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Utility classes for Jetty
// ========================================================================
// Copyright (c) 2004-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
package org.eclipse.jetty.util;
import java.io.IOException;
import java.util.Arrays;
import java.util.NoSuchElementException;
import java.util.StringTokenizer;
/* ------------------------------------------------------------ */
/** StringTokenizer with Quoting support.
*
* This class is a copy of the java.util.StringTokenizer API and
* the behaviour is the same, except that single and double quoted
* string values are recognised.
* Delimiters within quotes are not considered delimiters.
* Quotes can be escaped with '\'.
*
* @see java.util.StringTokenizer
*
*/
public class QuotedStringTokenizer
extends StringTokenizer
{
private final static String __delim="\t\n\r";
private String _string;
private String _delim = __delim;
private boolean _returnQuotes=false;
private boolean _returnDelimiters=false;
private StringBuffer _token;
private boolean _hasToken=false;
private int _i=0;
private int _lastStart=0;
private boolean _double=true;
private boolean _single=true;
/* ------------------------------------------------------------ */
public QuotedStringTokenizer(String str,
String delim,
boolean returnDelimiters,
boolean returnQuotes)
{
super("");
_string=str;
if (delim!=null)
_delim=delim;
_returnDelimiters=returnDelimiters;
_returnQuotes=returnQuotes;
if (_delim.indexOf('\'')>=0 ||
_delim.indexOf('"')>=0)
throw new Error("Can't use quotes as delimiters: "+_delim);
_token=new StringBuffer(_string.length()>1024?512:_string.length()/2);
}
/* ------------------------------------------------------------ */
public QuotedStringTokenizer(String str,
String delim,
boolean returnDelimiters)
{
this(str,delim,returnDelimiters,false);
}
/* ------------------------------------------------------------ */
public QuotedStringTokenizer(String str,
String delim)
{
this(str,delim,false,false);
}
/* ------------------------------------------------------------ */
public QuotedStringTokenizer(String str)
{
this(str,null,false,false);
}
/* ------------------------------------------------------------ */
@Override
public boolean hasMoreTokens()
{
// Already found a token
if (_hasToken)
return true;
_lastStart=_i;
int state=0;
boolean escape=false;
while (_i<_string.length())
{
char c=_string.charAt(_i++);
switch (state)
{
case 0: // Start
if(_delim.indexOf(c)>=0)
{
if (_returnDelimiters)
{
_token.append(c);
return _hasToken=true;
}
}
else if (c=='\'' && _single)
{
if (_returnQuotes)
_token.append(c);
state=2;
}
else if (c=='\"' && _double)
{
if (_returnQuotes)
_token.append(c);
state=3;
}
else
{
_token.append(c);
_hasToken=true;
state=1;
}
break;
case 1: // Token
_hasToken=true;
if(_delim.indexOf(c)>=0)
{
if (_returnDelimiters)
_i--;
return _hasToken;
}
else if (c=='\'' && _single)
{
if (_returnQuotes)
_token.append(c);
state=2;
}
else if (c=='\"' && _double)
{
if (_returnQuotes)
_token.append(c);
state=3;
}
else
{
_token.append(c);
}
break;
case 2: // Single Quote
_hasToken=true;
if (escape)
{
escape=false;
_token.append(c);
}
else if (c=='\'')
{
if (_returnQuotes)
_token.append(c);
state=1;
}
else if (c=='\\')
{
if (_returnQuotes)
_token.append(c);
escape=true;
}
else
{
_token.append(c);
}
break;
case 3: // Double Quote
_hasToken=true;
if (escape)
{
escape=false;
_token.append(c);
}
else if (c=='\"')
{
if (_returnQuotes)
_token.append(c);
state=1;
}
else if (c=='\\')
{
if (_returnQuotes)
_token.append(c);
escape=true;
}
else
{
_token.append(c);
}
break;
}
}
return _hasToken;
}
/* ------------------------------------------------------------ */
@Override
public String nextToken()
throws NoSuchElementException
{
if (!hasMoreTokens() || _token==null)
throw new NoSuchElementException();
String t=_token.toString();
_token.setLength(0);
_hasToken=false;
return t;
}
/* ------------------------------------------------------------ */
@Override
public String nextToken(String delim)
throws NoSuchElementException
{
_delim=delim;
_i=_lastStart;
_token.setLength(0);
_hasToken=false;
return nextToken();
}
/* ------------------------------------------------------------ */
@Override
public boolean hasMoreElements()
{
return hasMoreTokens();
}
/* ------------------------------------------------------------ */
@Override
public Object nextElement()
throws NoSuchElementException
{
return nextToken();
}
/* ------------------------------------------------------------ */
/** Not implemented.
