-(* Goalfile evaluation
+(* Goalfile Abstract Syntax Tree
* Copyright (C) 2019 Richard W.M. Jones
* Copyright (C) 2019 Red Hat Inc.
*
open Utils
-let rec evaluate_targets env exprs =
- List.iter (evaluate_target env) exprs
-
-and evaluate_target env = function
- | Ast.EGoal _ -> assert false
-
- (* This could be an instruction to call a goal, or it
- * could be a tactic.
- *)
- | Ast.ECall (loc, "file", [filename]) (* XXX define tactics! *) ->
- (* All parameters of tactics must be simple expressions (strings,
- * in future booleans, numbers, etc).
- *)
- let args = [filename] in
- let args = List.map (simplify env) args in
- run_goal_for_tactic loc env "file" args
-
- | Ast.ECall (loc, "file", _) ->
- failwithf "%a: file tactic called with wrong number of parameters"
- Ast.string_loc loc
-
- | Ast.ECall (loc, name, args) ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: goal ‘%s’ not found" Ast.string_loc loc name in
- let goal =
- match expr with
- | Ast.EGoal (loc, goal) -> goal
- | _ ->
- failwithf "%a: tried to call ‘%s’ which is not a goal"
- Ast.string_loc loc name in
- run_goal loc env name args goal
-
- (* Look up the variable and substitute it. *)
- | Ast.EVar (loc, name) ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: variable ‘%s’ not found" Ast.string_loc loc name in
- evaluate_target env expr
-
- (* Lists are inlined when found as a target. *)
- | Ast.EList (loc, exprs) ->
- evaluate_targets env exprs
-
- (* A string (with or without substitutions) implies file (filename). *)
- | Ast.ESubsts (loc, str) ->
- let str = substitute loc env str in
- run_goal_for_tactic loc env "file" [Ast.CString str]
-
- | Ast.EConstant (loc, c) ->
- run_goal_for_tactic loc env "file" [c]
-
-(* Find the goal which matches the given tactic and run it.
- * Params is a list of constants.
- *)
-and run_goal_for_tactic loc env tactic const_args =
- (* Search across all goals for a matching tactic. *)
- let goals =
- let env = Ast.StringMap.bindings env in
- filter_map
- (function (name, Ast.EGoal (loc, goal)) -> Some (name, goal) | _ -> None)
- env in
- let name, goal =
- (* If there are multiple goals matching, this must choose
- * the most recently defined (XXX).
- *)
- try
- List.find
- (fun (_, (_, patterns, _, _)) ->
- List.exists (matching_pattern loc env tactic const_args) patterns)
- goals
- with
- Not_found ->
- failwithf "%a: don't know how to build %s %s"
- Ast.string_loc loc
- tactic
- (String.concat ", "
- (List.map (function Ast.CString s -> s) const_args)) in
-
- let args = [] (* XXX calculate free variables *) in
- run_goal loc env name args goal
-
-(* XXX This only does exact matches at the moment. *)
-and matching_pattern loc env tactic const_args = function
- | Ast.PTactic (loc, constructor, params)
- when tactic = constructor &&
- List.length const_args = List.length params ->
- (* Try to simplify the parameters of this pattern down
- * to constants, but don't fail here if we can't do this.
- *)
- (try
- let params = List.map (substitute loc env) params in
- let params = List.map (fun s -> Ast.CString s) params in
- const_args = params
- with Failure _ -> false
- )
-
- | Ast.PTactic _ -> false
-
- | Ast.PVar (loc, name) -> assert false
-(*
- NOT IMPLEMENTED - we need variables to contain constructors!
- (try
- let expr = Ast.StringMap.find name env in
- let expr = simplify env expr in
- with Not_found -> false
- )
-*)
-
-(* Run a named goal. *)
-and run_goal loc env name args (params, patterns, deps, code) =
- (* Substitute the args for the parameters in the environment. *)
- let params =
- try List.combine params args
- with Invalid_argument _ ->
- failwithf "%a: calling goal ‘%s’ with wrong number of arguments"
- Ast.string_loc loc name in
- let env =
- List.fold_left (fun env (k, v) -> Ast.StringMap.add k v env)
- env params in
-
- (* Evaluate the dependencies first. *)
- evaluate_targets env deps;
-
- (* Check if any target needs to be updated. *)
- (* XXX *)
-
- (* Run the code (if any). *)
- (match code with
- | None -> ()
- | Some code ->
- let code = substitute loc env code in
- Printf.printf "running : %s\n" code
- );
-
- (* Check all targets were updated (else it's an error). *)
- (* XXX *)
-
-(* Take any expression and simplify it down to a constant.
- * If the expression cannot be simplified then this throws
- * an error.
