QueueInstruction.cpp

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/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
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/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive Queue Parse Class                                                */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "StringClass.hpp"
#include "RexxActivation.hpp"
#include "RexxActivity.hpp"
#include "QueueInstruction.hpp"
 
RexxInstructionQueue::RexxInstructionQueue(
  RexxObject *_expression,              /* expresion to evaluate             */
  int type)                            /* top of queueing operation         */
/******************************************************************************/
/* Function:   Initialize a QUEUE instruction object                          */
/******************************************************************************/
{
    /* process the expression            */
    OrefSet(this, this->expression, _expression);
    if (type == QUEUE_LIFO)
    {
        instructionFlags |= queue_lifo;
    }
}
 
void RexxInstructionQueue::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack )       /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX QUEUE or PUSH instruction                      */
/****************************************************************************/
{
    RexxObject *result;                  /* expression result                 */
    RexxString *value;                   /* output value                      */
 
    ProtectedObject p_value;
    
    context->traceInstruction(this);     /* trace if necessary                */
    if (this->expression != OREF_NULL) /* have an expression value?         */
    {
        /* get the expression value          */
        result = this->expression->evaluate(context, stack);
        value = REQUEST_STRING(result);    /* get the string version            */
        p_value = value;
    }
    else
    {
        value =  OREF_NULLSTRING;          /* use a NULL string                 */
    }
    context->traceResult(value);         /* trace if necessary                */
                                         /* write out the line                */
    ActivityManager::currentActivity->queue(context, value, ((instructionFlags&queue_lifo) != 0) ? QUEUE_LIFO : QUEUE_FIFO);
    context->pauseInstruction();         /* do debug pause if necessary       */
}