Alhadis · July 15, 2023 06:51
diff --git a/.editorconfig b/.editorconfig
 root = true

 [*]
 charset = utf-8
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = false
 indent_style = tab

 [*.{yaml,yml}]
 indent_style = space
 indent_size = 4

 [{COMMIT_EDITMSG,MERGE_MSG}]
 trim_trailing_whitespace = true
 max_line_length = 72
 indent_style = space
 indent_size = 4
diff --git a/.gitattributes b/.gitattributes
 *.jsx linguist-language=JavaScript
 *.html linguist-documentation
diff --git a/.gitignore b/.gitignore
 .DS_Store
 Thumbs.db
 coverage
 Desktop.ini
 node_modules
 package-lock.json
 yarn.lock
 .nyc_output
 ._*
 .\#*
 \#*\#
 *~
 *.log
 [._]*.s[a-v][a-z]
 [._]*.sw[a-p]
 [._]s[a-v][a-z]
 [._]sw[a-p]
 /test.*
diff --git a/README.md b/README.md
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html lang="en-AU">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
 <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
 <meta name="viewport" content="initial-scale=1, minimum-scale=1"/>
 <title>js-engine-test.jsx</title>
 </head>

 <body>
 	<script type="text/javascript" src="./js-engine-test.jsx"></script>
 </body>
 </html>
diff --git a/js-engine-test.jsx b/js-engine-test.jsx
 /**
 * @fileoverview Report the ECMAScript version(s) supported by the JavaScript
 * engine running this script. Intended for use with ancient or obscure runtimes.
 *
 * NOTE: This file's `.jsx` extension is needed to be runnable in Adobe Illustrator
 * (and presumably other Adobe products that support so-called "ExtendScript" files).
 * It has nothing to do with Babel or its overhyped implementation of E4X.
 */

 /*@cc_on @if (@_jscript_version > 1 && @_jscript_version <= 11) @*/
 if("function" !== typeof alert && (
 	"function" === typeof print ||
 	"object" === typeof console && null !== console && "function" === typeof console.log
 )){
 	function alert(value){
 		if("object" === typeof console)
 			console.log(value);
 		else
 			print(value);
 	}
 }
 /*@end @*/

 function exec(js){
 	try{ return eval(js); }
 	catch(error){}
 }

 // Supposedly, ES3 engines can also be detected with `"function" === typeof /a/`.
 var supportsES3 = (function(){
 	var failures = 0;
 	var badWords = [
 		"abstract",
 		"boolean",
 		"byte",
 		"char",
 		"double",
 		"final",
 		"float",
 		"goto",
 		"int",
 		"long",
 		"native",
 		"short",
 		"synchronized",
 		"throws",
 		"transient",
 		"volatile",
 		"redHerring"
 	];
 	for(var i = 0; i < badWords.length; ++i){
 		try{ eval("var " + badWords[i] + " = true;"); }
 		catch(error){ ++failures; }
 	}
 	return failures === badWords.length - 1;
 })();
 var supportsES4 = false; // TODO: Find some way to run this script as ActionScript 3, lol
 var supportsES5 = exec("1 === ({ if: 1 }).if;");
 var supportsES6 = "function" === typeof (exec("let Foo = () => {}; Foo"));
 var supportsES2016 = 16 === exec("4 ** 2");
 var supportsES2017 = ("function" === typeof Promise) && exec("(async function(){ await Promise.resolve(true); })()") instanceof Promise;
 var supportsES2018 = exec("var X = {b: 2, c: 3}; var O = {a: 1, ...X}; O !== X && 6 === (O.a + O.b + O.c);");
 var supportsES2019 = exec("(function(){ try { throw new Error(); } catch { return true; } return false; })()");
 var supportsES2020 = 16 === exec("Number(null ?? 16n)");
 var supportsES2021 = exec("let a = 1; let i = 1; a ||= ++i; a === 1 && i === 1");
 var supportsES2022 = exec("class A{#x; static check(obj){ return #x in obj; }}; A.check(new A) && !A.check({});");
 var supportsES2023 = exec("(function(){ try{ return !eval('#!/usr/bin/env osascript -l JavaScript'); } catch(error){ return false; }})()");

