cst/lib/elements/types/BinaryExpression.js

JavaScript CST Implementation

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _getPrototypeOf = require('babel-runtime/core-js/object/get-prototype-of');

var _getPrototypeOf2 = _interopRequireDefault(_getPrototypeOf);

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _possibleConstructorReturn2 = require('babel-runtime/helpers/possibleConstructorReturn');

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _inherits2 = require('babel-runtime/helpers/inherits');

var _inherits3 = _interopRequireDefault(_inherits2);

var _Expression2 = require('../Expression');

var _Expression3 = _interopRequireDefault(_Expression2);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var binaryOperators = {
    '==': true,
    '!=': true,
    '===': true,
    '!==': true,
    '<': true,
    '<=': true,
    '>': true,
    '>=': true,
    '<<': true,
    '>>': true,
    '>>>': true,
    '+': true,
    '-': true,
    '*': true,
    '/': true,
    '%': true,
    '|': true,
    '^': true,
    '&': true,
    'in': true,
    'instanceof': true,
    '**': true
};

var BinaryExpression = function (_Expression) {
    (0, _inherits3.default)(BinaryExpression, _Expression);

    // TODO: Should respect operator precedence: putting "a + b" before " * b" without parens should raise an error.

    function BinaryExpression(childNodes) {
        (0, _classCallCheck3.default)(this, BinaryExpression);
        return (0, _possibleConstructorReturn3.default)(this, (BinaryExpression.__proto__ || (0, _getPrototypeOf2.default)(BinaryExpression)).call(this, 'BinaryExpression', childNodes));
    }

    (0, _createClass3.default)(BinaryExpression, [{
        key: '_acceptChildren',
        value: function _acceptChildren(children) {
            var left = children.passExpression();
            children.skipNonCode();
            if (children.currentElement.type === 'Punctuator' || children.currentElement.type === 'Keyword') {
                children.assertToken(children.currentElement.type, binaryOperators);
            } else {
                children.assertToken('Punctuator');
            }
            var operator = children.passToken().value;
            children.skipNonCode();
            var right = children.passExpression();
            children.assertEnd();

            this.left = left;
            this.operator = operator;
            this.right = right;
        }
    }]);
    return BinaryExpression;
}(_Expression3.default);

exports.default = BinaryExpression;
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