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I don't understand how \IfStrEq from xstring works.

Why this code doesn't show "This is text" ?

\documentclass[10pt,a4paper,twoside]{article}
\usepackage{xparse}
\usepackage{xstring}
    
\DeclareDocumentCommand \field {} {text}
    
\begin{document}
  \IfStrEq{\field}{text}{This is text}{Why this is not text?}
\end{document}
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  • But the manual says "The command \fullexpandarg is called by default, so all the arguments are fully expanded"
    – Samuel Déom
    Mar 15, 2021 at 11:29
  • 1
    But \field is defined with \DeclareDocumentCommand and so is very non-expandable. Try with \newcommand\field{text}.
    – Ulrike Fischer
    Mar 15, 2021 at 11:35
  • without xparse you are seeing the effect of \protected\def\field{text} and text
    – David Carlisle
    Mar 15, 2021 at 11:39
  • ok, this is because \field is protected (normal behavior of \DeclareDocumentCommand) using \def solves the problem. Thank you very much David and Ulrike
    – Samuel Déom
    Mar 15, 2021 at 11:47
  • \field is not a string, but something eventually printing text. Using \IfStrEq is wrong.
    – egreg
    Mar 15, 2021 at 13:19

1 Answer 1

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This is because \field is protected (normal behavior of \DeclareDocumentCommand). Using \def solves the problem.

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