 alert(
 	"Engine is limited to..."
 	+ "\n- ES3:    " + !!supportsES3
 	+ "\n- ES4:    " + !!supportsES4
 	+ "\n\nEngine supports..."
 	+ "\n- ES5:    " + !!supportsES5
 	+ "\n- ES6:    " + !!supportsES6
 	+ "\n- ES2016: " + !!supportsES2016
 	+ "\n- ES2017: " + !!supportsES2017
 	+ "\n- ES2018: " + !!supportsES2018
 	+ "\n- ES2019: " + !!supportsES2019
 	+ "\n- ES2020: " + !!supportsES2020
 	+ "\n- ES2021: " + !!supportsES2021
 	+ "\n- ES2022: " + !!supportsES2022
 	+ "\n- ES2023: " + !!supportsES2023
 );
diff --git a/LICENSE.md b/LICENSE.md
diff --git a/run-tests.sh b/run-tests.sh
 #!/usr/bin/env bash
 set -e

 output=\
 'Engine is limited to...
 - ES3:    false
 - ES4:    false

 Engine supports...
 - ES5:    true
 - ES6:    true
 - ES2016: true
 - ES2017: true
 - ES2018: true
 - ES2019: true
 - ES2020: true
 '

 test_cmd(){
 	set -- "$* ./js-engine-test.jsx"
 	printf '\033[2m$ %s\033[22m\n' "$1" >&2
 	printf %s "$output" | grep -v 'ES202[1-3]' | diff -U4 <($1 2>&1 | grep -v 'ES202[1-3]') -
 }

 test_cmd node
 test_cmd qjs --script
 test_cmd osascript -l JavaScript
 test_cmd spidermonkey
 test_cmd javascriptcore
 test_cmd jerry
 test_cmd d8

 gjs ./js-engine-test.jsx 2>& 1>/dev/null |
 grep -qE '^Gjs-Console-Message: [0-9]{2}:[0-9]{2}:[0-9]{2}\.\d{3}: Engine is limited to\.\.\.$'
	root = true

	[*]
	charset = utf-8
	end_of_line = lf
	insert_final_newline = true
	trim_trailing_whitespace = false
	indent_style = tab

	[*.{yaml,yml}]
	indent_style = space
	indent_size = 4

	[{COMMIT_EDITMSG,MERGE_MSG}]
	trim_trailing_whitespace = true
	max_line_length = 72
	indent_style = space
	indent_size = 4
	*.jsx linguist-language=JavaScript
	*.html linguist-documentation
	.DS_Store
	Thumbs.db
	coverage
	Desktop.ini
	node_modules
	package-lock.json
	yarn.lock
	.nyc_output
	._*
	.\#*
	\#*\#
	*~
	*.log
	[._]*.s[a-v][a-z]
	[._]*.sw[a-p]
	[._]s[a-v][a-z]
	[._]sw[a-p]
	/test.*
	<!DOCTYPE html>
	<html lang="en-AU">
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
	<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
	<meta name="viewport" content="initial-scale=1, minimum-scale=1"/>
	<title>js-engine-test.jsx</title>
	</head>

	<body>
	<script type="text/javascript" src="./js-engine-test.jsx"></script>
	</body>
	</html>
	/**
	* @fileoverview Report the ECMAScript version(s) supported by the JavaScript
	* engine running this script. Intended for use with ancient or obscure runtimes.
	*
	* NOTE: This file's `.jsx` extension is needed to be runnable in Adobe Illustrator
	* (and presumably other Adobe products that support so-called "ExtendScript" files).
	* It has nothing to do with Babel or its overhyped implementation of E4X.
	*/

