#pragma once
#include "slice.h"
#include "group.h"

enum {
	TOK_NONE       = 0,
	TOK_GROUP      = '@',
	TOK_OPEN_CURL  = '{',
	TOK_CLOS_CURL  = '}',
	TOK_OPEN_PAREN = '(',
	TOK_CLOS_PAREN = ')',
	TOK_OPEN_SQUAR = '[',
	TOK_CLOS_SQUAR = ']',
	TOK_ASSIGN     = '=',
	TOK_END        = ';',
	TOK_NUMBER     = '0',
	TOK_CHAR       = 'c',
	TOK_STRING     = 's',
	TOK_WORD       = 'w',
	TOK_KW_LET     = 'L',
	TOK_KW_IF      = 'I',
	TOK_KW_ELSE    = 'E',
	TOK_KW_WHILE   = 'W',
	TOK_KW_RETURN  = 'R',
};

typedef struct Token Token;
struct Token {
	unsigned char type;
	union {
		Slice slice;
		Group group;
	};
	Token *prev;
	Token *next;
};

Token *token_create(Slice slice, unsigned int type);
void token_destroy(Token *token);
Token *token_append(Token **list, Token *elem);
Token *token_prepend(Token **list, Token *elem);
void token_delete(Token **list, Token *elem);
Token *token_extract(Token **list, Token *elem);
Token *token_search(Token *list, unsigned int type);
Token *token_search_closing(Token *list, unsigned int type, unsigned int opn);
Token *token_print(Token *token, int recurse, int depth);
int token_isgroup(Token *token, unsigned int type);
int token_len(Token *token);
Token *token_last(Token *token);