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    
017    package org.jetbrains.k2js.translate.reference;
018    
019    import com.google.dart.compiler.backend.js.ast.JsConditional;
020    import com.google.dart.compiler.backend.js.ast.JsExpression;
021    import com.google.dart.compiler.backend.js.ast.JsLiteral;
022    import org.jetbrains.annotations.NotNull;
023    import org.jetbrains.annotations.Nullable;
024    import org.jetbrains.jet.lang.psi.JetDotQualifiedExpression;
025    import org.jetbrains.jet.lang.psi.JetQualifiedExpression;
026    import org.jetbrains.jet.lang.psi.JetSafeQualifiedExpression;
027    import org.jetbrains.k2js.translate.context.TemporaryConstVariable;
028    import org.jetbrains.k2js.translate.context.TranslationContext;
029    
030    import static org.jetbrains.k2js.translate.utils.TranslationUtils.isNotNullCheck;
031    
032    public enum CallType {
033        SAFE {
034            @NotNull
035            @Override
036            JsExpression constructCall(@Nullable JsExpression receiver, @NotNull CallConstructor constructor,
037                                       @NotNull TranslationContext context) {
038                assert receiver != null;
039    
040                TemporaryConstVariable tempVar = context.getOrDeclareTemporaryConstVariable(receiver);
041                return new JsConditional(isNotNullCheck(tempVar.value()), constructor.construct(tempVar.value()), JsLiteral.NULL);
042            }
043        },
044        //TODO: bang qualifier is not implemented in frontend for now
045        // BANG,
046        NORMAL {
047            @NotNull
048            @Override
049            JsExpression constructCall(@Nullable JsExpression receiver, @NotNull CallConstructor constructor,
050                                       @NotNull TranslationContext context) {
051                return constructor.construct(receiver);
052            }
053        };
054    
055        @NotNull
056        abstract JsExpression constructCall(@Nullable JsExpression receiver, @NotNull CallConstructor constructor,
057                                            @NotNull TranslationContext context);
058    
059        @NotNull
060        public static CallType getCallTypeForQualifiedExpression(@NotNull JetQualifiedExpression expression) {
061            if (expression instanceof JetSafeQualifiedExpression) {
062                return SAFE;
063            }
064            assert expression instanceof JetDotQualifiedExpression;
065            return NORMAL;
066        }
067    
068        public interface CallConstructor {
069            @NotNull
070            JsExpression construct(@Nullable JsExpression receiver);
071        }
072    
073    }