CTAN Comprehensive TeX Archive Network

Directory macros/latex/contrib/l3packages

README.md

3 High-Level Concepts

Release 2019-05-28

Overview

The l3packages collection is contains implementations for aspects of the 3 kernel, dealing with higher-level ideas such as the Designer Interface. The packages here are considered broadly stable (The 3 Project does not expect the interfaces to alter radically). These packages are build on conventions at the interface level, and so may not migrate in the current form to a stand-alone 3 format.

All of the material in the collection requires the 3 base layer package l3kernel. The two packages must be installed in matching versions: if you update l3packages, make sure that l3kernel is updated at the same time.

Currently included in the CTAN release of l3packages are the following bundles:

  • l3keys2e
  • xfp
  • xfrac
  • xparse
  • xtemplate

l3keys2e


The l3keys2e package allows keys defined using l3keys to be used as package and class options with . This is tied to the method the existing kernel uses for processing options, and so it is likely that a stand-alone 3 kernel will use a very different approach.

xfp


The xfp package provides a document-level interface for the 3 FPU. As such, it is a wrapper around the core \fp_eval:n function but does not require code syntax. It provides the expandable command \fpeval, which can be used inside for example \edef or contexts where requires a number.

xfrac


The xfrac package uses the interface defined by xtemplate to provide flexible split-level fractions via the \sfrac macro. This is both a demonstration of the power of the template concept and also a useful addition to the available functionality in .

xparse


The xparse package provides a high-level interface for declaring document commands, e.g., a uniform way to define commands taking optional arguments, optional stars (and others), mandatory arguments and more.

xtemplate


The xtemplate package provides an interface for defining generic functions using a key=val syntax. This is designed to be "self-documenting", with the key definitions providing information on how they are to be used.

Discussion

Discussion concerning the approach, suggestions for improvements, changes, additions, etc. should be addressed to the list -L.

You can subscribe to this list by sending mail to

listserv@urz.uni-heidelberg.de

with the body containing

subscribe LATEX-L  <Your-First-Name> <Your-Second-Name>

Issues

The issue tracker for 3 is currently located on GitHub.

Please report specific issues with 3 code there; more general discussion should be directed to the -L list.

The 3 Project

Development of 3 is carried out by The 3 Project. Currently, the team members are

  • Johannes Braams
  • David Carlisle
  • Robin Fairbairns
  • Morten Høgholm
  • Bruno Le Floch
  • Thomas Lotze
  • Frank Mittelbach
  • Will Robertson
  • Chris Rowley
  • Rainer Schöpf
  • Joseph Wright

Former members of The 3 Project team were

  • Michael Downes
  • Denys Duchier
  • Alan Jeffrey
  • Martin Schröder

The development team can be contacted by e-mail: <latex-team@latex-project.org>; for general 3 discussion the -L list should be used.


Copyright (C) 1998-2011,2015-2019 The LaTeX3 Project
http://latex-project.org/
All rights reserved.

Download the contents of this package in one zip archive (2.0M).

l3packages – High-level 3 concepts

This collection contains implementations for aspects of the 3 kernel, dealing with higher-level ideas such as the Designer Interface. The packages here are considered broadly stable (The 3 Project does not expect the interfaces to alter radically). These packages are built on conventions at the interface level, and so may not migrate in the current form to a stand-alone 3 format.

Packages provided:

  • xparse, which provides a high-level interface for declaring document commands
  • xfp, an expandable IEEE 754 FPU for
  • l3keys2e, which makes the facilities of the kernel module l3keys available for use by 2e packages
  • xtemplate, which provides a means of defining generic functions using a key-value syntax
  • xfrac, which provides flexible split-level fractions

Packagel3packages
Home pagehttp://www.latex-project.org/code.html
Version 2019-05-28
LicensesThe Project Public License 1.3c
Copyright1998–2011, 2015–2019 The project
MaintainerThe Team
TDS archivel3packages.tds.zip
Contained inTeX Live as l3packages
MiKTeX as l3packages
TopicsMacro support
Pre release
3
See alsol3experimental
l3kernel
...
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