Qore Programming Language  0.9.4.6
AbstractQoreNode.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3  AbstractQoreNode.h
4 
5  Qore Programming Language
6 
7  Copyright (C) 2003 - 2018 Qore Technologies, s.r.o.
8 
9  Permission is hereby granted, free of charge, to any person obtaining a
10  copy of this software and associated documentation files (the "Software"),
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14  Software is furnished to do so, subject to the following conditions:
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16  The above copyright notice and this permission notice shall be included in
17  all copies or substantial portions of the Software.
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19  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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26 
27  Note that the Qore library is released under a choice of three open-source
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29  information.
30 */
31 
32 #ifndef _QORE_ABSTRACTQORENODE_H
33 
34 #define _QORE_ABSTRACTQORENODE_H
35 
36 #include <qore/common.h>
37 #include <qore/QoreReferenceCounter.h>
38 #include <qore/node_types.h>
39 
40 #include <string>
41 
42 #include <cassert>
43 
44 #define FMT_YAML_SHORT -2
45 #define FMT_NONE -1
46 #define FMT_NORMAL 0
47 
48 class LocalVar;
49 
51 
55 public:
57 
64  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);
65 
67  DLLEXPORT AbstractQoreNode(const AbstractQoreNode& v);
68 
70 
73  DLLEXPORT bool getAsBool() const;
74 
76 
79  DLLEXPORT int getAsInt() const;
80 
82 
85  DLLEXPORT int64 getAsBigInt() const;
86 
88 
91  DLLEXPORT double getAsFloat() const;
92 
94 
99  DLLEXPORT virtual QoreString* getStringRepresentation(bool& del) const;
100 
102 
105  DLLEXPORT virtual void getStringRepresentation(QoreString &str) const;
106 
108 
112  DLLEXPORT virtual class DateTime* getDateTimeRepresentation(bool& del) const;
113 
115 
118  DLLEXPORT virtual void getDateTimeRepresentation(DateTime &dt) const;
119 
121 
127  DLLEXPORT virtual int getAsString(QoreString &str, int foff, ExceptionSink* xsink) const = 0;
128 
130 
136  DLLEXPORT virtual QoreString *getAsString(bool& del, int foff, ExceptionSink* xsink) const = 0;
137 
139 
142  DLLLOCAL bool needs_eval() const {
143  return needs_eval_flag;
144  }
145 
147 
150  DLLEXPORT virtual AbstractQoreNode* realCopy() const = 0;
151 
153 
158  DLLEXPORT virtual bool is_equal_soft(const AbstractQoreNode* v, ExceptionSink* xsink) const = 0;
159 
161 
166  DLLEXPORT virtual bool is_equal_hard(const AbstractQoreNode* v, ExceptionSink* xsink) const = 0;
167 
169 
172  DLLLOCAL qore_type_t getType() const {
173  return type;
174  }
175 
177 
180  DLLEXPORT virtual const char* getTypeName() const = 0;
181 
183 
199  DLLEXPORT QoreValue eval(ExceptionSink* xsink) const;
200 
202 
214  DLLEXPORT QoreValue eval(bool& needs_deref, ExceptionSink* xsink) const;
215 
217 
220  DLLLOCAL bool is_value() const {
221  return value;
222  }
223 
225 
229  DLLEXPORT void deref(ExceptionSink* xsink);
230 
232 
235  DLLEXPORT AbstractQoreNode* refSelf() const;
236 
238  DLLEXPORT void ref() const;
239 
241  DLLLOCAL bool isReferenceCounted() const { return !there_can_be_only_one; }
242 
244 
251  DLLLOCAL virtual void parseInit(QoreValue& val, LocalVar* oflag, int pflag, int& lvids, const QoreTypeInfo*& typeInfo);
252 
254  DLLLOCAL AbstractQoreNode& operator=(const AbstractQoreNode&);
255 
257 
260  DLLLOCAL virtual bool getAsBoolImpl() const { return false; }
261 
263 
266  DLLLOCAL virtual int getAsIntImpl() const { return 0; }
267 
269 
272  DLLLOCAL virtual int64 getAsBigIntImpl() const { return 0; }
273 
275 
278  DLLLOCAL virtual double getAsFloatImpl() const { return 0.0; }
279 
281 
293  DLLEXPORT virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const = 0;
294 
296 
301  DLLEXPORT virtual bool derefImpl(ExceptionSink* xsink);
302 
304 
308  DLLEXPORT virtual void customRef() const;
309 
314  DLLEXPORT virtual void customDeref(ExceptionSink* xsink);
315 
316 protected:
318 
322 
324  bool value : 1;
325 
327  bool needs_eval_flag : 1;
328 
331 
334 
336 
339  DLLEXPORT virtual ~AbstractQoreNode();
340 };
341 
343 
347 public:
349  SimpleQoreNode& operator=(const SimpleQoreNode&) = delete;
350 
352  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) { }
353 
355  DLLLOCAL SimpleQoreNode(const SimpleQoreNode& v) : AbstractQoreNode(v) { }
356 
358 
362  DLLEXPORT void deref();
363 };
364 
367 public:
369  DLLLOCAL SimpleValueQoreNode(qore_type_t t, bool n_there_can_be_only_one = false) : SimpleQoreNode(t, true, false, n_there_can_be_only_one) { }
370 
371  DLLLOCAL SimpleValueQoreNode(const SimpleValueQoreNode& v) : SimpleQoreNode(v) { }
372 
373 protected:
375 
377  DLLEXPORT virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const;
378 };
379 
381 
384 public:
386  DLLLOCAL UniqueValueQoreNode& operator=(const UniqueValueQoreNode&) = delete;
387 
389  DLLLOCAL void *operator new(size_t) = delete;
390 
393 
396 
398  DLLEXPORT virtual AbstractQoreNode* realCopy() const;
399 };
400 
401 #endif
virtual DLLEXPORT void customRef() const
special processing when the object&#39;s reference count transitions from 0-1
DLLLOCAL qore_type_t getType() const
returns the data type
Definition: AbstractQoreNode.h:172
virtual DLLEXPORT QoreString * getStringRepresentation(bool &del) const
returns the value of the type converted to a string, default implementation: returns the empty string...
