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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) IOhannes m zmölnig
*
* 1999:forum::für::umläute:2004
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
#include "zexy.h"
#ifdef HAVE_REGEX_H
# include <sys/types.h>
# include <regex.h>
# include <string.h>
#endif
# define NUM_REGMATCHES 10
/*
* regex : see whether a regular expression matches the given symbol
*/
/* ------------------------- regex ------------------------------- */
/* match a regular expression against a string */
static t_class *regex_class;
typedef struct _regex
{
t_object x_obj;
#ifdef HAVE_REGEX_H
regex_t *x_regexp;
int x_matchnum;
#endif
} t_regex;
#ifdef HAVE_REGEX_H
static char*regex_l2s(int *reslen, t_symbol*s, int argc, t_atom*argv)
{
char *result = 0;
int pos=0, i=0;
t_atom*ap;
int length=0;
if(reslen)*reslen=length;
/* 1st get the length of the symbol */
if(s)length+=strlen(s->s_name);
else length-=1;
length+=argc;
i=argc;
ap=argv;
while(i--){
char buffer[MAXPDSTRING];
int len=0;
if(A_SYMBOL==ap->a_type){
len=strlen(ap->a_w.w_symbol->s_name);
} else {
atom_string(ap, buffer, MAXPDSTRING);
len=strlen(buffer);
}
length+=len;
ap++;
}
if(length<=0)return(0);
result = (char*)getbytes((length+1)*sizeof(char));
if (s) {
char *buf = s->s_name;
strcpy(result+pos, buf);
pos+=strlen(buf);
if(i){
strcpy(result+pos, " ");
pos += 1;
}
}
ap=argv;
i=argc;
while(i--){
if(A_SYMBOL==ap->a_type){
strcpy(result+pos, ap->a_w.w_symbol->s_name);
pos+= strlen(ap->a_w.w_symbol->s_name);
} else {
char buffer[MAXPDSTRING];
atom_string(ap, buffer, MAXPDSTRING);
strcpy(result+pos, buffer);
pos += strlen(buffer);
}
ap++;
if(i){
strcpy(result+pos, " ");
pos++;
}
}
result[length]=0;
if(reslen)*reslen=length;
return result;
}
#endif
static void regex_regex(t_regex *x, t_symbol*s, int argc, t_atom*argv)
{
ZEXY_USEVAR(s);
#ifdef HAVE_REGEX_H
char*result=0;
int length=0;
int flags = 0;
flags |= REG_EXTENDED;
result=regex_l2s(&length, 0, argc, argv);
if(0==result || 0==length){
pd_error(x, "[regex]: no regular expression given");
return;
}
if(x->x_regexp){
regfree(x->x_regexp);
freebytes(x->x_regexp, sizeof(t_regex));
x->x_regexp=0;
}
x->x_regexp=(regex_t*)getbytes(sizeof(t_regex));
if(regcomp(x->x_regexp, result, flags)) {
pd_error(x, "[regex]: invalid regular expression: %s", result);
if(x->x_regexp)freebytes(x->x_regexp, sizeof(t_regex));
x->x_regexp=0;
}
if(result)freebytes(result, length);
#endif
}
static void regex_symbol(t_regex *x, t_symbol *s, int argc, t_atom*argv)
{
ZEXY_USEVAR(s);
#ifdef HAVE_REGEX_H
char*teststring=0;
int length=0;
int num_matches=x->x_matchnum;
regmatch_t*match=(regmatch_t*)getbytes(sizeof(regmatch_t)*num_matches);
t_atom*ap=(t_atom*)getbytes(sizeof(t_atom)*(1+2*num_matches));
int ap_length=0;
int err=0;
if(!x->x_regexp){
pd_error(x, "[regex]: no regular expression!");
goto cleanup;
}
teststring=regex_l2s(&length, 0, argc, argv);
if(!teststring||!length){
pd_error(x, "[regex]: cannot evaluate string");
goto cleanup;
}
err=regexec(x->x_regexp, teststring, num_matches, match, 0);
if(err) {
ap_length=1;
SETFLOAT(ap, 0.f);
} else {
int num_results=0;
int i=0;
t_atom*ap2=ap+1;
for(i=0; i<num_matches; i++){
if(match[i].rm_so!=-1){
if(i>0 && (match[i].rm_so==match[i-1].rm_so) && (match[i].rm_eo==match[i-1].rm_eo)){
} else {
SETFLOAT(ap2+0, match[i].rm_so);
SETFLOAT(ap2+1, match[i].rm_eo);
ap2+=2;
num_results++;
}
}
}
ap_length=1+2*num_results;
SETFLOAT(ap, num_results);
}
cleanup:
if(teststring)freebytes(teststring, length);
if(match)freebytes(match, sizeof(regmatch_t)*num_matches);
if(ap){
outlet_list(x->x_obj.ob_outlet, gensym("list"), ap_length, ap);
freebytes(ap, sizeof(t_atom)*(1+2*num_matches));
}
#endif
}
static void *regex_new(t_symbol *s, int argc, t_atom*argv)
{
t_regex *x = (t_regex *)pd_new(regex_class);
ZEXY_USEVAR(s);
outlet_new(&x->x_obj, 0);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("symbol"), gensym("regex"));
#ifdef HAVE_REGEX_H
x->x_regexp=0;
x->x_matchnum=NUM_REGMATCHES;
if(argc)regex_regex(x, gensym(""), argc, argv);
#else
error("[regex] non-functional: compiled without regex-support!");
#endif
return (x);
}
static void regex_free(t_regex *x)
{
#ifdef HAVE_REGEX_H
if(x->x_regexp) {
regfree(x->x_regexp);
freebytes(x->x_regexp, sizeof(t_regex));
x->x_regexp=0;
}
#endif
}
static void regex_help(t_regex*x)
{
post("\n%c regex\t\t:: test the input whether it matches a regular expression", HEARTSYMBOL);
}
void regex_setup(void)
{
regex_class = class_new(gensym("regex"), (t_newmethod)regex_new,
(t_method)regex_free, sizeof(t_regex), 0, A_GIMME, 0);
class_addlist (regex_class, regex_symbol);
class_addmethod (regex_class, (t_method)regex_regex, gensym("regex"), A_GIMME, 0);
class_addmethod(regex_class, (t_method)regex_help, gensym("help"), A_NULL);
class_sethelpsymbol(regex_class, gensym("zexy/regex"));
zexy_register("regex");
}
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