#ifndef UNDAR_LEXER_H
#define UNDAR_LEXER_H

typedef enum {
  TOKEN_EOF,
  TOKEN_IDENTIFIER,
  TOKEN_INT_LITERAL,
  TOKEN_UINT_LITERAL,
  TOKEN_FLOAT_LITERAL,
  TOKEN_STRING_LITERAL,
  TOKEN_TYPE_INT,
  TOKEN_TYPE_NAT,
  TOKEN_TYPE_REAL,
  TOKEN_TYPE_STR,
  TOKEN_KEYWORD_PLEX,
  TOKEN_KEYWORD_FN,
  TOKEN_KEYWORD_CONST,
  TOKEN_KEYWORD_IF,
  TOKEN_KEYWORD_ELSE,
  TOKEN_KEYWORD_WHILE,
  TOKEN_KEYWORD_FOR,
  TOKEN_KEYWORD_RETURN,
  TOKEN_KEYWORD_USE,
  TOKEN_KEYWORD_INIT,
  TOKEN_KEYWORD_THIS,
  TOKEN_KEYWORD_OPEN,
  TOKEN_KEYWORD_READ,
  TOKEN_KEYWORD_WRITE,
  TOKEN_KEYWORD_REFRESH,
  TOKEN_KEYWORD_CLOSE,  
  TOKEN_KEYWORD_NIL,
  TOKEN_KEYWORD_TRUE,
  TOKEN_KEYWORD_FALSE,
  TOKEN_OPERATOR_IS,
  TOKEN_OPERATOR_NOT,
  TOKEN_OPERATOR_AND,
  TOKEN_OPERATOR_OR,
  TOKEN_BANG,
  TOKEN_BANG_EQ,
  TOKEN_EQ,
  TOKEN_EQ_EQ,
  TOKEN_GT,
  TOKEN_LT,
  TOKEN_GTE,
  TOKEN_LTE,
  TOKEN_DOT,
  TOKEN_COMMA,
  TOKEN_COLON,
  TOKEN_SEMICOLON,
  TOKEN_PLUS,
  TOKEN_MINUS,
  TOKEN_STAR,
  TOKEN_SLASH,
  TOKEN_LPAREN,
  TOKEN_RPAREN,
  TOKEN_LBRACE,
  TOKEN_RBRACE,
  TOKEN_LBRACKET,
  TOKEN_RBRACKET,
  TOKEN_ERROR
} TokenType;

typedef struct {
  TokenType type;
  const char *start;
  int length;
  int line;
} Token;

void initLexer(const char *source);
Token nextToken();
const char* tokenTypeToString(TokenType type);

#endif