angular-docs-cn/modules/benchmarks/src/util.ts

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

/* tslint:disable:no-console  */
urlParamsToForm();

export function getIntParameter(name: string) {
  return parseInt(getStringParameter(name), 10);
}

export function getStringParameter(name: string) {
  const els = document.querySelectorAll(`input[name="${name}"]`);
  let value: any;
  let el: any;

  for (let i = 0; i < els.length; i++) {
    el = els[i];
    const type = el.type;
    if ((type != 'radio' && type != 'checkbox') || el.checked) {
      value = el.value;
      break;
    }
  }

  if (value == null) {
    throw new Error(`Could not find and input field with name ${name}`);
  }

  return value;
}

export function bindAction(selector: string, callback: () => void) {
  document.querySelector(selector)!.addEventListener('click', callback);
}


export function profile(create: () => void, destroy: () => void, name: string) {
  return function() {
    // 'console.profile' is experimental and was removed from DOM lib in TS 3.9
    (window.console as any).profile(name);
    const noOfRuns = 150;
    let durations: number[] = [];
    let count = 0;
    while (count++ < noOfRuns) {
      const start = window.performance.now();
      create();
      const end = window.performance.now() - start;
      durations.push(end);
      destroy();
    }
    // 'console.profileEnd' is experimental and was removed from DOM lib in TS 3.9
    (window.console as any).profileEnd();
    reportProfileResults(durations, noOfRuns);
  };
}

function reportProfileResults(durations: number[], count: number) {
  const totalDuration = durations.reduce((soFar: number, duration: number) => soFar + duration, 0);
  const avgDuration = (totalDuration / count).toFixed(2);
  const minDuration = durations
                          .reduce(
                              (soFar: number, duration: number) => Math.min(soFar, duration),
                              Number.MAX_SAFE_INTEGER)
                          .toFixed(2);
  window.console.log(
      `Iterations: ${count}; cold time: ${durations[0].toFixed(2)} ms; average time: ${
          avgDuration} ms / iteration; best time: ${minDuration} ms`);
}

// helper script that will read out the url parameters
// and store them in appropriate form fields on the page
function urlParamsToForm() {
  const regex = /(\w+)=(\w+)/g;
  const search = decodeURIComponent(location.search);
  let match: any[]|null;
  while (match = regex.exec(search)) {
    const name = match[1];
    const value = match[2];
    const els = document.querySelectorAll('input[name="' + name + '"]');
    let el: any;
    for (let i = 0; i < els.length; i++) {
      el = els[i];
      if (el.type === 'radio' || el.type === 'checkbox') {
        el.checked = el.value === value;
      } else {
        el.value = value;
      }
    }
  }
}