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Quinton Ashley 2021-09-23 23:26:42 -05:00
parent e9c4dd302e
commit e2ed130148
38 changed files with 150 additions and 148 deletions
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14
README.md
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@ -1,11 +1,17 @@
# Java to Javascript for QuintOS
I've built on top of the "Java to Javascript" transpiler by @wyattades and got inspiration from the JRE implementation in "java2javascript" by @BobHanson and others.
I've built on top of the "Java to Javascript" transpiler by @wyattades and got inspiration from the JavaDevelopmentKit implementation in "java2javascript" by @BobHanson and others.
The purpose of this project was to allow intro level CS students to write Java code but still use my QuintOS library which is web based instead of just having them run their programs in a Java console which is boring. I made a barebones JRE implementation in modern Javascript to acheive this.
The purpose of this project was to allow intro level CS students to write Java code but still use my QuintOS library which is web based instead of just having them run their programs in a Java console which is boring. I made a barebones JavaDevelopmentKit implementation in modern Javascript to acheive this.
## Known limitations
- casting to int requires putting the element being cast in parenthesis
- casting to int truncation workaround requires parenthesis around the number being cast
- no support for method overloading
- no support for method overloading, though a workaround could be made by making a function with the og name route to each of the variations of the overloaded function
- no support for private/public methods, though this could be done since they are included in modern JavaScript classes
## Contribute
I've only done a barebones implementation of Java 17 JDK, a lot is missing, so if you are interested in adding more please go for it and submit a pull request!

2
demo.html
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@ -31,7 +31,7 @@
<body>
<textarea id="javaFile" spellcheck="false" autocomplete="off" autocorrect="off" autocapitalize="off"></textarea>
<textarea id="javaConsole" spellcheck="false" autocomplete="off" autocorrect="off" autocapitalize="off"></textarea>
<script type="text/javascript" src="jre.js"></script>
<script type="text/javascript" src="jdk.js"></script>
<script type="text/javascript" src="ide.js"></script>
</body>
</html>

2
ide.js
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@ -5,5 +5,5 @@ ide.file0 = document.getElementById('javaFile');
ide.file0.onchange = () => {
ide.log.value = '';
let file = ide.file0.value;
jre.run(file);
jdk.run(file);
};

29
jre.js → jdk.js
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@ -1,3 +1,5 @@
// This is a bundle the JDK class code is the main part that
// I (quinton-ashley) made. That section starts on line 40.
(function () {
function r(e, n, t) {
function o(i, f) {
@ -38,9 +40,11 @@
function (require, module, exports) {
const log = console.log;
/* Java to JavaScript transpiler */
const java_to_javascript = require('java-to-javascript');
class JRE {
/* JDK implementation in modern JavaScript */
class JDK {
constructor() {
this.java = {};
let pkgs = ['com', 'lang', 'org', 'io', 'util'];
@ -49,6 +53,12 @@
}
this.imports = {};
/**
* The 'java.lang' package is imported automatically because this package
* provides classes that are fundamental to the Java programming language.
* Since classes like String already exist in JS, so I just extended them,
* no need to import.
*/
try {
let names = [
'Character',
@ -69,12 +79,15 @@
this.import(lang);
} catch (e) {}
// stub main for now
this.main = () => {};
this.load();
}
load() {
let ready = 0;
// load all imported classes
for (let className in this.imports) {
let imp = this.imports[className];
if (imp.classPath) {
@ -96,6 +109,8 @@
ready++;
}
}
// some classes may load slower than others,
// wait for them all before launching the Java program
if (ready != Object.keys(this.imports).length) {
let _this = this;
setTimeout(() => {
@ -116,7 +131,7 @@
System.in.reset();
System.out.reset();
this.main(this.vmArgs);
this.main(this.jvmArgs);
}
getClass(classPath) {
@ -149,7 +164,7 @@
imp.load = null;
imp.classPath = className.split('.');
let src = './jre';
let src = './jdk';
for (let part of imp.classPath) {
src += '/' + part;
}
@ -190,14 +205,14 @@
let userName = window?.QuintOS?.userName || 'quinton-ashley';
let className = file.slice(classLine + 13, file.indexOf(' {', classLine + 13));
let prefix = `(jre.imports['com.${userName}.${className}'] = {}).load = () => {\n\n`;
let prefix = `(jdk.imports['com.${userName}.${className}'] = {}).load = () => {\n\n`;
// handle Java class imports
for (let i = 0; i < imports.length; i++) {
let imp = imports[i];
let impPath = imp.split('.');
let impName = impPath[impPath.length - 1];
prefix += `let ${impName} = jre.import('${imp}');\n`;
prefix += `let ${impName} = jdk.import('${imp}');\n`;
}
prefix += '\n';
@ -219,7 +234,7 @@
// log(file);
let suffix = `\njre.main = ${className}.main;\n}`;
let suffix = `\njdk.main = ${className}.main;\n}`;
window.file0 = file;
@ -242,7 +257,7 @@
}
}
}
window.jre = new JRE();
window.jdk = new JDK();
},
{
'java-to-javascript': 2

