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arvevaluator.c
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/* Aravis - Digital camera library
*
* Copyright © 2009-2022 Emmanuel Pacaud
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
* Author: Emmanuel Pacaud <[email protected]>
*/
/**
* SECTION: arvevaluator
* @short_description: A math expression evaluator with Genicam syntax
*/
#include <arvevaluator.h>
#include <arvdebugprivate.h>
#include <arvmiscprivate.h>
#include <arvstr.h>
#include <math.h>
#include <stdlib.h>
#define ARV_EVALUATOR_STACK_SIZE 128
typedef enum {
ARV_EVALUATOR_STATUS_SUCCESS,
ARV_EVALUATOR_STATUS_NOT_PARSED,
ARV_EVALUATOR_STATUS_EMPTY_EXPRESSION,
ARV_EVALUATOR_STATUS_PARENTHESES_MISMATCH,
ARV_EVALUATOR_STATUS_SYNTAX_ERROR,
ARV_EVALUATOR_STATUS_UNKNOWN_OPERATOR,
ARV_EVALUATOR_STATUS_UNKNOWN_VARIABLE,
ARV_EVALUATOR_STATUS_UNKNOWN_SUB_EXPRESSION,
ARV_EVALUATOR_STATUS_UNKNOWN_CONSTANT,
ARV_EVALUATOR_STATUS_MISSING_ARGUMENTS,
ARV_EVALUATOR_STATUS_REMAINING_OPERANDS,
ARV_EVALUATOR_STATUS_DIVISION_BY_ZERO,
ARV_EVALUATOR_STATUS_STACK_OVERFLOW,
ARV_EVALUATOR_STATUS_INVALID_DOUBLE_FUNCTION,
ARV_EVALUATOR_STATUS_FORBIDDEN_RECUSRION
} ArvEvaluatorStatus;
typedef struct {
char *expression;
GSList *rpn_stack;
ArvEvaluatorStatus parsing_status;
GHashTable *variables;
GHashTable *sub_expressions;
GHashTable *constants;
} ArvEvaluatorPrivate;
struct _ArvEvaluator {
GObject object;
ArvEvaluatorPrivate *priv;
};
struct _ArvEvaluatorClass {
GObjectClass parent_class;
};
G_DEFINE_TYPE_WITH_CODE (ArvEvaluator, arv_evaluator, G_TYPE_OBJECT, G_ADD_PRIVATE (ArvEvaluator))
static const char *arv_evaluator_status_strings[] = {
"success",
"not parsed",
"empty expression",
"parentheses mismatch",
"syntax error",
"unknown operator",
"unknown variable",
"unknown subexpression",
"unknown constant",
"missing arguments",
"remaining operands",
"division by zero",
"stack overflow",
"invalid double function",
"forbidden recursion"
};
typedef enum {
ARV_EVALUATOR_TOKEN_UNKNOWN,
ARV_EVALUATOR_TOKEN_COMMA,
ARV_EVALUATOR_TOKEN_TERNARY_QUESTION_MARK,
ARV_EVALUATOR_TOKEN_TERNARY_COLON,
ARV_EVALUATOR_TOKEN_LOGICAL_OR,
ARV_EVALUATOR_TOKEN_LOGICAL_AND,
ARV_EVALUATOR_TOKEN_BITWISE_OR,
ARV_EVALUATOR_TOKEN_BITWISE_XOR,
ARV_EVALUATOR_TOKEN_BITWISE_AND,
ARV_EVALUATOR_TOKEN_EQUAL,
ARV_EVALUATOR_TOKEN_NOT_EQUAL,
ARV_EVALUATOR_TOKEN_LESS_OR_EQUAL,
ARV_EVALUATOR_TOKEN_GREATER_OR_EQUAL,
ARV_EVALUATOR_TOKEN_LESS,
ARV_EVALUATOR_TOKEN_GREATER,
ARV_EVALUATOR_TOKEN_SHIFT_RIGHT,
ARV_EVALUATOR_TOKEN_SHIFT_LEFT,
ARV_EVALUATOR_TOKEN_SUBSTRACTION,
ARV_EVALUATOR_TOKEN_ADDITION,
ARV_EVALUATOR_TOKEN_REMAINDER,
ARV_EVALUATOR_TOKEN_DIVISION,
ARV_EVALUATOR_TOKEN_MULTIPLICATION,
ARV_EVALUATOR_TOKEN_POWER,
ARV_EVALUATOR_TOKEN_MINUS,
ARV_EVALUATOR_TOKEN_PLUS,
ARV_EVALUATOR_TOKEN_BITWISE_NOT,
ARV_EVALUATOR_TOKEN_FUNCTION_SIN,
ARV_EVALUATOR_TOKEN_FUNCTION_COS,
ARV_EVALUATOR_TOKEN_FUNCTION_SGN,
ARV_EVALUATOR_TOKEN_FUNCTION_NEG,
ARV_EVALUATOR_TOKEN_FUNCTION_ATAN,
ARV_EVALUATOR_TOKEN_FUNCTION_TAN,
ARV_EVALUATOR_TOKEN_FUNCTION_ABS,
ARV_EVALUATOR_TOKEN_FUNCTION_EXP,
