2002-08-26 00:19:50 +03:00
|
|
|
/*
|
|
|
|
* simple arithmetic expression evaluator
|
|
|
|
*
|
2006-10-28 23:18:18 +03:00
|
|
|
* Copyright (c) 2002-2006 Michael Niedermayer <michaelni@gmx.at>
|
2006-10-28 21:30:20 +03:00
|
|
|
* Copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
|
2002-08-26 00:19:50 +03:00
|
|
|
*
|
2006-10-07 18:30:46 +03:00
|
|
|
* This file is part of FFmpeg.
|
|
|
|
*
|
|
|
|
* FFmpeg is free software; you can redistribute it and/or
|
2002-08-26 00:19:50 +03:00
|
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
|
|
* License as published by the Free Software Foundation; either
|
2006-10-07 18:30:46 +03:00
|
|
|
* version 2.1 of the License, or (at your option) any later version.
|
2002-08-26 00:19:50 +03:00
|
|
|
*
|
2006-10-07 18:30:46 +03:00
|
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
2002-08-26 00:19:50 +03:00
|
|
|
* 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
|
2006-10-07 18:30:46 +03:00
|
|
|
* License along with FFmpeg; if not, write to the Free Software
|
2006-01-13 00:43:26 +02:00
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
2002-08-26 00:19:50 +03:00
|
|
|
*/
|
|
|
|
|
2003-03-06 13:32:04 +02:00
|
|
|
/**
|
|
|
|
* @file eval.c
|
|
|
|
* simple arithmetic expression evaluator.
|
|
|
|
*
|
2002-08-26 00:19:50 +03:00
|
|
|
* see http://joe.hotchkiss.com/programming/eval/eval.html
|
|
|
|
*/
|
|
|
|
|
2003-02-10 11:35:32 +02:00
|
|
|
#include "avcodec.h"
|
2006-10-27 19:42:16 +03:00
|
|
|
#include "eval.h"
|
2003-02-10 11:35:32 +02:00
|
|
|
|
2002-08-26 00:19:50 +03:00
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <math.h>
|
|
|
|
|
2002-08-26 01:54:43 +03:00
|
|
|
#ifndef NAN
|
2006-09-23 11:50:50 +03:00
|
|
|
#define NAN 0.0/0.0
|
2002-08-26 01:54:43 +03:00
|
|
|
#endif
|
|
|
|
|
2002-08-30 19:16:30 +03:00
|
|
|
#ifndef M_PI
|
|
|
|
#define M_PI 3.14159265358979323846
|
|
|
|
#endif
|
|
|
|
|
2002-08-26 00:19:50 +03:00
|
|
|
typedef struct Parser{
|
|
|
|
int stack_index;
|
|
|
|
char *s;
|
2008-12-14 14:24:50 +02:00
|
|
|
const double *const_value;
|
|
|
|
const char * const *const_name; // NULL terminated
|
2002-08-26 00:19:50 +03:00
|
|
|
double (**func1)(void *, double a); // NULL terminated
|
2003-02-10 11:35:32 +02:00
|
|
|
const char **func1_name; // NULL terminated
|
2002-08-26 00:19:50 +03:00
|
|
|
double (**func2)(void *, double a, double b); // NULL terminated
|
2008-12-14 14:24:50 +02:00
|
|
|
const char **func2_name; // NULL terminated
|
2002-08-26 00:19:50 +03:00
|
|
|
void *opaque;
|
2008-02-04 01:25:35 +02:00
|
|
|
const char **error;
|
2006-10-28 01:16:25 +03:00
|
|
|
#define VARS 10
|
|
|
|
double var[VARS];
|
2002-08-26 00:19:50 +03:00
|
|
|
} Parser;
|
|
|
|
|
