From: jono (jp_at_[hidden])
Date: 2008-01-22 20:04:25
hello possums!
i have the following rules declared in a spirit grammar definition
(using boost 1.8.4 ).....
//-----------------------
typedef typename lexeme_scanner<ScannerT>::type lexeme_scanner_t;
rule<lexeme_scanner_t>
legal_initial_p
,legal_p
;
//-----------------------
and initialized in definition::definition() ....
//-----------------------
legal_initial_p = alpha_p | ch_p('_')
|'<'|'>'|'='|'?'|'/'|'*'|'&'|'-'|'+'|'%'
|'!'|'$'|':'|'@'
;
legal_p = legal_initial_p | digit_p | ch_p('.')
;
//-----------------------
the above code compiles and functions as expected under MSVC 7.1 but
causes g++ 4.1.1 to hang.
if i use type rule<ScannerT> for legal_p and legal_initial_p, the code
compiles on both, but doesn't work properly.
i'm using |dynamic_distinct_parser ||so i can handle the '.' character
as a syntactic token in certain contexts.
|||//---------------------- |some declarations ...
||
struct keywords : symbols<Object> { ... } keywords_p;
|| ||dynamic_distinct_parser<ScannerT> keyword_p;
|||||
//----------------------|some definitions ...|
|
||chset<> distinct(chset<>(legal_ident) | chset<>("0-9"));
distinct_directive<> keyword_d(distinct);
distinct_parser<> keyword_p(distinct);
||||
|| ||rule<ScannerT, object_closure::context_t> ||Symbol_p =
lexeme_d [ ( legal_initial_p >> *legal_p ) -
keywords_p ]
[ Symbol_p.value_ = intern_(arg1, arg2) ]
;
||
||| dot_p = keyword_p(".");
//----------------------
|// ....
||it's quite possible there's a better way to do the parsing, but it was
fiddly, and i don't have any more time to mess with it.
(the rest of the grammar is a recursive scheme reader, hence the closures)
i would be very grateful for any suggestions as to what might be causing
g++ to go walkabout!
cheers,
jono
jp_at_[hidden]
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