Lexer.java

package polyglot.lex;

/**
 * The interface "Lexer" describes lexers produced by JFlex for
 * Polyglot.
 */
public interface Lexer {

  /** This character denotes the end of file */
  final public static int YYEOF = -1;

  /**
   * The file being scanned, for use in constructing diagnostic
   * messages.
   */
  public String file();

  /**
   * Resumes scanning until the next regular expression is matched,
   * the end of input is encountered or an I/O-Error occurs.
   *
   * @return      the next token
   * @exception   IOException  if any I/O-Error occurs
   */
  public Token nextToken() throws java.io.IOException;
}