Maths written any way, into anything.

A script tag

One file from a CDN, no build. Everything is on window.MathZetta.

<script src="https://cdn.jsdelivr.net/npm/mathzetta@1/build/mathzetta.min.js"></script>
<script>
  const { parse, toLaTeX, toSpeech } = MathZetta;
  toSpeech('(x+1)^2');   // "the quantity x plus 1, squared"
</script>

Modules: only what you use

The core is the parser; each output is its own entry point, so a page that only needs LaTeX only loads LaTeX.

import { parse } from 'mathzetta';
import { toLaTeX } from 'mathzetta/latex';
import { calculate } from 'mathzetta/calculate';

parse('2x sin x');            // ['2','x','*','x','sin','*']
toLaTeX('x^2/2');             // '\\frac{x^2}{2}'
calculate('sqrt(8)').text;    // '2*sqrt(2)'

Entries: /latex /mathml /text /speech /javascript /python /sql /excel /glsl /evaluate /calculate /formulas /all /plain — all of them, live. From a CDN without npm: import https://cdn.jsdelivr.net/npm/mathzetta@1/build/mathzetta.esm.min.js, or pick exactly the outputs you need on the CDN page (one small file per output, the core shared).

Node

npm install mathzetta
node -e "import('mathzetta/sql').then(m =>
  console.log(m.toSQL('price * qty > 10')))"
// or require('mathzetta') for the CommonJS build

Answers inside text: {{…}}

Anything in double braces is calculated — exactly where it can be — before the rest is parsed. Load mathzetta/calculate (or the script tag) and it's on.

toText('3 + 4 = {{3 + 4}}')            // '3 + 4 = 7'
toLaTeX('\\sqrt{8} = {{sqrt(8)}}')    // '\\sqrt{8} = 2\\sqrt{2}'
toText('\\pi \\approx {{~4 pi}}')     // 'π ≈ 3.1416'

Show it: Inline Math

A sibling library draws the same trees as HTML and CSS — fractions, integrals, piecewise — with every part addressable by the same node ids the spoken form uses, so a narration can light up what it's describing.

import { render } from '@mathzetta/inlinemath';
const v = render(el, String.raw`\int_0^1 x^2 dx`);
v.highlight('x^2');  v.set(String.raw`\frac{1}{3}`, { animate: true });

Open the Inline Math demo

Formulas over tables

mathzetta/formulas turns H / AB > 0.3 into a function of a row, or a SQL expression. tabview is a whole table page built on it — rows in the browser, in a tabc server, or in a sqldn (SQLite) server.

const f = strToFunction(['H', 'AB'], 'H / AB');
createRowEvaluator(f.jsFunction)([30, 100]);  // 0.3
strToSQL(['H', 'AB'], 'H / AB > 0.3', new Map(),
  { dialect: 'sqlite' }).sqlExpression;

Open the tabview demo

Image filters

mathzetta/glsl writes shaders; qblur turns a formula like if gray > 0.5 then (1, 0, 0) or gaussian(3) into a shareable filter with parameters, masks and chains, and runs it in WebGL.

Open the filter editor

Algebra: MathZetta CAS

Exact simplify, factor, solve, differentiate and integrate, with steps you can read. What it knows is rules over the same postfix, which you can read and change. npm install @mathzetta/cas

import { parse } from 'mathzetta';
import { createCAS } from '@mathzetta/cas';
const cas = createCAS({ read: (text) => parse(text) });

cas.diff('x^2 sin(x)', 'x').text         // x^2·cos(x) + 2x·sin(x)
cas.solve('x^2 - 5x + 6 = 0', 'x').text  // x = 2 or x = 3
cas.integrate('x e^x', 'x').text         // x·e^x - e^x

Try it on Inline Math's CAS page · the rules behind it

Narrated videos

MathZetta CAS takes one step at a time, Inline Math draws each line, the speech segments tie every spoken word to the part of the board it describes, and a TTS server speaks it. The derivative of x^2 sin(x) as a video, from one line of input.

Open the video maker (needs its server)

Rules as formulas

Two games use MathZetta so every rule — swing chance, fatigue, ticket demand — is a formula the player can replace and see rendered. If your app has knobs, they can be formulas.

evaluate('max(0, 1 - fatigue/100) * skill',
         { fatigue: 50, skill: 0.8 });   // 0.4