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.dart.compiler.backend.js.ast.JsExpression;
020    import com.google.dart.compiler.backend.js.ast.JsInvocation;
021    import com.google.dart.compiler.backend.js.ast.JsNameRef;
022    import com.google.dart.compiler.util.AstUtil;
023    import org.jetbrains.annotations.NotNull;
024    import org.jetbrains.annotations.Nullable;
025    import org.jetbrains.k2js.translate.context.TranslationContext;
026    import org.jetbrains.k2js.translate.intrinsic.functions.basic.BuiltInPropertyIntrinsic;
027    import org.jetbrains.k2js.translate.intrinsic.functions.basic.FunctionIntrinsic;
028    import org.jetbrains.k2js.translate.intrinsic.functions.patterns.DescriptorPredicate;
029    
030    import java.util.List;
031    
032    import static org.jetbrains.k2js.translate.intrinsic.functions.patterns.PatternBuilder.pattern;
033    import static org.jetbrains.k2js.translate.utils.JsAstUtils.setQualifier;
034    
035    public final class StringOperationFIF extends CompositeFIF {
036    
037        @NotNull
038        private static final DescriptorPredicate GET_PATTERN = pattern("String.get");
039    
040        @NotNull
041        private static final FunctionIntrinsic GET_INTRINSIC = new FunctionIntrinsic() {
042            @NotNull
043            @Override
044            public JsExpression apply(@Nullable JsExpression receiver,
045                    @NotNull List<JsExpression> arguments,
046                    @NotNull TranslationContext context) {
047                assert receiver != null;
048                assert arguments.size() == 1 : "String#get expression must have 1 argument.";
049                //TODO: provide better way
050                JsNameRef charAtReference = AstUtil.newQualifiedNameRef("charAt");
051                setQualifier(charAtReference, receiver);
052                return new JsInvocation(charAtReference, arguments);
053            }
054        };
055    
056        @NotNull
057        public static final FunctionIntrinsicFactory INSTANCE = new StringOperationFIF();
058    
059        private StringOperationFIF() {
060            add(GET_PATTERN, GET_INTRINSIC);
061            add(pattern("String.<get-length>"), new BuiltInPropertyIntrinsic("length"));
062            add(pattern("CharSequence.<get-length>"), new BuiltInPropertyIntrinsic("length"));
063        }
064    }