JSC (Java Script Compressor)

2006/05/16 Kazuki Ohta

Introduction

A JavaScript Compressor, which reduces the code size of JavaScript sources. The aim is to lower the latency to load a profile of javascript library files. NOTICE, this software is still in the beta stage.

Features

Parsing & Lexing JS code and output the small code which behaves as same as the original code.
- remove needless spaces
- remove needless newlines

Download

This software is distributed under the terms of 'LGPL', because internally this software uses KDE's kjs code (parser & lexer).
Source
- jsc-0.1.0.tar.gz

Install

Requirements
- C++ Compiler (gcc-3.x or higher is recommendded)
How to make
```
$ ./configure
$ make
      
```

Usage

ubuntu% ./jsc prototype-1.4.0.js > tmp2
ubuntu% ./jsc tmp2 > tmp3              
ubuntu% diff -u tmp2 tmp3

If diff doesn't output anything, the code compressing ends successfully. You must check this. If there's a difference between tmp2 and tmp3, that's a bug of jsc. So please report to me.

Example

ubuntu% ./jsc prototype-1.4.0.js > prototype-compressed-1.4.0.js
ubuntu% ls -al prototype-1.4.0.js 
-rw-------  1 kzk kzk 47445 2006-01-21 05:09 prototype-1.4.0.js
ubuntu% ls -al prototype-compressed-1.4.0.js 
-rw-------  1 kzk kzk 34987 2006-05-16 10:50 prototype-compressed-1.4.0.js
ubuntu% ls -al prototype-1.4.0.js.gz           
-rw-------  1 kzk kzk 10543 2006-01-21 05:09 prototype-1.4.0.js.gz
ubuntu% ls -al prototype-compressed-1.4.0.js.gz 
-rw-------  1 kzk kzk 8544 2006-05-16 11:16 prototype-compressed-1.4.0.js.gz

Future Plans

Rename identifiers to more shorter name
Some code optimizations

inline function expantion
threaded code
or any other techniques?

History

2006/05/16

initial release (version 0.1.0)

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