* (z) flag little crazy when '((' closed with *single* ')'
@ 2018-05-28 14:43 Sebastian Gniazdowski
2018-05-28 17:02 ` Jun T.
0 siblings, 1 reply; 3+ messages in thread
From: Sebastian Gniazdowski @ 2018-05-28 14:43 UTC (permalink / raw)
To: Zsh hackers list
Hello,
so how is (( ... )) splitted by (z)?
~ buf='(( i = 1, i <= size, ++ i ))'; printf "|%s|\n" "${(z)buf}"
|(( i = 1, i <= size, ++ i ))|
~ buf='(( i = 1, i <= size, ++ i'; printf "|%s|\n" "${(z)buf}"
|(( i = 1, i <= size, ++ i|
OK, but look what happens when there is single ')', not 0, not 2, but
1 closing parenthesis:
~ buf='(( i = 1, i <= size, ++ i )'; printf "|%s|\n" "${(z)buf}"
|(|
|(|
|i|
|=|
|1,|
|i|
|<|
|=|
|size,|
|++|
|i|
|)|
It splits almost char by char. I wonder if this couldn't be fixed? So
that (z) would split this as:
|(( i = 1, i <= size, ++ i )|
--
Best regards,
Sebastian Gniazdowski
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: (z) flag little crazy when '((' closed with *single* ')'
2018-05-28 14:43 (z) flag little crazy when '((' closed with *single* ')' Sebastian Gniazdowski
@ 2018-05-28 17:02 ` Jun T.
2018-05-29 0:08 ` Bart Schaefer
0 siblings, 1 reply; 3+ messages in thread
From: Jun T. @ 2018-05-28 17:02 UTC (permalink / raw)
To: zsh-workers
> 2018/05/28 23:43, Sebastian Gniazdowski <sgniazdowski@gmail.com> wrote:
>
> ~ buf='(( i = 1, i <= size, ++ i )'; printf "|%s|\n" "${(z)buf}"
> |(|
> |(|
(snip)
> |)|
>
> It splits almost char by char. I wonder if this couldn't be fixed? So
> that (z) would split this as:
>
> |(( i = 1, i <= size, ++ i )|
If the lexer can't find the closing '))' on the command line, it tries
to interpret the opening '((' as '( (', i.e., nested subshells.
zsh% ((echo foo) )
foo
zsh% ((echo foo); echo bar)
foo
bar
zsh% ((echo foo)
subsh>
${(z)...} uses the same lexter, and even if it is OK to make it behave
differently from the command line, we may need to modify the lexer ...
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: (z) flag little crazy when '((' closed with *single* ')'
2018-05-28 17:02 ` Jun T.
@ 2018-05-29 0:08 ` Bart Schaefer
0 siblings, 0 replies; 3+ messages in thread
From: Bart Schaefer @ 2018-05-29 0:08 UTC (permalink / raw)
To: Jun T.; +Cc: zsh-workers
On Mon, May 28, 2018 at 10:02 AM, Jun T. <takimoto-j@kba.biglobe.ne.jp> wrote:
>
> If the lexer can't find the closing '))' on the command line, it tries
> to interpret the opening '((' as '( (', i.e., nested subshells.
The right way to handle this is probably to extend the (Z:...:) flag
to have an option to start parsing in math context.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-05-29 0:08 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2018-05-28 14:43 (z) flag little crazy when '((' closed with *single* ')' Sebastian Gniazdowski
2018-05-28 17:02 ` Jun T.
2018-05-29 0:08 ` Bart Schaefer
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