2008-06-24 23:01:31 +03:00
|
|
|
static const int8_t si_prefixes['z' - 'E' + 1]={
|
2006-09-27 23:01:39 +03:00
|
|
|
['y'-'E']= -24,
|
|
|
|
['z'-'E']= -21,
|
|
|
|
['a'-'E']= -18,
|
|
|
|
['f'-'E']= -15,
|
|
|
|
['p'-'E']= -12,
|
|
|
|
['n'-'E']= - 9,
|
|
|
|
['u'-'E']= - 6,
|
|
|
|
['m'-'E']= - 3,
|
|
|
|
['c'-'E']= - 2,
|
|
|
|
['d'-'E']= - 1,
|
|
|
|
['h'-'E']= 2,
|
|
|
|
['k'-'E']= 3,
|
|
|
|
['K'-'E']= 3,
|
|
|
|
['M'-'E']= 6,
|
|
|
|
['G'-'E']= 9,
|
|
|
|
['T'-'E']= 12,
|
|
|
|
['P'-'E']= 15,
|
|
|
|
['E'-'E']= 18,
|
|
|
|
['Z'-'E']= 21,
|
|
|
|
['Y'-'E']= 24,
|
|
|
|
};
|
|
|
|
|
|
|
|
/** strtod() function extended with 'k', 'M', 'G', 'ki', 'Mi', 'Gi' and 'B'
|
|
|
|
* postfixes. This allows using f.e. kB, MiB, G and B as a postfix. This
|
|
|
|
* function assumes that the unit of numbers is bits not bytes.
|
|
|
|
*/
|
|
|
|
static double av_strtod(const char *name, char **tail) {
|
|
|
|
double d;
|
|
|
|
char *next;
|
|
|
|
d = strtod(name, &next);
|
|
|
|
/* if parsing succeeded, check for and interpret postfixes */
|
|
|
|
if (next!=name) {
|
|
|
|
|
|
|
|
if(*next >= 'E' && *next <= 'z'){
|
|
|
|
int e= si_prefixes[*next - 'E'];
|
|
|
|
if(e){
|
|
|
|
if(next[1] == 'i'){
|
|
|
|
d*= pow( 2, e/0.3);
|
|
|
|
next+=2;
|
|
|
|
}else{
|
|
|
|
d*= pow(10, e);
|
|
|
|
next++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if(*next=='B') {
|
|
|
|
d*=8;
|
2007-01-17 00:07:49 +02:00
|
|
|
next++;
|
2006-09-27 23:01:39 +03:00
|
|
|
}
|
|
|
|
}
|
|
|
|
/* if requested, fill in tail with the position after the last parsed
|
|
|
|
character */
|
|
|
|
if (tail)
|
|
|
|
*tail = next;
|
|
|
|
return d;
|
|
|
|
}
|
|
|
|
|
2003-02-10 11:35:32 +02:00
|
|
|
static int strmatch(const char *s, const char *prefix){
|
2002-08-26 00:19:50 +03:00
|
|
|
int i;
|
|
|
|
for(i=0; prefix[i]; i++){
|
|
|
|
if(prefix[i] != s[i]) return 0;
|
|
|
|
}
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
struct ff_expr_s {
|
|
|
|
enum {
|
|
|
|
e_value, e_const, e_func0, e_func1, e_func2,
|
2006-10-28 01:16:25 +03:00
|
|
|
e_squish, e_gauss, e_ld,
|
2006-10-27 19:42:16 +03:00
|
|
|
e_mod, e_max, e_min, e_eq, e_gt, e_gte,
|
|
|
|
e_pow, e_mul, e_div, e_add,
|
2006-10-28 01:35:55 +03:00
|
|
|
e_last, e_st, e_while,
|
2006-10-27 19:42:16 +03:00
|
|
|
} type;
|
|
|
|
double value; // is sign in other types
|
|
|
|
union {
|
|
|
|
int const_index;
|
|
|
|
double (*func0)(double);
|
|
|
|
double (*func1)(void *, double);
|
|
|
|
double (*func2)(void *, double, double);
|
|
|
|
} a;
|
|
|
|
AVEvalExpr * param[2];
|
|
|
|
};
|
|
|
|
|
|
|
|
static double eval_expr(Parser * p, AVEvalExpr * e) {
|
|
|
|
switch (e->type) {
|
|
|
|
case e_value: return e->value;
|
|
|
|
case e_const: return e->value * p->const_value[e->a.const_index];
