/* asmif.c */
/*****************************************************************************/
/* AS-Portierung                                                             */
/*                                                                           */
/* Befehle zur bedingten Assemblierung                                       */
/*                                                                           */
/* Historie: 15. 5.1996 Grundsteinlegung                                     */
/*                                                                           */
/*****************************************************************************/

#include "stdinc.h"
#include <string.h>
#include <ctype.h>

#include "bpemu.h"
#include "chunks.h"
#include "strutil.h"
#include "asmdef.h"
#include "asmsub.h"
#include "asmpars.h"

#include "asmif.h"


PIfSave FirstIfSave;
Boolean IfAsm;       /* FALSE: in einer neg. IF-Sequenz-->kein Code */

static Boolean ActiveIF;

        static LongInt GetIfVal(char *Cond)
BEGIN
   Boolean IfOK;
   LongInt Tmp;

   FirstPassUnknown=False;
   Tmp=EvalIntExpression(Cond,Int32,&IfOK);
   if ((FirstPassUnknown) OR (NOT IfOK))
    BEGIN
     Tmp=1;
     if (FirstPassUnknown) WrError(1820);
     else if (NOT IfOK) WrError(1135);
    END

   return Tmp;
END


	static void AddBoolFlag(Boolean Flag)
BEGIN
   strmaxcpy(ListLine,Flag?"=>TRUE":"=>FALSE",255);
END


	static void PushIF(LongInt IfExpr)
BEGIN
   PIfSave NewSave;
   
   NewSave=(PIfSave) malloc(sizeof(TIfSave));
   NewSave->NestLevel=SaveIFs()+1;
   NewSave->Next=FirstIfSave; NewSave->SaveIfAsm=IfAsm;
   NewSave->State=IfState_IFIF; NewSave->CaseFound=(IfExpr!=0);
   FirstIfSave=NewSave;
   IfAsm=(IfAsm AND (IfExpr!=0));
END


	static void CodeIF(void)
BEGIN
   LongInt IfExpr;

   ActiveIF=IfAsm;

   if (NOT IfAsm) IfExpr=1;
   else if (ArgCnt!=1)
    BEGIN
     WrError(1110); IfExpr=1;
    END
   else IfExpr=GetIfVal(ArgStr[1]);
   if (IfAsm) AddBoolFlag(IfExpr!=0);
   PushIF(IfExpr);
END


	static void CodeIFDEF(void)
BEGIN
   LongInt IfExpr;
   Boolean Defined;

   ActiveIF=IfAsm;

   if (NOT IfAsm) IfExpr=1;
   else if (ArgCnt!=1)
    BEGIN
     WrError(1110); IfExpr=1;
    END
   else
    BEGIN
     Defined=IsSymbolDefined(ArgStr[1]);
     if (IfAsm)
      strmaxcpy(ListLine,(Defined)?"=>DEFINED":"=>UNDEFINED",255);
     if (Memo("IFDEF")) IfExpr=(Defined)?1:0;
     else IfExpr=(Defined)?0:1;
    END
   PushIF(IfExpr);
END


	static void CodeIFUSED(void)
BEGIN
   LongInt IfExpr;
   Boolean Used;

   ActiveIF=IfAsm;

   if (NOT IfAsm) IfExpr=1;
   else if (ArgCnt!=1)
    BEGIN
     WrError(1110); IfExpr=1;
    END
   else
    BEGIN
     Used=IsSymbolUsed(ArgStr[1]);
     if (IfAsm)
      strmaxcpy(ListLine,(Used)?"=>USED":"=>UNUSED",255);
     if (Memo("IFUSED")) IfExpr=(Used)?1:0;
     else IfExpr=(Used)?0:1;
    END
   PushIF(IfExpr);
END


	void CodeIFEXIST(void)
BEGIN
   LongInt IfExpr;
   Boolean Found;
   String NPath;

   ActiveIF=IfAsm;

   if (NOT IfAsm) IfExpr=1;
   else if (ArgCnt!=1)
    BEGIN
     WrError(1110); IfExpr=1;
    END
   else
    BEGIN
     strmaxcpy(ArgPart,ArgStr[1],255);
     if (*ArgPart=='"') strcpy(ArgPart,ArgPart+1);
     if (ArgPart[strlen(ArgPart)-1]=='"') ArgPart[strlen(ArgPart)-1]='\0';
     AddSuffix(ArgPart,IncSuffix);
     strmaxcpy(NPath,IncludeList,255); strmaxprep(NPath,".:",255);
     Found=(*(FSearch(ArgPart,NPath))!='\0');
     if (IfAsm)
      strmaxcpy(ListLine,(Found)?"=>FOUND":"=>NOT FOUND",255);
     if (Memo("IFEXIST")) IfExpr=(Found)?1:0;
     else IfExpr=(Found)?0:1;
    END
   PushIF(IfExpr);
END


	static void CodeIFB(void)	
BEGIN
   Boolean Blank=True;
   LongInt IfExpr;
   int z;
   
