/*
* Copyright (c) 2013, the Dart project authors.
*
* Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.eclipse.org/legal/epl-v10.html
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.dart.engine.internal.task;
import com.google.dart.engine.context.AnalysisException;
import com.google.dart.engine.error.AnalysisError;
import com.google.dart.engine.internal.context.InternalAnalysisContext;
import com.google.dart.engine.internal.context.PerformanceStatistics;
import com.google.dart.engine.internal.context.RecordingErrorListener;
import com.google.dart.engine.scanner.CharSequenceReader;
import com.google.dart.engine.scanner.Scanner;
import com.google.dart.engine.scanner.Token;
import com.google.dart.engine.source.Source;
import com.google.dart.engine.utilities.general.TimeCounter.TimeCounterHandle;
import com.google.dart.engine.utilities.source.LineInfo;
/**
* Instances of the class {@code ScanDartTask} scan a specific source as a Dart file.
*/
public class ScanDartTask extends AnalysisTask {
/**
* The source to be scanned.
*/
private Source source;
/**
* The time at which the contents of the source were last modified.
*/
private long modificationTime;
/**
* The contents of the source.
*/
private CharSequence content;
/**
* The token stream that was produced by scanning the source.
*/
private Token tokenStream;
/**
* The line information that was produced.
*/
private LineInfo lineInfo;
/**
* The errors that were produced by scanning the source.
*/
private AnalysisError[] errors = AnalysisError.NO_ERRORS;
/**
* Initialize a newly created task to perform analysis within the given context.
*
* @param context the context in which the task is to be performed
* @param source the source to be parsed
* @param modificationTime the time at which the contents of the source were last modified
* @param content the contents of the source
*/
public ScanDartTask(InternalAnalysisContext context, Source source, long modificationTime,
CharSequence content) {
super(context);
this.source = source;
this.modificationTime = modificationTime;
this.content = content;
}
@Override
public <E> E accept(AnalysisTaskVisitor<E> visitor) throws AnalysisException {
return visitor.visitScanDartTask(this);
}
/**
* Return the errors that were produced by scanning the source, or {@code null} if the task has
* not yet been performed or if an exception occurred.
*
* @return the errors that were produced by scanning the source
*/
public AnalysisError[] getErrors() {
return errors;
}
/**
* Return the line information that was produced, or {@code null} if the task has not yet been
* performed or if an exception occurred.
*
* @return the line information that was produced
*/
public LineInfo getLineInfo() {
return lineInfo;
}
/**
* Return the time at which the contents of the source that was parsed were last modified, or a
* negative value if the task has not yet been performed or if an exception occurred.
*
* @return the time at which the contents of the source that was parsed were last modified
*/
public long getModificationTime() {
return modificationTime;
}
/**
* Return the source that is to be scanned.
*
* @return the source to be scanned
*/
public Source getSource() {
return source;
}
/**
* Return the token stream that was produced by scanning the source, or {@code null} if the task
* has not yet been performed or if an exception occurred.
*
* @return the token stream that was produced by scanning the source
*/
public Token getTokenStream() {
return tokenStream;
}
@Override
protected String getTaskDescription() {
if (source == null) {
return "scan as dart null source";
}
return "scan as dart " + source.getFullName();
}
@Override
protected void internalPerform() throws AnalysisException {
final RecordingErrorListener errorListener = new RecordingErrorListener();
TimeCounterHandle timeCounterScan = PerformanceStatistics.scan.start();
try {
Scanner scanner = new Scanner(source, new CharSequenceReader(content), errorListener);
scanner.setPreserveComments(getContext().getAnalysisOptions().getPreserveComments());
tokenStream = scanner.tokenize();
lineInfo = new LineInfo(scanner.getLineStarts());
errors = errorListener.getErrorsForSource(source);
} catch (Exception exception) {
throw new AnalysisException("Exception", exception);
} finally {
timeCounterScan.stop();
}
}
}