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/* -*-c-*- ---------------- mix_eval.h :
* mix_eval_t is an evaluator of MIX W-expressions
* ------------------------------------------------------------------
* Last change: Time-stamp: <00/12/02 23:11:44 jose>
* ------------------------------------------------------------------
* Copyright (C) 2000 jose antonio ortega ruiz <jaortega@acm.org>
*
* 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, USA.
*
*/
#ifndef MIX_EVAL_H
#define MIX_EVAL_H
#include "mix.h"
#include "mix_types.h"
#include "mix_symbol_table.h"
/* the evaluator type */
typedef struct mix_eval_t mix_eval_t;
/* possible evaluation outcomes*/
typedef enum {
MIX_EVAL_OK, /* sucess*/
MIX_EVAL_SYNTAX, /* syntax error */
MIX_EVAL_INV_FSPEC, /* out of range fspec */
MIX_EVAL_MIS_PAREN, /* mismatched parenthesis */
MIX_EVAL_UNDEF_SYM, /* undefined symbol */
MIX_EVAL_INTERN /* internal error */
} mix_eval_result_t;
/* create a new evaluator */
extern mix_eval_t *
mix_eval_new (void);
/* create a new evaluator with an external symbol table */
extern mix_eval_t *
mix_eval_new_with_table (mix_symbol_table_t *table);
/* delete */
extern void
mix_eval_delete (mix_eval_t *eval);
/* eval an expression providing a value for loc counter */
extern mix_eval_result_t
mix_eval_expression_with_loc (mix_eval_t *eval, const gchar *expr,
mix_short_t loc);
/* eval an expression with null loc*/
#define mix_eval_expression (eval,expr) \
mix_eval_expression_with_loc (eval, expr, MIX_SHORT_ZERO)
/* get the result of the last evaluation */
extern mix_word_t
mix_eval_value (mix_eval_t *eval);
/* get the last eval result code */
extern mix_eval_result_t
mix_eval_last_error (mix_eval_t *eval);
/* get the last error string */
extern const gchar*
mix_eval_last_error_string (mix_eval_t *eval);
/* get the position of last error */
extern guint
mix_eval_last_error_pos (mix_eval_t *eval);
/* add, or redefine, a symbol. see mix_symbol_table.h for
possible outcomes. */
extern gint
mix_eval_set_symbol (mix_eval_t *eval, const gchar *symbol,
mix_word_t value);
extern void
mix_eval_remove_symbol (mix_eval_t *eval, const gchar *symbol);
#endif /* MIX_EVAL_H */
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