General ⇒ Number Output inside Info for new Class fails

[EmilioLazo]

Hi!

I have a macro named \Total which holds a number that is the result of some math operations with package fp-upn from fp. I want to show the output of \numprint{\Total} from numprint in a \ClassWarning or \ClassInfo to be shown in the log. (I'm making a class).

If I put \ClassInfo{factura}{\numprint{\Total}} inside the class, the log file reads:

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Class factura Info: ** Total -> Bs.\numprint 1462.50000000000000000

The number is what is held in \Total but this isn't in the format after applying \numprint because \numprint doesn't work inside \ClassInfo.

What trick can be used to show inside \ClassInfo the result of \numprint{\Total}?

I did try:

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\let\TOTAL\numprint\Total
\ClassInfo{factura}{\numprint{\TOTAL}}

also I did try with \expandafter and \protect.

There is a way to hold inside another macro the result of evaluating \numprint{\Total}? This way the macro holds the number and not the operation with \numprint that cannot be evaluated inside \ClassInfo.

Thanks in advance!

[cgnieder]

The \ClassInfo command (like every command that writes something to a file) expands its argument. However, \numprint from the numprint package is not expandable, unfortunately. I don't quite understand what your aim is but you need to find another (expandable) way.

Regards

[EmilioLazo]

Hi Clemens,

For example:

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\documentclass{article}

\usepackage{numprint}
\npthousandsep{.}
\newcommand{\Total}{1234}

\begin{document}

\noindent Total: \Total \\
Total with numprint: \numprint{\Total}

\ClassInfo{article}{The total is: \numprint{\Total}}

\end{document}

Log file reads:

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Class article Info: The total is: \numprint {1234} on input line 12.

Instead of:

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Class article Info: The total is: 1.234 on input line 12.

When you say that \numprint is not expandable means that what I want is not possible with \numprint?

Thanks!

[cgnieder]

When you say that \numprint is not expandable means that what I want is not possible with \numprint?

Exactly. I don't understand why you want \numprint in \ClassInfo in the first place but you have to find another way.

Regards

[EmilioLazo]

When you say that \numprint is not expandable means that what I want is not possible with \numprint?

Exactly. I don't understand why you want \numprint in \ClassInfo in the first place but you have to find another way.

Regards

I want \numprint's in the log file because I'll use grep to find strings, and I prefer having all these strings in the same format. Not only \Total is written to the log; there are 4 macros (4 amounts) written into the log, and after operating them with fp-upn, depending on the operation, some of them ends with floating point and some others without it; i.e. all the macros I want to have shown in the log file are expressed in different formats!

So, there is a need to standarize the way I'll express these quantities, and would be very useful finding a way similar to \numprint{\Total} but that can be called inside a \ClassInfo!

Thanks!!

[cgnieder]

If you would tell us which format you want (rounded? decimal comma instead of point?) and which different forms the input can have maybe someone can come up with something. Until now it is still rather vague...

Regards

[EmilioLazo]

If you would tell us which format you want (rounded? decimal comma instead of point?) and which different forms the input can have maybe someone can come up with something. Until now it is still rather vague...

Regards

You mean using a different way of rouding/formatting the number rather than using \numprint to be \ClassInfo-compliant? if so, what I need is:

- thousand separator: "."
- decimal separator: ","
- two decimal points rounded

[cgnieder]

Ok, here's a way that meets the requirements you've specified. The main point here is that the formatted result is stored in a macro that can be expanded. I've used expl3 (the l3kernel programming layer) for convenience:

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\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{expl3}

% make @ a letter (this is default in a class file):
\makeatletter
% turn expl3-namespace on:
\ExplSyntaxOn
% settings:
\tl_new:N   \l_emilio_thousands_sep_tl
\tl_set:Nn  \l_emilio_thousands_sep_tl { . }
\tl_new:N   \l_emilio_decimal_sep_tl
\tl_set:Nn  \l_emilio_decimal_sep_tl { , }
\int_new:N  \l_emilio_round_places_int
\int_set:Nn \l_emilio_round_places_int { 2 }

