serverless-artillery/lib/lambda/node_modules/filtrex/src/filtrex.js

A serverless performance testing tool. `serverless` + `artillery` = crush. a.k.a. Orbital Laziers [sic]

/**
 * Filtrex provides compileExpression() to compile user expressions to JavaScript.
 *
 * See https://github.com/joewalnes/filtrex for tutorial, reference and examples.
 * MIT License.
 *
 * Includes Jison by Zachary Carter. See http://jison.org/
 *
 * -Joe Walnes
 */
module.exports = function compileExpression(expression, extraFunctions /* optional */) {

    var parser = require('./parser');

    var functions = {
        abs: Math.abs,
        ceil: Math.ceil,
        floor: Math.floor,
        log: Math.log,
        max: Math.max,
        min: Math.min,
        random: Math.random,
        round: Math.round,
        sqrt: Math.sqrt,
    };
    if (extraFunctions) {
        for (var name in extraFunctions) {
            if (extraFunctions.hasOwnProperty(name)) {
                functions[name] = extraFunctions[name];
            }
        }
    }
    var tree = parser.parse(expression);

    var js = [];
    js.push('return ');
    function toJs(node) {
        if (Array.isArray(node)) {
            node.forEach(toJs);
        } else {
            js.push(node);
        }
    }
    tree.forEach(toJs);
    js.push(';');

    var func = new Function('functions', 'data', js.join(''));
    return function(data) {
        return func(functions, data);
    };
}