[antlr-interest] - Python Target

[Edward Hartley]

> I'm looking at the example grammar Expr.g from the book and when testing
> it with valid expressions like (3+4)*9 I get the output like the following
>>>> (3+4)*9
> line 0:-1 mismatched input '<EOF>' expecting NEWLINE
>
> Is this behaviour correct or is it due to my having missed something:
> I retained the skip() call in the  NEWLINE rule.
> I don not get this behavior with the Java target and see the same as is
> described in the book.

I can't reproduce this. Are you sure that the input actually has a '\n' at
the end? How does your main script look like?



My Driver program looks like this:

import antlr3
from ExprLexer import ExprLexer
from ExprParser import ExprParser



while True:
    expr = raw_input('>>> ')
    if expr == "'':
        break
    cStream = antlr3.StringStream(expr)
    lexer = ExprLexer(cStream)
    tStream = antlr3.CommonTokenStream(lexer)
    parser = ExprParser(tStream)
    parser.prog()

I'm a bit mystified and expect I've missed something blindingly obvious.
TIA
Ed
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