Enquanto.g4

Regras

1. programa
2. seqComando
3. comando
4. expressao
5. bool
6. INT
7. ID
8. Texto
9. Espaco

programa

Text notation:

programa : seqComando ;

Visual notation:

seqComando

Text notation:

seqComando : comando (';' comando)* ;

Visual notation:

comando

Text notation:

comando :
    ID ':=' expressao                         # atribuicao
  | 'skip'                                    # skip
  | 'se' bool 'entao' comando 'senao' comando # se
  | 'enquanto' bool 'faca' comando            # enquanto
  | 'exiba' Texto                             # exiba
  | 'escreva' expressao                       # escreva
  | '{' seqComando '}'                        # bloco ;

Visual notation:

expressao

Text notation:

expressao : 
    INT                      # inteiro
  | 'leia'                   # leia 
  | ID                       # id 
  | expressao '*' expressao  # opBin 
  | expressao '+' expressao  # opBin 
  | expressao '-' expressao  # opBin 
  | '(' expressao ')'        # expPar ;

Visual notation:

bool

Text notation:

bool :
     ('verdadeiro'|'falso')     # booleano 
   | expressao '=' expressao    # opRel 
   | expressao '<=' expressao   # opRel 
   | 'nao' bool                 # naoLogico 
   | bool 'e' bool              # eLogico 
   | bool 'ou' bool             # ouLogico
   | '(' bool ')'               # boolPar ;

Visual notation:

INT

Text notation:

INT : ('0'..'9')+ ;

Visual notation:

ID

Text notation:

ID : ('a'..'z')+ ;

Visual notation:

Texto

Text notation:

Texto : '"' .*? '"' ;

Visual notation:

Espaco

Text notation:

Espaco : [ \t\n\r] -> Skip ;

Visual notation:

Generated by: ANTLR 4 IDE. Copyright (c) 2013 Edgar Espina