> goal
+
+(** Look up a function in the environment. Raise [Failure _] if not
+ found or if the named variable is not a function. *)
+val getfunc : env -> loc -> id -> func
+
+(** Look up a tactic in the environment. Raise [Failure _] if not
+ found or if the named variable is not a tactic. *)
+val gettactic : env -> loc -> id -> tactic
+
(** This is used for incrementally building Ast.substs in the parser. *)
module Substs : sig
type t
val add_var : t -> string -> unit
end
+(** %a formatters. *)
val print_env : out_channel -> env -> unit
+val string_pattern : unit -> pattern -> string
+val string_expr : unit -> expr -> string
+val print_expr : out_channel -> expr -> unit