ARV_EVALUATOR_TOKEN_FUNCTION_LN,
ARV_EVALUATOR_TOKEN_FUNCTION_LG,
ARV_EVALUATOR_TOKEN_FUNCTION_SQRT,
ARV_EVALUATOR_TOKEN_FUNCTION_TRUNC,
ARV_EVALUATOR_TOKEN_FUNCTION_ROUND,
ARV_EVALUATOR_TOKEN_FUNCTION_FLOOR,
ARV_EVALUATOR_TOKEN_FUNCTION_CEIL,
ARV_EVALUATOR_TOKEN_FUNCTION_ASIN,
ARV_EVALUATOR_TOKEN_FUNCTION_ACOS,
ARV_EVALUATOR_TOKEN_RIGHT_PARENTHESIS,
ARV_EVALUATOR_TOKEN_LEFT_PARENTHESIS,
ARV_EVALUATOR_TOKEN_CONSTANT_INT64,
ARV_EVALUATOR_TOKEN_CONSTANT_DOUBLE,
ARV_EVALUATOR_TOKEN_VARIABLE
} ArvEvaluatorTokenId;
typedef enum {
ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT,
ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT
} ArvEvaluatorTokenAssociativity;
typedef struct {
const char * tag;
int precedence;
gboolean double_only;
int n_args;
ArvEvaluatorTokenAssociativity associativity;
} ArvEvaluatorTokenInfos;
static ArvEvaluatorTokenInfos arv_evaluator_token_infos[] = {
{"", 0, FALSE, 1, 0}, /* UNKNOWN */
{",", 0, FALSE, 0, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* COMMA */
{"?", 5, FALSE, 3, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT}, /* TERNARY_QUESTION_MARK */
{":", 5, FALSE, 1, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT}, /* TERNARY_COLON */
{"||", 10, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* LOGICAL_OR */
{"&&", 20, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* LOGICAL_AND */
{"|", 40, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* BITWISE_OR */
{"^", 50, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* BITWISE_XOR */
{"&", 60, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* BITWISE_AND */
{"=", 70, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* EQUAL, */
{"<>", 70, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* NOT_EQUAL */
{"<=", 80, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* LESS_OR_EQUAL */
{">=", 80, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* GREATER_OR_EQUAL */
{"<", 80, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* LESS */
{">", 80, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* GREATER */
{">>", 90, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* SHIFT_RIGHT */
{"<<", 90, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* SHIFT_LEFT */
{"-", 100, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* SUBSTRACTION */
{"+", 100, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* ADDITION */
{"%", 110, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* REMAINDER */
{"/", 110, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* DIVISION */
{"*", 110, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT}, /* MULTIPLICATION */
{"**", 120, FALSE, 2, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT}, /* POWER */
{"minus", 130, FALSE, 1, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT}, /* MINUS */
{"plus", 130, FALSE, 1, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT}, /* PLUS */
{"~", 130, FALSE, 1, ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT}, /* BITWISE_NOT */
{"sin", 200, TRUE, 1, 0}, /* FUNCTION_SIN */
{"cos", 200, TRUE, 1, 0}, /* FUNCTION_COS */
