/*
 * TSM - Unicode Handling
 *
 * Copyright (c) 2011-2012 David Herrmann <dh.herrmann@googlemail.com>
 * Copyright (c) 2011 University of Tuebingen
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * Unicode Helpers
 * This file provides small helpers to make working with Unicode/UTF8/UCS4 input
 * and output much easier.
 */

#ifndef KMSCON_UNICODE_H
#define KMSCON_UNICODE_H

#include <inttypes.h>
#include <stdlib.h>

/* UCS4 helpers */

#define TSM_UCS4_MAX (0x7fffffffUL)
#define TSM_UCS4_INVALID (TSM_UCS4_MAX + 1)
#define TSM_UCS4_REPLACEMENT (0xfffdUL)
#define TSM_UCS4_MAXLEN 10

/* symbols */

struct tsm_symbol_table;
typedef uint32_t tsm_symbol_t;

extern const tsm_symbol_t tsm_symbol_default;

int tsm_symbol_table_new(struct tsm_symbol_table **out);
void tsm_symbol_table_ref(struct tsm_symbol_table *tbl);
void tsm_symbol_table_unref(struct tsm_symbol_table *tbl);

tsm_symbol_t tsm_symbol_make(uint32_t ucs4);
tsm_symbol_t tsm_symbol_append(struct tsm_symbol_table *tbl,
			       tsm_symbol_t sym, uint32_t ucs4);
const uint32_t *tsm_symbol_get(struct tsm_symbol_table *tbl,
			       tsm_symbol_t *sym, size_t *size);

/* ucs4 to utf8 converter */

size_t tsm_ucs4_to_utf8(uint32_t ucs4, char *out);
char *tsm_ucs4_to_utf8_alloc(const uint32_t *ucs4, size_t len, size_t *len_out);

/* utf8 state machine */

struct tsm_utf8_mach;

enum tsm_utf8_mach_state {
	TSM_UTF8_START,
	TSM_UTF8_ACCEPT,
	TSM_UTF8_REJECT,
	TSM_UTF8_EXPECT1,
	TSM_UTF8_EXPECT2,
	TSM_UTF8_EXPECT3,
};

int tsm_utf8_mach_new(struct tsm_utf8_mach **out);
void tsm_utf8_mach_free(struct tsm_utf8_mach *mach);

int tsm_utf8_mach_feed(struct tsm_utf8_mach *mach, char c);
uint32_t tsm_utf8_mach_get(struct tsm_utf8_mach *mach);
void tsm_utf8_mach_reset(struct tsm_utf8_mach *mach);

#endif /* KMSCON_UNICODE_H */