source: cpp/frams/util/extvalue.cpp @ 242

// This file is a part of the Framsticks GDK.
// Copyright (C) 1999-2014  Maciej Komosinski and Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.framsticks.com/ for further information.

#include "extvalue.h"
#include <frams/param/param.h>
#include "sstringutils.h"
#include <ctype.h>
#include <frams/vm/classes/collectionobj.h>
#include <frams/vm/classes/3dobject.h>
#include <frams/vm/classes/genoobj.h>
#include <common/nonstd_math.h>
#include <common/Convert.h>

#ifndef NO_BARRIER
#include <frams/simul/barrier.h>
#include <common/threads.h>
#endif

#ifdef MULTITHREADED
#include <pthread.h>
//this lock only protects against ref.counter corruption caused by concurrent reads.
//read/write conficts and nonatomicity are handled by BarrierObject (at least in theory ;-))
static pthread_mutex_t extobject_ref_lock=PTHREAD_MUTEX_INITIALIZER;
#define REF_LOCK pthread_mutex_lock(&extobject_ref_lock)
#define REF_UNLOCK pthread_mutex_unlock(&extobject_ref_lock)
#else
#define REF_LOCK 
#define REF_UNLOCK 
#endif

void ExtObject::incref() const
{
if (subtype&1)
        {
        REF_LOCK;
        dbobject->refcount++;
        REF_UNLOCK;
        }
}

void ExtObject::decref() const
{
if (subtype&1)
        {
        REF_LOCK;
        bool destroy=!--dbobject->refcount;
        REF_UNLOCK;
        //another thread can now access the object while we are deleting it
        //but this is not a bug since we only guarantee read/read safety
        if (destroy) delete dbobject;
        }
}

bool ExtObject::makeUnique()
{
if (!(subtype&1)) return false;
if (dbobject->refcount==1) return false;
VectorObject* v=VectorObject::fromObject(*this,false);
if (v)
        {
        VectorObject* n=new VectorObject;
        n->data.setSize(n->data.size());
        for(int i=0;i<v->data.size();i++)
                {
                ExtValue *x=(ExtValue*)v->data(i);
                n->data.set(i,x?new ExtValue(*x):NULL);
                }
        operator=(n->makeObject());
        return true;
        }
return false;
}

void* ExtObject::getTarget(const char* classname, bool through_barrier, bool warn) const
{
if (!strcmp(interfaceName(),classname))
        return getTarget();
#ifndef NO_BARRIER
if (through_barrier)
        {
        BarrierObject *bo=BarrierObject::fromObject(*this);
        if (bo)
                return bo->getSourceObject().getTarget(classname,true,warn);
        }
#endif

if (warn)
        {
        FMprintf("ExtValue","getObjectTarget",FMLV_WARN,"%s object expected, %s found",classname,interfaceName());
        }

return NULL;
}


SString ExtObject::toString() const
{
if (isEmpty()) return SString("<empty object>");
Param tmp_param;
ParamInterface *p=getParamInterface(tmp_param);
int tostr=p->findId("toString");
if (tostr>=0)
        {
        return SString(p->getString(tostr));
        }
else
        {
        SString tmp("<");
        tmp+=p->getName();
        tmp+=SString::sprintf(" object at %p>",object?object:paraminterface);
        return tmp;
        }
}

THREAD_LOCAL_DEF(ExtObject::Serialization,ExtObject::serialization);

void ExtObject::Serialization::begin()
{
if (level==0)
        refs.clear();
level++;
}

int ExtObject::Serialization::add(const ExtObject &o)
{
if (o.isEmpty()) return -1;
for(int i=0;i<(int)refs.size();i++)
        {
        ExtObject& r=refs[i];
        if (r==o) return i;
        }
refs.push_back(o);
return -1;
}

void ExtObject::Serialization::replace(const ExtObject& o,const ExtObject& other)
{
if (o.isEmpty()) return;
for(int i=0;i<(int)refs.size();i++)
        {
        ExtObject& r=refs[i];
        if (r==o)
                {
                r=other;
                return;
                }
        }
}

void ExtObject::Serialization::remove(const ExtObject& o)
{
if (o.isEmpty()) return;
for(int i=0;i<(int)refs.size();i++)
        {
        ExtObject& r=refs[i];
        if (o==r) refs.erase(refs.begin()+i);
        }
}

const ExtObject* ExtObject::Serialization::get(int ref)
{
if (ref<0) return NULL;
if (ref>=(int)refs.size()) return NULL;
return &refs[ref];
}

void ExtObject::Serialization::end()
{
level--;
if (level==0)
        refs.clear();
}