   ActiveIF=IfAsm;

   if (NOT IfAsm) IfExpr=1;
   else
    BEGIN
     for (z=1; z<=ArgCnt; z++) if (strlen(ArgStr[z++])>0) Blank=False;
     if (IfAsm)
      strmaxcpy(ListLine,(Blank)?"=>BLANK":"=>NOT BLANK",255);
     if (Memo("IFB")) IfExpr=(Blank)?1:0;
     else IfExpr=(Blank)?0:1;
    END
   PushIF(IfExpr); 
END


	static void CodeELSEIF(void)
BEGIN
   LongInt IfExpr;

   if (FirstIfSave==Nil) WrError(1840);
   else if (ArgCnt==0)
    BEGIN
     if (FirstIfSave->State!=IfState_IFIF) WrError(1480);
     else if (FirstIfSave->SaveIfAsm) AddBoolFlag(IfAsm=(NOT FirstIfSave->CaseFound));
     FirstIfSave->State=IfState_IFELSE;
    END
   else if (ArgCnt==1)
    BEGIN
     if (FirstIfSave->State!=IfState_IFIF) WrError(1480);
     else
      BEGIN
       if (NOT FirstIfSave->SaveIfAsm) IfExpr=1;
       else if (FirstIfSave->CaseFound) IfExpr=0;
       else IfExpr=GetIfVal(ArgStr[1]);
       IfAsm=((FirstIfSave->SaveIfAsm) AND (IfExpr!=0) AND (NOT FirstIfSave->CaseFound));
       if (FirstIfSave->SaveIfAsm) AddBoolFlag(IfExpr!=0);
       if (IfExpr!=0) FirstIfSave->CaseFound=True;
      END
    END
   else WrError(1110);

   ActiveIF=(FirstIfSave==Nil) OR (FirstIfSave->SaveIfAsm);
END


	static void CodeENDIF(void)
BEGIN
   PIfSave NewSave;

   if (ArgCnt!=0) WrError(1110);
   if (FirstIfSave==Nil) WrError(1840);
   else
    BEGIN
     if ((FirstIfSave->State!=IfState_IFIF) AND (FirstIfSave->State!=IfState_IFELSE)) WrError(1480);
     else
      BEGIN
       IfAsm=FirstIfSave->SaveIfAsm;
       NewSave=FirstIfSave; FirstIfSave=NewSave->Next;
       free(NewSave);
      END
    END

   ActiveIF=IfAsm;
END


	static void EvalIfExpression(char *Cond, TempResult *erg)
BEGIN
   FirstPassUnknown=False;
   EvalExpression(Cond,erg);
   if ((erg->Typ==TempNone) OR (FirstPassUnknown))
    BEGIN
     erg->Typ=TempInt; erg->Contents.Int=1;
     if (FirstPassUnknown) WrError(1820);
    END
END


	static void CodeSWITCH(void)
BEGIN
   PIfSave NewSave;

   ActiveIF=IfAsm;

   NewSave=(PIfSave) malloc(sizeof(TIfSave));
   NewSave->NestLevel=SaveIFs()+1;
   NewSave->Next=FirstIfSave; NewSave->SaveIfAsm=IfAsm;
   NewSave->CaseFound=False; NewSave->State=IfState_CASESWITCH;
   if (ArgCnt!=1)
    BEGIN
     NewSave->SaveExpr.Typ=TempInt; 
     NewSave->SaveExpr.Contents.Int=1; 
     if (IfAsm) WrError(1110);
    END
   else
    BEGIN
     EvalIfExpression(ArgStr[1],&(NewSave->SaveExpr));
     SetListLineVal(&(NewSave->SaveExpr));
    END
   FirstIfSave=NewSave;
END


	static void CodeCASE(void)
BEGIN
   Boolean eq;
   int z;
   TempResult t;

