Re: [xsl] Function converting RFC 2822 date to xsd:dateTime

Thanks Michael, I will have parse-ietf-date() in mind.

As for invalid values, the template invoking the function should
handle the error with some kind of conditional and skip creating
content with such values.

How would such error handling look like? Preferably in XSLT 2.0, but
I'm also interested in how it would compare to XSLT 3.0.

I was reading about the error() function in relation to this, but
couldn't figure out how exactly it could be used here.

On Tue, Apr 9, 2019 at 12:16 AM Michael Kay mike(_at_)saxonica(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
> Are you aware that XPath 3.0 has the function parse-ietf-date() for this?
>
> https://www.w3.org/TR/xpath-functions-31/#func-parse-ietf-date
>
> The Saxon implementation is in Java; I haven't attempted an XPath 
> implementation. But you might find the spec (and the associated notes) is 
> useful in itself; and of course the QT3 test suite has test cases.
>
> I don't know how date/times in RFC 2822 relate to all the other miscellaneous 
> RFCs referenced in the spec. Liam Quin did most of the research for this.
>
> What are your requirements for handling invalid values?
>
> Michael Kay
> Saxonica
>
> > On 8 Apr 2019, at 22:58, Martynas Jusevičius 
> > martynas(_at_)atomgraph(_dot_)com 
> > <xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
> >
> > Hi,
> >
> > I have an XSLT 2.0 task where I'm parsing email Date headers defined
> > in RFC 2822 and converting them to xsd:dateTime.
> >
> > Below is a function that converts between the two. I wanted to hear if
> > there are improvements that could be made?
> >
> >    <xsl:function name="aex:rfc2822dateTime-to-dateTime" as="xs:dateTime">
> >        <xsl:param name="date-time" as="xs:string"/> <!-- Tue, 9 Apr
> > 2019 00:07:24 +1200 (NZST) -->
> >        <xsl:variable name="months" select="'Jan', 'Feb', 'Mar',
> > 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'"
> > as="xs:string*"/>
> >        <xsl:analyze-string select="$date-time"
> >            
> > regex="^(?:(Sun|Mon|Tue|Wed|Thu|Fri|Sat),\s+)?(0[1-9]|[1-2]?[0-9]|3[01])\s+(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\s+(19[0-9]{{2}}|[2-9][0-9]{{3}})\s+(2[0-3]|[0-1][0-9]):([0-5][0-9])(?::(60|[0-5][0-9]))?\s+([-\+][0-9]{{2}}[0-5][0-9]|(?:UT|GMT|(?:E|C|M|P)(?:ST|DT)|[A-IK-Z]))(\s+|\(([^\(\)]+|\\\(|\\\))*\))*$">
> >            <xsl:matching-substring>
> >                <xsl:sequence
> > select="xs:dateTime(concat(format-number(xs:integer(regex-group(4)),
> > '0001'), '-', format-number(index-of($months, regex-group(3)), '01'),
> > '-', format-number(xs:integer(regex-group(2)), '01'), 'T',
> > format-number(xs:integer(regex-group(5)), '01'), ':',
> > format-number(xs:integer(regex-group(6)), '01'), ':',
> > format-number(xs:integer(regex-group(7)), '01'),
> > substring(regex-group(8), 1, 3), ':', substring(regex-group(8), 4,
> > 2)))"/>
> >            </xsl:matching-substring>
> >            <xsl:non-matching-substring>
> >                <xsl:message>Invalid RFC 2822 datetime: <xsl:value-of
> > select="$date-time"/></xsl:message>
> >            </xsl:non-matching-substring>
> >        </xsl:analyze-string>
> >    </xsl:function>
> >
> > The regex pattern is taken from
> > https://stackoverflow.com/questions/9352003/rfc-2822-date-regex
> >
> > Martynas
> > atomgraph.com
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