v1.5.5-SNAPSHOT started. compile if support

lynglib/src/commonTest/kotlin/CompileIfTest.kt

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2026 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.
+ *
+ */
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.eval
+import net.sergeych.lyng.obj.toInt
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class CompileIfTest {
+
+    @Test
+    fun falseBranchSkipsMissingSymbols() = runTest {
+        val result = eval(
+            """
+            var x = 0
+            compile if (defined(NoSuchClass)) {
+                x = NoSuchClass("foo")
+            } else {
+                x = 42
+            }
+            x
+            """.trimIndent()
+        )
+        assertEquals(42, result.toInt())
+    }
+
+    @Test
+    fun logicExpressionsWorkForDefinedChecks() = runTest {
+        val result = eval(
+            """
+            var x = 0
+            compile if (defined(String) && !defined(NoSuchClass)) {
+                x = 7
+            } else {
+                x = NoSuchClass("foo")
+            }
+            x
+            """.trimIndent()
+        )
+        assertEquals(7, result.toInt())
+    }
+
+    @Test
+    fun packageChecksWorkInCompileIf() = runTest {
+        val result = eval(
+            """
+            var x = 0
+            compile if (defined(lyng.stdlib) && !defined(no.such.pkg)) {
+                x = 1
+            } else {
+                x = 2
+            }
+            x
+            """.trimIndent()
+        )
+        assertEquals(1, result.toInt())
+    }
+
+    @Test
+    fun singleStatementBranchesWork() = runTest {
+        val result = eval(
+            """
+            var x = 0
+            compile if (defined(String))
+                x = 9
+            else
+                x = NoSuchClass("foo")
+            x
+            """.trimIndent()
+        )
+        assertEquals(9, result.toInt())
+    }
+
+    @Test
+    fun nestedElseBranchIsSkippedAsSingleStatement() = runTest {
+        val result = eval(
+            """
+            var x = 0
+            compile if (defined(NoSuchClass))
+                if (true)
+                    x = NoSuchClass("foo")
+                else
+                    x = 1
+            else
+                x = 5
+            x
+            """.trimIndent()
+        )
+        assertEquals(5, result.toInt())
+    }
+}

lynglib/src/commonTest/kotlin/CompileTimeResolutionSpecTest.kt

@@ -20,9 +20,7 @@ import net.sergeych.lyng.Compiler
 import net.sergeych.lyng.Script
 import net.sergeych.lyng.Source
 import net.sergeych.lyng.resolution.SymbolOrigin
-import kotlin.test.Ignore
 import kotlin.test.Test
-import kotlin.test.assertEquals
 import kotlin.test.assertTrue
 
 class CompileTimeResolutionSpecTest {
@@ -83,6 +81,20 @@ class CompileTimeResolutionSpecTest {
         assertTrue(report.errors.any { it.message.contains("missingName") })
     }
 
+    @Test
+    fun compileIfSkipsResolutionForUnselectedBranch() = runTest {
+        val report = dryRun(
+            """
+            compile if (defined(NoSuchClass)) {
+                NoSuchClass("foo")
+            } else {
+                1
+            }
+            """
+        )
+        assertTrue(report.errors.isEmpty())
+    }
+
     @Test
     fun miAmbiguityIsCompileError() = runTest {
         val report = dryRun(