X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=src%2Feval.ml;h=1688b5ffe548e30e478b0080ae9bd4d4e66ff13c;hb=091e4a356a31c64e0f1e943e20badb5613f1b21f;hp=1df1a174d14ff4c6530c6c27af89c26b3cd5b698;hpb=4d0527cd7ced1d96720e3af56da29a19551944f7;p=goals.git

diff --git a/src/eval.ml b/src/eval.ml
index 1df1a17..1688b5f 100644
--- a/src/eval.ml
+++ b/src/eval.ml
@@ -17,5 +17,318 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *)
 
-let evaluate file vars exprs =
-  ()
+open Printf
+
+open Utils
+
+let rec evaluate_targets env exprs =
+  List.iter (evaluate_target env) exprs
+
+and evaluate_target env = function
+  | Ast.EGoal _ | Ast.ETactic _ -> assert false
+
+  (* Call a goal. *)
+  | Ast.ECallGoal (loc, name, args) ->
+     let goal = Ast.getgoal env loc name in
+     run_goal env loc name args goal
+
+  (* Call a tactic. *)
+  | Ast.ECallTactic (loc, name, args) ->
+     (* All parameters of tactics must be simple constant expressions
+      * (strings, in future booleans, numbers, etc).
+      *)
+     let args = List.map (Ast.to_constant env) args in
+     run_tactic env loc name args
+
+  (* If this is a goal then it's the same as calling goal().  If not
+   * then look up the variable and substitute it.
+   *)
+  | Ast.EVar (loc, name) ->
+     let expr = Ast.getvar env loc name in
+     (match expr with
+      | EGoal (loc, ([], _, _, _)) ->
+         evaluate_target env (Ast.ECallGoal (loc, name, []))
+      | EGoal _ ->
+         failwithf "%a: cannot call %s() since this goal has parameters"
+           Ast.string_loc loc name
+      | _ ->
+         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 = Ast.substitute env loc str in
+     run_tactic env loc "*file" [Ast.CString str]
+
+  | Ast.EConstant (loc, c) ->
+     run_tactic env loc "*file" [c]
+
+(* Run a goal by name. *)
+and run_goal env loc name args (params, patterns, deps, code) =
+  Cmdline.debug "%a: running goal %s %a"
+    Ast.string_loc loc name Ast.string_expr (Ast.EList (Ast.noloc, args));
+
+  (* Create a new environment which maps the parameter names to
+   * the args.
+   *)
+  let env =
+    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
+    List.fold_left (fun env (k, v) -> Ast.Env.add k v env) env params in
+
+  (* Check all dependencies have been updated. *)
+  evaluate_targets env deps;
+
+  (* Check if any target (ie. pattern) needs to be rebuilt. *)
+  let rebuild = List.exists (needs_rebuild env loc deps) patterns in
+
+  if rebuild then (
+    (* Run the code (if any). *)
+    (match code with
+     | None -> ()
+     | Some code ->
+        (* Add some standard variables to the environment. *)
+        let expr_of_substs s = Ast.ESubsts (Ast.noloc, s) in
+        let expr_of_pattern = function
+          | Ast.PTactic (loc, tactic, targs) ->
+             Ast.ECallTactic (loc, tactic, List.map expr_of_substs targs)
+        in
+        let pexprs = List.map expr_of_pattern patterns in
+        let env = Ast.Env.add "@" (Ast.EList (Ast.noloc, pexprs)) env in
+        let env = Ast.Env.add "<" (Ast.EList (Ast.noloc, deps)) env in
+        let env =
+          match deps with
+          | [] -> env
+          | d :: _ -> Ast.Env.add "^" d env in
+        let code = Ast.to_shell_script env loc code in
+        let code = "set -e\nset -x\n\n" ^ code in
+        let r = Sys.command code in
+        if r <> 0 then (
+          eprintf "*** goal ‘%s’ failed with exit code %d\n" name r;
+          exit 1
+        )
+    );
+
+    (* Check all targets were updated (else it's an error). *)
+    let pattern_still_needs_rebuild =
+      try Some (List.find (needs_rebuild env loc deps) patterns)
+      with Not_found -> None in
+    match pattern_still_needs_rebuild with
+    | None -> ()
+    | Some pattern ->
+       failwithf "%a: goal ‘%s’ ran successfully but it did not rebuild %a"
+         Ast.string_loc loc
+         name
+         Ast.string_pattern pattern
+  )
+
+(* Return whether the target (pattern) needs to be rebuilt. *)
+and needs_rebuild env loc deps pattern =
+  Cmdline.debug "%a: testing if %a needs rebuild"
+    Ast.string_loc loc Ast.string_pattern pattern;
+
+  match pattern with
+  | Ast.PTactic (loc, tactic, targs) ->
+     (* Look up the tactic. *)
+     let params, code = Ast.gettactic env loc tactic in
+
+     (* Resolve the targs down to constants.  Since needs_rebuild
+      * should be called with env containing the goal params, this
+      * should substitute any parameters in the tactic arguments.
