front_end/panels/application/preloading/components/RuleSetDetailsView.ts

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as i18n from '../../../../core/i18n/i18n.js';
import * as SDK from '../../../../core/sdk/sdk.js';
import type * as Protocol from '../../../../generated/protocol.js';
import * as Formatter from '../../../../models/formatter/formatter.js';
import * as CodeMirror from '../../../../third_party/codemirror.next/codemirror.next.js';
import * as CodeHighlighter from '../../../../ui/components/code_highlighter/code_highlighter.js';
import * as TextEditor from '../../../../ui/components/text_editor/text_editor.js';
import * as UI from '../../../../ui/legacy/legacy.js';
import {html, nothing, render} from '../../../../ui/lit/lit.js';

import ruleSetDetailsViewStyles from './RuleSetDetailsView.css.js';

const UIStrings = {
  /**
   * @description Text in RuleSetDetailsView of the Application panel if no element is selected. An element here is an item in a
   *             table of speculation rules. Speculation rules define the rules when and which urls should be prefetched.
   *             https://developer.chrome.com/docs/devtools/application/debugging-speculation-rules
   */
  noElementSelected: 'No element selected',
  /**
   * @description Text in RuleSetDetailsView of the Application panel if no element is selected. An element here is an item in a
   *             table of speculation rules. Speculation rules define the rules when and which urls should be prefetched.
   *             https://developer.chrome.com/docs/devtools/application/debugging-speculation-rules
   */
  selectAnElementForMoreDetails: 'Select an element for more details',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/application/preloading/components/RuleSetDetailsView.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);

type RuleSet = Protocol.Preload.RuleSet;

const codeMirrorJsonType = await CodeHighlighter.CodeHighlighter.languageFromMIME('application/json');

export interface ViewInput {
  url: string;
  errorMessage?: string;
  editorState: CodeMirror.EditorState;
  sourceText: string;
}

export const DEFAULT_VIEW = (input: ViewInput|null, _output: object, target: HTMLElement): void => {
  // clang-format off
  render(html`
    <style>${ruleSetDetailsViewStyles}</style>
    <style>${UI.inspectorCommonStyles}</style>
    ${input
      ? html`
        <div class="content">
          <div class="ruleset-header" id="ruleset-url">${input.url}</div>
          ${input.errorMessage ? html`
            <div class="ruleset-header">
              <devtools-icon name="cross-circle" class="medium">
              </devtools-icon>
              <span id="error-message-text">${input.errorMessage}</span>
            </div>
          ` : nothing}
        </div>
        <div class="text-ellipsis">
          <devtools-text-editor .style.flexGrow=${'1'} .state=${input.editorState}></devtools-text-editor>
        </div>`
      : html`
          <div class="placeholder">
            <div class="empty-state">
              <span class="empty-state-header">${i18nString(UIStrings.noElementSelected)}</span>
              <span class="empty-state-description">${i18nString(UIStrings.selectAnElementForMoreDetails)}</span>
            </div>
          </div>`
    }
    `, target);
  // clang-format on
};

export class RuleSetDetailsView extends UI.Widget.VBox {
  readonly #view: typeof DEFAULT_VIEW;
  #ruleSet: RuleSet|null = null;
  #shouldPrettyPrint = true;

  constructor(element?: HTMLElement, view = DEFAULT_VIEW) {
    super(element, {useShadowDom: true});
    this.#view = view;
  }

  override wasShown(): void {
    super.wasShown();
    this.requestUpdate();
  }

  set ruleSet(ruleSet: RuleSet|null) {
    this.#ruleSet = ruleSet;
    this.requestUpdate();
  }

  set shouldPrettyPrint(shouldPrettyPrint: boolean) {
    this.#shouldPrettyPrint = shouldPrettyPrint;
    this.requestUpdate();
  }

  override async performUpdate(): Promise<void> {
    if (!this.#ruleSet) {
      this.#view(null, {}, this.contentElement);
      return;
    }

    const sourceText = await this.#getSourceText();
    const editorState = CodeMirror.EditorState.create({
      doc: sourceText,
      extensions: [
        TextEditor.Config.baseConfiguration(sourceText),
        CodeMirror.lineNumbers(),
        CodeMirror.EditorState.readOnly.of(true),
        codeMirrorJsonType as CodeMirror.Extension,
        CodeMirror.syntaxHighlighting(CodeHighlighter.CodeHighlighter.highlightStyle),
      ],
    });

    this.#view(
        {
          url: this.#ruleSet.url || SDK.TargetManager.TargetManager.instance().inspectedURL(),
          errorMessage: this.#ruleSet.errorMessage,
          editorState,
          sourceText,
        },
        {}, this.contentElement);
  }

  async #getSourceText(): Promise<string> {
    if (this.#shouldPrettyPrint && this.#ruleSet?.sourceText !== undefined) {
      const formattedResult =
          await Formatter.ScriptFormatter.formatScriptContent('application/json', this.#ruleSet.sourceText);
      return formattedResult.formattedContent;
    }

    return this.#ruleSet?.sourceText || '';
  }
}