{"sgn", 200, FALSE, 1, 0}, /* FUNCTION_SGN */
{"neg", 200, FALSE, 1, 0}, /* FUNCTION_NEG */
{"atan", 200, TRUE, 1, 0}, /* FUNCTION_ATAN */
{"tan" , 200, TRUE, 1, 0}, /* FUNCTION_TAN */
{"abs" , 200, TRUE, 1, 0}, /* FUNCTION_ABS */
{"exp" , 200, TRUE, 1, 0}, /* FUNCTION_EXP */
{"ln", 200, TRUE, 1, 0}, /* FUNCTION_LN */
{"lg", 200, TRUE, 1, 0}, /* FUNCTION_LG */
{"sqrt", 200, TRUE, 1, 0}, /* FUNCTION_SQRT */
{"trunc", 200, TRUE, 1, 0}, /* FUNCTION_TRUNC */
{"round", 200, TRUE, 1, 0}, /* FUNCTION_ROUND */
{"floor", 200, TRUE, 1, 0}, /* FUNCTION_FLOOR */
{"ceil", 200, TRUE, 1, 0}, /* FUNCTION_CEIL */
{"asin", 200, TRUE, 1, 0}, /* FUNCTION_ASIN */
{"acos", 200, TRUE, 1, 0}, /* FUNCTION_ACOS */
{")", 990, FALSE, 0, 0}, /* RIGHT_PARENTHESIS */
{"(", -1, FALSE, 0, 0}, /* LEFT_PARENTHESIS */
{"int64", 200, FALSE, 0, 0}, /* CONSTANT_INT64 */
{"double", 200, FALSE, 0, 0}, /* CONSTANT_DOUBLE */
{"var", 200, FALSE, 0, 0}, /* VARIABLE */
};
typedef struct {
ArvEvaluatorTokenId token_id;
gint32 parenthesis_level;
union {
double v_double;
gint64 v_int64;
char * name;
} data;
} ArvEvaluatorToken;
typedef struct {
gint32 parenthesis_level;
ArvValue value;
} ArvEvaluatorValuesStackItem;
static ArvEvaluatorToken *
arv_evaluator_token_new (ArvEvaluatorTokenId token_id)
{
ArvEvaluatorToken *token = g_new0 (ArvEvaluatorToken, 1);
token->token_id = token_id;
return token;
}
static ArvEvaluatorToken *
arv_evaluator_token_new_double (double v_double)
{
ArvEvaluatorToken *token = arv_evaluator_token_new (ARV_EVALUATOR_TOKEN_CONSTANT_DOUBLE);
token->data.v_double = v_double;
return token;
}
static ArvEvaluatorToken *
arv_evaluator_token_new_int64 (double v_int64)
{
ArvEvaluatorToken *token = arv_evaluator_token_new (ARV_EVALUATOR_TOKEN_CONSTANT_INT64);
token->data.v_int64 = v_int64;
return token;
}
static ArvEvaluatorToken *
arv_evaluator_token_new_variable (const char *name)
{
ArvEvaluatorToken *token = arv_evaluator_token_new (ARV_EVALUATOR_TOKEN_VARIABLE);
token->data.name = g_strdup (name);
return token;
}
static void
arv_evaluator_token_free (ArvEvaluatorToken *token)
{
if (token == NULL)
return;
if (token->token_id == ARV_EVALUATOR_TOKEN_VARIABLE)
g_free (token->data.name);
g_free (token);
}
static void
arv_evaluator_token_debug (ArvEvaluatorToken *token, GHashTable *variables)
{
ArvValue *value;
g_return_if_fail (token != NULL);
switch (token->token_id) {
case ARV_EVALUATOR_TOKEN_VARIABLE:
value = g_hash_table_lookup (variables, token->data.name);
if (value != NULL && arv_value_holds_double (value))
arv_debug_evaluator ("(var) %s = %g (double)",
token->data.name,
arv_value_get_double (value));
else if (value != NULL && arv_value_holds_int64 (value))
arv_debug_evaluator ("(var) %s = 0x%016" G_GINT64_MODIFIER "x %" G_GINT64_FORMAT" (int64)",
token->data.name,
arv_value_get_int64 (value),
arv_value_get_int64 (value));
else
arv_debug_evaluator ("(var) %s not found", token->data.name);
break;
case ARV_EVALUATOR_TOKEN_CONSTANT_INT64:
arv_debug_evaluator ("(int64) %" G_GINT64_FORMAT, token->data.v_int64);
break;
case ARV_EVALUATOR_TOKEN_CONSTANT_DOUBLE:
