-
-package java_cup;
-
-/** This class serves as the base class for entries in a parse action table.
- * Full entries will either be SHIFT(state_num), REDUCE(production), NONASSOC,
- * or ERROR. Objects of this base class will default to ERROR, while
- * the other three types will be represented by subclasses.
- *
- * @see java_cup.reduce_action
- * @see java_cup.shift_action
- * @version last updated: 7/2/96
- * @author Frank Flannery
- */
-
-public class parse_action {
-
- /*-----------------------------------------------------------*/
- /*--- Constructor(s) ----------------------------------------*/
- /*-----------------------------------------------------------*/
-
- /** Simple constructor. */
- public parse_action()
- {
- /* nothing to do in the base class */
- }
-
-
- /*-----------------------------------------------------------*/
- /*--- (Access to) Static (Class) Variables ------------------*/
- /*-----------------------------------------------------------*/
-
- /** Constant for action type -- error action. */
- public static final int ERROR = 0;
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Constant for action type -- shift action. */
- public static final int SHIFT = 1;
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Constants for action type -- reduce action. */
- public static final int REDUCE = 2;
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Constants for action type -- reduce action. */
- public static final int NONASSOC = 3;
-
- /*-----------------------------------------------------------*/
- /*--- General Methods ---------------------------------------*/
- /*-----------------------------------------------------------*/
-
- /** Quick access to the type -- base class defaults to error. */
- public int kind() {return ERROR;}
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Equality test. */
- public boolean equals(parse_action other)
- {
- /* we match all error actions */
- return other != null && other.kind() == ERROR;
- }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Generic equality test. */
- public boolean equals(Object other)
- {
- if (other instanceof parse_action)
- return equals((parse_action)other);
- else
- return false;
- }
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Compute a hash code. */
- public int hashCode()
- {
- /* all objects of this class hash together */
- return 0xCafe123;
- }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Convert to string. */
- public String toString() {return "ERROR";}
-
- /*-----------------------------------------------------------*/
-}
-