SString ExtObject::serialize_inner() const
{
int ref=tlsGetRef(serialization).add(*this);
if (ref>=0)
        return SString::sprintf("^%d",ref);

if (isEmpty()) return SString();
VectorObject *vec=VectorObject::fromObject(*this,false);
if (vec)
        return vec->serialize();
DictionaryObject *dic=DictionaryObject::fromObject(*this,false);
if (dic)
        return dic->serialize();
Param tmp_param;
ParamInterface *p=getParamInterface(tmp_param);
int m=p->findId("toVector");
if (m<0) 
        m=p->findId("toDictionary");
if (m>=0)
        {
        ExtObject o(p->getObject(m));
        SString ret=SString(interfaceName())+o.serialize();
        return ret;
        }
m=p->findId("toString");
if (m>=0)
        {
        SString str=p->getString(m);
        sstringQuote(str);
        SString ret=SString(interfaceName())+"\""+str+"\"";
        return ret;
        }

tlsGetRef(serialization).remove(*this);//undo nonserializable reference
SString ret=interfaceName();
ret+=SString::sprintf("<%p>",object?object:paraminterface);
return ret;
}

SString ExtObject::serialize() const
{
tlsGetRef(serialization).begin();
SString ret=serialize_inner();
tlsGetRef(serialization).end();
return ret;
}

///////////////////////////////////////

SString ExtValue::typeDescription() const
{
switch(type)
        {
        case TInt: return SString("integer value");
        case TDouble: return SString("floating point value");
        case TString: return SString("text string");
        case TUnknown: return SString("null value");
        case TInvalid: return SString("invalid value");
        case TObj: return getObject().isEmpty()?SString("null"):(SString(getObject().interfaceName())+" object");
        }
return SString::empty();
}

void *ExtValue::getObjectTarget(const char* classname,bool warn) const
{
if (type!=TObj)
        {
        if (warn)
                {
                SString tmp=getString();
                if (tmp.len()>30) tmp=tmp.substr(0,30)+"...";
                if (type==TString) tmp=SString("\"")+tmp+SString("\"");
                FMprintf("ExtValue","getObjectTarget",FMLV_WARN,"%s object expected, %s found",classname,(const char*)tmp);
                }
        return NULL;
        }

return getObject().getTarget(classname,true,warn);
}

void ExtValue::set(const ExtValue& src)
{
switch(src.type)
        {
        case TString: sets(src.sdata()); break;
        case TInt: seti(src.idata()); break;
        case TDouble: setd(src.ddata()); break;
        case TObj: seto(src.odata()); break;
        default:type=src.type; break;
        }
}

void ExtValue::setEmpty()
{
switch(type)
        {
#ifdef EXTVALUEUNION
        case TString: sdata().~SString(); break;
        case TObj: odata().~ExtObject(); break;
#else
        case TString: delete s; break;
        case TObj: delete o; break;
#endif
        default:;
        }
type=TUnknown;
}

static long longsign(long x)
{
if (x<0) return -1;
if (x>0) return 1;
return 0;
}

static long compareNull(const ExtValue& v)
{
switch(v.type)
        {
        case TDouble: return v.getDouble()!=0.0;
        case TInt: return v.getInt()?1:0;
        case TString: return 1;
        default: return !v.isNull();
        }
}

long ExtValue::compare(const ExtValue& src) const
{
if (type==TUnknown)
        return compareNull(src);
else if (src.type==TUnknown)
        return compareNull(*this);
switch(type)
        {
        case TInt:
        {
        long t=src.getInt();
        if (idata()>0)
                {if (t>0) return longsign(idata()-t); else return +1;}
        else
                {if (t<=0) return longsign(idata()-t); else return -1;}
        }
        case TDouble:
                {
                double t=ddata()-src.getDouble();
                if (t<0) return -1;
                else if (t>0) return 1;
                return 0;
                }
        case TString:
        {
        SString t=src.getString();
        SString& t2=sdata();
        const char* s1=(const char*)t2;
        const char* s2=(const char*)t;
        return longsign(strcmp(s1,s2));
        }
        case TObj: 
        {
        if (src.type==TObj)
                return !(odata()==src.odata());
        return 1;
        }
        default:;
        }
return 1;
}

