/*
 * Copyright (c) 2023 : Ognjen 'xolatile' Milan Robovic
 *
 * Xyntax is free software! You will redistribute it or modify it under the terms of the GNU General Public License by Free Software Foundation.
 * And when you do redistribute it or modify it, it will use either version 3 of the License, or (at yours truly opinion) any later version.
 * It is distributed in the hope that it will be useful or harmful, it really depends... But no warranty what so ever, seriously. See GNU/GPLv3.
 */

#ifndef XYNTAX_SOURCE
#define XYNTAX_SOURCE

#include <xolatile/xyntax.h>

int      syntax_count     = 0;
int    * syntax_enrange   = NULL;
int    * syntax_derange   = NULL;
char * * syntax_begin     = NULL;
char * * syntax_end       = NULL;
char   * syntax_escape    = NULL;
int    * syntax_colour    = NULL;
int    * syntax_effect    = NULL;
char   * syntax_separator = NULL;

int syntax_insert (int enrange, int derange, char * begin, char * end, char escape, int colour, int effect) {
	fatal_failure (begin == NULL, "syntax_define: Begin string is null pointer.");
	fatal_failure (end   == NULL, "syntax_define: End string is null pointer.");

	++syntax_count;

	syntax_enrange = reallocate (syntax_enrange, syntax_count * (int) sizeof (* syntax_enrange));
	syntax_derange = reallocate (syntax_derange, syntax_count * (int) sizeof (* syntax_derange));
	syntax_begin   = reallocate (syntax_begin,   syntax_count * (int) sizeof (* syntax_begin));
	syntax_end     = reallocate (syntax_end,     syntax_count * (int) sizeof (* syntax_end));
	syntax_escape  = reallocate (syntax_escape,  syntax_count * (int) sizeof (* syntax_escape));
	syntax_colour  = reallocate (syntax_colour,  syntax_count * (int) sizeof (* syntax_colour));
	syntax_effect  = reallocate (syntax_effect,  syntax_count * (int) sizeof (* syntax_effect));

	syntax_begin [syntax_count - 1] = allocate ((string_length (begin) + 1) * (int) sizeof (* * syntax_begin));
	syntax_end   [syntax_count - 1] = allocate ((string_length (end)   + 1) * (int) sizeof (* * syntax_end));

	syntax_enrange [syntax_count - 1] = enrange;
	syntax_derange [syntax_count - 1] = derange;
	syntax_escape  [syntax_count - 1] = escape;
	syntax_colour  [syntax_count - 1] = colour;
	syntax_effect  [syntax_count - 1] = effect;

	string_copy (syntax_begin [syntax_count - 1], begin);
	string_copy (syntax_end   [syntax_count - 1], end);

	return (syntax_count - 1);
}

int syntax_select (char * string, int * length) {
	int offset = 0;
	int select = 0;

	fatal_failure (string == NULL, "syntax_select: String is null.");
	fatal_failure (length == NULL, "syntax_select: Length is null.");

	do {
		if (syntax_enrange [select] == 0) {
			if (string_compare_limit (string, syntax_begin [select], string_length (syntax_begin [select])) != 0) {
				if (syntax_derange [select] == 0) {
					break;
				} else {
					if (character_compare_array (string [string_length (syntax_begin [select])], syntax_end [select], string_length (syntax_end [select])) != 0) {
						break;
					}
				}
			}
		} else {
			int subset = 0;
			do {
				if (string [offset] == syntax_begin [select] [subset]) {
					goto selected;
				}
			} while (++subset != (int) string_length (syntax_begin [select]));
		}
	} while (++select != syntax_count);

	selected:

	if (select == syntax_count) {
		* length = 1;

		return (select);
	}

	do {
		++offset;

		if (string [offset] == syntax_escape [select]) {
			++offset;
			continue;
		}

		if (syntax_derange [select] == 0) {
			if (string_compare_limit (& string [offset], syntax_end [select], string_length (syntax_end [select]))) {
				* length = offset + string_length (syntax_end [select]);
				return (select);
			}
		} else {
			int subset = 0;
			if (string_compare (syntax_end [select], "") == 0) {
				break;
			} do {
				if (string [offset] == syntax_end [select] [subset]) {
					* length = offset;
					return (select);
				}
			} while (++subset != (int) string_length (syntax_end [select]));
		}
	} while (string [offset - 1] != '\0');

	return (select);
}

void syntax_delete (void) {
	if (syntax_count == 0) {
		return;
	}

	--syntax_count;

	do {
		syntax_begin [syntax_count] = deallocate (syntax_begin [syntax_count]);
		syntax_end   [syntax_count] = deallocate (syntax_end   [syntax_count]);
	} while (--syntax_count != -1);

	syntax_enrange = deallocate (syntax_enrange);
	syntax_derange = deallocate (syntax_derange);
	syntax_begin   = deallocate (syntax_begin);
	syntax_end     = deallocate (syntax_end);
	syntax_escape  = deallocate (syntax_escape);
	syntax_colour  = deallocate (syntax_colour);
	syntax_effect  = deallocate (syntax_effect);

	syntax_count = 0;
}

/* Simplification... */

void syntax_define_separators (char * separator) {
	syntax_separator = separator;
}

void syntax_define_default (int string_colour, int string_effect, int number_colour, int number_effect) {
	(void) syntax_insert (1, 0, " \t\r\n",    "",               '\0', COLOUR_WHITE,  EFFECT_BOLD);
	(void) syntax_insert (0, 0, "\"",         "\"",             '\\', string_colour, string_effect);
	(void) syntax_insert (1, 1, "0123456789", syntax_separator, '\0', number_colour, number_effect);
}

void syntax_define_words (char * * word_array, int word_count, int word_colour, int word_effect) {
	int word = 0;

	for (word = 0; word != word_count; ++word) {
		(void) syntax_insert (0, 1, word_array [word], syntax_separator, '\0', word_colour, word_effect);
	}

	(void) syntax_insert (1, 1, "abcdefghijklmnopqrstuvwxyz", syntax_separator, '\0', COLOUR_WHITE, EFFECT_NORMAL);
	(void) syntax_insert (1, 1, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", syntax_separator, '\0', COLOUR_WHITE, EFFECT_BOLD);
	(void) syntax_insert (1, 1, "_",                          syntax_separator, '\0', COLOUR_PINK,  EFFECT_BOLD);
}

void syntax_define_range (char * range_begin, char * range_end, char range_escape, int range_colour, int range_effect) {
	(void) syntax_insert (0, 0, range_begin, range_end, range_escape, range_colour, range_effect);
}

void syntax_define_operators (char * operator_array, int operator_colour, int operator_effect) {
	(void) syntax_insert (1, 0, operator_array, "", '\0', operator_colour, operator_effect);
}

#endif