[9fans] How to do this with [acme | sam | sed ] ?

[9fans] How to do this with [acme | sam | sed ] ?

[Peter A. Cejchan]

## How to do this with [acme | sam | sed ]  ?
# compound commands
# remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh
         [ no idea :-( ]
# remove semicolon before // comments:  xyz;[tab][space]*//  --> xyz
         [ Edit /;[ 	]*\/\// Edit s/;//	# find and remove semicolon
before // comments ]
# prefix to postfix operator: ++i --> i++
         [ Edit s/\+\+[a-zA-Z]+[0-9a-zA-Z]*/&++/ Edit s/\+\+/d]

thanks,
++pac

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Rudolf Sykora]

On 11 January 2013 12:19, Peter A. Cejchan <tyapca7@gmail.com> wrote:
> # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh

This, I believe, can't be achieved only with regexps. I'd write a
small external program and use it as a filter.

> # prefix to postfix operator: ++i --> i++
>          [ Edit s/\+\+[a-zA-Z]+[0-9a-zA-Z]*/&++/ Edit s/\+\+/d]

using the \1 (used to be undocumented on plan9) may be sometimes easier
Edit s/\+\+([A-Za-z]+[A-Za-z0-9])*/\1++/

Ruda

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Peter A. Cejchan]

I am now on p9p and this does not work - at least with (... )*
> using the \1 (used to be undocumented on plan9) may be sometimes easier
> Edit s/\+\+([A-Za-z]+[A-Za-z0-9])*/\1++/>


Petr.

Re: [9fans] How to do this with [acme | sam | sed ] ?

[dexen deVries]

On Friday 11 of January 2013 13:24:12 Peter A. Cejchan wrote:
> I am now on p9p and this does not work - at least with (... )*
> 
> > using the \1 (used to be undocumented on plan9) may be sometimes easier
> > Edit s/\+\+([A-Za-z]+[A-Za-z0-9])*/\1++/>

oughta be 
Edit s/\+\+([A-Za-z]+[A-Za-z0-9]*)/\1++/
the * moves to the left.


also, probably oughta be
Edit ,s/....../g

to work on all lines, and change multiple matches in one go.

-- 
dexen deVries

[[[↓][→]]]


Reality is just a convenient measure of complexity.
                -- Alvy Ray Smith

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Bence Fábián]

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Main problem with the parens one is handling

foo (bar) (baz)

or

foo(
bar(baz)
)

i don't think it's easy with regexes. i'm with Ruda on that one.
writing  a filter would be easier.

-bence

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Re: [9fans] How to do this with [acme | sam | sed ] ?

[erik quanstrom]

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> # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh
>          [ no idea :-( ]

this is made simple since * is "greedy":

Edit s:\((.*)\):\1:g

On Fri Jan 11 06:45:39 EST 2013, rudolf.sykora@gmail.com wrote:
> On 11 January 2013 12:19, Peter A. Cejchan <tyapca7@gmail.com> wrote:
> > # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh
> 
> This, I believe, can't be achieved only with regexps. I'd write a
> small external program and use it as a filter.
> 
> > # prefix to postfix operator: ++i --> i++
> >          [ Edit s/\+\+[a-zA-Z]+[0-9a-zA-Z]*/&++/ Edit s/\+\+/d]
> 
> using the \1 (used to be undocumented on plan9) may be sometimes easier
> Edit s/\+\+([A-Za-z]+[A-Za-z0-9])*/\1++/

should be "Edit s/\+\+([A-Za-z]+[A-Za-z0-9]*)/\1++/"

ideally one should include _ and ¡-￿.

- erik

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Rudolf Sykora]

On 11 January 2013 15:24, erik quanstrom <quanstro@quanstro.net> wrote:
>> # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh
>>          [ no idea :-( ]
>
> this is made simple since * is "greedy":
>
> Edit s:\((.*)\):\1:g
>

Sure, this (the greediness) basically already stands behind the solution
of N. Bercher above (though it was unnecessarily complicated). The problem with
such solutions is that you must always ensure there is just one
'expression' that
you want to be edited in the dot. Being so, the 'clicking' solution
proposed by B. Fabian
might be easier (but it depends). General solution (which would handle multiple
expressions at once), I think, is beyond simple regexps.