*/
@Override
public int countTokens()
{
return -1;
}
/* ------------------------------------------------------------ */
/** Quote a string.
* The string is quoted only if quoting is required due to
* embedded delimiters, quote characters or the
* empty string.
* @param s The string to quote.
* @param delim the delimiter to use to quote the string
* @return quoted string
*/
public static String quoteIfNeeded(String s, String delim)
{
if (s==null)
return null;
if (s.length()==0)
return "\"\"";
for (int i=0;i=0)
{
StringBuffer b=new StringBuffer(s.length()+8);
quote(b,s);
return b.toString();
}
}
return s;
}
/* ------------------------------------------------------------ */
/** Quote a string.
* The string is quoted only if quoting is required due to
* embeded delimiters, quote characters or the
* empty string.
* @param s The string to quote.
* @return quoted string
*/
public static String quote(String s)
{
if (s==null)
return null;
if (s.length()==0)
return "\"\"";
StringBuffer b=new StringBuffer(s.length()+8);
quote(b,s);
return b.toString();
}
private static final char[] escapes = new char[32];
static
{
Arrays.fill(escapes, (char)0xFFFF);
escapes['\b'] = 'b';
escapes['\t'] = 't';
escapes['\n'] = 'n';
escapes['\f'] = 'f';
escapes['\r'] = 'r';
}
/* ------------------------------------------------------------ */
/** Quote a string into an Appendable.
* The characters ", \, \n, \r, \t, \f and \b are escaped
* @param buffer The Appendable
* @param input The String to quote.
*/
public static void quote(Appendable buffer, String input)
{
try
{
buffer.append('"');
for (int i = 0; i < input.length(); ++i)
{
char c = input.charAt(i);
if (c >= 32)
{
if (c == '"' || c == '\\')
buffer.append('\\');
buffer.append(c);
}
else
{
char escape = escapes[c];
if (escape == 0xFFFF)
{
// Unicode escape
buffer.append('\\').append('u').append('0').append('0');
if (c < 0x10)
buffer.append('0');
buffer.append(Integer.toString(c, 16));
}
else
{
buffer.append('\\').append(escape);
}
}
}
buffer.append('"');
}
catch (IOException x)
{
throw new RuntimeException(x);
}
}
/* ------------------------------------------------------------ */
/** Quote a string into a StringBuffer only if needed.
* Quotes are forced if any delim characters are present.
*
* @param buf The StringBuffer
* @param s The String to quote.
* @param delim String of characters that must be quoted.
* @return true if quoted;
*/
public static boolean quoteIfNeeded(Appendable buf, String s,String delim)
{
for (int i=0;i=0)
{
quote(buf,s);
return true;
}
}
try
{
buf.append(s);
return false;
}
catch(IOException e)
{
throw new RuntimeException(e);
}
}
/* ------------------------------------------------------------ */
/** Unquote a string.
* @param s The string to unquote.
* @return quoted string
*/
public static String unquote(String s)
{
if (s==null)
return null;
if (s.length()<2)
return s;
char first=s.charAt(0);
char last=s.charAt(s.length()-1);
if (first!=last || (first!='"' && first!='\''))
return s;
StringBuilder b = new StringBuilder(s.length() - 2);
boolean escape=false;
for (int i=1;i