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AbstractQoreNode.h
/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
AbstractQoreNode.h
Qore Programming Language
Copyright (C) 2003 - 2022 Qore Technologies, s.r.o.
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_ABSTRACTQORENODE_H
#define _QORE_ABSTRACTQORENODE_H
#include <qore/common.h>
#include <qore/QoreReferenceCounter.h>
#include <qore/node_types.h>
#include <string>
#include <cassert>
#define FMT_YAML_SHORT -2
#define FMT_NONE -1
#define FMT_NORMAL 0
class LocalVar;
// forward declaration
struct QoreParseContext;
class AbstractQoreNode : public QoreReferenceCounter {
public:
DLLEXPORT AbstractQoreNode(qore_type_t t, bool n_value, bool n_needs_eval, bool n_there_can_be_only_one = false, bool n_custom_reference_handlers = false);
DLLEXPORT AbstractQoreNode(const AbstractQoreNode& v);
DLLEXPORT bool getAsBool() const;
DLLEXPORT int getAsInt() const;
DLLEXPORT int64 getAsBigInt() const;
DLLEXPORT double getAsFloat() const;
DLLEXPORT virtual QoreString* getStringRepresentation(bool& del) const;
DLLEXPORT virtual void getStringRepresentation(QoreString &str) const;
DLLEXPORT virtual class DateTime* getDateTimeRepresentation(bool& del) const;
DLLEXPORT virtual void getDateTimeRepresentation(DateTime &dt) const;
DLLEXPORT virtual int getAsString(QoreString &str, int foff, ExceptionSink* xsink) const = 0;
DLLEXPORT virtual QoreString *getAsString(bool& del, int foff, ExceptionSink* xsink) const = 0;
DLLLOCAL bool needs_eval() const {
return needs_eval_flag;
}
DLLEXPORT virtual AbstractQoreNode* realCopy() const = 0;
DLLEXPORT virtual bool is_equal_soft(const AbstractQoreNode* v, ExceptionSink* xsink) const = 0;
DLLEXPORT virtual bool is_equal_hard(const AbstractQoreNode* v, ExceptionSink* xsink) const = 0;
DLLLOCAL qore_type_t getType() const {
return type;
}
DLLEXPORT virtual const char* getTypeName() const = 0;
DLLEXPORT QoreValue eval(ExceptionSink* xsink) const;
DLLEXPORT QoreValue eval(bool& needs_deref, ExceptionSink* xsink) const;
DLLLOCAL bool is_value() const {
return value;
}
DLLEXPORT void deref(ExceptionSink* xsink);
DLLEXPORT AbstractQoreNode* refSelf() const;
DLLEXPORT void ref() const;
DLLLOCAL bool isReferenceCounted() const { return !there_can_be_only_one; }
DLLLOCAL virtual int parseInit(QoreValue& val, QoreParseContext& parse_context);
DLLLOCAL AbstractQoreNode& operator=(const AbstractQoreNode&);
DLLLOCAL virtual bool getAsBoolImpl() const { return false; }
DLLLOCAL virtual int getAsIntImpl() const { return 0; }
DLLLOCAL virtual int64 getAsBigIntImpl() const { return 0; }
DLLLOCAL virtual double getAsFloatImpl() const { return 0.0; }
DLLEXPORT virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const = 0;
DLLEXPORT virtual bool derefImpl(ExceptionSink* xsink);
DLLEXPORT virtual void customRef() const;
DLLEXPORT virtual void customDeref(ExceptionSink* xsink);
protected:
qore_type_t type : 11;
bool value : 1;
bool needs_eval_flag : 1;
bool there_can_be_only_one : 1;
bool custom_reference_handlers : 1;
DLLEXPORT virtual ~AbstractQoreNode();
};
class SimpleQoreNode : public AbstractQoreNode {
public:
SimpleQoreNode& operator=(const SimpleQoreNode&) = delete;
DLLLOCAL SimpleQoreNode(qore_type_t t, bool n_value, bool n_needs_eval, bool n_there_can_be_only_one = false) : AbstractQoreNode(t, n_value, n_needs_eval, n_there_can_be_only_one) { }
DLLLOCAL SimpleQoreNode(const SimpleQoreNode& v) : AbstractQoreNode(v) { }
using AbstractQoreNode::deref;
DLLEXPORT void deref();
};
class SimpleValueQoreNode : public SimpleQoreNode {
public:
DLLLOCAL SimpleValueQoreNode(qore_type_t t, bool n_there_can_be_only_one = false) : SimpleQoreNode(t, true, false, n_there_can_be_only_one) { }
DLLLOCAL SimpleValueQoreNode(const SimpleValueQoreNode& v) : SimpleQoreNode(v) { }
protected:
DLLEXPORT virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const;
};
class UniqueValueQoreNode : public SimpleValueQoreNode {
public:
DLLLOCAL UniqueValueQoreNode& operator=(const UniqueValueQoreNode&) = delete;
DLLLOCAL void *operator new(size_t) = delete;
DLLLOCAL UniqueValueQoreNode(qore_type_t t) : SimpleValueQoreNode(t, true) { }
DLLLOCAL UniqueValueQoreNode(const UniqueValueQoreNode& ) : SimpleValueQoreNode(type, true) { }
DLLEXPORT virtual AbstractQoreNode* realCopy() const;
};
#endif
AbstractQoreNode
The base class for all value and parse types in Qore expression trees.
