Function defineFunction

static/katex/katex.mjs:6163–6202

(_ref)

const _mathmlGroupBuilders = {};
function defineFunction(_ref) {
  let type = _ref.type,
      nodeType = _ref.nodeType,
      names = _ref.names,
      props = _ref.props,
      handler = _ref.handler,
      htmlBuilder = _ref.htmlBuilder,
      mathmlBuilder = _ref.mathmlBuilder;
  // Set default values of functions
  const data = {
    type,
    numArgs: props.numArgs,
    argTypes: props.argTypes,
    greediness: props.greediness === undefined ? 1 : props.greediness,
    allowedInText: !!props.allowedInText,
    allowedInMath: props.allowedInMath === undefined ? true : props.allowedInMath,
    numOptionalArgs: props.numOptionalArgs || 0,
    infix: !!props.infix,
    consumeMode: props.consumeMode,
    handler: handler
  };

  for (let i = 0; i < names.length; ++i) {
    // TODO: The value type of _functions should be a type union of all
    // possible `FunctionSpec<>` possibilities instead of `FunctionSpec<*>`,
    // which is an existential type.
    // $FlowFixMe
    _functions[names[i]] = data;
  }

  if (type) {
    if (htmlBuilder) {
      _htmlGroupBuilders[type] = htmlBuilder;
    }

    if (mathmlBuilder) {
      _mathmlGroupBuilders[type] = mathmlBuilder;
    }
  }
}
/**
 * Use this to register only the HTML and MathML builders for a function (e.g.
 * if the function's ParseNode is generated in Parser.js rather than via a