Subject: Re: JSON-encoding strings in XSLT 2.0
From: Michael Kay <mike@xxxxxxxxxxxx>
Date: Tue, 29 Oct 2013 11:46:12 +0000
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On 29 Oct 2013, at 11:02, Martynas JuseviD
ius <martynas@xxxxxxxxxxxx> 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@xxxxxxxxxxxx> 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 JuseviD
ius <martynas@xxxxxxxxxxxx>
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
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