ParseInstruction.cpp

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/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2009 Rexx Language Association. All rights reserved.    */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Translator                                                            */
/*                                                                            */
/* Primitive Parse Parse Class                                                */
/*                                                                            */
/******************************************************************************/
#include <stdlib.h>
#include "RexxCore.h"
#include "StringClass.hpp"
#include "QueueClass.hpp"
#include "DirectoryClass.hpp"
#include "RexxActivation.hpp"
#include "RexxActivity.hpp"
#include "ParseInstruction.hpp"
#include "ParseTrigger.hpp"
#include "ParseTarget.hpp"
#include "Token.hpp"
#include "Interpreter.hpp"
 
 
RexxInstructionParse::RexxInstructionParse(
  RexxObject *_expression,             /* string expression source          */
  unsigned short string_source,        /* source of the parsed string       */
  size_t      flags,                   /* option flags                      */
  size_t      templateCount,           /* count of template items           */
  RexxQueue  *parse_template )         /* parsing template array            */
/******************************************************************************/
/* Function:  Complete parse instruction initialization                       */
/******************************************************************************/
{
    /* save the expression               */
    OrefSet(this, this->expression, _expression);
    instructionFlags = (uint16_t)flags;  /* save the expression               */
    stringSource = string_source;        // our instruction type is determined by the source
    this->trigger_count = templateCount; /* save the size                     */
    while (templateCount > 0)            /* loop through the template list    */
    {
                                         /* copying each trigger              */
        OrefSet(this, this->triggers[--templateCount], (RexxTrigger *)parse_template->pop());
    }
}
 
void RexxInstructionParse::execute(
    RexxActivation      *context,      /* current activation context        */
    RexxExpressionStack *stack )       /* evaluation stack                  */
/****************************************************************************/
/* Function:  Execute a REXX PARSE instruction                              */
/****************************************************************************/
{
    RexxObject       *value;             /* parsed value                      */
    RexxObject      **argList;           /* current argument list             */
    size_t            argCount;          /* the argument list size            */
    RexxTarget        target;            /* created target value              */
    RexxTrigger      *trigger;           /* current trigger                   */
    size_t            size;              /* size of template array            */
    bool              multiple;          /* processing an argument list       */
    size_t            i;                 /* loop counter                      */
 
    context->traceInstruction(this);     /* trace if necessary                */
    multiple = false;                    /* default to no argument list       */
    value = OREF_NULLSTRING;             /* no value yet                      */
    argList = OREF_NULL;                 /* neither is there an argument list */
    argCount = 0;
 
    switch (stringSource)              /* get data from variaous sources    */
    {
 
        case SUBKEY_PULL:                  /* PARSE PULL instruction            */
            /* read a line from the queue        */
            value = ActivityManager::currentActivity->pullInput(context);
            stack->push(value);              /* add the value to the stack        */
            break;
 
        case SUBKEY_LINEIN:                /* PARSE LINEIN instruction          */
            /* read a line from the stream       */
            value = ActivityManager::currentActivity->lineIn(context);
            stack->push(value);              /* add the value to the stack        */
            break;
 
        case SUBKEY_ARG:                   /* PARSE ARG instruction             */
            multiple = true;                 /* have an argument list             */
            /* get the current argument list     */
            argList = context->getMethodArgumentList();
            argCount = context->getMethodArgumentCount();
            break;
 
        case SUBKEY_SOURCE:                /* PARSE SOURCE instruction          */
            value = context->sourceString(); /* retrieve the source string        */
            stack->push(value);              /* add the value to the stack        */
            break;
 
        case SUBKEY_VERSION:               /* PARSE VERSION instruction         */
            /* retrieve the version string       */
            value = Interpreter::getVersionNumber();
            break;
 
        case SUBKEY_VAR:                   /* PARSE VAR name instruction        */
            /* get the variable value            */
            value = this->expression->evaluate(context, stack);
            stack->push(value);              /* add the value to the stack        */
            break;
 
        case SUBKEY_VALUE:                 /* PARSE VALUE expr WITH instruction */
            /* have an expression?               */
            if (this->expression != OREF_NULL)
            {
                /* get the expression value          */
                value = this->expression->evaluate(context, stack);
            }
            else
            {
                value = OREF_NULLSTRING;       /* must have been "parse value with" */
            }
            stack->push(value);              /* add the value to the stack        */
            break;
    }
    /* create the parse target           */
    target.init(value, argList, argCount, instructionFlags&parse_translate, multiple, context, stack);
 
    size = this->trigger_count;          /* get the template size             */
    for (i = 0; i < size; i++)         /* loop through the template list    */
    {
        trigger = this->triggers[i];       /* get the next trigger value        */
        if (trigger == OREF_NULL)          /* end of this template portion?     */
        {
            target.next(context);            /* reset for the next string         */
        }
        else                               /* process this trigger              */
        {
            trigger->parse(context, stack, &target);
        }
    }
    context->pauseInstruction();         /* do debug pause if necessary       */
}
 
void RexxInstructionParse::live(size_t liveMark)
/******************************************************************************/
/* Function:  Normal garbage collection live marking                          */
/******************************************************************************/
{
    size_t  i;                           /* loop counter                      */
    size_t  count;                       /* argument count                    */
 
    memory_mark(this->nextInstruction);  /* must be first one marked          */
    for (i = 0, count = this->trigger_count; i < count; i++)
    {
        memory_mark(this->triggers[i]);
    }
    memory_mark(this->expression);
}
 
void RexxInstructionParse::liveGeneral(int reason)
/******************************************************************************/
/* Function:  Generalized object marking                                      */
/******************************************************************************/
{
    size_t  i;                           /* loop counter                      */
    size_t  count;                       /* argument count                    */
 
                                         /* must be first one marked          */
    memory_mark_general(this->nextInstruction);
    for (i = 0, count = this->trigger_count; i < count; i++)
    {
        memory_mark_general(this->triggers[i]);
    }
    memory_mark_general(this->expression);
}
 
void RexxInstructionParse::flatten(RexxEnvelope *envelope)
/******************************************************************************/
/* Function:  Flatten an object                                               */
/******************************************************************************/
{
    size_t  i;                           /* loop counter                      */
    size_t  count;                       /* argument count                    */
 
    setUpFlatten(RexxInstructionParse)
 
    flatten_reference(newThis->nextInstruction, envelope);
    for (i = 0, count = this->trigger_count; i < count; i++)
    {
        flatten_reference(newThis->triggers[i], envelope);
    }
    flatten_reference(newThis->expression, envelope);
    cleanUpFlatten
}