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/* -*-c-*- -------------- mix_eval.c :
* Implementation of the functions declared in mix_eval.h
* ------------------------------------------------------------------
* Copyright (C) 2000, 2007 Free Software Foundation, Inc.
*
* 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "xmix_eval.h"
static const gchar *errors_[] = {
N_("Successful evaluation"),
N_("Syntax error in expression"),
N_("Out of range F-specification"),
N_("Mismatched parenthesis"),
N_("Undefined symbol"),
N_("Internal error")
};
/* create a new evaluator */
mix_eval_t *
mix_eval_new (void)
{
mix_eval_t *result = g_new (mix_eval_t, 1);
result->table = mix_symbol_table_new ();
if (result->table == NULL) {
g_free (result);
return NULL;
}
result->towner = TRUE;
result->value = MIX_WORD_ZERO;
result->errpos = 0;
return result;
}
/* create a new evaluator with an external symbol table */
mix_eval_t *
mix_eval_new_with_table (mix_symbol_table_t *table)
{
mix_eval_t *result = g_new (mix_eval_t, 1);
result->table = table;
result->towner = FALSE;
result->value = MIX_WORD_ZERO;
result->errpos = 0;
return result;
}
/* delete */
void
mix_eval_delete (mix_eval_t *eval)
{
g_return_if_fail (eval);
if (eval->table && eval->towner) {
mix_symbol_table_delete (eval->table);
}
g_free (eval);
}
/* eval an expression */
mix_eval_result_t
mix_eval_expression_with_loc (mix_eval_t *eval, const gchar *expr,
mix_short_t loc)
{
mix_eval_data_ data;
if (expr == NULL || eval == NULL)
return MIX_EVAL_INTERN;
data.expr = g_strdup_printf ("%s\n", expr);
data.table = eval->table;
data.errpos = eval->errpos;
data.value = eval->value;
data.loc = loc;
eval->result = mix_eval_expr (&data);
if (eval->result == MIX_EVAL_OK) {
eval->value = data.value;
eval->errpos = -1;
} else {
eval->errpos = data.errpos;
}
g_free (data.expr);
return eval->result;
}
/* get the result of the last evaluation */
mix_word_t
mix_eval_value (const mix_eval_t *eval)
{
g_return_val_if_fail (eval != NULL, MIX_WORD_ZERO);
return eval->value;
}
/* get the last eval result code */
mix_eval_result_t
mix_eval_last_error (const mix_eval_t *eval)
{
g_return_val_if_fail (eval != NULL, MIX_EVAL_INTERN);
return eval->result;
}
/* get the last error string */
const gchar*
mix_eval_last_error_string (const mix_eval_t *eval)
{
g_return_val_if_fail (eval != NULL, errors_[MIX_EVAL_INTERN]);
return errors_[eval->result];
}
/* get the position of last error */
guint
mix_eval_last_error_pos (const mix_eval_t *eval)
{
g_return_val_if_fail (eval != NULL, 0);
return eval->errpos;
}
/* add, or redefine, a symbol. see mix_symbol_table.h for
possible outcomes. */
gint
mix_eval_set_symbol (mix_eval_t *eval, const gchar *symbol,
mix_word_t value)
{
g_return_val_if_fail (eval != NULL && eval->table != NULL,
MIX_SYM_FAIL);
return mix_symbol_table_insert (eval->table, symbol, value);
}
void
mix_eval_remove_symbol (mix_eval_t *eval, const gchar *symbol)
{
g_return_if_fail (eval != NULL && eval->table != NULL);
mix_symbol_table_remove (eval->table, symbol);
}
void
mix_eval_use_symbol_table (mix_eval_t *eval,
mix_symbol_table_t *table)
{
g_return_if_fail (eval != NULL);
if (eval->table != NULL && eval->towner)
mix_symbol_table_delete (eval->table);
eval->table = table;
eval->towner = FALSE;
}
const mix_symbol_table_t *
mix_eval_symbol_table (const mix_eval_t *eval)
{
g_return_val_if_fail (eval != NULL, NULL);
return eval->table;
}
gboolean
mix_eval_set_symbols_from_table (mix_eval_t *eval,
const mix_symbol_table_t *table)
{
g_return_val_if_fail (eval != NULL, FALSE);
if (eval->table != NULL)
return mix_symbol_table_merge_table (eval->table, table);
else
return FALSE;
}
gboolean
mix_eval_remove_symbols_from_table (mix_eval_t *eval,
const mix_symbol_table_t *table)
{
g_return_val_if_fail (eval != NULL, FALSE);
if (eval->table != NULL)
return mix_symbol_table_subtract_table (eval->table, table);
else
return FALSE;
}
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