+++ /dev/null
-package java_cup;
-
-/** This class represents a part of a production which is a symbol (terminal
- * or non terminal). This simply maintains a reference to the symbol in
- * question.
- *
- * @see java_cup.production
- * @version last updated: 11/25/95
- * @author Scott Hudson
- */
-public class symbol_part extends production_part {
-
- /*-----------------------------------------------------------*/
- /*--- Constructor(s) ----------------------------------------*/
- /*-----------------------------------------------------------*/
-
- /** Full constructor.
- * @param sym the symbol that this part is made up of.
- * @param lab an optional label string for the part.
- */
- public symbol_part(symbol sym, String lab) throws internal_error
- {
- super(lab);
-
- if (sym == null)
- throw new internal_error(
- "Attempt to construct a symbol_part with a null symbol");
- _the_symbol = sym;
- }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Constructor with no label.
- * @param sym the symbol that this part is made up of.
- */
- public symbol_part(symbol sym) throws internal_error
- {
- this(sym,null);
- }
-
- /*-----------------------------------------------------------*/
- /*--- (Access to) Instance Variables ------------------------*/
- /*-----------------------------------------------------------*/
-
- /** The symbol that this part is made up of. */
- protected symbol _the_symbol;
-
- /** The symbol that this part is made up of. */
- public symbol the_symbol() {return _the_symbol;}
-
- /*-----------------------------------------------------------*/
- /*--- General Methods ---------------------------------------*/
- /*-----------------------------------------------------------*/
-
- /** Respond that we are not an action part. */
- public boolean is_action() { return false; }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Equality comparison. */
- public boolean equals(symbol_part other)
- {
- return other != null && super.equals(other) &&
- the_symbol().equals(other.the_symbol());
- }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Generic equality comparison. */
- public boolean equals(Object other)
- {
- if (!(other instanceof symbol_part))
- return false;
- else
- return equals((symbol_part)other);
- }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Produce a hash code. */
- public int hashCode()
- {
- return super.hashCode() ^
- (the_symbol()==null ? 0 : the_symbol().hashCode());
- }
-
- /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
-
- /** Convert to a string. */
- public String toString()
- {
- if (the_symbol() != null)
- return super.toString() + the_symbol();
- else
- return super.toString() + "$$MISSING-SYMBOL$$";
- }
-
- /*-----------------------------------------------------------*/
-
-}