int ExtValue::operator==(const ExtValue& src) const
{
if (type!=src.type) return 0;
switch(type)
        {
        case TInt: return idata()==src.idata();
        case TDouble: return ddata()==src.ddata();
        case TString: return sdata()==src.sdata();
        case TObj: return odata()==src.odata();
        default:;
        }
return 1;
}

void ExtValue::operator+=(const ExtValue& src)
{
switch(type)
        {
        case TInt: idata()+=src.getInt(); break;
        case TDouble: ddata()+=src.getDouble(); break;
        case TString: sdata()+=src.getString(); break;
        case TObj:
                {
                VectorObject *vec=VectorObject::fromObject(getObject(),false);
                VectorObject *vec2=VectorObject::fromObject(src.getObject(),false);
                if (vec && vec2)
                        {
                        for(int i=0;i<vec2->data.size();i++)
                                {
                                ExtValue *s=(ExtValue*)vec2->data(i);
                                ExtValue *d=s?new ExtValue(*s):NULL;
                                vec->data+=d;
                                }
                        return;
                        }
                }
                //NO break;
        case TUnknown:
        case TInvalid:
                FMprintf("ExtValue","operator+=",FMLV_WARN,"Can't add %s to %s",(const char*)src.typeDescription(),(const char*)typeDescription());
        default:;
        }
}

void ExtValue::operator-=(const ExtValue& src)
{
switch(type)
        {
        case TInt: idata()-=src.getInt(); break;
        case TDouble: ddata()-=src.getDouble(); break;
        case TString: case TObj: case TUnknown: case TInvalid:
                FMprintf("ExtValue","operator-=",FMLV_WARN,"Can't subtract %s from %s",(const char*)src.typeDescription(),(const char*)typeDescription());
                break;
        default:;
        }
}

void ExtValue::operator*=(const ExtValue& src)
{
switch(type)
        {
        case TInt: idata()*=src.getInt(); break;
        case TDouble: ddata()*=src.getDouble(); break;
        case TString:
        {
        SString t;
        for(int n=src.getInt();n>0;n--)
                t+=getString();
        setString(t);
        break;
        }
        case TObj:
                {
                VectorObject *vec=VectorObject::fromObject(getObject(),false);
                if (vec)
                        {
                        int n=src.getInt();
                        int orig_size=vec->data.size();
                        if (n<=0)
                                {vec->clear();return;}
                        for(;n>1;n--)
                                {
                                for(int i=0;i<orig_size;i++)
                                        {
                                        ExtValue *s=(ExtValue*)vec->data(i);
                                        ExtValue *d=s?new ExtValue(*s):NULL;
                                        vec->data+=d;
                                        }
                                }
                        return;
                        }
                }
                //NO break;
        case TUnknown: case TInvalid:
                FMprintf("ExtValue","operator*=",FMLV_WARN,"Can't multiply %s by %s",(const char*)typeDescription(),(const char*)src.typeDescription());
                break;
        default:;
        }
}

#include <common/framsg.h>
/*#include "fpu_control.h"
#include <signal.h>

static int fpuexception;
void mathhandler(int sig)
{
printf("fpu exception!\n");
fpuexception=1;
signal(SIGFPE,SIG_IGN);
} */

void ExtValue::operator/=(const ExtValue& src)
{
switch(type)
        {
        case TInt:
        { int a=src.getInt();
//              idata()/=src.getInt();
        if (a) idata()/=a;
        else {FMprintf("ExtValue","divide",FMLV_CRITICAL,"%d/0",idata()); setInvalid();}
        }
                break;

        case TDouble:
                {
                double d=src.getDouble();
                if (d==0.0)
                        {
                        FMprintf("ExtValue","divide",FMLV_CRITICAL,"%s/0.0",(const char*)getString());
                        setInvalid();
                        }
                else
                        {
                        fpExceptDisable();
                        double tmp=ddata()/d;
                        if (!finite(tmp))
                                { FMprintf("ExtValue","divide",FMLV_CRITICAL,"overflow %s/%s",(const char*)getString(),(const char*)src.getString()); setInvalid(); }
                        else
                                ddata()=tmp;
                        // niby dobrze ale lepiej byloby to robic bardziej systematycznie a nie tylko w dzieleniu?
                        //if (isnan(ddata())) //http://www.digitalmars.com/d/archives/c++/Traping_divide_by_zero_5728.html
                        //        { FMprintf("ExtValue","divide",FMLV_ERROR,"not-a-number",(const char*)getString()); setInvalid(); }
                        fpExceptEnable();
                        }
                }
                break;

