Bookmarking uppercase Roman numbers

Question

Have the MWE:

\documentclass{article}
\usepackage[backref=page,hypertexnames]{hyperref}
\newcommand{\RNum}[1]{\uppercase\expandafter{\romannumeral #1\relax}}

\begin{document}
    \section{Sec. \RNum{1}}
    \section{Sec. \RNum{2}}
\end{document}

The bookmark in the PDF shows that the numbers are indeed small case (while it should be upper case). How to get it fixed?

Is there any reason you provide the section numbers manually? Is it just for the MWE (if so, that is perfectly valid of course)? — Marijn, Jul 31 '18 at 10:06
@Marijn Actually, in my case, section names are, Type I, Type II etc. So, I have to write Roman numerals in section name. — hola, Jul 31 '18 at 11:26
I guess you'd need an expandable \uppercase, but \uupercase is not expandable, see https://tex.stackexchange.com/q/387816/35864. See also https://tex.stackexchange.com/q/10805/35864 — moewe, Jul 31 '18 at 12:05
`\documentclass{article} \usepackage{xparse} \usepackage{hyperref}
\ExplSyntaxOn \DeclareExpandableDocumentCommand{\RNum}{m}{\int_to_Roman:n{#1}} \ExplSyntaxOff

\begin{document} \section{Sec.\ \RNum{1}} \section{Sec.\ \RNum{2}} \end{document}` seems to work. — moewe, Jul 31 '18 at 12:10
Or from https://tex.stackexchange.com/a/23492/35864 without LaTeX3 `\documentclass{article} \usepackage{hyperref}
\makeatletter \newcommand*{\RNum}[1]{\expandafter@slowromancap\romannumeral #1@} \makeatother

\begin{document} \section{Sec.\ \RNum{1}} \section{Sec.\ \RNum{2}} \end{document}` — moewe, Jul 31 '18 at 12:15

moewe · Accepted Answer · 2020-12-16T03:45:17.190

You need an expandable version of \RNum so that it appears correctly in the bookmarks. But \uppercase is not expandable (see \expandafter with \uppercase), so you will need the slightly different definition from the LaTeX kernel (see also How can I get Roman numerals in text?, thank you to Marcel Krüger for pointing out that the initial answer had just a verbatim copy of \RNum)

\documentclass{article}
\usepackage{hyperref}
\makeatletter
\newcommand*{\RNum}{} % empty def to throw error if name already taken
\let\RNum@Roman      % actual definition
\makeatother
\begin{document}
    \section{Sec.\ \RNum{1}}
    \section{Sec.\ \RNum{2}}
\end{document}

Bookmarking uppercase Roman numbers

1 Answers1