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/**

* Copyright (c) Meta Platforms, Inc. and affiliates.

*

* This source code is licensed under the MIT license found in the

* LICENSE file in the root directory of this source tree.

*

* @format

*/

'use strict';

const {exec} = require('shelljs');

const https = require('https');

const fs = require('fs');

const path = require('path');

const os = require('os');

const yargs = require('yargs');

const googleJavaFormatUrl =

'https://github.com/google/google-java-format/releases/download/google-java-format-1.7/google-java-format-1.7-all-deps.jar';

const googleJavaFormatPath = path.join(

os.tmpdir(),

'google-java-format-all-deps.jar',

);

const javaFilesCommand = 'find ./ReactAndroid -name "*.java"';

function _download(url, downloadPath, resolve, reject, redirectCount) {

https.get(url, response => {

switch (response.statusCode) {

case 302: //Permanent Redirect

if (redirectCount === 0) {

throw new Error(

`Unhandled response code (HTTP${response.statusCode}) while retrieving google-java-format binary from ${url}`,

);

}

_download(

response.headers.location,

downloadPath,

resolve,

reject,

redirectCount - 1,

);

break;

case 200: //OK

const file = fs.createWriteStream(downloadPath);

response.pipe(file);

file.on('finish', () => file.close(() => resolve()));

break;

default:

reject(

`Unhandled response code (HTTP${response.statusCode}) while retrieving google-java-format binary from ${url}`,

);

}

});

}

function download(url, downloadPath) {

return new Promise((resolve, reject) => {

_download(url, downloadPath, resolve, reject, 1);

});

}

function filesWithLintingIssues() {

const proc = exec(

`java -jar ${googleJavaFormatPath} --dry-run $(${javaFilesCommand})`,

{silent: true},

);

if (proc.code !== 0) {

throw new Error(proc.stderr);

}

return proc.stdout.split('\n').filter(x => x);

}

function unifiedDiff(file) {

const lintedProc = exec(

`java -jar ${googleJavaFormatPath} --set-exit-if-changed ${file}`,

{silent: true},

);

//Exit code 1 indicates lint violations, which is what we're expecting

if (lintedProc.code !== 1) {

throw new Error(lintedProc.stderr);

}

const diffProc = lintedProc.exec(`diff -U 0 ${file} -`, {silent: true});

//Exit code 0 if inputs are the same, 1 if different, 2 if trouble.

if (diffProc.code !== 0 && diffProc.code !== 1) {

throw new Error(diffProc.stderr);

}

return {

file,

diff: diffProc.stdout,

};

}

function extractRangeInformation(range) {

//eg;

// @@ -54 +54,2 @@

// @@ -1,3 +1,9 @@

const regex = /^@@ [-+](\d+,?\d+) [-+](\d+,?\d+) @@$/;

const match = regex.exec(range);

if (match) {

const original = match[1].split(',');

const updated = match[2].split(',');

return {

original: {

line: parseInt(original[0], 10),

lineCount: parseInt(original[1], 10) || 1,

},

updated: {

line: parseInt(updated[0], 10),

lineCount: parseInt(updated[1], 10) || 1,

},

};

}

}

function parseChanges(file, diff) {

let group = null;

const groups = [];

diff.split('\n').forEach(line => {

const range = extractRangeInformation(line);

if (range) {

group = {

range,

description: [line],

};

groups.push(group);

} else if (group) {

group.description.push(line);

}

});

return groups.map(x => ({

file,

line: x.range.original.line,

lineCount: x.range.original.lineCount,

description: x.description.join('\n'),

}));

}

async function main() {

const {argv} = yargs

.scriptName('lint-java')

.usage('Usage: $0 [options]')

.command(

'$0',

'Downloads the google-java-format package and reformats Java source code to comply with Google Java Style.\n\nSee https://github.com/google/google-java-format',

)

.option('check', {

type: 'boolean',

description:

'Outputs a list of files with lint violations.\nExit code is set to 1 if there are violations, otherwise 0.\nDoes not reformat lint issues.',

})

.option('diff', {

type: 'boolean',

description:

'Outputs a diff of the lint fix changes in json format.\nDoes not reformat lint issues.',

});

await download(googleJavaFormatUrl, googleJavaFormatPath);

if (argv.check) {

const files = filesWithLintingIssues();

files.forEach(x => console.log(x));

process.exit(files.length === 0 ? 0 : 1);

return;

}

if (argv.diff) {

const suggestions = filesWithLintingIssues()

.map(unifiedDiff)

.filter(x => x)

.map(x => parseChanges(x.file, x.diff))

.reduce((accumulator, current) => accumulator.concat(current), []);

console.log(JSON.stringify(suggestions));

return;

}

const proc = exec(

`java -jar ${googleJavaFormatPath} --set-exit-if-changed --replace $(${javaFilesCommand})`,

);

process.exit(proc.code);

}

(async () => {

await main();

})();