|
|
|
|
case e_func0: return e->value * e->a.func0(eval_expr(p, e->param[0]));
|
|
|
|
case e_func1: return e->value * e->a.func1(p->opaque, eval_expr(p, e->param[0]));
|
|
|
|
case e_func2: return e->value * e->a.func2(p->opaque, eval_expr(p, e->param[0]), eval_expr(p, e->param[1]));
|
|
|
|
case e_squish: return 1/(1+exp(4*eval_expr(p, e->param[0])));
|
|
|
|
case e_gauss: { double d = eval_expr(p, e->param[0]); return exp(-d*d/2)/sqrt(2*M_PI); }
|
2007-02-25 12:27:12 +02:00
|
|
|
case e_ld: return e->value * p->var[av_clip(eval_expr(p, e->param[0]), 0, VARS-1)];
|
2006-10-28 01:35:55 +03:00
|
|
|
case e_while: {
|
2006-10-28 10:03:24 +03:00
|
|
|
double d = NAN;
|
2006-10-28 01:35:55 +03:00
|
|
|
while(eval_expr(p, e->param[0]))
|
|
|
|
d=eval_expr(p, e->param[1]);
|
|
|
|
return d;
|
|
|
|
}
|
2006-10-27 19:42:16 +03:00
|
|
|
default: {
|
|
|
|
double d = eval_expr(p, e->param[0]);
|
|
|
|
double d2 = eval_expr(p, e->param[1]);
|
|
|
|
switch (e->type) {
|
|
|
|
case e_mod: return e->value * (d - floor(d/d2)*d2);
|
|
|
|
case e_max: return e->value * (d > d2 ? d : d2);
|
|
|
|
case e_min: return e->value * (d < d2 ? d : d2);
|
|
|
|
case e_eq: return e->value * (d == d2 ? 1.0 : 0.0);
|
|
|
|
case e_gt: return e->value * (d > d2 ? 1.0 : 0.0);
|
|
|
|
case e_gte: return e->value * (d >= d2 ? 1.0 : 0.0);
|
|
|
|
case e_pow: return e->value * pow(d, d2);
|
|
|
|
case e_mul: return e->value * (d * d2);
|
|
|
|
case e_div: return e->value * (d / d2);
|
|
|
|
case e_add: return e->value * (d + d2);
|
2006-10-28 11:03:30 +03:00
|
|
|
case e_last:return e->value * d2;
|
2007-02-25 12:27:12 +02:00
|
|
|
case e_st : return e->value * (p->var[av_clip(d, 0, VARS-1)]= d2);
|
2006-10-27 19:42:16 +03:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return NAN;
|
|
|
|
}
|
|
|
|
|
|
|
|
static AVEvalExpr * parse_expr(Parser *p);
|
|
|
|
|
|
|
|
void ff_eval_free(AVEvalExpr * e) {
|
|
|
|
if (!e) return;
|
|
|
|
ff_eval_free(e->param[0]);
|
|
|
|
ff_eval_free(e->param[1]);
|
|
|
|
av_freep(&e);
|
|
|
|
}
|
|
|
|
|
|
|
|
static AVEvalExpr * parse_primary(Parser *p) {
|
|
|
|
AVEvalExpr * d = av_mallocz(sizeof(AVEvalExpr));
|
2002-08-26 00:19:50 +03:00
|
|
|
char *next= p->s;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
/* number */
|
2006-10-27 19:42:16 +03:00
|
|
|
d->value = av_strtod(p->s, &next);
|
2002-08-26 00:19:50 +03:00
|
|
|
if(next != p->s){
|
2006-10-27 19:42:16 +03:00
|
|
|
d->type = e_value;
|
2002-08-26 00:19:50 +03:00
|
|
|
p->s= next;
|
2005-01-15 22:04:41 +02:00
|
|
|
return d;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
2006-10-27 19:42:16 +03:00
|
|
|
d->value = 1;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2002-08-26 00:19:50 +03:00
