Re: [sqlite] using lemon
> Can anyone suggest a lexical scanner generator that: > a) Works well with Lemon? > b) Is also thread-safe (like Lemon)? > > Does Flex work well with Lemon? (I think it is not thread-safe, but it is > very popular and has plenty of examples around, which is also a plus for me) > > I am trying to learn a little about writing tokenizers/parsers, and thought > a */Lemon combo would be better to learn if I don't have any previous > experience anyway than Flex/Bison. I've used re2c recently. It should meet your needs, and worked well in my case. There is a lack of documentation, but I've pot most issues I've ran into on my blog : http://www.palsenberg.com/development/working-with-re2c-lessons-learned If you live up to those rules, live should be pleasant :) Igmar ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Lemon and errors
Hi,
I'm attempting to rewrite a buggy hand-written parser with a re2c / lemon one.
I've ran into a strange thing (which is/was actually a bug in the lexer), but I
can't determine why lemon finishes parsing, instead of throwing up a parser
error.
The stripped-down parser :
[igmar@devel native]$ lemon -g parser.le
// Reprint of input file "parser.le".
// Symbols:
// 0 $ 4 CURLY_OPEN 8 start 12 identparam
// 1 DOUBLE_QUOTE 5 CURLY_CLOSE9 groups
// 2 STRING 6 SEMICOLON 10 group
// 3 IDENTIFIER 7 error 11 identparams
start ::= groups.
groups ::= groups group.
groups ::= group.
identparams ::= identparams identparam.
identparams ::= identparam.
identparam ::= DOUBLE_QUOTE STRING|IDENTIFIER DOUBLE_QUOTE.
identparam ::= STRING|IDENTIFIER.
group ::= IDENTIFIER identparams CURLY_OPEN CURLY_CLOSE SEMICOLON.
group ::= IDENTIFIER CURLY_OPEN CURLY_CLOSE SEMICOLON.
Should be fairly simple.
Input :
service transparent nntp {
};
acl telnet-service-acl {
};
I've put the tracelog on pastebin : http://pastebin.com/9FiUmd6a , can anyone
en lighten me why the parser doesn't throw parser errors as I expect ?
Regards,
Igmar
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Re: [sqlite] SQLite on Windows 2003
> Yeah, I think it is related to that. I am not new to ASP.NET nor to > Windows 2003. I am new to SQLite, however. > But I think you are on to something. I even changed the file name > extension to .txt and it still doesn't work, > although it does work in the console application. > To test : create a user with admin rights, and let IIS run under that user. See if that helps. If it does, you've got a permission problem. If it doesn'r, it's more complicated that a simple permission issue. Igmar ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] SQLite on Windows 2003
> First of all, I want to thank everyone that has replied to this email > thread. > > I still do not have a successful opening of the SQLite connection in my > ASP.NET C# application on > Windows 2003. I have done the following: > > The connection opens successfully with the SQLite command tool. > It opens successfully using a C# console application. > I have entered the following in my web.config: > > I have installed SQLite on the server. > I have entered the following in my web.config and machine.config: > > > > description=".Net Framework Data Provider for > SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" /> > > > I have re-cycled IIS many times. > I have done everything suggested in the following link: > http://sqlite.phxsoftware.com/forums/p/1391/6025.aspx > Just a wild guess : You're sure you're not getting bitten by the fact that IIS under more recent Windows version is (extremely) restricted in the sense in what it can do on the filesytem ? Igmar ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Computing day of week the using strftime() function - Feature or bug ?
On 3/23/10 8:58 PM, Bernie Reiter wrote:
> Nico, thanks for your quick reply.
>
> I have copied the function strftime('%Y-%m-%d', ...) directly the sqlite
> documentation
> and substituted the ... with my date string.
> Unfortunately, your advice doesn't seem to convince my Linux box,
> neither with a straight single quote nor with a "backwards leaning" single
> quote
>
> [liveu...@localhost ~]$ SELECT strftime('%w','2010-03-21');
> bash: syntax error near unexpected token `('
>
>
> [liveu...@localhost ~]$ SELECT strftime('%w',`2010-03-21`);
> bash: syntax error near unexpected token `('
>
You're talking to bash, not sqlite.
Igmar
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[sqlite] [Lemon] Jump to %syntax_error
Hi, Can I somehow simulate a syntax error from within a rule action ? This parser looks up the token it receives, and I want to abort futher parsing in case that the lookup fails. as if there was a syntax error in the grammar. Regards, Igmr ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Questions regarding Lemon
> %type course_plot { std::vector* }
>
> course_plot(V) ::= COURSE_PLOT_BEG course_plot_sector(A) .
> {
>
The issue is more what V is when the vector isn't created.
Igmar
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[sqlite] Questions regarding Lemon
Hi,
After a decode or so I've begun to program in C again. I've writing a
parser, and Lemon seems like the right tool for the job. SQLite itself
is an excellent read when starting with lemon.
However, a few questions remain unanswered :
- How do variables get initialized ? For example :
%type assigments { struct llist *}
assignments(A) ::= assignments assignment(B). { /* . */ }
assignments(A) ::= assignment(B). {/* */ }
Can I assume that A, when the rule is executed the first time, is NULL ?
- What is the meaning of @ in an assignment ? From the sqlite parse.y
source :
transtype(A) ::= DEFERRED(X). {A = @X;}
Thanx in advance for all the hints :)
Regards,
Igmar
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