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up vote 4 down vote favorite

I'm looking for implementation of Java source code parser written in JavaScript language. Do you know any?

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2  
For what purpose? Interpreting the code and running it? Colorizing it in HTML? Mapping it into a JSON object? –  Jeff May 13 '11 at 14:57
2  
What exactly are you trying to do? –  Rocket Hazmat May 13 '11 at 14:58
    
@Jeff In the result I would like to have some kind of Abstract Syntax Tree. –  Eliah May 13 '11 at 15:03
    
@Rocket I'm interested in it for educational purpose. First of all I want to estimate modern JavaScript engines abilities in parsing language with strict type system. –  Eliah May 13 '11 at 15:10
1  
I don't think I've seen one. I've seen syntax highlighters, but never parsers. –  Rocket Hazmat May 13 '11 at 15:11

4 Answers 4

up vote 5 down vote accepted

Have a look at ANTLR which can have Javascript as a target, with the Java 1.5 grammar at http://www.antlr.org/grammar/1152141644268/Java.g

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Hm... Good idea! Thank you, Chris. But, I'm not sure that the performance of such parser would be enough for parsing large amounts of source codes. –  Eliah May 13 '11 at 15:38
    
ok. This is not the solution which I expected, but currently it is only solution which solves this problem. –  Eliah May 13 '11 at 16:47
up vote 2 down vote

I don't know of a Java parser per se, but here are some parser generators for Javascript:

If is one of these is ready for prime-time, you should be able to translate the grammar for Java into the requisite form and then use the PGS's to generate a Java parser in Javascript.

Of course, that will only give you a parser. If you want to do type analysis (as your comment seems to be saying), that's not what a parser does.

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Thank you for your reply, Stephen. I was working with some of these parser generators. I think its performance is not good enough for parsing large amounts of code with C++ like syntax(like Java), unfortunatelly. –  Eliah May 13 '11 at 15:25
    
@Eliah - it might seem counter-intuitive, but generated parsers tend to be faster than hand written parsers, especially if the PGS is mature. –  Stephen C May 13 '11 at 15:35
    
I noticed that ANTLR will also generate parsers in Javascript. –  Stephen C May 13 '11 at 16:10
up vote 0 down vote

Since you're question is tagged compilation I'm guessing a compile time answer is ok. GWT converts Java to Javascript, and using JSNI you should be able to generate native objects.

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Abdullah, thank you for your reply. GWT doesn't provide a way to parse or compile Java in the JavaScript environment. In fact it parses Java in the JRE and outputs compilation result before running the browser, i.e. browser doesn't parse Java sources itself. –  Eliah May 13 '11 at 15:32
    
Yeah I figured you wanted to have this runtime only (within the browser) but wasn't sure. –  Abdullah Jibaly May 13 '11 at 15:43
up vote -1 down vote

Try the Rhino engine?

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3  
The OP is looking for the other way around. –  Rocket Hazmat May 13 '11 at 15:01
4  
Rhino solves opposite problem: it parses JavaScript in Java environment. –  Eliah May 13 '11 at 15:11

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