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Pasar caracteres especiales de escape para usarlos como URL a través de macros

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Pasar caracteres especiales de escape para usarlos como URL a través de macros

De una pregunta anterior en adelanteEscapar de caracteres especiales para usarlos como URL, usar \stringpara escapar los caracteres especiales de URL en el segundo ejemplo funciona muy bien:

\DefineMyFormatLinkParameters{%
    *[Main Search Site]{Google}{http://www.google.com},
    {people.brunel.ac.uk}{http://people.brunel.ac.uk/\string~mastmmg/ssguide/set\string_work.html\string#4\string_32},
    {Yahoo}{http://www.yahoo.com}
}

\DefineMyFormatLinkParametersdefine una lista de parámetros en \MyFormatLinkParameters:

\newcommand*{\DefineMyFormatLinkParameters}[1]{%
    \edef\MyFormatLinkParameters{#1}%
}%

Sin embargo, si en lugar de eso uso

\newcommand*{\DefineMyFormatLinkParametersNew}[2][TypeB]{%
    %\edef\MyFormatLinkParametersNew{#2}% Don't assign it here directly, 
                                        % but pass it along 
    \IfStrEqCase{#1}{%
        {TypeA}{\DefineMyFormatLinkParametersTypeA{#2}}%
        {TypeB}{\DefineMyFormatLinkParametersTypeB{#2}}%
    }[\typeout{*** ERROR: Unknown link type: #1}]%
}%

que pasa la lista de parámetros a otra macro, \DefineMyFormatLinkParametersTypeAo \DefineMyFormatLinkParametersTypeB, hay un problema en el procesamiento de los caracteres especiales. Todo funciona bien para los casos que no utilizan caracteres TeX especiales según el MWE a continuación:

ingrese la descripción de la imagen aquí

Notas

  • En MWE, el caso del problema se comenta en la llamada a \DefineMyFormatLinkParametersNew. Descomente la people.brunel.ac.uklínea para reproducir el problema.

Código:

\documentclass{article}
\usepackage{url}
\usepackage{pgffor}
\usepackage{xparse}
\usepackage{xstring}
\usepackage[colorlinks=true]{hyperref}

\NewDocumentCommand{\FormatLinks}{%
    s%   #1 =* not used yet
    O{}% #2 = optional title
    m%   #3 = Mandatory title
    m%   #4 = URL Link
}{%
    \par
    \hspace*{1.0cm}\href{#4}{#3\IfValueT{#2}{~(#2)}}%
}%

\newcommand*{\MyFormatLinkParameters}{}% Initialize
\newcommand*{\DefineMyFormatLinkParameters}[1]{%
    \edef\MyFormatLinkParameters{#1}%
}%


%% \DefineMyFormatLinkParametersNew (compared to \DefineMyFormatLinkParameters) has 
%% one extra level of macro processing based on the optional #1 parameter
\newcommand*{\Title}{}%
\newcommand*{\DefineMyFormatLinkParametersTypeA}[1]{%
    \edef\MyFormatLinkParametersNew{#1}%
    \def\Title{Type A Links}%
}%
\newcommand*{\DefineMyFormatLinkParametersTypeB}[1]{%
    \edef\MyFormatLinkParametersNew{#1}%
    \def\Title{Type B Links}%
}%
\newcommand*{\DefineMyFormatLinkParametersNew}[2][TypeB]{%
    %\edef\MyFormatLinkParametersNew{#2}% Don't assign it here directly, 
                                        % but pass it along 
    \IfStrEqCase{#1}{%
        {TypeA}{\DefineMyFormatLinkParametersTypeA{#2}}%
        {TypeB}{\DefineMyFormatLinkParametersTypeB{#2}}%
    }[\typeout{*** ERROR: Unknown link type: #1}]%
}%


\begin{document}
% ------------------------------- First version: works fine.
\DefineMyFormatLinkParameters{%
    *[Main Search Site]{Google}{http://www.google.com},
    {people.brunel.ac.uk}{http://people.brunel.ac.uk/\string~mastmmg/ssguide/set\string_work.html\string#4\string_32},
    {Yahoo}{http://www.yahoo.com}
}

