% \iffalse
% File: numberpt.dtx
%
% Copyright (C) 2019 Miguel V. S. Frasson (mvsfrasson@gmail.com)
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008/05/04 or later.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is the author.
%
% This work consists of the files numberpt.dtx and numberpt.ins
% and the derived file numberpt.sty.
% 
%<*driver>
\documentclass{ltxdoc}
\usepackage{doc}
\usepackage[T1]{fontenc}
\usepackage{amstext,makeidx,multicol}
\usepackage{numberpt}
\begin{document}
  \DocInput{numberpt.dtx}
\end{document}
%</driver>
% \fi
%
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% \StopEventually
%
% \changes{1.0}{2019/07/13}{initial version}
%
% \MakeShortVerb+ 
%
% \title{\textsf{numberpt}: counters spelled out in Portuguese}
% \author{Miguel Vin\'\i cius Santini Frasson}
% \date{2019--07--13 version 1.0}
%
% \maketitle
%
% \tableofcontents
%
% \section{Introduction}
%
% The package \textsf{numberpt} provides a counter style like
% +\arabic+, +\alph+ etc., but that spells numbers in Portuguese, like
% ``um'' (one in Portuguese), ``dois'' (two), ``tr\^es'' (three),
% \ldots, up to ``novecentos e noventa e nove mil novecentos e noventa
% e nove'' (999{,}999).  There are counter commands to output the text
% in ``lowercase'', ``First word capitalized'', ``All Words
% Capitalized'' ou in ``UPPERCASE''.
%
% \section{User commands}
%
% \newcommand{\countername}{\texttt{\textit{counter}}}
%
% \DescribeMacro{\numberpt}
% \DescribeMacro{\Numberpt}
% \DescribeMacro{\NumberPt}
% \DescribeMacro{\NUMBERPT}
%    Macros to output counters in Portuguese  in ``lowercase'',
%    ``Capitalized'' or in ``UPPERCASE''---:\\
%    +  \numberpt{+\countername+}+ (ex: vinte e tr\^es),\\
%    +  \Numberpt{+\countername+}+ (ex: Vinte e tr\^es),\\
%    +  \NumberPt{+\countername+}+ (ex: Vinte E Tr\^es),\\
%    +  \NUMBERPT{+\countername+}+ (ex: VINTE E TR\^ES).
%
%    Example:
%
%\begin{verbatim}
%\renewcommand{\thechapter}{\Numberpt{chapter}}
%\end{verbatim}
% will produce chapter headers like:
%
% \centerline{Cap\'itulo Um}
% \centerline{Cap\'itulo Dois}
%
% By default, command +\NumberPt+ for all capitalized numbers output
% connectors ``e'' in uppercase. For example, if +page+ counter is 23,
% then +\NumberPt{page}+ $\to$ Vinte E Tr\^es.  To change this behavior
% (connector ``e'' in lowercase), use starred versions +\NumberPt*+.
%
% \section{Package options}
%
% \DescribeMacro{catorze}
% \DescribeMacro{quatorze}
% For 14, both forms ``catorze'' e ``quatorze'' are correct.  Use
% package option +catorze+ (default) or +quatorze+ to select which
% form is used.
%
% \DescribeMacro{dezesseis}
% \DescribeMacro{dezasseis}
% In Brazil, the forms for 16, 17 and 19 are ``dezesseis'',
% ``dezessete'' and ``de\-ze\-no\-ve''.  In Portugal, the forms are
% ``dezasseis'', ``dezassete'' and ``dezanove''. To select Brazilian
% Portuguese forms (default), use option +dezesseis+; for European
% Portuguese form, use +dezasseis+.
%
% \section{Code}
%
% \subsection{Package identification}
%
%    \begin{macrocode}
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{numberpt}[2019/07/12 v1.0 Counters as numbers in Portuguese]
%    \end{macrocode}
%
% We use \LaTeX3 in this package.
%
%    \begin{macrocode}
\RequirePackage{expl3,xparse}
\ExplSyntaxOn
%    \end{macrocode}
%
% \subsection{Package options}
% Package options declarations +catorze+ or +quatorze+, and
% +dezasseis+ or +dezesseis+.  Creating undocumented ``user commands''
% +\NumberPTcatorze+, +\NumberPTquatorze+, +\NumberPTdezasseis+ and
% +\NumberPTdezasseis+ that set switches.
