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%%
%% Copyright (C) 2021 by Jinwen XU
%% -------------------------------
%%
%% This file 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
%%
\NeedsTeXFormat{LaTeX2e}[2020-10-01]
\ProvidesExplPackage
  {ccref}
  {2021/10/30}
  {}
  {Cross referencing with proper definite articles}
\RequirePackage{cleveref}

\tl_gset:Nn \g_ccref_prepf_tl {}
\tl_gset:Nn \g_ccref_prep_tl {}

\NewDocumentCommand{\ccref}{st-t+O{}m}{
    \IfBooleanTF{ #2 }{
        \tl_gset:Nn \g_ccref_prepf_tl { #4 }
    }{
        \IfBooleanTF{ #3 }{
            \tl_gset:Nn \g_ccref_prep_tl { #4 }
        }{
            \str_case_e:nn { \ccref_prep_mode:nn } {
                { - } { \tl_gset:Nn \g_ccref_prepf_tl { #4 } }
                { + } { \tl_gset:Nn \g_ccref_prep_tl  { #4 } }
            }
        }
    }
    \IfBooleanTF{ #1 } { \cref*{#5} } { \cref{#5} }
    \tl_gset:Nn \g_ccref_prep_tl {}
}

\NewDocumentCommand{\ccmarkart}{m}{
    \ccref_contraction:nn { \tl_use:N \g_ccref_prep_tl }{
        \ccref_contraction:nn { \tl_use:N \g_ccref_prepf_tl }{#1}
    }
    \tl_gset:Nn \g_ccref_prepf_tl {}
}

\cs_set:Npn \ccref_prep_mode:nn {
    \str_case_e:nn { \languagename }
    {
        {french}        { + }
        {italian}       { + }
        {spanish}       { - }
        {portuguese}    { + }
        {brazilian}     { + }
    }
}

\cs_set:Npn \ccref_contraction:nn #1#2 {
    \str_if_eq:eeTF {#1} {} {#2} {
        \str_case_e:nn { \languagename }
        {
            {french}{
                \str_case_e:nnF {#1~#2} {
                    {à~le}      {au}
                    {à~la}      {à~la}
                    {à~l'}      {à~l'}
                    {à~les}     {aux}
                    {de~le}     {du}
                    {de~la}     {de~la}
                    {de~l'}     {de~l'}
                    {de~les}    {des}
                }{#1~#2}
            }
            {italian}{
                \str_case_e:nnF {#1~#2} {
                    {a~il}      {al}
                    {a~lo}      {allo}
                    {a~l'}      {all'}
                    {a~la}      {alla}
                    {di~il}     {del}
                    {di~lo}     {dello}
                    {di~l'}     {dell'}
                    {di~la}     {della}
                    {da~il}     {dal}
                    {da~lo}     {dallo}
                    {da~l'}     {dall'}
                    {da~la}     {dalla}
                    {in~il}     {nel}
                    {in~lo}     {nello}
                    {in~l'}     {nell'}
                    {in~la}     {nella}
                    {su~il}     {sul}
                    {su~lo}     {sullo}
                    {su~l'}     {sull'}
                    {su~la}     {sulla}
                    {a~i}       {ai}
                    {a~gli}     {agli}
                    {a~le}      {alle}
                    {di~i}      {dei}
                    {di~gli}    {degli}
                    {di~le}     {delle}
                    {da~i}      {dai}
                    {da~gli}    {dagli}
                    {da~le}     {dalle}
                    {in~i}      {nei}
                    {in~gli}    {negli}
                    {in~le}     {nelle}
                    {su~i}      {sui}
                    {su~gli}    {sugli}
                    {su~le}     {sulle}
                }{#1~#2}
            }
            {portuguese}{
                \str_case_e:nnF {#1~#2} {
                    {a~o}       {ao}
                    {a~a}       {à}
                    {a~os}      {aos}
                    {a~as}      {às}
                    {de~o}      {do}
                    {de~a}      {da}
                    {de~os}     {dos}
                    {de~as}     {das}
                    {em~o}      {no}
                    {em~a}      {na}
                    {em~os}     {nos}
                    {em~as}     {nas}
                }{#1~#2}
            }
            {brazilian}{
                \str_case_e:nnF {#1~#2} {
                    {a~o}       {ao}
                    {a~a}       {à}
                    {a~os}      {aos}
                    {a~as}      {às}
                    {de~o}      {do}
                    {de~a}      {da}
                    {de~os}     {dos}
                    {de~as}     {das}
                    {em~o}      {no}
                    {em~a}      {na}
                    {em~os}     {nos}
                    {em~as}     {nas}
                }{#1~#2}
            }
            {spanish}{
                \str_case_e:nnF {#1~#2} {
                    {a~el}      {al}
                    {de~el}     {del}
                }{#1~#2}
            }
        }
    }
}
\endinput
%%
%% End of file `ccref.sty'.