Deal with absence of js library. fix K2JSMessagingTest

compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java

@@ -42,6 +42,7 @@ import org.jetbrains.k2js.facade.K2JSTranslator;
 import org.jetbrains.k2js.facade.MainCallParameters;
 
 import java.io.File;
+import java.util.Arrays;
 import java.util.List;
 
 import static org.jetbrains.jet.cli.common.messages.CompilerMessageLocation.NO_LOCATION;
@@ -151,6 +152,6 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments, K2JSCompile
             // lets discover the JS library definitions on the classpath
             return new ClassPathLibraryDefintionsConfig(project, moduleId, ecmaVersion);
         }
-        return new LibrarySourcesConfig(project, moduleId, arguments.libraryFiles, ecmaVersion);
+        return new LibrarySourcesConfig(project, moduleId, Arrays.asList(arguments.libraryFiles), ecmaVersion);
     }
 }

idea/src/org/jetbrains/jet/plugin/compiler/K2JSCompiler.java

@@ -39,6 +39,7 @@ import org.jetbrains.jet.plugin.project.JsModuleDetector;
 
 import java.io.PrintStream;
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Set;
 
 import static org.jetbrains.jet.plugin.compiler.CompilerUtils.invokeExecMethod;
@@ -166,7 +167,7 @@ public final class K2JSCompiler implements TranslatingCompiler {
     }
 
     private static void addLibLocationAndTarget(@NotNull Module module, @NotNull ArrayList<String> args) {
-        Pair<String[], String> libLocationAndTarget = JsModuleDetector.getLibLocationAndTargetForProject(module);
+        Pair<List<String>, String> libLocationAndTarget = JsModuleDetector.getLibLocationAndTargetForProject(module);
 
         StringBuilder sb = StringBuilderSpinAllocator.alloc();
         AccessToken token = ReadAction.start();

idea/src/org/jetbrains/jet/plugin/project/JsModuleDetector.java

@@ -16,6 +16,7 @@
 
 package org.jetbrains.jet.plugin.project;
 
+import com.google.common.collect.Lists;
 import com.intellij.openapi.module.Module;
 import com.intellij.openapi.module.ModuleManager;
 import com.intellij.openapi.project.Project;
@@ -27,6 +28,8 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.psi.JetFile;
 
+import java.util.List;
+
 /**
  * @author Pavel Talanov
  *         <p/>
@@ -53,7 +56,7 @@ public final class JsModuleDetector {
     }
 
     @NotNull
-    public static Pair<String[], String> getLibLocationAndTargetForProject(@NotNull Project project) {
+    public static Pair<List<String>, String> getLibLocationAndTargetForProject(@NotNull Project project) {
         Module module = getJSModule(project);
         if (module == null) {
             return Pair.empty();
@@ -64,11 +67,15 @@ public final class JsModuleDetector {
     }
 
     @NotNull
-    public static Pair<String[], String> getLibLocationAndTargetForProject(@NotNull Module module) {
+    public static Pair<List<String>, String> getLibLocationAndTargetForProject(@NotNull Module module) {
         K2JSModuleComponent jsModuleComponent = K2JSModuleComponent.getInstance(module);
         String pathToJavaScriptLibrary = jsModuleComponent.getPathToJavaScriptLibrary();
         String basePath = ModuleRootManager.getInstance(module).getContentRoots()[0].getPath();
-        return Pair.create(new String[] {basePath + pathToJavaScriptLibrary}, jsModuleComponent.getEcmaVersion().toString());
+        List<String> pathsToJSLib = Lists.newArrayList();
+        if (pathToJavaScriptLibrary != null) {
+            pathsToJSLib.add(basePath + pathToJavaScriptLibrary);
+        }
+        return Pair.create(pathsToJSLib, jsModuleComponent.getEcmaVersion().toString());
     }
 
     @Nullable

js/js.translator/src/org/jetbrains/k2js/config/LibrarySourcesConfig.java

@@ -21,7 +21,6 @@ import com.intellij.openapi.project.Project;
 import com.intellij.openapi.util.Key;
 import com.intellij.openapi.util.io.FileUtil;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.k2js.utils.JetFileUtils;
 
@@ -42,12 +41,12 @@ public class LibrarySourcesConfig extends Config {
     public static final Key<String> EXTERNAL_MODULE_NAME = new Key<String>("externalModule");
     public static final String UNKNOWN_EXTERNAL_MODULE_NAME = "<unknown>";
 
-    @Nullable
+    @NotNull
-    private final String[] files;
+    private final List<String> files;
 
     public LibrarySourcesConfig(@NotNull Project project,
             @NotNull String moduleId,
-            @Nullable String[] files,
+            @NotNull List<String> files,
             @NotNull EcmaVersion ecmaVersion) {
         super(project, moduleId, ecmaVersion);
         this.files = files;
@@ -56,7 +55,7 @@ public class LibrarySourcesConfig extends Config {
     @NotNull
     @Override
     public List<JetFile> generateLibFiles() {
-        if (files == null) {
+        if (files.isEmpty()) {
             return Collections.emptyList();
         }