feat(csharp): add test case for macro preprocessor

Add a new test case to `CSharpAstListenerTest` to test the macro preprocessor functionality. The test code includes a sample C# code with preprocessor directives. The test verifies that the analysis correctly identifies the data structures in the code.

Author: phodal

chapi-ast-csharp/src/main/kotlin/chapi/ast/csharpast/CSharpAnalyser.kt

@@ -56,9 +56,24 @@ open class CSharpAnalyser : Analyser {
                     preprocessorParser.inputStream = directiveTokenStream
                     preprocessorParser.reset()
                     // Parse condition in preprocessor directive (based on CSharpPreprocessorParser.g4 grammar).
-                    val directive: CSharpPreprocessorParser.Preprocessor_directiveContext = preprocessorParser.preprocessor_directive()
+                    val directive = preprocessorParser.preprocessor_directive()
+
                     // if true than next code is valid and not ignored.
                     compiledTokens = directive.value
+                    val directiveStr = tokens[index + 1].text.trim { it <= ' ' }
+                    if ("line" == directiveStr || "error" == directiveStr || "warning" == directiveStr || "define" == directiveStr || "endregion" == directiveStr || "endif" == directiveStr || "pragma" == directiveStr) {
+                        compiledTokens = true
+                    }
+                    var conditionalSymbol: String?
+                    if ("define" == tokens[index + 1].text) {
+                        // add to the conditional symbols
+                        conditionalSymbol = tokens[index + 2].text
+                        preprocessorParser.ConditionalSymbols.add(conditionalSymbol)
+                    }
+                    if ("undef" == tokens[index + 1].text) {
+                        conditionalSymbol = tokens[index + 2].text
+                        preprocessorParser.ConditionalSymbols.remove(conditionalSymbol)
+                    }
                     index = directiveTokenIndex - 1
                 }
                 token.channel == CSharpLexer.COMMENTS_CHANNEL -> {

chapi-ast-csharp/src/test/kotlin/chapi/ast/csharpast/CSharpAstListenerTest.kt

@@ -3,7 +3,7 @@ package chapi.ast.csharpast
 import org.junit.jupiter.api.Test
 import kotlin.test.assertEquals
 
-internal class CSharpAstListenerTest  {
+internal class CSharpAstListenerTest {
     private val helloworld = """
     using System; 
       
@@ -336,5 +336,26 @@ namespace Chapi {
         val structs = codeContainer.Containers[0].DataStructures
         assertEquals(structs.size, 1)
     }
+
+    @Test
+    fun macroPreprocessor() {
+        val code = """
+            using System.Text;  
+            namespace testns {
+            public class testcls {
+                            public static void Main(string []args) {
+                    #if DEBUG
+                            int x = 2;
+                    #else
+                            int y  = 10;
+                    #endif
+                            }
+                    }
+            }"""
+        val codeContainer = CSharpAnalyser().analysis(code, "test.cs")
+        val structs = codeContainer.Containers[0].DataStructures
+        println(structs)
+        assertEquals(structs.size, 1)
+    }
 }