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#ifndef MLIB_MBSTRING_H
#define MLIB_MBSTRING_H
#include <stddef.h>
#include "_charN_t.h"
#include "_rune.h"
#include "_uNview.h"
#define U8(...) \
((struct u8view){__VA_OPT__(u8##__VA_ARGS__, sizeof(u8##__VA_ARGS__) - 1)})
#define U16(...) \
((struct u16view){__VA_OPT__(u##__VA_ARGS__, sizeof(u##__VA_ARGS__) - 1)})
#define U32(...) \
((struct u32view){__VA_OPT__(U##__VA_ARGS__, sizeof(U##__VA_ARGS__) - 1)})
/* clang-format off */
#define U8C(s) {u8##s, sizeof(u8##s) - 1}
#define U16C(s) { u##s, sizeof (u##s) - 1}
#define U32C(s) { U##s, sizeof (U##s) - 1}
/* clang-format on */
#define VSHFT(sv, n) ((sv)->p += (n), (sv)->len -= (n))
/* clang-format off */
#define u8byte1(x) (((x) & 0x80) == 0x00)
#define u8byte2(x) (((x) & 0xE0) == 0xC0)
#define u8byte3(x) (((x) & 0xF0) == 0xE0)
#define u8byte4(x) (((x) & 0xF8) == 0xF0)
#define u8bytec(x) (((x) & 0xC0) == 0x80)
/* clang-format on */
constexpr int U8_LEN_MAX = 4;
constexpr rune U8_1B_MAX = 0x00007F;
constexpr rune U8_2B_MAX = 0x0007FF;
constexpr rune U8_3B_MAX = 0x00FFFF;
constexpr rune U8_4B_MAX = 0x10FFFF;
constexpr rune MBEND = 0x110000;
#define PRIsSV ".*s"
#define SV_PRI_ARGS(sv) ((int)(sv).len), ((sv).p)
int rtou8(char8_t *, size_t, rune);
int u8next(rune *, struct u8view *);
int u8prev(rune *, const char8_t **, const char8_t *);
int u8tor(rune *, const char8_t *);
[[nodiscard]] bool u8haspfx(struct u8view, struct u8view);
[[nodiscard]] bool u8hassfx(struct u8view, struct u8view);
[[nodiscard]] const char8_t *u8chk(struct u8view);
[[nodiscard]] const char8_t *u8chr(struct u8view, rune);
[[nodiscard]] const char8_t *u8rchr(struct u8view, rune);
[[nodiscard]] int u8cmp(struct u8view, struct u8view);
[[nodiscard]] size_t u8cspn(struct u8view, const rune *, size_t);
[[nodiscard]] size_t u8len(struct u8view);
[[nodiscard]] size_t u8spn(struct u8view, const rune *, size_t);
rune u8cut(struct u8view *restrict, struct u8view *restrict, const rune *,
size_t);
/* Encoding-generic macros */
#define rtoucs(buf, bufsz, ch) \
_Generic((buf), char8_t *: rtou8)((buf), (bufsz), (ch))
#define ucsnext(ch, sv) _Generic((sv), struct u8view *: u8next)((ch), (sv))
#define ucsprev(ch, p, start) \
_Generic((p), const char8_t **: u8prev)((ch), (p), (start))
#define ucstor(ch, p) \
_Generic((p), char8_t *: u8tor, const char8_t *: u8tor)((ch), (p))
#define ucshaspfx(sv, pfx) _Generic((sv), struct u8view: u8haspfx)((sv), (pfx))
#define ucshassfx(sv, sfx) _Generic((sv), struct u8view: u8hassfx)((sv), (sfx))
#define ucschk(sv) _Generic((sv), struct u8view: u8chk)((sv))
#define ucschr(sv, ch) _Generic((sv), struct u8view: u8chr)((sv), (ch))
#define ucsrchr(sv, ch) _Generic((sv), struct u8view: u8rchr)((sv), (ch))
#define ucscmp(lhs, rhs) _Generic((lhs), struct u8view: u8cmp)((lhs), (rhs))
#define ucscspn(sv, delims, ndelims) \
_Generic((sv), struct u8view: u8cspn)((sv), (delims), (ndelims))
#define ucslen(sv) _Generic((sv), struct u8view: u8len)((sv))
#define ucsspn(sv, delims, ndelims) \
_Generic((sv), struct u8view: u8spn)((sv), (delims), (ndelims))
#define ucscut(x, y, seps, nseps) \
_Generic((y), struct u8view *: u8cut)(x, y, seps, nseps)
#endif /* !MLIB_MBSTRING_H */
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