From b590f9cbd4cfca3daa33786186837e77b0824387 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sun, 8 Dec 2024 20:02:12 +0100
Subject: Separate parsers for individual variables and function calls

---
 src/Parser/Expr.hs | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/src/Parser/Expr.hs b/src/Parser/Expr.hs
index 024ea6b..5ff3f15 100644
--- a/src/Parser/Expr.hs
+++ b/src/Parser/Expr.hs
@@ -233,7 +233,7 @@ someExpr = join inner <?> "expression"
     term = label "term" $ choice
         [ parens inner
         , return <$> literal
-        , return <$> variable
+        , return <$> functionCall
         ]
 
     table = [ [ prefix "-" $ [ SomeUnOp (negate @Integer)
@@ -356,25 +356,29 @@ variable = label "variable" $ do
     off <- stateOffset <$> getParserState
     sline <- getSourceLine
     name <- varName
-    lookupVarExpr off sline name >>= \case
+    e <- lookupVarExpr off sline name
+    recordSelector e <|> return e
+
+functionCall :: TestParser SomeExpr
+functionCall = do
+    sline <- getSourceLine
+    variable >>= \case
         SomeExpr e'@(FunVariable argTypes _ _) -> do
             let check = checkFunctionArguments argTypes
             args <- functionArguments check someExpr literal (\poff -> lookupVarExpr poff sline . VarName)
             return $ SomeExpr $ ArgsApp args e'
-        e -> do
-            recordSelector e <|> return e
+        e -> return e
 
+recordSelector :: SomeExpr -> TestParser SomeExpr
+recordSelector (SomeExpr expr) = do
+    void $ osymbol "."
+    off <- stateOffset <$> getParserState
+    m <- identifier
+    let err = parseError $ FancyError off $ S.singleton $ ErrorFail $ T.unpack $ T.concat
+            [ T.pack "value of type ", textExprType expr, T.pack " does not have member '", m, T.pack "'" ]
+    e' <- maybe err return $ applyRecordSelector m expr <$> lookup m recordMembers
+    recordSelector e' <|> return e'
   where
-    recordSelector :: SomeExpr -> TestParser SomeExpr
-    recordSelector (SomeExpr e) = do
-        void $ osymbol "."
-        off <- stateOffset <$> getParserState
-        m <- identifier
-        let err = parseError $ FancyError off $ S.singleton $ ErrorFail $ T.unpack $ T.concat
-                [ T.pack "value of type ", textExprType e, T.pack " does not have member '", m, T.pack "'" ]
-        e' <- maybe err return $ applyRecordSelector m e <$> lookup m recordMembers
-        recordSelector e' <|> return e'
-
     applyRecordSelector :: ExprType a => Text -> Expr a -> RecordSelector a -> SomeExpr
     applyRecordSelector m e (RecordSelector f) = SomeExpr $ App (AnnRecord m) (pure f) e
 
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