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Re: Re: question on random numbers for browser XSLT
Subject: Re: Re: question on random numbers for browser XSLT
From: Hermann Stamm-Wilbrandt <STAMMW@xxxxxxxxxx>
Date: Sat, 25 Jul 2009 11:05:17 +0200
|
 > Or, for XSLT 1.0 one could write the following (knowing that the
> values contain only uppercase latin characters or digits):
You cannot assume that in general. Here is what IDs get generated
for different browser/OS when clicking on this link:
http://www.stamm-wilbrandt.de/en/xsl-list/random/scott.xml
Linux:
id0x098f7528 Firefox 3.0.10
o770813095 Opera 9.64
IDACI52B Internet Explorer 6.0.2800 (ies4linux)
Windows:
id0x0b563640 Firefox 3.0.12
IDACAYFC Internet Explorer 6.0.2900
o5002021 Opera 9.63
id2010145 Safari 4.0.2
id205096 Chrome 2.0.172
$ cat scott.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="scott.xsl"?>)
<tag/>
$ cat scott.xsl
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:exsl="http://exslt.org/common"
xmlns:msxsl="urn:schemas-microsoft-com:xslt"
exclude-result-prefixes="exsl msxsl"
>
<xsl:output method="html" encoding="UTF-8" />
<msxsl:script language="JScript" implements-prefix="exsl">
this['node-set'] = function (x) {
return x;
}
</msxsl:script>
<xsl:template match="/">
<html>
<body>
<xsl:variable name="seed"><a/></xsl:variable>
<xsl:value-of select="generate-id(exsl:node-set($seed))" />
</body>
</html>
</xsl:template>
</xsl:stylesheet>
Mit besten Gr|_en / Best wishes,
Hermann Stamm-Wilbrandt
Developer, XML Compiler
WebSphere DataPower SOA Appliances
----------------------------------------------------------------------
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Martin Jetter
Geschdftsf|hrung: Erich Baier
Sitz der Gesellschaft: Bvblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
Dimitre Novatchev
<dnovatchev@gmail
.com> To
xsl-list@xxxxxxxxxxxxxxxxxxxxxx
07/25/2009 01:51 cc
AM
Subject
Re: Re: question on random
Please respond to numbers for browser XSLT
xsl-list@xxxxxxxx
lberrytech.com
Or, for XSLT 1.0 one could write the following (knowing that the
values contain only uppercase latin characters or digits):
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:testmap="testmap"
exclude-result-prefixes="xsl testmap"
>
<xsl:import href="str-dvc-map.xsl"/>
<!-- to be applied on any xml source -->
<testmap:testmap/>
<xsl:output method="text"/>
<xsl:variable name="vChars" select=
"'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'"
/>
<xsl:template match="/">
<xsl:variable name="vTestMap" select="document('')/*/testmap:*[1]"/>
<xsl:variable name="vNumericVal">
<xsl:call-template name="str-map">
<xsl:with-param name="pFun" select="$vTestMap"/>
<xsl:with-param name="pStr" select="'IDACQ0LB'"/>
</xsl:call-template>
</xsl:variable>
<xsl:value-of select="$vNumericVal mod 65536"/>
</xsl:template>
<xsl:template name="double" match="testmap:*">
<xsl:param name="arg1"/>
<xsl:value-of select="string-length(substring-before
($vChars,$arg1))"/>
</xsl:template>
</xsl:stylesheet>
--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
On Fri, Jul 24, 2009 at 4:06 PM, Dimitre Novatchev<dnovatchev@xxxxxxxxx>
wrote:
> Hermann,
>
>> Now these values look different for different browsers, and need to
>> "somehow"
>> be converted to a seed value for FXSLs random generator.
>>
>> Ideas?
>
>
> You could try something simple as the following:
>
> sum(string-to-codepoints($pId)) mod 65536
>
>
> and see that the results' variety is satisfactory.
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> You've achieved success in your field when you don't know whether what
> you're doing is work or play
>
>
>
>
> On Fri, Jul 24, 2009 at 3:28 PM, Hermann
> Stamm-Wilbrandt<STAMMW@xxxxxxxxxx> wrote:
>> Dimitre,
>>
>>> > If you have decided to go with a service providing random numbers
then
>>> > xslt-ish way (set based) to do it would be a service receiving a
number
>> and
>>> > returning an xml with a specified number of random numbers.
>>> >
>>>
>>> Using a service to provide a random sequence is much more unreliable
>>> and inefficient than just doing this in pure XSLT, as this has been
>>> done by FXSL for many years:
>>>
>>>
>>
http://fxsl.sourceforge.net/articles/Random/Casting%20the%20Dice%20with%20FXS
L-htm.htm
>>
>> first of all, FXSL is a cool library and the documentation at the link
is
>> informative.
>>
>> I tried fxsl-1.2 and installed these necessary files on my webserver:
>> curry.xsl iter.xsl map.xsl random.xsl test-random.xsl
>>
>> First I realized that it did work on FF3 and not on FF2 (because of the
>> missing
>> support of exslt:node-set there). Then I tried it on IE6 and it did not
>> work first.
>> After applying below patch it worked under IE6, too.
>> You may try it out here:
>>
http://www.stamm-wilbrandt.de/en/xsl-list/random/fxsl-1.2/test-random.xml
>>
>> The output is the same as generated by eg. "xsltproc test-random.xsl
>> some.xml", but
>> it is ALWAYS THE SAME output (try it repeatedly).
>>
>> I knew of the different techniques in generating pseudo random numbers
but
>> what
>> is really needed is to be able to provide a changing seed (eg.
initialize
>> with
>> the number of seconds since 1/1/1970, time(NULL) in C).
