add #![log] pragma

lib/Quox/Log.idr

@@ -2,6 +2,7 @@ module Quox.Log
 
 import Quox.Loc
 import Quox.Pretty
+import Quox.PrettyValExtra
 
 import Data.So
 import Data.DPair
@@ -90,7 +91,7 @@ record LogLevels where
   defLevel : LogLevel
   levels   : LevelMap
 %name LogLevels lvls
-%runElab derive "LogLevels" [Eq, Show]
+%runElab derive "LogLevels" [Eq, Show, PrettyVal]
 
 public export
 LevelStack : Type
@@ -142,6 +143,7 @@ data PushArg =
     SetDefault LogLevel
   | SetCat     LogCategory LogLevel
   | SetAll     LogLevel
+%runElab derive "PushArg" [Eq, Ord, Show, PrettyVal]
 %name PushArg push
 
 export %inline

lib/Quox/Parser/FromParser.idr

@@ -398,6 +398,10 @@ fromPDecl (PDef def) =
 fromPDecl (PNs  ns)  =
   maybeFail ns.fail ns.loc $
   localAt NS (<+> ns.name) $ concat <$> traverse fromPDecl ns.decls
+fromPDecl (PPrag prag) =
+  case prag of
+    PLogPush p _ => Log.push p $> []
+    PLogPop    _ => Log.pop    $> []
 
 mutual
   export covering

lib/Quox/Parser/Lexer.idr

@@ -247,7 +247,7 @@ public export
 reserved : List Reserved
 reserved =
   [Punc1 "(", Punc1 ")", Punc1 "[", Punc1 "]", Punc1 "{", Punc1 "}",
-   Punc1 ",", Punc1 ";", Punc1 "#[",
+   Punc1 ",", Punc1 ";", Punc1 "#[", Punc1 "#![",
    Sym1 "@",
    Sym1 ":",
    Sym "⇒" `Or` Sym "=>",

lib/Quox/Parser/Parser.idr

@@ -626,14 +626,19 @@ term fname = lamTerm fname
 
 
 export
-attr : FileName -> Grammar True PAttr
+attr' : FileName -> (o : String) -> (0 _ : IsReserved o) =>
-attr fname = withLoc fname $ do
+        Grammar True PAttr
-  resC "#["
+attr' fname o = withLoc fname $ do
+  resC o
   name <- baseName
   args <- many $ termArg fname
   mustWork $ resC "]"
   pure $ PA name args
 
+export %inline
+attr : FileName -> Grammar True PAttr
+attr fname = attr' fname "#["
+
 export
 findDups : List PAttr -> List String
 findDups attrs =
@@ -658,44 +663,48 @@ attrList fname = do
   noDups res $> res
 
 public export
-data AttrMatch a = Matched a | NoMatch String | Malformed String String
+data AttrMatch a =
+    Matched a
+  | NoMatch String (List String)
+  | Malformed String String
 
 export
 Functor AttrMatch where
   map f (Matched x)     = Matched $ f x
-  map f (NoMatch s)     = NoMatch s
+  map f (NoMatch s w)   = NoMatch s w
   map f (Malformed a e) = Malformed a e
 
 export
 (<|>) : AttrMatch a -> AttrMatch a -> AttrMatch a
 Matched x     <|> _ = Matched x
-NoMatch _     <|> y = y
+NoMatch {}    <|> y = y
 Malformed a e <|> _ = Malformed a e
 
 export
-isFail : PAttr -> AttrMatch PFail
+isFail : PAttr -> List String -> AttrMatch PFail
-isFail (PA "fail" []        _) = Matched PFailAny
+isFail (PA "fail" []        _) _ = Matched PFailAny
-isFail (PA "fail" [Str s _] _) = Matched $ PFailMatch s
+isFail (PA "fail" [Str s _] _) _ = Matched $ PFailMatch s
-isFail (PA "fail" _ _) = Malformed "fail" "be absent or a string literal"
+isFail (PA "fail" _ _) _ = Malformed "fail" "be absent or a string literal"
-isFail a = NoMatch a.name
+isFail a w = NoMatch a.name w
 
 export
-isMain : PAttr -> AttrMatch ()
+isMain : PAttr -> List String -> AttrMatch ()
-isMain (PA "main" [] _) = Matched ()
+isMain (PA "main" [] _) _ = Matched ()
-isMain (PA "main" _  _) = Malformed "main" "have no arguments"
+isMain (PA "main" _  _) _ = Malformed "main" "have no arguments"
-isMain a = NoMatch a.name
+isMain a w = NoMatch a.name w
 
 export
-isScheme : PAttr -> AttrMatch String
+isScheme : PAttr -> List String -> AttrMatch String
-isScheme (PA "compile-scheme" [Str s _] _) = Matched s
+isScheme (PA "compile-scheme" [Str s _] _) _ = Matched s
-isScheme (PA "compile-scheme" _ _) =
+isScheme (PA "compile-scheme" _ _) _ =
   Malformed "compile-scheme" "be a string literal"
-isScheme a = NoMatch a.name
+isScheme a w = NoMatch a.name w
 
 export
 matchAttr : String -> AttrMatch a -> Either String a
 matchAttr _ (Matched x) = Right x
-matchAttr d (NoMatch a) = Left "unrecognised \{d} attribute \{a}"
+matchAttr d (NoMatch a w) = Left $ unlines
+  ["unrecognised \{d} attribute \{a}", "expected one of: \{show w}"]
 matchAttr _ (Malformed a s) = Left $ unlines
   ["invalid \{a} attribute", "(should \{s})"]
 
