rule_macros.h

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// SPDX-FileCopyrightText: 2025-2026 Metehan Selvi <me@metehanselvi.com>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
 
#ifndef RDESC_RULE_MACROS_H
#define RDESC_RULE_MACROS_H
 
 
#ifndef PREFIX_TK
#define PREFIX_TK(tk) TK_ ## tk
#endif
 
#ifndef PREFIX_NT
#define PREFIX_NT(nt) NT_ ## nt
#endif
 
#ifndef POSTFIX_NT_REST
#define POSTFIX_NT_REST(nt) nt ## _REST
#endif
 
#define EOA -1
#define EOP -2
 
#define SEOA { .ty = RDESC_SENTINEL, .id = EOA }
#define SEOP { { .ty = RDESC_SENTINEL, .id = EOP } }
#define TK(tk) { .ty = RDESC_TOKEN, .id = PREFIX_TK(tk) }
#define NT(nt) { .ty = RDESC_NONTERMINAL, .id = PREFIX_NT(nt) }
 
#define EPSILON SEOA
 
 
#define r(...) { { __VA_ARGS__, SEOA }, SEOP }
 
#define ropt(...) \
        r(__VA_ARGS__ alt EPSILON)
 
#define rrr(head, base, suffix) \
        r(_rdesc_priv_trim_paren base, NT(POSTFIX_NT_REST(head))), \
        ropt(_rdesc_priv_trim_paren suffix, NT(POSTFIX_NT_REST(head)))
 
#define alt , SEOA, }, {
 
#define _rdesc_priv_trim_paren(...) __VA_ARGS__
#endif