%
%    \begin{macrocode}
\bool_new:N \NumberPT_catorze
\bool_new:N \NumberPT_dezesseis
\newcommand{\NumberPTcatorze}{\bool_set_true:N  \NumberPT_catorze}
\newcommand{\NumberPTquatorze}{\bool_set_false:N  \NumberPT_catorze}
\DeclareOption{ catorze  }{ \NumberPTcatorze }
\DeclareOption{ quatorze }{ \NumberPTquatorze }
\ExecuteOptions{ catorze }
\newcommand{\NumberPTdezesseis}{\bool_set_true:N  \NumberPT_dezesseis}
\newcommand{\NumberPTdezasseis}{\bool_set_false:N  \NumberPT_dezesseis}
\DeclareOption{ dezasseis  }{ \NumberPTdezasseis}
\DeclareOption{ dezesseis  }{ \NumberPTdezesseis}
\ExecuteOptions{ dezesseis }
\ProcessOptions
%    \end{macrocode}
%
% \subsection{Case handling}
% Command +\NumberPT_case:nn+ and switches govern capitalization.
%
%    \begin{macrocode}
\bool_new:N \NumberPT_capital
\bool_new:N \NumberPT_capitalfirst
\bool_new:N \NumberPT_capitale
\bool_new:N \NumberPT_uppercase
\cs_new:Nn \NumberPT_case:nn {
  \bool_if:NTF \NumberPT_capital {
    \uppercase { #1 }
  } {
    #1
  }
  \bool_if:NTF \NumberPT_uppercase {
    \uppercase { #2 }
  } {
    #2 }
  \bool_if:NT \NumberPT_capitalfirst {
    \bool_set_false:N \NumberPT_capital
  }
}
%    \end{macrocode}
%
% \subsection{Output for numbers with 1, 2 or 3 digits}
% +\NumberPT_u:n{+$U$+}+ takes digit $U$ and outputs ``zero'', ``um'',
% ``dois'', \dots, ``nove''.
%
%    \begin{macrocode}
\cs_new:Nn \NumberPT_u:n {
  \if_case:w #1
    \NumberPT_case:nn {z}{ero}\or:
    \NumberPT_case:nn {u}{m}\or:
    \NumberPT_case:nn {d}{ois}\or:
    \NumberPT_case:nn {t}{r\^es}\or:
    \NumberPT_case:nn {q}{uatro}\or:
    \NumberPT_case:nn {c}{inco}\or:
    \NumberPT_case:nn {s}{eis}\or:
    \NumberPT_case:nn {s}{ete}\or:
    \NumberPT_case:nn {o}{ito}\or:
    \NumberPT_case:nn {n}{ove}%
  \fi:}
%    \end{macrocode}
%
% Command +\NumberPT_e_u:n{+$U$+}+ outputs `` e um'' etc, if $U>0$,
% otherwise outputs nothing.
%
%    \begin{macrocode}
\cs_new:Nn \NumberPT_e_u:n {
  \int_compare:nNnT #1 > 0 {
    \space \bool_if:nTF \NumberPT_capitale {E}{e} \space \NumberPT_u:n #1
  }
}
%    \end{macrocode}
%
% Commands +\NumberPT_du:nn{+$D$+}{+$U$+}+ and
% +\NumberPT_e_du:nn{+$D$+}{+$U$+}+ are similar, with 2 digits.
% Numbers from 0 to 19 are all special cases.
