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/*
flext - C++ layer for Max/MSP and pd (pure data) externals
Copyright (c) 2001,2002 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
// Code for handling of object creation functions
#include "flext.h"
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#define ALIASDEL ','
#define ALIASSLASHES ":/\\"
#ifdef MAXMSP
#define ALIASSLASH ':'
#elif defined(NT)
#define ALIASSLASH '/'
#else
#define ALIASSLASH '/'
#endif
//! Extract space-delimited words from a string
static const char *extract(const char *name,int ix = 0)
{
static char tmp[1024];
const char *n = name;
const char *del = strchr(name,ALIASDEL);
if(del) {
if(ix < 0) {
char *t = tmp;
while(n < del && (isspace(*n) || strchr(ALIASSLASHES,*n))) ++n;
while(n < del && !isspace(*n)) {
char c = *(n++);
*(t++) = strchr(ALIASSLASHES,c)?ALIASSLASH:c;
}
while(*t == ALIASSLASH && t > tmp) --t;
*t = 0;
return tmp;
}
n = del+1;
}
while(*n && isspace(*n)) ++n;
for(int i = 0; n && *n; ++i) {
if(i == ix) {
char *t = tmp;
for(; *n && !isspace(*n); ++t,++n) *t = *n;
*t = 0;
return *tmp?tmp:NULL;
}
else {
while(*n && !isspace(*n)) ++n;
while(*n && isspace(*n)) ++n;
}
}
return NULL;
}
//! Check if object's name ends with a tilde
static bool chktilde(const char *objname)
{
// int stplen = strlen(setupfun);
bool tilde = true; //!strncmp(setupfun,"_tilde",6);
if((objname[strlen(objname)-1] == '~'?1:0)^(tilde?1:0)) {
if(tilde)
error("flext: %s (no trailing ~) is defined as a tilde object",objname);
else
error("flext::check_tilde: %s is no tilde object",objname);
return true;
}
else
return false;
}
// this class stands for one registered object
// it holds the class, type flags, constructor and destructor of the object and the creation arg types
// it will never be destroyed
class libobject {
public:
libobject(t_class *&cl,flext_obj *(*newf)(int,t_atom *),void (*freef)(flext_hdr *));
flext_obj *(*newfun)(int,t_atom *);
void (*freefun)(flext_hdr *c);
t_class *const &clss;
bool lib,dsp,attr;
int argc;
int *argv;
};
libobject::libobject(t_class *&cl,flext_obj *(*newf)(int,t_atom *),void (*freef)(flext_hdr *)):
clss(cl),newfun(newf),freefun(freef),argc(0),argv(NULL)
{}
// this class stands for one registered object name
// it holds a pointer to the respective object
// it will never be destroyed
class libname {
public:
libname(const t_symbol *n,libobject *o): name(n),obj(o),nxt(NULL) {}
const t_symbol *name;
libobject *obj;
static void add(libname *n);
static libname *find(const t_symbol *s);
protected:
libname *nxt;
void addrec(libname *n);
static libname *root;
};
void libname::addrec(libname *n) { if(nxt) nxt->addrec(n); else nxt = n; }
libname *libname::root = NULL;
void libname::add(libname *l) {
if(root) root->addrec(l);
else root = l;
}
libname *libname::find(const t_symbol *s) {
libname *l;
for(l = root; l; l = l->nxt)
if(s == l->name) break;
return l;
}
// for MAXMSP, the library is represented by a special object (class) registered at startup
// all objects in the library are clones of that library object - they share the same class
#ifdef MAXMSP
static t_class *lib_class = NULL;
static const t_symbol *lib_name = NULL;
#endif
void flext_obj::lib_init(const char *name,void setupfun(),bool attr)
{
#ifdef MAXMSP
lib_name = MakeSymbol(name);
::setup(
(t_messlist **)&lib_class,
(t_newmethod)obj_new,(t_method)obj_free,
sizeof(flext_hdr),NULL,A_GIMME,A_NULL);
#endif
process_attributes = attr;
setupfun();
}
void flext_obj::obj_add(bool lib,bool dsp,bool attr,const char *idname,const char *names,void setupfun(t_class *),flext_obj *(*newfun)(int,t_atom *),void (*freefun)(flext_hdr *),int argtp1,...)
