Function startsWithConstant

src/expression/node/OperatorNode.js:23–33

* Returns true if the expression starts with a constant, under * the current parenthesization: * @param {Node} expression * @param {string} parenthesis * @return {boolean}

(expr, parenthesis)

   * @return {boolean}
   */
  function startsWithConstant (expr, parenthesis) {
    let curNode = expr
    if (parenthesis === 'auto') {
      while (isParenthesisNode(curNode)) curNode = curNode.content
    }
    if (isConstantNode(curNode)) return true
    if (isOperatorNode(curNode)) {
      return startsWithConstant(curNode.args[0], parenthesis)
    }
    return false
  }

  /**
   * Calculate which parentheses are necessary. Gets an OperatorNode