Function mathjsLang

examples/code_editor/mathjs-lang.js:8–238

(math)

 * @param {Object} math A mathjs instance
 */
export function mathjsLang(math) {
  function wordRegexp(words) {
    return new RegExp('^((' + words.join(')|(') + '))\\b')
  }

  const singleOperators = new RegExp("^[-+*/&|^~<>!%']")
  const singleDelimiters = new RegExp('^[([{},:=;.?]')
  const doubleOperators = new RegExp('^((==)|(!=)|(<=)|(>=)|(<<)|(>>)|(\\.[-+*/^]))')
  const doubleDelimiters = new RegExp('^((!=)|(^\\|))')
  const tripleDelimiters = new RegExp('^((>>>)|(<<<))')
  const expressionEnd = new RegExp('^[\\])]')
  const identifiers = new RegExp('^[_A-Za-z\xa1-\uffff][_A-Za-z0-9\xa1-\uffff]*')

  const mathFunctions = []
  const mathPhysicalConstants = []
  const mathIgnore = ['expr', 'type']
  const numberLiterals = [
    'e',
    'E',
    'i',
    'Infinity',
    'LN2',
    'LN10',
    'LOG2E',
    'LOG10E',
    'NaN',
    'null',
    'phi',
    'pi',
    'PI',
    'SQRT1_2',
    'SQRT2',
    'tau',
    'undefined',
    'version'
  ]

  // based on https://github.com/josdejong/mathjs/blob/develop/bin/cli.js
  for (const expr in math.expression.mathWithTransform) {
    if (!mathIgnore.includes(expr)) {
      if (typeof math[expr] === 'function') {
        mathFunctions.push(expr)
      } else if (!numberLiterals.includes(expr)) {
        mathPhysicalConstants.push(expr)
      }
    }
  }

  // generates a list of all valid units in mathjs
  const listOfUnits = []
  for (const unit in math.Unit.UNITS) {
    for (const prefix in math.Unit.UNITS[unit].prefixes) {
      listOfUnits.push(prefix + unit)
    }
  }

  const builtins = wordRegexp(mathFunctions)