|
|
|
/* named constants */
|
2005-01-15 21:05:26 +02:00
|
|
|
for(i=0; p->const_name && p->const_name[i]; i++){
|
2002-08-26 00:19:50 +03:00
|
|
|
if(strmatch(p->s, p->const_name[i])){
|
|
|
|
p->s+= strlen(p->const_name[i]);
|
2006-10-27 19:42:16 +03:00
|
|
|
d->type = e_const;
|
|
|
|
d->a.const_index = i;
|
|
|
|
return d;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
}
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2002-08-26 00:19:50 +03:00
|
|
|
p->s= strchr(p->s, '(');
|
|
|
|
if(p->s==NULL){
|
2008-05-21 20:50:42 +03:00
|
|
|
*p->error = "undefined constant or missing (";
|
2006-09-24 13:38:14 +03:00
|
|
|
p->s= next;
|
2006-10-27 19:42:16 +03:00
|
|
|
ff_eval_free(d);
|
|
|
|
return NULL;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
p->s++; // "("
|
2006-10-27 19:42:16 +03:00
|
|
|
if (*next == '(') { // special case do-nothing
|
|
|
|
av_freep(&d);
|
|
|
|
d = parse_expr(p);
|
|
|
|
if(p->s[0] != ')'){
|
|
|
|
*p->error = "missing )";
|
|
|
|
ff_eval_free(d);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
p->s++; // ")"
|
|
|
|
return d;
|
|
|
|
}
|
|
|
|
d->param[0] = parse_expr(p);
|
2004-02-18 14:49:30 +02:00
|
|
|
if(p->s[0]== ','){
|
|
|
|
p->s++; // ","
|
2006-10-27 19:42:16 +03:00
|
|
|
d->param[1] = parse_expr(p);
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
2004-02-18 14:49:30 +02:00
|
|
|
if(p->s[0] != ')'){
|
2006-09-27 01:01:33 +03:00
|
|
|
*p->error = "missing )";
|
2006-10-27 19:42:16 +03:00
|
|
|
ff_eval_free(d);
|
|
|
|
return NULL;
|
2004-02-18 14:49:30 +02:00
|
|
|
}
|
|
|
|
p->s++; // ")"
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
d->type = e_func0;
|
|
|
|
if( strmatch(next, "sinh" ) ) d->a.func0 = sinh;
|
|
|
|
else if( strmatch(next, "cosh" ) ) d->a.func0 = cosh;
|
|
|
|
else if( strmatch(next, "tanh" ) ) d->a.func0 = tanh;
|
|
|
|
else if( strmatch(next, "sin" ) ) d->a.func0 = sin;
|
|
|
|
else if( strmatch(next, "cos" ) ) d->a.func0 = cos;
|
|
|
|
else if( strmatch(next, "tan" ) ) d->a.func0 = tan;
|
|
|
|
else if( strmatch(next, "atan" ) ) d->a.func0 = atan;
|
|
|
|
else if( strmatch(next, "asin" ) ) d->a.func0 = asin;
|
|
|
|
else if( strmatch(next, "acos" ) ) d->a.func0 = acos;
|
|
|
|
else if( strmatch(next, "exp" ) ) d->a.func0 = exp;
|
|
|
|
else if( strmatch(next, "log" ) ) d->a.func0 = log;
|
|
|
|
else if( strmatch(next, "abs" ) ) d->a.func0 = fabs;
|
|
|
|
else if( strmatch(next, "squish") ) d->type = e_squish;
|
|
|
|
else if( strmatch(next, "gauss" ) ) d->type = e_gauss;
|
|
|
|
else if( strmatch(next, "mod" ) ) d->type = e_mod;
|
|
|
|
else if( strmatch(next, "max" ) ) d->type = e_max;
|
|
|
|
else if( strmatch(next, "min" ) ) d->type = e_min;
|
|
