Symbol's value as a variable is void: marker

Symbol's value as a variable is void: marker

[Lennart Borgman]

Why do I get the error from byte compiling

   mumamo-fun.el:2011:52:Error: Symbol's value as variable is void: marker

for this line

   (defun mumamo-whole-line-chunk (pos min max marker mode)

Re: Symbol's value as a variable is void: marker

[martin rudalics]

 > Why do I get the error from byte compiling
 >
 >    mumamo-fun.el:2011:52:Error: Symbol's value as variable is void: marker
 >
 > for this line
 >
 >    (defun mumamo-whole-line-chunk (pos min max marker mode)

I suppose because somewhere in your code `marker' _is_ void but the byte-compiler
finds this occurrence first when it builds the line-numbers.

martin

Re: Symbol's value as a variable is void: marker

[Lennart Borgman]

On Thu, May 28, 2009 at 5:16 PM, martin rudalics <rudalics@gmx.at> wrote:
>> Why do I get the error from byte compiling
>>
>>    mumamo-fun.el:2011:52:Error: Symbol's value as variable is void: marker
>>
>> for this line
>>
>>    (defun mumamo-whole-line-chunk (pos min max marker mode)
>
> I suppose because somewhere in your code `marker' _is_ void but the
> byte-compiler
> finds this occurrence first when it builds the line-numbers.

Good guess, it comes from this

          let ( (pattern (rx bol (0+ blank) (eval marker) blank)))

rx is a macro and I maybe should do something else on the line above, but what?

Re: Symbol's value as a variable is void: marker

[martin rudalics]

> Good guess, it comes from this
> 
>           let ( (pattern (rx bol (0+ blank) (eval marker) blank)))
> 
> rx is a macro and I maybe should do something else on the line above, but what?

What is "marker"?  A buffer position?

martin

Re: Symbol's value as a variable is void: marker

[Lennart Borgman]

On Thu, May 28, 2009 at 7:10 PM, martin rudalics <rudalics@gmx.at> wrote:
>> Good guess, it comes from this
>>
>>          let ( (pattern (rx bol (0+ blank) (eval marker) blank)))
>>
>> rx is a macro and I maybe should do something else on the line above, but
>> what?
>
> What is "marker"?  A buffer position?

No, it is a string.

Re: Symbol's value as a variable is void: marker

[Stefan Monnier]

> rx is a macro and I maybe should do something else on the line above,
> but what?

C-h f rx RET says:

   [...]
   Note that `rx' is a Lisp macro; when used in a Lisp program being
    compiled, the translation is performed by the compiler.
   See `rx-to-string' for how to do such a translation at run-time.
   [...]


-- Stefan

Re: Symbol's value as a variable is void: marker

[Lennart Borgman]

On Thu, May 28, 2009 at 8:20 PM, Stefan Monnier
<monnier@iro.umontreal.ca> wrote:
>> rx is a macro and I maybe should do something else on the line above,
>> but what?
>
> C-h f rx RET says:
>
>   [...]
>   Note that `rx' is a Lisp macro; when used in a Lisp program being
>    compiled, the translation is performed by the compiler.
>   See `rx-to-string' for how to do such a translation at run-time.
>   [...]

Thanks, I see - or I hope I do. Is this what I should do:

           ;;(pattern (rx bol (0+ blank) (eval marker) blank))
           (pattern (rx-to-string (list 'and 'bol (list '0+ 'blank)
marker 'blank) t))

Re: Symbol's value as a variable is void: marker

[Andreas Schwab]

Lennart Borgman <lennart.borgman@gmail.com> writes:

> Thanks, I see - or I hope I do. Is this what I should do:
>
>            ;;(pattern (rx bol (0+ blank) (eval marker) blank))
>            (pattern (rx-to-string (list 'and 'bol (list '0+ 'blank)
> marker 'blank) t))

Or even:

           (pattern (rx-to-string `(and bol (0+ blank) ,marker blank) t))

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Symbol's value as a variable is void: marker

[Lennart Borgman]

On Fri, May 29, 2009 at 12:30 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> Lennart Borgman <lennart.borgman@gmail.com> writes:
>
>> Thanks, I see - or I hope I do. Is this what I should do:
>>
>>            ;;(pattern (rx bol (0+ blank) (eval marker) blank))
>>            (pattern (rx-to-string (list 'and 'bol (list '0+ 'blank)
>> marker 'blank) t))
>
> Or even:
>
>           (pattern (rx-to-string `(and bol (0+ blank) ,marker blank) t))

Thanks Andreas, that is much easier to read and write.

BTW is that syntax really documented and explained in the manual? I do
not mean for rx-to-string, but more generally. I thnk I found out
about it when reading some code, but I never saw it in the manual.

Re: Symbol's value as a variable is void: marker

[Lennart Borgman]

On Fri, May 29, 2009 at 2:54 AM, Stephen J. Turnbull <stephen@xemacs.org> wrote:
> Lennart Borgman writes:
>
>  > BTW is that syntax really documented and explained in the manual? I do
>  > not mean for rx-to-string, but more generally. I thnk I found out
>  > about it when reading some code, but I never saw it in the manual.
>
> Try searching for "backquote".

Thanks, yes, but the node

   (info "(elisp) Backquote")

gives me the impression that this only works in macros, because the
node is located under macros.

Re: Symbol's value as a variable is void: marker

[Stephen J. Turnbull]

Lennart Borgman writes:

 > BTW is that syntax really documented and explained in the manual? I do
 > not mean for rx-to-string, but more generally. I thnk I found out
 > about it when reading some code, but I never saw it in the manual.

Try searching for "backquote".

Re: Symbol's value as a variable is void: marker

[Stephen J. Turnbull]

Lennart Borgman writes:

 > Thanks, yes, but the node
 > 
 >    (info "(elisp) Backquote")
 > 
 > gives me the impression that this only works in macros, because the
 > node is located under macros.

I guess you would be more likely to find it under cons cells and list
structure?

Re: Symbol's value as a variable is void: marker

[Lennart Borgman]

On Fri, May 29, 2009 at 7:03 AM, Stephen J. Turnbull <stephen@xemacs.org> wrote:
> Lennart Borgman writes:
>
>  > Thanks, yes, but the node
>  >
>  >    (info "(elisp) Backquote")
>  >
>  > gives me the impression that this only works in macros, because the
>  > node is located under macros.
>
> I guess you would be more likely to find it under cons cells and list
> structure?

I think it would fit better under "(elisp) Quoting" and I see now that
there is a reference now to "(elisp) Backquotes" from that node.

Maybe the only thing that is needed is that "(elisp) Backquotes"
mentions that it is not only for macros and that the "(elisp) Quoting"
got a small example of the use of backquote. I think that would help
those new to lisp/elisp very much.