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/*@@
@header util_Expression.h
@date Tue Sep 19 22:02:45 2000
@author Tom Goodale
@desc
Header for expression stuff.
@enddesc
@version $Header$
@@*/
#ifndef __UTIL_EXPRESSION_H__
#define __UTIL_EXPRESSION_H__ 1
#ifdef __cplusplus
extern "C"
{
#endif
/* These data types are for internal use only. */
/* Defined operators */
typedef enum {OP_NONE,
OP_EQUALS,
OP_LESS_THAN,
OP_GREATER_THAN,
OP_LEQUALS,
OP_GEQUALS,
OP_AND,
OP_OR,
OP_PLUS,
OP_MINUS,
OP_DIV,
OP_TIMES,
OP_POWER,
OP_ACOS,
OP_ASIN,
OP_ATAN,
OP_CEIL,
OP_COS,
OP_COSH,
OP_EXP,
OP_FABS,
OP_FLOOR,
OP_LOG,
OP_LOG10,
OP_SIN,
OP_SINH,
OP_SQRT,
OP_TAN,
OP_TANH}
uExpressionOpcode;
/* What sort of expression types we have. */
typedef enum {val,unary,binary} uExpressionType;
/* RPN object. */
typedef struct
{
uExpressionType type;
union
{
uExpressionOpcode opcode;
int varnum;
} token;
} uExpressionToken;
/* Parsed expression object. */
typedef struct
{
int ntokens;
uExpressionToken *tokens;
int nvars;
const char **vars;
} uExpressionInternals;
/* Beginning of externally useable objects. */
/* Structure to hold values. */
typedef struct
{
enum {rval,ival} type;
union
{
double rval;
int ival;
} value;
} uExpressionValue;
/* Externally visible representation of the expression. */
typedef uExpressionInternals *uExpression;
uExpression Util_ExpressionParse(const char *expression);
int Util_ExpressionEvaluate(const uExpression buffer,
uExpressionValue *retval,
int (*eval)(int, const char * const *, uExpressionValue *, void *),
void *data);
void Util_ExpressionFree(uExpression buffer);
#ifdef __cplusplus
}
#endif
#endif /* __UTIL_EXPRESSION_H__ */
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