jspreader.java

低版本的tomcat 对于有些老版本的应用还真的需要老版的中间件

	    ch = nextChar();
	    if (Character.toLowerCase((char) ch) != string.charAt(i++)) {
		reset(mark);
		return false;
	    }
	} while (i < string.length());
	reset(mark);
	return true;
    }

    public boolean matches(String string) throws ParseException {
	Mark mark = mark();
	int ch = 0;
	int i = 0;
	do {
	    ch = nextChar();
	    if (((char) ch) != string.charAt(i++)) {
		reset(mark);
		return false;
	    }
	} while (i < string.length());
	reset(mark);
	return true;
    }
    
    public void advance(int n) throws ParseException {
	while (--n >= 0)
	    nextChar();
    }

    public int skipSpaces() throws ParseException {
	int i = 0;
	while (isSpace()) {
	    i++;
	    nextChar();
	}
	return i;
    }

    /**
     * Skip until the given string is matched in the stream.
     * When returned, the context is positioned past the end of the match.
     * @param s The String to match.
     * @return A non-null <code>Mark</code> instance if found,
     * <strong>null</strong> otherwise.
     */
    public Mark skipUntil(String limit)
    throws ParseException {
	Mark ret = null;
	int limlen = limit.length();
	int ch;
	
    skip:
	for (ret = mark(), ch = nextChar() ; ch != -1 ; ret = mark(), ch = nextChar()) {
	    
	    if ( ch == limit.charAt(0) ) {
		for (int i = 1 ; i < limlen ; i++) {
		    if (Character.toLowerCase((char) nextChar()) != limit.charAt(i))
			continue skip;
		}
		return ret;
	    }
	}
	return null;
    }
    
    final boolean isSpace() {
	return peekChar() <= ' ';
    }

    /**
     * Parse a space delimited token.
     * If quoted the token will consume all characters up to a matching quote,
     * otherwise, it consumes up to the first delimiter character.
     * @param quoted If <strong>true</strong> accept quoted strings.
     */

    public String parseToken(boolean quoted) 
	throws ParseException
    {
	StringBuffer stringBuffer = new StringBuffer();
	skipSpaces();
	stringBuffer.setLength(0);
	
	int ch = peekChar();
	
	if (quoted) {
	    if ( ch == '"' || ch == '\'') {

		char endQuote = ch == '"' ? '"' : '\'';
		// Consume the open quote: 
		ch = nextChar();
		for(ch = nextChar(); ch != -1 && ch != endQuote; ch = nextChar()) {
		    if (ch == '\\') 
			ch = nextChar();
		    stringBuffer.append((char) ch);
		}
		// Check end of quote, skip closing quote:
		if ( ch == -1 ) 
		    throw new ParseException(mark(), 
				Constants.getString("jsp.error.quotes.unterminated"));
	    }
	    else throw new ParseException(mark(),
				Constants.getString("jsp.error.attr.quoted"));
	} else {
	    if (!isDelimiter())
		// Read value until delimiter is found:
		do {
		    ch = nextChar();
		    // Take care of the quoting here.
		    if (ch == '\\') {
			if (peekChar() == '"' || peekChar() == '\'' ||
			       peekChar() == '>' || peekChar() == '%')
			    ch = nextChar();
		    }
		    stringBuffer.append((char) ch);
		} while ( !isDelimiter() );
	}
	return stringBuffer.toString();
    }

    /**
     * Parse an attribute/value pair, and store it in provided hash table.
     * The attribute/value pair is defined by:
     * <pre>
     * av := spaces token spaces '=' spaces token spaces
     * </pre>
     * Where <em>token</em> is defined by <code>parseToken</code> and
     * <em>spaces</em> is defined by <code>skipSpaces</code>.
     * The name is always considered case insensitive, hence stored in its
     * lower case version.
     * @param into The Hashtable instance to save the result to.
     */

    private void parseAttributeValue(Hashtable into)
	throws ParseException
    {
	// Get the attribute name:
	skipSpaces();
	String name = parseToken(false);
	// Check for an equal sign:
	skipSpaces();
	if ( peekChar() != '=' ) 
	    throw new ParseException(mark(), Constants.getString("jsp.error.attr.novalue",
						new Object[] { name }));
	char ch = (char) nextChar();
	// Get the attribute value:
	skipSpaces();
	String value = parseToken(true);
	skipSpaces();
	// Add the binding to the provided hashtable:
	into.put(name, value);
	return;
    }

    /**
     * Parse some tag attributes for Beans.
     * The stream is assumed to be positioned right after the tag name. The
     * syntax recognized is:
     * <pre>
     * tag-attrs := empty | attr-list ("&gt;" | "--&gt;" | %&gt;)
     * attr-list := empty | av spaces attr-list
     * empty     := spaces 
     * </pre>
     * Where <em>av</em> is defined by <code>parseAttributeValue</code>.
     * @return A Hashtable mapping String instances (variable names) into
     * String instances (variable values).
     */

    public Hashtable parseTagAttributesBean() 
	throws ParseException
    {
      Hashtable values = new Hashtable(11);
	while ( true ) {
	    skipSpaces();
	    int ch = peekChar();
	    if ( ch == '>' ) {
		// End of the useBean tag.
		return values;