	/@cc_on @if (@_jscript_version > 1 && @_jscript_version <= 11) @/
	if("function" !== typeof alert && (
	"function" === typeof print \|\|
	"object" === typeof console && null !== console && "function" === typeof console.log
	)){
	function alert(value){
	if("object" === typeof console)
	console.log(value);
	else
	print(value);
	}
	}
	/@end @/

	function exec(js){
	try{ return eval(js); }
	catch(error){}
	}

	// Supposedly, ES3 engines can also be detected with `"function" === typeof /a/`.
	var supportsES3 = (function(){
	var failures = 0;
	var badWords = [
	"abstract",
	"boolean",
	"byte",
	"char",
	"double",
	"final",
	"float",
	"goto",
	"int",
	"long",
	"native",
	"short",
	"synchronized",
	"throws",
	"transient",
	"volatile",
	"redHerring"
	];
	for(var i = 0; i < badWords.length; ++i){
	try{ eval("var " + badWords[i] + " = true;"); }
	catch(error){ ++failures; }
	}
	return failures === badWords.length - 1;
	})();
	var supportsES4 = false; // TODO: Find some way to run this script as ActionScript 3, lol
	var supportsES5 = exec("1 === ({ if: 1 }).if;");
	var supportsES6 = "function" === typeof (exec("let Foo = () => {}; Foo"));
	var supportsES2016 = 16 === exec("4 ** 2");
	var supportsES2017 = ("function" === typeof Promise) && exec("(async function(){ await Promise.resolve(true); })()") instanceof Promise;
	var supportsES2018 = exec("var X = {b: 2, c: 3}; var O = {a: 1, ...X}; O !== X && 6 === (O.a + O.b + O.c);");
	var supportsES2019 = exec("(function(){ try { throw new Error(); } catch { return true; } return false; })()");
	var supportsES2020 = 16 === exec("Number(null ?? 16n)");
	var supportsES2021 = exec("let a = 1; let i = 1; a \|\|= ++i; a === 1 && i === 1");
	var supportsES2022 = exec("class A{#x; static check(obj){ return #x in obj; }}; A.check(new A) && !A.check({});");
	var supportsES2023 = exec("(function(){ try{ return !eval('#!/usr/bin/env osascript -l JavaScript'); } catch(error){ return false; }})()");

	alert(
	"Engine is limited to..."
	+ "\n- ES3: " + !!supportsES3
	+ "\n- ES4: " + !!supportsES4
	+ "\n\nEngine supports..."
	+ "\n- ES5: " + !!supportsES5
	+ "\n- ES6: " + !!supportsES6
	+ "\n- ES2016: " + !!supportsES2016
	+ "\n- ES2017: " + !!supportsES2017
	+ "\n- ES2018: " + !!supportsES2018
	+ "\n- ES2019: " + !!supportsES2019
	+ "\n- ES2020: " + !!supportsES2020
	+ "\n- ES2021: " + !!supportsES2021
	+ "\n- ES2022: " + !!supportsES2022
	+ "\n- ES2023: " + !!supportsES2023
	);
	#!/usr/bin/env bash
	set -e

	output=\
	'Engine is limited to...
	- ES3: false
	- ES4: false

	Engine supports...
	- ES5: true
	- ES6: true
	- ES2016: true
	- ES2017: true
	- ES2018: true
	- ES2019: true
	- ES2020: true
	'

	test_cmd(){
	set -- "$* ./js-engine-test.jsx"
	printf '\033[2m$ %s\033[22m\n' "$1" >&2
	printf %s "$output" \| grep -v 'ES202[1-3]' \| diff -U4 <($1 2>&1 \| grep -v 'ES202[1-3]') -
	}

	test_cmd node
	test_cmd qjs --script
	test_cmd osascript -l JavaScript
	test_cmd spidermonkey
	test_cmd javascriptcore
	test_cmd jerry
	test_cmd d8

	gjs ./js-engine-test.jsx 2>& 1>/dev/null \|
	grep -qE '^Gjs-Console-Message: [0-9]{2}:[0-9]{2}:[0-9]{2}\.\d{3}: Engine is limited to\.\.\.$'