#ifndef clox_scanner_h
#define clox_scanner_h

typedef enum {
  // Single-character tokens.
  TOKEN_LEFT_PAREN, TOKEN_RIGHT_PAREN, TOKEN_LEFT_BRACE, TOKEN_RIGHT_BRACE,
  TOKEN_LEFT_BRACKET, TOKEN_RIGHT_BRACKET, TOKEN_COMMA, TOKEN_DOT, TOKEN_MINUS,
  TOKEN_PLUS, TOKEN_SEMICOLON, TOKEN_SLASH, TOKEN_STAR,

  // One or two character tokens.
  TOKEN_BANG, TOKEN_BANG_EQUAL, TOKEN_EQUAL, TOKEN_EQUAL_EQUAL, TOKEN_GREATER,
  TOKEN_GREATER_EQUAL, TOKEN_LESS, TOKEN_LESS_EQUAL, TOKEN_ROCKET,

  // Literals.
  TOKEN_IDENTIFIER, TOKEN_STRING, TOKEN_NUMBER,

  // Keywords.
  TOKEN_AND, TOKEN_CLASS, TOKEN_ELSE, TOKEN_FALSE, TOKEN_FOR, TOKEN_FUN,
  TOKEN_IF, TOKEN_NIL, TOKEN_OR, TOKEN_PRINT, TOKEN_RETURN, TOKEN_SUPER,
  TOKEN_THIS, TOKEN_TRUE, TOKEN_VAR, TOKEN_WHILE,

  TOKEN_ERROR, TOKEN_EOF
} TokenType;

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

void initScanner(const char* source);
Token scanToken();
bool scannerHasSemicolons();

#endif