if_control.h

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#ifndef IF_CONTROL_H
#define IF_CONTROL_H
#pragma once
/***************************************************************************
 *   Copyright (C) 2004, 2006 Symbian Software Ltd.                        *
 *   All rights reserved.                                                  *
 *   Copyright (C) 2002, 2003 Tony Finch <dot@dotat.at>.                   *
 *   All rights reserved.                                                  *
 *   Copyright (C) 1985, 1993 The Regents of the University of California. *
 *   All rights reserved.                                                  *
 *   Copyright (C) 2007-2013 Mike Kinghan, imk@burroingroingjoing.com      *
 *   All rights reserved.                                                  *
 *                                                                         *
 *   Contributed by Mike Kinghan, imk@burroingroingjoing.com,              *
 *   derived from the code of Tony Finch                                   *
 *                                                                         *
 *   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 Symbian Software Ltd. nor the names of its        *
 *   contributors may be used to endorse or promote products derived from  *
 *   this software without specific prior written permission.              *
 *                                                                         *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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        *
 *   COPYRIGHT OWNER OR 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 *
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 *   DAMAGE.                                                               *
 *                                                                         *
 **************************************************************************/
#include "line_type.h"
#include <cstddef>

struct if_control {

        enum if_state {
            IF_STATE_OUTSIDE,
            IF_STATE_FALSE_PREFIX,
            IF_STATE_TRUE_PREFIX,
            IF_STATE_PASS_MIDDLE,
            IF_STATE_FALSE_MIDDLE,
            IF_STATE_TRUE_MIDDLE,
            IF_STATE_PASS_ELSE,
            IF_STATE_FALSE_ELSE,
            IF_STATE_TRUE_ELSE,
            IF_STATE_FALSE_TRAILER,
            IF_STATE_COUNT
        };

        static void transition(line_type linetype);

        static bool dead_line();

        static bool was_unconditional_line() {
                return ifstate[if_depth()] == IF_STATE_OUTSIDE;
        }

        static bool is_unconditional_line();

        static size_t if_start_line() {
                return if_start_lines[if_depth()];
        }

        static size_t if_depth() {
                return depth;
        }

        static if_state state() {
                return ifstate[if_depth()];
        }

        static void top() {
                depth = 0;
        }

private:

    static const unsigned MAXDEPTH = 64;

        using transition_t = void();

        static transition_t * const transition_table[IF_STATE_COUNT][LT_SENTINEL];

        static void nest();

        static void set_state(if_state is) {
                size_t deep = if_depth();
                ifstate[deep] = is;
        }

        static void Strue();

        static void Sfalse();

        static void Selse();

        static void Pelif();

        static void Pelse();

        static void Pendif();

        static void Dfalse();

        static void Delif();

        static void Delse();

        static void Dendif();

        static void Fdrop() {
                nest();
                Dfalse();
        }

        static void Fpass() {
                nest();
                Pelif();
        }

        static void Ftrue() {
                nest();
                Strue();
        }

        static void Ffalse() {
                nest();
                Sfalse();
        }

        static void Mpass();

        static void Mtrue();

        static void Melif();

        static void Melse();

        static void orphan_elif();

        static void orphan_else();

        static void orphan_endif();

        static void early_eof();

        static if_state ifstate[MAXDEPTH];

        static size_t           depth;

        static size_t           if_start_lines[MAXDEPTH];

};

#endif // EOF