I just tried it out on some of my own code. looks great. here's what I found:
- If I already use "};" at the end of all my functions, the code will end up as "};;"
- The substition of variable names sounds great but where does it tell the browser
that $XX should point to. I use the window object to
attach much of my code to make it available and this was replaced with $10. I didn't
see any code that told the browser that $10 points
to the window object.
hope this helps a little.
"thomas@jet" wrote:
> Hi all.
>
> I am normally a lurker on this list cuz I like some of the topics raised here once
>in while dealing
> with more complex javascript concepts like memory handling, prototype techniques etc.
>
> Anyways, there was a thread here a while ago about compressing scripts for boosting
>download performance,
> and I thought some of you might be interested in checking out this tool I've put
>together for this purpose.
> The tool is JScript-class wrapped in a command line interface for use under WSH
>(Windows Scripting Host).
>
> Story:
> We are building a unihost ECMA scripting API overhere and we wanted to have the
>ability to create optimized
> script-packets out from various external javascript-classes depending on purpose.
>Kindof like a 'compilation' phase.
> Since there was no such tool available/good enough we made our own, namely ESC.
>(ECMAscript Cruncher).
>
> While at it, we decided to bring compression a step further than just to remove
>whitespace, so I added a
> 'variable-substitution' engine to kill off even more bytes. To describe this simple
>I'd better say obfuscation,
> eventhough this is only the bi-product of the result, the issue here is lesser
>chars. This mode is a bit tricky
> to get accustomed to at first, since it may crack your script. But once one
>understand how it operates, this
> thing really rocks cuz it'll save another 5-10% sizewise.(depending on the src)
>
> The ESC-class gives the opportunity to have a developer version of a
>module/class/script with really descriptional
> variable- names / method names, commented allover. This dev version of the script
>can at any point be 'compiled'
> to an optimized chunk for productional use.
>
> ESC has the ability to compress one or multiple external scripts and pack them
>together in a single file.
> There are four levels of compressions as of now whereas:
> 0 : none
> 1 : Empty line, single and Multiline comment removal. (with JScript conditional
>compilation awareness)
> 2 : Removal of whitespace ( string and regexp aware)
> 3 : Newline removal (with automatic 'often-forgotten-function-compound-seperator'
>(;) insertion)
> 4 : Enable variable substitution engine. (keyword, statement and window top-level
>prop/methods aware)
> !!! The var-subst engine can be used sepatately by using a special cmdline switch,
>so it can also be applied at crunch-level : 0.
>
> ESC needs Win32 with WSH 2.0 and JScript 5.5 installed to score, since it hevealy
>relies on new features
> in JScript 5.5's RegExp engine. If are running Win 98SE, ME or 2k with MSIE 5.5
>installed you should
> have the means to run ESC out of the box. Otherwize, the necessary upgrade of WSH /
>JScript package
> can be obtained from microsoft's (ca. 630 kB) (link provided in the readme file)
>
> --
> ok, enough blabbering, it's freeware so try it out if you like. (...and tell me if
>you have found another script-compressor
> that can handle a simple thing as 'return -1' :) )
> its for ECMAscript developers � la advanced, so I figure this list is a good place
>to point this tool to get it tested/evaluated ;)
> Any comments, problems, suggestions or bugreports are welcome.
> /thomas.
>
> Thomas Loo / Saltstorm.
> [EMAIL PROTECTED]
> ------------------------------------------------------
>
> ------------------------------------------------------------------------
> Name: esc-0.94.zip
> esc-0.94.zip Type: Zip Compressed Data (application/x-zip-compressed)
> Encoding: base64
--
Michael Pemberton
[EMAIL PROTECTED]
ICQ: 12107010
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