phino-0.0.0.69: test/FunctionsSpec.hs

{-# LANGUAGE OverloadedStrings #-}

-- SPDX-FileCopyrightText: Copyright (c) 2025 Objectionary.com
-- SPDX-License-Identifier: MIT

module FunctionsSpec where

import AST
import Control.Exception (try)
import Control.Monad (void)
import Data.Map.Strict qualified as Map
import Data.Text qualified as T
import Deps (Term (TeBindings))
import Functions (buildTerm)
import Logger (logDebug)
import Matcher (MetaValue (MvBindings), Subst (Subst))
import Misc (uniqueBindings')
import Printer (printExpression)
import Test.Hspec (Spec, describe, it, shouldBe, shouldSatisfy)
import Text.Printf (printf)
import Yaml (ExtraArgument (ArgBinding, ArgExpression))

emit :: Expression
emit = ExDispatch (ExDispatch ExGlobal (AtLabel "hone")) (AtLabel "emit")

phiBinding :: T.Text -> Expression -> Binding
phiBinding name body = BiTau (AtLabel name) (ExFormation [BiTau AtPhi body])

bodyOf :: Binding -> Maybe Expression
bodyOf (BiTau _ (ExFormation [BiTau AtPhi expr])) = Just expr
bodyOf _ = Nothing

spec :: Test.Hspec.Spec
spec = describe "Functions" $ do
  Test.Hspec.it "contains only unique bindings after 'join'" $ do
    let first = ("B1", MvBindings [BiVoid AtRho, BiDelta BtEmpty, BiTau (AtLabel "x") ExGlobal, BiVoid (AtAlpha 0)])
        second = ("B2", MvBindings [BiTau AtRho ExThis, BiLambda "Func", BiDelta (BtOne "00"), BiVoid (AtAlpha 1)])
        third = ("B3", MvBindings [BiLambda "Some", BiTau (AtLabel "y") ExThis, BiTau (AtLabel "x") ExThis, BiVoid (AtAlpha 0)])
        subst = Subst (Map.fromList [first, second, third])
    TeBindings bds <- buildTerm "join" [ArgBinding (BiMeta "B1"), ArgBinding (BiMeta "B2"), ArgBinding (BiMeta "B3")] subst
    bds' <- uniqueBindings' bds
    logDebug (printf "Joined bindings:\n%s" (printExpression (ExFormation bds')))
    length bds' `shouldBe` 9
  Test.Hspec.it "splices replacement in the correct order before every sentinel match" $ do
    let foo = ExDispatch ExGlobal (AtLabel "foo")
        bar = ExDispatch ExGlobal (AtLabel "bar")
        cpsBody =
          [ phiBinding "x" foo
          , phiBinding "emit1" emit
          , phiBinding "y" bar
          , phiBinding "emit2" emit
          ]
        autoBody =
          [ phiBinding "add1" foo
          , phiBinding "add2" bar
          ]
        subst =
          Subst
            ( Map.fromList
                [ ("B-in", MvBindings cpsBody)
                , ("B-rep", MvBindings autoBody)
                ]
            )
    TeBindings result <-
      buildTerm
        "splice"
        [ ArgBinding (BiMeta "B-in")
        , ArgExpression emit
        , ArgBinding (BiMeta "B-rep")
        ]
        subst
    bds <- uniqueBindings' result
    logDebug (printf "Spliced bindings:\n%s" (printExpression (ExFormation bds)))
    map bodyOf bds
      `shouldBe` [ Just foo
                 , Just foo
                 , Just bar
                 , Just emit
                 , Just bar
                 , Just foo
                 , Just bar
                 , Just emit
                 ]
  Test.Hspec.it "returns the input unchanged when no sentinel match is found" $ do
    let foo = ExDispatch ExGlobal (AtLabel "foo")
        body = [phiBinding "x" foo, phiBinding "y" foo]
        subst =
          Subst
            ( Map.fromList
                [ ("B-in", MvBindings body)
                , ("B-rep", MvBindings [phiBinding "z" foo])
                ]
            )
    TeBindings result <-
      buildTerm
        "splice"
        [ ArgBinding (BiMeta "B-in")
        , ArgExpression emit
        , ArgBinding (BiMeta "B-rep")
        ]
        subst
    result `shouldBe` body
  Test.Hspec.it "produces only unique attributes for many splice positions" $ do
    let foo = ExDispatch ExGlobal (AtLabel "foo")
        body = [phiBinding (T.pack ('e' : show i)) emit | i <- [1 .. 5 :: Int]]
        rep = [phiBinding "a" foo, phiBinding "b" foo]
        subst =
          Subst
            ( Map.fromList
                [ ("B-in", MvBindings body)
                , ("B-rep", MvBindings rep)
                ]
            )
    TeBindings result <-
      buildTerm
        "splice"
        [ ArgBinding (BiMeta "B-in")
        , ArgExpression emit
        , ArgBinding (BiMeta "B-rep")
        ]
        subst
    bds <- uniqueBindings' result
    bds `shouldSatisfy` ((== length body + 5 * length rep) . length)
  Test.Hspec.it "fails fast when replacement contains a non-label binding" $ do
    let body = [phiBinding "e1" emit, phiBinding "e2" emit]
        rep = [phiBinding "a" emit, BiVoid AtRho]
        subst =
          Subst
            ( Map.fromList
                [ ("B-in", MvBindings body)
                , ("B-rep", MvBindings rep)
                ]
            )
    outcome <-
      try
        ( void
            ( buildTerm
                "splice"
                [ ArgBinding (BiMeta "B-in")
                , ArgExpression emit
                , ArgBinding (BiMeta "B-rep")
                ]
                subst
            )
        ) ::
        IO (Either IOError ())
    outcome `shouldSatisfy` isLeft
  where
    isLeft :: Either a b -> Bool
    isLeft (Left _) = True
    isLeft _ = False