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

/*  treebnf: a tree oriented bnf library                      */

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

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

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

#include <treebnf/treebnf.h>

#include "treebnf_regex_impl.h"

#include "treebnf_visibility_impl.h"

#include "tbnf_regex_defs.h"

#include "tbnf_regex_scanfns.h"

#define TBNF_STATE_STACK_SIZE   (512)

/* init state scan table*/

static struct tbnf_scan_tbl tbnf_regex_scan_tbl__init[TBNF_REGEX_TOK_CAP] = {

	/* --> brace */

	[TBNF_REGEX_TOK_LBRACE] = {

		.tok_scan_fn    = tbnf_regex_scan_lbrace,

		.tok_state_op   = TBNF_STATE_PUSH,

		.tok_state_next = TBNF_REGEX_STATE_BRACE,

	},

	/* --> bracket */

	[TBNF_REGEX_TOK_LBRACKET_CIRCUMFLEX_RBRACKET] = {

		.tok_scan_fn    = tbnf_regex_scan_lbracket_circumflex_rbracket,

		.tok_state_op   = TBNF_STATE_PUSH,

		.tok_state_next = TBNF_REGEX_STATE_BRACKET,

	},

	[TBNF_REGEX_TOK_LBRACKET_CIRCUMFLEX] = {

		.tok_scan_fn    = tbnf_regex_scan_lbracket_circumflex,

		.tok_state_op   = TBNF_STATE_PUSH,

		.tok_state_next = TBNF_REGEX_STATE_BRACKET,

	},

	[TBNF_REGEX_TOK_LBRACKET_RBRACKET] = {

		.tok_scan_fn    = tbnf_regex_scan_lbracket_rbracket,

		.tok_state_op   = TBNF_STATE_PUSH,

		.tok_state_next = TBNF_REGEX_STATE_BRACKET,

	},

	[TBNF_REGEX_TOK_LBRACKET] = {

		.tok_scan_fn    = tbnf_regex_scan_lbracket,

		.tok_state_op   = TBNF_STATE_PUSH,

		.tok_state_next = TBNF_REGEX_STATE_BRACKET,

	},

	/* (expression) */

	[TBNF_REGEX_TOK_ESCAPED_CHAR] = {

		.tok_scan_fn    = tbnf_regex_scan_escaped_char,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_CIRCUMFLEX_ASTERISK] = {

		.tok_scan_fn    = tbnf_regex_scan_circumflex_asterisk,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_CIRCUMFLEX] = {

		.tok_scan_fn    = tbnf_regex_scan_circumflex,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_LPAREN] = {

		.tok_scan_fn    = tbnf_regex_scan_lparen,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_RPAREN] = {

		.tok_scan_fn    = tbnf_regex_scan_rparen,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_ASTERISK] = {

		.tok_scan_fn    = tbnf_regex_scan_asterisk,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_PERIOD] = {

		.tok_scan_fn    = tbnf_regex_scan_period,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_DOLLAR] = {

		.tok_scan_fn    = tbnf_regex_scan_dollar,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_VLINE] = {

		.tok_scan_fn    = tbnf_regex_scan_vline,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_QMARK] = {

		.tok_scan_fn    = tbnf_regex_scan_qmark,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_PLUS] = {

		.tok_scan_fn    = tbnf_regex_scan_plus,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_CHAR] = {

		.tok_scan_fn    = tbnf_regex_scan_char,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

};

/* brace state scan table*/

static struct tbnf_scan_tbl tbnf_regex_scan_tbl__brace[TBNF_REGEX_TOK_CAP] = {

	[TBNF_REGEX_TOK_BRACE_RBRACE] = {

		.tok_scan_fn    = tbnf_regex_scan_brace_rbrace,

		.tok_state_op   = TBNF_STATE_POP,

	},

	[TBNF_REGEX_TOK_BRACE_DIGIT] = {

		.tok_scan_fn    = tbnf_regex_scan_brace_digit,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACE_COMMA] = {

		.tok_scan_fn    = tbnf_regex_scan_brace_comma,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

};

/* bracket state scan table*/

static struct tbnf_scan_tbl tbnf_regex_scan_tbl__bracket[TBNF_REGEX_TOK_CAP] = {

	[TBNF_REGEX_TOK_BRACKET_RBRACKET] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_rbracket,

		.tok_state_op   = TBNF_STATE_POP,

	},

	[TBNF_REGEX_TOK_BRACKET_ESCAPED_CHAR] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_escaped_char,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACKET_CHARACTER_CLASS] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_character_class,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACKET_COLLATION_SYMBOL] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_collation_symbol,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACKET_EQUIVALENCE_CLASS] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_equivalence_class,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACKET_HYPHEN] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_hyphen,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACKET_ERROR] = {

		.tok_scan_fn    = tbnf_regex_scan_bracket_error,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

	[TBNF_REGEX_TOK_BRACKET_CHAR] = {

		.tok_scan_fn    = tbnf_regex_scan_char,

		.tok_state_op   = TBNF_STATE_KEEP,

	},

};

/* extended regex expression token scan table */

tbnf_hidden struct tbnf_scan_tbl * tbnf_regex_scan_tbl[] = {

	[TBNF_REGEX_STATE_INIT]    = tbnf_regex_scan_tbl__init,

	[TBNF_REGEX_STATE_BRACE]   = tbnf_regex_scan_tbl__brace,

	[TBNF_REGEX_STATE_BRACKET] = tbnf_regex_scan_tbl__bracket,

	[TBNF_REGEX_STATE_CAP]     = 0,

};