7
jre/java/io/File.js → jdk/java/io/File.js
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@ -1,5 +1,4 @@
jre.imports['java.io.File'].load = () => {
jdk.imports['java.io.File'].load = () => {
class File {
constructor(file) {
this.absPath = file;
@ -10,5 +9,5 @@ jre.imports['java.io.File'].load = () => {
}
File.seperator = File.seperatorChar = '/';
File.pathSeparator = File.pathSeparatorChar = '/';
jre.java.io.File = File;
}
jdk.java.io.File = File;
};

4
jre/java/io/InputStream.js → jdk/java/io/InputStream.js
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@ -1,4 +1,4 @@
jre.imports['java.io.InputStream'].load = () => {
jdk.imports['java.io.InputStream'].load = () => {
class InputStream {
constructor() {
this.reset();
@ -17,5 +17,5 @@ jre.imports['java.io.InputStream'].load = () => {
this.mark += length;
}
}
jre.java.io.InputStream = InputStream;
jdk.java.io.InputStream = InputStream;
};

4
jre/java/io/PrintStream.js → jdk/java/io/PrintStream.js
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@ -1,4 +1,4 @@
jre.imports['java.io.PrintStream'].load = () => {
jdk.imports['java.io.PrintStream'].load = () => {
class PrintStream {
constructor() {
this.log = '';
@ -40,5 +40,5 @@ jre.imports['java.io.PrintStream'].load = () => {
}
}
}
jre.java.io.PrintStream = PrintStream;
jdk.java.io.PrintStream = PrintStream;
};

0
jre/java/lang/Boolean.js → jdk/java/lang/Boolean.js
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0
jre/java/lang/Byte.js → jdk/java/lang/Byte.js
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4
jre/java/lang/Character.js → jdk/java/lang/Character.js
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@ -1,4 +1,4 @@
jre.imports['java.lang.Character'].load = () => {
jdk.imports['java.lang.Character'].load = () => {
class Character {}
Character.isDigit = (c) => {
c = c.charCodeAt(0);
@ -27,5 +27,5 @@ jre.imports['java.lang.Character'].load = () => {
Character.toString = (c) => {
return c;
};
jre.java.lang.Character = Character;
jdk.java.lang.Character = Character;
};

13
jre/java/lang/Double.js → jdk/java/lang/Double.js
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@ -1,19 +1,18 @@
jre.imports['java.lang.Double'].load = () => {
jdk.imports['java.lang.Double'].load = () => {
class Double {
constructor() {
throw "new Double() not supported";
throw 'new Double() not supported';
}
}
Double.parseDouble = (d) => {
return parseFloat(d);
}
};
Double.compare = (a, b) => {
return a - b;
}
};
Double.MAX_VALUE = Number.MAX_VALUE;
Double.POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
Double.NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY;
Double.NaN = NaN;
jre.java.lang.Double = Double;
}
jdk.java.lang.Double = Double;
};

0
jre/java/lang/Exception.js → jdk/java/lang/Exception.js
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11
jre/java/lang/Float.js → jdk/java/lang/Float.js
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@ -1,15 +1,14 @@
jre.imports['java.lang.Float'].load = () => {
jdk.imports['java.lang.Float'].load = () => {
class Float {}
Float.parseFloat = (d) => {
return parseFloat(d);
}
};
Float.compare = (a, b) => {
return a - b;
}
};
Float.MAX_VALUE = Number.MAX_VALUE;
Float.POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
Float.NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY;
Float.NaN = NaN;
jre.java.lang.Float = Float;
}
jdk.java.lang.Float = Float;
};