arv_debug_evaluator ("(double) %g", token->data.v_double);
break;
default:
arv_debug_evaluator ("(operator) %s", arv_evaluator_token_infos[token->token_id].tag);
}
}
static gboolean
arv_evaluator_token_is_variable (ArvEvaluatorToken *token)
{
return (token != NULL &&
token->token_id == ARV_EVALUATOR_TOKEN_VARIABLE);
}
static gboolean
arv_evaluator_token_is_operand (ArvEvaluatorToken *token)
{
return (token != NULL &&
token->token_id > ARV_EVALUATOR_TOKEN_LEFT_PARENTHESIS);
}
static gboolean
arv_evaluator_token_is_operator (ArvEvaluatorToken *token)
{
return (token != NULL &&
token->token_id > ARV_EVALUATOR_TOKEN_UNKNOWN &&
token->token_id < ARV_EVALUATOR_TOKEN_RIGHT_PARENTHESIS);
}
static gboolean
arv_evaluator_token_is_comma (ArvEvaluatorToken *token)
{
return (token != NULL &&
token->token_id == ARV_EVALUATOR_TOKEN_COMMA);
}
static gboolean
arv_evaluator_token_is_left_parenthesis (ArvEvaluatorToken *token)
{
return (token != NULL &&
token->token_id == ARV_EVALUATOR_TOKEN_LEFT_PARENTHESIS);
}
static gboolean
arv_evaluator_token_is_right_parenthesis (ArvEvaluatorToken *token)
{
return (token != NULL &&
token->token_id == ARV_EVALUATOR_TOKEN_RIGHT_PARENTHESIS);
}
static gboolean
arv_evaluator_token_compare_precedence (ArvEvaluatorToken *a, ArvEvaluatorToken *b)
{
gint a_precedence;
gint b_precedence;
ArvEvaluatorTokenAssociativity a_associativity;
if (a == NULL || b == NULL ||
a->token_id >= G_N_ELEMENTS (arv_evaluator_token_infos) ||
b->token_id >= G_N_ELEMENTS (arv_evaluator_token_infos))
return FALSE;
a_precedence = arv_evaluator_token_infos[a->token_id].precedence;
b_precedence = arv_evaluator_token_infos[b->token_id].precedence;
a_associativity = arv_evaluator_token_infos[a->token_id].associativity;
return (((a_precedence <= b_precedence) &&
a_associativity == ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_LEFT_TO_RIGHT) ||
((a_precedence < b_precedence) &&
a_associativity == ARV_EVALUATOR_TOKEN_ASSOCIATIVITY_RIGHT_TO_LEFT));
}
static ArvEvaluatorToken *
arv_get_next_token (char **expression, gboolean previous_token_was_operand, gboolean previous_token_was_right_parenthesis)
{
ArvEvaluatorToken *token = NULL;
ArvEvaluatorTokenId token_id = ARV_EVALUATOR_TOKEN_UNKNOWN;
g_return_val_if_fail (expression != NULL && *expression != NULL, NULL);
arv_str_skip_spaces (expression);
if (**expression == '\0')
return NULL;
if (g_ascii_isdigit (**expression)) {
char *end;
gint64 v_int64;
double v_double;
ptrdiff_t length_int64;
ptrdiff_t length_double;
v_int64 = g_ascii_strtoll (*expression, &end, 0);
length_int64 = end - *expression;
end = *expression;
arv_str_parse_double (&end, &v_double);
length_double = end - *expression;
if (length_double > 0 || length_int64 > 0) {
if (length_double > length_int64) {
token = arv_evaluator_token_new_double (v_double);
*expression += length_double;
} else {
token = arv_evaluator_token_new_int64 (v_int64);
*expression += length_int64;
}
}
} else if (g_ascii_isalpha (**expression) || **expression=='_' || **expression=='.') {
char *end = *expression;
ptrdiff_t token_length;
while (g_ascii_isalnum (*end) || *end == '_' || *end == '.')