>>
>> Then I remembered the generate-id use of Scott, and after reading
Michaels
>> last
>> post the following fragment seems to be an always changing value:
>> http://www.stamm-wilbrandt.de/en/xsl-list/random/scott.xml
>>
>> <xsl:variable name="seed"><a/></xsl:variable>
>> <xsl:value-of select="generate-id(exsl:node-set($seed))" />
>>
>> Now these values look different for different browsers, and need to
>> "somehow"
>> be converted to a seed value for FXSLs random generator.
>>
>> Ideas?
>>
>>
>>
=============================================================================
>> from "
http://dpcarlisle.blogspot.com/2007/05/exslt-node-set-function.html"
>> $ diff random.xsl.orig random.xsl
>> 20c20,21
>> < exclude-result-prefixes="xsl ext randScale myRandNext
>> mySingleRandDistFun x"
>> ---
>>> xmlns:msxsl="urn:schemas-microsoft-com:xslt"
>>> exclude-result-prefixes="xsl ext msxsl randScale myRandNext
>> mySingleRandDistFun x".
>> 30a32,36
>>> <msxsl:script language="JScript" implements-prefix="ext">
>>> this['node-set'] = function (x) {
>>> return x;
>>> }
>>> </msxsl:script>
>> $
>>
>>
>>
>> Mit besten Gr|_en / Best wishes,
>>
>> Hermann Stamm-Wilbrandt
>> Developer, XML Compiler
>> WebSphere DataPower SOA Appliances
>> ----------------------------------------------------------------------
>> IBM Deutschland Research & Development GmbH
>> Vorsitzender des Aufsichtsrats: Martin Jetter
>> Geschdftsf|hrung: Erich Baier
>> Sitz der Gesellschaft: Bvblingen
>> Registergericht: Amtsgericht Stuttgart, HRB 243294
>>
>>
>>
>> Dimitre Novatchev
>> <dnovatchev@gmail
>> .com>
To
>> xsl-list@xxxxxxxxxxxxxxxxxxxxxx
>> 07/24/2009 11:00
cc
>> PM
>>
Subject
>> Re: Re: question on random
>> Please respond to numbers for browser XSLT
>> xsl-list@xxxxxxxx
>> lberrytech.com
>>
>>
>>
>>
>>
>>
>>
>>
>>> If you have decided to go with a service providing random numbers then
>>> xslt-ish way (set based) to do it would be a service receiving a number
>> and
>>> returning an xml with a specified number of random numbers.
>>>
>>
>> Using a service to provide a random sequence is much more unreliable
>> and inefficient than just doing this in pure XSLT, as this has been
>> done by FXSL for many years:
>>
>>
>>
http://fxsl.sourceforge.net/articles/Random/Casting%20the%20Dice%20with%20FXS
L-htm.htm
>>
>>
>>
>> --
>> Cheers,
>> Dimitre Novatchev
>> ---------------------------------------
>> Truly great madness cannot be achieved without significant intelligence.
>> ---------------------------------------
>> To invent, you need a good imagination and a pile of junk
>> -------------------------------------
>> Never fight an inanimate object
>> -------------------------------------
>> You've achieved success in your field when you don't know whether what
>> you're doing is work or play
>>
>>
>>
>> On Fri, Jul 24, 2009 at 1:48 PM, Vladimir
>> Nesterovsky<vladimir@xxxxxxxxxxxxxxxxxxxx> wrote:
>>> If you have decided to go with a service providing random numbers then
>>> xslt-ish way (set based) to do it would be a service receiving a number
>> and
>>> returning an xml with a specified number of random numbers.
>>> --
>>> Vladimir Nesterovsky
>>> http://www.nesterovsky-bros.com/
>>>
>>>
>>>> To Ben:
>>>> The cache-append idea was my first thought, but I couldn't think of a
>>>
>>> good
>>>>
>>>> way to pull together how to have each request be unique. It's possible
>>>> using node-set(), though:
>>>> ...
>>>> ...
>>>> <xsl:choose>
>>>> <xsl:when test="function-available('exsl:node-set')">
>>>> <xsl:value-of select="document(concat('/cgi-bin/rand.pl?',
>>>
>>> $scale,
>>>>
>>>> '&x=', generate-id(exsl:node-set($seed))))" />
>>>> </xsl:when>
>>>> <xsl:when test="function-available('msxsl:node-set')">
>>>> <xsl:value-of select="document(concat('/cgi-bin/rand.pl?',
>>>
>>> $scale,
>>>>
>>>> '&x=', generate-id(msxsl:node-set($seed))))" />
>>>> </xsl:when>
>>>> ...
>>>
>>> I tried your solution and after replacing '&x=' with '+' it
directly
>>> worked on my local web server!
>>> (I did not know that generate-id works in a browser)
>>>
>>> But as already posted it did not work after installed on my real
>> webserver
>>> because that does not have enough power to handle the six document
opens.
>>>
>>> Btw, I really like the solution of David Carlisle to provide
>> exslt:node-set
>>> for IE browsers (and not having to deal with exslt/msxml):
>>> http://dpcarlisle.blogspot.com/2007/05/exslt-node-set-function.html
>>
>>
>
>
>
> --
> Cheers,
> Dimitre Novatchev
> ---------------------------------------
> Truly great madness cannot be achieved without significant intelligence.
> ---------------------------------------
> To invent, you need a good imagination and a pile of junk
> -------------------------------------
> Never fight an inanimate object
> -------------------------------------
> You've achieved success in your field when you don't know whether what
> you're doing is work or play
| Current Thread |
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Michael Kay - 24 Jul 2009 14:36:42 -0000
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