	    } else if ( ch == '/' ) {
		Mark mark = mark();
		nextChar();
		// XMLesque Close tags 
		try {
		    if ( nextChar() == '>' )
		      return values;
		} finally {
		    reset(mark);
		}
	    }
	    if ( ch == -1 )
		break;
	    // Parse as an attribute=value:
	    parseAttributeValue(values);
	}
	// Reached EOF:
	throw new ParseException(mark(),
			Constants.getString("jsp.error.tag.attr.unterminated"));
    }

    /**
     * Parse some tag attributes.
     * The stream is assumed to be positioned right after the tag name. The
     * syntax recognized is:
     * <pre>
     * tag-attrs := empty | attr-list ("&gt;" | "--&gt;" | %&gt;)
     * attr-list := empty | av spaces attr-list
     * empty     := spaces 
     * </pre>
     * Where <em>av</em> is defined by <code>parseAttributeValue</code>.
     * @return A Hashtable mapping String instances (variable names) into
     * String instances (variable values).
     */

    public Hashtable parseTagAttributes() 
	throws ParseException
    {
	Hashtable values = new Hashtable(11);
	while ( true ) {
	    skipSpaces();
	    int ch = peekChar();
	    if ( ch == '>' ) {
		return values;
	    }
	    if ( ch == '-' ) {
		Mark mark = mark();
		nextChar();
		// Close NCSA like attributes "->"
		try {
		    if ( nextChar() == '-' && nextChar() == '>' )
			return values;
		} finally {
		    reset(mark);
		}
	    } else if ( ch == '%' ) {
		Mark mark = mark();
		nextChar();
		// Close variable like attributes "%>"
		try {
		    if ( nextChar() == '>' )
			return values;
		} finally {
		    reset(mark);
		}
	    } else if ( ch == '/' ) {
		Mark mark = mark();
		nextChar();
		// XMLesque Close tags 
		try {
		    if ( nextChar() == '>' )
			return values;
		} finally {
		    reset(mark);
		}
	    }
	    if ( ch == -1 )
		break;
	    // Parse as an attribute=value:
	    parseAttributeValue(values);
	}
	// Reached EOF:
	throw new ParseException(mark(),
			Constants.getString("jsp.error.tag.attr.unterminated"));
    }

    /**
     * Parse PARAM tag attributes into the given hashtable.
     * Parses the PARAM tag as defined by:
     * <pre>
     * &lt;PARAM tag-attributes %gt;
     * </pre>
     * Two special tag attributes are recognized here:
     * <ol>
     * <li>The <strong>name</strong> attribute,
     * <li>The <strong>value</strong> attribute.
     * </ol>
     * The resulting name, value pair is stored in the provided hash table.
     * @param into Storage for parameter values.
     */
    public void parseParamTag(Hashtable into) 
	throws ParseException
    {
	// Really check for a param tag:
	if ( matches("param") ) {
	    advance(6);
	    parseParams (into);
	} else {
	    // False alarm, just skip it
	}
    }

    /**
     * Parse jsp:param tag attributes into the given hashtable.
     * Parses the jsp:param tag as defined by:
     * <pre>
     * &lt;jsp:param tag-attributes %gt;
     * </pre>
     * Two special tag attributes are recognized here:
     * <ol>
     * <li>The <strong>name</strong> attribute,
     * <li>The <strong>value</strong> attribute.
     * </ol>
     * The resulting name, value pair is stored in the provided hash table.
     * @param into Storage for parameter values.
     */
    public void parsePluginParamTag(Hashtable into) 
	throws ParseException
    {
	// Really check for a param tag:
	if ( matches("<jsp:param") ) {
	    advance(11);
	    parseParams (into);
	} else {
	    // False alarm, just skip it
	}
    }

    private void parseParams (Hashtable into) 
        throws ParseException
    {
	Hashtable attrs = parseTagAttributes();
	// Check attributes (name and value):
	String name  = (String) attrs.get("name");
	String value = (String) attrs.get("value");
	if ( name == null )
 	    throw new ParseException(mark(), Constants.getString("jsp.error.param.noname"));
	if ( value == null )
 	    throw new ParseException(mark(), Constants.getString("jsp.error.param.novalue"));
	// Put that new binding into the params hashatble:
	String oldval[] = (String[]) into.get(name);
	if ( oldval == null ) {
	    String newval[] = new String[1];
	    newval[0] = value;
	    into.put(name, newval);
	} else {
	    String newval[] = new String[oldval.length+1];
	    System.arraycopy(oldval, 0, newval, 0, oldval.length);
	    newval[oldval.length] = value;
	    into.put(name, newval);
        }
    }

    /**
     * Parse utils - Is current character a token delimiter ?
     * Delimiters are currently defined to be =, &gt;, &lt;, ", and ' or any
     * any space character as defined by <code>isSpace</code>.
     * @return A boolean.
     */
    private boolean isDelimiter() throws ParseException {
	if ( ! isSpace() ) {
	    int ch = peekChar();
	    // Look for a single-char work delimiter:
	    if ( ch == '=' || ch == '>' || ch == '"' || ch == '\'' || ch == '/') 
		return true;
	    // Look for an end-of-comment or end-of-tag:		
	    if ( ch == '-' ) {
		Mark mark = mark();
		if ( ((ch = nextChar()) == '>')
		     || ((ch == '-') && (nextChar() == '>')) ) {
		    reset(mark);
		    return true;
		} else {
		    reset(mark);
		    return false;
		}
	    }
	    return false;
	} else {
	    return true;
	}
    }
}