Bug Tracker

ID	303🔗
Date:	2025-04-25 12:50:16
Last update:	2025-04-25 14:13:20
Status	Closed (Fixed)
Category	datatool
Version	3.4
Summary	Use of arguments inconsistent with expl3 language specification

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Description

I am writing as a developer of expltools [Link], which includes the static analysis tool explcheck for the expl3 programming language.

In February, we launched a public website [Link] that aggregates all issues detected in the current TeX Live distribution by explcheck. According to our report, datatool currently triggers 1 error "E300 (Unexpected function call argument)" [Link] in the following invocation on line 2603 of file databib.sty:

  \regex_extract_once:NnNF \c_databib_year_suffix_regex
     \l__datatool_tmp_seq
   {
     \seq_get_left:NN
       \l__datatool_tmp_seq
       \l__databib_year_tl
   }
   {
     \tl_clear:N \l__databib_year_tl
   }

Specifically, the issue is with the N-type argument { \seq_get_left:NN [...] }, because an N-type argument should consist of exactly one (unbraced) token, yet it consists of a braced set of three tokens.

It's not entirely clear to me what is being accomplished but the documentation of \regex_extract_once:NnNF in interface3.pdf says the arguments should be as follows: ⟨regex⟩ {⟨token list⟩} ⟨seq var⟩ {⟨false code⟩} Given that \l__datatool_tmp_seq appears as the second argument, I wonder if perhaps the second and third arguments have been exchanged by a mistake here?

MWE

Download (15B)

not applicable

Evaluation

It should be

\cs_new:Nn \__databib_get_year_suffix:n
{        
  \regex_extract_once:NnNTF \c_databib_year_suffix_regex
     { #1 }
     \l__datatool_tmp_seq
   {   
     \seq_get_left:NN
       \l__datatool_tmp_seq
       \l__databib_year_tl
   }
   {
     \tl_clear:N \l__databib_year_tl
   }
}

I'll get it fixed. Thank you.

Update: fixed in v3.4.1

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