Function parseAddSubtract

src/expression/parse.js:1034–1058

* add or subtract * @return {Node} node * @private

(state)

   * @private
   */
  function parseAddSubtract (state) {
    let node, name, fn, params

    node = parseMultiplyDivideModulus(state)

    const operators = {
      '+': 'add',
      '-': 'subtract'
    }
    while (hasOwnProperty(operators, state.token)) {
      name = state.token
      fn = operators[name]

      getTokenSkipNewline(state)
      const rightNode = parseMultiplyDivideModulus(state)
      if (rightNode.isPercentage) {
        params = [node, new OperatorNode('*', 'multiply', [node, rightNode])]
      } else {
        params = [node, rightNode]
      }
      node = new OperatorNode(name, fn, params)
    }

    return node
  }

  /**
   * multiply, divide, modulus