Re: [NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
On 1/11/2022 5:22 AM, Aditya Mahajan via ntg-context wrote:
On Tue, 11 Jan 2022, Henning Hraban Ramm via ntg-context wrote:
Am 10.01.22 um 20:21 schrieb Wolfgang Schuster:
Henning Hraban Ramm via ntg-context schrieb am 10.01.2022 um 09:52:
Would it make more sense, or would it be “cleaner” to use a variable?
You can get rid of the temp variable before the command definition but
now you have to access it with a different method in \mymacro, below is
one way (LMTX only) but \setvariable and \getvariable work as well.
\define[1]\mymacro
{\iftok{#1}{\getvalue{previousmymacro}}%
same as last time
\else
it is different from last time
\fi
\setvalue{previousmymacro}{#1}}
That was the approach that I meant. Thank you.
But would you consider one way to be better?
Just for fun: lua code
\startluacode
local previous = nil
interfaces.implement {
name = "mymacro",
public = true,
arguments = "string",
actions = function (current)
if current == previous then
context("same as last time")
else
context("Different!")
end
previous = current
end,
}
\stopluacode
\starttext
\startlines
cat: \mymacro{cat}
cat: \mymacro{cat}
mouse: \mymacro{mouse}
mouse: \mymacro{mouse}
cat: \mymacro{cat}
\stoplines
\stoptext
keep in mind that what you do is global (probably what one wants here):
\startlines
cat: \mymacro{cat}
cat: \mymacro{cat}
{mouse: \mymacro{mouse}}
{mouse: \mymacro{mouse}}
cat: \mymacro{cat}
\stoplines
-
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Re: [NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
On Tue, 11 Jan 2022, Henning Hraban Ramm via ntg-context wrote:
> Am 10.01.22 um 20:21 schrieb Wolfgang Schuster:
> > Henning Hraban Ramm via ntg-context schrieb am 10.01.2022 um 09:52:
> >> Would it make more sense, or would it be “cleaner” to use a variable?
> >
> > You can get rid of the temp variable before the command definition but
> > now you have to access it with a different method in \mymacro, below is
> > one way (LMTX only) but \setvariable and \getvariable work as well.
> >
> > \define[1]\mymacro
> > {\iftok{#1}{\getvalue{previousmymacro}}%
> > same as last time
> > \else
> > it is different from last time
> > \fi
> > \setvalue{previousmymacro}{#1}}
>
> That was the approach that I meant. Thank you.
>
> But would you consider one way to be better?
Just for fun: lua code
\startluacode
local previous = nil
interfaces.implement {
name = "mymacro",
public = true,
arguments = "string",
actions = function (current)
if current == previous then
context("same as last time")
else
context("Different!")
end
previous = current
end,
}
\stopluacode
\starttext
\startlines
cat: \mymacro{cat}
cat: \mymacro{cat}
mouse: \mymacro{mouse}
mouse: \mymacro{mouse}
cat: \mymacro{cat}
\stoplines
\stoptext
Aditya___
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Re: [NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
Am 10.01.22 um 20:21 schrieb Wolfgang Schuster:
Henning Hraban Ramm via ntg-context schrieb am 10.01.2022 um 09:52:
Would it make more sense, or would it be “cleaner” to use a variable?
You can get rid of the temp variable before the command definition but
now you have to access it with a different method in \mymacro, below is
one way (LMTX only) but \setvariable and \getvariable work as well.
\define[1]\mymacro
{\iftok{#1}{\getvalue{previousmymacro}}%
same as last time
\else
it is different from last time
\fi
\setvalue{previousmymacro}{#1}}
That was the approach that I meant. Thank you.
But would you consider one way to be better?
Hraban
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Re: [NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
Henning Hraban Ramm via ntg-context schrieb am 10.01.2022 um 09:52:
Am 09.01.22 um 16:03 schrieb Wolfgang Schuster via ntg-context:
Joel via ntg-context schrieb am 09.01.2022 um 15:16:
Is there a way for a macro to check the previous value of #1, the
last time that same macro was called?
To check is the current value differs from the last one you need a
temp macro where you store the current value at the end of your
command to check it in the next call.
Would it make more sense, or would it be “cleaner” to use a variable?
You can get rid of the temp variable before the command definition but
now you have to access it with a different method in \mymacro, below is
one way (LMTX only) but \setvariable and \getvariable work as well.
\define[1]\mymacro
{\iftok{#1}{\getvalue{previousmymacro}}%
same as last time
\else
it is different from last time
\fi
\setvalue{previousmymacro}{#1}}
Wolfgang
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Re: [NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
Am 09.01.22 um 16:03 schrieb Wolfgang Schuster via ntg-context: Joel via ntg-context schrieb am 09.01.2022 um 15:16: Is there a way for a macro to check the previous value of #1, the last time that same macro was called? To check is the current value differs from the last one you need a temp macro where you store the current value at the end of your command to check it in the next call. Would it make more sense, or would it be “cleaner” to use a variable? Hraban ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___
Re: [NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
Joel via ntg-context schrieb am 09.01.2022 um 15:16:
Is there a way for a macro to check the previous value of #1, the last
time that same macro was called?
Here is a minimum working example, pretending that `\previousvalue` is
equal to #1 from the last time the same macro was called:
[...]
To check is the current value differs from the last one you need a temp
macro where you store the current value at the end of your command to
check it in the next call.
\let\previousmymacro\empty
\define[1]\mymacro
{\edef\currentmymacro{#1}%
\ifx\previousmymacro\currentmymacro
same as last time
\else
it is different from last time
\fi
\let\previousmymacro\currentmymacro}
\starttext
\startlines
cat: \mymacro{cat}
cat: \mymacro{cat}
mouse: \mymacro{mouse}
mouse: \mymacro{mouse}
cat: \mymacro{cat}
\stoplines
\stoptext
Wolfgang
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[NTG-context] How to let a macro check the previous value of #1 the last time the same macro was called?
Is there a way for a macro to check the previous value of #1, the last time
that same macro was called?
Here is a minimum working example, pretending that `\previousvalue` is equal to
#1 from the last time the same macro was called:
\define[1]\mymacro{
\if\previousvalue=#1
same as last time
\else
it is different from last time
\fi
}
\starttext
\mymacro{cat}
\mymacro{cat}
\mymacro{mouse}
\mymacro{mouse}
\mymacro{cat}
\stoptext
This would print:
it is different from last time <--it was never called previously
same as last time
it is different from last time
same as last time
it is different from last time
--Joel
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