|
|
else if( strmatch(next, "eq" ) ) d->type = e_eq;
|
|
|
|
else if( strmatch(next, "gte" ) ) d->type = e_gte;
|
2006-10-28 00:37:47 +03:00
|
|
|
else if( strmatch(next, "gt" ) ) d->type = e_gt;
|
2006-10-27 19:42:16 +03:00
|
|
|
else if( strmatch(next, "lte" ) ) { AVEvalExpr * tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gt; }
|
2006-10-28 00:37:47 +03:00
|
|
|
else if( strmatch(next, "lt" ) ) { AVEvalExpr * tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gte; }
|
2006-10-28 01:16:25 +03:00
|
|
|
else if( strmatch(next, "ld" ) ) d->type = e_ld;
|
|
|
|
else if( strmatch(next, "st" ) ) d->type = e_st;
|
2006-10-28 01:35:55 +03:00
|
|
|
else if( strmatch(next, "while" ) ) d->type = e_while;
|
2006-10-27 19:42:16 +03:00
|
|
|
else {
|
2002-08-26 00:19:50 +03:00
|
|
|
for(i=0; p->func1_name && p->func1_name[i]; i++){
|
|
|
|
if(strmatch(next, p->func1_name[i])){
|
2006-10-27 19:42:16 +03:00
|
|
|
d->a.func1 = p->func1[i];
|
|
|
|
d->type = e_func1;
|
|
|
|
return d;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
for(i=0; p->func2_name && p->func2_name[i]; i++){
|
|
|
|
if(strmatch(next, p->func2_name[i])){
|
2006-10-27 19:42:16 +03:00
|
|
|
d->a.func2 = p->func2[i];
|
|
|
|
d->type = e_func2;
|
|
|
|
return d;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-09-27 01:01:33 +03:00
|
|
|
*p->error = "unknown function";
|
2006-10-27 19:42:16 +03:00
|
|
|
ff_eval_free(d);
|
|
|
|
return NULL;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
2005-01-15 21:05:26 +02:00
|
|
|
|
2005-01-15 22:04:41 +02:00
|
|
|
return d;
|
2005-12-17 20:14:38 +02:00
|
|
|
}
|
2005-01-17 20:25:32 +02:00
|
|
|
|
2006-10-27 23:38:10 +03:00
|
|
|
static AVEvalExpr * new_eval_expr(int type, int value, AVEvalExpr *p0, AVEvalExpr *p1){
|
|
|
|
AVEvalExpr * e = av_mallocz(sizeof(AVEvalExpr));
|
|
|
|
e->type =type ;
|
|
|
|
e->value =value ;
|
|
|
|
e->param[0] =p0 ;
|
|
|
|
e->param[1] =p1 ;
|
|
|
|
return e;
|
|
|
|
}
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
static AVEvalExpr * parse_pow(Parser *p, int *sign){
|
2006-10-16 22:06:56 +03:00
|
|
|
*sign= (*p->s == '+') - (*p->s == '-');
|
|
|
|
p->s += *sign&1;
|
2006-10-27 19:42:16 +03:00
|
|
|
return parse_primary(p);
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
static AVEvalExpr * parse_factor(Parser *p){
|
2006-10-16 22:06:56 +03:00
|
|
|
int sign, sign2;
|
2006-10-27 19:42:16 +03:00
|
|
|
AVEvalExpr * e = parse_pow(p, &sign);
|
2002-08-26 00:19:50 +03:00
|
|
|
while(p->s[0]=='^'){
|
|
|
|
p->s++;
|
2006-10-28 00:13:31 +03:00
|
|
|
e= new_eval_expr(e_pow, 1, e, parse_pow(p, &sign2));
|
|
|
|
if (e->param[1]) e->param[1]->value *= (sign2|1);
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
