quakeforge/include/exp.h

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/*
EXP equation evaluation routines
Copyright (C) 2000, 2001 Brian Koropoff
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
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 General Public License for more details.
You should have received a copy of the GNU 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, US
*/
#ifndef __exp_h
#define __exp_h
typedef enum {TOKEN_GENERIC, TOKEN_NUM, TOKEN_OP, TOKEN_FUNC, TOKEN_OPAREN, TOKEN_CPAREN, TOKEN_COMMA}
token_type;
typedef enum {EXP_E_NORMAL = 0, EXP_E_PARSE, EXP_E_INVOP, EXP_E_PAREN,
EXP_E_INVPARAM, EXP_E_SYNTAX} exp_error_t;
typedef double (*opfunc) (double op1, double op2);
typedef double (*funcfunc) (double *oplist, unsigned int numops);
typedef struct optable_s
{
const char *str;
opfunc func;
unsigned int operands;
} optable_t;
typedef struct functable_s
{
const char *str;
funcfunc func; // Heh
unsigned int operands;
} functable_t;
typedef struct token_generic_s
{
token_type type;
union token_u *prev, *next;
} token_generic;
typedef struct token_num_s
{
token_type type;
union token_u *prev, *next;
double value;
} token_num;
typedef struct token_op_s
{
token_type type;
union token_u *prev, *next;
optable_t *op;
} token_op;
typedef struct token_func_s
{
token_type type;
union token_u *prev, *next;
functable_t *func;
} token_func;
typedef union token_u
{
token_generic generic;
token_num num;
token_op op;
token_func func;
} token;
extern exp_error_t EXP_ERROR;
const char *EXP_GetErrorMsg (void) __attribute__((pure));
token *EXP_ParseString (char *str);
exp_error_t EXP_SimplifyTokens (token *chain);
void EXP_RemoveToken (token *tok);
void EXP_DestroyTokens (token *chain);
double EXP_Evaluate (char *str);
void EXP_InsertTokenAfter (token *spot, token *new);
exp_error_t EXP_Validate (token *chain);
void EXP_PrintTokens (token *chain);
#endif // __exp_h