end++;
token_length = end - *expression;
if (token_length == 2) {
if (g_ascii_strncasecmp ("ln", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_LN;
else if (g_ascii_strncasecmp ("lg", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_LG;
} else if (token_length == 3) {
if (g_ascii_strncasecmp ("sin", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_SIN;
else if (g_ascii_strncasecmp ("cos", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_COS;
else if (g_ascii_strncasecmp ("sgn", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_SGN;
else if (g_ascii_strncasecmp ("neg", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_NEG;
else if (g_ascii_strncasecmp ("tan", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_TAN;
else if (g_ascii_strncasecmp ("abs", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_ABS;
else if (g_ascii_strncasecmp ("exp", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_EXP;
} else if (token_length == 4) {
if (g_ascii_strncasecmp ("atan", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_ATAN;
else if (g_ascii_strncasecmp ("sqrt", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_SQRT;
else if (g_ascii_strncasecmp ("ceil", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_CEIL;
else if (g_ascii_strncasecmp ("asin", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_ASIN;
else if (g_ascii_strncasecmp ("acos", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_ACOS;
} else if (token_length == 5) {
if (g_ascii_strncasecmp ("trunc", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_TRUNC;
else if (g_ascii_strncasecmp ("round", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_ROUND;
else if (g_ascii_strncasecmp ("floor", *expression, token_length) == 0)
token_id = ARV_EVALUATOR_TOKEN_FUNCTION_FLOOR;
}
if (token_id != ARV_EVALUATOR_TOKEN_UNKNOWN)
token = arv_evaluator_token_new (token_id);
else {
char *name = g_strndup (*expression, token_length);
token = arv_evaluator_token_new_variable (name);
g_free (name);
}
*expression = end;
} else {
switch (**expression) {
case '(': token_id = ARV_EVALUATOR_TOKEN_LEFT_PARENTHESIS; break;
case ')': token_id = ARV_EVALUATOR_TOKEN_RIGHT_PARENTHESIS; break;
case ',': token_id = ARV_EVALUATOR_TOKEN_COMMA; break;
case '?': token_id = ARV_EVALUATOR_TOKEN_TERNARY_QUESTION_MARK; break;
case ':': token_id = ARV_EVALUATOR_TOKEN_TERNARY_COLON; break;
case '+': if (previous_token_was_operand ||
previous_token_was_right_parenthesis)
token_id = ARV_EVALUATOR_TOKEN_ADDITION;
else
token_id = ARV_EVALUATOR_TOKEN_PLUS;
break;
case '-': if (previous_token_was_operand ||
previous_token_was_right_parenthesis)
token_id = ARV_EVALUATOR_TOKEN_SUBSTRACTION;
else
token_id = ARV_EVALUATOR_TOKEN_MINUS;
break;
case '*': if ((*expression)[1] == '*') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_POWER;
} else
token_id = ARV_EVALUATOR_TOKEN_MULTIPLICATION;
break;
case '/': token_id = ARV_EVALUATOR_TOKEN_DIVISION; break;
case '%': token_id = ARV_EVALUATOR_TOKEN_REMAINDER; break;
case '&': if ((*expression)[1] == '&') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_LOGICAL_AND;
} else
token_id = ARV_EVALUATOR_TOKEN_BITWISE_AND;
break;
case '|': if ((*expression)[1] == '|') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_LOGICAL_OR;
} else
token_id = ARV_EVALUATOR_TOKEN_BITWISE_OR;
break;
case '^': token_id = ARV_EVALUATOR_TOKEN_BITWISE_XOR; break;
case '~': token_id = ARV_EVALUATOR_TOKEN_BITWISE_NOT; break;
case '<': if ((*expression)[1] == '>') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_NOT_EQUAL;
} else if ((*expression)[1] == '<') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_SHIFT_LEFT;
} else if ((*expression)[1] == '=') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_LESS_OR_EQUAL;
} else
token_id = ARV_EVALUATOR_TOKEN_LESS;
break;
case '>': if ((*expression)[1] == '>') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_SHIFT_RIGHT;
} else if ((*expression)[1] == '=') {
(*expression)++;
token_id = ARV_EVALUATOR_TOKEN_GREATER_OR_EQUAL;
} else
token_id = ARV_EVALUATOR_TOKEN_GREATER;
break;
case '=': token_id = ARV_EVALUATOR_TOKEN_EQUAL; break;