11
jre/java/lang/Integer.js → jdk/java/lang/Integer.js
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@ -1,15 +1,14 @@
jre.imports['java.lang.Integer'].load = () => {
jdk.imports['java.lang.Integer'].load = () => {
class Integer {}
Integer.parseInt = (d) => {
return parseInt(d);
}
};
Integer.compare = (a, b) => {
return a - b;
}
};
Integer.MAX_VALUE = Number.MAX_VALUE;
Integer.POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
Integer.NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY;
Integer.NaN = NaN;
jre.java.lang.Integer = Integer;
}
jdk.java.lang.Integer = Integer;
};

11
jre/java/lang/Long.js → jdk/java/lang/Long.js
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@ -1,15 +1,14 @@
jre.imports['java.lang.Long'].load = () => {
jdk.imports['java.lang.Long'].load = () => {
class Long {}
Long.parseLong = (d) => {
return parseInt(d);
}
};
Long.compare = (a, b) => {
return a - b;
}
};
Long.MAX_VALUE = Number.MAX_VALUE;
Long.POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
Long.NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY;
Long.NaN = NaN;
jre.java.lang.Long = Long;
}
jdk.java.lang.Long = Long;
};

11
jre/java/lang/Short.js → jdk/java/lang/Short.js
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@ -1,15 +1,14 @@
jre.imports['java.lang.Short'].load = () => {
jdk.imports['java.lang.Short'].load = () => {
class Short {}
Short.parseShort = (d) => {
return parseInt(d);
}
};
Short.compare = (a, b) => {
return a - b;
}
};
Short.MAX_VALUE = Number.MAX_VALUE;
Short.POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
Short.NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY;
Short.NaN = NaN;
jre.java.lang.Short = Short;
}
jdk.java.lang.Short = Short;
};

14
jre/java/lang/String.js → jdk/java/lang/String.js
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@ -1,4 +1,4 @@
jre.imports['java.lang.String'].load = () => {};
jdk.imports['java.lang.String'].load = () => {};
// String is special, I just extended js String prototype
String.prototype.hashCode = () => {
let h = this._hashCode;
@ -10,15 +10,15 @@ String.prototype.hashCode = () => {
this._hashCode = h;
}
return h;
}
};
String.prototype.isEmpty = () => {
return this.length == 0
}
return this.length == 0;
};
String.prototype.contains = (substr) => {
return this.includes(substr);
}
};
// static methods
String.valueOf = (c) => {
return c.toString();
}
jre.java.lang.String = String;
};
jdk.java.lang.String = String;

9
jre/java/lang/StringBuilder.js → jdk/java/lang/StringBuilder.js
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@ -1,8 +1,7 @@
jre.imports['java.lang.StringBuilder'].load = () => {
jdk.imports['java.lang.StringBuilder'].load = () => {
class StringBuilder {
constructor() {
this._str = "";
this._str = '';
}
append(val) {
this._str = this._str + val;
@ -16,5 +15,5 @@ jre.imports['java.lang.StringBuilder'].load = () => {
return this._str;
}
}
jre.java.lang.StringBuilder = StringBuilder;
}
jdk.java.lang.StringBuilder = StringBuilder;
};

10
jre/java/lang/System.js → jdk/java/lang/System.js
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@ -1,7 +1,7 @@
jre.imports['java.lang.System'].load = () => {
const Formatter = jre.import('java.util.Formatter');
const InputStream = jre.import('java.io.InputStream');
const PrintStream = jre.import('java.io.PrintStream');
jdk.imports['java.lang.System'].load = () => {
const Formatter = jdk.import('java.util.Formatter');
const InputStream = jdk.import('java.io.InputStream');
const PrintStream = jdk.import('java.io.PrintStream');
class System {}
@ -31,5 +31,5 @@ jre.imports['java.lang.System'].load = () => {
console.log('Exited with code: ' + code);
if (window?.exit) exit();
};
jre.java.lang.System = System;
jdk.java.lang.System = System;
};

8
jdk/java/lang/Thread.js Executable file
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@ -0,0 +1,8 @@
jdk.imports['java.lang.Thread'].load = () => {
class Thread {
async sleep(millis) {
await setTimeout(millis);
}
}
jdk.java.lang.Thread = Thread;
};

