source: cpp/frams/util/extvalue.h @ 387

// 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.

#ifndef _EXTVALUE_H_
#define _EXTVALUE_H_

#include "sstring.h"
#include <frams/param/param.h>
#include <common/nonstd_stl.h>
#include <common/threads.h>

#define EXTVALUEUNION
template <int A, int B> struct CompileTimeMax { enum { val = A > B ? A : B }; };
#define EXTVALUEUNIONSIZE CompileTimeMax<sizeof(ExtObject),sizeof(SString)>::val

enum ExtPType
{
        TUnknown = 0, TInt, TDouble, TString, TObj, TInvalid
};

/**
   destructable object
   */
class DestrBase
{
public:
        int refcount;
        DestrBase() :refcount(0) {}
        void incref() { refcount++; }
        void decref() { refcount--; if (refcount == 0) delete this; }
        virtual ~DestrBase() {}
};

/**
   object reference.
   */
class ExtObject
{
        int subtype;                    //< 0/1=Generic/DPC Object,  0/2=Standalone/Shared Param
        void incref() const;
        void decref() const;
public:
        union {
                void* object;           //< generic object, will use param
                DestrBase *dbobject;    //< object with refcounting, will be deleted if refcount goes to 0
        };
        union {
                Param* param;           //< if object!=0
                ParamInterface *paraminterface; //< if object==0
        };

        void copyFrom(const ExtObject& src)  { subtype = src.subtype; object = src.object; param = src.param; }

        void* operator new(size_t s, void* mem){ return mem; }
#ifdef _MSC_VER
                void operator delete(void* mem, void* t) {}
#endif
        void* operator new(size_t s){ return malloc(sizeof(ExtObject)); }
        void operator delete(void* mem) { free(mem); }
        ///@param tmp_param can be used for temporary storage, the result ParamInterface* is only valid for as long as tmp_param is valid
        ParamInterface *getParamInterface(Param &tmp_param) const  { if (subtype & 2){ tmp_param.setParamTab(param->getParamTab()); tmp_param.select(object); return &tmp_param; } return paraminterface; }
        const char* interfaceName() const { if (isEmpty()) return "Empty"; return (subtype & 2) ? param->getName() : paraminterface->getName(); }
        bool matchesInterfaceName(ParamInterface* pi) const { return !strcmp(interfaceName(), pi->getName()); }
        void* getTarget() const { return (subtype & 1) ? dbobject : object; }
        void* getTarget(const char* classname, bool through_barrier = true, bool warn = true) const;
        void setEmpty() { decref(); subtype = 0; param = NULL; object = NULL; }
        int isEmpty() const { return !param; }
        static const ExtObject& empty() { static const ExtObject& e((ParamInterface*)NULL); return e; }
        ExtObject(const ExtObject& src)      { src.incref(); copyFrom(src); }
        void operator=(const ExtObject& src) { src.incref(); decref(); copyFrom(src); }
        bool makeUnique();//< @return false if nothing has changed

        bool operator==(const ExtObject& src) const;

        SString toString() const;
        SString serialize_inner() const;
        SString serialize() const;

        ExtObject(Param *p, void *o) :subtype(2), object(o), param(p){}
        ExtObject(ParamInterface *p = 0) :subtype(0), object(0), paraminterface(p){}
        ExtObject(Param *p, DestrBase *o) :subtype(1 + 2), dbobject(o), param(p){ incref(); }
        ExtObject(ParamInterface *p, DestrBase *o) :subtype(1), dbobject(o), paraminterface(p){ incref(); }

        ~ExtObject(){ decref(); }

        class Serialization
        {
                std::vector<ExtObject> refs;
                int level;
        public:
                Serialization() :level(0) {}
                void begin();
                void end();
                int add(const ExtObject& o);
                void replace(const ExtObject& o, const ExtObject& other);
                void remove(const ExtObject& o);
                const ExtObject* get(int ref);
        };

};

extern THREAD_LOCAL_DECL(ExtObject::Serialization, ExtObject_serialization);

class ExtValue
{
public:
        ExtPType type;
#ifdef EXTVALUEUNION
        intptr_t data[(EXTVALUEUNIONSIZE + sizeof(intptr_t) - 1) / sizeof(intptr_t)];
        paInt& idata() const { return (paInt&)data[0]; };
        double& ddata() const { return *(double*)data; };
        ExtObject& odata() const { return *(ExtObject*)data; };
        SString& sdata() const { return *(SString*)data; };
#else
        union {
                paInt i;
                double d;
                SString *s;
                ExtObject *o;
        };
        paInt& idata() const {return (paInt&)i;};
        double& ddata() const {return (double&)d;};
        ExtObject& odata() const {return *o;};
        SString& sdata() const {return *s;};
#endif

        void* operator new(size_t s, void* mem){ return mem; }
        void* operator new(size_t s){ return ::operator new(s); }

