acorn-benchmark.js

// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

const acorn = require("acorn");
const fs = require("fs");
const walk = require("acorn/dist/walk");

const payloads = [
  {
    name: "backbone-1.1.0.js",
    options: { ecmaVersion: 5, sourceType: "script" }
  },
  {
    name: "jquery-3.2.1.js",
    options: { ecmaVersion: 5, sourceType: "script" }
  },
  {
    name: "lodash.core-4.17.4.js",
    options: { ecmaVersion: 5, sourceType: "script" }
  },
  {
    name: "preact-8.2.5.js",
    options: { ecmaVersion: 5, sourceType: "script" }
  },
  {
    name: "redux.min-3.7.2.js",
    options: { ecmaVersion: 5, sourceType: "script" }
  },
  {
    name: "speedometer-es2015-test-2.0.js",
    options: { ecmaVersion: 6, sourceType: "script" }
  },
  {
    name: "underscore-1.8.3.js",
    options: { ecmaVersion: 5, sourceType: "script" }
  },
  {
    name: "vue.runtime.esm-nobuble-2.4.4.js",
    options: { ecmaVersion: 7, sourceType: "module" }
  }
].map(({ name, options }) => ({
  payload: fs.readFileSync(`third_party/${name}`, "utf8"),
  options: Object.assign(options, { locations: true }, { ranges: true })
}));

module.exports = {
  name: "acorn",
  fn() {
    return payloads.map(({ payload, options }) => {
      let count = 0;

      // Test the tokenizer by counting the resulting tokens.
      for (const token of acorn.tokenizer(payload, options)) {
        count++;
      }

      // Test the parser.
      const ast = acorn.parse(payload, options);

      // Test the AST walker.
      walk.full(ast, node => count++);
      return count;
    });
  }
};