   if (FirstIfSave==Nil) WrError(1840);
   else if (ArgCnt==0) WrError(1110);
   else 
    BEGIN
     if ((FirstIfSave->State!=IfState_CASESWITCH) AND (FirstIfSave->State!=IfState_CASECASE)) WrError(1480);
     else
      BEGIN
       if (NOT FirstIfSave->SaveIfAsm) eq=True;
       else if (FirstIfSave->CaseFound) eq=False;
       else
	BEGIN
	 eq=False; z=1;
	 do
          BEGIN
	   EvalIfExpression(ArgStr[z],&t);
           eq=(FirstIfSave->SaveExpr.Typ==t.Typ);
	   if (eq)
	    switch (t.Typ)
             BEGIN
	      case TempInt:    eq=(t.Contents.Int==FirstIfSave->SaveExpr.Contents.Int); break;
	      case TempFloat:  eq=(t.Contents.Float==FirstIfSave->SaveExpr.Contents.Float); break;
	      case TempString: eq=(strcmp(t.Contents.Ascii,FirstIfSave->SaveExpr.Contents.Ascii)==0); break;
              case TempNone:   eq=False; break;
	     END
	   z++;
          END
	 while ((NOT eq) AND (z<=ArgCnt));
	END;
       IfAsm=((FirstIfSave->SaveIfAsm) AND (eq) AND (NOT FirstIfSave->CaseFound));
       if (FirstIfSave->SaveIfAsm) AddBoolFlag(eq AND (NOT FirstIfSave->CaseFound));
       if (eq) FirstIfSave->CaseFound=True;
       FirstIfSave->State=IfState_CASECASE;
      END
    END

   ActiveIF=(FirstIfSave==Nil) OR (FirstIfSave->SaveIfAsm);
END


	static void CodeELSECASE(void)
BEGIN
   if (ArgCnt!=0) WrError(1110);
   else
    BEGIN
     if ((FirstIfSave->State!=IfState_CASESWITCH) AND (FirstIfSave->State!=IfState_CASECASE)) WrError(1480);
     else IfAsm=(FirstIfSave->SaveIfAsm AND (NOT FirstIfSave->CaseFound));
     if (FirstIfSave->SaveIfAsm) AddBoolFlag(NOT FirstIfSave->CaseFound);
     FirstIfSave->CaseFound=True;
     FirstIfSave->State=IfState_CASEELSE;
    END

   ActiveIF=(FirstIfSave==Nil) OR (FirstIfSave->SaveIfAsm);
END


	static void CodeENDCASE(void)
BEGIN
   PIfSave NewSave;

   if (ArgCnt!=0) WrError(1110);
   if (FirstIfSave==Nil) WrError(1840);
   else 
    BEGIN
     if ((FirstIfSave->State!=IfState_CASESWITCH) 
     AND (FirstIfSave->State!=IfState_CASECASE) 
     AND (FirstIfSave->State!=IfState_CASEELSE)) WrError(1480);
     else
      BEGIN
       IfAsm=FirstIfSave->SaveIfAsm;
       if (NOT FirstIfSave->CaseFound) WrError(100);
       NewSave=FirstIfSave; FirstIfSave=NewSave->Next;
       free(NewSave);
      END
    END

   ActiveIF=IfAsm;
END


	Boolean CodeIFs(void)
BEGIN
   Boolean Result=True;

   ActiveIF=False;

   switch (toupper(*OpPart))
    BEGIN
     case 'I':
      if (Memo("IF")) CodeIF();
      else if ((Memo("IFDEF")) OR (Memo("IFNDEF"))) CodeIFDEF();
      else if ((Memo("IFUSED")) OR (Memo("IFNUSED"))) CodeIFUSED();
      else if ((Memo("IFEXIST")) OR (Memo("IFNEXIST"))) CodeIFEXIST();
      else if ((Memo("IFB")) OR (Memo("IFNB"))) CodeIFB();
      else Result=False;
      break;
     case 'E':
      if ((Memo("ELSE")) OR (Memo("ELSEIF"))) CodeELSEIF();
      else if (Memo("ENDIF")) CodeENDIF();
      else if (Memo("ELSECASE")) CodeELSECASE();
      else if (Memo("ENDCASE")) CodeENDCASE();
      else Result=False;
      break;
     case 'S':
      if (Memo("SWITCH")) CodeSWITCH();
      else Result=False;
      break;
     case 'C':
      if (Memo("CASE")) CodeCASE();
      else Result=False;
      break;
     default:
      Result=False;
    END

   return Result;
END

	Integer SaveIFs(void)
BEGIN
   return (FirstIfSave==Nil) ? 0 : FirstIfSave->NestLevel;
END

	void RestoreIFs(Integer Level)
BEGIN
   PIfSave OldSave;

   while ((FirstIfSave!=Nil) AND (FirstIfSave->NestLevel!=Level))
    BEGIN
     OldSave=FirstIfSave; FirstIfSave=OldSave->Next;
     IfAsm=OldSave->SaveIfAsm;
     free(OldSave);
    END
END


	Boolean IFListMask(void)
BEGIN
   switch (ListOn)
    BEGIN
     case 0: return True;
     case 1: return False;
     case 2: return ((NOT ActiveIF) AND (NOT IfAsm));
     case 3: return (ActiveIF OR (NOT IfAsm));
    END
   return True;
END


	void AsmIFInit(void)
BEGIN
   IfAsm=True;
END


	void asmif_init(void)
BEGIN
END