93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/*
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EXP equation evaluation routines
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Copyright (C) 2000, 2001 Brian Koropoff
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, US
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*/
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#ifndef __exp_h
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#define __exp_h
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typedef enum {TOKEN_GENERIC, TOKEN_NUM, TOKEN_OP, TOKEN_FUNC, TOKEN_OPAREN, TOKEN_CPAREN, TOKEN_COMMA}
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token_type;
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typedef enum {EXP_E_NORMAL = 0, EXP_E_PARSE, EXP_E_INVOP, EXP_E_PAREN,
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EXP_E_INVPARAM, EXP_E_SYNTAX} exp_error_t;
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typedef double (*opfunc) (double op1, double op2);
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typedef double (*funcfunc) (double *oplist, unsigned int numops);
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typedef struct optable_s
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{
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const char *str;
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opfunc func;
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unsigned int operands;
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} optable_t;
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typedef struct functable_s
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{
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const char *str;
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funcfunc func; // Heh
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unsigned int operands;
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} functable_t;
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typedef struct token_generic_s
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{
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token_type type;
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union token_u *prev, *next;
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} token_generic;
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typedef struct token_num_s
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{
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token_type type;
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union token_u *prev, *next;
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double value;
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} token_num;
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typedef struct token_op_s
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{
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token_type type;
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union token_u *prev, *next;
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optable_t *op;
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} token_op;
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typedef struct token_func_s
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{
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token_type type;
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union token_u *prev, *next;
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functable_t *func;
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} token_func;
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typedef union token_u
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{
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token_generic generic;
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token_num num;
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token_op op;
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token_func func;
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} token;
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extern exp_error_t EXP_ERROR;
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const char *EXP_GetErrorMsg (void);
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token *EXP_ParseString (char *str);
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exp_error_t EXP_SimplifyTokens (token *chain);
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void EXP_RemoveToken (token *tok);
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void EXP_DestroyTokens (token *chain);
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double EXP_Evaluate (char *str);
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void EXP_InsertTokenAfter (token *spot, token *new);
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exp_error_t EXP_Validate (token *chain);
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void EXP_PrintTokens (token *chain);
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#endif // __exp_h
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