DataPower appliance had this cascade of regexp:relace() statements in the
past in stylesheet "store:///jsonx2json.xsl" for "<json:string>" escaping.
Customer raised a PMR on bad performance for JSONX <json:string>
conversions
to JSON (he proved by using stylesheet profiling).
I did fix that in this May fixpack by introducing new extension function
for doing the escaping in firmware rather than XSLT and just calling that
by
"dp:encode(., 'json-escape')":
http://www-01.ibm.com/support/docview.wss?uid=swg1IC90781
This improved conversion runtime for a 2.2MB JSONX customer sample file
with 740KB JSON output by a factor of 11.
So if you have to do JSON escaping in XSLT, you have no choice.
If not, then better do it in a new extension function.
Mit besten Gruessen / Best wishes,
Hermann Stamm-Wilbrandt
Level 3 support for XML Compiler team and Fixpack team lead
WebSphere DataPower SOA Appliances
https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/
https://twitter.com/HermannSW/ http://www.stamm-wilbrandt.de/ce/
----------------------------------------------------------------------
IBM Deutschland Research & Development GmbH
Vorsitzende des Aufsichtsrats: Martina Koederitz
Geschaeftsfuehrung: Dirk Wittkopp
Sitz der Gesellschaft: Boeblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
From: Michael Kay <mike(_at_)saxonica(_dot_)com>
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com,
Date: 10/29/2013 12:46 PM
Subject: Re: [xsl] JSON-encoding strings in XSLT 2.0
On 29 Oct 2013, at 11:02, Martynas Jusevičius <martynas(_at_)graphity(_dot_)org>
wrote:
Thanks Michael. I was looking at http://json.org and here's what I came
up with:
<xsl:template match="text()" mode="json-identity">
<xsl:value-of
select="replace(replace(replace(replace(replace(replace(., '\\',
'\\\\'), '''', '\\'''), '"', '\\"'), '	', '\\t'),
' ', '\\n'), ' ', '\\r')"/>
</xsl:template>
Can this be improved?
Well, I'm not going to check that the list of characters to be escaped is
complete, but you've got the right idea. I would code it like this for
readability:
<xsl:template match="text()" mode="json-identity">
<xsl:variable name="v" select="."/>
<xsl:variable name="v" select="replace($v, '\\', '\\\\')"/>
<xsl:variable name="v" select="replace($v, '"', '\\"')"/>
...
<xsl:value-of select="$v"/>
</xsl:variable>
or in 3.0 you can use the "!" operator for function chaining:
<xsl:template match="text()" mode="json-identity">
<xsl:value-of select="replace(., '\\', '\\\\') ! replace(.,
'"', '\\"') ! ....."/>
</xsl:variable>
Michael Kay
Saxonica
<xsl:value-of
select="replace(replace(replace(replace(replace(replace(., '\\',
'\\\\'), '''', '\\'''), '"', '\\"'), '	', '\\t'),
' ', '\\n'), ' ', '\\r')"/>
</xsl:template>
On Tue, Oct 29, 2013 at 10:37 AM, Michael Kay <mike(_at_)saxonica(_dot_)com>
wrote:
There's no built-in function for the job, but picking out the characters
=
that need special treatment (e.g. replacing newline by "\n") isn't =
difficult. Handling astral characters is a bit tricky because JSON =
requires them to be represented as a surrogate pair, but again the logic
=
for that isn't really difficult.
Michael Kay
Saxonica
On 29 Oct 2013, at 00:56, Martynas Jusevičius
<martynas(_at_)graphity(_dot_)org>
wrote:
Hey,
is there some way in XSLT 2.0 to encode strings for use in JSON? In my
case, the stylesheet has to encode all text nodes in a XHTML fragment
which then gets passed to WYSIWYM editor constructor. Could this be
done as identity transform?
I had solved this problem when I used XSLT 1.0 on PHP by calling
json_encode() as extension function, but now I'm in the Java world.
http://php.net/manual/en/function.json-encode.php
Martynas
graphityhq.com
--~------------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail:
<mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--
--~------------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail:
<mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--
--~------------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail:
<mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--
--~------------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail: <mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--
--~------------------------------------------------------------------
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
To unsubscribe, go to: http://lists.mulberrytech.com/xsl-list/
or e-mail: <mailto:xsl-list-unsubscribe(_at_)lists(_dot_)mulberrytech(_dot_)com>
--~--