% internal token lists:
\tl_new:N   \l_emilio_integer_part_tl
\tl_new:N   \l_emilio_decimal_part_tl

% the main command:
\cs_new_protected:Npn \emilio_format_number:n #1
  {
    \tl_set:Nx \l_tmpa_tl { \fp_eval:n {round( #1 , \l_emilio_round_places_int ) } }
    \exp_after:wN \emilio_format_number:w \l_tmpa_tl .. \q_stop
  }

% internal command that separates integer from decimal part,
% formats them and builds the final result:
\cs_new_protected:Npn \emilio_format_number:w #1.#2.#3 \q_stop
  {
    \emilio_format_integer_part:n { #1 }
    \emilio_format_decimal_part:n { #2 }
    \tl_clear:N \emilio@formatted@number
    \tl_put_right:NV \emilio@formatted@number \l_emilio_integer_part_tl
    \tl_put_right:NV \emilio@formatted@number \l_emilio_decimal_sep_tl
    \tl_put_right:NV \emilio@formatted@number \l_emilio_decimal_part_tl
  }

% format the integer part:
\cs_new_protected:Npn \emilio_format_integer_part:n #1
  {
    \tl_clear:N \l_emilio_integer_part_tl
    \tl_set:Nn \l_tmpa_tl { #1 }
    \tl_reverse:N \l_tmpa_tl
    \int_zero:N \l_tmpa_int
    \tl_map_inline:Nn \l_tmpa_tl
      {
        \int_incr:N \l_tmpa_int
        \tl_put_left:Nn \l_emilio_integer_part_tl { ##1 }
        \int_compare:nT { \int_mod:nn { \l_tmpa_int } { 3 } = 0 }
          { \tl_put_left:NV \l_emilio_integer_part_tl \l_emilio_thousands_sep_tl }
      }
  }

% format the decimal part:
\cs_new_protected:Npn \emilio_format_decimal_part:n #1
  {
    \tl_set:Nn \l_emilio_decimal_part_tl { #1 }
    \int_compare:nT { \tl_count:V \l_emilio_decimal_part_tl < \l_emilio_round_places_int }
      {
        \int_do_while:nNnn
          { \tl_count:V \l_emilio_decimal_part_tl } < { \l_emilio_round_places_int }
          { \tl_put_right:Nn \l_emilio_decimal_part_tl { 0 } }
      }
  }

% macros that can be used outside the expl3-namespace:
\tl_new:N \emilio@formatted@number
\cs_new_eq:NN \emilio@numprint \emilio_format_number:n

% turn expl3-namespace off:
\ExplSyntaxOff
% make @ other again:
\makeatother

\begin{document}

\newcommand\Total{1234}

\makeatletter
\emilio@numprint{1234567890}
\meaning\emilio@formatted@number

\emilio@numprint{\Total}
\meaning\emilio@formatted@number

\emilio@numprint{1234.567890}
\meaning\emilio@formatted@number

\emilio@numprint{12.34567890}
\meaning\emilio@formatted@number

\emilio@numprint{\Total}
\ClassInfo{article}{The total is: \emilio@formatted@number}
\makeatother

\end{document}

Regards

[EmilioLazo]

Ok, here's a way that meets the requirements you've specified. The main point here is that the formatted result is stored in a macro that can be expanded. I've used expl3 (the l3kernel programming layer) for convenience: ...

Hi Clemens!

Really thank you for your help, and your code! but I've compilation errors; the command "\emilio@numprint" is not understood ("Undefined control sequence"), and because I don't understand that LaTeX3 code, I can't debug it now! I'm sorry.

Maybe you've forgotten something or not pasted the whole code!

Can you look at this code again?

Thanks again Clemens,
Best regards.

[cgnieder]

Maybe you've forgotten something or not pasted the whole code!

Can you look at this code again?

It is working as expected. You can verify this if you click on the »OPEN IN WRITELATEX« link above the code box. I suspect (but this is a shot in the very dark) that your TeX distribution isn't up to date.

Regards