@bigcommerce/stencil-paper/helpers/compare.js

'use strict';

function helper(paper) {
    paper.handlebars.registerHelper('compare', function (lvalue, rvalue) {
        const options = arguments[arguments.length - 1];
        var operator;
        var operators;
        var result;

        if (arguments.length < 3) {
            throw new Error("Handlerbars Helper 'compare' needs 2 parameters");
        }

        operator = options.hash.operator || "==";

        operators = {
            '==': function (l, r) { return l == r; },
            '===': function (l, r) { return l === r; },
            '!=': function (l, r) { return l != r; },
            '!==': function (l, r) { return l !== r; },
            '<': function (l, r) { return l < r; },
            '>': function (l, r) { return l > r; },
            '<=': function (l, r) { return l <= r; },
            '>=': function (l, r) { return l >= r; },
            'typeof': function (l, r) { return typeof l == r; }
        };

        // getOwnPropertyNames is used because checking the property
        // directly (like operators[x]) is insecure
        // (we could use switch instead)
        if (Object.getOwnPropertyNames(operators).indexOf(operator) === -1) {
            throw new Error("Handlerbars Helper 'compare' doesn't know the operator " + operator);
        }

        result = operators[operator](lvalue, rvalue);

        if (result) {
            return options.fn(this);
        } else {
            return options.inverse(this);
        }
    });
}

module.exports = helper;