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\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[american]{babel}
\usepackage{csquotes}
\usepackage{verbatim}
\usepackage[style=authortitle,backend=biber]{biblatex}
\addbibresource{biblatex-examples.bib}
\setlength{\parindent}{0pt}
\newcommand{\cmd}[1]{\texttt{\textbackslash #1}}
\DeclareDelimFormat[bib]{space}{X}
\DeclareDelimFormat[test]{space}{Y}
\DeclareDelimFormat{testb}{B}
\DeclareDelimFormat[testbcontext]{testb}{C}
\DeclareDelimFormat{testc}{D}
\DeclareDelimFormat[testccontext]{testc}{E}
\makeatletter
% Some of these tests generate definition warnins which we don't want in tests
\def\blx@warn@delimdeclare#1#2{\relax}
\makeatother
\begin{document}
\section*{Context-Sensitive Delimiters}
Normal cite uses global delim definition with comma:\\\\
\cite{averroes/hannes}\\\\
Textual cite uses "textcite" context without comma:\\\\
\textcite{averroes/hannes}\\\\
Reset of global delimiter with traditional method:\\\\
\renewcommand*{\nametitledelim}{\addcomma\space}
\cite{averroes/hannes}\\\\
Textual cite in "textcite" context is not reset:\\\\
\textcite{averroes/hannes}\\\\
\begingroup
\def\addcomma{,}
\let\space\textvisiblespace
Invoke default delimiter in context-sensitive interface:\\
\printdelim{nametitledelim}\\\\
Invoke global delimiter via normal macro:\\
\nametitledelim\\\\
Invoke delimiter in context-sensitive interface with explicit context:\\\\
\printdelim[textcite]{nametitledelim}\\\\
\endgroup
Default delimiter "testb":\\\\
\printdelim{testb}\\\\
Setting "testbcontext" with \cmd{delimcontext}:\\\\
\delimcontext{testbcontext}\printdelim{testb}\\\\
Redefine "testb" delim with starred version to remove all contexts:\\\\
\DeclareDelimFormat*{testb}{B}
\printdelim{testb}\\\\
Check nesting\\\\
\begingroup
\delimcontext{testccontext}\printdelim{testc}\\\\
\endgroup
\printdelim{testc}\\\\
\printbibliography
Reset the \cmd{space} command for this bibliography to use the
context-sensitive interface. First we use the default "bib" context:
\AtNextBibliography{\renewcommand*{\space}{\printdelim{space}}}
\printbibliography
Now use a custom context "test" and \cmd{space} expands to something
different. Also, "nametitledelim" is back to default because we override
the default "bib" context:
\AtNextBibliography{\renewcommand*{\space}{\printdelim{space}}\delimcontext{test}}
\printbibliography
\end{document}
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