}
if (token_id != ARV_EVALUATOR_TOKEN_UNKNOWN) {
(*expression)++;
token = arv_evaluator_token_new (token_id);
}
}
return token;
}
static double
round_with_precision (double x, gint64 precision)
{
double pow_multiplier = pow(10, precision);
return (round (x*pow_multiplier))/pow_multiplier;
}
static int
get_arguments_count(ArvEvaluatorValuesStackItem * stack, int current_index)
{
int arguments_count = 0;
int index = current_index;
int parenthesis_level = stack[index].parenthesis_level;
while ((index>=0) && (stack[index].parenthesis_level>=parenthesis_level)){
index--;
arguments_count++;
}
return arguments_count;
}
static ArvEvaluatorStatus
evaluate (GSList *token_stack, GHashTable *variables, gint64 *v_int64, double *v_double)
{
ArvEvaluatorToken *token;
ArvEvaluatorStatus status;
GSList *iter;
ArvEvaluatorValuesStackItem stack[ARV_EVALUATOR_STACK_SIZE];
ArvValue *value;
int index = -1;
gboolean integer_mode;
g_assert (v_int64 != NULL || v_double != NULL);
integer_mode = v_int64 != NULL;
for (iter = token_stack; iter != NULL; iter = iter->next) {
int actual_arguments_count;
token = iter->data;
if (index < (arv_evaluator_token_infos[token->token_id].n_args - 1)) {
status = ARV_EVALUATOR_STATUS_MISSING_ARGUMENTS;
goto CLEANUP;
}
if (arv_evaluator_token_infos[token->token_id].double_only && integer_mode) {
status = ARV_EVALUATOR_STATUS_INVALID_DOUBLE_FUNCTION;
goto CLEANUP;
}
if (index >= ARV_EVALUATOR_STACK_SIZE - 1) {
status = ARV_EVALUATOR_STATUS_STACK_OVERFLOW;
goto CLEANUP;
}
arv_evaluator_token_debug (token, variables);
actual_arguments_count = arv_evaluator_token_infos[token->token_id].n_args;
switch (token->token_id) {
case ARV_EVALUATOR_TOKEN_LOGICAL_AND:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) &&
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_LOGICAL_OR:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) ||
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_BITWISE_NOT:
arv_value_set_int64 (&stack[index].value,
~arv_value_get_int64 (&stack[index].value));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_BITWISE_AND:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) &
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_BITWISE_OR:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) |
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_BITWISE_XOR:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) ^
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_EQUAL:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) ==
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_int64 (&stack[index - 1].value,
arv_value_get_double (&stack[index-1].value) ==
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_NOT_EQUAL:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) !=
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_int64 (&stack[index - 1].value,
arv_value_get_double (&stack[index-1].value) !=
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_LESS_OR_EQUAL:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) <=
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_int64 (&stack[index - 1].value,
arv_value_get_double (&stack[index-1].value) <=
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_GREATER_OR_EQUAL:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) >=
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_int64 (&stack[index - 1].value,
arv_value_get_double (&stack[index-1].value) >=
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_LESS:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) <
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_int64 (&stack[index - 1].value,
arv_value_get_double (&stack[index-1].value) <
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_GREATER:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) >
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_int64 (&stack[index - 1].value,
arv_value_get_double (&stack[index-1].value) >
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_SHIFT_RIGHT:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) >>
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_SHIFT_LEFT:
