Addition of Boa to esvu (#53)

README.md

@@ -36,9 +36,10 @@ installing engines to make eshost automatically find the installed engines.
 
 | Engine             | Binary Names                     | `darwin-x64` | `darwin-arm64` | `linux-ia32` | `linux-x64` | `linux-arm64` | `win32-ia32` | `win32-x64` |
 | ------------------ | -------------------------------- | ------------ | -------------- | ------------ | ----------- | ------------- | ------------ | ----------- |
-| [Chakra][]         | `ch`, `chakra`                   | ✅           |                |              | ✅          |               | ✅           | ✅          |
-| [engine262][]      | `engine262`                      | ✅           | ✅             | ✅           | ✅          | ✅            | ✅           | ✅          |
-| [GraalJS][]        | `graaljs`                        | ✅           | ✅             |              | ✅          | ✅            |              | ✅          |
+| [Boa][]            | `boa`,                           | ✅           |                |              | ✅         |               |              | ✅          |
+| [Chakra][]         | `ch`, `chakra`                   | ✅           |                |              | ✅          |               | ✅           | ✅        |
+| [engine262][]      | `engine262`                      | ✅           | ✅             | ✅           | ✅          | ✅            | ✅           | ✅       |
+| [GraalJS][]        | `graaljs`                        | ✅           | ✅             |              | ✅          | ✅            |              | ✅        |
 | [Hermes][]         | `hermes`                         | ✅           | ✅             |              |             |               |              | ✅          |
 | [LibJS][]          | `serenity-js`                    | ✅           | ✅             |              | ✅          |               |              |             |
 | [JavaScriptCore][] | `jsc`, `javascriptcore`          | ✅           | ✅             |              | ✅          |               |              | ✅          |
@@ -50,6 +51,7 @@ installing engines to make eshost automatically find the installed engines.
 Some binaries may be exposed as batch/shell scripts to properly handling shared library loading. Some binaries on
 64-bit systems may be natively 32-bit.
 
+[Boa]: https://boajs.dev/
 [eshost-cli]: https://github.com/bterlson/eshost-cli
 [Chakra]: https://github.com/microsoft/chakracore
 [engine262]: https://engine262.js.org

src/engines/boa.js

@@ -0,0 +1,81 @@
+'use strict';
+
+const assert = require('assert');
+const execa = require('execa');
+const { join } = require('path');
+const fetch = require('node-fetch');
+const { copyFileSync, chmodSync, existsSync, mkdirSync } = require('fs');
+const Installer = require('../installer');
+const { platform } = require('../common');
+
+const binaryName = platform.startsWith('win') ? 'boa.exe' : 'boa';
+
+function getFilename() {
+  switch (platform) {
+    case 'darwin-x64':
+      return 'boa-macos-amd64';
+    case 'linux-x64':
+      return 'boa-linux-amd64';
+    case 'win32-x64':
+      return 'boa-windows-amd64';
+    default:
+      throw new Error(`No Boa builds available for ${platform}`);
+  }
+}
+
+class BoaInstaller extends Installer {
+  constructor(...args) {
+    super(...args);
+    this.binPath = undefined;
+  }
+
+  static resolveVersion(version) {
+    if (version === 'latest') {
+      return fetch('https://api.github.com/repos/boa-dev/boa/releases/latest')
+        .then((r) => r.json())
+        .then((r) => r.tag_name);
+    }
+    return version;
+  }
+
+  getDownloadURL(version) {
+    return `https://github.com/boa-dev/boa/releases/download/${version}/${getFilename()}`;
+  }
+
+  async extract() {
+    // The file is not zipped so we don't need to do any extraction here
+    // The file doesn't seem to be executable so we need to set it manually
+    chmodSync(this.downloadPath, '755');
+    // Windows will fail if the extractedPath doesn't exist
+    if (!existsSync(this.extractedPath)) {
+      mkdirSync(this.extractedPath);
+    }
+    return copyFileSync(this.downloadPath, join(this.extractedPath, binaryName));
+  }
+
+  async install() {
+    this.binPath = await this.registerBinary(binaryName);
+  }
+
+  async test() {
+    const program = 'console.log("42");';
+    const output = '42\nundefined';
+
+    assert.strictEqual(
+      (await execa(this.binPath, [], { input: program })).stdout,
+      output,
+    );
+  }
+}
+
+BoaInstaller.config = {
+  name: 'Boa',
+  id: 'boa',
+  supported: [
+    'linux-x64',
+    'win32-x64',
+    'darwin-x64',
+  ],
+};
+
+module.exports = BoaInstaller;