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CGDecision.cpp
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CGDecision.cpp
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/****************************************************************************
* Modul: $RCSfile: CGDecision.cpp,v $
*
* $Author: hirche $
* $Date: 1997/08/29 13:35:30 $
* $Revision: 1.1 $
*
* Aufgabe: Dieses Modul enthaelt die Generierung des C++-Codes fuer
* entsprechende SDL-Aktionen
****************************************************************************/
#ifdef USE_PRAGMA
#pragma interface
#endif
/****************************************************************************
* Konstanten
****************************************************************************/
/****************************************************************************
* Include-Anweisungen
****************************************************************************/
#include <DS/DSString.h>
#include <DS/DSRange.h>
#include <DS/DSOperand.h>
#include "CGFile.h"
#include "CGDecision.h"
#include "CGExpression.h"
#include "CGTransition.h"
#ifdef DEBUG
#include <dmalloc.h>
#endif
/****************************************************************************
* Externe Variablen
****************************************************************************/
/****************************************************************************
* Globale Variablen
****************************************************************************/
/****************************************************************************
* Konstruktoren
****************************************************************************/
CGDecision::CGDecision(DSObject *father,
DSString *label_name,
DSExpression *quest,
DSRangeList *answers,
DSTransitionList *transitions,
DSTransition *else_t) :
DSDecision(father, label_name, quest, answers, transitions, else_t)
{
}
CGDecision::CGDecision(DSObject *father,
DSString &label_name,
DSExpression *quest,
DSRangeList *answers,
DSTransitionList *transitions,
DSTransition *else_t) :
DSDecision(father, label_name, quest, answers, transitions, else_t)
{
}
CGDecision::CGDecision(DSObject *father,
const char *label_name,
DSExpression *quest,
DSRangeList *answers,
DSTransitionList *transitions,
DSTransition *else_t) :
DSDecision(father, label_name, quest, answers, transitions, else_t)
{
}
/****************************************************************************
* Destruktor
****************************************************************************/
CGDecision::~CGDecision(void)
{
}
/****************************************************************************
* Virtueller Konstruktor
****************************************************************************/
DSObject *CGDecision::New(DSObject *father) const
{
return (DSDecision *)new CGDecision(father);
}
/****************************************************************************
* WriteCondition(): schreibt eine Bedingung eines Decision
* Ergebnis: DS_OK,falls Aktion erfolgreich war, sonst
* -> writer
* -> question: Bedingung
* -> answer: SDL-Range (offen oder geschlossen)
* Ergebnis: DS_OK,falls Aktion erfolgreich war, sonst
* DS_ERROR
* Seiteneffekte: Zieldatei wird gefuellt
****************************************************************************/
DSResult CGDecision::WriteCondition(CGWriter *writer,
DSExpression *quest,
DSRange *answer) const
{
DSResult result;
CGFile *out;
CGPos pos;
out = writer->CGGetFilePointer();
pos = writer->CGGetIndentPos();
result = quest->Write(writer);
if (result != DS_OK) return result;
switch (answer->GetRangeOperator())
{
case DS_RANGE_OPT_NONE:
if (answer->GetLowerBound()) // Intervall ?
{
InsertString(*out, " >= ", 0, CG_NO_EOL);
writer->CGSetIndentPos(0);
result = answer->GetLowerBound()->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, " && ", 0, CG_NO_EOL);
writer->CGSetIndentPos(0);
result = quest->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, " <= ", 0, CG_NO_EOL);
}
else
{
InsertString(*out, " == ", 0, CG_NO_EOL);
}
break;
case DS_RANGE_OPT_EQUAL:
InsertString(*out, " == ", 0, CG_NO_EOL);
break;
case DS_RANGE_OPT_NOT_EQUAL:
InsertString(*out, " != ", 0, CG_NO_EOL);
break;
case DS_RANGE_OPT_GREATER:
InsertString(*out, " > ", 0, CG_NO_EOL);
break;
case DS_RANGE_OPT_GREATER_EQUAL:
InsertString(*out, " >= ", 0, CG_NO_EOL);
break;
case DS_RANGE_OPT_LESS:
