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QoreValue.h
/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
QoreValue.h
Qore Programming Language
Copyright (C) 2003 - 2016 David Nichols
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
Note that the Qore library is released under a choice of three open-source
licenses: MIT (as above), LGPL 2+, or GPL 2+; see README-LICENSE for more
information.
*/
#ifndef _QORE_QOREVALUE_H
#define _QORE_QOREVALUE_H
#include <assert.h>
typedef unsigned char valtype_t;
#define QV_Bool (valtype_t)0
#define QV_Int (valtype_t)1
#define QV_Float (valtype_t)2
#define QV_Node (valtype_t)3
#define QV_Ref (valtype_t)4
// forward reference
class AbstractQoreNode;
class QoreString;
union qore_value_u {
bool b;
int64 i;
double f;
AbstractQoreNode* n;
// void* p;
};
namespace detail {
template<typename Type>
struct QoreValueCastHelper {
typedef Type * Result;
template<typename QV>
static Result cast(QV *qv, valtype_t type) {
assert(type == QV_Node);
assert(!qv->v.n || dynamic_cast<Result>(qv->v.n));
return reinterpret_cast<Result>(qv->v.n);
}
};
template<>
struct QoreValueCastHelper<bool> {
typedef bool Result;
template<typename QV>
static bool cast(QV *qv, valtype_t type) {
return qv->getAsBool();
}
};
template<>
struct QoreValueCastHelper<double> {
typedef double Result;
template<typename QV>
static double cast(QV *qv, valtype_t type) {
return qv->getAsFloat();
}
};
template<>
struct QoreValueCastHelper<int64> {
typedef int64 Result;
template<typename QV>
static double cast(QV *qv, valtype_t type) {
return qv->getAsBigInt();
}
};
} // namespace detail
struct QoreValue {
friend class ValueHolder;
friend class ValueEvalRefHolder;
template<typename> friend struct detail::QoreValueCastHelper;
protected:
DLLEXPORT AbstractQoreNode* takeNodeIntern();
public:
qore_value_u v;
valtype_t type;
DLLEXPORT QoreValue();
DLLEXPORT QoreValue(bool b);
DLLEXPORT QoreValue(int i);
DLLEXPORT QoreValue(unsigned int i);
DLLEXPORT QoreValue(long i);
DLLEXPORT QoreValue(unsigned long i);
DLLEXPORT QoreValue(unsigned long long i);
DLLEXPORT QoreValue(int64 i);
DLLEXPORT QoreValue(double f);
// the QoreValue object takes the reference of the argument
DLLEXPORT QoreValue(AbstractQoreNode* n);
// does not reference n for any assignment
// sanitizes n (increases the reference of n if necessary) - meaning:
// if possible, the value is converted to an immediate value in place
// (int, float, or bool)
DLLEXPORT QoreValue(const AbstractQoreNode* n);
DLLEXPORT QoreValue(const QoreValue& old);
DLLEXPORT void swap(QoreValue& val);
DLLEXPORT bool getAsBool() const;
DLLEXPORT int64 getAsBigInt() const;
DLLEXPORT double getAsFloat() const;
DLLEXPORT void ref() const;
DLLEXPORT QoreValue refSelf() const;
DLLEXPORT AbstractQoreNode* getInternalNode();
DLLEXPORT const AbstractQoreNode* getInternalNode() const;
// the QoreValue object takes the reference of the argument
DLLEXPORT AbstractQoreNode* assign(AbstractQoreNode* n);
// the QoreValue object will increase the reference of n if necessary
//returns 0 or the previously held AbstractQoreNode*
// FIXME: remove with new API/ABI
DLLEXPORT AbstractQoreNode* assignAndSanitize(const QoreValue n);
DLLEXPORT AbstractQoreNode* assign(int64 n);
DLLEXPORT AbstractQoreNode* assign(double n);
DLLEXPORT AbstractQoreNode* assign(bool n);
DLLEXPORT AbstractQoreNode* assignNothing();
DLLEXPORT bool isEqualSoft(const QoreValue v, ExceptionSink* xsink) const;
DLLEXPORT bool isEqualHard(const QoreValue v) const;
// FIXME: remove with new API/ABI
// converts pointers to efficient representations
DLLEXPORT void sanitize();
DLLEXPORT QoreValue& operator=(const QoreValue& n);
// dereferences any contained AbstractQoreNode pointer and sets to 0; does not modify other values
DLLEXPORT void discard(ExceptionSink* xsink);
DLLEXPORT void clear();
DLLEXPORT int getAsString(QoreString& str, int format_offset, ExceptionSink *xsink) const;
DLLEXPORT QoreString* getAsString(bool& del, int foff, ExceptionSink* xsink) const;