        case TString: case TObj: case TUnknown: case TInvalid:
                FMprintf("ExtValue","operator/=",FMLV_WARN,"Can't divide %s by %s",(const char*)typeDescription(),(const char*)src.typeDescription());
                break;

        default:;
        }
}

SString ExtValue::format(SString& fmt,const ExtValue **values,int count)
{
SString ret;
// "..........%.........%..........%........"
//  ^_cur     ^_next
//  ^^^^^^^^^^___sub
//
// "..........%.........%..........%........"
//            ^-cur     ^-next
//            ^^^^^^^^^^___sub
const char* begin=(const char*)fmt, *end=begin+fmt.len(), *curr=begin;
int type=0;

class Args
{
const ExtValue **values;
int count;
int arg;
public:
Args(const ExtValue **v,int c):values(v),count(c),arg(0) {}
bool finished() {return arg>=count;}
const ExtValue *getNext() {const ExtValue *ret=NULL; if ((arg<count)&&values[arg]) ret=values[arg]; arg++; return ret;}
};
Args args(values,count);

while(curr<end)
        {
        const char* next=strchr(curr,'%');
        if (!next) next=end; else if ((next==curr)&&(curr>begin))
                {next=strchr(next+1,'%'); if (!next) next=end;}
        type=0;
        if (curr>begin)
                {
                type=0;
                for(const char* t=curr;t<next;t++)
                        switch(*t)
                                {
                                case 'd': case 'x': case 'X': case 'u': case 'p': case 'c': type='d'; t=next; break;
                                case 'f': case 'g': case 'e': type='f'; t=next; break;
                                case 's': type='s'; t=next; break;
                                case 't': case 'T': type=*t; t=next; break;
                                case '%': if (t>begin) {type=*t; t=next;} break;
                                }
                }
        if (curr>begin) curr--;
        const ExtValue *a;
        if (args.finished() && (type!=0) && (type!='%'))
                {
                ret+=fmt.substr(curr-begin);
                break;
                }
        SString sub=fmt.substr(curr-begin,next-curr);
        switch(type)
                {
                case 'd': a=args.getNext(); ret+=SString::sprintf((const char*)sub,a?a->getInt():0); break;
                case 'f': a=args.getNext(); ret+=SString::sprintf((const char*)sub,a?a->getDouble():0); break;
                case 's': {a=args.getNext(); SString tmp; if (a) tmp=a->getString(); ret+=SString::sprintf((const char*)sub,(const char*)tmp);} break;
                case 't': case 'T':
                        {
                        a=args.getNext();
                        time_t ti=a?a->getInt():0;
                        struct tm tm=Convert::localtime(ti);
                        SString timtxt;
                        if (type=='T')
                                timtxt=SString::sprintf("%04d-%02d-%02d %02d:%02d:%02d",1900+tm.tm_year,1+tm.tm_mon,tm.tm_mday,tm.tm_hour,tm.tm_min,tm.tm_sec);
                        else
                                timtxt=Convert::asctime(tm).c_str();
                        ret+=timtxt;
                        ret+=sub.substr(2);
                        }
                        break;
                case '%': ret+='%'; ret+=sub.substr(2); break;
                case 0: ret+=sub; break;
                }
        curr=next+1;
        }
return ret;
}


void ExtValue::operator%=(const ExtValue& src)
{
switch(type)
        {
        case TInt: idata()=idata()%src.getInt(); break;
        case TDouble: ddata()=fmod(ddata(),src.getDouble()); break;

        case TString:
        {
        VectorObject *vec=VectorObject::fromObject(src.getObject(),false);
        if (vec)
                sdata()=format(sdata(),(const ExtValue**)&vec->data.getref(0),vec->data.size());
        else
                {const ExtValue *ptr=&src; sdata()=ExtValue::format(sdata(),&ptr,1);}
        }
        break;

        case TObj: case TUnknown: case TInvalid:
                FMprintf("ExtValue","operator%=",FMLV_WARN,"Can't apply modulo to %s",(const char*)typeDescription());

