[java] module stub, module name index, module-info.class files reading

java/java-tests/testData/psi/cls/mirror/module-info.txt

@@ -0,0 +1,5 @@
+
+  // IntelliJ API Decompiler stub source generated from a class file
+  // Implementation of methods is not available
+
+module M.N { /* compiled code */ }

java/java-tests/testData/psi/cls/stubBuilder/module-info.txt

@@ -0,0 +1,2 @@
+PsiJavaFileStub []
+  PsiJavaModuleStub:M.N

java/java-tests/testSrc/com/intellij/psi/ClsMirrorBuildingTest.java

@@ -175,6 +175,11 @@ public class ClsMirrorBuildingTest extends LightIdeaTestCase {
     assertFalse(isInner("weird/ToStringStyle"));
   }
 
+  public void testModuleInfo() {
+    String testDir = getTestDataDir();
+    doTest(testDir + "../stubBuilder/module-info.class", testDir + "module-info.txt");
+  }
+
   private static String getTestDataDir() {
     return JavaTestUtil.getJavaTestDataPath() + "/psi/cls/mirror/";
   }

java/java-tests/testSrc/com/intellij/psi/ClsPsiTest.java

@@ -412,6 +412,18 @@ public class ClsPsiTest extends LightIdeaTestCase {
     assertEquals("@pkg.TypeAnnotations.TA(\"parameter\") int", p1.getType().getCanonicalText(true));
   }
 
+  public void testModuleInfo() {
+    PsiJavaFile file = getFile("../../stubBuilder/module-info");
+    assertEquals(LanguageLevel.JDK_1_9, file.getLanguageLevel());
+
+    PsiJavaModule module = file.getModuleDeclaration();
+    assertNotNull(module);
+    assertEquals("M.N", module.getModuleName());
+
+    assertNull(file.getPackageStatement());
+    assertEquals(0, file.getClasses().length);
+  }
+
   private PsiJavaFile getFile() {
     return getFile(getTestName(false));
   }

java/java-tests/testSrc/com/intellij/psi/ClsStubBuilderTest.java

@@ -51,6 +51,13 @@ public class ClsStubBuilderTest extends LightIdeaTestCase {
     doTest(clsFile, getTestName(false) + ".txt");
   }
 
+  public void testModuleInfo() {
+    String clsFilePath = JavaTestUtil.getJavaTestDataPath() + "/psi/cls/stubBuilder/module-info.class";
+    VirtualFile clsFile = LocalFileSystem.getInstance().findFileByPath(clsFilePath);
+    assertNotNull(clsFile);
+    doTest(clsFile, "module-info.txt");
+  }
+
   private void doTest(String className) {
     VirtualFile clsFile = findFile(className);
     assertNotNull(clsFile);
@@ -79,7 +86,7 @@ public class ClsStubBuilderTest extends LightIdeaTestCase {
     try {
       PsiFileStub stub = ClsFileImpl.buildFileStub(clsFile, clsFile.contentsToByteArray());
       assertNotNull(stub);
-      String actual = ((StubBase)stub).printTree();
+      String actual = ((StubBase)stub).printTree().trim();
 
       File resultFile = new File(JavaTestUtil.getJavaTestDataPath() + "/psi/cls/stubBuilder/" + resultFileName);
       if (!resultFile.exists()) {
@@ -88,7 +95,7 @@ public class ClsStubBuilderTest extends LightIdeaTestCase {
         fail("No test data found. Created one");
       }
 
-      String expected = StringUtil.convertLineSeparators(FileUtil.loadFile(resultFile));
+      String expected = StringUtil.convertLineSeparators(FileUtil.loadFile(resultFile)).trim();
 
       assertEquals(expected, actual);
     }

java/java-tests/testSrc/com/intellij/psi/JavaStubBuilderTest.java

@@ -486,6 +486,15 @@ public class JavaStubBuilderTest extends LightIdeaTestCase {
            "        IMPLEMENTS_LIST:PsiRefListStub[IMPLEMENTS_LIST:]\n");
   }
 
+  public void testModuleInfo() {
+    doTest("module M. /*ignore me*/ N {\n" +
+           "  requires A.B;\n" +
+           "}",
+
+           "PsiJavaFileStub []\n" +
+           "  MODULE:PsiJavaModuleStub:M.N\n");
+  }
+
   public void testSOEProof() {
     StringBuilder sb = new StringBuilder();
     SecureRandom random = new SecureRandom();