%
%    \begin{macrocode}
\cs_new:Nn \NumberPT_du:nn {
  \if_case:w #1 % #1=0
    \NumberPT_u:n #2
  \or: % #1=1
    \if_case:w #2
      \NumberPT_case:nn {d}{ez}\or:
      \NumberPT_case:nn {o}{nze}\or:
      \NumberPT_case:nn {d}{oze}\or:
      \NumberPT_case:nn {t}{reze}\or:
      \bool_if:NTF \NumberPT_catorze {
        \NumberPT_case:nn {c}{atorze}
      } {
        \NumberPT_case:nn {q}{uatorze}
      }\or:
      \NumberPT_case:nn {q}{uinze}\or:
      \bool_if:NTF \NumberPT_dezesseis {
        \NumberPT_case:nn {d}{ezesseis}
      } {
        \NumberPT_case:nn {d}{ezasseis}
      }\or:
      \bool_if:NTF \NumberPT_dezesseis {
        \NumberPT_case:nn {d}{ezessete}
      } {
        \NumberPT_case:nn {d}{ezassete}
      }\or:
      \NumberPT_case:nn {d}{ezoito}\or:
      \bool_if:NTF \NumberPT_dezesseis {
        \NumberPT_case:nn {d}{ezenove}
      } {
        \NumberPT_case:nn {d}{ezanove}
      }\or:
    \fi:
  \or: % #1>1
    \NumberPT_case:nn {v}{inte} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {t}{rinta} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {q}{uarenta} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {c}{inquenta} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {s}{essenta} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {s}{etenta} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {o}{itenta} \NumberPT_e_u:n #2
  \or:
    \NumberPT_case:nn {n}{oventa} \NumberPT_e_u:n #2
  \fi:
}

\cs_new:Nn \NumberPT_e_du:nn {
  \int_compare:nNnT { #1 + #2 } > 0 {
    \space \bool_if:nTF \NumberPT_capitale {E}{e} \space \NumberPT_du:nn #1 #2
  }
}
%    \end{macrocode}
%
% +\NumberPT_cdu:nnn{+$C$+}{+$D$+}{+$U$+}+ takes digits $C$, $D$ and $U$
% and outputs correspondent number.
%
%    \begin{macrocode}
\cs_new:Nn \NumberPT_cdu:nnn {%
  \if_case:w #1 % #1=0
    \NumberPT_du:nn #2 #3
  \or: % #1=1
    \int_compare:nNnTF { #2 + #3 } = 0  % "cem" if 00 or "cento e " + finish
      { \NumberPT_case:nn {c}{em} }
      { \NumberPT_case:nn {c}{ento} \NumberPT_e_du:nn #2 #3 }
  \or: % #1>1
    \NumberPT_case:nn {d}{uzentos}  \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {t}{rezentos} \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {q}{uatrocentos} \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {q}{uinhentos} \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {s}{eiscentos} \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {s}{etecentos} \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {o}{itocentos} \NumberPT_e_du:nn #2 #3
  \or:
    \NumberPT_case:nn {n}{ovecentos} \NumberPT_e_du:nn #2 #3
  \fi:
}
%    \end{macrocode}
%
% \subsection{Output for numbers with 4, 5 or 6 digits}
%
% \DeleteShortVerb+
% If a number $abcdef$ has between 4 and 6 digits, the rule for
% spelling this number is\footnote{See
% \texttt{www.languagesandnumbers.com/como-contar-em-portugues-brasil/pt/por-bra/}}:
% \begin{itemize}
% \item spell the 3-digits number $abc$ (unless $abc=001$) + ``mil''
% \item stop if $def=000$, otherwise:
% \item add the connector ``e'' for numbers
%   \begin{itemize}
%   \item finishing in 00, \emph{i.e.}, $e+f=0$
%   \item without digit for hundreds , \emph{i.e.}, $d=0$
%   \end{itemize}%
% \item spell the 3-digits number $def$
% \end{itemize}
%
%    \begin{macrocode}
\cs_new:Nn \NumberPT_e_cdu:nnn {
  \int_compare:nNnF {#1 + #2 + #3} = 0 {
    \space
    \bool_if:nT { \int_compare_p:nNn #1 = 0 || \int_compare_p:nNn {#2 + #3} = 0 }
    {
      \bool_if:nTF \NumberPT_capitale {E}{e}
      \space
    }
    \NumberPT_cdu:nnn #1 #2 #3
  }
}
%    \end{macrocode}
%
% Output for numbers with up to 6 digits.
%
%    \begin{macrocode}
\cs_new:Nn \NumberPT_abcdef:nnnnnn {
  \int_compare:nNnTF {#1 + #2 + #3} = 0 %abc=000
  {
    \NumberPT_cdu:nnn #4 #5 #6
  }
  % else
  {
    % avoid "um mil", using just "mil"
    \int_compare:nNnF {100 * #1 + 10 * #2 + #3} = 1 {
      \NumberPT_cdu:nnn #1 #2 #3
      \space
    }
    \NumberPT_case:nn {m}{il}
    \NumberPT_e_cdu:nnn #4 #5 #6
  }
}
\cs_generate_variant:Nn \NumberPT_abcdef:nnnnnn {xxxxxx}
%    \end{macrocode}
%
% \subsection{Conversion from counter to digits}
%
% \MakeShortVerb+
% Now, conversion from counter to digits.  digits will be stored in
% macros +\NumberPT_digit_u+, +\NumberPT_digit_d+, +\NumberPT_digit_c+.
