1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 * This script compares the AST of two JavaScript files passed as arguments.
7 * The script exits with a 0 status code if both files parse properly and the
8 * ASTs of both files are identical modulo location differences. The script
9 * exits with status code 1 if any of these conditions don't hold.
11 * This script is used as part of packaging to verify minified JavaScript files
12 * are identical to their original files.
15 // Available to the js shell.
16 /* global snarf, scriptArgs, quit */
20 function ast(filename) {
21 return JSON.stringify(Reflect.parse(snarf(filename), { loc: 0 }));
24 if (scriptArgs.length !== 2) {
25 throw new Error("usage: js js-compare-ast.js FILE1.js FILE2.js");
28 var ast0 = ast(scriptArgs[0]);
29 var ast1 = ast(scriptArgs[1]);
31 quit(ast0 == ast1 ? 0 : 1);