@@ -710,10 +719,12 @@ where
   data PDefAttr = DefFail PFail | DefMain | DefScheme String
 
   isDefAttr : PAttr -> Either String PDefAttr
-  isDefAttr attr = matchAttr "definition" $
+  isDefAttr attr =
-        DefFail   <$> isFail attr
+    let defAttrs = ["fail", "main", "compile-scheme"] in
-    <|> DefMain   <$  isMain attr
+    matchAttr "definition" $
-    <|> DefScheme <$> isScheme attr
+        DefFail   <$> isFail attr defAttrs
+    <|> DefMain   <$  isMain attr defAttrs
+    <|> DefScheme <$> isScheme attr defAttrs
 
   addAttr : PDefinition -> PAttr -> Either String PDefinition
   addAttr def attr =
@@ -730,7 +741,7 @@ mkPNamespace attrs name decls = do
   res <- foldlM addAttr start attrs
   pure $ \l => {loc_ := l} (the PNamespace res)
 where
-  isNsAttr = matchAttr "namespace" . isFail
+  isNsAttr a = matchAttr "namespace" $ isFail a ["fail"]
 
   addAttr : PNamespace -> PAttr -> Either String PNamespace
   addAttr ns attr = pure $ {fail := !(isNsAttr attr)} ns
@@ -785,6 +796,48 @@ export
 nsname : Grammar True Mods
 nsname = do ns <- qname; pure $ ns.mods :< ns.base
 
+export
+pragma : FileName -> Grammar True PPragma
+pragma fname = do
+  a <- attr' fname "#!["
+  either fatalError pure $ case a.name of
+    "log" => logArgs a.args a.loc
+    _     => Left $
+      #"unrecognised pragma "\#{a.name}"\n"# ++
+      #"known pragmas: ["log"]"#
+where
+  levelOOB : Nat -> Either String a
+  levelOOB n = Left $
+    "log level \{show n} out of bounds\n" ++
+    "expected number in range 0–\{show maxLogLevel} inclusive"
+
+  toLevel : Nat -> Either String LogLevel
+  toLevel lvl = maybe (levelOOB lvl) Right $ toLogLevel lvl
+
+  unknownCat : String -> Either String a
+  unknownCat cat = Left $
+    "unknown log category \{show cat}\n" ++
+    "known categories: \{show $ ["all", "default"] ++ logCategories}"
+
+  toCat : String -> Either String LogCategory
+  toCat cat = maybe (unknownCat cat) Right $ toLogCategory cat
+
+  fromPair : PTerm -> Either String (String, Nat)
+  fromPair (Pair (V (MkPName [<] x) Nothing _) (Nat n _) _) = Right (x, n)
+  fromPair _ = Left "invalid argument to log pragma"
+
+  logCatArg : (String, Nat) -> Either String Log.PushArg
+  logCatArg ("default", lvl) = [|SetDefault $ toLevel lvl|]
+  logCatArg ("all",     lvl) = [|SetAll $ toLevel lvl|]
+  logCatArg (cat,       lvl) = [|SetCat (toCat cat) (toLevel lvl)|]
+
+  logArgs : List PTerm -> Loc -> Either String PPragma
+  logArgs [] _ = Left "missing arguments to log pragma"
+  logArgs [V "pop" Nothing _] loc = Right $ PLogPop loc
+  logArgs other loc = do
+    args <- traverse (logCatArg <=< fromPair) other
+    pure $ PLogPush args loc
+
 
 export
 decl : FileName -> Grammar True PDecl
@@ -806,7 +859,9 @@ declBody fname attrs =
   [|PDef $ definition fname attrs|] <|> [|PNs $ namespace_ fname attrs|]
 
 -- decl : FileName -> Grammar True PDecl
-decl fname = attrList fname >>= declBody fname
+decl fname =
+      (attrList fname >>= declBody fname)
+  <|> PPrag <$> pragma fname
 
 export
 load : FileName -> Grammar True PTopLevel

lib/Quox/Parser/Syntax.idr

@@ -4,6 +4,7 @@ import public Quox.Loc
 import public Quox.Syntax
 import public Quox.Definition
 import Quox.PrettyValExtra
+import public Quox.Log
 
 import Derive.Prelude
 %hide TT.Name
@@ -184,6 +185,18 @@ record PDefinition where
 
 export Located PDefinition where def.loc = def.loc_
 
+public export
+data PPragma =
+    PLogPush (List Log.PushArg) Loc
+  | PLogPop  Loc
+%name PPragma prag
+%runElab derive "PPragma" [Eq, Ord, Show, PrettyVal]
+
+export
+Located PPragma where
+  (PLogPush _ loc).loc = loc
+  (PLogPop    loc).loc = loc
+
 mutual
   public export
   record PNamespace where
@@ -198,6 +211,7 @@ mutual
   data PDecl =
       PDef  PDefinition
     | PNs   PNamespace
+    | PPrag PPragma
   %name PDecl decl
 %runElab deriveMutual ["PNamespace", "PDecl"] [Eq, Ord, Show, PrettyVal]
 
