hlp_context.h

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//  hlp_context.h
//
//  Author: Eric Nivel
//
//  BSD license:
//  Copyright (c) 2010, Eric Nivel
//  All rights reserved.
//  Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are met:
//
//   - Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
//   - Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
//   - Neither the name of Eric Nivel nor the
//     names of their contributors may be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
//  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//  DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
//  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
//  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
//  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
//  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef hlp_context_h
#define hlp_context_h

#include "../r_code/object.h"

#include "_context.h"
#include "hlp_overlay.h"


namespace r_exec {

class dll_export HLPContext:
    public _Context {
public:
    HLPContext();
    HLPContext(Atom *code, uint16_t index, HLPOverlay *const overlay, Data data = STEM);

    HLPContext operator *() const;

    HLPContext &operator =(const HLPContext &c) {

        code = c.code;
        index = c.index;
        return *this;
    }

    Atom &operator [](uint16_t i) const {
        return code[index + i];
    }

    bool operator ==(const HLPContext &c) const;
    bool operator !=(const HLPContext &c) const;

    HLPContext getChild(uint16_t index) const {

        return HLPContext(code, this->index + index, (HLPOverlay *)overlay);
    }

    bool evaluate(uint16_t &result_index) const; // index is set to the index of the result, undefined in case of failure.
    bool evaluate_no_dereference(uint16_t &result_index) const;

// __Context implementation.
    _Context *assign(const _Context *c) {

        HLPContext *_c = new HLPContext(*(HLPContext *)c);
        return _c;
    }

    bool equal(const _Context *c) const {
        return *this == *(HLPContext *)c;
    }

    Atom &get_atom(uint16_t i) const {
        return this->operator [](i);
    }

    uint16_t get_object_code_size() const;

    uint16_t getChildrenCount() const {

        return code[index].getAtomCount();
    }
    _Context *_getChild(uint16_t index) const {

        HLPContext *_c = new HLPContext(getChild(index));
        return _c;
    }

    _Context *dereference() const {

        HLPContext *_c = new HLPContext(**this);
        return _c;
    }
};
}


#endif