action_production.java

package java_cup ;


/**
 * A specialized version of a production used when we split an existing
 * production in order to remove an embedded action. Here we keep a bit of extra
 * bookkeeping so that we know where we came from.
 * 
 * @version last updated: 11/25/95
 * @author Scott Hudson
 */
public class action_production extends production
{
  /**
   * Constructor.
   * 
   * @param base the production we are being factored out of.
   * @param lhs_sym the LHS symbol for this production.
   * @param rhs_parts array of production parts for the RHS.
   * @param rhs_len how much of the rhs_parts array is valid.
   * @param action_str the trailing reduce action for this production.
   * @param indexOfIntermediateResult the index of the result of the previous
   *          intermediate action on the stack relative to top, -1 if no
   *          previous action
   */
  public action_production ( production base , non_terminal lhs_sym ,
      production_part rhs_parts[] , int rhs_len , String action_str ,
      int indexOfIntermediateResult ) throws internal_error
  {
    super ( lhs_sym , rhs_parts , rhs_len , action_str ) ;
    _base_production = base ;
    this.indexOfIntermediateResult = indexOfIntermediateResult ;
  }


  private int indexOfIntermediateResult ;


  /**
   * @return the index of the result of the previous intermediate action on the
   *         stack relative to top, -1 if no previous action
   */
  public int getIndexOfIntermediateResult ( )
  {
    return indexOfIntermediateResult ;
  }


  /* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . */
  /** The production we were taken out of. */
  protected production _base_production ;


  /** The production we were taken out of. */
  public production base_production ( )
  {
    return _base_production ;
  }
}