#pragma once

enum {
	Runeself = 0x80,
	Runeerror = 0xfffd,
	Runemax = 0x10ffff,
	Runemask = 0x1fffff,
	UTFmax = 4,
};

typedef u32int Rune;

int chartorune(Rune *rune, const char *str) sl_nonnull(1, 2) sl_wr(1) sl_cstr(2) sl_rd(2);
int runetochar(char *str, const Rune *rune) sl_nonnull(1, 2) sl_wr(1) sl_rd(2);
int fullrune(const char *str, int n) sl_purefn sl_nonnull(1) sl_rd(1, 2);
int runelen(Rune c) sl_constfn;
Rune tolowerrune(Rune c) sl_constfn;
Rune toupperrune(Rune c) sl_constfn;
Rune totitlerune(Rune c) sl_constfn;
int islowerrune(Rune c) sl_constfn;
int isupperrune(Rune c) sl_constfn;
int isalpharune(Rune c) sl_constfn;
int istitlerune(Rune c) sl_constfn;
int isspacerune(Rune c) sl_constfn;
int isdigitrune(Rune c) sl_constfn;

int utfnlen(const char *s, long m) sl_nonnull(1) sl_rd(1, 2);

enum { Maxnormctx = 1+30 };
typedef struct Norm Norm;
struct Norm {
	long (*getrune)(void*);
	void *ctx;

	struct {
		Rune *e;
		Rune a[Maxnormctx];
	}ibuf, obuf;

	int compose;
};

void norminit(Norm*, int, void*, long (*getrune)(void*));
long normpull(Norm*, Rune*, long, int);
long runecomp(Rune*, long, Rune*, long);
long runedecomp(Rune*, long, Rune*, long);
long utfcomp(char*, long, char*, long);
long utfdecomp(char*, long, char*, long);

const Rune *runewbreak(const Rune*) sl_purefn;
const char *utfwbreak(const char*) sl_cstr(1);
const Rune *runegbreak(const Rune*) sl_purefn;
const char *utfgbreak(const char*) sl_cstr(1);