001    /*
002     * Copyright 2010-2012 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.js.compiler;
018    
019    import com.google.dart.compiler.backend.js.JsToStringGenerationVisitor;
020    import com.google.dart.compiler.backend.js.ast.*;
021    import com.google.dart.compiler.util.TextOutput;
022    import com.intellij.util.SmartList;
023    import org.jetbrains.annotations.Nullable;
024    import org.jetbrains.js.compiler.sourcemap.SourceMapBuilder;
025    
026    import java.util.List;
027    
028    public class JsSourceGenerationVisitor extends JsToStringGenerationVisitor implements TextOutput.OutListener {
029        @Nullable
030        private final SourceMapBuilder sourceMapBuilder;
031    
032        private final List<Object> pendingSources = new SmartList<Object>();
033    
034        public JsSourceGenerationVisitor(TextOutput out, @Nullable SourceMapBuilder sourceMapBuilder) {
035            super(out);
036            this.sourceMapBuilder = sourceMapBuilder;
037            out.setOutListener(this);
038        }
039    
040        @Override
041        public void visitProgramFragment(JsProgramFragment x) {
042            x.acceptChildren(this);
043        }
044    
045        @Override
046        public void newLined() {
047            if (sourceMapBuilder != null) {
048                sourceMapBuilder.newLine();
049            }
050        }
051    
052        @Override
053        public void indentedAfterNewLine() {
054            if (pendingSources.isEmpty()) return;
055    
056            assert sourceMapBuilder != null;
057            for (Object source : pendingSources) {
058                sourceMapBuilder.processSourceInfo(source);
059            }
060            pendingSources.clear();
061        }
062    
063        @Override
064        public void accept(JsNode node) {
065            if (!(node instanceof JsNameRef) && !(node instanceof JsLiteral.JsThisRef)) {
066                mapSource(node);
067            }
068            super.accept(node);
069        }
070    
071        private void mapSource(JsNode node) {
072            if (sourceMapBuilder != null) {
073                Object sourceInfo = node.getSource();
074                if (sourceInfo != null) {
075                    if (p.isJustNewlined()) {
076                        pendingSources.add(sourceInfo);
077                    }
078                    else {
079                        sourceMapBuilder.processSourceInfo(sourceInfo);
080                    }
081                }
082            }
083        }
084    
085        @Override
086        protected void beforeNodePrinted(JsNode node) {
087            mapSource(node);
088        }
089    
090        @Override
091        public void visitProgram(JsProgram program) {
092            program.acceptChildren(this);
093            if (sourceMapBuilder != null) {
094                sourceMapBuilder.addLink();
095            }
096        }
097    }