WebAssembly in LuaLaTeX (SotonHack 2026 project)
initial commit
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wasmtex.sty
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wasmtex.sty
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\ProvidesPackage{wasmtex}[2026-03-15 v0.1a WebAssembly for LuaLaTeX]
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\directlua{wasmlib = require("wasmlib")}
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\NewDocumentCommand\WASMTracingOn{}{\directlua{wasmlib.TRACING = true}}
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\NewDocumentCommand\WASMInstantiateFile{v m}{
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\directlua{
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__wasmtex_#2 = wasmlib.VM:new()
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__wasmtex_#2.outBuf = ""
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__wasmtex_#2:instantiateFile(
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"\luaescapestring{#1}",
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{
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tex = {
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tex_putchar = function(x)
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__wasmtex_#2.outBuf = __wasmtex_#2.outBuf .. string.char(x)
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end,
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tex_flush = function()
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tex.sprint(__wasmtex_#2.outBuf)
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__wasmtex_#2.outBuf = ""
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end,
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},
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env = {
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putchar = function(x) io.write(string.char(x)) end,
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putint = function(x) print("DEBUG",x) end,
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},
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}
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)
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}
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}
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\NewDocumentCommand\WASMCallExportedFunction{m v v}{
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\directlua{
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__wasmtex_#1.exports.#2(#3)
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}
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}
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\NewDocumentCommand\WASMCallFunctionByIndex{m m}{
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\directlua{
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__wasmtex_#1:invoke(#2)
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while \string##__wasmtex_#1.stackFrames > 0 do __wasmtex_#1:step() end
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}
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}