mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-13 03:29:50 +00:00
295 lines
7.0 KiB
Java
295 lines
7.0 KiB
Java
/* RTFScanner.java --
|
|
Copyright (C) 2005 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Classpath.
|
|
|
|
GNU Classpath is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Classpath is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GNU Classpath; see the file COPYING. If not, write to the
|
|
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 USA.
|
|
|
|
Linking this library statically or dynamically with other modules is
|
|
making a combined work based on this library. Thus, the terms and
|
|
conditions of the GNU General Public License cover the whole
|
|
combination.
|
|
|
|
As a special exception, the copyright holders of this library give you
|
|
permission to link this library with independent modules to produce an
|
|
executable, regardless of the license terms of these independent
|
|
modules, and to copy and distribute the resulting executable under
|
|
terms of your choice, provided that you also meet, for each linked
|
|
independent module, the terms and conditions of the license of that
|
|
module. An independent module is a module which is not derived from
|
|
or based on this library. If you modify this library, you may extend
|
|
this exception to your version of the library, but you are not
|
|
obligated to do so. If you do not wish to do so, delete this
|
|
exception statement from your version. */
|
|
|
|
|
|
package javax.swing.text.rtf;
|
|
|
|
import java.io.BufferedReader;
|
|
import java.io.IOException;
|
|
import java.io.InputStream;
|
|
import java.io.InputStreamReader;
|
|
import java.io.Reader;
|
|
|
|
/**
|
|
* Provides a scanner that scans an {@link InputStream} for tokens of the
|
|
* RTF syntax.
|
|
*
|
|
* This scanner is based upon the RTF specification 1.6
|
|
* available at:
|
|
*
|
|
* <a
|
|
* href="http://msdn.microsoft.com/library/en-us/dnrtfspec/html/rtfspec.asp">
|
|
* RTF specification at MSDN</a>
|
|
*
|
|
* @author Roman Kennke (roman@ontographics.com)
|
|
*/
|
|
class RTFScanner
|
|
{
|
|
|
|
/**
|
|
* The reader from which we read the RTF data.
|
|
*/
|
|
private Reader in;
|
|
|
|
/**
|
|
* This is used to constuct strings from the read in chars.
|
|
*/
|
|
private StringBuffer buffer;
|
|
|
|
/**
|
|
* Lookahead token.
|
|
*/
|
|
private Token lastToken;
|
|
|
|
/**
|
|
* Constructs a new RTFScanner without initializing the {@link Reader}.
|
|
*/
|
|
private RTFScanner()
|
|
{
|
|
buffer = new StringBuffer();
|
|
}
|
|
|
|
/**
|
|
* Constructs a new RTFScanner for the given {@link InputStream}.
|
|
* The stream is wrapped into an {@link InputStreamReader} and if it's
|
|
* not yet buffered then the Reader is wrapped in a {@link BufferedReader}
|
|
*
|
|
* @param stream the {@link InputStream} to read RTF data from
|
|
*/
|
|
public RTFScanner(InputStream stream)
|
|
{
|
|
this();
|
|
InputStreamReader reader = new InputStreamReader(stream);
|
|
in = new BufferedReader(reader);
|
|
}
|
|
|
|
/**
|
|
* Constructs a new RTFScanner for the given {@link Reader}.
|
|
*
|
|
* If the reader is not an instance of {@link BufferedReader} then it
|
|
* is wrapped into a BufferedReader.
|
|
*
|
|
* @param reader the {@link BufferedReader} to read RTF data from
|
|
*/
|
|
public RTFScanner(Reader reader)
|
|
{
|
|
this();
|
|
if (reader instanceof BufferedReader)
|
|
{
|
|
in = reader;
|
|
}
|
|
else
|
|
{
|
|
in = new BufferedReader(reader);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Reads in the next {@link Token} from the stream.