Definition: AbstractQoreNode.h:57
AbstractQoreNode::needs_eval
DLLLOCAL bool needs_eval() const
returns true if the object needs evaluation to return a value, false if not
Definition: AbstractQoreNode.h:145
AbstractQoreNode::customRef
virtual DLLEXPORT void customRef() const
special processing when the object's reference count transitions from 0-1
AbstractQoreNode::is_equal_hard
virtual DLLEXPORT bool is_equal_hard(const AbstractQoreNode *v, ExceptionSink *xsink) const =0
tests for equality ("deep compare" including all contained values for container types) without type c...
AbstractQoreNode::value
bool value
this is true for values, if false then either the type needs evaluation to produce a value or is a pa...
Definition: AbstractQoreNode.h:330
AbstractQoreNode::refSelf
DLLEXPORT AbstractQoreNode * refSelf() const
returns "this" with an incremented reference count
AbstractQoreNode::ref
DLLEXPORT void ref() const
increments the reference count
AbstractQoreNode::getStringRepresentation
virtual DLLEXPORT void getStringRepresentation(QoreString &str) const
concatentates the value of the type to an existing QoreString reference, default implementation does ...
AbstractQoreNode::getAsBoolImpl
virtual DLLLOCAL bool getAsBoolImpl() const
default implementation, returns false
Definition: AbstractQoreNode.h:266
AbstractQoreNode::getAsBigInt
DLLEXPORT int64 getAsBigInt() const
returns the 64-bit integer value of the object
AbstractQoreNode::getAsString
virtual DLLEXPORT int getAsString(QoreString &str, int foff, ExceptionSink *xsink) const =0
concatenate the verbose string representation of the value (including all contained values for contai...
AbstractQoreNode::getAsFloat
DLLEXPORT double getAsFloat() const
returns the float value of the object
AbstractQoreNode::getAsBigIntImpl
virtual DLLLOCAL int64 getAsBigIntImpl() const
default implementation, returns 0
Definition: AbstractQoreNode.h:278
AbstractQoreNode::realCopy
virtual DLLEXPORT AbstractQoreNode * realCopy() const =0
returns a copy of the object; the caller owns the reference count
AbstractQoreNode::there_can_be_only_one
bool there_can_be_only_one
if this is set to true, then reference counting is turned off for objects of this class
Definition: AbstractQoreNode.h:336
AbstractQoreNode::parseInit
virtual DLLLOCAL int parseInit(QoreValue &val, QoreParseContext &parse_context)
for use by parse types to initialize them for execution during stage 1 parsing
AbstractQoreNode::custom_reference_handlers
bool custom_reference_handlers
set to one for objects that need custom reference handlers
Definition: AbstractQoreNode.h:339
AbstractQoreNode::derefImpl
virtual DLLEXPORT bool derefImpl(ExceptionSink *xsink)
decrements the reference count
AbstractQoreNode::getAsFloatImpl
virtual DLLLOCAL double getAsFloatImpl() const
default implementation, returns 0.0
Definition: AbstractQoreNode.h:284
AbstractQoreNode::eval
DLLEXPORT QoreValue eval(ExceptionSink *xsink) const
evaluates the object and returns a value (or 0)
AbstractQoreNode::eval
DLLEXPORT QoreValue eval(bool &needs_deref, ExceptionSink *xsink) const
optionally evaluates the argument
AbstractQoreNode::getAsIntImpl
virtual DLLLOCAL int getAsIntImpl() const
default implementation, returns 0
Definition: AbstractQoreNode.h:272
AbstractQoreNode::operator=
DLLLOCAL AbstractQoreNode & operator=(const AbstractQoreNode &)
this function is not implemented; it is here as a private function in order to prohibit it from being...
AbstractQoreNode::AbstractQoreNode
DLLEXPORT AbstractQoreNode(const AbstractQoreNode &v)
copy constructor
AbstractQoreNode::getDateTimeRepresentation
virtual DLLEXPORT class DateTime * getDateTimeRepresentation(bool &del) const
returns the DateTime representation of this type (default implementation: returns ZeroDate,...
AbstractQoreNode::getType
DLLLOCAL qore_type_t getType() const
returns the data type
Definition: AbstractQoreNode.h:175
AbstractQoreNode::needs_eval_flag
bool needs_eval_flag
if this is true then the type can be evaluated
Definition: AbstractQoreNode.h:333
AbstractQoreNode::getDateTimeRepresentation
virtual DLLEXPORT void getDateTimeRepresentation(DateTime &dt) const
assigns the date representation of a value to the DateTime reference passed, default implementation d...
AbstractQoreNode::getAsString
virtual DLLEXPORT QoreString * getAsString(bool &del, int foff, ExceptionSink *xsink) const =0
returns a QoreString giving the verbose string representation of the value (including all contained v...