        default:;
        }
}

long ExtValue::getInt(const char* s)
{
if ((s[0]=='0')&&(s[1]=='x'))
        {
        long val;
        sscanf(s+2,"%lx",&val);
        return val;
        }
else
        {
        if (strchr(s,'e')||(strchr(s,'E')))
                return (long)atof(s);
        else
                return atol(s);
        }
}

double ExtValue::getDouble(const char* s)
{
if ((s[0]=='0')&&(s[1]=='x'))
        {
        long val;
        sscanf(s+2,"%lx",&val);
        return val;
        }
else
        return atof(s);
}

long ExtValue::getInt() const
{
switch(type)
        {
        case TInt: return idata();
        case TDouble: return (int)ddata();
        case TString: return getInt((const char*)sdata());
        case TObj:
                FMprintf("ExtValue","getInt",FMLV_WARN,"Getting integer value from object reference (%s)",(const char*)getString());
                return (long)odata().param;
        default:;
        }
return 0;
}

double ExtValue::getDouble() const
{
switch(type)
        {
        case TDouble: return ddata();
        case TInt: return (double)idata();
        case TString: return getDouble((const char*)sdata());
        case TObj:
                FMprintf("ExtValue","getDouble",FMLV_WARN,"Getting floating point value from object reference (%s)",(const char*)getString());
                return (double)(long)odata().param;
        default:;
        }
return 0.0;
}
SString ExtValue::getString() const
{
switch(type)
        {
        case TString: return sdata();
        case TInt: return SString::valueOf(idata());
        case TDouble: return SString::valueOf(ddata());
        case TObj: return odata().toString();
        case TInvalid:  return SString("invalid");
        default: return SString("null");
        }
}

const SString* ExtValue::getStringPtr() const
{
if (type==TString)
        return &sdata();
return NULL;
}

SString ExtValue::serialize() const
{
switch(type)
        {
        case TString:
                {
                SString q=sdata();
                sstringQuote(q);
                return SString("\"")+q+SString("\"");
                }
        case TInt:
                return SString::valueOf(idata());
        case TDouble:
                return SString::valueOf(ddata());
        case TObj:
                return odata().serialize();
        case TInvalid:
                return SString("invalid");
        default:
                return SString("null");
        }
}

//returns the first character after the parsed number or NULL if not a number
const char* ExtValue::parseNumber(const char* in)
{
if (isdigit(*in)||((*in=='-')&&(isdigit(in[1]))))
        {
        const char* p=in;
        if (*p=='-') p++;
        while(isdigit(*p)) p++;
        bool fp=false;
        if ((*p=='.') && isdigit(p[1]))
                {
                p++;
                while(isdigit(*p)) p++;
                fp=true;
                }
        if (((*p=='e')||(*p=='E')) && (isdigit(p[1]) || (((p[1]=='-') || (p[1]=='+')) && isdigit(p[2]))))
                {
                p++;
                if ((*p=='-')||(*p=='+')) p++;
                while(isdigit(*p)) p++;
                fp=true;
                }

        if (fp)
                {
                setDouble(atof(in));
                return p;
                }
        else
                {
                setInt(atol(in));
                return p;
                }
        }
return NULL;
}

PtrListTempl<ParamInterface*> &ExtValue::getDeserializableClasses()
{
static PtrListTempl<ParamInterface*> classes;
return classes;
}

ParamInterface *ExtValue::findDeserializableClass(const char* name)
{
FOREACH(ParamInterface*,cls,getDeserializableClasses())
        if (!strcmp(cls->getName(),name))
                return cls;
return NULL;
}

static const char* skipWord(const char* in)
{
while(isalpha(*in)||(*in=='_'))
        in++;
return in;
}

