source: cpp/frams/util/extvalue.cpp @ 411

// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 1999-2015  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#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>
#include <climits>
#include <errno.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::operator==(const ExtObject& src) const
{
        if (object != src.object) return false;
        const char* n1 = interfaceName();
        const char* n2 = src.interfaceName();
        return (n1 == n2) || (strcmp(n1, n2) == 0);
}

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)
        {
                logPrintf("ExtValue", "getObjectTarget", LOG_WARN, "%s object expected, %s found", classname, interfaceName());
        }

        return NULL;
}


SString ExtObject::toString() const
{
        if (isEmpty()) return SString("null");
        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(ExtObject_serialization).add(*this);
        if (ref >= 0)
                return SString::sprintf("^%d", ref);

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

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

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

SString ExtValue::typeDescription() const
{
        switch (type)
        {
        case TInt: return SString("int");
        case TDouble: return SString("float");
        case TString: return SString("string");
        case TUnknown: return SString("null");
        case TInvalid: return SString("invalid");
        case TObj: return getObject().isEmpty() ? SString("null") : SString(getObject().interfaceName());
        }
        return SString::empty();
}

SString ExtValue::typeAndValue() const
{
        SString msg = typeDescription();
        switch (type)
        {
        case TInt: case TDouble: case TString: case TObj:
                msg += " '";
                msg += getString();
                msg += "'";
        default:;
        }
        return msg;
}

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("\"");
                        logPrintf("ExtValue", "getObjectTarget", LOG_WARN, "%s object expected, %s found", classname, tmp.c_str());
                }
                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 ExtValue::CompareResult longsign(paInt x)
{
        if (x < 0) return ExtValue::ResultLower;
        if (x > 0) return ExtValue::ResultHigher;
        return ExtValue::ResultEqual;
}

static ExtValue::CompareResult compareNull(const ExtValue& v)
{
        if (v.isNull()) return ExtValue::ResultEqualUnordered;
        if ((v.getType() == TInt) && (v.getInt() == 0)) return ExtValue::ResultUnequal_RelaxedEqual;
        return ExtValue::ResultUnequal_RelaxedUnequal; //comparing anything else with null is valid but null is neither higher nor lower than numbers or strings
}

static ExtValue::CompareResult compareFloat(double a, double b)
{
        double t = a - b;
        if (t < 0) return ExtValue::ResultLower;
        else if (t > 0) return ExtValue::ResultHigher;
        return ExtValue::ResultEqual;
}

static ExtValue::CompareResult compareString(const SString &a, const SString &b)
{
        const char* s1 = a.c_str();
        const char* s2 = b.c_str();
        return longsign(strcmp(s1, s2));
}

ExtValue::CompareResult ExtValue::compare(const ExtValue& src) const
{
        if (isNull())
                return compareNull(src);
        else if (src.isNull())
                return compareNull(*this);
        switch (type)
        {

        case TInt:

                if (src.getType() == TInt)
                {
                        paInt t = src.getInt();
                        if (idata() > 0)
                        {
                                if (t > 0) return longsign(idata() - t); else return ResultHigher;
                        }
                        else
                        {
                                if (t <= 0) return longsign(idata() - t); else return ResultLower;
                        }
                }
                else if (src.getType() == TDouble)
                        return compareFloat((double)idata(), src.getDouble());
                else
                        return ResultMismatch;//comparing numbers with other things is invalid
                break;

        case TDouble:
                if ((src.getType() == TDouble) || (src.getType() == TInt))
                        return compareFloat(getDouble(), src.getDouble());
                else
                        return ResultMismatch;
                break;

        case TString:
                if (src.getType() == TString)
                        return compareString(sdata(), src.getString());
                else
                        return ResultMismatch;
                break;

        case TObj:
        {
                if (src.type == TObj)
                        return odata() == src.odata() ? ResultEqualUnordered : ResultUnequal_RelaxedUnequal;
                if ((src.type == TInt) && (src.getInt() == 0))
                        return ResultMismatch_RelaxedUnequal;
                return ResultMismatch;
        }
        default:;
        }
        return ResultMismatch;
}

const char* ExtValue::cmp_op_names[] = { "==", "!=", ">=", "<=", ">", "<", "~=", "!~", NULL };

