supported array access expressions.

translator/src/org/jetbrains/k2js/translate/expression/ExpressionVisitor.java

@@ -13,6 +13,7 @@ import org.jetbrains.k2js.translate.general.TranslationContext;
 import org.jetbrains.k2js.translate.general.TranslatorVisitor;
 import org.jetbrains.k2js.translate.operation.BinaryOperationTranslator;
 import org.jetbrains.k2js.translate.operation.UnaryOperationTranslator;
+import org.jetbrains.k2js.translate.reference.ArrayAccessTranslator;
 import org.jetbrains.k2js.translate.reference.PropertyAccessTranslator;
 import org.jetbrains.k2js.translate.reference.ReferenceTranslator;
 import org.jetbrains.k2js.translate.utils.BindingUtils;
@@ -189,9 +190,7 @@ public final class ExpressionVisitor extends TranslatorVisitor<JsNode> {
     private JsExpression translateConditionExpression(@Nullable JetExpression expression,
                                                       @NotNull TranslationContext context) {
         JsExpression jsCondition = translateNullableExpression(expression, context);
-        if (jsCondition == null) {
+        assert (jsCondition != null) : "Condition should not be empty";
-            throw new AssertionError("Empty condition!");
-        }
         return AstUtil.convertToExpression(jsCondition);
     }
 
@@ -385,5 +384,12 @@ public final class ExpressionVisitor extends TranslatorVisitor<JsNode> {
         return new JsThisRef();
     }
 
+    @Override
+    @NotNull
+    public JsInvocation visitArrayAccessExpression(@NotNull JetArrayAccessExpression expression,
+                                                   @NotNull TranslationContext context) {
+        return ArrayAccessTranslator.translateAsArrayGetterCall(expression, context);
+    }
+
 
 }

translator/src/org/jetbrains/k2js/translate/operation/BinaryOperationTranslator.java

@@ -10,6 +10,7 @@ import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
 import org.jetbrains.jet.lexer.JetToken;
 import org.jetbrains.k2js.translate.general.Translation;
 import org.jetbrains.k2js.translate.general.TranslationContext;
+import org.jetbrains.k2js.translate.reference.ArrayAccessTranslator;
 import org.jetbrains.k2js.translate.reference.PropertyAccessTranslator;
 
 /**
@@ -48,6 +49,9 @@ public final class BinaryOperationTranslator extends OperationTranslator {
 
     @NotNull
     JsExpression translate() {
+        if (ArrayAccessTranslator.canBeArraySetterCall(expression)) {
+            return ArrayAccessTranslator.translateAsArraySetterCall(expression, context());
+        }
         if (isCompareTo()) {
             return asCompareToOverload();
         }

