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A command line parser for Java
package com.obdobion.argument.input;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import com.obdobion.argument.type.ICmdLineArg;
/**
* XmlParser class.
*
* @author Chris DeGreef [email protected]
*/
public class XmlParser extends AbstractInputParser implements IParserInput
{
final static private String rootTag = "cmdline";
final static private String nonameTag = "noname";
final static private String delimAttr = "delim";
/**
* getInstance.
*
* @param file a {@link java.io.File} object.
* @return a {@link com.obdobion.argument.input.IParserInput} object.
* @throws java.io.IOException if any.
*/
static public IParserInput getInstance(final File file) throws IOException
{
final XmlParser parser = new XmlParser();
parser.input = new FileInputStream(file);
return parser;
}
/**
* getInstance.
*
* @param input a {@link java.io.InputStream} object.
* @return a {@link com.obdobion.argument.input.IParserInput} object.
*/
static public IParserInput getInstance(final InputStream input)
{
final XmlParser parser = new XmlParser();
parser.input = input;
return parser;
}
/**
* getInstance.
*
* @param input a {@link java.lang.String} object.
* @return a {@link com.obdobion.argument.input.IParserInput} object.
*/
static public IParserInput getInstance(final String input)
{
final InputStream is = new ByteArrayInputStream(input.getBytes());
final XmlParser parser = new XmlParser();
parser.input = is;
return parser;
}
/**
* getInstance.
*
* @param input a {@link java.lang.String} object.
* @return a {@link com.obdobion.argument.input.IParserInput} object.
*/
static public IParserInput getInstance(final String... input)
{
final StringBuilder sb = new StringBuilder();
for (final String aLine : input)
sb.append(aLine);
final InputStream is = new ByteArrayInputStream(sb.toString().getBytes());
final XmlParser parser = new XmlParser();
parser.input = is;
return parser;
}
/** {@inheritDoc} */
static protected String quote(final String value)
{
final StringBuilder out = new StringBuilder();
out.append(value.replaceAll("<", "<").replaceAll(">", ">"));
return out.toString();
}
/**
* unparseTokens.
*
* @param args a {@link java.util.List} object.
* @return a {@link java.lang.String} object.
*/
static public String unparseTokens(final List> args)
{
final StringBuilder out = new StringBuilder();
out.append("<").append(rootTag).append(">");
unparseTokens(args, out);
out.append("");
return out.toString();
}
/**
* unparseTokens.
*
* @param args a {@link java.util.List} object.
* @param out a {@link java.lang.StringBuilder} object.
*/
static public void unparseTokens(final List> args, final StringBuilder out)
{
final Iterator> aIter = args.iterator();
while (aIter.hasNext())
{
final ICmdLineArg arg = aIter.next();
if (arg.isParsed())
arg.exportXml(out);
}
}
InputStream input;
final char commandPrefix = '-';
private XmlParser()
{
super();
}
/** {@inheritDoc} */
@Override
public Token[] parseTokens()
{
final List out = new ArrayList<>();
final List depth = new ArrayList<>();
final List line = new ArrayList<>();
final NodeOc closeGroup = new NodeOc();
closeGroup.key = CLOSE_GROUP;
closeGroup.occurrance = -1;
final SAXParserFactory factory = SAXParserFactory.newInstance();
try
{
final SAXParser parser = factory.newSAXParser();
parser.parse(input, new DefaultHandler()
{
StringBuilder value;
int nodeCounter = -1;
String delim = null;
@Override
public void characters(final char[] ch, final int start, final int length) throws SAXException
{
for (int c = start; c < start + length; c++)
/*
* Extra spaces between tags end up here. I guess this
* could be comments too. Who cares, ignore it. The
* value gets assigned when a tag actually starts.
*/
if (value != null)
value.append(ch[c]);
}
@Override
public void endDocument() throws SAXException
{
for (int d = 1; d < depth.size(); d++)
line.add(closeGroup);
}
/**
* @param uri
* @param localName
*/
@Override
public void endElement(final String uri, final String localName, final String name)
throws SAXException
{
if (rootTag.equals(name))
return;
if (value != null)
{
if (delim == null)
buildTokens(commandPrefix, out, depth, line, value.toString());
else
{
final String[] parts = value.toString().split(delim);
for (final String part : parts)
buildTokens(commandPrefix, out, depth, line, part);
}
value = null;
}
line.remove(line.size() - 1);
}
@Override
public void startDocument() throws SAXException
{
super.startDocument();
}
/**
* @param uri
* @param localName
*/
@Override
public void startElement(final String uri, final String localName, final String name,
final Attributes attributes) throws SAXException
{
if (rootTag.equals(name))
return;
value = new StringBuilder();
{
final NodeOc newNode = new NodeOc();
if (nonameTag.equalsIgnoreCase(name))
newNode.key = "";
else
newNode.key = name;
newNode.occurrance = nodeCounter++;
line.add(newNode);
}
for (int a = 0; a < attributes.getLength(); a++)
{
if (delimAttr.equalsIgnoreCase(attributes.getQName(a)))
{
delim = attributes.getValue(a);
continue;
}
final NodeOc aNode = new NodeOc();
if (nonameTag.equalsIgnoreCase(attributes.getQName(a)))
aNode.key = "";
else
aNode.key = attributes.getQName(a);
aNode.occurrance = nodeCounter++;
line.add(aNode);
buildTokens(commandPrefix, out, depth, line, attributes.getValue(a));
line.remove(aNode);
}
}
});
for (int d = 1; d < depth.size(); d++)
out.add(new Token(commandPrefix, CLOSE_GROUP, 0, 0, false));
return out.toArray(new Token[out.size()]);
} catch (final ParserConfigurationException e)
{
e.printStackTrace();
return null;
} catch (final SAXException e)
{
e.printStackTrace();
return null;
} catch (final IOException e)
{
e.printStackTrace();
return null;
}
}
/** {@inheritDoc} */
@Override
public String substring(final int inclusiveStart, final int exclusiveEnd)
{
return "";
}
}
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