Entwicklungspraxis für VSCode-Plug-Ins: Implementierung eines Code-Diagnose-Plug-Ins

> git clone https://github.com/microsoft/vscode-extension-samples.git
> cd vscode-extension-samples/lsp-sample
> npm install
> npm run compile
> code .

// client/src/extension.ts
export function activate(context: ExtensionContext) {
    ...
    const clientOptions: LanguageClientOptions = {
        documentSelector: [{ scheme: 'file', language: 'vue' }], // 打开 vue 文件时才激活
        ...
    };
    client = new LanguageClient(...);
    client.start();
}

// server/src/server.ts
import {
    createConnection
    TextDocuments,
    ProposedFeatures,
    ...
} from 'vscode-languageserver/node';
const connection = createConnection(ProposedFeatures.all);
const documents: TextDocuments<TextDocument> = new TextDocuments(TextDocument);
documents.onDidChangeContent(change => {
    // 文档发生变化时，校验文档
    validateTextDocument(change.document);
});

async function validateTextDocument(textDocument: TextDocument): Promise<void> {
    ...
    // 拿到诊断结果
    const diagnostics = getDiagnostics(textDocument, settings);
    // 发给客户端
    connection.sendDiagnostics({ uri: textDocument.uri, diagnostics });
}
// 提供快速修复的操作
connection.onCodeAction(provideCodeActions);

async function provideCodeActions(params: CodeActionParams): Promise<CodeAction[]> {
    ...
    return quickfix(textDocument, params);
}

const VueParser = require('@vue/compiler-dom');
// 该函数返回诊断结果客户端
function getDiagnostics(textDocument: TextDocument, settings: any): Diagnostic[] {
	const text = textDocument.getText();
	const res = VueParser.parse(text);
	const [template, script] = res.children;
	return [
		...analyzeTemplate(template), // 解析 template 得到诊断结果
		...analyzeScript(script, textDocument), // 解析 js 得到诊断结果
	];
}
// 分析 js 语法
function analyzeScript(script: any, textDocument: TextDocument) {
  const scriptAst = parser.parse(script.children[0]?.content, {
    sourceType: 'module',
    plugins: [
      'typescript', // typescript
      ['decorators', { decoratorsBeforeExport: true }], // 装饰器
      'classProperties', // ES6 class 写法
      'classPrivateProperties',
    ],
  });

function deepLoopData(
  data: AstTemplateInterface[],
  handler: Function,
  diagnostics: Diagnostic[],
) {
  function dfs(data: AstTemplateInterface[]) {
    for (let i = 0; i < data.length; i++) {
      handler(data[i], diagnostics); // 在这一步对代码进行处理
      if (data[i]?.children?.length) {
        dfs(data[i].children);
      } else {
        continue;
      }
    }
  }
  dfs(data);
}

function analyzeTemplate(template: any) {
  const diagnostics: Diagnostic[] = [];
  deepLoopData(template.children, templateHandler, diagnostics);
  return diagnostics;
}
function templateHandler(currData: AstTemplateInterface, diagnostics: Diagnostic[]){
   // ...对代码节点检查
}

 traverse(scriptAst, {
    enter(path: any) {
      ...
    }
 }

function isLongFunction(node: Record<string, any>) {
  return (
    // 如果结束位置的行 - 开始位置的行 > 80 的话，我们认为这个函数写得太长了
    node.type === &#39;ClassMethod&#39; && node.loc.end.line - node.loc.start.line > 80
  );
}

traverse(scriptAst, {
    enter(path: any) {
        const { node } = path;
        if (isLongFunction(node)) {
            const diagnostic: Diagnostic ={
                severity: DiagnosticSeverity.Warning,
                range: getPositionRange(node, scriptStart),
                message: '尽可能保持一个函数的单一职责原则，单个函数不宜超过 80 行',
                source: 'Code Review 指南',
            }
            diagnostics.push(diagnostic);
        }
        ...   
    }
});

// attributeOrderValidator 得到判断结果 和 修复后的代码
const {isGoodSort, newText} = attributeOrderValidator(props, currData.loc.source);
    if (!isGoodSort) {
      const range = {
        start: {
          line: props[0].loc.start.line - 1,
          character: props[0].loc.start.column - 1,
        },
        end: {
          line: props[props.length - 1].loc.end.line - 1,
          character: props[props.length - 1].loc.end.column - 1,
        },
      }
      let diagnostic: Diagnostic = genDiagnostics(
        'vue template 上的属性顺序',
        range
      );
      if (newText) { // 如果有修复后的代码
        // 将快速修复数据保存在 diagnostic.data
        diagnostic.data = {
          title: '按照 Code Review 指南的顺序修复',
          newText,
        }
      }
      diagnostics.push(diagnostic);
    }

export function quickfix(
  textDocument: TextDocument,
  params: CodeActionParams
): CodeAction[] {
  const diagnostics = params.context.diagnostics;
  if (isNullOrUndefined(diagnostics) || diagnostics.length === 0) {
    return [];
  }
  const codeActions: CodeAction[] = [];
  diagnostics.forEach((diag) => {
    if (diag.severity === DiagnosticSeverity.Warning) {
      if (diag.data) { // 如果有快速修复数据
        // 添加快速修复
        codeActions.push({
          title: (diag.data as any)?.title,
          kind: CodeActionKind.QuickFix, // 快速修复
          diagnostics: [diag], // 属于哪个诊断的操作
          edit: {
            changes: {
                [params.textDocument.uri]: [
                  {
                    range: diag.range,
                    newText: (diag.data as any)?.newText, // 修复后的内容
                  },
                ],
              },
           },
        });
    } 
  }
});

import {
    createConnection
    TextDocuments,
    ProposedFeatures,
    ...
} from 'vscode-languageserver/node';
const connection = createConnection(ProposedFeatures.all);
const documents: TextDocuments<TextDocument> = new TextDocuments(TextDocument);
documents.onDidChangeContent(change => {
    ...
    // 拿到诊断结果
    const diagnostics = getDiagnostics(textDocument, settings);
    // 发给客户端
    connection.sendDiagnostics({ uri: textDocument.uri, diagnostics });
});

// 提供快速修复的操作
connection.onCodeAction(provideCodeActions);

async function provideCodeActions(params: CodeActionParams): Promise<CodeAction[]> {
    ...
    return quickfix(textDocument, params);
}