+      *)
+     let targs = List.map (Ast.substitute env loc) targs in
+     let targs =
+       List.map (fun targ ->
+           Ast.EConstant (Ast.noloc, Ast.CString targ)) targs in
+
+     (* Create a new environment binding parameter names
+      * to tactic args.
+      *)
+     let env =
+       let params =
+         try List.combine params targs
+         with Invalid_argument _ ->
+           failwithf "%a: calling tactic ‘%s’ with wrong number of arguments"
+             Ast.string_loc loc tactic in
+       List.fold_left (fun env (k, v) -> Ast.Env.add k v env) env params in
+
+     (* Add some standard variables to the environment. *)
+     let env = Ast.Env.add "<" (Ast.EList (Ast.noloc, deps)) env in
+     let env =
+       match deps with
+       | [] -> env
+       | d :: _ -> Ast.Env.add "^" d env in
+     let code = Ast.to_shell_script env loc code in
+     let code = "set -e\nset -x\n\n" ^ code in
+     let r = Sys.command code in
+     if r = 99 (* means "needs rebuild" *) then true
+     else if r = 0 (* means "doesn't need rebuild" *) then false
+     else (
+       eprintf "*** tactic ‘%s’ failed with exit code %d\n" tactic r;
+       exit 1
+     )
+
+(* Find the goal which matches the given tactic and run it.
+ * cargs is a list of parameters (all constants).
+ *)
+and run_tactic env loc tactic cargs =
+  Cmdline.debug "%a: running tactic %s" Ast.string_loc loc tactic;
+
+  (* Find all goals in the environment.  Returns a list of (name, goal). *)
+  let goals =
+    let env = Ast.Env.bindings env in
+    filter_map
+      (function
+       | name, Ast.EGoal (loc, goal) -> Some (name, goal)
+       | _ -> None) env in
+
+  (* Find all patterns.  Returns a list of (pattern, name, goal). *)
+  let patterns : (Ast.pattern * Ast.id * Ast.goal) list =
+    List.flatten
+      (List.map (fun (name, ((_, patterns, _, _) as goal)) ->
+           List.map (fun pattern -> (pattern, name, goal)) patterns) goals) in
+
+  (* Find any patterns (ie. tactics) which match the one we
+   * are searching for.  This returns a binding for the goal args,
+   * so we end up with a list of (pattern, name, goal, args).
+   *)
+  let patterns : (Ast.pattern * Ast.id * Ast.goal * Ast.expr list) list =
+    filter_map (
+      fun (pattern, name, ((params, _, _, _) as goal)) ->
+        match matching_pattern env loc tactic cargs pattern params with
+        | None -> None
+        | Some args -> Some (pattern, name, goal, args)
+    ) patterns in
+
+  match patterns with
+  | [_, name, goal, args] ->
+     run_goal env loc name args goal
+
+  | [] ->
+     (* There's no matching goal, but we don't need one if
+      * the tactic doesn't need to be rebuilt.