{
// get first possible object name
const t_symbol *nsym = MakeSymbol(extract(names));
#ifdef _DEBUG
if(dsp) chktilde(GetString(nsym));
#endif
if(!lib) process_attributes = attr;
// set dynamic class pointer
t_class **cl =
#ifdef MAXMSP
lib?&lib_class:
#endif
new t_class *;
// register object class
#ifdef PD
*cl = ::class_new(
(t_symbol *)nsym,
(t_newmethod)obj_new,(t_method)obj_free,
sizeof(flext_hdr),0,A_GIMME,A_NULL);
#elif defined(MAXMSP)
if(!lib) {
::setup(
(t_messlist **)cl,
(t_newmethod)obj_new,(t_method)obj_free,
sizeof(flext_hdr),NULL,A_GIMME,A_NULL);
}
#endif
// make new dynamic object
libobject *lo = new libobject(*cl,newfun,freefun);
lo->lib = lib;
lo->dsp = dsp;
lo->attr = process_attributes;
// parse the argument type list and store it with the object
if(argtp1 == A_GIMME)
lo->argc = -1;
else {
int argtp,i;
va_list marker;
// parse a first time and count only
va_start(marker,argtp1);
for(argtp = argtp1; argtp != A_NULL; ++lo->argc) argtp = (int)va_arg(marker,int);
va_end(marker);
lo->argv = new int[lo->argc];
// now parse and store
va_start(marker,argtp1);
for(argtp = argtp1,i = 0; i < lo->argc; ++i) {
lo->argv[i] = argtp;
argtp = (int)va_arg(marker,int);
}
va_end(marker);
}
// make help reference
flext_obj::DefineHelp(lo->clss,idname,extract(names,-1),dsp);
for(int ix = 0; ; ++ix) {
// in this loop register all the possible aliases of the object
const char *c = ix?extract(names,ix):GetString(nsym);
if(!c || !*c) break;
// add to name list
libname *l = new libname(MakeSymbol(c),lo);
libname::add(l);
#ifdef PD
if(ix > 0)
// in PD the first name is already registered with class creation
::class_addcreator((t_newmethod)obj_new,(t_symbol *)l->name,A_GIMME,A_NULL);
#elif defined(MAXMSP)
if(ix > 0 || lib)
// in MaxMSP the first alias gets its name from the name of the object file,
// unless it is a library (then the name can be different)
::alias(const_cast<char *>(c));
#endif
}
// call class setup function
setupfun(lo->clss);
}
typedef flext_obj *(*libfun)(int,t_atom *);
flext_hdr *flext_obj::obj_new(const t_symbol *s,int _argc_,t_atom *argv)
{
flext_hdr *obj = NULL;
libname *l = libname::find(s);
if(l) {
bool ok = true;
t_atom args[FLEXT_MAXNEWARGS];
libobject *lo = l->obj;
int argc = _argc_;
if(lo->attr) {
argc = flext_base::CheckAttrib(argc,argv);
}
if(lo->argc >= 0) {
#ifdef _DEBUG
if(lo->argc > FLEXT_MAXNEWARGS) { ERRINTERNAL(); ok = false; }
#endif
if(argc == lo->argc) {
for(int i = 0; /*ok &&*/ i < lo->argc; ++i) {
switch(lo->argv[i]) {
#ifdef MAXMSP
case A_INT:
if(flext::IsInt(argv[i])) args[i] = argv[i];
else if(flext::IsFloat(argv[i])) flext::SetInt(args[i],(int)flext::GetFloat(argv[i]));
else ok = false;
break;
#endif
case A_FLOAT:
if(flext::IsInt(argv[i])) flext::SetFloat(args[i],(float)flext::GetInt(argv[i]));
else if(flext::IsFloat(argv[i])) args[i] = argv[i];
else ok = false;
break;
case A_SYMBOL:
if(flext::IsSymbol(argv[i])) args[i] = argv[i];
else ok = false;
break;
}
}
if(!ok)
post("%s: Creation arguments do not match",s->s_name);
}
else {
error("%s: %s creation arguments",s->s_name,argc < lo->argc?"Not enough":"Too many");
ok = false;
}
}
if(ok) {
#ifdef PD
obj = (flext_hdr *)::pd_new(lo->clss);
#elif defined(MAXMSP)
obj = (flext_hdr *)::newobject(lo->clss);
#endif
flext_obj::m_holder = obj;
flext_obj::m_holdname = l->name;
flext_obj::m_holdattr = lo->attr;
// get actual flext object (newfun calls "new flext_obj()")
if(lo->argc >= 0)
// for interpreted arguments
obj->data = lo->newfun(lo->argc,args);
else
obj->data = lo->newfun(argc,argv);
flext_obj::m_holder = NULL;
flext_obj::m_holdname = NULL;
flext_obj::m_holdattr = false;
bool ok = obj->data ||
// check constructor exit flag
obj->data->InitOk();
if(ok && lo->attr && argc < _argc_)
// set cmdline attributes (this is a flext_base function!)
ok = ((flext_base *)obj->data)->InitAttrib(_argc_-argc,argv+argc);
if(ok) // call virtual init function
ok = obj->data->Init();
if(!ok) {
// there was some init error, free object
lo->freefun(obj);
obj = NULL;
}
}
}
#ifdef _DEBUG
else
#ifdef MAXMSP
// in MaxMSP an object with the name of the library exists, even if not explicitely declared!
if(s != lib_name)
#endif
error("Class %s not found in library!",s->s_name);
#endif
return obj;
}
void flext_obj::obj_free(flext_hdr *hdr)
{
const t_symbol *name = hdr->data->thisNameSym();
libname *l = libname::find(name);
if(l) {
// call virtual exit function
hdr->data->Exit();
// now call object destructor and deallocate
l->obj->freefun(hdr);
}
#ifdef _DEBUG
else
#ifdef MAXMSP
// in MaxMSP an object with the name of the library exists, even if not explicitely declared!
if(name != lib_name)
#endif
error("Class %s not found in library!",name);
#endif
}
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