[texworks] Script: Assertion Failed - any limits to array size or anything?

[Paul A Norman]

Hi,

This is what it is all about, here are some reduced size images of the
dialogue.

The dialogue seeks to implement a number of features of the xcolor
package, and established colour names, in a point and click manner.

Additionally user defined colours can be directly inserted in a
document, user \definecolor colours can be set up, and there is a
level of persistence over dialogue sessions for colours 'mixed' by the
user.

I am looking at doing the tint tone and shades, and following the
"Names defined by xcolor" and 50% mixes set out by Dr. Uwe Kern, and
then this phase of  it should be ready.

Paul

On 13 June 2010 14:50, Paul A Norman <paul.a.norman at gmail.com> wrote:
> Thanks Jonathan and Stefan,
>
> I believe that is it Jonathan. I was looking at the routine's earlier
> array() space issue, but it appears to be at the end of the routine
> during string rebuilding from the message.
>
> Can Qt handle compression/decompression of .ui ? One .ui was getting
> quite big - they are after all just ginormous loose xml trees.
>
> So not finding any built in compression/decompression in Qt for .ui so
> far, I wanted to handle it in script - especially as I abosolutely
> need access to the .ui's xml tree in script any way.
>
> So I was using some LZW algorithm' as it is now public domain.
>
> On trials with various very large text portions it went quite well.
> Compressed and decompressed very nicely and the disk space savings are
> fantastic. A couple of minor UTF type issues, but nothing relevant to
> what I actually needed to do.
>
> But when I hit a 500k .ui that's when the fun started.
>
> So, yes there c/would be a very long string during the re-compoistion
> of "a" (one) string from array().join()
>
> Here is my test script. I've put it here in full for perusal / and any
> recommendations please.
>
> (A small other matter should TW.target.text be settable? You'll see
> what I am doing here.)
>
> //TeXworksScript
> //Title: LZW Compress / Decompress experiment
> //Description: Testing
> //Author: Paul A. Norman
> //Version: 0.3
> //Date: 2010-06-12
> //Script-Type: standalone
> //Context: TeXDocument
>
>
> // http://stackoverflow.com/questions/294297/javascript-implementation-of-gzip
> // http://jsolait.net/changeset/44/trunk
> //http://en.wikipedia.org/wiki/LZW
>
> // LZW-compress / decompress a string
>
>  switch( TW.question( null, "Compress / Decompress", "Compress?" ,(
> 0x00004000 | 0x00010000 ) ,0x00004000  ))
>     {
>      case 0x00004000:
>
>      TW.target.selectAll();
>      text = TW.target.text;
>      compressed = lzw_encode(text);
>      TW.target.insertText(compressed);
>
>      break
>
>      case 0x00010000:
>      TW.target.selectAll();
>      compressed = TW.target.text;
>      text = lzw_decode(compressed);
>      TW.target.insertText(text);
>      break;
>
>      default:
>      break;
>     }
>
> function lzw_encode(s) {
>    var dict = {};
>    var data = (s + "").split("");
>    var out = [];
>    var currChar;
>    var phrase = data[0];
>    var code = 256;
>    for (var i=1; i<data.length; i++) {
>        currChar=data[i];
>        if (dict[phrase + currChar] != null) {
>            phrase += currChar;
>        }
>        else {
>            out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
>            dict[phrase + currChar] = code;
>            code++;
>            phrase=currChar;
>        }
>    }
>    out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
>    for (var i=0; i<out.length; i++) {
>        out[i] = String.fromCharCode(out[i]);
>    }
>    return out.join("");
> }
>
> // Decompress an LZW-encoded string
> function lzw_decode(s) {
>    var dict = {};
>    var data = (s + "").split("");
>    var currChar = data[0];
>    var oldPhrase = currChar;
>    var out = [currChar];
>    var code = 256;
>    var phrase;
>    for (var i=1; i<data.length; i++) {
>        var currCode = data[i].charCodeAt(0);
>        if (currCode < 256) {
>            phrase = data[i];
>        }
>        else {
>           phrase = dict[currCode] ? dict[currCode] : (oldPhrase + currChar);
>        }
>        out.push(phrase);
>        currChar = phrase.charAt(0);
>        dict[code] = oldPhrase + currChar;
>        code++;
>        oldPhrase = phrase;
>    }
>    return out.join("");
> }
>
> On 13 June 2010 01:50, Jonathan Kew <jfkthame at googlemail.com> wrote:
>>
>> On 12 Jun 2010, at 12:36, Paul A Norman wrote:
>>
>>> Hi,
>>>
>>> Just checking, is there any limit to array size or anything  when
>>> using QtScript?
>>>
>>> I am getting the attached error message thrown up occasionally when
>>> using a lot of array space.
>>>
>>> Paul
>>> <assertionFailed.png>
>>
>> The error message is coming from inside the Qt libraries (from KDE, apparently), and relates to text rendering; my guess is that you've constructed an extremely long string (perhaps with no spaces/linebreaks?) and are trying to put it into the document where it'll get displayed. Perhaps you need to be adding line-breaks in between items in a list, or something like that.
>>
>> JK
>>
>>
>>
>
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