/* -*- mode: c++; indent-tabs-mode: nil -*- */
/*
    ObjectMethodReference.h

    Qore Programming Language

    Copyright (C) 2003 - 2023 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_OBJECTMETHODREFERENCE_H

#define _QORE_OBJECTMETHODREFERENCE_H

#include <string>

class AbstractParseObjectMethodReferenceNode : public ParseNode {
protected:
   //! optionally evaluates the argument
   /** return value requires a deref(xsink) if needs_deref is true
       @see AbstractQoreNode::eval()
   */
   DLLLOCAL virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const = 0;

public:
   DLLLOCAL AbstractParseObjectMethodReferenceNode(const QoreProgramLocation* loc) : ParseNode(loc, NT_OBJMETHREF) {
   }

   DLLLOCAL virtual ~AbstractParseObjectMethodReferenceNode() {
   }

   DLLLOCAL virtual int getAsString(QoreString& str, int foff, ExceptionSink* xsink) const {
      str.sprintf("object method reference (%p)", this);
      return 0;
   }

   // if del is true, then the returned QoreString*  should be deleted, if false, then it must not be
   DLLLOCAL virtual QoreString* getAsString(bool& del, int foff, ExceptionSink* xsink) const {
      del = true;
      QoreString* rv = new QoreString;
      getAsString(*rv, foff, xsink);
      return rv;
   }

   // returns the type name as a c string
   DLLLOCAL virtual const char* getTypeName() const {
      return "object method reference";
   }
};

class ParseObjectMethodReferenceNode : public AbstractParseObjectMethodReferenceNode {
private:
    QoreValue exp;
    std::string method;
    const QoreClass *qc;
    mutable const QoreMethod* m;
    mutable QoreThreadLock lck;

    DLLLOCAL virtual ~ParseObjectMethodReferenceNode();

    DLLLOCAL virtual const QoreTypeInfo* getTypeInfo() const {
        return callReferenceTypeInfo;
    }

protected:
    //! optionally evaluates the argument
    /** return value requires a deref(xsink) if needs_deref is true
        @see AbstractQoreNode::eval()
    */
    DLLLOCAL virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const;

public:
    DLLLOCAL ParseObjectMethodReferenceNode(const QoreProgramLocation* loc, QoreValue n_exp, char* n_method);
    DLLLOCAL virtual int parseInitImpl(QoreValue& val, QoreParseContext& parse_context);
};

class ParseSelfMethodReferenceNode : public AbstractParseObjectMethodReferenceNode {
private:
    std::string method;
    const QoreMethod* meth;

    DLLLOCAL ~ParseSelfMethodReferenceNode() {
    }

    DLLLOCAL virtual int parseInitImpl(QoreValue& val, QoreParseContext& parse_context);

    DLLLOCAL virtual const QoreTypeInfo* getTypeInfo() const {
        return callReferenceTypeInfo;
    }

protected:
    // returns a RunTimeObjectMethodReference or NULL if there's an exception
    DLLLOCAL virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const;

public:
    DLLLOCAL ParseSelfMethodReferenceNode(const QoreProgramLocation* loc, char* n_method)
            : AbstractParseObjectMethodReferenceNode(loc), method(n_method), meth(0) {
        free(n_method);
    }

    DLLLOCAL ParseSelfMethodReferenceNode(const QoreProgramLocation* loc, const QoreMethod* m)
            : AbstractParseObjectMethodReferenceNode(loc), meth(m) {
    }
};

class ParseScopedSelfMethodReferenceNode : public AbstractParseObjectMethodReferenceNode {
private:
    NamedScope *nscope;
    const QoreMethod* method;

    DLLLOCAL virtual ~ParseScopedSelfMethodReferenceNode();

protected:
    // returns a RunTimeObjectMethodReference or NULL if there's an exception
    DLLLOCAL virtual QoreValue evalImpl(bool& needs_deref, ExceptionSink* xsink) const;

    DLLLOCAL virtual int parseInitImpl(QoreValue& val, QoreParseContext& parse_context);
    DLLLOCAL virtual const QoreTypeInfo* getTypeInfo() const {
        return callReferenceTypeInfo;
    }

public:
    DLLLOCAL ParseScopedSelfMethodReferenceNode(const QoreProgramLocation* loc, NamedScope *n_nscope);
};

#endif