int ExtValue::interpretCompare(CmpOperator op, CompareResult result, CmpContext *context)
{
        CompareResult error_threshold = ResultUnequal_RelaxedEqual;//error when ResultUnequal_RelaxedEqual or higher (not comparable)
        int ret = 0;
        switch (op)
        {
        case CmpEQ: ret = (result == ResultEqual) || (result == ResultEqualUnordered); error_threshold = ResultMismatch_RelaxedUnequal; break;
        case CmpNE: ret = !((result == ResultEqual) || (result == ResultEqualUnordered)); error_threshold = ResultMismatch_RelaxedUnequal; break;
        case CmpGT: ret = (result == ResultHigher); error_threshold = ResultEqualUnordered; break;
        case CmpGE: ret = (result == ResultEqual) || (result == ResultHigher); error_threshold = ResultEqualUnordered; break;
        case CmpLT: ret = (result == ResultLower); error_threshold = ResultEqualUnordered; break;
        case CmpLE: ret = (result == ResultEqual) || (result == ResultLower); error_threshold = ResultEqualUnordered; break;
        case CmpREQ: ret = (result == ResultEqual) || (result == ResultEqualUnordered) || (result == ResultUnequal_RelaxedEqual); error_threshold = ResultMismatch; break;
        case CmpRNE: ret = !((result == ResultEqual) || (result == ResultEqualUnordered) || (result == ResultUnequal_RelaxedEqual)); error_threshold = ResultMismatch; break;
        default:;
        }
        if (result >= error_threshold)
        {
                SString msg = "Type mismatch while comparing";
                if (context)
                {
                        if (context->v1 && context->v2)
                                msg += SString::sprintf(": %s %s %s",
                                context->v1->typeAndValue().c_str(),
                                cmp_op_names[op - CmpFIRST],
                                context->v2->typeAndValue().c_str());
                }
                logPrintf("ExtValue", "interpretCompare", LOG_ERROR, "%s", msg.c_str());
                ret = -1;
        }
        return ret;
}

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)
{
        // return = ok, break = fail
        switch (type)
        {
        case TInt:
                switch (src.getType())
                {
                case TDouble:
                        logPrintf("ExtValue", "add", LOG_WARN, "Adding %s to %s", src.typeAndValue().c_str(), typeAndValue().c_str());
                        setDouble(double(getInt()) + src.getDouble());
                        return;
                case TString:
                        break;
                default:
                        idata() += src.getInt();
                        return;
                }
                break;
        case TDouble:
                switch (src.getType())
                {
                case TString:
                        break;
                default:
                        ddata() += src.getDouble();
                        return;
                }
                break;
        case TString: sdata() += src.getString(); return;
        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;
        default:;
        }
        logPrintf("ExtValue", "add", LOG_ERROR, "Can't add %s to %s", src.typeAndValue().c_str(), typeAndValue().c_str());
}

void ExtValue::operator-=(const ExtValue& src)
{
        // return = ok, break = fail
        switch (type)
        {
        case TInt:
                switch (src.getType())
                {
                case TInt:
                        idata() -= src.getInt();
                        return;
                case TDouble:
                        logPrintf("ExtValue", "subtract", LOG_WARN, "Subtracting %s from %s", src.typeAndValue().c_str(), typeAndValue().c_str());
                        setDouble(double(getInt()) - src.getDouble());
                        return;
                default:;
                }
                break;
        case TDouble:
                switch (src.getType())
                {
                case TDouble:
                case TInt:
                        ddata() -= src.getDouble();
                        return;
                default:;
                }
                break;
        default:;
        }
        logPrintf("ExtValue", "subtract", LOG_ERROR, "Can't subtract %s from %s", src.typeAndValue().c_str(), typeAndValue().c_str());
}

void ExtValue::operator*=(const ExtValue& src)
{
        // return = ok, break = fail
        switch (type)
        {
        case TInt:
                switch (src.getType())
                {
                case TInt:
                        idata() *= src.getInt();
                        return;
                case TDouble:
                        logPrintf("ExtValue", "multiply", LOG_WARN, "Multiplying %s by %s", typeAndValue().c_str(), src.typeAndValue().c_str());
                        setDouble(double(getInt())*src.getDouble());
                        return;
                default:;
                }
                break;
        case TDouble:
                switch (src.getType())
                {
                case TInt:
                case TDouble:
                        ddata() *= src.getDouble();
                        return;
                default:;
                }
                break;
        case TString:
                switch (src.getType())
                {
                case TInt: case TDouble:
                {
                        SString t;
                        for (int n = src.getInt(); n > 0; n--)
                                t += getString();
                        setString(t);
                        return;
                }
                default:;
                }
                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;
        default:;
        }
        logPrintf("ExtValue", "multiply", LOG_WARN, "Can't multiply %s by %s", typeAndValue().c_str(), src.typeAndValue().c_str());
}

