QoreNullCoalescingOperatorNode.h

/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
    QoreNullCoalescingOperatorNode.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
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    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
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*/
 
#ifndef _QORE_QORENULLCOALESCINGOPERATORNODE_H
#define _QORE_QORENULLCOALESCINGOPERATORNODE_H
 
class QoreNullCoalescingOperatorNode : public QoreBinaryOperatorNode<QoreOperatorNode> {
protected:
    static QoreString null_coalescing_str;
 
    const QoreTypeInfo* typeInfo = nullptr;
 
    DLLLOCAL virtual int parseInitImpl(QoreValue& val, QoreParseContext& parse_context);
 
    DLLLOCAL virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const;
 
public:
    DLLLOCAL QoreNullCoalescingOperatorNode(const QoreProgramLocation* loc, QoreValue e0, QoreValue e1)
            : QoreBinaryOperatorNode<QoreOperatorNode>(loc, e0, e1) {
    }
 
    DLLLOCAL virtual QoreString* getAsString(bool& del, int foff, ExceptionSink* xsink) const;
 
    DLLLOCAL virtual int getAsString(QoreString& str, int foff, ExceptionSink* xsink) const;
 
    DLLLOCAL virtual const QoreTypeInfo *getTypeInfo() const {
        return typeInfo;
    }
 
    // returns the type name as a c string
    DLLLOCAL virtual const char* getTypeName() const {
        return null_coalescing_str.getBuffer();
    }
 
    DLLLOCAL virtual QoreOperatorNode* copyBackground(ExceptionSink* xsink) const {
        return copyBackgroundExplicit<QoreNullCoalescingOperatorNode>(xsink);
    }
};
 
#endif