tdpeuter/2025LogProg-project-GhentProlog
tdpeuter/2025LogProg-project-GhentProlog
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RetractAll

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This commit is contained in:
Tibo De Peuter 2025-05-05 22:06:26 +02:00
parent 4d334c1600
commit 1179e6a29b
Signed by: tdpeuter
GPG key ID: 38297DE43F75FFE2
4 changed files with 94 additions and 16 deletions
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68
tests/prolog/builtins/DatabaseOperatorsTests.kt
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@ -15,6 +15,7 @@ import prolog.ast.logic.Fact
import prolog.ast.logic.Predicate
import prolog.ast.logic.Rule
import prolog.ast.terms.Atom
import prolog.ast.terms.Functor
import prolog.ast.terms.Structure
import prolog.ast.terms.Variable
@ -131,7 +132,7 @@ class DatabaseOperatorsTests {
@Test
fun `simple retract`() {
val predicate = Predicate(listOf(Fact(Atom("a"))))
val predicate = Predicate(listOf(Fact(Atom("a"))), dynamic = true)
Program.db.load(predicate)
assertEquals(1, Program.query(Atom("a")).count())
@ -146,11 +147,13 @@ class DatabaseOperatorsTests {
@Test
fun `retract atom`() {
val predicate = Predicate(listOf(
Fact(Atom("a")),
Fact(Atom("a")),
Fact(Atom("a"))
))
val predicate = Predicate(
listOf(
Fact(Atom("a")),
Fact(Atom("a")),
Fact(Atom("a"))
), dynamic = true
)
Program.db.load(predicate)
val control = Program.query(Atom("a")).toList()
@ -181,11 +184,13 @@ class DatabaseOperatorsTests {
@Test
fun `retract compound with variable`() {
val predicate = Predicate(listOf(
Fact(Structure(Atom("a"), listOf(Atom("b")))),
Fact(Structure(Atom("a"), listOf(Atom("c")))),
Fact(Structure(Atom("a"), listOf(Atom("d"))))
))
val predicate = Predicate(
listOf(
Fact(Structure(Atom("a"), listOf(Atom("b")))),
Fact(Structure(Atom("a"), listOf(Atom("c")))),
Fact(Structure(Atom("a"), listOf(Atom("d"))))
), dynamic = true
)
Program.db.load(predicate)
val control = Program.query(Structure(Atom("a"), listOf(Variable("X")))).toList()
@ -289,4 +294,45 @@ class DatabaseOperatorsTests {
assertEquals(Atom("bob"), result2[Variable("X")], "Expected bob")
assertEquals(Atom("sushi"), result2[Variable("Y")], "Expected sushi")
}
@Test
fun `retract all`() {
val predicate = Predicate(
listOf(
Fact(Structure(Atom("a"), listOf(Atom("b")))),
Fact(Structure(Atom("a"), listOf(Atom("c")))),
Fact(Structure(Atom("a"), listOf(Atom("d"))))
), dynamic = true
)
Program.db.load(predicate)
val control = Program.query(Structure(Atom("a"), listOf(Variable("X")))).toList()
assertEquals(3, control.size, "Expected 3 results")
assertEquals(3, Program.db.predicates["a/1"]!!.clauses.size, "Expected 3 clauses")
val retract = RetractAll(Structure(Atom("a"), listOf(Variable("X"))))
val result = retract.satisfy(emptyMap()).toList()
assertEquals(1, result.size, "Expected 1 result")
assertTrue(result[0].isSuccess, "Expected success")
assertEquals(0, Program.db.predicates["a/1"]!!.clauses.size, "Expected 0 clauses")
}
@Test
fun `If Head refers to a predicate that is not defined, it is implicitly created as a dynamic predicate`() {
val predicateName = "idonotyetexist"
val predicateFunctor = "$predicateName/1"
assertFalse(predicateFunctor in Program.db.predicates, "Expected predicate to not exist before")
val retractAll = RetractAll(Structure(Atom(predicateName), listOf(Variable("X"))))
val result = retractAll.satisfy(emptyMap()).toList()
assertEquals(1, result.size, "Expected 1 result")
assertTrue(result[0].isSuccess, "Expected success")
assertTrue(predicateFunctor in Program.db.predicates, "Expected predicate to exist after")
assertTrue(Program.db.predicates[predicateFunctor]!!.dynamic, "Expected predicate to be dynamic")
}
}