Ruda

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Bence Fábián]

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for the third:
/\+\+[a-zA-Z_]+[0-9a-zA-Z_]*/{
x/\+\+/d
a/++/
}

the braces stuff is pretty tough, but maybe someone will have an idea.
however it is really easy to do it by hand in acme.

click on the inside of the opening paren with a double click then click
button 2
(while still holding down button 1 from the double click) this will cut
everything
inside that and the matching paren. then highlight the remaining () and
while
still holding down button 1 push button3.
Looks complicated written down but it's a really quick and easy to learn
sequence.



2013/1/11 Peter A. Cejchan <tyapca7@gmail.com>

> ## How to do this with [acme | sam | sed ]  ?
> # compound commands
> # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh
>          [ no idea :-( ]
> # remove semicolon before // comments:  xyz;[tab][space]*//  --> xyz
>          [ Edit /;[     ]*\/\// Edit s/;//      # find and remove semicolon
> before // comments ]
> # prefix to postfix operator: ++i --> i++
>          [ Edit s/\+\+[a-zA-Z]+[0-9a-zA-Z]*/&++/ Edit s/\+\+/d]
>
> thanks,
> ++pac
>
>

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Re: [9fans] How to do this with [acme | sam | sed ] ?

[Peter A. Cejchan]

how it come i didn't realize that ;-)  !
thanks,
peter

On Fri, Jan 11, 2013 at 12:46 PM, Bence Fábián <begnoc@gmail.com> wrote:
> for the third:
> /\+\+[a-zA-Z_]+[0-9a-zA-Z_]*/{
> x/\+\+/d
> a/++/
> }
>
> the braces stuff is pretty tough, but maybe someone will have an idea.
> however it is really easy to do it by hand in acme.
>
> click on the inside of the opening paren with a double click then click
> button 2
> (while still holding down button 1 from the double click) this will cut
> everything
> inside that and the matching paren. then highlight the remaining () and
> while
> still holding down button 1 push button3.
> Looks complicated written down but it's a really quick and easy to learn
> sequence.
>
>
>
> 2013/1/11 Peter A. Cejchan <tyapca7@gmail.com>
>
>> ## How to do this with [acme | sam | sed ]  ?
>> # compound commands
>> # remove outermost pair of braces:  abcd(x+(y-z))efgh  --> abcdx+(y-z)efgh
>>          [ no idea :-( ]
>> # remove semicolon before // comments:  xyz;[tab][space]*//  --> xyz
>>          [ Edit /;[     ]*\/\// Edit s/;//      # find and remove
>> semicolon
>> before // comments ]
>> # prefix to postfix operator: ++i --> i++
>>          [ Edit s/\+\+[a-zA-Z]+[0-9a-zA-Z]*/&++/ Edit s/\+\+/d]
>>
>> thanks,
>> ++pac
>>
>

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Nicolas Bercher]

On 11/01/2013 12:19, Peter A. Cejchan wrote:
> ## How to do this with [acme | sam | sed ]  ?
> # compound commands
> # remove outermost pair of braces:  abcd(x+(y-z))efgh  -->  abcdx+(y-z)efgh
>           [ no idea :-( ]

Is this enough?

   echo 'abcd(x+(y-z))efgh' | sed 's;\(;;' | sed 's;(.*)\);\1;'

Nicolas

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Peter A. Cejchan]

>   echo 'abcd(x+(y-z))efgh' | sed 's;\(;;' | sed 's;(.*)\);\1;'

Thanks, this is fine for my purpose (porting from C to Go), thanks!
Just removing parens around for and if statements on a single line.

     | 9 sed 's/\(//; s/(.*)\)/\1/'
(linux's sed does not work with it)

best,
++pac

Re: [9fans] How to do this with [acme | sam | sed ] ?

[Nicolas Bercher]

On 11/01/2013 14:10, Peter A. Cejchan wrote:
>>    echo 'abcd(x+(y-z))efgh' | sed 's;\(;;' | sed 's;(.*)\);\1;'
>
> Thanks, this is fine for my purpose (porting from C to Go), thanks!
> Just removing parens around for and if statements on a single line.
>
>       | 9 sed 's/\(//; s/(.*)\)/\1/'
> (linux's sed does not work with it)

Under Linux, you have to switch the syntax between escaped and literal
parenthesis, this works fine:

       | 9 sed 's/(//; s/\(.*\))/\1/'

Nicolas