Class OperatorNode

src/expression/node/OperatorNode.js:242–702

  }

  class OperatorNode extends Node {
    /**
     * @constructor OperatorNode
     * @extends {Node}
     * An operator with two arguments, like 2+3
     *
     * @param {string} op           Operator name, for example '+'
     * @param {string} fn           Function name, for example 'add'
     * @param {Node[]} args         Operator arguments
     * @param {boolean} [implicit]  Is this an implicit multiplication?
     * @param {boolean} [isPercentage] Is this an percentage Operation?
     */
    constructor (op, fn, args, implicit, isPercentage) {
      super()
      // validate input
      if (typeof op !== 'string') {
        throw new TypeError('string expected for parameter "op"')
      }
      if (typeof fn !== 'string') {
        throw new TypeError('string expected for parameter "fn"')
      }
      if (!Array.isArray(args) || !args.every(isNode)) {
        throw new TypeError(
          'Array containing Nodes expected for parameter "args"')
      }

      this.implicit = (implicit === true)
      this.isPercentage = (isPercentage === true)
      this.op = op
      this.fn = fn
      this.args = args || []
    }

    static name = name
    get type () { return name }
    get isOperatorNode () { return true }

    /**
     * Compile a node into a JavaScript function.
     * This basically pre-calculates as much as possible and only leaves open
     * calculations which depend on a dynamic scope with variables.
     * @param {Object} math     Math.js namespace with functions and constants.
     * @param {Object} argNames An object with argument names as key and `true`
     *                          as value. Used in the SymbolNode to optimize
     *                          for arguments from user assigned functions
     *                          (see FunctionAssignmentNode) or special symbols
     *                          like `end` (see IndexNode).
     * @return {function} Returns a function which can be called like:
     *                        evalNode(scope: Object, args: Object, context: *)
     */
    _compile (math, argNames) {
      // validate fn
      if (typeof this.fn !== 'string' || !isSafeMethod(math, this.fn)) {
        if (!math[this.fn]) {
          throw new Error(
            'Function ' + this.fn + ' missing in provided namespace "math"')
        } else {
          throw new Error('No access to function "' + this.fn + '"')