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) <<
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_SUBSTRACTION:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) -
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_double (&stack[index-1].value,
arv_value_get_double (&stack[index-1].value) -
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_ADDITION:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) +
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_double (&stack[index-1].value,
arv_value_get_double (&stack[index-1].value) +
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_REMAINDER:
if (arv_value_get_int64 (&stack[index].value) == 0) {
status = ARV_EVALUATOR_STATUS_DIVISION_BY_ZERO;
goto CLEANUP;
}
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) %
arv_value_get_int64 (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_DIVISION:
if (integer_mode) {
if (arv_value_get_int64 (&stack[index].value) == 0) {
status = ARV_EVALUATOR_STATUS_DIVISION_BY_ZERO;
goto CLEANUP;
}
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) /
arv_value_get_int64 (&stack[index].value));
} else {
if (arv_value_get_double (&stack[index].value) == 0.0) {
status = ARV_EVALUATOR_STATUS_DIVISION_BY_ZERO;
goto CLEANUP;
}
arv_value_set_double (&stack[index-1].value,
arv_value_get_double (&stack[index-1].value) /
arv_value_get_double (&stack[index].value));
}
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_MULTIPLICATION:
if (integer_mode ||
(arv_value_holds_int64 (&stack[index-1].value) &&
arv_value_holds_int64 (&stack[index].value)))
arv_value_set_int64 (&stack[index-1].value,
arv_value_get_int64 (&stack[index-1].value) *
arv_value_get_int64 (&stack[index].value));
else
arv_value_set_double (&stack[index-1].value,
arv_value_get_double (&stack[index-1].value) *
arv_value_get_double (&stack[index].value));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_POWER:
if (integer_mode)
arv_value_set_int64 (&stack[index-1].value,
pow (arv_value_get_int64(&stack[index-1].value),
arv_value_get_int64(&stack[index].value)));
else
arv_value_set_double (&stack[index-1].value,
pow (arv_value_get_double(&stack[index-1].value),
arv_value_get_double(&stack[index].value)));
stack[index-1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_MINUS:
if (integer_mode || arv_value_holds_int64 (&stack[index].value))
arv_value_set_int64 (&stack[index].value,
-arv_value_get_int64 (&stack[index].value));
else
arv_value_set_double (&stack[index].value,
-arv_value_get_double (&stack[index].value));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_PLUS:
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_SIN:
arv_value_set_double (&stack[index].value, sin (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_COS:
arv_value_set_double (&stack[index].value, cos (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_SGN:
if (integer_mode || arv_value_holds_int64 (&stack[index].value)) {
gint64 int_value = arv_value_get_int64 (&stack[index].value);
if (int_value < 0)
arv_value_set_int64 (&stack[index].value, -1);
else if (int_value > 0)
arv_value_set_int64 (&stack[index].value, 1);
else
arv_value_set_int64 (&stack[index].value, 0);
} else {
double dbl_value = arv_value_get_double (&stack[index].value);
if (dbl_value < 0.0)
arv_value_set_int64 (&stack[index].value, -1);
else if (dbl_value > 0.0)
arv_value_set_int64 (&stack[index].value, 1);
else
arv_value_set_int64 (&stack[index].value, 0);
}
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_NEG:
if (integer_mode || arv_value_holds_int64 (&stack[index].value))
arv_value_set_int64 (&stack[index].value,
-arv_value_get_int64 (&stack[index].value));
else
arv_value_set_double (&stack[index].value,
-arv_value_get_double (&stack[index].value));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_ATAN:
arv_value_set_double (&stack[index].value, atan (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_TAN:
arv_value_set_double (&stack[index].value, tan (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_ABS:
if (arv_value_holds_double (&stack[index].value))
arv_value_set_double (&stack[index].value,