/*#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::divInt(paInt a)
{
        if (a)
                idata() /= a;
        else
        {
                logPrintf("ExtValue", "divide", LOG_CRITICAL, "Division by zero: %d/0", idata());
                setInvalid();
        }
}

void ExtValue::divDouble(double a)
{
        if (a == 0.0)
        {
                logPrintf("ExtValue", "divide", LOG_CRITICAL, "Division by zero: %s/0.0", getString().c_str());
                setInvalid();
        }
        else
        {
                fpExceptDisable();
                double tmp = getDouble() / a;
                if (!finite(tmp))
                {
                        logPrintf("ExtValue", "divide", LOG_CRITICAL, "Overflow %s/%g", getString().c_str(), a); setInvalid();
                }
                else
                        setDouble(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
                //        { logPrintf("ExtValue","divide",LOG_ERROR,"not-a-number",(const char*)getString()); setInvalid(); }
                fpExceptEnable();
        }
}

void ExtValue::operator/=(const ExtValue& src)
{
        switch (type)
        {
        case TInt:
                switch (src.getType())
                {
                case TInt:
                        divInt(src.idata());
                        return;
                case TDouble:
                        logPrintf("ExtValue", "divide", LOG_WARN, "Dividing %s by %s", typeAndValue().c_str(), src.typeAndValue().c_str());
                        divDouble(src.ddata());
                        return;
                default:;
                }
                break;

        case TDouble:
                switch (src.getType())
                {
                case TInt:
                        divDouble(src.getDouble());
                        return;
                case TDouble:
                        divDouble(src.ddata());
                        return;
                default:;
                }
                break;

        default:;
        }
        logPrintf("ExtValue", "divide", LOG_ERROR, "Can't divide %s by %s", typeAndValue().c_str(), src.typeAndValue().c_str());
}

SString ExtValue::format(SString& fmt, const ExtValue **values, int count)
{
        SString ret;
        // "..........%.........%..........%........"
        //  ^_cur     ^_next
        //  ^^^^^^^^^^___sub
        //
        // "..........%.........%..........%........"
        //            ^-cur     ^-next
        //            ^^^^^^^^^^___sub
        const char* begin = fmt.c_str(), *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((int)(curr - begin));
                        break;
                }
                SString sub = fmt.substr((int)(curr - begin), (int)(next - curr));
                switch (type)
                {
                case 'd': a = args.getNext(); ret += SString::sprintf(sub.c_str(), a ? a->getInt() : 0); break;
                case 'f': a = args.getNext(); ret += SString::sprintf(sub.c_str(), a ? a->getDouble() : 0); break;
                case 's': {a = args.getNext(); SString tmp; if (a) tmp = a->getString(); ret += SString::sprintf(sub.c_str(), tmp.c_str()); } 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:
                logPrintf("ExtValue", "modulo", LOG_WARN, "Can't apply modulo to %s", typeDescription().c_str());

        default:;
        }
}

bool ExtValue::parseInt(const char* s, paInt &result, bool strict, bool error)
{
        ExtValue tmp;
        const char* after = tmp.parseNumber(s, strict ? TInt : TUnknown);
        if ((after == NULL) || (after[0] != 0))
        {
                if (error)
                        logPrintf("ExtValue", "parseInt", LOG_ERROR, "Could not parse '%s'%s", s, strict ? " (strict)" : "");
                return false;
        }
        result = tmp.getInt();
        return true;
}

bool ExtValue::parseDouble(const char* s, double &result, bool error)
{
        ExtValue tmp;
        const char* after = tmp.parseNumber(s, TDouble);
        if ((after == NULL) || (after[0] != 0))
        {
                if (error)
                        logPrintf("ExtValue", "parseDouble", LOG_ERROR, "Could not parse '%s'", s);
                return false;
        }
        result = tmp.getDouble();
        return true;
}

paInt ExtValue::getInt(const char* s, bool strict)
{
        paInt result;
        if (parseInt(s, result, strict, true))
                return result;
        return 0;
}

double ExtValue::getDouble(const char* s)
{
        double result;
        if (parseDouble(s, result, true))
                return result;
        return 0;
}