template<typename T>
DLLLOCAL T* take() {
assert(type == QV_Node);
assert(dynamic_cast<T*>(v.n));
T* rv = reinterpret_cast<T*>(v.n);
v.n = 0;
return rv;
}
template<typename T>
DLLLOCAL typename detail::QoreValueCastHelper<T>::Result get() {
return detail::QoreValueCastHelper<T>::cast(this, type);
}
template<typename T>
DLLLOCAL typename detail::QoreValueCastHelper<const T>::Result get() const {
return detail::QoreValueCastHelper<const T>::cast(this, type);
}
DLLEXPORT AbstractQoreNode* getReferencedValue() const;
DLLEXPORT AbstractQoreNode* takeNode();
DLLEXPORT AbstractQoreNode* takeIfNode();
DLLEXPORT qore_type_t getType() const;
DLLEXPORT const char* getTypeName() const;
DLLEXPORT bool hasNode() const;
DLLEXPORT bool isNothing() const;
DLLEXPORT bool isNull() const;
DLLEXPORT bool isNullOrNothing() const;
};
class ValueHolderBase {
protected:
QoreValue v;
ExceptionSink* xsink;
public:
DLLLOCAL ValueHolderBase(ExceptionSink* xs) : xsink(xs) {
}
DLLLOCAL ValueHolderBase(QoreValue n_v, ExceptionSink* xs) : v(n_v), xsink(xs) {
}
DLLLOCAL QoreValue* operator->() { return &v; }
DLLLOCAL QoreValue& operator*() { return v; }
};
class ValueHolder : public ValueHolderBase {
public:
DLLLOCAL ValueHolder(ExceptionSink* xs) : ValueHolderBase(xs) {
}
DLLLOCAL ValueHolder(QoreValue n_v, ExceptionSink* xs) : ValueHolderBase(n_v, xs) {
}
DLLEXPORT ~ValueHolder();
DLLEXPORT AbstractQoreNode* getReferencedValue();
DLLEXPORT QoreValue release();
DLLLOCAL QoreValue& operator=(QoreValue nv) {
v.discard(xsink);
v = nv;
return v;
}
DLLLOCAL operator bool() const {
return v.type == QV_Node && v.v.n;
}
};
class ValueOptionalRefHolder : public ValueHolderBase {
private:
// not implemented
DLLLOCAL QoreValue& operator=(QoreValue& nv);
protected:
bool needs_deref;
DLLLOCAL ValueOptionalRefHolder(ExceptionSink* xs) : ValueHolderBase(xs), needs_deref(false) {
}
public:
DLLLOCAL ValueOptionalRefHolder(QoreValue n_v, bool nd, ExceptionSink* xs) : ValueHolderBase(n_v, xs), needs_deref(nd) {
}
DLLEXPORT ~ValueOptionalRefHolder();
DLLLOCAL bool isTemp() const { return needs_deref; }
DLLLOCAL void setTemp() {
assert(needs_deref);
needs_deref = false;
}
DLLLOCAL operator bool() const {
return v.type == QV_Node && v.v.n;
}
DLLLOCAL void setTemp(QoreValue nv) {
if (needs_deref)
v.discard(xsink);
v = nv;
}
};
class ValueEvalRefHolder : public ValueOptionalRefHolder {
protected:
public:
DLLEXPORT ValueEvalRefHolder(const AbstractQoreNode* exp, ExceptionSink* xs);
// ensures that the held value is referenced
DLLEXPORT void ensureReferencedValue();
template<typename T>
DLLLOCAL T* takeReferencedNode() {
T* rv = v.take<T>();
if (needs_deref)
needs_deref = false;
else
rv->ref();
return rv;
}
// leaves the container empty
DLLEXPORT AbstractQoreNode* getReferencedValue();
DLLLOCAL AbstractQoreNode* takeNode(bool& nd) {
if (v.type == QV_Node) {
nd = needs_deref;
return v.takeNodeIntern();
}
nd = true;
return v.takeNode();
}
DLLLOCAL QoreValue takeValue(bool& nd) {
if (v.type == QV_Node) {
nd = needs_deref;
return v.takeNodeIntern();
}
nd = false;
return v;
}
DLLEXPORT QoreValue takeReferencedValue();
};
#endif
AbstractQoreNode
The base class for all value and parse types in Qore expression trees.
Definition: AbstractQoreNode.h:55
discard
static void discard(AbstractQoreNode *n, ExceptionSink *xsink)
to deref an AbstractQoreNode (when the pointer may be 0)
Definition: QoreLib.h:322
QoreString
Qore&#39;s string type supported by the QoreEncoding class.
Definition: QoreString.h:82
detail::QoreValueCastHelper
used in QoreValue::get()
Definition: QoreValue.h:60
ExceptionSink
container for holding Qore-language exception information and also for registering a &quot;thread_exit&quot; ca...
Definition: ExceptionSink.h:43
int64
long long int64
64bit integer type, cannot use int64_t here since it breaks the API on some 64-bit systems due to equ...
Definition: common.h:228
qore_type_t
int16_t qore_type_t
used to identify unique Qore data and parse types (descendents of AbstractQoreNode) ...
Definition: common.h:68