--- /dev/null
+
+package java_cup;
+
+/**
+ * This class represents a part of a production which contains an
+ * action. These are eventually eliminated from productions and converted
+ * to trailing actions by factoring out with a production that derives the
+ * empty string (and ends with this action).
+ *
+ * @see java_cup.production
+ * @version last update: 11/25/95
+ * @author Scott Hudson
+ */
+
+public class action_part extends production_part {
+
+ /*-----------------------------------------------------------*/
+ /*--- Constructors ------------------------------------------*/
+ /*-----------------------------------------------------------*/
+
+ /** Simple constructor.
+ * @param code_str string containing the actual user code.
+ */
+ public action_part(String code_str)
+ {
+ super(/* never have a label on code */null);
+ _code_string = code_str;
+ }
+
+ /*-----------------------------------------------------------*/
+ /*--- (Access to) Instance Variables ------------------------*/
+ /*-----------------------------------------------------------*/
+
+ /** String containing code for the action in question. */
+ protected String _code_string;
+
+ /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+ /** String containing code for the action in question. */
+ public String code_string() {return _code_string;}
+
+ /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+ /** Set the code string. */
+ public void set_code_string(String new_str) {_code_string = new_str;}
+
+ /*-----------------------------------------------------------*/
+ /*--- General Methods ---------------------------------------*/
+ /*-----------------------------------------------------------*/
+
+ /** Override to report this object as an action. */
+ public boolean is_action() { return true; }
+
+ /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+ /** Equality comparison for properly typed object. */
+ public boolean equals(action_part other)
+ {
+ /* compare the strings */
+ return other != null && super.equals(other) &&
+ other.code_string().equals(code_string());
+ }
+
+ /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+ /** Generic equality comparison. */
+ public boolean equals(Object other)
+ {
+ if (!(other instanceof action_part))
+ return false;
+ else
+ return equals((action_part)other);
+ }
+
+ /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+ /** Produce a hash code. */
+ public int hashCode()
+ {
+ return super.hashCode() ^
+ (code_string()==null ? 0 : code_string().hashCode());
+ }
+
+ /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
+
+ /** Convert to a string. */
+ public String toString()
+ {
+ return super.toString() + "{" + code_string() + "}";
+ }
+
+ /*-----------------------------------------------------------*/
+}