ifptex Package Bundle

TeX: To check the engine is pTeX (or its derivatives)

The ifptex package is a counterpart of ifxetex, ifluatex, etc. for the pTeX engine. The ifuptex package is an alises to ifptex provided for backward compatibility.

System Requirements

• TeX format: plain TeX, LaTeX, and INI mode.
  • TeX engine: Anything.
  • DVI driver (in DVI mode): Anything.
  • Dependent packages:
    • iftex

Installation

In a system compliant to TDS 1.1, move the files as follows:

• *.sty → $TEXMF/tex/generic/ifptex

And rehash your TEXMF trees if necessary.

License

This package is distributed under the MIT License.

ifptex Package ― Test for pTeX engine

Package Loading

In plain TeX:

\input ifptex.sty

In LaTeX:

\usepackage{ifptex}

Usage

NB: Here “ε-TeX-ness” is not considered.

• \ifptex (or \ifpTeX) if-token Whether the engine is pTeX (including upTeX or pTeX-ng).
  • \ifstrictptex (or \ifstrictpTeX) if-token Whether the engine is pTeX but not upTeX or pTeX-ng.
  • \ifuptex (or \ifupTeX) if-token Whether the engine is upTeX (including pTeX-ng).
  • \ifstrictuptex (or \ifstrictupTeX) if-token Whether the engine is upTeX but not pTeX-ng.
  • \ifnativeuptex (or \ifnativeupTeX) if-token Whether the engine is upTeX and its internal encoding is Unicode.
  • \ifptexng (or \ifpTeXng) if-token Whether the engine is pTeX-ng.
  • \RequirepTeX Issues an error if \ifptex fails.
  • \RequireStrictpTeX Issues an error if \ifstrictptex fails.
  • \RequireupTeX Issues an error if \ifuptex fails.
  • \RequireStrictupTeX Issues an error if \ifstrictuptex fails.
  • \RequireNativeupTeX Issues an error if \ifnativeuptex fails.
  • \RequirepTeXng Issues an error if \ifptexng fails.
  • \upTeXguessedversion mathchardef-token The guessed value of upTeX version; given as a 100-folded integer. NB. On version 1.23 or later, the value is correct. NB. On a non-upTeX engine, the value is zero.
  • \RequireupTeXAtLeast{<required>} Issues an error if \upTeXguessedversion is smaller than the given required value.
  • \RequireNativeupTeXAtLeast{<required>} Issues an error either if \upTeXguessedversion is smaller than the given required value or if \ifnativeuptex fails.

The following functions are for testing whether pLaTeX and/or upLaTeX (in their prevailing meaning) is used. There upLaTeX is not regarded as a kind of pLaTeX.

• \ifstrictplatex if-token Whether pLaTeX is used.
  • \ifstrictuplatex if-token Whether upLaTeX is used.
  • \ifporuplatex if-token Whether pLaTeX or upLaTeX is used.
  • \RequireStrictpLaTeX Issues an error if \ifstrictplatex fails.
  • \RequireStrictupLaTeX Issues an error if \ifstrictuplatex fails.
  • \RequirepOrupLaTeX Issues an error if \ifporuplatex fails.
  • \RequireStrictupLaTeXAtLeast{<required>} Issues an error either if \upTeXguessedversion is smaller than the given required value or if \ifstrictuplatex fails.

ifuptex Package ― Alias of ifptex

The ifuptex package does nothing but loading ifptex internally. It is provided for backward compatibility.

Package Loading

In plain TeX:

\input ifuptex.sty

In LaTeX:

\usepackage{ifuptex}

Usage

Just the same as the ifptex package.

Revision History

• Version 2.2c 〈2023/04/08〉
  • Add \RequireStrictupLaTeXAtLeast.
  • Version 2.2b 〈2023/02/25〉
    • Add \ifporuplatex and \RequirepOrupLaTeX.
  • Version 2.2a 〈2023/02/23〉
    • Add \ifstrictplatex and \ifstrictupltex, along with their Require... counterparts.
  • Version 2.2 〈2022/04/03〉
    • Officialy support \upTeXguessedversion.
      • Add \Require(Native)upTeXAtLeast.
  • Version 2.1 〈2021/07/01〉
    • Adjust for the future version of pTeX.
      • Drop an undocumented feature.
  • Version 2.0 〈2019/11/01〉
    • Adjust to work better with the new iftex package maintanined by the LaTeX3 Project.
      • Now iftex is loaded inside ifptex.
        • Provide always all-lowercase \if...tex commands.
      • Support for loading in INI mode.
  • Version 1.2c 〈2017/10/04〉
  • Version 1.2b 〈2017/09/20〉
  • Version 1.2a 〈2017/09/15〉
  • Version 1.2 〈2017/09/09〉
    • Add \ifstrictupTeX and RequireStrictupTeX.
  • Version 1.1 〈2017/05/04〉
    • Minor fix.
  • Version 1.0 〈2013/04/29〉
    • Move to a separate bundle.
      • Change the package name to ifptex, and added the test for pTeX (besides upTeX).
  • Version 0.2 〈2008/03/14〉
    • First public version.

Takayuki YATO (aka. "ZR") https://github.com/zr-tex8r