ecmascript-version-detector/lib/ecmascript-version-detector.js

ecmascript version detector

// LICENSE : MIT
"use strict";

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.parse = parse;
var babylon = require("babylon");
var ASTQ = require("astq");
var ObjectAssign = require("object.assign");
var astq = new ASTQ();
var types = require("../data/index.json");
/**
 * @param {string} code
 * @param {Object} [babylonOptions]
 * @returns {Object[]}
 */
function parseCode(code, babylonOptions) {
    var defaultOption = {
        sourceType: "module",
        plugins: ["jsx", "flow", "asyncFunctions", "classConstructorCall", "doExpressions", "trailingFunctionCommas", "objectRestSpread", "decorators", "classProperties", "exportExtensions", "exponentiationOperator", "asyncGenerators", "functionBind", "functionSent"]
    };
    return require("babylon").parse(code, babylonOptions || defaultOption);
}

/**
 * parse `code` and return `results`.
 * Sometimes, the `parse` function throw parse error.
 * @param {string} code
 * @param {{babylonOptions: Object}} [options]
 * @returns {{selector:string, version:string, node: Object, en: Object}[]} results
 * @throws
 */
function parse(code) {
    var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];

    var babylonOptions = options.babylonOptions;
    var AST = parseCode(code, babylonOptions);
    var infoList = [];
    // ignore to add duplicated range
    var canPushInfo = function canPushInfo(type, match) {
        var start = match.start;
        var end = match.end;

        var sameRangeInfo = infoList.find(function (targetInfo) {
            return targetInfo.node.start === start && targetInfo.node.end === end;
        });
        if (!sameRangeInfo) {
            return true;
        }
        // Specificity - prefer detail selector
        return type.selector.length > sameRangeInfo.selector.length;
    };
    types.forEach(function (type) {
        var selector = type.selector;
        var results = astq.query(AST, selector);
        if (results.length === 0) {
            return false;
        }
        results.forEach(function (match) {
            if (!canPushInfo(type, match)) {
                return;
            }
            var result = ObjectAssign({}, type, { node: match });
            infoList.push(result);
        });
        return true;
    });
    return infoList;
}
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