/* See LICENSE file for copyright and license details. */
#include "lib-common.h"


enum libcharconv_result
libcharconv_bracketed(const char *s, size_t slen, size_t *n, uint_least32_t *cp, size_t *ncp)
{
	uint_least32_t c;
	*n = 0;
	for (; slen--; s++) {
		if ('0' <= s[0] && s[0] <= '9') {
			if (!slen)
				goto indeterminate;
			if (s[1] == ',') {
				c = UINT32_C(0x1F101) + (unsigned)(s[0] - '0');
				goto conv2;
			} else if (s[1] == '.') {
				if (s[0] == '0')
					c = UINT32_C(0x1F100);
				else
					c = UINT32_C(0x2488) + (unsigned)(s[0] - '1');
				goto conv2;
			} else if (s[0] == '1' && '0' <= s[1] && s[1] <= '9') {
				if (slen < 2u)
					goto indeterminate;
				if (s[2] == '.')
					c = UINT32_C(0x2491) + (unsigned)(s[1] - '0');
				else
					goto no_match;
				goto conv3;
			} else if (s[0] == '2' && s[1] == '0') {
				if (slen < 2u)
					goto indeterminate;
				if (s[2] == '.')
					c = UINT32_C(0x249B);
				else
					goto no_match;
				goto conv3;
			} else {
				goto no_match;
			}
		} else if (s[0] == '(') {
			if (!slen--)
				goto indeterminate;
			if (s[1] == '1') {
				if (!slen--)
					goto indeterminate;
				if (s[2] == ')') {
					c = UINT32_C(0x2474);
					goto conv3;
				} else if ('0' <= s[2] && s[2] <= '9') {
					if (!slen--)
						goto indeterminate;
					if (s[3] != ')')
						goto no_match;
					c = UINT32_C(0x247D) + (unsigned)(s[2] - '0');
					goto conv4;
				} else {
					goto no_match;
				}
			} else if (s[1] == '2') {
				if (!slen--)
					goto indeterminate;
				if (s[2] == ')') {
					c = UINT32_C(0x2475);
					goto conv3;
				} else if (s[2] == '0') {
					if (!slen--)
						goto indeterminate;
					if (s[3] != ')')
						goto no_match;
					c = UINT32_C(0x2487);
					goto conv4;
				} else {
					goto no_match;
				}
			} else if ('3' <= s[1] && s[1] <= '9') {
				if (!slen--)
					goto indeterminate;
				if (s[2] != ')')
					goto no_match;
				c = UINT32_C(0x2474) + (unsigned)(s[1] - '0');
				goto conv3;
			} else if ('a' <= s[1] && s[1] <= 'z') {
				if (!slen--)
					goto indeterminate;
				if (s[2] != ')')
					goto no_match;
				c = UINT32_C(0x249C) + (unsigned)(s[1] - 'a');
				goto conv3;
			} else if ('A' <= s[1] && s[1] <= 'Z') {
				if (!slen--)
					goto indeterminate;
				if (s[2] != ')')
					goto no_match;
				c = UINT32_C(0x1F110) + (unsigned)(s[1] - 'A');
				goto conv3;
			} else {
				goto no_match;
			}
		} else {
		no_match:
			*n += 1u;
			break;
		}
	}
no_conv:
	return LIBCHARCONV_NO_CONVERT;

indeterminate:
	if (*n)
		goto no_conv;
	return LIBCHARCONV_INDETERMINATE;

conv2:
	if (*n)
		goto no_conv;
	if (*ncp)
		*cp = c;
	*n += 2u;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;

conv3:
	if (*n)
		goto no_conv;
	if (*ncp)
		*cp = c;
	*n += 3u;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;

conv4:
	if (*n)
		goto no_conv;
	if (*ncp)
		*cp = c;
	*n += 4u;
	*ncp = 1u;
	return LIBCHARCONV_CONVERTED;
}