% Decomposition is done with mod.
%
%    \begin{macrocode}
\int_new:N \NumberPT_digit_u
\int_new:N \NumberPT_digit_d
\int_new:N \NumberPT_digit_c
\int_new:N \NumberPT_digit_um
\int_new:N \NumberPT_digit_dm
\int_new:N \NumberPT_digit_cm

\cs_new:Nn \NumberPT_decompose:n {
  \int_set:Nn \l_tmpa_int { #1 }
  \int_set:Nn \NumberPT_digit_u { \int_mod:nn { \l_tmpa_int } { 10 } }
  \int_set:Nn \l_tmpa_int { ( \l_tmpa_int - \NumberPT_digit_u ) / 10 }
  \int_set:Nn \NumberPT_digit_d { \int_mod:nn { \l_tmpa_int } { 10 } }
  \int_set:Nn \l_tmpa_int { ( \l_tmpa_int - \NumberPT_digit_d ) / 10 }
  \int_set:Nn \NumberPT_digit_c { \int_mod:nn { \l_tmpa_int } { 10 } }
  \int_set:Nn \l_tmpa_int { ( \l_tmpa_int - \NumberPT_digit_c ) / 10 }
  \int_set:Nn \NumberPT_digit_um { \int_mod:nn { \l_tmpa_int } { 10 } }
  \int_set:Nn \l_tmpa_int { ( \l_tmpa_int - \NumberPT_digit_um ) / 10 }
  \int_set:Nn \NumberPT_digit_dm { \int_mod:nn { \l_tmpa_int } { 10 } }
  \int_set:Nn \l_tmpa_int { ( \l_tmpa_int - \NumberPT_digit_dm ) / 10 }
  \int_set:Nn \NumberPT_digit_cm { \int_mod:nn { \l_tmpa_int } { 10 } }
}
%    \end{macrocode}
%
% Now, command that prints counter: +\NumberPT_print_counter:n+.
% Declaring error message in case counter is out of range from 0 to 999.
% Even in case of this error, falls back to arabic number.
%
%    \begin{macrocode}
\msg_new:nnn
{ numberpt } { counter-out-of-range } {Counter~`#1'~out~of~range~0~...~999999}

\cs_new:Nn \NumberPT_print_counter:n {
  \int_set:Nn \l_tmpa_int { \value{#1} }
  \bool_if:nTF {
    \int_compare_p:n { \l_tmpa_int >= 0 } &&
    \int_compare_p:n { \l_tmpa_int < 1000000 }
  }
  {
    \NumberPT_decompose:n { \l_tmpa_int }
    \NumberPT_abcdef:xxxxxx
    { \int_use:N \NumberPT_digit_cm }
    { \int_use:N \NumberPT_digit_dm }
    { \int_use:N \NumberPT_digit_um }
    { \int_use:N \NumberPT_digit_c  }
    { \int_use:N \NumberPT_digit_d  }
    { \int_use:N \NumberPT_digit_u  }
  }
  {
    \msg_error:nnn { numberpt } { counter-out-of-range } {#1}
    \arabic{#1}
  }
}
%    \end{macrocode}
%
% \subsection{User macros}
% Finally, user macros.  Each macro sets switches for capitalization
% and calls +\NumberPT_print_counter:n+.
