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.intrinsic.functions.factories;
018
019import com.google.dart.compiler.backend.js.ast.JsExpression;
020import com.google.dart.compiler.backend.js.ast.JsInvocation;
021import com.google.dart.compiler.backend.js.ast.JsNameRef;
022import com.google.dart.compiler.util.AstUtil;
023import org.jetbrains.annotations.NotNull;
024import org.jetbrains.annotations.Nullable;
025import org.jetbrains.k2js.translate.context.TranslationContext;
026import org.jetbrains.k2js.translate.intrinsic.functions.basic.BuiltInPropertyIntrinsic;
027import org.jetbrains.k2js.translate.intrinsic.functions.basic.FunctionIntrinsic;
028import org.jetbrains.k2js.translate.intrinsic.functions.patterns.DescriptorPredicate;
029
030import java.util.List;
031
032import static org.jetbrains.k2js.translate.intrinsic.functions.patterns.PatternBuilder.pattern;
033import static org.jetbrains.k2js.translate.utils.JsAstUtils.setQualifier;
034
035public 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}