                ExtValue() :type(TUnknown){}
        ~ExtValue() { setEmpty(); }
        ExtValue(paInt v) { seti(v); }
        ExtValue(double v) { setd(v); }
        ExtValue(const SString &v) { sets(v); }
        ExtValue(const ExtObject &srco) { seto(srco); }
        static ExtValue invalid() { ExtValue v; v.setInvalid(); return v; }
        static const ExtValue& empty() { static const ExtValue v; return v; }
        static const ExtValue& zero() { static const ExtValue v(0); return v; }

        enum CompareResult
        {
                ResultLower = -1, ResultEqual = 0, ResultHigher = 1,
                ResultEqualUnordered,
                ResultUnequal_RelaxedEqual,
                ResultUnequal_RelaxedUnequal,
                ResultMismatch_RelaxedUnequal,
                ResultMismatch
        };
        // performs all script value comparisons.
        // relaxed comparison (internal use only, not available in scripts) works like regular == with additional null~=0, notnull!~0
        // and is used for pseudo-boolean conversion allowing for expressions like "if (null) ..."
        CompareResult compare(const ExtValue& src) const;

        enum CmpOperator { CmpFIRST, CmpEQ = CmpFIRST, CmpNE, CmpGE, CmpLE, CmpGT, CmpLT,/*relaxed (not)equal*/CmpREQ, CmpRNE };
        static const char* cmp_op_names[];
        struct CmpContext { const ExtValue *v1, *v2; };
        // interpret compare() result, optional context controls error messages
        // @return 0=false, 1=true, -1=undefined (null in script)
        static int interpretCompare(CmpOperator op, CompareResult result, CmpContext *context = NULL);

        void divInt(paInt a);
        void divDouble(double a);

        int operator==(const ExtValue& src) const;
        void operator+=(const ExtValue& src);
        void operator-=(const ExtValue& src);
        void operator*=(const ExtValue& src);
        void operator/=(const ExtValue& src);
        void operator%=(const ExtValue& src);
        void operator=(const ExtValue& src)
        {
                setr(src);
        }
        ExtValue(const ExtValue& src)
                :type(TUnknown) {
                set(src);
        }
        void setEmpty();
        void setInvalid() { setEmpty(); type = TInvalid; }
        bool makeUnique() { return (type == TObj) && odata().makeUnique(); } //< @return false if nothing has changed
        ExtPType getType() const { return type; }
        void *getObjectTarget(const char* classname, bool warn = true) const;
        void setInt(paInt v) { if (type != TInt) setri(v); else idata() = v; }
        void setDouble(double v) { if (type != TDouble) setrd(v); else ddata() = v; }
        void setString(const SString &v) { if (type != TString) setrs(v); else sdata() = v; }
        void setObject(const ExtObject &src) { if (type != TObj) setro(src); else odata() = src; }
        static bool parseInt(const char* s, paInt &result, bool strict, bool error);
        static bool parseDouble(const char* s, double &result, bool error);
        static paInt getInt(const char* s, bool strict = false);//< @param strict=true will fail on floating point
        static double getDouble(const char* s);
        paInt getInt() const;
        double getDouble() const;
        SString getString() const;
        const SString* getStringPtr() const;//< @return pointer to the internal sstring object or NULL if the current type is not string
        SString serialize() const;
        ExtObject getObject() const;
        bool isNull() const { return (type == TUnknown) || ((type == TObj) && odata().isEmpty()); }
        SString typeDescription() const;//< @return human readable type name (used in error messages)
        SString typeAndValue() const;//< @return type and value (used in error messages)
        const char* parseNumber(const char* in, ExtPType strict_type = TUnknown);
        const char* deserialize(const char* in);//< @return first character after the succesfully parsed string or NULL if failed
        const char* deserialize_inner(const char* in);
        static ParamInterface *findDeserializableClass(const char* name);
        static PtrListTempl<ParamInterface*> &getDeserializableClasses();
        template<typename T> class AddDeserializable
        {
        public:
                AddDeserializable() { ExtValue::getDeserializableClasses() += &T::getStaticParam(); }
        };

        static SString format(SString& fmt, const ExtValue **values, int count);

        ExtValue getExtType();

private: // setrx - release and set, setx - assume released
        void setr(const ExtValue& src){ setEmpty(); set(src); }
        void set(const ExtValue& src);
        void setri(paInt v) { setEmpty(); seti(v); }
        void setrd(double v) { setEmpty(); setd(v); }
        void seti(paInt v) { type = TInt; idata() = v; }
        void setd(double v) { type = TDouble; ddata() = v; }
#ifdef EXTVALUEUNION
        void setrs(const SString &v) { setEmpty(); sets(v); }
        void setro(const ExtObject &src) { setEmpty(); seto(src); }
        void sets(const SString &v) { type = TString; new(data)SString(v); }
        void seto(const ExtObject &src) { type = TObj; new(data)ExtObject(src); }
#else
        void setrs(const SString &v) {setEmpty();sets(v);}
        void setro(const ExtObject &src) {setEmpty();seto(src);}
        void sets(const SString &v) {type=TString;s=new SString(v);}
        void seto(const ExtObject &src) {type=TObj;o=new ExtObject(src);}
#endif

};

#define REGISTER_DESERIALIZABLE(name) ExtValue::AddDeserializable<name> deserializable_autoinit_ ## name;

#endif