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/* xbexp.h
Xbase64 project source code
This file contains a header file for the EXP object, which is
used for expression processing.
Copyright (C) 1997,2003 Gary A Kunkel
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact:
Email:
xdb-devel@lists.sourceforge.net
xdb-users@lists.sourceforge.net
Regular Mail:
XBase Support
149C South Main St
Keller Texas, 76248
USA
*/
#ifndef __XB_EXP_H__
#define __XB_EXP_H__
#ifdef __GNU LesserG__
#pragma interface
#endif
#include <xbase64/xbase64.h>
#ifdef XB_EXPRESSIONS /* compile if expression logic on */
#include <xbase64/xbtypes.h>
/*! \file xbexp.h
*/
#undef ABS
#undef MIN
#undef MAX
class XBDLLEXPORT xbDbf;
/************************************************************************/
//! xbFuncDtl struct
/*! This structure defines function information
*/
struct XBDLLEXPORT xbFuncDtl {
const char * FuncName; /* function name */
xbShort ParmCnt; /* no of parms it needs */
char ReturnType; /* return type of function */
void (*ExpFuncPtr)(); /* pointer to function routine */
};
/************************************************************************/
//! xbExpNode struct
/*! This class defines a node within a tree of nodes, each token
in an expression gets placed onto its own node
*/
class XBDLLEXPORT xbExpNode {
public:
xbExpNode();
virtual ~xbExpNode();
public:
char * NodeText; /* expression text */
char Type; /* same as TokenType below */
xbShort Len; /* length of expression text */
xbShort InTree; /* this node in the tree? 1=yes */
xbExpNode * Node; /* pointer to parent */
xbExpNode * Sibling1; /* pointer to sibling 1 */
xbExpNode * Sibling2; /* pointer to sibling 2 */
xbExpNode * Sibling3; /* pointe/r to sibling 3 */
xbShort DataLen; /* length of data in result buffer */
xbShort ResultLen; /* length of result buffer */
xbString StringResult; /* string result */
xbDouble DoubResult; /* Numeric Result */
xbShort IntResult; /* logical result */
xbDbf * dbf; /* pointer to datafile */
xbShort FieldNo; /* field no if DBF field */
char ExpressionType; /* used in head node C,N,L or D */
};
/************************************************************************/
//! xbStackElement class
/*!
*/
class XBDLLEXPORT xbStackElement
{
public:
xbStackElement();
~xbStackElement();
friend class xbExpn;
private:
xbStackElement *Previous;
xbStackElement *Next;
xbExpNode *NodePtr;
};
/************************************************************************/
//! xbExpn class
/*! This class is used for processing expressions
*/
/* Expression handler */
class XBDLLEXPORT xbExpn{
public:
xbExpn( xbXBase * );
virtual ~xbExpn();
xbShort GetNextToken( const char *s, xbShort MaxLen );
xbShort ProcessExpression( xbExpNode *n, xbShort );
xbShort ProcessExpression( xbShort opt )
{ return ProcessExpression( Tree, opt ); }
xbExpNode * GetTree() { return Tree; }
void SetTreeToNull() { Tree = NULL; }
xbExpNode * GetFirstTreeNode( xbExpNode * );
xbExpNode * GetFirstTreeNode()
{ return GetFirstTreeNode( Tree ); }
xbShort ProcessExpression( const char *exp, xbDbf * d );
xbShort ParseExpression( const char *exp, xbDbf * d );
xbExpNode * GetExpressionHandle();
char GetExpressionResultType( xbExpNode * );
char GetExpressionResultType()
{ return GetExpressionResultType( Tree ); }
char * GetCharResult();
xbString & GetStringResult();
xbDouble GetDoubleResult();
xbLong GetIntResult();
xbShort ProcessExpression( xbExpNode * );
xbShort ProcessExpression() { return ProcessExpression( Tree ); }
xbShort BuildExpressionTree( const char * Expression, xbShort MaxTokenLen,
xbDbf *d );
/* stack functions */
void InitStack();
xbExpNode * Pop();
xbShort Push(xbExpNode *);
xbShort GetStackDepth() { return StackDepth; }
void DumpStack();
const char * GetValidFuncName( xbShort funcNo )
{ return XbaseFuncList[funcNo].FuncName; }
#ifdef XBASE_DEBUG
void DumpExpressionTree( xbShort printOption )
{ DumpExpressionTree( Tree, printOption ); }
void DumpExpressionTree( xbExpNode *, xbShort printOption );
