WIP
This commit is contained in:
Antonio Scandurra
parent
4d621f355d
commit
18eb4a7292
10 changed files with 1017 additions and 194 deletions
217
crates/prettier2/src/prettier_server.js
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217
crates/prettier2/src/prettier_server.js
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const { Buffer } = require('buffer');
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const fs = require("fs");
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const path = require("path");
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const { once } = require('events');
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const prettierContainerPath = process.argv[2];
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if (prettierContainerPath == null || prettierContainerPath.length == 0) {
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process.stderr.write(`Prettier path argument was not specified or empty.\nUsage: ${process.argv[0]} ${process.argv[1]} prettier/path\n`);
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process.exit(1);
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}
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fs.stat(prettierContainerPath, (err, stats) => {
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if (err) {
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process.stderr.write(`Path '${prettierContainerPath}' does not exist\n`);
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process.exit(1);
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}
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if (!stats.isDirectory()) {
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process.stderr.write(`Path '${prettierContainerPath}' exists but is not a directory\n`);
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process.exit(1);
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}
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});
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const prettierPath = path.join(prettierContainerPath, 'node_modules/prettier');
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class Prettier {
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constructor(path, prettier, config) {
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this.path = path;
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this.prettier = prettier;
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this.config = config;
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}
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}
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(async () => {
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let prettier;
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let config;
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try {
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prettier = await loadPrettier(prettierPath);
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config = await prettier.resolveConfig(prettierPath) || {};
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} catch (e) {
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process.stderr.write(`Failed to load prettier: ${e}\n`);
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process.exit(1);
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}
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process.stderr.write(`Prettier at path '${prettierPath}' loaded successfully, config: ${JSON.stringify(config)}\n`);
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process.stdin.resume();
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handleBuffer(new Prettier(prettierPath, prettier, config));
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})()
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async function handleBuffer(prettier) {
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for await (const messageText of readStdin()) {
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let message;
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try {
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message = JSON.parse(messageText);
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} catch (e) {
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sendResponse(makeError(`Failed to parse message '${messageText}': ${e}`));
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continue;
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}
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// allow concurrent request handling by not `await`ing the message handling promise (async function)
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handleMessage(message, prettier).catch(e => {
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sendResponse({ id: message.id, ...makeError(`error during message handling: ${e}`) });
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});
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}
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}
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const headerSeparator = "\r\n";
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const contentLengthHeaderName = 'Content-Length';
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async function* readStdin() {
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let buffer = Buffer.alloc(0);
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let streamEnded = false;
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process.stdin.on('end', () => {
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streamEnded = true;
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});
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process.stdin.on('data', (data) => {
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buffer = Buffer.concat([buffer, data]);
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});
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async function handleStreamEnded(errorMessage) {
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sendResponse(makeError(errorMessage));
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buffer = Buffer.alloc(0);
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messageLength = null;
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await once(process.stdin, 'readable');
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streamEnded = false;
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}
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try {
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let headersLength = null;
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let messageLength = null;
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main_loop: while (true) {
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if (messageLength === null) {
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while (buffer.indexOf(`${headerSeparator}${headerSeparator}`) === -1) {
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if (streamEnded) {
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await handleStreamEnded('Unexpected end of stream: headers not found');
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continue main_loop;
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} else if (buffer.length > contentLengthHeaderName.length * 10) {
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await handleStreamEnded(`Unexpected stream of bytes: no headers end found after ${buffer.length} bytes of input`);
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continue main_loop;
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}
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await once(process.stdin, 'readable');
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}
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const headers = buffer.subarray(0, buffer.indexOf(`${headerSeparator}${headerSeparator}`)).toString('ascii');
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const contentLengthHeader = headers.split(headerSeparator)
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.map(header => header.split(':'))
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.filter(header => header[2] === undefined)
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.filter(header => (header[1] || '').length > 0)
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.find(header => (header[0] || '').trim() === contentLengthHeaderName);
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const contentLength = (contentLengthHeader || [])[1];
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if (contentLength === undefined) {
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await handleStreamEnded(`Missing or incorrect ${contentLengthHeaderName} header: ${headers}`);
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continue main_loop;
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}
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headersLength = headers.length + headerSeparator.length * 2;
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messageLength = parseInt(contentLength, 10);
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}
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while (buffer.length < (headersLength + messageLength)) {
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if (streamEnded) {
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await handleStreamEnded(
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`Unexpected end of stream: buffer length ${buffer.length} does not match expected header length ${headersLength} + body length ${messageLength}`);
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continue main_loop;
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}
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await once(process.stdin, 'readable');
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}
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const messageEnd = headersLength + messageLength;
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const message = buffer.subarray(headersLength, messageEnd);
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buffer = buffer.subarray(messageEnd);
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headersLength = null;
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messageLength = null;
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yield message.toString('utf8');
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}
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} catch (e) {
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sendResponse(makeError(`Error reading stdin: ${e}`));
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} finally {
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process.stdin.off('data', () => { });
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}
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}
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async function handleMessage(message, prettier) {
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const { method, id, params } = message;
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if (method === undefined) {
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throw new Error(`Message method is undefined: ${JSON.stringify(message)}`);
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}
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if (id === undefined) {
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throw new Error(`Message id is undefined: ${JSON.stringify(message)}`);
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}
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if (method === 'prettier/format') {
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if (params === undefined || params.text === undefined) {
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throw new Error(`Message params.text is undefined: ${JSON.stringify(message)}`);
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}
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if (params.options === undefined) {
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throw new Error(`Message params.options is undefined: ${JSON.stringify(message)}`);
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}
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let resolvedConfig = {};
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if (params.options.filepath !== undefined) {
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resolvedConfig = await prettier.prettier.resolveConfig(params.options.filepath) || {};
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}
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const options = {
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...(params.options.prettierOptions || prettier.config),
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...resolvedConfig,
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parser: params.options.parser,
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plugins: params.options.plugins,
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path: params.options.filepath
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};
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process.stderr.write(`Resolved config: ${JSON.stringify(resolvedConfig)}, will format file '${params.options.filepath || ''}' with options: ${JSON.stringify(options)}\n`);
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const formattedText = await prettier.prettier.format(params.text, options);
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sendResponse({ id, result: { text: formattedText } });
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} else if (method === 'prettier/clear_cache') {
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prettier.prettier.clearConfigCache();
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prettier.config = await prettier.prettier.resolveConfig(prettier.path) || {};
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sendResponse({ id, result: null });
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} else if (method === 'initialize') {
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sendResponse({
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id,
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result: {
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"capabilities": {}
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}
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});
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} else {
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throw new Error(`Unknown method: ${method}`);
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}
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}
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function makeError(message) {
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return {
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error: {
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"code": -32600, // invalid request code
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message,
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}
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};
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}
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function sendResponse(response) {
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const responsePayloadString = JSON.stringify({
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jsonrpc: "2.0",
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...response
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});
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const headers = `${contentLengthHeaderName}: ${Buffer.byteLength(responsePayloadString)}${headerSeparator}${headerSeparator}`;
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process.stdout.write(headers + responsePayloadString);
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}
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function loadPrettier(prettierPath) {
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return new Promise((resolve, reject) => {
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fs.access(prettierPath, fs.constants.F_OK, (err) => {
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if (err) {
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reject(`Path '${prettierPath}' does not exist.Error: ${err}`);
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} else {
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try {
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resolve(require(prettierPath));
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} catch (err) {
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reject(`Error requiring prettier module from path '${prettierPath}'.Error: ${err}`);
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}
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}
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});
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});
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}
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