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/*******************************************************/
/* "C" Language Integrated Production System */
/* */
/* CLIPS Version 6.40 11/01/16 */
/* */
/* EXPRESSION HEADER FILE */
/*******************************************************/
/*************************************************************/
/* Purpose: Contains routines for creating, deleting, */
/* compacting, installing, and hashing expressions. */
/* */
/* Principal Programmer(s): */
/* Gary D. Riley */
/* */
/* Contributing Programmer(s): */
/* Brian L. Dantes */
/* */
/* Revision History: */
/* */
/* 6.24: Renamed BOOLEAN macro type to intBool. */
/* */
/* 6.30: Removed conditional code for unsupported */
/* compilers/operating systems (IBM_MCW and */
/* MAC_MCW). */
/* */
/* Changed integer type/precision. */
/* */
/* Changed expression hashing value. */
/* */
/* 6.40: Removed LOCALE definition. */
/* */
/* Pragma once and other inclusion changes. */
/* */
/* Added support for booleans with <stdbool.h>. */
/* */
/* Removed use of void pointers for specific */
/* data structures. */
/* */
/* Eval support for run time and bload only. */
/* */
/*************************************************************/
#ifndef _H_expressn
#pragma once
#define _H_expressn
struct exprHashNode;
typedef struct savedContexts SavedContexts;
#include "entities.h"
#include "exprnops.h"
#include "constrct.h"
/******************************/
/* Expression Data Structures */
/******************************/
struct expr
{
unsigned short type;
union
{
void *value;
CLIPSLexeme *lexemeValue;
CLIPSFloat *floatValue;
CLIPSInteger *integerValue;
CLIPSBitMap *bitMapValue;
ConstructHeader *constructValue;
FunctionDefinition *functionValue;
};
Expression *argList;
Expression *nextArg;
};
#define arg_list argList
#define next_arg nextArg
typedef struct exprHashNode
{
unsigned hashval;
unsigned count;
Expression *exp;
struct exprHashNode *next;
unsigned long bsaveID;
} EXPRESSION_HN;
struct savedContexts
{
bool rtn;
bool brk;
struct savedContexts *nxt;
};
#define EXPRESSION_HASH_SIZE 503
/********************/
/* ENVIRONMENT DATA */
/********************/
#define EXPRESSION_DATA 45
struct expressionData
{
FunctionDefinition *PTR_AND;
FunctionDefinition *PTR_OR;
FunctionDefinition *PTR_EQ;
FunctionDefinition *PTR_NEQ;
FunctionDefinition *PTR_NOT;
EXPRESSION_HN **ExpressionHashTable;
#if (BLOAD || BLOAD_ONLY || BLOAD_AND_BSAVE)
unsigned long NumberOfExpressions;
Expression *ExpressionArray;
unsigned long ExpressionCount;
#endif
SavedContexts *svContexts;
bool ReturnContext;
bool BreakContext;
bool SequenceOpMode;
};
#define ExpressionData(theEnv) ((struct expressionData *) GetEnvironmentData(theEnv,EXPRESSION_DATA))
/********************/
/* Global Functions */
/********************/
void ReturnExpression(Environment *,Expression *);
void ExpressionInstall(Environment *,Expression *);
void ExpressionDeinstall(Environment *,Expression *);
Expression *PackExpression(Environment *,Expression *);
void ReturnPackedExpression(Environment *,Expression *);
void InitExpressionData(Environment *);
void InitExpressionPointers(Environment *);
bool SetSequenceOperatorRecognition(Environment *,bool);
bool GetSequenceOperatorRecognition(Environment *);
#if (! BLOAD_ONLY) && (! RUN_TIME)
Expression *AddHashedExpression(Environment *,Expression *);
#endif
void RemoveHashedExpression(Environment *,Expression *);
#if BLOAD_AND_BSAVE || BLOAD_ONLY || BLOAD || CONSTRUCT_COMPILER
unsigned long HashedExpressionIndex(Environment *,Expression *);
#endif
#endif