/*
 * $Id$
 */

/*
 * Harbour Project source code:
 * Header file for the Harbour Compiler
 *
 * Copyright 1999 Ryszard Glab
 * www - http://www.harbour-project.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
 *
 * As a special exception, the Harbour Project gives permission for
 * additional uses of the text contained in its release of Harbour.
 *
 * The exception is that, if you link the Harbour libraries with other
 * files to produce an executable, this does not by itself cause the
 * resulting executable to be covered by the GNU General Public License.
 * Your use of that executable is in no way restricted on account of
 * linking the Harbour library code into it.
 *
 * This exception does not however invalidate any other reasons why
 * the executable file might be covered by the GNU General Public License.
 *
 * This exception applies only to the code released by the Harbour
 * Project under the name Harbour.  If you copy code from other
 * Harbour Project or Free Software Foundation releases into a copy of
 * Harbour, as the General Public License permits, the exception does
 * not apply to the code that you add in this way.  To avoid misleading
 * anyone as to the status of such modified files, you must delete
 * this exception notice from them.
 *
 * If you write modifications of your own for Harbour, it is your choice
 * whether to permit this exception to apply to your modifications.
 * If you do not wish that, delete this exception notice.
 *
 */

#ifndef HB_EXPROP_H_
#define HB_EXPROP_H_

#include "hbapi.h"

HB_EXTERN_BEGIN

/* value types seen at language level
 */
#define  HB_EV_UNKNOWN     0
#define  HB_EV_NIL         1
#define  HB_EV_NUMERIC     2
#define  HB_EV_STRING      4
#define  HB_EV_CODEBLOCK   8
#define  HB_EV_LOGICAL     16
#define  HB_EV_OBJECT      32
#define  HB_EV_ARRAY       64
#define  HB_EV_SYMBOL      128
#define  HB_EV_VARREF      256
#define  HB_EV_FUNREF      512
#define  HB_EV_DATE        1024

/* messages sent to expressions
 */
typedef enum
{
   HB_EA_REDUCE = 0,    /* reduce the expression into optimized one */
   HB_EA_ARRAY_AT,      /* check if the expession can be used as array */
   HB_EA_ARRAY_INDEX,   /* check if the expession can be used as index */
   HB_EA_LVALUE,        /* check if the expression can be used as lvalue (left side of an assigment) */
   HB_EA_PUSH_PCODE,    /* generate the pcodes to push the value of expression */
   HB_EA_POP_PCODE,     /* generate the pcodes to pop the value of expression */
   HB_EA_PUSH_POP,      /* generate the pcodes to push and pop the expression */
   HB_EA_STATEMENT,     /* generate the pcodes for a statement */
   HB_EA_DELETE         /* delete components of the expression */
} HB_EXPR_MESSAGE;

/* additional definitions used to distinguish numeric expressions
 */
#define  HB_ET_LONG     1
#define  HB_ET_DOUBLE   2

/* additional definitions used to distinguish macro expressions
 */
#define  HB_ET_MACRO_VAR      0   /* &variable */
#define  HB_ET_MACRO_SYMBOL   1   /* &fimcall() */
#define  HB_ET_MACRO_ALIASED  2   /* &alias->&variable */
#define  HB_ET_MACRO_EXPR     4   /* &( expr ) */
#define  HB_ET_MACRO_ARGLIST  8   /* &variable used as a function call argument */
#define  HB_ET_MACRO_LIST    16   /* &variable used as in literal arrays or parentesised expressions. */
#define  HB_ET_MACRO_INDEX   32   /* &variable used as arrays index. */
#define  HB_ET_MACRO_PARE    64   /* &variable used as arrays index. */
#define  HB_ET_MACRO_REFER  128   /* &macro used in @ (pass by reference) */