0
jre/java/lang/Throwable.js → jdk/java/lang/Throwable.js
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9
jre/java/util/AbstractList.js → jdk/java/util/AbstractList.js
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@ -1,6 +1,5 @@
jre.imports['java.util.AbstractList'].load = () => {
const Itr = jre.import('java.util.Itr');
jdk.imports['java.util.AbstractList'].load = () => {
const Itr = jdk.import('java.util.Itr');
class AbstractList {
constructor() {
@ -83,5 +82,5 @@ jre.imports['java.util.AbstractList'].load = () => {
return new Itr(this);
}
}
jre.java.util.AbstractList = AbstractList;
}
jdk.java.util.AbstractList = AbstractList;
};

10
jdk/java/util/ArrayList.js Executable file
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@ -0,0 +1,10 @@
jdk.imports['java.util.ArrayList'].load = () => {
let AbstractList = jdk.import('java.util.AbstractList');
class ArrayList extends AbstractList {
constructor(...args) {
super(args);
}
}
jdk.java.util.ArrayList = ArrayList;
};

9
jre/java/util/Arrays.js → jdk/java/util/Arrays.js
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@ -1,5 +1,4 @@
jre.imports['java.util.Arrays'].load = () => {
jdk.imports['java.util.Arrays'].load = () => {
class Arrays {
fill(data, begin, nbElem, param) {
const max = begin + nbElem;
@ -9,9 +8,9 @@ jre.imports['java.util.Arrays'].load = () => {
}
copyOf(original, newLength, ignore) {
const copy = new Array(newLength);
jre.java.lang.System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
jdk.java.lang.System.arraycopy(original, 0, copy, 0, Math.min(original.length, newLength));
return copy;
}
}
jre.java.util.Arrays = Arrays;
}
jdk.java.util.Arrays = Arrays;
};

7
jre/java/util/Collections.js → jdk/java/util/Collections.js
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@ -1,5 +1,4 @@
jre.imports['java.util.Collections'].load = () => {
jdk.imports['java.util.Collections'].load = () => {
class Collections {
sort(list) {
if (!list.size()) return;
@ -14,5 +13,5 @@ jre.imports['java.util.Collections'].load = () => {
l.set(i, l.set(j, l.get(i)));
}
}
jre.java.util.Collections = Collections;
}
jdk.java.util.Collections = Collections;
};

7
jre/java/util/Formatter.js → jdk/java/util/Formatter.js
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@ -1,6 +1,5 @@
jre.imports['java.util.Formatter'].load = () => {
const IllegalFormatException = jre.import('java.util.IllegalFormatException');
jdk.imports['java.util.Formatter'].load = () => {
const IllegalFormatException = jdk.import('java.util.IllegalFormatException');
class Formatter {
format(format, ...args) {
@ -14,5 +13,5 @@ jre.imports['java.util.Formatter'].load = () => {
return format;
}
}
jre.java.util.Formatter = Formatter;
jdk.java.util.Formatter = Formatter;
};

7
jre/java/util/HashMap.js → jdk/java/util/HashMap.js
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@ -1,5 +1,4 @@
jre.imports['java.util.HashMap'].load = () => {
jdk.imports['java.util.HashMap'].load = () => {
class HashMap {
constructor() {
this.content = {};
@ -57,5 +56,5 @@ jre.imports['java.util.HashMap'].load = () => {
return Object.keys(this.content).length;
}
}
jre.java.util.HashMap = HashMap;
}
jdk.java.util.HashMap = HashMap;
};

9
jre/java/util/HashSet.js → jdk/java/util/HashSet.js
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@ -1,5 +1,4 @@
jre.imports['java.util.HashSet'].load = () => {
jdk.imports['java.util.HashSet'].load = () => {
class HashSet {
constructor() {
this.content = {};
@ -52,7 +51,7 @@ jre.imports['java.util.HashSet'].load = () => {
toArray(a) {
const _this = this;
return Object.keys(this.content).map(key => _this.content[key]);
return Object.keys(this.content).map((key) => _this.content[key]);
}
iterator() {
@ -69,5 +68,5 @@ jre.imports['java.util.HashSet'].load = () => {
return this.content[index];
}
}
jre.java.util.HashSet = HashSet;
}
jdk.java.util.HashSet = HashSet;
};

