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.operation;
018
019import com.google.dart.compiler.backend.js.ast.JsConditional;
020import com.google.dart.compiler.backend.js.ast.JsExpression;
021import org.jetbrains.annotations.NotNull;
022import org.jetbrains.jet.lang.psi.JetUnaryExpression;
023import org.jetbrains.jet.lexer.JetTokens;
024import org.jetbrains.k2js.translate.context.TemporaryConstVariable;
025import org.jetbrains.k2js.translate.context.TranslationContext;
026import org.jetbrains.k2js.translate.reference.CallBuilder;
027import org.jetbrains.k2js.translate.reference.CallType;
028import org.jetbrains.k2js.translate.utils.TranslationUtils;
029
030import java.util.Collections;
031
032import static org.jetbrains.k2js.translate.general.Translation.translateAsExpression;
033import static org.jetbrains.k2js.translate.utils.BindingUtils.getResolvedCall;
034import static org.jetbrains.k2js.translate.utils.PsiUtils.getBaseExpression;
035import static org.jetbrains.k2js.translate.utils.PsiUtils.getOperationToken;
036import static org.jetbrains.k2js.translate.utils.TranslationUtils.isNotNullCheck;
037
038
039public final class UnaryOperationTranslator {
040    private UnaryOperationTranslator() {
041    }
042
043    @NotNull
044    public static JsExpression translate(@NotNull JetUnaryExpression expression,
045                                         @NotNull TranslationContext context) {
046        if (isExclExcl(expression)) {
047            return translateExclExclOperator(expression, context);
048        }
049        if (IncrementTranslator.isIncrement(expression)) {
050            return IncrementTranslator.translate(expression, context);
051        }
052        return translateAsCall(expression, context);
053    }
054
055    private static boolean isExclExcl(@NotNull JetUnaryExpression expression) {
056        return getOperationToken(expression).equals(JetTokens.EXCLEXCL);
057    }
058
059    @NotNull
060    private static JsExpression translateExclExclOperator(@NotNull JetUnaryExpression expression, @NotNull TranslationContext context) {
061        JsExpression translatedExpression = translateAsExpression(getBaseExpression(expression), context);
062        TemporaryConstVariable tempVar = context.getOrDeclareTemporaryConstVariable(translatedExpression);
063
064        JsConditional ensureNotNull = new JsConditional(isNotNullCheck(tempVar.value()), tempVar.value(), context.namer().throwNPEFunctionCall());
065
066        // associate (cache) ensureNotNull expression to new LazyValue with same name.
067        context.associateExpressionToLazyValue(ensureNotNull, new TemporaryConstVariable(tempVar.name(), ensureNotNull));
068        return ensureNotNull;
069    }
070
071    @NotNull
072    private static JsExpression translateAsCall(@NotNull JetUnaryExpression expression,
073                                                @NotNull TranslationContext context) {
074        return CallBuilder.build(context)
075                .receiver(TranslationUtils.translateBaseExpression(context, expression))
076                .args(Collections.<JsExpression>emptyList())
077                .resolvedCall(getResolvedCall(context.bindingContext(), expression.getOperationReference()))
078                .type(CallType.NORMAL).translate();
079    }
080}