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Re: [BUGFIX] lexer waits for space to terminate the varname


From: Vladimir 'phcoder' Serbinenko
Subject: Re: [BUGFIX] lexer waits for space to terminate the varname
Date: Sun, 3 May 2009 11:12:14 +0200

Hello

On Sat, May 2, 2009 at 4:08 PM, Bean <address@hidden> wrote:
Hi,

I think there is problem with this patch. Consider ${aa}, the closing
character "}" would be left out.

Although you can remedy this by swapping:

 { GRUB_PARSER_STATE_VARNAME, GRUB_PARSER_STATE_TEXT, ' ', 1},
 { GRUB_PARSER_STATE_VARNAME2, GRUB_PARSER_STATE_TEXT, '}', 0},
It's not the same starting state. However similar issue exists with ' ' and '\"'

so that '}' would be handled before ' ', but it's still not a good
practice, as you have added a logic in code that would depend on the
order of state_transitions, which is not apparent for casual code
viewer.
Perhaps we should switch to just ordering the transition rules instead of separate code for default value
Also, ' ' might be used for other transition in the future,
this code could break that. I suggest you use {} to enclose the
variable that doesn't terminated with space,
It can be a workaround  but the bug is still here. The following pieces of code fail:
1) echo $hello;
2) echo $hello

or add the terminating
character explicitly in the transition table:


 { GRUB_PARSER_STATE_VARNAME, GRUB_PARSER_STATE_TEXT, '/ ', 1},


On Sat, May 2, 2009 at 8:02 PM, Vladimir 'phcoder' Serbinenko
<address@hidden> wrote:
> Hello. A varname may be terminated by any character which isn't in a set
> [A-Za-z0-9_] and not only space. Here is a fix
>
> --
> Regards
> Vladimir 'phcoder' Serbinenko
>
> _______________________________________________
> Grub-devel mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
>



--
Bean


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--
Regards
Vladimir 'phcoder' Serbinenko

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