cst_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_CST_MACROS_H
#define RDESC_CST_MACROS_H
 
#include "detail.h"  // IWYU pragma: export (for _rdesc_priv_node_deref)
 
#include <stddef.h>
 
struct rdesc;  /* defined in rdesc.h */
 
 
#define _rdesc_priv_node_deref(node) (*(struct _rdesc_priv_node *) (node))
 
/* Returns index of parent of the node, or `SIZE_MAX` if the node is root. */
#define _rdesc_priv_parent_idx(node) _rdesc_priv_node_deref(node).parent
 
/* Returns index of the child in stack. */
#define _rdesc_priv_child_idx(nt_node, child_index) \
        (*(size_t *) (&((uint8_t *) ((struct _rdesc_priv_node *) nt_node + 1)) \
                [(child_index) * sizeof(size_t)]))
 
#ifdef __cplusplus
extern "C"
#endif
struct rdesc_node *_rdesc_priv_cst_illegal_access(const struct rdesc *parser,
                                                  size_t index);
#endif
 
 
#ifndef RDESC_CST_MACROS
#define RDESC_CST_MACROS
#define rparent(p, node) \
        _rdesc_priv_cst_illegal_access(p, _rdesc_priv_parent_idx(node))
 
#define rtype(node) _rdesc_priv_node_deref(node).n.ty
 
#define rid(node) _rdesc_priv_node_deref(node).n.nt.id
 
#define ralt_idx(nt_node) \
        _rdesc_priv_node_deref(nt_node).n.nt.alt_idx
 
#define ralt_id(nt_node) ralt_idx(nt_node)
 
#define rseminfo(tk_node) \
        ((void *) &_rdesc_priv_node_deref(tk_node).n.tk.seminfo)
 
#define rchild_count(nt_node) \
        _rdesc_priv_node_deref(nt_node).n.nt.child_count
 
#define rchild(p, nt_node, child_idx) \
        _rdesc_priv_cst_illegal_access(p, _rdesc_priv_child_idx(nt_node, child_idx))
 
#else
#undef RDESC_CST_MACROS
 
#undef rparent
 
#undef rtype
 
#undef rid
 
#undef rseminfo
 
#undef ralt_idx
 
#undef ralt_id
 
#undef rchild_count
 
#undef rchild
 
#endif