translator/src/org/jetbrains/k2js/translate/reference/ArrayAccessTranslator.java

@@ -0,0 +1,106 @@
+package org.jetbrains.k2js.translate.reference;
+
+import com.google.dart.compiler.backend.js.ast.JsExpression;
+import com.google.dart.compiler.backend.js.ast.JsInvocation;
+import com.google.dart.compiler.backend.js.ast.JsNameRef;
+import com.google.dart.compiler.util.AstUtil;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
+import org.jetbrains.jet.lang.psi.JetArrayAccessExpression;
+import org.jetbrains.jet.lang.psi.JetBinaryExpression;
+import org.jetbrains.jet.lang.psi.JetExpression;
+import org.jetbrains.jet.lexer.JetToken;
+import org.jetbrains.k2js.translate.general.AbstractTranslator;
+import org.jetbrains.k2js.translate.general.Translation;
+import org.jetbrains.k2js.translate.general.TranslationContext;
+import org.jetbrains.k2js.translate.operation.OperatorTable;
+import org.jetbrains.k2js.translate.utils.BindingUtils;
+import org.jetbrains.k2js.translate.utils.TranslationUtils;
+
+import java.util.List;
+
+/**
+ * @author Talanov Pavel
+ */
+public final class ArrayAccessTranslator extends AbstractTranslator {
+
+
+    public static boolean canBeArraySetterCall(@NotNull JetBinaryExpression expression) {
+        //TODO: move unsafe cat to util
+        return (OperatorTable.isAssignment((JetToken) expression.getOperationToken())
+                && (expression.getLeft() instanceof JetArrayAccessExpression));
+    }
+
+    public static JsInvocation translateAsArrayGetterCall(@NotNull JetArrayAccessExpression expression,
+                                                          @NotNull TranslationContext context) {
+        return (new ArrayAccessTranslator(expression, null, context)).translateAsArrayGet();
+    }
+
+    public static JsInvocation translateAsArraySetterCall(@NotNull JetBinaryExpression expression,
+                                                          @NotNull TranslationContext context) {
+        JetExpression arrayAccess = expression.getLeft();
+        assert (arrayAccess instanceof JetArrayAccessExpression) : "Check with canBeArraySetterCall";
+        JetExpression right = expression.getRight();
+        assert right != null : "Binary expression should have a right expression";
+        JsExpression expressionToSetTo = Translation.translateAsExpression(right, context);
+        return (new ArrayAccessTranslator((JetArrayAccessExpression) arrayAccess, expressionToSetTo, context))
+                .translateAsArraySet();
+    }
+
+    @NotNull
+    private final JetArrayAccessExpression expression;
+    @NotNull
+    private final DeclarationDescriptor methodDescriptor;
+    @Nullable
+    private final JsExpression expressionToSetTo;
+
+
+    private ArrayAccessTranslator(@NotNull JetArrayAccessExpression expression,
+                                  @Nullable JsExpression expressionToSetTo,
+                                  @NotNull TranslationContext context) {
+        super(context);
+        this.expression = expression;
+        DeclarationDescriptor descriptorForReferenceExpression =
+                BindingUtils.getDescriptorForReferenceExpression(context.bindingContext(), expression);
+        assert descriptorForReferenceExpression != null : "Array access expression must reference a descriptor";
+        this.methodDescriptor = descriptorForReferenceExpression;
+        this.expressionToSetTo = expressionToSetTo;
+    }
+
+    @NotNull
+    private JsInvocation translateAsArrayGet() {
+        return translateAsArrayAccessWithIndices();
+    }
+
+    private JsInvocation translateAsArrayAccessWithIndices() {
+        JsNameRef accessMethodReference = getAccessMethodReference();
+        AstUtil.setQualifier(accessMethodReference, translateArrayExpression());
+        return AstUtil.newInvocation(accessMethodReference, translateIndexExpressions());
+    }
+
+    @NotNull
+    private JsInvocation translateAsArraySet() {
+        assert expressionToSetTo != null;
+        JsInvocation setCall = translateAsArrayAccessWithIndices();
+        setCall.getArguments().add(expressionToSetTo);
+        return setCall;
+    }
+
+    @NotNull
+    private List<JsExpression> translateIndexExpressions() {
+        return TranslationUtils.translateExpressionList(context(), expression.getIndexExpressions());
+    }
+
+    @NotNull
+    private JsNameRef getAccessMethodReference() {
+        return context().getNameForDescriptor(methodDescriptor).makeRef();
+    }
+
+    @NotNull
+    private JsExpression translateArrayExpression() {
+        return Translation.translateAsExpression(expression.getArrayExpression(), context());
+    }
+
+
+}

translator/src/org/jetbrains/k2js/translate/utils/TranslationUtils.java

@@ -167,4 +167,14 @@ public final class TranslationUtils {
         }
         return qualifier;
     }
+
+    @NotNull
+    public static List<JsExpression> translateExpressionList(@NotNull TranslationContext context,
+                                                             @NotNull List<JetExpression> expressions) {
+        List<JsExpression> result = new ArrayList<JsExpression>();
+        for (JetExpression expression : expressions) {
+            result.add(Translation.translateAsExpression(expression, context));
+        }
+        return result;
+    }
 }

translator/test/org/jetbrains/k2js/test/StandardClassesTest.java

@@ -17,4 +17,9 @@ public class StandardClassesTest extends TranslationTest {
     public void array() throws Exception {
         testFooBoxIsTrue("array.kt");
     }
+
+    @Test
+    public void arrayAccess() throws Exception {
+        testFooBoxIsTrue("arrayAccess.kt");
+    }
 }

translator/testFiles/kotlin_lib.js

@@ -452,10 +452,10 @@ Kotlin.Array = Class.create({
         this.array = [];
     },
     get:function (index) {
-        return this.array[index];
+        return (this.array)[index];
     },
     set:function (index, value) {
-        this.array[index] = value;
+        (this.array)[index] = value;
     }
 })
 

translator/testFiles/standardClasses/cases/arrayAccess.kt

@@ -0,0 +1,8 @@
+namespace foo
+
+fun box() : Boolean {
+    val a = Array<Int>(4)
+    a[1] = 2
+    a[2] = 3
+    return a.get(1) == 2
+}