@@ -207,6 +221,7 @@ export
 Located PDecl where
   (PDef  d).loc    = d.loc
   (PNs   ns).loc   = ns.loc
+  (PPrag prag).loc = prag.loc
 
 public export
 data PTopLevel = PD PDecl | PLoad String Loc

lib/Quox/PrettyValExtra.idr

@@ -1,5 +1,6 @@
 module Quox.PrettyValExtra
 
+import Data.DPair
 import Derive.Prelude
 import public Text.Show.Value
 import public Text.Show.PrettyVal
@@ -8,3 +9,12 @@ import public Text.Show.PrettyVal.Derive
 %language ElabReflection
 
 %runElab derive "SnocList" [PrettyVal]
+
+
+export %inline
+PrettyVal a => PrettyVal (Subset a p) where
+  prettyVal (Element x _) = Con "Element" [prettyVal x, Con "_" []]
+
+export %inline
+(forall x. PrettyVal (p x)) => PrettyVal (Exists p) where
+  prettyVal (Evidence _ p) = Con "Evidence" [Con "_" [], prettyVal p]

tests/Tests/Parser.idr

@@ -531,7 +531,51 @@ tests = "parser" :- [
     parseMatch input #" load "a.quox"; def b = a.b "#
       `([PLoad "a.quox" _,
          PD (PDef $ MkPDef (PQ Any _) "b"
-          (PConcrete Nothing (V (MakePName [< "a"] "b") Nothing _))
+          (PConcrete Nothing (V (MkPName [< "a"] "b") Nothing _))
-          PSucceed False Nothing _)])
+          PSucceed False Nothing _)]),
+    parseMatch input #" #[main] postulate hi : String "#
+      `([PD (PDef $ MkPDef (PQ Any _) "hi"
+          (PPostulate (STRING _))
+          PSucceed True Nothing _)]),
+    parseMatch input #" #[compile-scheme "hi"] postulate hi : String "#
+      `([PD (PDef $ MkPDef (PQ Any _) "hi"
+          (PPostulate (STRING _))
+          PSucceed False (Just "hi") _)]),
+    parseMatch input #" #[main] #[compile-scheme "hi"] postulate hi : String "#
+      `([PD (PDef $ MkPDef (PQ Any _) "hi"
+          (PPostulate (STRING _))
+          PSucceed True (Just "hi") _)]),
+    parseMatch input #" #[fail] def hi = "hi!!!! uwu" "#
+      `([PD (PDef $ MkPDef (PQ Any _) "hi"
+          (PConcrete Nothing (Str "hi!!!! uwu" _))
+          PFailAny False Nothing _)]),
+    parseMatch input #" #[fail "type"] def hi = "hi!!!! uwu" "#
+      `([PD (PDef $ MkPDef (PQ Any _) "hi"
+          (PConcrete Nothing (Str "hi!!!! uwu" _))
+          (PFailMatch "type") False Nothing _)]),
+    parseMatch input #" #[fail] namespace ns { } "#
+      `([PD (PNs $ MkPNamespace [< "ns"] [] PFailAny _)]),
+    parseFails input #" #[fail 69] namespace ns { } "#,
+    parseFails input "#[main]",
+    parseFails input "#[main] namespace a { } ",
+    parseFails input #" #[not-an-attr] postulate hi : String "#,
+    parseFails input #" #[log pop] postulate hi : String "#,
+    parseMatch input #" #![log pop] "#
+      `([PD (PPrag (PLogPop _))]),
+    parseMatch input #" #![log (all, 5)] "#
+      `([PD (PPrag (PLogPush [SetAll (Element 5 _)] _))]),
+    parseMatch input #" #![log (default, 69)] "#
+      `([PD (PPrag (PLogPush [SetDefault (Element 69 _)] _))]),
+    parseMatch input #" #![log (whnf, 100)] "#
+      `([PD (PPrag (PLogPush [SetCat (Element "whnf" _) (Element 100 _)] _))]),
+    parseMatch input #" #![log (all, 5) (default, 69) (whnf, 100)] "#
+      `([PD (PPrag (PLogPush
+          [SetAll (Element 5 _), SetDefault (Element 69 _),
+           SetCat (Element "whnf" _) (Element 100 _)] _))]),
+    parseFails input #" #![log] "#,
+    parseFails input #" #![log (non-category, 5)] "#,
+    parseFails input #" #![log (whnf, 50000000)] "#,
+    parseFails input #" #![log [0.★⁵]] "#,
+    parseFails input #" #![main] "#
   ]
 ]