%    \begin{macrocode}
\NewDocumentCommand{\numberpt}{m}{
  \bool_set_false:N \NumberPT_capital
  \bool_set_false:N \NumberPT_capitale
  \bool_set_false:N \NumberPT_uppercase
  \NumberPT_print_counter:n { #1 }
}

\NewDocumentCommand{\NumberPt}{s m}{
  \bool_set_true:N \NumberPT_capital
  \bool_set:Nn \NumberPT_capitale {! #1}
  \bool_set_false:N \NumberPT_capitalfirst
  \bool_set_false:N \NumberPT_uppercase
  \NumberPT_print_counter:n { #2 }
}

\NewDocumentCommand{\Numberpt}{m}{
  \bool_set_true:N \NumberPT_capital
  \bool_set_false:N \NumberPT_capitale
  \bool_set_true:N \NumberPT_capitalfirst
  \bool_set_false:N \NumberPT_uppercase
  \NumberPT_print_counter:n { #1 }
}

\NewDocumentCommand{\NUMBERPT}{m}{
  \bool_set_true:N \NumberPT_capital
  \bool_set_true:N \NumberPT_capitale
  \bool_set_true:N \NumberPT_uppercase
  \NumberPT_print_counter:n { #1 }
}
%    \end{macrocode}
%
% End of code.
%    \begin{macrocode}
\ExplSyntaxOff
\endinput
%    \end{macrocode}
%
% \section{Tests}
%
% Here we create a counter and spell the numbers for some selected values.
%
% \newcounter{test}
% \newcommand{\test}[1]{\par\setcounter{test}{#1}#1: \numberpt{test}}
% \newcommand{\Test}[1]{\par\setcounter{test}{#1}#1: \Numberpt{test}}
% \newcommand{\TesT}[1]{\par\setcounter{test}{#1}#1: \NumberPt{test}}
% \newcommand{\TesTs}[1]{\par\setcounter{test}{#1}#1: \NumberPt*{test}}
% \newcommand{\TEST}[1]{\par\setcounter{test}{#1}#1: \NUMBERPT{test}} 
%
% \subsection{Tests with \texttt{\protect\string\numberpt}}
%
% \begin{multicols}{3}
% \test{1}
% \test{2}
% \test{3}
% \test{4}
% \test{5}
% \test{6}
% \test{7}
% \test{8}
% \test{9}
% \test{10}
% \test{11}
% \test{12}
% \test{13}
% \test{14}
% \test{15}
% \test{16}
% \test{17}
% \test{18}
% \test{19}
% \test{20}
% \test{21}
% \test{22}
% \test{30}
% \test{31}
% \test{40}
% \test{41}
% \test{50}
% \test{51}
% \test{60}
% \test{61}
% \test{70}
% \test{71}
% \test{80}
% \test{81}
% \test{90}
% \test{91}
% \test{100}
% \test{101}
% \end{multicols}
% \subsection{Tests with \texttt{\protect\string\Numberpt}}
% \begin{multicols}{2}
% \Test{199}
% \Test{200}
% \Test{201}
% \Test{300}
% \Test{301}
% \Test{400}
% \Test{401}
% \Test{500}
% \Test{501}
% \end{multicols}
% \subsection{Tests with \texttt{\protect\string\NumberPt}}
% \begin{multicols}{2}
% \TesT{600}
% \TesT{601}
% \TesT{700}
% \TesT{701}
% \end{multicols}
% \subsection{Tests with \texttt{\protect\string\NumberPt*}}
% \begin{multicols}{2}
% \TesTs{800}
% \TesTs{801}
% \TesTs{900}
% \TesTs{999}
% \end{multicols}
% \subsection{Tests with \texttt{\protect\string\NUMBERPT}}
% \begin{multicols}{1}
% \end{multicols}
% \TEST{1000}
% \TEST{1001}
% \TEST{1099}
% \TEST{1100}
% \TEST{1101}
% \TEST{2000}
% \TEST{2001}
% \TEST{2099}
% \TEST{2100}
% \TEST{2101}
% \TEST{2200}
% \TEST{2201}
% \TEST{2299}
% \TEST{2300}
%
% \subsection{Tests with 14, 16, 17, 19}
%
% \begin{quote}
%   
% \end{quote}
% \NumberPTcatorze
% \test{14} (must be ``catorze'')\medskip
% \NumberPTquatorze
% \test{14} (must be ``quatorze'')\bigskip
%
% \NumberPTdezasseis
% \test{16} (must be ``dezasseis'')
% \test{17} (must be ``dezassete'')
% \test{19} (must be ``dezanove'')\medskip
% \NumberPTdezesseis
% \test{16} (must be ``dezesseis'')
% \test{17} (must be ``dezessete'')
% \test{19} (must be ``dezenove'')
% \end{document}