//returns the first character after the parsed portion or NULL if invalid format
const char* ExtValue::deserialize_inner(const char* in)
{
const char* ret=parseNumber(in);
if (ret)
        return ret;
else if (*in=='\"')
        {
        ret=skipQuoteString(in+1,NULL);
        SString s(in+1,ret-(in+1));
        sstringUnquote(s);
        setString(s);
        if (*ret=='\"')
                return ret+1;
        else
                return NULL;
        }
else if (*in=='[')
        {
        VectorObject *vec=new VectorObject;
        ExtObject o(&VectorObject::par,vec);
        tlsGetRef(ExtObject::serialization).add(o);
        const char* p=in+1;
        ExtValue tmp;
        while(*p)
                {
                if (*p==']') {p++;break;}
                ret=tmp.deserialize(p);
                if (ret)
                        {
                        vec->data+=new ExtValue(tmp);
                        p=ret;
                        if (*p==',') p++;
                        }
                else
                        {
                        p=NULL;
                        break;
                        }
                }
        setObject(o);
        return p;
        }
else if (*in=='{')
        {
        DictionaryObject *dic=new DictionaryObject;
        ExtObject o(&DictionaryObject::par,dic);
        tlsGetRef(ExtObject::serialization).add(o);
        const char* p=in+1;
        ExtValue args[2]/*={value,key}*/, dummy_ret;
        while(*p)
                {
                if (*p=='}') {p++;break;}
                ret=args[1].deserialize(p);
                if ((!ret)||(args[1].getType()!=TString)) {p=NULL;break;}
                p=ret;
                if (*p!=':') {p=NULL;break;}
                p++;
                ret=args[0].deserialize(p);
                if (!ret) {p=NULL;break;}
                p=ret;
                dic->p_set(args,&dummy_ret);
                if (*p==',') p++;
                }
        setObject(o);
        return p;
        }
else if (!strncmp(in,"null",4))
        {
        setEmpty();
        return in+4;
        }
else if (!strncmp(in,"invalid",9))
        {
        setInvalid();
        return in+9;
        }
else if (*in=='<')
        { //unserializable object
        setInvalid();
        while(*in)
                if (*in=='>')
                        return in+1;
                else in++;
        return in;
        }
else if (*in=='^')
        {
        in++;
        ExtValue ref;
        ret=ref.parseNumber(in);
        if (ret && (ref.getType()==TInt))
                {
                const ExtObject* o=tlsGetRef(ExtObject::serialization).get(ref.getInt());
                if (o)
                        {
                        setObject(*o);
                        return ret;
                        }
                }
        return NULL;
        }
else if ((ret=skipWord(in))&&(ret!=in))
        {
        SString clsname(in,ret-in);
        ExtValue tmp;
        ret=tmp.deserialize(ret);
        ParamInterface *cls=findDeserializableClass(clsname);
        if (cls && (tmp.getType()!=TUnknown) && (tmp.getType()!=TInvalid))
                {
                VectorObject *vec=VectorObject::fromObject(tmp.getObject(),false);
                if (vec)
                        {
                        int m=cls->findId("newFromVector");
                        if (m>=0)
                                {
                                cls->call(m,&tmp,this);
                                tlsGetRef(ExtObject::serialization).replace(tmp.getObject(),getObject());
                                return ret;
                                }
                        }
                DictionaryObject *dic=DictionaryObject::fromObject(tmp.getObject(),false);
                if (dic)
                        {
                        int m=cls->findId("newFromDictionary");
                        if (m>=0)
                                {
                                cls->call(m,&tmp,this);
                                tlsGetRef(ExtObject::serialization).replace(tmp.getObject(),getObject());
                                return ret;
                                }
                        }
                if (tmp.getType()==TString)
                        {
                        int m=cls->findId("newFromString");
                        if (m>=0)
                                {
                                cls->call(m,&tmp,this);
                                tlsGetRef(ExtObject::serialization).replace(tmp.getObject(),getObject());
                                return ret;
                                }
                        }
                tlsGetRef(ExtObject::serialization).remove(tmp.getObject());
                setEmpty();
                }
        setEmpty();
        FMprintf("ExtValue","deserialize",FMLV_WARN,"object of class \"%s\" could not be deserialized",(const char*)clsname);
        return ret;
        }
setEmpty();
return NULL;
}

const char* ExtValue::deserialize(const char* in)
{
tlsGetRef(ExtObject::serialization).begin();
const char* ret=deserialize_inner(in);
tlsGetRef(ExtObject::serialization).end();
return ret;
}

ExtObject ExtValue::getObject() const
{
if (type==TObj) return odata();
return ExtObject();
}

ExtValue ExtValue::getExtType()
{
if (getType()!=TObj) return ExtValue((long)getType());
ExtObject& o=odata();
return ExtValue(SString(o.isEmpty()?"":o.interfaceName()));
}

SString SString::valueOf(const ExtValue& v)
{
return v.getString();
}
SString SString::valueOf(const ExtObject& v)
{
return v.toString();
}