\foreach \x in \MyFormatLinkParameters {%
    \typeout{DEBUG: "\x"}
    \expandafter\FormatLinks\x
}%


%------------------------------- Second version: Not working if uncomment 
%                                people.burnel.ac.uk.  Only difference
%                                is that it has one extra level of macro
%                                processing which causes some problem!
\DefineMyFormatLinkParametersNew[TypeB]{%
    *[Main Search Site]{Google}{http://www.google.com},
    %{people.brunel.ac.uk}{http://people.brunel.ac.uk/\string~mastmmg/ssguide/set\string_work.html\string#4\string_32},
    {Yahoo}{http://www.yahoo.com}
}

\bigskip\Title:% 
\foreach \x in \MyFormatLinkParametersNew {%
    \typeout{DEBUG: "\x"}
    \expandafter\FormatLinks\x
}

\end{document}

Respuesta1

No estoy seguro de usar xstring si ya tienes l3 y pgf cargados, pero de todos modos:

\documentclass{article}
\usepackage{url}
\usepackage{pgffor}
\usepackage{xparse}
\usepackage{xstring}
\usepackage[colorlinks=true]{hyperref}

\NewDocumentCommand{\FormatLinks}{%
    s%   #1 =* not used yet
    O{}% #2 = optional title
    m%   #3 = Mandatory title
    m%   #4 = URL Link
}{%
    \par
    \hspace*{1.0cm}\href{#4}{#3\IfValueT{#2}{~(#2)}}%
}%

\newcommand*{\MyFormatLinkParameters}{}% Initialize
\newcommand*{\DefineMyFormatLinkParameters}[1]{%
    \edef\MyFormatLinkParameters{#1}%
}%


%% \DefineMyFormatLinkParametersNew (compared to \DefineMyFormatLinkParameters) has 
%% one extra level of macro processing based on the optional #1 parameter
\newcommand*{\Title}{}%
\newcommand*{\DefineMyFormatLinkParametersTypeA}[1]{%
    \edef\MyFormatLinkParametersNew{#1}%
    \def\Title{Type A Links}%
}%
\newcommand*{\DefineMyFormatLinkParametersTypeB}[1]{%
    \edef\MyFormatLinkParametersNew{#1}%
    \def\Title{Type B Links}%
}%
\newcommand*{\DefineMyFormatLinkParametersNew}[2][TypeB]{%
    %\edef\MyFormatLinkParametersNew{#2}% Don't assign it here directly, 
                                        % but pass it along 
\edef\tempz{\unexpanded{#2}}%
    \IfStrEqCase{#1}{%
        {TypeA}{\DefineMyFormatLinkParametersTypeA{\tempz}}%
        {TypeB}{\DefineMyFormatLinkParametersTypeB{\tempz}}%
    }[\typeout{*** ERROR: Unknown link type: #1}]%
}%


\begin{document}
% ------------------------------- First version: works fine.
\DefineMyFormatLinkParameters{%
    *[Main Search Site]{Google}{http://www.google.com},
    {people.brunel.ac.uk}{http://people.brunel.ac.uk/\string~mastmmg/ssguide/set\string_work.html\string#4\string_32},
    {Yahoo}{http://www.yahoo.com}
}

\foreach \x in \MyFormatLinkParameters {%
    \typeout{DEBUG: "\x"}
    \expandafter\FormatLinks\x
}%


%------------------------------- Second version: Not working if uncomment 
%                                people.burnel.ac.uk.  Only difference
%                                is that it has one extra level of macro
%                                processing which causes some problem!
\DefineMyFormatLinkParametersNew[TypeB]{%
    *[Main Search Site]{Google}{http://www.google.com},
    {people.brunel.ac.uk}{http://people.brunel.ac.uk/\string~mastmmg/ssguide/set\string_work.html\string#4\string_32},
    {Yahoo}{http://www.yahoo.com}
}

\bigskip\Title:% 
\foreach \x in \MyFormatLinkParametersNew {%
    \typeout{DEBUG: "\x"}
    \expandafter\FormatLinks\x
}

\end{document}

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