scanner.h

#ifndef clox_scanner_h
#define clox_scanner_h

/*
    This module implements the Scanner, also known as Lexer
*/

typedef enum {
    // Single-charchter tokens
    TOKEN_LEFT_PAREN, TOKEN_RIGHT_PAREN,
    TOKEN_LEFT_BRACE, TOKEN_RIGHT_BRACE,
    TOKEN_COMMA, TOKEN_DOT, TOKEN_MINUS, TOKEN_PLUS,
    TOKEN_SEMICOLON, TOKEN_SLASH, TOKEN_STAR,
    TOKEN_BACKSLASH, TOKEN_PERCENT,

    // 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,
  
    // Literals
    TOKEN_IDENTIFIER, TOKEN_STRING, TOKEN_NUMBER,
  
    // Keywords (16 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();

#endif