eslint/lib/testers/test-parser.js

/**
 * @author Toru Nagashima <https://github.com/mysticatea>
 */
"use strict";

const espree = require("espree");
const Traverser = require("../util/traverser");

/**
 * Define `start`/`end` properties as throwing error.
 * @param {ASTNode} node The node to define.
 * @returns {void}
 */
function defineStartEndAsError(node) {
    Object.defineProperty(node, "start", {
        get() {
            throw new Error("Use node.range[0] instead of node.start");
        },
        configurable: true,
        enumerable: false
    });
    Object.defineProperty(node, "end", {
        get() {
            throw new Error("Use node.range[1] instead of node.end");
        },
        configurable: true,
        enumerable: false
    });
}

/**
 * Define `start`/`end` properties of all nodes of the given AST as throwing error.
 * @param {ASTNode} ast The root node to errorize `start`/`end` properties.
 * @returns {void}
 */
function defineStartEndAsErrorInTree(ast) {
    new Traverser().traverse(ast, { enter: defineStartEndAsError });
    ast.tokens.forEach(defineStartEndAsError);
    ast.comments.forEach(defineStartEndAsError);
}

module.exports.parse = (code, options) => {
    const ret = espree.parse(code, options);

    defineStartEndAsErrorInTree(ret.ast || ret);

    return ret;
};