001/*
002 * Copyright 2010-2013 JetBrains s.r.o.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.jetbrains.k2js.translate.reference;
018
019import com.google.dart.compiler.backend.js.ast.JsExpression;
020import org.jetbrains.annotations.NotNull;
021import org.jetbrains.annotations.Nullable;
022import org.jetbrains.jet.lang.descriptors.DeclarationDescriptor;
023import org.jetbrains.jet.lang.descriptors.NamespaceDescriptor;
024import org.jetbrains.jet.lang.psi.*;
025import org.jetbrains.k2js.translate.context.TranslationContext;
026import org.jetbrains.k2js.translate.utils.ErrorReportingUtils;
027
028import static org.jetbrains.k2js.translate.general.Translation.translateAsExpression;
029import static org.jetbrains.k2js.translate.utils.BindingUtils.getDescriptorForReferenceExpression;
030import static org.jetbrains.k2js.translate.utils.PsiUtils.getNotNullSimpleNameSelector;
031import static org.jetbrains.k2js.translate.utils.PsiUtils.getSelector;
032
033public final class QualifiedExpressionTranslator {
034
035    private QualifiedExpressionTranslator() {
036    }
037
038    @NotNull
039    public static AccessTranslator getAccessTranslator(@NotNull JetQualifiedExpression expression,
040                                                       @NotNull TranslationContext context) {
041        JsExpression receiver = translateReceiver(expression, context);
042        PropertyAccessTranslator result =
043            PropertyAccessTranslator.newInstance(getNotNullSimpleNameSelector(expression), receiver,
044                                                 CallType.getCallTypeForQualifiedExpression(expression), context);
045        result.setCallType(CallType.getCallTypeForQualifiedExpression(expression));
046        return result;
047    }
048
049    @NotNull
050    public static JsExpression translateQualifiedExpression(@NotNull JetQualifiedExpression expression,
051                                                            @NotNull TranslationContext context) {
052        JsExpression receiver = translateReceiver(expression, context);
053        JetExpression selector = getSelector(expression);
054        CallType callType = CallType.getCallTypeForQualifiedExpression(expression);
055        return dispatchToCorrectTranslator(receiver, selector, callType, context);
056    }
057
058    @NotNull
059    private static JsExpression dispatchToCorrectTranslator(@Nullable JsExpression receiver,
060                                                            @NotNull JetExpression selector,
061                                                            @NotNull CallType callType,
062                                                            @NotNull TranslationContext context) {
063        if (PropertyAccessTranslator.canBePropertyGetterCall(selector, context)) {
064            assert selector instanceof JetSimpleNameExpression : "Selectors for properties must be simple names.";
065            return PropertyAccessTranslator.translateAsPropertyGetterCall
066                ((JetSimpleNameExpression)selector, receiver, callType, context);
067        }
068        if (selector instanceof JetCallExpression) {
069            return invokeCallExpressionTranslator(receiver, selector, callType, context);
070        }
071        //TODO: never get there
072        if (selector instanceof JetSimpleNameExpression) {
073            return ReferenceTranslator.translateSimpleName((JetSimpleNameExpression)selector, context);
074        }
075        throw new AssertionError("Unexpected qualified expression: " + selector.getText());
076    }
077
078    @NotNull
079    private static JsExpression invokeCallExpressionTranslator(@Nullable JsExpression receiver,
080            @NotNull JetExpression selector,
081            @NotNull CallType callType,
082            @NotNull TranslationContext context) {
083        try {
084            return CallExpressionTranslator.translate((JetCallExpression) selector, receiver, callType, context);
085        } catch (RuntimeException e) {
086            throw  ErrorReportingUtils.reportErrorWithLocation(selector, e);
087        }
088    }
089
090    @Nullable
091    private static JsExpression translateReceiver(@NotNull JetQualifiedExpression expression,
092                                                  @NotNull TranslationContext context) {
093        JetExpression receiverExpression = expression.getReceiverExpression();
094        if (isFullQualifierForExpression(receiverExpression, context)) {
095            return null;
096        }
097        return translateAsExpression(receiverExpression, context);
098    }
099
100    //TODO: prove correctness
101    private static boolean isFullQualifierForExpression(@Nullable JetExpression receiverExpression, @NotNull TranslationContext context) {
102        if (receiverExpression == null) {
103            return false;
104        }
105        if (receiverExpression instanceof JetReferenceExpression) {
106            DeclarationDescriptor descriptorForReferenceExpression =
107                getDescriptorForReferenceExpression(context.bindingContext(), (JetReferenceExpression)receiverExpression);
108            if (descriptorForReferenceExpression instanceof NamespaceDescriptor) {
109                return true;
110            }
111        }
112        if (receiverExpression instanceof JetQualifiedExpression) {
113            return isFullQualifierForExpression(((JetQualifiedExpression)receiverExpression).getSelectorExpression(), context);
114        }
115        return false;
116    }
117}