/* types of expressions
 * NOTE: the order of these definition is important - change it carefully
 *    All types <= HB_ET_FUNREF are constant values
 *    All types <= HB_ET_VARIABLE are a simple values
 *    All types > HB_ET_VARIABLE are operators
 */
typedef enum
{
   HB_ET_NONE = 0,
   HB_ET_NIL,
   HB_ET_NUMERIC,
   HB_ET_DATE,
   HB_ET_STRING,
   HB_ET_CODEBLOCK,
   HB_ET_LOGICAL,
   HB_ET_SELF,
   HB_ET_ARRAY,
   HB_ET_VARREF,
   HB_ET_REFERENCE,
   HB_ET_FUNREF,
   HB_ET_IIF,
   HB_ET_LIST,
   HB_ET_ARGLIST,
   HB_ET_ARRAYAT,
   HB_ET_MACRO,
   HB_ET_FUNCALL,
   HB_ET_ALIASVAR,
   HB_ET_ALIASEXPR,
   HB_ET_SEND,
   HB_ET_FUNNAME,
   HB_ET_ALIAS,
   HB_ET_RTVAR,      /* PRIVATE or PUBLIC declaration of variable */
   HB_ET_VARIABLE,
   HB_EO_POSTINC,    /* post-operators -> lowest precedence */
   HB_EO_POSTDEC,
   HB_EO_ASSIGN,     /* assigments */
   HB_EO_PLUSEQ,
   HB_EO_MINUSEQ,
   HB_EO_MULTEQ,
   HB_EO_DIVEQ,
   HB_EO_MODEQ,
   HB_EO_EXPEQ,
   HB_EO_OR,         /* logical operators */
   HB_EO_AND,
   HB_EO_NOT,
   HB_EO_EQUAL,      /* relational operators */
   HB_EO_EQ,
   HB_EO_LT,
   HB_EO_GT,
   HB_EO_LE,
   HB_EO_GE,
   HB_EO_NE,
   HB_EO_IN,
   HB_EO_PLUS,       /* addition */
   HB_EO_MINUS,
   HB_EO_MULT,       /* multiple */
   HB_EO_DIV,
   HB_EO_MOD,
   HB_EO_POWER,
   HB_EO_NEGATE,     /* sign operator */
   HB_EO_PREINC,
   HB_EO_PREDEC      /* pre-operators -> the highest precedence */
} HB_EXPR_OPERATOR;


typedef struct HB_EXPR_
{
   union
   {
      char *asSymbol;      /* variable name */
      BOOL asLogical;      /* logical value */
      struct
      {
         char *string;      /* literal strings */
         BOOL dealloc;      /* automatic deallocate on expresion deletion */
      } asString;
      struct
      {
        struct HB_EXPR_ *pMacro;  /* macro variable */
        char *szName;             /* variable name  */
      } asRTVar;      /* PUBLIC or PRIVATE variable declaration */
      struct
      {
         HB_LONG lVal;        /* long value */
         double dVal;         /* double value */
         unsigned char bWidth; /* unsigned char used intentionally */
         unsigned char bDec;  /* unsigned char used intentionally */
         unsigned char NumType;    /* used to distinguish LONG and DOUBLE */
      } asNum;
      struct
      {
         unsigned char cMacroOp;       /* macro operator */
         unsigned char SubType;        /* context in which macro is used */
         char * szMacro;               /* identifier after the macro operator */
         struct HB_EXPR_ *pExprList;   /* list elements if &(...) was used */
         struct HB_EXPR_ *pFunCall;    /* pointer to a function if used as function's call argument */
      } asMacro;
      struct
      {
         struct HB_EXPR_ *pExprList;    /* list elements */
         struct HB_EXPR_ *pIndex;       /* array index, others */
      } asList;
      struct
      {
         BOOL isMacro;			/* TRUE=codeblock contains macro expression */
	      BOOL lateEval;			/* TRUE=late evaluation of macro */
         char *string;			/* source code of a codeblock */
         struct HB_EXPR_ *pExprList;    /* list elements */
         HB_CBVAR_PTR pLocals;      	/* list of local variables */
      } asCodeblock;
      struct
      {
         struct HB_EXPR_ *pAlias;      /* alias expression */
         struct HB_EXPR_ *pVar;        /* aliased variable or macro */
         struct HB_EXPR_ *pExpList;    /* aliased expression list */
      } asAlias;
      struct
      {
         struct HB_EXPR_ *pFunName;     /* function name */
         struct HB_EXPR_ *pParms;       /* function call parameters */
      } asFunCall;
      struct
      {
         struct HB_EXPR_ *pObject;     /* object */
         char * szMessage;             /* message */
         struct HB_EXPR_ *pParms;      /* method parameters */
      } asMessage;
      struct
      {
         struct HB_EXPR_ *pLeft;       /* object */
         struct HB_EXPR_ *pRight;      /* object */
      } asOperator;
      struct HB_EXPR_ *asReference;
   } value;
   ULONG ulLength;
   ULONG Counter;
   unsigned char ExprType;  /* internal expression type */
   USHORT ValType;          /* language level value type */
   struct HB_EXPR_ *pNext;  /* next expression in the list of expressions */
} HB_EXPR, *HB_EXPR_PTR;