AbstractQoreNode::type
qore_type_t type
the type of the object
Definition: AbstractQoreNode.h:327
AbstractQoreNode::is_value
DLLLOCAL bool is_value() const
returns true if the node represents a value
Definition: AbstractQoreNode.h:223
AbstractQoreNode::isReferenceCounted
DLLLOCAL bool isReferenceCounted() const
returns true if the object is reference-counted
Definition: AbstractQoreNode.h:244
AbstractQoreNode::AbstractQoreNode
DLLEXPORT AbstractQoreNode(qore_type_t t, bool n_value, bool n_needs_eval, bool n_there_can_be_only_one=false, bool n_custom_reference_handlers=false)
constructor takes the type
AbstractQoreNode::getAsInt
DLLEXPORT int getAsInt() const
returns the integer value of the object
AbstractQoreNode::getAsBool
DLLEXPORT bool getAsBool() const
returns the boolean value of the object
AbstractQoreNode::evalImpl
virtual DLLEXPORT QoreValue evalImpl(bool &needs_deref, ExceptionSink *xsink) const =0
optionally evaluates the argument
AbstractQoreNode::customDeref
virtual DLLEXPORT void customDeref(ExceptionSink *xsink)
AbstractQoreNode::~AbstractQoreNode
virtual DLLEXPORT ~AbstractQoreNode()
default destructor does nothing
AbstractQoreNode::deref
DLLEXPORT void deref(ExceptionSink *xsink)
decrements the reference count and calls derefImpl() if there_can_be_only_one is false,...
AbstractQoreNode::getStringRepresentation
virtual DLLEXPORT QoreString * getStringRepresentation(bool &del) const
returns the value of the type converted to a string, default implementation: returns the empty string
AbstractQoreNode::getTypeName
virtual DLLEXPORT const char * getTypeName() const =0
returns the type name as a c string
AbstractQoreNode::is_equal_soft
virtual DLLEXPORT bool is_equal_soft(const AbstractQoreNode *v, ExceptionSink *xsink) const =0
tests for equality ("deep compare" including all contained values for container types) with possible ...
DateTime
Holds absolute and relative date/time values in Qore with precision to the microsecond.
Definition: DateTime.h:93
ExceptionSink
container for holding Qore-language exception information and also for registering a "thread_exit" ca...
Definition: ExceptionSink.h:48
QoreReferenceCounter
provides atomic reference counting to Qore objects
Definition: QoreReferenceCounter.h:44
QoreString
Qore's string type supported by the QoreEncoding class.
Definition: QoreString.h:93
SimpleQoreNode
The base class for all types in Qore expression trees that cannot throw an exception when deleted.
Definition: AbstractQoreNode.h:352
SimpleQoreNode::SimpleQoreNode
DLLLOCAL SimpleQoreNode(qore_type_t t, bool n_value, bool n_needs_eval, bool n_there_can_be_only_one=false)
constructor takes the type and value arguments
Definition: AbstractQoreNode.h:358
SimpleQoreNode::operator=
SimpleQoreNode & operator=(const SimpleQoreNode &)=delete
this function is not implemented
SimpleQoreNode::SimpleQoreNode
DLLLOCAL SimpleQoreNode(const SimpleQoreNode &v)
copy constructor
Definition: AbstractQoreNode.h:361
SimpleValueQoreNode
base class for simple value types
Definition: AbstractQoreNode.h:372
SimpleValueQoreNode::SimpleValueQoreNode
DLLLOCAL SimpleValueQoreNode(qore_type_t t, bool n_there_can_be_only_one=false)
creates the object by assigning the type code and setting the "value" flag, unsetting the "needs_eval...
Definition: AbstractQoreNode.h:375
SimpleValueQoreNode::evalImpl
virtual DLLEXPORT QoreValue evalImpl(bool &needs_deref, ExceptionSink *xsink) const
should never be called for value types
UniqueValueQoreNode
this class is for value types that will exists only once in the Qore library, reference counting is d...
Definition: AbstractQoreNode.h:389
UniqueValueQoreNode::UniqueValueQoreNode
DLLLOCAL UniqueValueQoreNode(qore_type_t t)
constructor takes the type argument
Definition: AbstractQoreNode.h:398
UniqueValueQoreNode::realCopy
virtual DLLEXPORT AbstractQoreNode * realCopy() const
returns itself; objects of this type are not reference-counted and only deleted manually (by static d...
UniqueValueQoreNode::UniqueValueQoreNode
DLLLOCAL UniqueValueQoreNode(const UniqueValueQoreNode &)
copy constructor
Definition: AbstractQoreNode.h:401
UniqueValueQoreNode::operator=
DLLLOCAL UniqueValueQoreNode & operator=(const UniqueValueQoreNode &)=delete
this function is not implemented
common.h
qore_type_t
int16_t qore_type_t
used to identify unique Qore data and parse types (descendents of AbstractQoreNode)
Definition: common.h:70
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:260
node_types.h
QoreValue
The main value class in Qore, designed to be passed by value.
Definition: QoreValue.h:276