const { create, all } = require('mathjs')

const math = create(all, {
  number: 'BigNumber',      // Default type of number:
  precision: 15             // Number of significant digits for BigNumbers
})

let expr = 'log(e,9)' // Rule ignores second argument
console.log(math.evaluate(expr).toString()) // 0.455119613313419
console.log(math.simplify(expr).toString()) // 1

let rules = math.simplify.rules
rules.splice(1,1) // Remove rule `{ l: 'log(e)', r: '1' }`
console.log(math.evaluate(expr).toString()) // 0.455119613313419
console.log(math.simplify(expr, rules).toString()) // log(e, 9)

if ((node.args.length === 1 && rule.args.length === 1) || !isAssociative(node) || isSplit) {
  // Expect non-associative operators to match exactly
  const childMatches = []
  for (let i = 0; i < rule.args.length; i++) {
    const childMatch = _ruleMatch(rule.args[i], node.args[i])
    if (childMatch.length === 0) {
      // Child did not match, so stop searching immediately
      return []
    }
    // The child matched, so add the information returned from the child to our result
    childMatches.push(childMatch)
  }
  res = mergeChildMatches(childMatches)
}

if ((node.args.length === 1 && rule.args.length === 1) || (!isAssociative(node) && node.args.length == rule.args.length) || isSplit)