void DumpExpNode( xbExpNode *, xbShort printOption );
#endif
/* expression methods */
xbDouble ABS( xbDouble );
xbLong ASC( const char * );
xbLong AT( const char *, const char * );
char * CDOW( const char * );
char * CHR( xbLong );
char * CMONTH( const char * );
char * CTOD( const char * );
char * DATE();
xbLong DAY( const char * );
char * DESCEND( const char * );
xbLong DESCEND( const xbDate & );
xbDouble DESCEND( xbDouble );
xbLong DOW( const char * );
char * DTOC( const char * );
char * DTOS( const char * );
xbDouble EXP( xbDouble );
char * IIF( xbShort, const char *, const char * );
xbLong INT( xbDouble );
xbLong ISALPHA( const char * );
xbLong ISLOWER( const char * );
xbLong ISUPPER( const char * );
char * LEFT( const char *, xbShort );
xbLong LEN( const char * );
xbDouble LOG( xbDouble );
char * LOWER( const char * );
char * LTRIM( const char * );
xbDouble MAX( xbDouble, xbDouble );
xbLong MONTH( const char * ); /* MONTH() */
xbDouble MIN( xbDouble, xbDouble );
xbLong RECNO( xbDbf * );
char * REPLICATE( const char *, xbShort );
char * RIGHT( const char *, xbShort );
char * RTRIM( const char * );
char * SPACE( xbShort );
xbDouble SQRT( xbDouble );
char * STR( const char * );
char * STR( const char *, xbShort );
char * STR( const char *, xbShort, xbShort );
char * STR( xbDouble );
char * STR( xbDouble, xbShort );
char * STR(xbDouble, xbUShort length, xbShort numDecimals );
char * STRZERO( const char * );
char * STRZERO( const char *, xbShort );
char * STRZERO( const char *, xbShort, xbShort );
char * STRZERO( xbDouble );
char * STRZERO( xbDouble, xbShort );
char * STRZERO( xbDouble, xbShort, xbShort );
char * SUBSTR( const char *, xbShort, xbShort );
char * TRIM( const char * );
char * UPPER( const char * );
xbLong VAL( const char * );
xbLong YEAR( const char * );
protected:
xbShort IsWhiteSpace( char );
char IsSeparator( char );
xbExpNode * LoadExpNode( const char * ENodeText, const char EType,
const xbShort ELen, const xbShort BufLen );
xbShort OperatorWeight( const char *Oper, xbShort len );
xbShort ReduceComplexExpression( const char * NextToken, xbShort Len,
xbExpNode * cn, xbDbf *d );
xbShort GetFunctionTokenLen( const char *s );
xbShort ReduceFunction( const char *NextToken, xbExpNode *cn, xbDbf *d );
xbExpNode * GetNextTreeNode( xbExpNode * );
xbShort ProcessOperator( xbShort );
xbShort ProcessFunction( char * );
xbShort ValidOperation( char *, char, char );
char GetOperandType( xbExpNode * );
xbShort AlphaOperation( char * );
xbShort NumericOperation( char * );
xbShort GetFuncInfo( const char *Function, xbShort Option );
xbDouble GetDoub( xbExpNode * );
xbLong GetInt( xbExpNode * );
private:
xbXBase *xbase;
xbFuncDtl *XbaseFuncList; /* pointer to list of Xbase functions */
xbExpNode *Tree; /* pointer to tree of parsed nodes */
xbShort LogicalType; /* set to 1 for logical type nodes */
char TokenType; /* E - Expression, not in simplest form */
/* C - Constant */
/* N - Numeric Constant */
/* O - Operator */
/* F - Function */
/* D - Database Field */
/* s - character string result */
/* l - logical or short int result */
/* d - double result */
char PreviousType; /* used to see if "-" follows operator */
char * Op1; /* pointer to operand 1 */
char * Op2; /* pointer to operand 2 */
xbDouble Opd1; /* double result 1 */
xbDouble Opd2; /* double result 2 */
xbShort OpLen1; /* length of memory allocated to operand 1 */
xbShort OpLen2; /* length of memory allocated to operand 2 */
xbShort OpDataLen1; /* length of data in op1 */
xbShort OpDataLen2; /* length of data in op2 */
char OpType1; /* type of operand 1 */
char OpType2; /* type of operand 2 */
xbShort TokenLen; /* length of token */
// static xbString DefaultDateFormat; /*default date format for DTOC func*/
enum { WorkBufMaxLen = 200 };
char WorkBuf[WorkBufMaxLen+1];
/* stack variables */
xbShort StackDepth;
xbStackElement *First;
xbStackElement *Last;
};
#endif // XB_EXPRESSIONS
#endif // __XB_EXP_H__
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