#pragma once

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

typedef u32int Rune;

int chartorune(Rune *rune, const char *str);
int runetochar(char *str, const Rune *rune);
int runenlen(const Rune *r, int nrune) sl_purefn;
int fullrune(const char *str, int n) sl_purefn;
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);

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

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