@danielsimonjr/mathts-expression

Expression parser & evaluator for MathTS.

The expression engine for MathTS: a parser (string → AST), an AST node set, a compiler, and an evaluator. Includes a sandbox (getSafeProperty / getSafeMethod) for safe property access.

Install

npm install @danielsimonjr/mathts-expression

What it provides

• createParse / createParserClass / createParser — parse to an AST.
• 16 AST node constructors (createConstantNode, createOperatorNode, …).
• compile / createEvaluate / compileExpression — evaluate expressions.
• AST serializers on every node: toString(), toTex() (LaTeX), toHTML(), and toMathML() (MathML).
• Focused re-exports are also published: @danielsimonjr/mathts-{parser,ast,evaluator}.

Serializing an AST

Every node serializes to several formats. toMathML() returns a MathML fragment (like toTex() returns a LaTeX fragment, without delimiters); wrap it in a <math> element with mathMLDocument(node) to render. MathML is typeset natively by modern browsers — no external dependencies.

import { mathMLDocument, mathMLError } from '@danielsimonjr/mathts-expression';

const node = parse('c = 1 / sqrt(eps0 * mu0)'); // parse from the functions package
node.toString();       // 'c = 1 / sqrt(eps0 * mu0)'
node.toTex();          // 'c=\\frac{1}{\\sqrt{ eps0\\cdot mu0}}'
node.toMathML();       // '<mrow><mi>c</mi><mo>=</mo><mfrac>…</mfrac></mrow>'
mathMLDocument(node);  // '<math xmlns="…" display="block">…</math>'  (renderable)

mathMLError(src) produces a <math><merror> element for a parse failure.

License

MIT (c) Daniel Simon Jr.