/* Definitions of function templates used in expression's message
 * handling
 */
#ifdef HB_MACRO_SUPPORT
/* Compilation for macro compiler
 */
#define  HB_EXPR_FUNC( proc )  HB_EXPR_PTR proc( HB_EXPR_PTR pSelf, int iMessage, void * pMacro )
typedef  HB_EXPR_FUNC( HB_EXPR_FUNC_ );
typedef  HB_EXPR_FUNC_ *HB_EXPR_FUNC_PTR;

extern HB_EXPR_FUNC_PTR hb_comp_ExprTable[];

#define  HB_EXPR_USE( pSelf, iMessage )  \
         hb_comp_ExprTable[ (pSelf)->ExprType ]( (pSelf), (iMessage), pMacro )

typedef  HB_EXPR_PTR HB_EXPR_ACTION( HB_EXPR_PTR pSelf, int iMessage, void * pMacro );

#define HB_EXPR_PCODE0( action ) action( pMacro )
#define HB_EXPR_PCODE1( action, p1 ) action( (p1), pMacro )
#define HB_EXPR_PCODE2( action, p1, p2 ) action( (p1), (p2), pMacro )
#define HB_EXPR_PCODE3( action, p1, p2, p3 ) action( (p1), (p2), (p3), pMacro )
#define HB_EXPR_PCODE4( action, p1, p2, p3, p4 ) action( (p1), (p2), (p3), (p4), pMacro )
#define HB_EXPR_GENPCODE1( action, p1 ) action( (p1), pMacro )
#define HB_EXPR_GENPCODE2( action, p1, p2, p3 ) action( (p1), (p2), pMacro )
#define HB_EXPR_GENPCODE3( action, p1, p2, p3, p4 ) action( (p1), (p2), (p3), pMacro )
#define HB_EXPR_GENPCODE4( action, p1, p2, p3, p4, p5 ) action( (p1), (p2), (p3), (p4), pMacro )

#define HB_MACRO_VARNAME pMacro

extern  HB_EXPR_PTR hb_macroExprNew( void );
#else

#define  HB_EXPR_FUNC( proc )  HB_EXPR_PTR proc( HB_EXPR_PTR pSelf, int iMessage )
typedef  HB_EXPR_FUNC( HB_EXPR_FUNC_ );
typedef  HB_EXPR_FUNC_ *HB_EXPR_FUNC_PTR;

extern HB_EXPR_FUNC_PTR hb_comp_ExprTable[];

#define  HB_EXPR_USE( pSelf, iMessage )  \
         hb_comp_ExprTable[ (pSelf)->ExprType ]( (pSelf), (iMessage) )

typedef  HB_EXPR_PTR HB_EXPR_ACTION( HB_EXPR_PTR pSelf, int iMessage );

#define HB_EXPR_PCODE0( action ) action( )
#define HB_EXPR_PCODE1( action, p1 ) action( (p1) )
#define HB_EXPR_PCODE2( action, p1, p2 ) action( (p1), (p2) )
#define HB_EXPR_PCODE3( action, p1, p2, p3 ) action( (p1), (p2), (p3) )
#define HB_EXPR_PCODE4( action, p1, p2, p3, p4 ) action( (p1), (p2), (p3), (p4) )
#define HB_EXPR_GENPCODE1( action, p1 ) action( (p1) )
#define HB_EXPR_GENPCODE2( action, p1, p2, p3 ) action( (p1), (p2), (p3) )
#define HB_EXPR_GENPCODE3( action, p1, p2, p3, p4 ) action( (p1), (p2), (p3), (p4) )
#define HB_EXPR_GENPCODE4( action, p1, p2, p3, p4, p5 ) action( (p1), (p2), (p3), (p4), (p5) )

/* pass NULL instead of macro structure pointer */
#define HB_MACRO_DECL void *pMacro
#define HB_MACRO_PARAM NULL
#define HB_MACRO_VARNAME pMacro
#endif


