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Java class to javascript class

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Convert Java Classes to ES6 Classes

wyattades/java-to-javascript

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README.md

Convert Java Classes to ES6 Classes.

Translates: classes, methods, variables, statics, and more!

(Originally created for converting Processing to p5.js)

class MyClass < int x = 42; static String y = "Life"; MyClass(String secret) < final String result = MyClass.y + secret + x; if (result != null) < purpose(); > > >
class MyClass  constructor(secret)  this.x = 42; const result = MyClass.y + secret + this.x; if (result !== null)  purpose(); > > > MyClass.y = 'Life';
$ npm install java-to-javascript
script src pl-s">https://unpkg.com/java-to-javascript@latest/build/java-to-javascript.min.js">script>

Note: You can replace latest with the library’s version you want to use, e.g. v0.1.10 . The library will be exposed on the global window scope as javaToJavascript .

Module API (For Node and the browser)

javaToJavascript(javaString, options?, progress?)

Returns: string — — Converted JavaScript

// Node module: var javaToJavascript = require('java-to-javascript'); // Browser script: var javaToJavascript = window.javaToJavascript; var jsString = javaToJavascript( /* params */ );
Param Type Description
javaString string Java file contents
[options] object
[options.globalVars] object Object keys are added to the globalScope object. If the value is a string, the variable is renamed to that string
[options.globalScope] string If specified, variables in globalVars are appended to globalScope object
[options.p5] boolean Sets globalScope to ‘p5’ , adds p5 variable mappings to globalVars , and allows for global methods and variables
[options.ugly] boolean Don’t beautify JavaScript code
[progress] function Callback on progress of conversion. Args are progress value (0.0 to 1.0), and a message string 
Usage: java-to-javascript [options] Options: -V, --version output the version number -o, --output Specifies the output filename. (Default is the input filename with a .js extension) -s, --scope If specified, variables in `globals` are appended to `scope` object -g, --globals JSON or JavaScript file containing a global variable mapping. See README --p5 Sets `scope` to "p5", adds p5 variable mappings to `globals`, and allows for global methods and variables --ugly Don't beautify JavaScript code -h, --help output usage information
  • Parse Java code to create an AST (abstract syntax tree)
  • Replace global variables that the user specifies
  • Generate JavaScript code from the AST
  • Beautify JavaScript

I’ve included some Java Class (partial) polyfills in polyfills.js that help in the conversion of Java to JS.

Included Polyfills: List (alias ArrayList ), Map (alias HashMap )

  • Local variables or method parameters with the same name as a variable in their class will incorrectly be assigned to the this object. Example Input Java:
class Thing < int x, y; myMethod(int x) < int y = 20; this.x = x + y; > >
class Thing  myMethod(x)  let y = 20; this.x = this.x + this.y; > >
/* I don't know the exact cause, but here's what I have found: */ ((testFunc())); // Normal (((testFunc()))); // Long parse time ((((testFunc())))); // Infinitely hangs
  • Nested classes aka anonymous classes
  • Synchronized methods and statements
  • Interfaces and abstract classes
  • Enums
  • Packages and imports

This is a work in progress! Not all Java features are supported, and some are too difficult to translate to JS, so make sure to doublecheck the resulting code (Also, it assumes you are passing in valid Java).

Источник

Java class to javascript class

Convert Java Classes to ES6 Classes.

Translates: classes, methods, variables, statics, and more!

(Originally created for converting Processing to p5.js)

class MyClass 
 int x = 42;
 static String y = "Life";
 
 MyClass(String secret) 
 final String result = MyClass.y + secret + x;
 if (result != null) 
 purpose();
 >
 >
>
class MyClass 
 constructor(secret) 
 this.x = 42;
 
 const result = MyClass.y + secret + this.x;
 if (result !== null) 
 purpose();
 >
 >
>
MyClass.y = 'Life';
$ npm install java-to-javascript
script src="https://unpkg.com/java-to-javascript@latest/build/java-to-javascript.min.js">/script>

Note: You can replace latest with the library’s version you want to use, e.g. v0.1.10 . The library will be exposed on the global window scope as javaToJavascript .

Module API (For Node and the browser)

javaToJavascript(javaString, options?, progress?)

Returns: string — — Converted JavaScript

// Node module:
var javaToJavascript = require('java-to-javascript');
// Browser script:
var javaToJavascript = window.javaToJavascript;
 
var jsString = javaToJavascript( /* params */ );
Param Type Description
javaString string Java file contents
[options] object
[options.globalVars] object Object keys are added to the globalScope object. If the value is a string, the variable is renamed to that string
[options.globalScope] string If specified, variables in globalVars are appended to globalScope object
[options.p5] boolean Sets globalScope to ‘p5’ , adds p5 variable mappings to globalVars , and allows for global methods and variables
[options.ugly] boolean Don’t beautify JavaScript code
[progress] function Callback on progress of conversion. Args are progress value (0.0 to 1.0), and a message string 
Usage: java-to-javascript [options] Options: -V, --version output the version number -o, --output Specifies the output filename. (Default is the input filename with a .js extension) -s, --scope If specified, variables in `globals` are appended to `scope` object -g, --globals JSON or JavaScript file containing a global variable mapping. See README --p5 Sets `scope` to "p5", adds p5 variable mappings to `globals`, and allows for global methods and variables --ugly Don't beautify JavaScript code -h, --help output usage information
  • Parse Java code to create an AST (abstract syntax tree)
  • Replace global variables that the user specifies
  • Generate JavaScript code from the AST
  • Beautify JavaScript

I’ve included some Java Class (partial) polyfills in polyfills.js that help in the conversion of Java to JS.

Included Polyfills: List (alias ArrayList ), Map (alias HashMap )

  • Local variables or method parameters with the same name as a variable in their class will incorrectly be assigned to the this object. Example Input Java:
class Thing 
 int x, y;
 myMethod(int x) 
 int y = 20;
 this.x = x + y;
 >
>
class Thing 
 myMethod(x) 
 let y = 20;
 this.x = this.x + this.y;
 >
>
/* I don't know the exact cause, but here's what I have found: */
((testFunc())); // Normal 
(((testFunc()))); // Long parse time 
((((testFunc())))); // Infinitely hangs
  • Nested classes aka anonymous classes
  • Synchronized methods and statements
  • Interfaces and abstract classes
  • Enums
  • Packages and imports

This is a work in progress! Not all Java features are supported, and some are too difficult to translate to JS, so make sure to doublecheck the resulting code (Also, it assumes you are passing in valid Java).

  • Java lexical parser: Github user mazko (https://github.com/mazko/jsjavaparser/blob/master/src/Java.1.7.pegjs)
  • Lexical Parser -> JS: peg.js

Источник

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