Passing commas to key-value pairs with l3keys

Question

How can I pass commas to key-value pairs when using l3keys ? Have inserted double quotes but the quotes get printed as well, something I do not want to appear.

\documentclass[a4paper,12pt]{article}
\ExplSyntaxOn
\keys_define:nn { adr_keys }
  {
    name .tl_set:N = \l_name_tl,
    vltw .tl_set:N = \l_vltw_tl,
  }
\cs_new_protected:Nn \print_adr:n
  {
    \keys_set:nn { adr_keys } { #1 }
\begin {tabular} { @{} l@{} }

  \tl_use:N \l_name_tl \\

  \tl_if_blank:VF \l_vltw_tl
    { \tl_use:N \l_vltw_tl \\ }

\end {tabular}

}
\NewDocumentCommand {\adr} { m }
  {
    \begin {flushright}
      \print_adr:n { #1 }
    \end {flushright}
  }
\ExplSyntaxOn
\begin{document}
\adr
  {
    name="Heime Borgia",
    vltw="405 Hilgard Ave, Los Angeles",
  }
\end{document}

Nothing to do with expl3: what made you think that quote marks would have any special meaning to TeX? — Joseph Wright, Mar 10 '24 at 22:46
You probably need braces around values which themselves contain a comma. — User23456234, Mar 10 '24 at 22:53

score 3 · Accepted Answer · answered Mar 10 '24 at 22:54

TeX's parsing rules mean that the way to 'hide' a token inside such delimited contexts is to use a {...} pair (assuming normal catcodes). This is unaffected by expl3.

\adr
  {
    name= Heime Borgia,
    vltw= {405 Hilgard Ave, Los Angeles},
  }

(It would be possible to have token-by-token parsing and pick up the " characters in a keyval context, but that would be slow and not needed here: we are dealing with input where expecting {...} treatment is reasonable.)

Passing commas to key-value pairs with l3keys

1 Answers1