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