virtual DLLLOCAL double getAsFloatImpl() const
default implementation, returns 0.0
Definition: AbstractQoreNode.h:278
DLLEXPORT int getAsInt() const
returns the integer value of the object
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...
DLLLOCAL bool is_value() const
returns true if the node represents a value
Definition: AbstractQoreNode.h:220
DLLEXPORT bool getAsBool() const
returns the boolean value of the object
Holds absolute and relative date/time values in Qore with precision to the microsecond.
Definition: DateTime.h:93
The base class for all value and parse types in Qore expression trees.
Definition: AbstractQoreNode.h:54
virtual DLLLOCAL void parseInit(QoreValue &val, LocalVar *oflag, int pflag, int &lvids, const QoreTypeInfo *&typeInfo)
for use by parse types to initialize them for execution during stage 1 parsing; not exported in the l...
virtual DLLEXPORT bool derefImpl(ExceptionSink *xsink)
decrements the reference count
DLLEXPORT QoreValue eval(ExceptionSink *xsink) const
evaluates the object and returns a value (or 0)
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...
virtual DLLLOCAL bool getAsBoolImpl() const
default implementation, returns false
Definition: AbstractQoreNode.h:260
DLLEXPORT AbstractQoreNode * refSelf() const
returns "this" with an incremented reference count
virtual DLLEXPORT const char * getTypeName() const =0
returns the type name as a c string
Qore&#39;s string type supported by the QoreEncoding class.
Definition: QoreString.h:81
bool custom_reference_handlers
set to one for objects that need custom reference handlers
Definition: AbstractQoreNode.h:333
bool needs_eval_flag
if this is true then the type can be evaluated
Definition: AbstractQoreNode.h:327
this class is for value types that will exists only once in the Qore library, reference counting is d...
Definition: AbstractQoreNode.h:383
provides atomic reference counting to Qore objects
Definition: QoreReferenceCounter.h:44
virtual DLLEXPORT void customDeref(ExceptionSink *xsink)
The main value class in Qore, designed to be passed by value.
Definition: QoreValue.h:262
virtual DLLEXPORT class DateTime * getDateTimeRepresentation(bool &del) const
returns the DateTime representation of this type (default implementation: returns ZeroDate...
virtual DLLEXPORT AbstractQoreNode * realCopy() const =0
returns a copy of the object; the caller owns the reference count
DLLEXPORT int64 getAsBigInt() const
returns the 64-bit integer value of the object
DLLLOCAL AbstractQoreNode & operator=(const AbstractQoreNode &)
this function is not implemented; it is here as a private function in order to prohibit it from being...
The base class for all types in Qore expression trees that cannot throw an exception when deleted...
Definition: AbstractQoreNode.h:346
container for holding Qore-language exception information and also for registering a "thread_exit" ca...
Definition: ExceptionSink.h:46
virtual DLLEXPORT QoreValue evalImpl(bool &needs_deref, ExceptionSink *xsink) const =0
optionally evaluates the argument
DLLEXPORT void deref(ExceptionSink *xsink)
decrements the reference count and calls derefImpl() if there_can_be_only_one is false, otherwise does nothing
DLLLOCAL bool needs_eval() const
returns true if the object needs evaluation to return a value, false if not
Definition: AbstractQoreNode.h:142
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
DLLEXPORT void ref() const
increments the reference count
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
DLLEXPORT double getAsFloat() const
returns the float value of the object
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:330
int16_t qore_type_t
used to identify unique Qore data and parse types (descendents of AbstractQoreNode) ...
Definition: common.h:70
virtual DLLLOCAL int getAsIntImpl() const
default implementation, returns 0
Definition: AbstractQoreNode.h:266
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:324
virtual DLLEXPORT ~AbstractQoreNode()
default destructor does nothing
base class for simple value types
Definition: AbstractQoreNode.h:366
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 ...
DLLLOCAL bool isReferenceCounted() const
returns true if the object is reference-counted
Definition: AbstractQoreNode.h:241
qore_type_t type
the type of the object
Definition: AbstractQoreNode.h:321
virtual DLLLOCAL int64 getAsBigIntImpl() const
default implementation, returns 0
Definition: AbstractQoreNode.h:272