More WIP
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Nix/Eval.hs
15
Nix/Eval.hs
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@ -21,6 +21,8 @@ import Nix.Atoms
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import Nix.Expr
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import Prelude hiding (mapM, sequence)
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import Nix.Parser
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import Data.Maybe (isJust)
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import Debug.Trace
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-- | An 'NValue' is the most reduced form of an 'NExpr' after evaluation
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@ -69,6 +71,12 @@ atomText (NBool b) = if b then "true" else "false"
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atomText NNull = "null"
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atomText (NUri uri) = uri
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expr = let Success x = parseNixString "({ x ? 1, y ? x * 3 }: y - x) {}"
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in x
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goeval :: MonadFix m => m (NValue m)
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goeval = evalExpr expr mempty
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buildArgument :: MonadFix m => Params (ValueSet m -> m (NValue m)) -> NValue m -> m (ValueSet m)
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buildArgument paramSpec arg = case paramSpec of
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Param name -> return $ Map.singleton name arg
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@ -77,17 +85,16 @@ buildArgument paramSpec arg = case paramSpec of
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Map.insert name arg <$> lookupParamSet s
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ParamSet _ _ -> error "Can't yet handle variadic param sets"
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where
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go env envAndArgs k def = maybe (error err) id $ mvalueFromEnv <|> mvalueFromDef
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go env evaledArgs k def = maybe (error err) id $ (mvalueFromEnv <|> mvalueFromDef)
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where
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mvalueFromEnv = return <$> Map.lookup k env
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mvalueFromDef = ($ Map.delete k envAndArgs) <$> def
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mvalueFromDef = ($ evaledArgs) <$> def
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err = "Could not find " ++ show k
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lookupParamSet s =
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case arg of
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Fix (NVSet env) -> do
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rec
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evaledArgs <- Map.traverseWithKey (\k v -> traceShow k $ go env envAndArgs k v) s
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let envAndArgs = env `Map.union` evaledArgs
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evaledArgs <- Map.traverseWithKey (go env evaledArgs) s
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return evaledArgs
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_ -> error "Unexpected function environment"
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@ -31,7 +31,7 @@ case_function_set_two_arg :: Assertion
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case_function_set_two_arg = constantEqualStr "2" "({ a, b ? 3 }: b - a) { a = 1; }"
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case_function_set_two_arg_default_scope :: Assertion
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case_function_set_two_arg_default_scope = constantEqualStr "2" "({ a ? 1, b ? a * 3 }: b - a) {}"
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case_function_set_two_arg_default_scope = constantEqualStr "2" "({ x ? 1, y ? x * 3 }: y - x) {}"
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case_function_default_env :: Assertion
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case_function_default_env = constantEqualStr "2" "let default = 2; in ({ a ? default }: a) {}"
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