5
jre/java/util/IllegalFormatException.js → jdk/java/util/IllegalFormatException.js
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@ -1,5 +1,4 @@
jre.imports['java.util.IllegalFormatException'].load = () => {
jdk.imports['java.util.IllegalFormatException'].load = () => {
// TODO import and extend exception
class IllegalFormatException {
@ -7,5 +6,5 @@ jre.imports['java.util.IllegalFormatException'].load = () => {
this.message = message;
}
}
jre.java.util.IllegalFormatException = IllegalFormatException;
jdk.java.util.IllegalFormatException = IllegalFormatException;
};

9
jre/java/util/Itr.js → jdk/java/util/Itr.js
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@ -1,5 +1,4 @@
jre.imports['java.util.Itr'].load = () => {
jdk.imports['java.util.Itr'].load = () => {
class Itr {
constructor(list) {
this.cursor = 0;
@ -21,12 +20,12 @@ jre.imports['java.util.Itr'].load = () => {
} catch ($ex$) {
if ($ex$ instanceof Error) {
const e = $ex$;
throw new Error("no such element exception");
throw new Error('no such element exception');
} else {
throw $ex$;
}
}
}
}
jre.java.util.Itr = Itr;
}
jdk.java.util.Itr = Itr;
};

10
jdk/java/util/LinkedList.js Executable file
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@ -0,0 +1,10 @@
jdk.imports['java.util.LinkedList'].load = () => {
let AbstractList = jdk.import('java.util.AbstractList');
class LinkedList extends AbstractList {
constructor(...args) {
super(args);
}
}
jdk.java.util.LinkedList = LinkedList;
};

7
jre/java/util/Random.js → jdk/java/util/Random.js
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@ -1,5 +1,4 @@
jre.imports['java.util.Random'].load = () => {
jdk.imports['java.util.Random'].load = () => {
class Random {
constructor() {
this.seed = undefined;
@ -44,5 +43,5 @@ jre.imports['java.util.Random'].load = () => {
return min + rnd * (max - min);
}
}
jre.java.util.Random = Random;
}
jdk.java.util.Random = Random;
};

6
jre/java/util/Scanner.js → jdk/java/util/Scanner.js
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@ -1,5 +1,5 @@
jre.imports['java.util.Scanner'].load = () => {
const File = jre.import('java.io.File');
jdk.imports['java.util.Scanner'].load = () => {
const File = jdk.import('java.io.File');
class Scanner {
constructor(input) {
@ -50,5 +50,5 @@ jre.imports['java.util.Scanner'].load = () => {
}
close() {}
}
jre.java.util.Scanner = Scanner;
jdk.java.util.Scanner = Scanner;
};

6
jre/java/util/Stack.js → jdk/java/util/Stack.js
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@ -1,4 +1,4 @@
jre.imports['java.util.Stack'].load = () => {
jdk.imports['java.util.Stack'].load = () => {
class Stack {
constructor() {
this.content = new Array();
@ -20,5 +20,5 @@ jre.imports['java.util.Stack'].load = () => {
return this.content.slice(-1)[0];
}
}
jre.java.util.Stack = Stack;
}
jdk.java.util.Stack = Stack;
};

9
jre/java/lang/Thread.js
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@ -1,9 +0,0 @@
jre.imports['java.lang.Thread'].load = () => {
class Thread {
async sleep(millis) {
await setTimeout(millis);
}
}
jre.java.lang.Thread = Thread;
}

11
jre/java/util/ArrayList.js
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@ -1,11 +0,0 @@
jre.imports['java.util.ArrayList'].load = () => {
let AbstractList = jre.import('java.util.AbstractList');
class ArrayList extends AbstractList {
constructor(...args) {
super(args);
}
}
jre.java.util.ArrayList = ArrayList;
}

11
jre/java/util/LinkedList.js
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@ -1,11 +0,0 @@
jre.imports['java.util.LinkedList'].load = () => {
let AbstractList = jre.import('java.util.AbstractList');
class LinkedList extends AbstractList {
constructor(...args) {
super(args);
}
}
jre.java.util.LinkedList = LinkedList;
}

2
package.json
View File

@ -1,6 +1,6 @@
{
"name": "java2js",
"version": "1.0.2",
"version": "1.0.3",
"description": "Converts Java to JavaScript with support for p5.js and QuintOS.",
"main": "java2js.js",
"scripts": {