v1.0.1-SNAPSHOT: named args in calls

lynglib/src/commonTest/kotlin/NamedArgsTest.kt

@@ -0,0 +1,154 @@
+/*
+ * Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/*
+ * Named arguments and named splats test suite
+ */
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.ExecutionError
+import net.sergeych.lyng.eval
+import kotlin.test.Test
+import kotlin.test.assertFailsWith
+
+class NamedArgsTest {
+
+    @Test
+    fun basicNamedArgsAndDefaults() = runTest {
+        eval(
+            """
+            fun test(a="foo", b="bar", c="bazz") { [a, b, c] }
+            assertEquals( ["foo", "b", "bazz"], test(b: "b") )
+            assertEquals( ["a", "bar", "c"], test("a", c: "c") )
+            """.trimIndent()
+        )
+    }
+
+    @Test
+    fun positionalAfterNamedIsError() = runTest {
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun f(a, b) { [a,b] }
+                f(a: 1, 2)
+                """.trimIndent()
+            )
+        }
+    }
+
+    @Test
+    fun namedSplatsBasic() = runTest {
+        eval(
+            """
+            fun test(a="a", b="b", c="c", d="d") { [a, b, c, d] }
+            val r = test("A?", ...Map("d" => "D!", "b" => "B!"))
+            assertEquals(["A?","B!","c","D!"], r)
+            """.trimIndent()
+        )
+    }
+
+    @Test
+    fun namedSplatsNonStringKeysError() = runTest {
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun test(a,b) {}
+                test(1, ...Map(1 => "x"))
+                """.trimIndent()
+            )
+        }
+    }
+
+    @Test
+    fun trailingBlockConflictWhenLastNamed() = runTest {
+        // Error: last parameter already assigned by a named argument; trailing block must be rejected
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun f(x, onDone) { onDone(x) }
+                // Name the last parameter inside parentheses, then try to pass a trailing block
+                f(1, onDone: { it }) { 42 }
+                """.trimIndent()
+            )
+        }
+        // Normal case still works when last parameter is not assigned by name
+        eval(
+            """
+            fun f(x, onDone) { onDone(x) }
+            var res = 0
+            f(1) { it -> res = it }
+            assertEquals(1, res)
+            """.trimIndent()
+        )
+    }
+
+    @Test
+    fun duplicateNamedIsError() = runTest {
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun f(a,b,c) {}
+                f(a: 1, a: 2)
+                """.trimIndent()
+            )
+        }
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun f(a,b,c) {}
+                f(a: 1, ...Map("a" => 2))
+                """.trimIndent()
+            )
+        }
+    }
+
+    @Test
+    fun unknownParameterIsError() = runTest {
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun f(a,b) {}
+                f(z: 1)
+                """.trimIndent()
+            )
+        }
+    }
+
+    @Test
+    fun ellipsisCannotBeNamed() = runTest {
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun g(args..., tail) {}
+                g(args: [1], tail: 2)
+                """.trimIndent()
+            )
+        }
+    }
+
+    @Test
+    fun positionalSplatAfterNamedIsError() = runTest {
+        assertFailsWith<ExecutionError> {
+            eval(
+                """
+                fun f(a,b,c) {}
+                f(a: 1, ...[2,3])
+                """.trimIndent()
+            )
+        }
+    }
+}