CommandInstruction.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 Command Parse Class                                              */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "RexxActivation.hpp"
#include "CommandInstruction.hpp"
 
 
RexxInstructionCommand::RexxInstructionCommand(
    RexxObject *_expression)            /* command expression                */
/******************************************************************************/
/* Function:  Complete initialzation a command instruction object             */
/******************************************************************************/
{
                                       /* save the command expression       */
  OrefSet(this, this->expression, _expression);
}
 
void RexxInstructionCommand::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack )       /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX command instruction                            */
/****************************************************************************/
{
    context->traceCommand(this);         /* trace if necessary                */
                                         /* get the expression value          */
    RexxObject *result = this->expression->evaluate(context, stack);
    if (context->enableCommands())
    {
        RexxString *command = REQUEST_STRING(result);    /* force to string form              */
        /* are we tracing commands?          */
        if (context->tracingCommands())
        {
            /* then we always trace full command */
            context->traceValue((RexxObject *)command, TRACE_PREFIX_RESULT);
        }
        /* go process the command            */
        context->command(context->getAddress(), command);
    }
    else
    {
        if (result != OREF_NULL)   /* result returned?                  */
        {
            /* set the RESULT variable to the    */
            /* message return value              */
            context->setLocalVariable(OREF_RESULT, VARIABLE_RESULT, (RexxObject *)result);
            context->traceResult((RexxObject *)result);  /* trace if necessary                */
        }
        else                               /* drop the variable RESULT          */
        {
            context->dropLocalVariable(OREF_RESULT, VARIABLE_RESULT);
        }
    }
}