web2js

This is a Pascal compiler that targets WebAssembly, designed specifically to compile TeX.

Importantly, this version passes the trip tests which you can verify by running make test.

Prerequisites

This projects depends on NodeJS for executing the javascript. To post-process the WebAssembly, you will need wasm-opt on your path.

You will need a full TeX installation (e.g., TeX Live) with access to kpsewhich in order that library.js can find the necessary TeX files. You also need tie and tangle to turn the WEB sources into Pascal which can be fed to the compiler.

The contents of the texk, triptrap, and etexdir subdirectories were simply copied from tug.org via

mkdir texk
rsync -a --delete --exclude=.svn tug.org::tldevsrc/Build/source/texk/web2c/tex.web texk
rsync -a --delete --exclude=.svn tug.org::tldevsrc/Build/source/texk/web2c/triptrap .
rsync -a --delete --exclude=.svn tug.org::tldevsrc/Build/source/texk/web2c/etexdir .

Getting started

After cloning this repository, be sure to run npm install.

The following assumes you have TeX running on your machine (e.g., that tangle is available).

tie -c changes.ch tex.web etex.ch tex.ch

tie -c changes.ch tex.web etex.ch date.ch ord-chr.ch ximera.ch tex.ch tangle -underline tex.web changes.ch node compile.js tex.p wasm-opt --asyncify --pass-arg=asyncify-ignore-indirect -O out.wasm -o async.wasm mv async.wasm out.wasm node initex.js

need to use an INTEGER code for pdftexversion!!!! @d eTeX_version_code=eTeX_int {code for .{\eTeXversion}}

Produce the Pascal source by tangling.

tangle -underline tex.web changes.ch

You will now have the Pascal source tex.p along with tex.pool which contains the strings.

Compile the tex.p sources to get the the WebAssembly binary out.wasm

npm install
npm run-script build
node compile.js tex.p

You may want to run

wasm-opt --asyncify --pass-arg=asyncify-ignore-indirect -O out.wasm -o async.wasm
mv async.wasm out.wasm

to get a version compatible with [https://github.com/GoogleChromeLabs/asyncify].

Produce plain.fmt and a corresponding memory dump.

node initex.js

Now compile sample.tex by running

node tex.js