lighthouse/report/renderer/pwa-category-renderer.js

/**
 * @license
 * Copyright 2018 The Lighthouse Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS-IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';

import {Util} from './util.js';
import {CategoryRenderer} from './category-renderer.js';

export class PwaCategoryRenderer extends CategoryRenderer {
  /**
   * @param {LH.ReportResult.Category} category
   * @param {Object<string, LH.Result.ReportGroup>} [groupDefinitions]
   * @return {Element}
   */
  render(category, groupDefinitions = {}) {
    const categoryElem = this.dom.createElement('div', 'lh-category');
    this.createPermalinkSpan(categoryElem, category.id);
    categoryElem.appendChild(this.renderCategoryHeader(category, groupDefinitions));

    const auditRefs = category.auditRefs;

    // Regular audits aren't split up into pass/fail/notApplicable clumps, they're
    // all put in a top-level clump that isn't expandable/collapsible.
    const regularAuditRefs = auditRefs.filter(ref => ref.result.scoreDisplayMode !== 'manual');
    const auditsElem = this._renderAudits(regularAuditRefs, groupDefinitions);
    categoryElem.appendChild(auditsElem);

    // Manual audits are still in a manual clump.
    const manualAuditRefs = auditRefs.filter(ref => ref.result.scoreDisplayMode === 'manual');
    const manualElem = this.renderClump('manual',
      {auditRefs: manualAuditRefs, description: category.manualDescription});
    categoryElem.appendChild(manualElem);

    return categoryElem;
  }

  /**
   * @param {LH.ReportResult.Category} category
   * @param {Record<string, LH.Result.ReportGroup>} groupDefinitions
   * @return {DocumentFragment}
   */
  renderScoreGauge(category, groupDefinitions) {
    // Defer to parent-gauge style if category error.
    if (category.score === null) {
      return super.renderScoreGauge(category, groupDefinitions);
    }

    const tmpl = this.dom.createComponent('gaugePwa');
    const wrapper = this.dom.find('a.lh-gauge--pwa__wrapper', tmpl);
    this.dom.safelySetHref(wrapper, `#${category.id}`);

    // Correct IDs in case multiple instances end up in the page.
    const svgRoot = tmpl.querySelector('svg');
    if (!svgRoot) throw new Error('no SVG element found in PWA score gauge template');
    PwaCategoryRenderer._makeSvgReferencesUnique(svgRoot);

    const allGroups = this._getGroupIds(category.auditRefs);
    const passingGroupIds = this._getPassingGroupIds(category.auditRefs);

    if (passingGroupIds.size === allGroups.size) {
      wrapper.classList.add('lh-badged--all');
    } else {
      for (const passingGroupId of passingGroupIds) {
        wrapper.classList.add(`lh-badged--${passingGroupId}`);
      }
    }

    this.dom.find('.lh-gauge__label', tmpl).textContent = category.title;
    wrapper.title = this._getGaugeTooltip(category.auditRefs, groupDefinitions);
    return tmpl;
  }

  /**
   * Returns the group IDs found in auditRefs.
   * @param {Array<LH.ReportResult.AuditRef>} auditRefs
   * @return {!Set<string>}
   */
  _getGroupIds(auditRefs) {
    const groupIds = auditRefs.map(ref => ref.group).filter(/** @return {g is string} */ g => !!g);
    return new Set(groupIds);
  }

  /**
   * Returns the group IDs whose audits are all considered passing.
   * @param {Array<LH.ReportResult.AuditRef>} auditRefs
   * @return {Set<string>}
   */
  _getPassingGroupIds(auditRefs) {
    const uniqueGroupIds = this._getGroupIds(auditRefs);

    // Remove any that have a failing audit.
    for (const auditRef of auditRefs) {
      if (!Util.showAsPassed(auditRef.result) && auditRef.group) {
        uniqueGroupIds.delete(auditRef.group);
      }
    }

    return uniqueGroupIds;
  }

  /**
   * Returns a tooltip string summarizing group pass rates.
   * @param {Array<LH.ReportResult.AuditRef>} auditRefs
   * @param {Record<string, LH.Result.ReportGroup>} groupDefinitions
   * @return {string}
   */
  _getGaugeTooltip(auditRefs, groupDefinitions) {
    const groupIds = this._getGroupIds(auditRefs);

    const tips = [];
    for (const groupId of groupIds) {
      const groupAuditRefs = auditRefs.filter(ref => ref.group === groupId);
      const auditCount = groupAuditRefs.length;
      const passedCount = groupAuditRefs.filter(ref => Util.showAsPassed(ref.result)).length;

      const title = groupDefinitions[groupId].title;
      tips.push(`${title}: ${passedCount}/${auditCount}`);
    }

    return tips.join(', ');
  }

  /**
   * Render non-manual audits in groups, giving a badge to any group that has
   * all passing audits.
   * @param {Array<LH.ReportResult.AuditRef>} auditRefs
   * @param {Object<string, LH.Result.ReportGroup>} groupDefinitions
   * @return {Element}
   */
  _renderAudits(auditRefs, groupDefinitions) {
    const auditsElem = this.renderUnexpandableClump(auditRefs, groupDefinitions);

    // Add a 'badged' class to group if all audits in that group pass.
    const passsingGroupIds = this._getPassingGroupIds(auditRefs);
    for (const groupId of passsingGroupIds) {
      const groupElem = this.dom.find(`.lh-audit-group--${groupId}`, auditsElem);
      groupElem.classList.add('lh-badged');
    }

    return auditsElem;
  }

  /**
   * Alters SVG id references so multiple instances of an SVG element can coexist
   * in a single page. If `svgRoot` has a `<defs>` block, gives all elements defined
   * in it unique ids, then updates id references (`<use xlink:href="...">`,
   * `fill="url(#...)"`) to the altered ids in all descendents of `svgRoot`.
   * @param {SVGElement} svgRoot
   */
  static _makeSvgReferencesUnique(svgRoot) {
    const defsEl = svgRoot.querySelector('defs');
    if (!defsEl) return;

    const idSuffix = Util.getUniqueSuffix();
    const elementsToUpdate = defsEl.querySelectorAll('[id]');
    for (const el of elementsToUpdate) {
      const oldId = el.id;
      const newId = `${oldId}-${idSuffix}`;
      el.id = newId;

      // Update all <use>s.
      const useEls = svgRoot.querySelectorAll(`use[href="#${oldId}"]`);
      for (const useEl of useEls) {
        useEl.setAttribute('href', `#${newId}`);
      }

      // Update all fill="url(#...)"s.
      const fillEls = svgRoot.querySelectorAll(`[fill="url(#${oldId})"]`);
      for (const fillEl of fillEls) {
        fillEl.setAttribute('fill', `url(#${newId})`);
      }
    }
  }
}