InsertString(*out, " < ", 0, CG_NO_EOL);
break;
case DS_RANGE_OPT_LESS_EQUAL:
InsertString(*out, " <= ", 0, CG_NO_EOL);
break;
default:
assert(DS_FALSE);
} // switch Range-Operator
writer->CGSetIndentPos(0);
assert(answer->GetUpperBound());
result = answer->GetUpperBound()->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
return DS_OK;
}
/****************************************************************************
* WriteIf(): schreibt eine SDL-Decison als C-if
* -> writer
* Ergebnis: DS_OK,falls Aktion erfolgreich war, sonst DS_ERROR
* Seiteneffekte: Zieldatei wird gefuellt
****************************************************************************/
DSResult CGDecision::WriteIf(CGWriter *writer) const
{
DSResult result;
DSExpression *quest;
DSRange *answer;
DSTransition *transition;
CGFile *out;
CGPos pos;
out = writer->CGGetFilePointer();
pos = writer->CGGetIndentPos();
quest = GetQuestion();
assert(quest);
answer = GetFirstAnswer();
assert(answer);
transition = GetFirstTransition();
assert(transition);
InsertString(*out, "if (", pos, CG_NO_EOL);
writer->CGSetIndentPos(0);
result = WriteCondition(writer, quest, answer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, ")", 0, CG_WITH_EOL);
InsertString(*out, "{", pos, CG_WITH_EOL);
writer->CGSetIndentPos(pos + 2);
result = transition->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, "}", pos, CG_WITH_EOL);
transition = GetElseTransition();
if (transition)
{
InsertString(*out, "else", pos, CG_WITH_EOL);
InsertString(*out, "{", pos, CG_WITH_EOL);
writer->CGSetIndentPos(pos + 2);
result = transition->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, "}", pos, CG_WITH_EOL);
}
return DS_OK;
}
/****************************************************************************
* WriteSwitch(): schreibt eine SDL-Decison als C-switch
* -> writer
* Ergebnis: DS_OK,falls Aktion erfolgreich war, sonst
* DS_ERROR
* Seiteneffekte: Zieldatei wird gefuellt
****************************************************************************/
DSResult CGDecision::WriteSwitch(CGWriter *writer) const
{
DSResult result;
DSExpression *quest;
DSRange *answer;
DSTransition *transition;
CGFile *out;
CGPos pos;
out = writer->CGGetFilePointer();
pos = writer->CGGetIndentPos();
quest = GetQuestion();
assert(quest);
InsertString(*out, "switch (", pos, CG_NO_EOL);
writer->CGSetIndentPos(0);
result = quest->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, ")", 0, CG_WITH_EOL);
InsertString(*out, "{", pos, CG_WITH_EOL);
for (answer = GetFirstAnswer(),
transition = GetFirstTransition();
answer && transition;
answer = GetNextAnswer(),
transition = GetNextTransition())
{
InsertString(*out, "case ", pos + 2, CG_NO_EOL);
writer->CGSetIndentPos(0);
result = answer->GetUpperBound()->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, ":", 0, CG_WITH_EOL);
writer->CGSetIndentPos(pos + 4);
result = transition->Write(writer);
writer->CGSetIndentPos(pos);
if (result != DS_OK) return result;
InsertString(*out, "break;", pos + 4, CG_WITH_EOL);
}
transition = GetElseTransition();
if (transition)
{
InsertString(*out, "default:", pos + 2, CG_WITH_EOL);
writer->CGSetIndentPos(pos + 4);
result = transition->Write(writer);
if (result != DS_OK) return result;
writer->CGSetIndentPos(pos);
InsertString(*out, "break;", pos + 4, CG_WITH_EOL);
}
InsertString(*out, "}", pos, CG_WITH_EOL);
return DS_OK;
}
/****************************************************************************
* Write(): Hauptfunktion der Codegenerierung fuer ein Decision-Konstrukt
* -> writer
* -> what
* Ergebnis: DS_OK,falls Aktion erfolgreich war, sonst DS_ERROR
* Seiteneffekte: Zieldatei wird gefuellt
****************************************************************************/
DSResult CGDecision::Write(DSWriter *writer, DSCardinal what) const
{
DSResult result;
DSExpression *quest;
DSRange *answer;
DSOperand *operand;
DSExpression *expression;
DSTransition *transition;
DSBoolean use_switch, is_any;
DSCardinal i, num_of_answers, num_of_transitions;
DSString str;
CGFile *out;
CGPos pos;
(void)what;
out = ((CGWriter *)writer)->CGGetFilePointer();
pos = ((CGWriter *)writer)->CGGetIndentPos();
result = WriteLabel((CGWriter *)writer);
if (result != DS_OK) return result;
quest = GetQuestion();
if (quest == NULL) // Decison ANY ?
{
is_any = DS_TRUE;
}
else
{
is_any = DS_FALSE;
}
if (!is_any)
{
num_of_answers = GetAnswerList()->NumberOfElements();
}
else // Decision ANY !
