parserexception.java

是有关解释器的.用JAVA编写.可以解释一般的JAVA程序.

/**
 * This exception is generated for general errors during parsing, for instance,
 * if the anticipated token isn't there. Inherit from this exception to create
 * more specific and detailed error types. Use InterpreterException to show
 * problems during interpretation.
 * 
 * @see InterpreterException
 * @see ScannerException
 */
public class ParserException extends Exception {
    private int pos;

    private int line;

    private String text;

    /**
     * Instantiates a ParserException.
     * 
     * @param l
     *            The line where the error was found.
     * @param p
     *            The column where the error was found.
     * @param t
     *            an error description
     */
    ParserException(int l, int p, String t) {
        super("ParserException <" + t + "> at line " + l + " and position " + p
                + ".");

        line = l;
        pos = p;
        text = t;
    }

    /**
     * Returns the line where the error was found.
     * 
     * @return the error line.
     */
    int line() {
        return line;
    }

    /**
     * Returns the column where the error was found.
     * 
     * @return the error column.
     */
    int pos() {
        return pos;
    }

    /**
     * Returns the error description.
     * 
     * @return the error description
     */
    String text() {
        return text;
    }
}