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Gracefully ignore no-op redefs
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James Eversole 2025-01-27 16:19:59 -06:00
parent 203bc1898d
commit 3b833ca75b
1 changed files with 16 additions and 16 deletions
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28
src/Eval.hs
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@ -10,26 +10,26 @@ import qualified Data.Set as Set
evalSingle :: Env -> TricuAST -> Env
evalSingle env term
| SDef name [] body <- term =
if
| Map.member name env ->
errorWithoutStackTrace $
"Error: Identifier '" ++ name ++ "' is already defined."
| otherwise ->
| SDef name [] body <- term
= case Map.lookup name env of
Just existingValue
| existingValue == evalAST env body -> env
| otherwise -> errorWithoutStackTrace $
"Unable to rebind immutable identifier: '" ++ name
Nothing ->
let res = evalAST env body
in Map.insert "!result" res (Map.insert name res env)
| SApp func arg <- term =
let res = apply (evalAST env func) (evalAST env arg)
| SApp func arg <- term
= let res = apply (evalAST env func) (evalAST env arg)
in Map.insert "!result" res env
| SVar name <- term =
case Map.lookup name env of
Just v ->
Map.insert "!result" v env
| SVar name <- term
= case Map.lookup name env of
Just v -> Map.insert "!result" v env
Nothing ->
errorWithoutStackTrace $ "Variable `" ++ name ++ "` not defined\n\
\This error should never occur here. Please report this as an issue."
| otherwise =
Map.insert "!result" (evalAST env term) env
| otherwise
= Map.insert "!result" (evalAST env term) env
evalTricu :: Env -> [TricuAST] -> Env
evalTricu env x = go env (reorderDefs env x)