paInt ExtValue::getInt() const
{
        switch (type)
        {
        case TInt: return idata();
        case TDouble: return (int)ddata();
        case TString: return getInt(sdata().c_str());
        case TObj:
                logPrintf("ExtValue", "getInt", LOG_WARN, "Getting integer value from object reference (%s)", getString().c_str());
                return (paInt)(intptr_t)odata().param;
        default:;
        }
        return 0;
}

double ExtValue::getDouble() const
{
        switch (type)
        {
        case TDouble: return ddata();
        case TInt: return (double)idata();
        case TString: return getDouble(sdata().c_str());
        case TObj:
                logPrintf("ExtValue", "getDouble", LOG_WARN, "Getting floating point value from object reference (%s)", getString().c_str());
                return (double)(intptr_t)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
/// @param strict_type = restrict the allowed return value (TUnknown = unrestricted)
const char* ExtValue::parseNumber(const char* in, ExtPType strict_type)
{
        char* after;
        if (in == NULL) return NULL;
        if (in[0] == 0) return NULL;
        while (isspace(*in)) in++;
        bool minus = (in[0] == '-');
        bool plus = (in[0] == '+');
        if (((in[0] == '0') && ((in[1] == 'x') || (in[1] == 'X')))
                || (((minus || plus) && (in[1] == '0') && ((in[2] == 'x') || (in[2] == 'X')))))
        {
                in += (minus || plus) ? 3 : 2;
                if (isspace(*in)) return NULL;
                errno = 0;
                unsigned long intvalue = strtoul(in, &after, 16);
                if ((after > in) && (errno == 0) && (intvalue <= 0xffffffff))
                {
                        if (strict_type == TDouble)
                                setDouble(minus ? -(double)intvalue : (double)intvalue);
                        else
                                setInt(minus ? -intvalue : intvalue);
                        return after;
                }
                else
                        return NULL;
        }

        errno = 0;
        double fpvalue = strtod(in, &after);
        if ((after > in) && (errno == 0))
        {
                if (strict_type != TDouble)
                {
                        if ((memchr(in, '.', after - in) == NULL) && (memchr(in, 'e', after - in) == NULL) && (memchr(in, 'E', after - in) == NULL) // no "special" characters
                                && (fpvalue == floor(fpvalue)) // value is integer
                                && (fpvalue >= INT_MIN) && (fpvalue <= INT_MAX)) // within limits
                        {
                                setInt(fpvalue);
                                return after;
                        }
                        else if (strict_type == TInt)
                                return NULL;
                }
                setDouble(fpvalue);
                return after;
        }
        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, (int)(ret - (in + 1)));
                sstringUnquote(s);
                setString(s);
                if (*ret == '\"')
                        return ret + 1;
                else
                {
                        logPrintf("ExtValue", "deserialize", LOG_ERROR, "Missing '\"' in string: '%s'", ret);
                        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 if (*p != ']')
                                {
                                        logPrintf("ExtValue", "deserialize", LOG_ERROR, "Missing ',' in Vector: '%s'", p);
                                        return NULL;
                                }
                        }
                        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 != ':') { logPrintf("ExtValue", "deserialize", LOG_ERROR, "Missing ':' in Dictionary: '%s'", 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++;
                        else if (*p != '}')
                        {
                                logPrintf("ExtValue", "deserialize", LOG_ERROR, "Missing ',' in Dictionary: '%s'", p);
                                return NULL;
                        }
                }
                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, TInt);
                if (ret && (ref.getType() == TInt))
                {
                        const ExtObject* o = tlsGetRef(ExtObject_serialization).get(ref.getInt());
                        if (o)
                        {
                                setObject(*o);
                                return ret;
                        }
                }
                logPrintf("ExtValue", "deserialize", LOG_ERROR, "Invalid reference: '%s'", in - 1);
                return NULL;
        }
        else if ((ret = skipWord(in)) && (ret != in))
        {
                SString clsname(in, (int)(ret - in));
                ExtValue tmp;
                ret = tmp.deserialize(ret);
                ParamInterface *cls = findDeserializableClass(clsname.c_str());
                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();
                logPrintf("ExtValue", "deserialize", LOG_WARN, "object of class \"%s\" could not be deserialized", clsname.c_str());
                return ret;
        }
        logPrintf("ExtValue", "deserialize", LOG_ERROR, "Bad syntax: '%s'", in);
        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()
{
        static const char* typenames[] = { "null", "int", "float", "string", "", "invalid" };
        if (getType() != TObj)
                return ExtValue(typenames[(int)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();
}