2006-10-27 19:42:16 +03:00
|
|
|
if (e) e->value *= (sign|1);
|
|
|
|
return e;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
static AVEvalExpr * parse_term(Parser *p){
|
|
|
|
AVEvalExpr * e = parse_factor(p);
|
2002-08-26 00:19:50 +03:00
|
|
|
while(p->s[0]=='*' || p->s[0]=='/'){
|
2006-10-27 23:38:10 +03:00
|
|
|
int c= *p->s++;
|
|
|
|
e= new_eval_expr(c == '*' ? e_mul : e_div, 1, e, parse_factor(p));
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
2006-10-27 19:42:16 +03:00
|
|
|
return e;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
|
2006-10-28 01:16:25 +03:00
|
|
|
static AVEvalExpr * parse_subexpr(Parser *p) {
|
|
|
|
AVEvalExpr * e = parse_term(p);
|
|
|
|
while(*p->s == '+' || *p->s == '-') {
|
|
|
|
e= new_eval_expr(e_add, 1, e, parse_term(p));
|
|
|
|
};
|
|
|
|
|
|
|
|
return e;
|
|
|
|
}
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
static AVEvalExpr * parse_expr(Parser *p) {
|
|
|
|
AVEvalExpr * e;
|
2002-08-26 00:19:50 +03:00
|
|
|
|
2005-01-15 22:04:41 +02:00
|
|
|
if(p->stack_index <= 0) //protect against stack overflows
|
2006-10-27 19:42:16 +03:00
|
|
|
return NULL;
|
2005-01-15 22:04:41 +02:00
|
|
|
p->stack_index--;
|
|
|
|
|
2006-10-28 01:16:25 +03:00
|
|
|
e = parse_subexpr(p);
|
2006-10-27 19:42:16 +03:00
|
|
|
|
2006-10-28 01:16:25 +03:00
|
|
|
while(*p->s == ';') {
|
|
|
|
p->s++;
|
|
|
|
e= new_eval_expr(e_last, 1, e, parse_subexpr(p));
|
2006-10-27 19:42:16 +03:00
|
|
|
};
|
2005-01-15 22:04:41 +02:00
|
|
|
|
|
|
|
p->stack_index++;
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
return e;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
static int verify_expr(AVEvalExpr * e) {
|
|
|
|
if (!e) return 0;
|
|
|
|
switch (e->type) {
|
|
|
|
case e_value:
|
|
|
|
case e_const: return 1;
|
|
|
|
case e_func0:
|
|
|
|
case e_func1:
|
|
|
|
case e_squish:
|
2006-10-28 01:16:25 +03:00
|
|
|
case e_ld:
|
2006-10-27 19:42:16 +03:00
|
|
|
case e_gauss: return verify_expr(e->param[0]);
|
|
|
|
default: return verify_expr(e->param[0]) && verify_expr(e->param[1]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-12-14 14:24:50 +02:00
|
|
|
AVEvalExpr * ff_parse(const char *s, const char * const *const_name,
|
2003-02-10 11:35:32 +02:00
|
|
|
double (**func1)(void *, double), const char **func1_name,
|
2008-12-14 14:24:50 +02:00
|
|
|
double (**func2)(void *, double, double), const char **func2_name,
|
2008-02-04 01:25:35 +02:00
|
|
|
const char **error){
|
2002-08-26 00:19:50 +03:00
|
|
|
Parser p;
|
2006-10-27 19:42:16 +03:00
|
|
|
AVEvalExpr * e;
|
2006-10-28 12:49:13 +03:00
|
|
|
char w[strlen(s) + 1], * wp = w;
|
|
|
|
|
|
|
|
while (*s)
|
|
|
|
if (!isspace(*s++)) *wp++ = s[-1];
|
|
|
|
