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.intrinsic.functions.factories;
018    
019    import com.google.common.base.Predicate;
020    import com.google.common.collect.Lists;
021    import com.google.dart.compiler.backend.js.ast.JsExpression;
022    import com.google.dart.compiler.backend.js.ast.JsNameRef;
023    import com.intellij.openapi.util.Pair;
024    import org.jetbrains.annotations.NotNull;
025    import org.jetbrains.annotations.Nullable;
026    import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
027    import org.jetbrains.k2js.translate.context.TranslationContext;
028    import org.jetbrains.k2js.translate.intrinsic.functions.basic.BuiltInPropertyIntrinsic;
029    import org.jetbrains.k2js.translate.intrinsic.functions.basic.FunctionIntrinsic;
030    import org.jetbrains.k2js.translate.utils.JsAstUtils;
031    
032    import java.util.List;
033    
034    public abstract class CompositeFIF implements FunctionIntrinsicFactory {
035        @NotNull
036        public static final FunctionIntrinsic LENGTH_PROPERTY_INTRINSIC = new BuiltInPropertyIntrinsic("length");
037        public static final FunctionIntrinsic IS_EMPTY_INTRINSIC = new FunctionIntrinsic() {
038            @NotNull
039            @Override
040            public JsExpression apply(
041                    @Nullable JsExpression receiver, @NotNull List<JsExpression> arguments, @NotNull TranslationContext context
042            ) {
043                assert receiver != null;
044                return JsAstUtils.equality(new JsNameRef("length", receiver), context.program().getNumberLiteral(0));
045            }
046        };
047    
048        @NotNull
049        private final List<Pair<Predicate<FunctionDescriptor>, FunctionIntrinsic>> patternsAndIntrinsics = Lists.newArrayList();
050    
051        protected CompositeFIF() {
052        }
053    
054        @Nullable
055        @Override
056        public FunctionIntrinsic getIntrinsic(@NotNull FunctionDescriptor descriptor) {
057            for (Pair<Predicate<FunctionDescriptor>, FunctionIntrinsic> entry : patternsAndIntrinsics) {
058                if (entry.first.apply(descriptor)) {
059                    return entry.second;
060                }
061            }
062            return null;
063        }
064    
065        protected void add(@NotNull Predicate<FunctionDescriptor> pattern, @NotNull FunctionIntrinsic intrinsic) {
066            patternsAndIntrinsics.add(Pair.create(pattern, intrinsic));
067        }
068     }