fabs (arv_value_get_double (&stack[index].value)));
else
arv_value_set_int64 (&stack[index].value,
llabs (arv_value_get_int64 (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_EXP:
arv_value_set_double (&stack[index].value, exp (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_LN:
arv_value_set_double (&stack[index].value, log (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_LG:
arv_value_set_double (&stack[index].value, log10 (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_SQRT:
arv_value_set_double (&stack[index].value, sqrt (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_TRUNC:
if (arv_value_get_double (&stack[index].value) > 0.0)
arv_value_set_double (&stack[index].value,
floor (arv_value_get_double (&stack[index].value)));
else
arv_value_set_double (&stack[index].value,
ceil (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_ROUND:
actual_arguments_count = get_arguments_count(stack, index);
if (actual_arguments_count==1) {
arv_value_set_double(&stack[index].value, round(arv_value_get_double(&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
} else if (actual_arguments_count==2) {
arv_value_set_double(&stack[index - 1].value,
round_with_precision(arv_value_get_double(&stack[index - 1].value),
arv_value_get_int64(&stack[index].value)));
stack[index - 1].parenthesis_level = token->parenthesis_level;
} else {
if (actual_arguments_count<1) {
status = ARV_EVALUATOR_STATUS_MISSING_ARGUMENTS;
} else {
status = ARV_EVALUATOR_STATUS_REMAINING_OPERANDS;
}
goto CLEANUP;
}
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_FLOOR:
arv_value_set_double (&stack[index].value, floor (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_CEIL:
arv_value_set_double (&stack[index].value, ceil (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_ASIN:
arv_value_set_double (&stack[index].value, asin (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_FUNCTION_ACOS:
arv_value_set_double (&stack[index].value, acos (arv_value_get_double (&stack[index].value)));
stack[index].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_CONSTANT_INT64:
arv_value_set_int64 (&stack[index+1].value, token->data.v_int64);
stack[index+1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_CONSTANT_DOUBLE:
if (integer_mode)
arv_value_set_int64 (&stack[index+1].value, token->data.v_double);
else
arv_value_set_double (&stack[index+1].value, token->data.v_double);
stack[index+1].parenthesis_level = token->parenthesis_level;
break;
case ARV_EVALUATOR_TOKEN_VARIABLE:
value = g_hash_table_lookup (variables, token->data.name);
if (value != NULL) {
arv_value_copy (&stack[index+1].value, value);
stack[index+1].parenthesis_level = token->parenthesis_level;
} else {
status = ARV_EVALUATOR_STATUS_UNKNOWN_VARIABLE;
goto CLEANUP;
}
break;
case ARV_EVALUATOR_TOKEN_TERNARY_COLON:
break;
case ARV_EVALUATOR_TOKEN_TERNARY_QUESTION_MARK:
if (arv_value_get_int64 (&stack[index-2].value) != 0) {
arv_value_copy(&stack[index - 2].value, &stack[index - 1].value);
stack[index - 2].parenthesis_level = stack[index - 1].parenthesis_level;
} else {
arv_value_copy(&stack[index - 2].value, &stack[index].value);
stack[index - 2].parenthesis_level = stack[index].parenthesis_level;
}
break;
default:
status = ARV_EVALUATOR_STATUS_UNKNOWN_OPERATOR;
goto CLEANUP;
break;
}
index = index - actual_arguments_count + 1;
}
if (index != 0) {
status = ARV_EVALUATOR_STATUS_REMAINING_OPERANDS;
goto CLEANUP;
}
if (v_double != NULL)
*v_double = arv_value_get_double (&stack[0].value);
if (v_int64 != NULL)
*v_int64 = arv_value_get_int64 (&stack[0].value);
if (arv_value_holds_int64 (&stack[0].value))
arv_debug_evaluator ("[Evaluator::evaluate] Result = (int64) %" G_GINT64_FORMAT, arv_value_get_int64 (&stack[0].value));
else
arv_debug_evaluator ("[Evaluator::evaluate] Result = (double) %g", arv_value_get_double (&stack[0].value));
return ARV_EVALUATOR_STATUS_SUCCESS;
CLEANUP:
if (v_double != NULL)
*v_double = 0.0;
if (v_int64 != NULL)
*v_int64 = 0.0;
return status;
}
typedef struct {
int count;
GSList *token_stack;
GSList *operator_stack;
GSList *garbage_stack;
gboolean in_sub_expression;
gboolean previous_token_was_operand;