{
num_of_answers = 0;
}
num_of_transitions = GetTransitionList()->NumberOfElements();
if (!is_any && num_of_answers == 1)
{
return WriteIf((CGWriter *)writer);
}
use_switch = DS_TRUE;
for (answer = GetFirstAnswer();
answer;
answer = GetNextAnswer())
{
// Nicht nur UpperBound sondern auch LowerBound
// gesetzt oder Offener Range-Bereich?
if (answer->GetLowerBound() != NULL ||
answer->GetRangeOperator() != DS_RANGE_OPT_NONE)
{
use_switch = DS_FALSE;
break;
}
// Ist der UpperBound 'nicht-trivial', d.h.
// ein zusammengesetzter Ausdruck?
expression = answer->GetUpperBound();
if (expression->GetOperand2() != NULL)
{
use_switch = DS_FALSE;
break;
}
// Ausdruck ist nicht zusammengesetzt, aber
// vielleicht 'nicht konstant' ?
operand = expression->GetOperand1();
if (operand->GetTag() != DS_OPN_CONSTANT &&
operand->GetTag() != DS_OPN_LITERAL)
{
use_switch = DS_FALSE;
break;
}
}
if (!is_any && use_switch)
{
return WriteSwitch((CGWriter *)writer);
}
// Die SDL-Decision muss in eine SCL-Decision umgewandelt werden:
str.Format("switch (Decision(%d, ", num_of_transitions);
InsertString(*out, str, pos, CG_NO_EOL);
if (!is_any)
{
i = 1;
for (answer = GetFirstAnswer();
answer;
answer = GetNextAnswer())
{
((CGWriter *)writer)->CGSetIndentPos(0);
result = WriteCondition((CGWriter *)writer, quest, answer);
((CGWriter *)writer)->CGSetIndentPos(pos);
if (result != DS_OK) return result;
if (i < num_of_answers)
{
InsertString(*out, ", ", 0, CG_NO_EOL);
}
i++;
}
}
else // Decison ANY !
{
for (i = 1;
i <= num_of_transitions;
i++)
{
InsertString(*out, "true", 0, CG_NO_EOL);
if (i < num_of_transitions)
{
InsertString(*out, ", ", 0, CG_NO_EOL);
}
}
}
InsertString(*out, "))", 0, CG_WITH_EOL);
InsertString(*out, "{", pos, CG_WITH_EOL);
i = 0;
for (transition = GetFirstTransition();
transition;
transition = GetNextTransition())
{
str.Format("case kSCDecisionBase + %d:", i);
InsertString(*out, str, pos + 2, CG_WITH_EOL);
((CGWriter *)writer)->CGSetIndentPos(pos + 4);
result = transition->Write(writer);
if (result != DS_OK) return result;
((CGWriter *)writer)->CGSetIndentPos(pos);
InsertString(*out, "break;", pos + 4, CG_WITH_EOL);
i++;
}
InsertString(*out, "default:", pos + 2, CG_WITH_EOL);
transition = GetElseTransition();
if (transition)
{
((CGWriter *)writer)->CGSetIndentPos(pos + 4);
result = transition->Write(writer);
if (result != DS_OK) return result;
((CGWriter *)writer)->CGSetIndentPos(pos);
}
else
{
InsertString(*out, "std::cerr << \"Not specified decision value!\" << std::endl;",
pos + 4, CG_WITH_EOL);
}
InsertString(*out, "break;", pos + 4, CG_WITH_EOL);
InsertString(*out, "}", pos, CG_WITH_EOL);
return DS_OK;
}
/****************************************************************************
* WriteLabel(): Schreibt das optionale Label der SDL-Aktion
* -> writer
* Ergebnis: DS_OK, falls Aktion erfolgreich war, sonst
* enthaelt DSResult das Ergebnis
* Seiteneffekte: Zieldatei wird gefuellt
****************************************************************************/
DSResult CGDecision::WriteLabel(CGWriter *writer) const
{
DSResult result;
DSStringKeyList *label_list;
DSString *new_label;
CGFile *out;
CGPos pos;
if (GetLabel() == NULL) return DS_OK;
out = writer->CGGetFilePointer();
assert(out);
pos = writer->CGGetIndentPos();
label_list = writer->CGGetLabelList();
if (label_list == NULL || // kann innerhalb einer Starttransition passieren
!label_list->IsKeyInList(GetLabel()))
{
InsertString(*out, PREFIX_LABEL, pos, CG_NO_EOL);
InsertString(*out, GetLabel(), 0, CG_NO_EOL);
InsertString(*out, ":", 0, CG_WITH_EOL);
if (label_list != NULL)
{
new_label = new DSString(*GetLabel());
assert(new_label);
assert(label_list->Append(new DSString(*new_label), new_label) == DS_OK);
}
}
return DS_OK;
}