Hello,

I have a complex grammar (in antlr 2.7) which I need to extend. Having never used antlr before, I wanted to write a very simple Lexer and Parser first.

I found a very good explanation for antlr3 and tried to adapt it:

header{
    #include <iostream>
    using namespace std;
}

options { 
    language="Cpp"; 
}

class P2 extends Parser;

/* This will be the entry point of our parser. */
eval
    :    additionExp
    ;

/* Addition and subtraction have the lowest precedence. */
additionExp
    :    multiplyExp 
         ( "+" multiplyExp 
         | "-" multiplyExp
         )* 
    ;

/* Multiplication and addition have a higher precedence. */
multiplyExp
    :    atomExp
         ( "*" atomExp 
         | "/" atomExp
         )* 
    ;

/* An expression atom is the smallest part of an expression: a number. Or 
   when we encounter parenthesis, we're making a recursive call back to the
   rule 'additionExp'. As you can see, an 'atomExp' has the highest precedence. */
atomExp
    :    Number
    |    "(" additionExp ")"
    ;

/* A number: can be an integer value, or a decimal value */
number
    :    ("0".."9")+ ("." ("0".."9")+)?
    ;

/* We're going to ignore all white space characters */
protected
ws  
    :   (" " | "\t" | "\r" | "\n") { newline(); }
    ;

It does generate four files without errors: P2.cpp, P2.hpp, P2TokenTypes.hpp and P2TokenTypes.txt. But now what? How do I create a working programm with that? I tried to add these files to a VS2005-WinConsole-Project but it does not compile:

p2.cpp(277) : fatal error C1010: unexpected end of file while looking for precompiled header. Did you forget to add '#include "stdafx.h"' to your source?