\doifelse not working, \doiftextelse breaking

\doifelse not working, \doiftextelse breaking

[Pablo Rodriguez]

Dear list,

I have the following sample:

    \starttext
    \startluacode
    function document.starts_with(str, start)
      if str:sub(1, #start) == start then
        context(start)
      end
    end
    \stopluacode

    \unexpanded\def\startswith[#1][#2]
        {\cldcontext{document.starts_with("#1", "#2")}}

    \startswith[getjobid764572121][getjobid]

    yes:
    \doifelse{\startswith[getjobid764572121][getjobid]}{getjobid}
        {yes}{no}

    no:
    \doifelse{\startswith[getjobid764572121][getjobid]}{}
        {yes}{no}

    %% \doiftextelse{\startswith[getjobid764572121][getjobid]}
        % {yes}{no}
    \stoptext

I don’t know why comparing doesn’t work with \doifelse.

I’m surprised that \doiftextelse breaks when \startswidth if inside.

How could i make \startswith work inside \doiftext?

Or how could I catch positives when command contents start with a given
string?

Many thanks for your help,

Pablo
--
http://www.ousia.tk
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Re: \doifelse not working, \doiftextelse breaking

[Wolfgang Schuster]

Pablo Rodriguez schrieb am 09.10.2020 um 15:58:
> Dear list,
> 
> I have the following sample:
> 
>      \starttext
>      \startluacode
>      function document.starts_with(str, start)
>        if str:sub(1, #start) == start then
>          context(start)
>        end
>      end
>      \stopluacode
> 
>      \unexpanded\def\startswith[#1][#2]
>          {\cldcontext{document.starts_with("#1", "#2")}}


You need a % at the end of the definition, otherwise TeX expects a space 
after the second argument to end the command.

\unexpanded\def\startswith[#1][#2]%
   {...}


To improve your command and allow a space between both arguments you can use

\unexpanded\def\startswith
   {\dodoubleargument\dostartswith}

\def\dostartswith[#1][#2]%
   {...}

or just add a dummy parameter and use #1 and #3 to pass the arguments

\unexpanded\def\startswith[#1]#2[#3]%
   {...}


Wolfgang
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Re: \doifelse not working, \doiftextelse breaking

[Pablo Rodriguez]

On 10/9/20 4:08 PM, Wolfgang Schuster wrote:
> [..]
> You need a % at the end of the definition, otherwise TeX expects a space
> after the second argument to end the command.
>
> \unexpanded\def\startswith[#1][#2]%
>    {...}

Many thanks for your ultra-fast reply, Wolfgang.

Now I see muy mistake. In my previous command definitions with two
arguments, the opening brace was right after the second argument.

> To improve your command and allow a space between both arguments you can use
>
> \unexpanded\def\startswith
>    {\dodoubleargument\dostartswith}
>
> \def\dostartswith[#1][#2]%
>    {...}

Now I see with \dosingleargument, \dodoubleargument and
\dotripleargument are there.

Which are the improvements to the command added by \do*argument?

> or just add a dummy parameter and use #1 and #3 to pass the arguments
>
> \unexpanded\def\startswith[#1]#2[#3]%
>    {...}

This is shorter, but it looks to creepy (even for my code).

Many thanks for your help,

Pablo
--
http://www.ousia.tk
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Re: \doifelse not working, \doiftextelse breaking

[Wolfgang Schuster]

Pablo Rodriguez schrieb am 09.10.2020 um 16:31:
>> To improve your command and allow a space between both arguments you can use
>>
>> \unexpanded\def\startswith
>>     {\dodoubleargument\dostartswith}
>>
>> \def\dostartswith[#1][#2]%
>>     {...}
> Now I see with \dosingleargument, \dodoubleargument and
> \dotripleargument are there.
>
> Which are the improvements to the command added by \do*argument?

You can add a space between both arguments. You version expects this

     \startswith [...][...]

while the extended code allows this

     \startswith [...] [...]

Wolfgang

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Re: \doifelse not working, \doiftextelse breaking

[Pablo Rodriguez]

On 10/9/20 5:10 PM, Wolfgang Schuster wrote:
> Pablo Rodriguez schrieb am 09.10.2020 um 16:31:
>> [...]
>> Which are the improvements to the command added by \do*argument?
>
> You can add a space between both arguments. You version expects this
>
>      \startswith [...][...]
>
> while the extended code allows this
>
>      \startswith [...] [...]

Many thanks for your explanation, Wolfgang.

Pablo
--
http://www.ousia.tk
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