/**************************************************************/

/*  treebnf: a tree oriented bnf library                      */

/*  Copyright (C) 2024  SysDeer Technologies, LLC             */

/*  Released under GPLv2 and GPLv3; see COPYING.TREEBNF.      */

/**************************************************************/

#ifndef TBNF_REGEX_SCANFNS_H

#define TBNF_REGEX_SCANFNS_H

#include <treebnf/treebnf.h>

/* in-brace scanners */

static inline int tbnf_regex_scan_brace_rbrace(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '}')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_brace_digit(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] >= '0')

		if (sctx->tok_scan_mark[0] <= '9')

			return 1;

	return 0;

}

static inline int tbnf_regex_scan_brace_comma(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == ',')

		return 1;

	return 0;

}

/* in-bracket scanners */

static inline int tbnf_regex_scan_bracket_escaped_char(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '\\')

		if (&sctx->tok_scan_mark[1] < sctx->tok_scan_cap)

			if (sctx->tok_scan_mark[1])

				return 2;

	return 0;

}

static inline int tbnf_regex_scan_bracket_character_class(const struct tbnf_scan_ctx * sctx)

{

	const char * ch = 0;

	if (&sctx->tok_scan_mark[4] >= sctx->tok_scan_cap)

		return 0;

	if (sctx->tok_scan_mark[0] == '[')

		if (sctx->tok_scan_mark[1] == ':')

			ch = &sctx->tok_scan_mark[2];

	if (!ch)

		return 0;

	for (; (*ch >= 'a') && (*ch <= 'z') && (&ch[2] < sctx->tok_scan_cap); )

		ch++;

	if ((*ch++ == ':') && (*ch++ == ']'))

			return (ch - sctx->tok_scan_mark);

	return 0;

}

static inline int tbnf_regex_scan_bracket_collation_symbol(const struct tbnf_scan_ctx * sctx)

{

	if (&sctx->tok_scan_mark[4] >= sctx->tok_scan_cap)

		return 0;

	if (sctx->tok_scan_mark[0] == '[')

		if (sctx->tok_scan_mark[1] == '.')

			if (sctx->tok_scan_mark[3] == '.')

				if (sctx->tok_scan_mark[4] == ']')

					if (sctx->tok_scan_mark[2])

						return 5;

	return 0;

}

static inline int tbnf_regex_scan_bracket_equivalence_class(const struct tbnf_scan_ctx * sctx)

{

	const char * ch = 0;

	if (&sctx->tok_scan_mark[4] >= sctx->tok_scan_cap)

		return 0;

	if (sctx->tok_scan_mark[0] == '[')

		if (sctx->tok_scan_mark[1] == '=')

			ch = &sctx->tok_scan_mark[2];

	if (!ch)

		return 0;

	for (; (*ch >= 'a') && (*ch <= 'z') && (&ch[2] < sctx->tok_scan_cap); )

		ch++;

	if ((*ch++ == '=') && (*ch++ == ']'))

			return (ch - sctx->tok_scan_mark);

	return 0;

}

static inline int tbnf_regex_scan_bracket_rbracket(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == ']')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_bracket_hyphen(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '-')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_bracket_error(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '[')

		return 1;

	return 0;

}

/* bracket state entry scanners */

static inline int tbnf_regex_scan_lbracket_circumflex_rbracket(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '[')

		if (&sctx->tok_scan_mark[2] < sctx->tok_scan_cap)

			if (sctx->tok_scan_mark[1] == '^')

				if (sctx->tok_scan_mark[2] == ']')

					return 3;

	return 0;

}

static inline int tbnf_regex_scan_lbracket_circumflex(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '[')

		if (&sctx->tok_scan_mark[1] < sctx->tok_scan_cap)

			if (sctx->tok_scan_mark[1] == '^')

				return 2;

	return 0;

}

static inline int tbnf_regex_scan_lbracket_rbracket(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '[')

		if (&sctx->tok_scan_mark[1] < sctx->tok_scan_cap)

			if (sctx->tok_scan_mark[1] == ']')

				return 2;

	return 0;

}

static inline int tbnf_regex_scan_lbracket(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '[')

		return 1;

	return 0;

}

/* common scanners */

static inline int tbnf_regex_scan_escaped_char(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '\\')

		if (&sctx->tok_scan_mark[1] < sctx->tok_scan_cap)

			if (sctx->tok_scan_mark[1])

				return 2;

	return 0;

}

static inline int tbnf_regex_scan_circumflex_asterisk(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '^')

		if (&sctx->tok_scan_mark[1] < sctx->tok_scan_cap)

			if (sctx->tok_scan_mark[1] == '*')

				return 2;

	return 0;

}

static inline int tbnf_regex_scan_circumflex(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '^')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_lbrace(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '{')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_lparen(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '(')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_rparen(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == ')')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_asterisk(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '*')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_period(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '.')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_dollar(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '$')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_vline(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '|')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_qmark(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '?')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_plus(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0] == '+')

		return 1;

	return 0;

}

static inline int tbnf_regex_scan_char(const struct tbnf_scan_ctx * sctx)

{

	if (sctx->tok_scan_mark[0])

		return 1;

	return 0;

}

#endif