Introduce some convenience methods related to EcmaVersion

js/js.tests/test/org/jetbrains/k2js/test/config/TestConfig.java

@@ -22,6 +22,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.jet.lang.psi.JetFile;
 import org.jetbrains.k2js.config.Config;
+import org.jetbrains.k2js.config.EcmaVersion;
 import org.jetbrains.k2js.utils.JetFileUtils;
 
 import java.io.FileInputStream;
@@ -36,12 +37,11 @@ import java.util.List;
 //TODO: review/refactor
 public final class TestConfig extends Config {
 
-
     @Nullable
     private /*var*/ List<JetFile> jsLibFiles = null;
 
     public TestConfig(@NotNull Project project) {
-        super(project, null);
+        super(project, EcmaVersion.v3);
     }
 
     @NotNull

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

@@ -34,7 +34,7 @@ public abstract class Config {
 
     @NotNull
     public static Config getEmptyConfig(@NotNull Project project, @Nullable String target) {
-        return new Config(project, target) {
+        return new Config(project, EcmaVersion.fromString(target)) {
             @NotNull
             @Override
             protected List<JetFile> generateLibFiles() {
@@ -70,9 +70,9 @@ public abstract class Config {
     @NotNull
     private final EcmaVersion target;
 
-    public Config(@NotNull Project project, @Nullable String target) {
+    public Config(@NotNull Project project, @NotNull EcmaVersion ecmaVersion) {
         this.project = project;
-        this.target = EcmaVersion.fromString(target);
+        this.target = ecmaVersion;
     }
 
     @NotNull

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

@@ -27,7 +27,12 @@ public enum EcmaVersion {
     v3, v5;
 
     @NotNull
-    static EcmaVersion fromString(@Nullable String target) {
+    public static EcmaVersion fromString(@Nullable String target) {
         return StringUtil.compareVersionNumbers(target, "5") >= 0 ? v5 : v3;
     }
+
+    @NotNull
+    public static EcmaVersion defaultVersion() {
+        return v3;
+    }
 }

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

@@ -40,8 +40,8 @@ public class ZippedLibrarySourcesConfig extends Config {
     @Nullable
     protected final String pathToLibZip;
 
-    public ZippedLibrarySourcesConfig(@NotNull Project project, @Nullable String pathToZip, @Nullable String target) {
-        super(project, target);
+    public ZippedLibrarySourcesConfig(@NotNull Project project, @Nullable String pathToZip, @NotNull EcmaVersion ecmaVersion) {
+        super(project, ecmaVersion);
         pathToLibZip = pathToZip;
     }