HB_EXPR_PTR hb_compExprNew( int );
HB_EXPR_PTR hb_compExprNewEmpty( void );
HB_EXPR_PTR hb_compExprNewNil( void );
HB_EXPR_PTR hb_compExprNewDouble( double, BYTE, BYTE );
HB_EXPR_PTR hb_compExprNewLong( HB_LONG );
HB_EXPR_PTR hb_compExprNewDate( HB_LONG );
HB_EXPR_PTR hb_compExprNewString( char * );
HB_EXPR_PTR hb_compExprNewLogical( int );
HB_EXPR_PTR hb_compExprNewSelf( void );
HB_EXPR_PTR hb_compExprNewCodeBlock( char *, BOOL, BOOL );
HB_EXPR_PTR hb_compExprNewArray( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewVar( char * );
HB_EXPR_PTR hb_compExprNewAliasVar( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewAliasExpr( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewMacro( HB_EXPR_PTR, unsigned char, char * );
HB_EXPR_PTR hb_compExprNewFunName( char * );
HB_EXPR_PTR hb_compExprNewRTVar( char *, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewAlias( char * );
HB_EXPR_PTR hb_compExprNewEQ( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewNE( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewLT( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewLE( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewGT( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewGE( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewIN( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPlus( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewMinus( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewMult( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewDiv( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewMod( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPower( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewAssign( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewEqual( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPlusEq( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewMinusEq( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewMultEq( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewDivEq( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewModEq( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewExpEq( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPostInc( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPostDec( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPreInc( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewPreDec( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewAnd( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewOr( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewNot( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewNegate( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewVarRef( char * );
HB_EXPR_PTR hb_compExprNewFunRef( char * );
HB_EXPR_PTR hb_compExprNewRef( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewCodeblockExpr( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewFunCallArg( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewSend( HB_EXPR_PTR, char * );
HB_EXPR_PTR hb_compExprNewMethodCall( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewList( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewArgList( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprAddListExpr( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprAddCodeblockExpr( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewIIF( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprReduce( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprAssign( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprEqual( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprAssignStatic( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprClone( HB_EXPR_PTR pSrc );
ULONG hb_compExprListLen( HB_EXPR_PTR );
void hb_compExprClear( HB_EXPR_PTR );
char * hb_compExprDescription( HB_EXPR_PTR );
int hb_compExprType( HB_EXPR_PTR );
int hb_compExprIsInteger( HB_EXPR_PTR );
int hb_compExprIsLong( HB_EXPR_PTR );
int hb_compExprAsInteger( HB_EXPR_PTR );
int hb_compExprIsString( HB_EXPR_PTR );
int hb_compExprAsStringLen( HB_EXPR_PTR );
char *hb_compExprAsString( HB_EXPR_PTR );
char *hb_compExprAsSymbol( HB_EXPR_PTR );

void hb_compExprFree( HB_EXPR_PTR, HB_MACRO_DECL );
void hb_compExprErrorType( HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprListStrip( HB_EXPR_PTR, HB_MACRO_DECL );
void hb_compExprCBVarDel( HB_CBVAR_PTR );
HB_EXPR_PTR hb_compExprReducePlusStrings( HB_EXPR_PTR, HB_EXPR_PTR, HB_MACRO_DECL );
BOOL hb_compExprReduceAT( HB_EXPR_PTR, HB_MACRO_DECL );
BOOL hb_compExprReduceCHR( HB_EXPR_PTR, HB_MACRO_DECL );
BOOL hb_compExprReduceLEN( HB_EXPR_PTR, HB_MACRO_DECL );
BOOL hb_compExprReduceASC( HB_EXPR_PTR, HB_MACRO_DECL );
BOOL hb_compExprIsValidMacro( char *, BOOL *, HB_MACRO_DECL );

#ifdef HB_MACRO_SUPPORT

HB_EXPR_PTR hb_compExprNewArrayAt( HB_EXPR_PTR, HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprSetOperand( HB_EXPR_PTR, HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprGenPop( HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprGenPush( HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprGenStatement( HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprNewFunCall( HB_EXPR_PTR, HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprCBVarAdd( HB_EXPR_PTR, char *, HB_MACRO_DECL );
void hb_compExprDelete( HB_EXPR_PTR, HB_MACRO_DECL );
HB_EXPR_PTR hb_compExprSetGetBlock( HB_EXPR_PTR pExpr, HB_MACRO_DECL );

#else

HB_EXPR_PTR hb_compExprNewArrayAt( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprSetOperand( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprGenPop( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprGenPush( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprGenStatement( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprNewFunCall( HB_EXPR_PTR, HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprCBVarAdd( HB_EXPR_PTR, char *, BYTE );
void hb_compExprDelete( HB_EXPR_PTR );
HB_EXPR_PTR hb_compExprSetGetBlock( HB_EXPR_PTR pExpr );

#endif

HB_EXTERN_END

#endif  /* HB_EXPROP_H_ */