Category : Printer + Display Graphics
Archive   : RAYSH386.ZIP
Filename : EXPR.H

/*
* expr.h
*
* Copyright (C) 1989, 1991, Craig E. Kolb, Rod G. Bogart
* All rights reserved.
*
* This software may be freely copied, modified, and redistributed
* provided that this copyright notice is preserved on all copies.
*
* You may not distribute this software, in whole or in part, as part of
* any commercial product without the express consent of the authors.
*
* There is no warranty or other guarantee of fitness of this software
* for any purpose. It is provided solely "as is".
*
* $Id: expr.h,v 4.0 91/07/17 14:30:47 kolb Exp Locker: kolb $
*
* $Log: expr.h,v $
* Revision 4.0 91/07/17 14:30:47 kolb
* Initial version.
*
*/
#ifndef EXPR_H
#define EXPR_H

#define FLOAT_EXPR 0
#define BUILTIN_EXPR 1

typedef struct Expr {
short type, /* Expr type (float/builtin/time) */
timevary, /* does the expr vary over time? */
symtab, /* is the expr in the symtab? */
nparams; /* # of params, if builtin */
Float value, /* float val/last eval if timeexpr */
timenow, /* time of last evaluation */
(*function)();
struct Expr **params; /* parameters, if a builtin */
} Expr;

typedef struct ExprAssoc {
Float *lhs; /* left-hand side */
Expr *expr; /* right-hand side */
struct ExprAssoc *next; /* Next in list */
} ExprAssoc;

extern Float ExprEval();

extern Expr *ExprResolve1(), *ExprResolve2(), *ExprResolve3(),
*ExprResolve4(), *ExprResolve5(), *ExprFloatCreate();
extern Expr *TimeExpr, *FrameExpr, *ExprReuseFloatCreate();

extern ExprAssoc *AssocCreate();

#endif /* EXPR_H */