Re: PLY problem.

On Tue, 17 Jun 2003, H Jansen wrote:

> The correct regular expression for a C-style comment in PLY seems to be:

knowing nothing about PLY, but in re this means

either "/* any character but no newline */"
or "/*\n*/".

> # C-style comment
>
> def t_comment(t):
>     r'\/\*(.|\n)*?\*\/'
>     t.lineno += t.value.count('\n')
>
> Since no return value is passed, the lexer should ignore this. However,
> when parsing the multiline comment
>
>
> """
>
>  /* O
>     K  */
>
> """
>
>
> the lexer issues the following error:
>
> ...
> (<function t_newline at 0x4054317c>, 'newline')
>
>
> None /* O
>     K */
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "/usr/tmp/python-XYAtGu.py", line 148, in ?
>     yacc.parse(s, lexer=lexer, debug=1)
>   File "yacc.py", line 197, in parse
>     lookahead = get_token()     # Get the next token
>   File "lex.py", line 307, in realtoken
>     # If token is processed by a function, call it
> TypeError: unpack non-sequence
> >>>
>
>
> Anybody a guess what's wrong?

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