- *)
-and simplify env = function
+let rec to_constant env = function
| Ast.EConstant (loc, c) -> c
- | Ast.EVar (loc, name) ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: variable ‘%s’ not found" Ast.string_loc loc name in
- simplify env expr
+ | EVar (loc, name) ->
+ let expr = Ast.getvar env loc name in
+ to_constant env expr
- | Ast.ESubsts (loc, str) ->
- Ast.CString (substitute loc env str)
+ | ESubsts (loc, str) ->
+ CString (substitute env loc str)
- | Ast.EList (loc, _) ->
+ | EList (loc, _) ->
failwithf "%a: list found where constant expression expected"
Ast.string_loc loc
- | Ast.ECall (loc, name, _) ->
- failwithf "%a: cannot use goal or tactic ‘%s’ in constant expression"
+ | ECallGoal (loc, name, _) ->
+ failwithf "%a: cannot use goal ‘%s’ in constant expression"
Ast.string_loc loc name
- | Ast.EGoal (loc, _) ->
+ | ETacticConstructor (loc, name, _) ->
+ failwithf "%a: cannot use tactic ‘%s’ in constant expression"
+ Ast.string_loc loc name
+
+ | EGoalDefn (loc, _) ->
failwithf "%a: cannot use goal in constant expression"
Ast.string_loc loc
-(* Take a substitution list and try to turn it into a simple
- * string by evaluating every variable. If not possible this
- * throws an error. Returns a string.
- *)
-and substitute loc env substs =
+ | ETacticDefn (loc, _) ->
+ failwithf "%a: cannot use tactic in constant expression"
+ Ast.string_loc loc
+
+and substitute env loc substs =
let b = Buffer.create 13 in
List.iter (
function
| Ast.SString s -> Buffer.add_string b s
- | Ast.SVar name ->
- let expr =
- try Ast.StringMap.find name env
- with Not_found ->
- failwithf "%a: variable ‘%s’ not found" Ast.string_loc loc name in
- match simplify env expr with
+ | SVar name ->
+ let expr = Ast.getvar env loc name in
+ match to_constant env expr with
| Ast.CString s -> Buffer.add_string b s
) substs;
Buffer.contents b
+
+let rec to_shell_script env loc substs =
+ let b = Buffer.create 13 in
+ List.iter (
+ function
+ | Ast.SString s -> Buffer.add_string b s
+ | SVar name ->
+ let expr = Ast.getvar env loc name in
+ let s = expr_to_shell_string env expr in
+ Buffer.add_string b s
+ ) substs;
+ Buffer.contents b
+
+and expr_to_shell_string env = function
+ | Ast.EConstant (loc, CString s) -> Filename.quote s
+
+ | EVar (loc, name) ->
+ let expr = Ast.getvar env loc name in
+ expr_to_shell_string env expr
+
+ | ESubsts (loc, str) ->
+ Filename.quote (substitute env loc str)
+
+ | EList (loc, exprs) ->
+ let strs = List.map (expr_to_shell_string env) exprs in
+ (* These are shell quoted so we can just concat them with space. *)
+ String.concat " " strs
+
+ | ECallGoal (loc, name, _) ->
+ failwithf "%a: cannot use goal ‘%s’ in shell expansion"
+ Ast.string_loc loc name
+
+ (* Tactics expand to the first parameter. *)
+ | ETacticConstructor (loc, _, []) -> Filename.quote ""
+ | ETacticConstructor (loc, _, (arg :: _)) -> expr_to_shell_string env arg
+
+ | EGoalDefn (loc, _) ->
+ failwithf "%a: cannot use goal in shell expansion"
+ Ast.string_loc loc
+
+ | ETacticDefn (loc, _) ->
+ failwithf "%a: cannot use tactic in shell expansion"
+ Ast.string_loc loc
+
+let rec evaluate_goal_arg env = function
+ | Ast.EVar (loc, name) ->
+ let expr = Ast.getvar env loc name in
+ evaluate_goal_arg env expr
+
+ | ESubsts (loc, str) ->
+ let str = Ast.substitute env loc str in
+ Ast.EConstant (loc, Ast.CString str)
+
+ | EList (loc, exprs) ->
+ Ast.EList (loc, List.map (evaluate_goal_arg env) exprs)
+
+ | ETacticConstructor (loc, name, exprs) ->
+ Ast.ETacticConstructor (loc, name, List.map (evaluate_goal_arg env) exprs)
+
+ | ECallGoal (loc, name, _) ->
+ (* Goals don't return anything so they cannot be used in
+ * goal args. Use a function instead.
+ *)
+ failwithf "%a: cannot use goal ‘%s’ in goal argument"
+ Ast.string_loc loc name
+
+ | EConstant _
+ | EGoalDefn _
+ | ETacticDefn _ as e -> e
git.annexia.org / goals.git / blobdiff