#pragma once

#include "../Common.h"

NS_BF_BEGIN;

/* is c the start of a utf8 sequence? */
#define isutf(c) (((c)&0xC0)!=0x80)

/* convert UTF-8 data to wide character */
int u8_toucs(wchar_t *dest, int sz, char *src, int srcsz);

uint32 u8_toucs(const char* src, int srcsz, int* outLen = NULL);

/* the opposite conversion */
int u8_toutf8(char *dest, int sz, wchar_t *src, int srcsz);

/* the opposite conversion */
int u8_toutf8(char *dest, int sz, uint32 ch);

/* single character to UTF-8 */
int u8_wc_toutf8(char *dest, uint32 ch);

/* character number to byte offset */
int u8_offset(char *str, int charnum);

/* byte offset to character number */
int u8_charnum(char *s, int offset);

/* return next character, updating an index variable */
uint32 u8_nextchar(char *s, int *i);

/* move to next character */
void u8_inc(char *s, int *i);

/* move to previous character */
void u8_dec(char *s, int *i);

/* returns length of next utf-8 sequence */
int u8_seqlen(char *s);

int u8_seqlen(uint32 ch);

/* assuming src points to the character after a backslash, read an
 escape sequence, storing the result in dest and returning the number of
 input characters processed */
int u8_read_escape_sequence(char *src, uint32 *dest);

/* given a wide character, convert it to an ASCII escape sequence stored in
 buf, where buf is "sz" bytes. returns the number of characters output. */
int u8_escape_wchar(char *buf, int sz, uint32 ch);

/* convert a string "src" containing escape sequences to UTF-8 */
int u8_unescape(char *buf, int sz, char *src);

/* convert UTF-8 "src" to ASCII with escape sequences.
 if escape_quotes is nonzero, quote characters will be preceded by
 backslashes as well. */
int u8_escape(char *buf, int sz, char *src, int escape_quotes);

/* utility predicates used by the above */
int octal_digit(char c);
int hex_digit(char c);

/* return a pointer to the first occurrence of ch in s, or NULL if not
 found. character index of found character returned in *charn. */
char *u8_strchr(char *s, uint32 ch, int *charn);

/* same as the above, but searches a buffer of a given size instead of
 a NUL-terminated string. */
char *u8_memchr(char *s, uint32 ch, size_t sz, int *charn);

/* count the number of characters in a UTF-8 string */
int u8_strlen(char *s);

int u8_is_locale_utf8(char *locale);

/* printf where the format string and arguments may be in UTF-8.
 you can avoid this function and just use ordinary printf() if the current
 locale is UTF-8. */
int u8_vprintf(char *fmt, va_list ap);
int u8_printf(char *fmt, ...);

bool UTF8IsCombiningMark(uint32 c);
bool UTF8GetGraphemeClusterSpan(const char* str, int strLength, int idx, int& startIdx, int& spanLength);
void UTF8Categorize(const char* str, int strLength, int& numCodePoints, int& numCombiningMarks);

NS_BF_END;
