/*
* Copyright 2013 Alex Lin.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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 org.opoo.press.source.impl;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.LineIterator;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.opoo.press.source.NoFrontMatterException;
import org.opoo.press.source.Source;
import org.opoo.press.source.SourceEntry;
import org.opoo.press.source.SourceParser;
import org.yaml.snakeyaml.Yaml;
/**
* @author Alex Lin
*
*/
public class SourceParserImpl implements SourceParser {
private static final Logger log = LoggerFactory.getLogger(SourceParserImpl.class);
private Yaml yaml = new Yaml();
/**
* @return the yaml
*/
public Yaml getYaml() {
return yaml;
}
/**
* @param yaml the yaml to set
*/
public void setYaml(Yaml yaml) {
this.yaml = yaml;
}
/* (non-Javadoc)
* @see org.opoo.press.source.SourceParser#parse(org.opoo.press.source.SourceEntry)
*/
@Override
public Source parse(SourceEntry sourceEntry) throws NoFrontMatterException {
List<String> metaLines = new ArrayList<String>();
List<String> contentLines = new ArrayList<String>();
InputStream stream = null;
List<String> currentList = metaLines;
try {
stream = new FileInputStream(sourceEntry.getFile());
LineIterator iterator = IOUtils.lineIterator(stream, "UTF-8");
if(!iterator.hasNext()){
throw new RuntimeException("File not content: " + sourceEntry.getFile());
}
String line = iterator.next();
if(!isFrontMatterStartLine(line, sourceEntry)){
log.debug("Maybe a static file: " + sourceEntry.getFile());
throw new NoFrontMatterException(sourceEntry);
}
boolean hasFrontMatterEndLine = false;
//process headers
while(iterator.hasNext()){
line = iterator.next();
if(isFrontMatterEndLine(line)){
hasFrontMatterEndLine = true;
currentList = contentLines;
continue;
}
currentList.add(line);
}
if(!hasFrontMatterEndLine){
log.debug("Maybe a static file: " + sourceEntry.getFile());
throw new NoFrontMatterException(sourceEntry);
}
} catch (IOException e) {
throw new RuntimeException(e);
}finally{
IOUtils.closeQuietly(stream);
}
StringWriter metaWriter = new StringWriter();
StringWriter contentWriter = new StringWriter();
try {
IOUtils.writeLines(metaLines, null, metaWriter);
IOUtils.writeLines(contentLines, null, contentWriter);
} catch (IOException e) {
throw new RuntimeException(e);
}finally{
IOUtils.closeQuietly(contentWriter);
IOUtils.closeQuietly(metaWriter);
}
@SuppressWarnings("unchecked")
Map<String, Object> map = (Map<String, Object>) yaml.load(metaWriter.toString());
String content = contentWriter.toString();
return new SimpleSource(sourceEntry, map, content);
}
private static boolean isFrontMatterStartLine(String line, SourceEntry sourceEntry){
if( Source.TRIPLE_DASHED_LINE.equals(line)){
return true;
}
if(line.length() == 4){
if(65279 == line.charAt(0) && Source.TRIPLE_DASHED_LINE.equals(line.substring(1))){
log.debug("UTF-8 with BOM file: " + sourceEntry.getFile());
return true;
}
}
return false;
}
private static boolean isFrontMatterEndLine(String line){
return Source.TRIPLE_DASHED_LINE.equals(line);
}
}