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/*
* Java HTML Tidy - JTidy
* HTML parser and pretty printer
*
* Copyright (c) 1998-2000 World Wide Web Consortium (Massachusetts
* Institute of Technology, Institut National de Recherche en
* Informatique et en Automatique, Keio University). All Rights
* Reserved.
*
* Contributing Author(s):
*
* Dave Raggett
* Andy Quick (translation to Java)
* Gary L Peskin (Java development)
* Sami Lempinen (release management)
* Fabrizio Giustina
*
* The contributing author(s) would like to thank all those who
* helped with testing, bug fixes, and patience. This wouldn't
* have been possible without all of you.
*
* COPYRIGHT NOTICE:
*
* This software and documentation is provided "as is," and
* the copyright holders and contributing author(s) make no
* representations or warranties, express or implied, including
* but not limited to, warranties of merchantability or fitness
* for any particular purpose or that the use of the software or
* documentation will not infringe any third party patents,
* copyrights, trademarks or other rights.
*
* The copyright holders and contributing author(s) will not be
* liable for any direct, indirect, special or consequential damages
* arising out of any use of the software or documentation, even if
* advised of the possibility of such damage.
*
* Permission is hereby granted to use, copy, modify, and distribute
* this source code, or portions hereof, documentation and executables,
* for any purpose, without fee, subject to the following restrictions:
*
* 1. The origin of this source code must not be misrepresented.
* 2. Altered versions must be plainly marked as such and must
* not be misrepresented as being the original source.
* 3. This Copyright notice may not be removed or altered from any
* source or altered source distribution.
*
* The copyright holders and contributing author(s) specifically
* permit, without fee, and encourage the use of this source code
* as a component for supporting the Hypertext Markup Language in
* commercial products. If you use this source code in a product,
* acknowledgment is not required but would be appreciated.
*
*/
package org.w3c.tidy;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
/**
* StreamIn Implementation using java writers.
* @author Fabrizio Giustina
* @version $Revision$ ($Author$)
*/
public class StreamInJavaImpl implements StreamIn
{
/**
* number of characters kept in buffer.
*/
private static final int CHARBUF_SIZE = 16;
/**
* character buffer.
*/
private int[] charbuf = new int[CHARBUF_SIZE];
/**
* actual position in buffer.
*/
private int bufpos;
/**
* Java input stream reader.
*/
private Reader reader;
/**
* has end of stream been reached?
*/
private boolean endOfStream;
/**
* Is char pushed?
*/
private boolean pushed;
/**
* current column number.
*/
private int curcol;
/**
* last column.
*/
private int lastcol;
/**
* current line number.
*/
private int curline;
/**
* tab size in chars.
*/
private int tabsize;
private int tabs;
/**
* Instantiates a new StreamInJavaImpl.
* @param stream the stream to read from
* @param encoding the streams text encoding
* @param tabsize the tab size
* @throws UnsupportedEncodingException if encoding not supported
*/
protected StreamInJavaImpl(InputStream stream, String encoding, int tabsize)
throws UnsupportedEncodingException {
reader = new InputStreamReader(stream, encoding);
this.pushed = false;
this.tabsize = tabsize;
this.curline = 1;
this.curcol = 1;
this.endOfStream = false;
}
/**
* Instantiates a new StreamInJavaImpl.
* @param reader the reader
* @param tabsize the tab size
*/
protected StreamInJavaImpl(Reader reader, int tabsize)
{
this.reader = reader;
this.pushed = false;
this.tabsize = tabsize;
this.curline = 1;
this.curcol = 1;
this.endOfStream = false;
}
/**
* @see org.w3c.tidy.StreamIn#readCharFromStream()
*/
@Override
public int readCharFromStream()
{
int c;
try
{
c = reader.read();
if (c < 0)
{
endOfStream = true;
}
}
catch (IOException e)
{
// TODO how to handle?
endOfStream = true;
return END_OF_STREAM;
}
return c;
}
/**
* @see org.w3c.tidy.StreamIn#readChar()
*/
@Override
public int readChar()
{
int c;
if (this.pushed)
{
c = this.charbuf[--(this.bufpos)];
if ((this.bufpos) == 0)
{
this.pushed = false;
}
if (c == '\n')
{
this.curcol = 1;
this.curline++;
return c;
}
this.curcol++;
return c;
}
this.lastcol = this.curcol;
if (this.tabs > 0)
{
this.curcol++;
this.tabs--;
return ' ';
}
c = readCharFromStream();
if (c < 0)
{
endOfStream = true;
return END_OF_STREAM;
}
if (c == '\n')
{
this.curcol = 1;
this.curline++;
return c;
}
else if (c == '\r') // \r\n
{
c = readCharFromStream();
if (c != '\n')
{
if (c != END_OF_STREAM)
{
ungetChar(c);
}
c = '\n';
}
this.curcol = 1;
this.curline++;
return c;
}
if (c == '\t') {
this.tabs = tabsize > 0 ?
this.tabsize - ((this.curcol - 1) % this.tabsize) - 1
: 0;
this.curcol++;
c = ' ';
return c;
}
this.curcol++;
return c;
}
/**
* @see org.w3c.tidy.StreamIn#ungetChar(int)
*/
@Override
public void ungetChar(int c)
{
this.pushed = true;
if (this.bufpos >= CHARBUF_SIZE)
{
// pop last element
System.arraycopy(this.charbuf, 0, this.charbuf, 1, CHARBUF_SIZE - 1);
this.bufpos--;
}
this.charbuf[(this.bufpos)++] = c;
if (c == '\n')
{
--this.curline;
}
this.curcol = this.lastcol;
}
/**
* @see org.w3c.tidy.StreamIn#isEndOfStream()
*/
@Override
public boolean isEndOfStream()
{
return endOfStream;
}
/**
* Getter for curcol.
* @return Returns the curcol.
*/
@Override
public int getCurcol()
{
return this.curcol;
}
/**
* Getter for curline.
* @return Returns the curline.
*/
@Override
public int getCurline()
{
return this.curline;
}
/**
* @see org.w3c.tidy.StreamIn#setLexer(org.w3c.tidy.Lexer)
*/
@Override
public void setLexer(Lexer lexer)
{
// unused in the java implementation
}
}