+      *)
+     let targs = List.map (function Ast.CString s -> [Ast.SString s]) cargs in
+     let p = Ast.PTactic (loc, tactic, targs) in
+     if needs_rebuild env loc [] p then (
+       let t = Ast.ECallTactic (loc, tactic,
+                                List.map (fun c -> Ast.EConstant (loc, c))
+                                  cargs) in
+       failwithf "%a: don't know how to build %a"
+         Ast.string_loc loc Ast.string_expr t
+     )
+
+  | _ ->
+     (* If there are multiple matching goals, then assuming the goals
+      * are different we must pick the one which was defined last in
+      * the file.  However we don't do that right now. XXX
+      *)
+     assert false (* TODO! *)
+
+(* Test if pattern matches *tactic(cargs).  If it does
+ * then we return Some args where args is the arguments that must
+ * be passed to the matching goal.  The params parameter is
+ * the names of the parameters of that goal.
+ *)
+and matching_pattern env loc tactic cargs pattern params =
+  match pattern with
+  | Ast.PTactic (loc, ttactic, targs)
+       when tactic <> ttactic ||
+            List.length cargs <> List.length targs ->
+     None (* Can't possibly match if tactic name or #args is different. *)
+  | Ast.PTactic (loc, ttactic, targs) ->
+     (* Do the args match with a possible params binding? *)
+     try Some (matching_params env loc params targs cargs)
+     with Not_found -> None
+
+(* Return a possible binding.  For example the goal is:
+ *   goal compile (name) = "%name.o": "%name.c" {}
+ * which means that params = ["name"] and targs = ["%name.o"].
+ *
+ * If we are called with cargs = ["file1.o"], we would
+ * return ["file1"].
+ *
+ * On non-matching this raises Not_found.
+ *)
+and matching_params env loc params targs cargs =
+  (* This is going to record the resulting binding. *)
+  let res = ref Ast.Env.empty in
+  List.iter2 (matching_param env loc params res) targs cargs;
+
+  (* Rearrange the result into goal parameter order.  Also this
+   * checks that every parameter got a binding.
+   *)
+  let res = !res in
+  List.map (
+    (* Allow the Not_found exception to escape if no binding for this param. *)
+    fun param -> Ast.Env.find param res
+  ) params
+
+(* If targ = "%name.o" and carg = "file.o" then this would set
+ * name => "file" in !res.  If they don't match, raises Not_found.
+ *)
+and matching_param env loc params res targ carg =
+  match carg with
+  | Ast.CString carg ->
+     (* Substitute any non parameters in targ from the environment. *)
+     let targ =
+       List.map (
+         function
+         | Ast.SString _ as s -> s
+         | Ast.SVar name ->
+            if not (List.mem name params) then (
+              try
+                let expr = Ast.getvar env loc name in
+                match Ast.to_constant env expr with
+                | Ast.CString s -> Ast.SString s
+              with Failure _ -> raise Not_found
+            )
+            else
+              Ast.SVar name
+       ) targ in
+
+     (* Do the actual pattern matching.  Any remaining SVar elements
+      * must refer to goal parameters.
+      *)
+     let carg = ref carg in
+     let rec loop = function
+       | [] ->
+          (* End of targ, we must have matched all of carg. *)
+          if !carg <> "" then raise Not_found
+       | Ast.SString s :: rest ->
+          (* Does this match the first part of !carg? *)
+          let clen = String.length !carg in
+          let slen = String.length s in
+          if slen > clen || s <> String.sub !carg 0 slen then
+            raise Not_found;
+          (* Yes, so continue after the matching prefix. *)
+          carg := String.sub !carg slen (clen-slen);
+          loop rest
+       | Ast.SVar name :: Ast.SString s :: rest ->
+          (* This is a goal parameter.  Find s later in !carg. *)
+          let i = string_find !carg s in
+          if i = -1 then raise Not_found;
+          (* Set the binding in !res. *)
+          let r = Ast.EConstant (Ast.noloc,
+                                 Ast.CString (String.sub !carg 0 i)) in
+          res := Ast.Env.add name r !res;
+          (* Continue after the match. *)
+          let skip = i + String.length s in
+          carg := String.sub !carg skip (String.length !carg - skip);
+          loop rest
+       | Ast.SVar name :: [] ->
+          (* Matches the whole remainder of the string. *)
+          let r = Ast.EConstant (Ast.noloc, Ast.CString !carg) in
+          res := Ast.Env.add name r !res
+       | Ast.SVar x :: Ast.SVar y :: _ ->
+          (* TODO! We cannot match a target like "%x%y". *)
+          assert false
+     in
+     loop targ