*wp++ = 0;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2005-01-15 22:04:41 +02:00
|
|
|
p.stack_index=100;
|
2006-10-28 12:49:13 +03:00
|
|
|
p.s= w;
|
2002-08-26 00:19:50 +03:00
|
|
|
p.const_name = const_name;
|
|
|
|
p.func1 = func1;
|
|
|
|
p.func1_name = func1_name;
|
|
|
|
p.func2 = func2;
|
|
|
|
p.func2_name = func2_name;
|
2006-09-27 01:01:33 +03:00
|
|
|
p.error= error;
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2006-10-27 19:42:16 +03:00
|
|
|
e = parse_expr(&p);
|
|
|
|
if (!verify_expr(e)) {
|
|
|
|
ff_eval_free(e);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
return e;
|
|
|
|
}
|
|
|
|
|
2008-12-14 14:24:50 +02:00
|
|
|
double ff_parse_eval(AVEvalExpr * e, const double *const_value, void *opaque) {
|
2006-10-27 19:42:16 +03:00
|
|
|
Parser p;
|
|
|
|
|
|
|
|
p.const_value= const_value;
|
|
|
|
p.opaque = opaque;
|
|
|
|
return eval_expr(&p, e);
|
|
|
|
}
|
|
|
|
|
2008-12-14 14:24:50 +02:00
|
|
|
double ff_eval2(const char *s, const double *const_value, const char * const *const_name,
|
2006-10-27 19:42:16 +03:00
|
|
|
double (**func1)(void *, double), const char **func1_name,
|
2008-12-14 14:24:50 +02:00
|
|
|
double (**func2)(void *, double, double), const char **func2_name,
|
2008-02-04 01:25:35 +02:00
|
|
|
void *opaque, const char **error){
|
2006-10-27 19:42:16 +03:00
|
|
|
AVEvalExpr * e = ff_parse(s, const_name, func1, func1_name, func2, func2_name, error);
|
|
|
|
double d;
|
|
|
|
if (!e) return NAN;
|
|
|
|
d = ff_parse_eval(e, const_value, opaque);
|
|
|
|
ff_eval_free(e);
|
|
|
|
return d;
|
2002-08-26 00:19:50 +03:00
|
|
|
}
|
2005-01-15 21:05:26 +02:00
|
|
|
|
|
|
|
#ifdef TEST
|
2005-12-17 20:14:38 +02:00
|
|
|
#undef printf
|
2005-01-15 21:05:26 +02:00
|
|
|
static double const_values[]={
|
|
|
|
M_PI,
|
|
|
|
M_E,
|
|
|
|
0
|
|
|
|
};
|
|
|
|
static const char *const_names[]={
|
|
|
|
"PI",
|
|
|
|
"E",
|
|
|
|
0
|
|
|
|
};
|
2008-01-22 11:20:25 +02:00
|
|
|
int main(void){
|
2005-01-17 20:25:32 +02:00
|
|
|
int i;
|
2008-11-05 15:32:06 +02:00
|
|
|
printf("%f == 12.7\n", ff_eval2("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_values, const_names, NULL, NULL, NULL, NULL, NULL, NULL));
|
|
|
|
printf("%f == 0.931322575\n", ff_eval2("80G/80Gi", const_values, const_names, NULL, NULL, NULL, NULL, NULL, NULL));
|
2005-12-17 20:14:38 +02:00
|
|
|
|
2005-01-17 20:25:32 +02:00
|
|
|
for(i=0; i<1050; i++){
|
|
|
|
START_TIMER
|
2008-11-05 15:32:06 +02:00
|
|
|
ff_eval2("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_values, const_names, NULL, NULL, NULL, NULL, NULL, NULL);
|
|
|
|
STOP_TIMER("ff_eval2")
|
2005-01-17 20:25:32 +02:00
|
|
|
}
|
2008-01-22 11:20:25 +02:00
|
|
|
return 0;
|
2005-01-15 21:05:26 +02:00
|
|
|
}
|
|
|
|
#endif
|