scanner.h

//
//  scanner.h
//  Oberon
//
//  Created by Alvaro Costa Neto on 10/12/13.
//  Copyright (c) 2013 Alvaro Costa Neto. All rights reserved.
//

#ifndef Oberon_scanner_h
#define Oberon_scanner_h

#include <stdio.h>
#include <stdbool.h>

#define SCANNER_MAX_ID_LENGTH 16

typedef enum _symbol {
  symbol_null = 0,

  //aritméticos
  symbol_times = 1,
  symbol_division = 2, //divisão
  symbol_div = 3, //divisão de número inteiro
  //symbol_mod = 4,
  symbol_plus = 6,
  symbol_minus = 7,
  symbol_power = 76,

  //lógicos
  symbol_and = 5,
  symbol_or = 8,
  symbol_not = 32,
  symbol_xor = 65,

  //comparação
  symbol_equal = 9,
  symbol_not_equal = 10,
  symbol_less = 11,
  symbol_less_equal = 12,
  symbol_greater = 13,
  symbol_greater_equal = 14,

  //pontuação
  symbol_period = 18,
  symbol_comma = 19,
  symbol_colon = 20,
  symbol_close_paren = 22,
  symbol_close_bracket = 23,
  symbol_close_braces = 24,
  symbol_quotes = 28,
  symbol_open_paren = 29,
  symbol_open_bracket = 30,
  symbol_open_braces = 31,
  symbol_becomes = 33, //atribuição
  symbol_semicolon = 38,
  symbol_range = 77, //".."

  //elemento léxico
  symbol_integer = 34,
  symbol_real = 35,
  symbol_id = 37,

  //palavras-chave
  symbol_of = 25, //de
  symbol_then = 26, //então
  symbol_do = 27, // faça
  symbol_end = 40, //fim
  symbol_end_if = 66, //fim_se
  symbol_end_case = 67, //fim_caso
  symbol_end_while = 68, //fim_enquanto
  symbol_end_for = 69, //fim_para
  symbol_end_until_true = 70, //fim_até_seja
  symbol_else = 41, //senão
  //symbol_elsif = 42,
  symbol_until = 43, //até_que
  symbol_if = 44, //se
  symbol_case = 45, //caso
  symbol_while = 46, //enquanto
  symbol_repeat = 47, //repita
  symbol_for = 48, //para
  symbol_until_true = 49, //até_seja
  symbol_is = 50, //seja
  symbol_perform = 51, //efetue
  symbol_execute = 52, //execute
  symbol_while_is = 53, //enquanto_for
  symbol_loop = 71, //laço
  symbol_leave_if = 72, //saia_caso
  symbol_from = 73, //de
  symbol_up_to = 74, //até
  symbol_step = 75, //passo
  symbol_array = 54,
  symbol_record = 55,
  symbol_const = 57,
  symbol_type = 58,
  symbol_var = 59,
  //symbol_proc = 60,
  symbol_func = 60,
  symbol_read = 78, //leia
  symbol_write = 79, //escreva
  symbol_begin = 61, //inicio
  //symbol_module = 63,
  symbol_program = 63,
  symbol_eof = 64,
  symbol_newline = 80
} symbol_t;

#include "backend.h"

// TODO: Organizar esta bagunça. Simplificar!

typedef char identifier_t[SCANNER_MAX_ID_LENGTH + 1];

typedef struct _position {
  unsigned int line;
  unsigned int column;
  fpos_t index;
} position_t;

typedef struct _lexem {
  identifier_t id;
  symbol_t symbol;
} lexem_t;

typedef struct _token {
  lexem_t lexem;
  value_t value;
  position_t position;
} token_t;

extern token_t current_token, last_token;

extern const position_t position_zero;

char *id_for_symbol(symbol_t symbol);

symbol_t inverse_condition(symbol_t symbol);

void initialize_scanner(FILE *file);
void read_token();

#endif