|
|
*
|
|
* @return the read {@link Token}
|
|
*
|
|
* @throws IOException if the underlying stream has problems
|
|
*/
|
|
private Token readTokenImpl()
|
|
throws IOException
|
|
{
|
|
Token token = null;
|
|
|
|
int c = in.read();
|
|
switch(c)
|
|
{
|
|
case -1:
|
|
token = new Token(Token.EOF);
|
|
break;
|
|
|
|
case '{':
|
|
token = new Token(Token.LCURLY);
|
|
break;
|
|
|
|
case '}':
|
|
token = new Token(Token.RCURLY);
|
|
break;
|
|
|
|
case '\\':
|
|
buffer.delete(0, buffer.length());
|
|
buffer.append((char) c);
|
|
token = readControlWord();
|
|
break;
|
|
|
|
default:
|
|
buffer.delete(0, buffer.length());
|
|
buffer.append((char) c);
|
|
token = readText();
|
|
break;
|
|
}
|
|
|
|
return token;
|
|
}
|
|
|
|
Token peekToken()
|
|
throws IOException
|
|
{
|
|
lastToken = readTokenImpl();
|
|
return lastToken;
|
|
}
|
|
|
|
Token readToken()
|
|
throws IOException
|
|
{
|
|
Token token;
|
|
if (lastToken != null)
|
|
{
|
|
token = lastToken;
|
|
lastToken = null;
|
|
}
|
|
else
|
|
token = readTokenImpl();
|
|
return token;
|
|
}
|
|
|
|
/**
|
|
* Reads in a control word and optional parameter.
|
|
*
|
|
* @return the read in control word as {@link ControlWordToken}
|
|
*
|
|
* @throws IOException if the underlying stream has problems
|
|
*/
|
|
private Token readControlWord()
|
|
throws IOException
|
|
{
|
|
// this flag indicates if we are still reading the name or are already
|
|
// in the parameter
|
|
boolean readingName = true;
|
|
String name = null;
|
|
String param = null;
|
|
|
|
while (true)
|
|
{
|
|
in.mark(1);
|
|
int c = in.read();
|
|
|
|
// check for 'a'..'z'
|
|
if (readingName && (c >= 'a') && (c <= 'z'))
|
|
{
|
|
buffer.append((char) c);
|
|
}
|
|
else if ((c >= '0') && (c <= '9'))
|
|
{
|
|
// if the last char was in the name, then finish reading the name
|
|
if (readingName)
|
|
{
|
|
name = buffer.toString();
|
|
buffer.delete(0, buffer.length());
|
|
readingName = false;
|
|
}
|
|
buffer.append((char) c);
|
|
}
|
|
else
|
|
{
|
|
// if we were in the name, then finish this
|
|
if (readingName)
|
|
{
|
|
name = buffer.toString();
|
|
}
|
|
// otherwise finish the parameter
|
|
else
|
|
{
|
|
param = buffer.toString();
|
|
}
|
|
|
|
// clear up
|
|
buffer.delete(0, buffer.length());
|
|
// reset input buffer to last char
|
|
in.reset();
|
|
// break while loop
|
|
break;
|
|
}
|
|
}
|
|
|
|
ControlWordToken token = null;
|
|
|
|
if (param == null)
|
|
token = new ControlWordToken(name);
|
|
else
|
|
token =new ControlWordToken(name, Integer.parseInt(param));
|
|
|
|
return token;
|
|
|
|
}
|
|
|
|
/**
|
|
* Reads in a block of text.
|
|
*
|
|
* @return the token for the text
|
|
*/
|
|
private Token readText()
|
|
throws IOException
|
|
{
|
|
|
|
boolean readingText = true;
|
|
while (readingText)
|
|
{
|
|
in.mark(1);
|
|
int c = in.read();
|
|
switch(c)
|
|
{
|
|
case '\\':
|
|
case '{':
|
|
case '}':
|
|
case -1:
|
|
readingText = false;
|
|
in.reset();
|
|
break;
|
|
|
|
default:
|
|
buffer.append((char) c);
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
String text = buffer.toString();
|
|
Token token = new TextToken(text);
|
|
|
|
buffer.delete(0, buffer.length());
|
|
|
|
return token;
|
|
|
|
}
|
|
}
|