Re: [xsl] Seeking an elegant XSLT function to check that a pair of numeric ranges are consecutive

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

> This XPath expression is lovely, but what if the start of the range is a
negative integer?

My guess is that  this is not the case with this problem, otherwise they
would have chosen another range delimiter, for example "~".

Thanks,
Dimitre

On Sat, May 25, 2024 at 1:13b/PM Jeffrey Greif jgreif@xxxxxxxxxxxxxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> This XPath expression is lovely, but what if the start of the range is a
> negative integer?
>
> On Sat, May 25, 2024 at 11:30b/AM Dimitre Novatchev dnovatchev@xxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>> Here is a pure XPath solution - 7 lines well-formatted expression:
>>
>> let $ranges := /*/*/*,
>>     $starts := $ranges/xs:integer(substring-before(. || '-', '-')),
>>     $ends := $ranges/xs:integer(if(contains(., '-')) then
>> substring-after(., '-')
>>                                 else .)
>>   return
>>     every $i in 1 to count($starts) -1 satisfies
>>       $ends[$i] eq $starts[$i +1] -1
>>
>> Thanks,
>> Dimitre
>>
>> On Sat, May 25, 2024 at 8:51b/AM Roger L Costello costello@xxxxxxxxx <
>> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>>> Hi Folks,
>>>
>>> I have an XML document that contains a series of records and each record
>>> contains a numeric range:
>>>
>>> <Document>
>>>     <Record>
>>>         <Range>0-2</Range>
>>>     </Record>
>>>     <Record>
>>>         <Range>3-7</Range>
>>>     </Record>
>>>     <Record>
>>>         <Range>8</Range>
>>>     </Record>
>>>     <Record>
>>>         <Range>9-15</Range>
>>>     </Record>
>>> </Document>
>>>
>>> Notice that a "range" is either two integers separated by a dash (e.g.,
>>> 0-2), or a single integer (e.g., 8).
>>>
>>> I need to check the ranges, to ensure that adjacent pairs contain ranges
>>> that are consecutive. Thus, this pair of ranges:
>>>
>>>     0-2, 3-7
>>>
>>> is good (i.e., consecutive), but this pair of ranges:
>>>
>>>     0-2, 5-8
>>>
>>> is bad (i.e., not consecutive).
>>>
>>> I wrote an XSLT function that checks a pair of ranges and returns true
>>> if they are consecutive and false if they are not consecutive.
>>>
>>> My function is okay. It seems to work properly. But it's kind of ugly
>>> and brute-force. I wonder if there is a more elegant solution?
>>>
>>> Here is my function:
>>>
>>> <xsl:function name="f:do-ranges-connect" as="xs:boolean">
>>>     <xsl:param name="previous-range"/>
>>>     <xsl:param name="current-range"/>
>>>     <xsl:choose>
>>>         <xsl:when test="matches($previous-range,'^[0-9]+$') and
>>> matches($current-range,'^[0-9]+$')">
>>>             <xsl:value-of select="xs:integer($current-range) eq
>>> xs:integer($previous-range) + 1"/>
>>>         </xsl:when>
>>>         <xsl:when test="matches($previous-range,'^[0-9]+$') and
>>> matches($current-range,'^[0-9]+-[0-9]+$')">
>>>             <xsl:variable name="start"
>>> select="substring-before($current-range,'-')"/>
>>>             <xsl:value-of select="xs:integer($start) eq
>>> xs:integer($previous-range) + 1"/>
>>>         </xsl:when>
>>>         <xsl:when test="matches($previous-range,'^[0-9]+-[0-9]+$') and
>>> matches($current-range,'^[0-9]+$')">
>>>             <xsl:variable name="end"
>>> select="substring-after($previous-range,'-')"/>
>>>             <xsl:value-of select="xs:integer($current-range) eq
>>> xs:integer($end) + 1"/>
>>>         </xsl:when>
>>>         <xsl:when test="matches($previous-range,'^[0-9]+-[0-9]+$') and
>>> matches($current-range,'^[0-9]+-[0-9]+$')">
>>>             <xsl:variable name="start"
>>> select="substring-before($current-range,'-')"/>
>>>             <xsl:variable name="end"
>>> select="substring-after($previous-range,'-')"/>
>>>             <xsl:value-of select="xs:integer($start) eq xs:integer($end)
>>> + 1"/>
>>>         </xsl:when>
>>>         <xsl:otherwise>
>>>             <xsl:message>The range strings are
>>> non-conformant</xsl:message>
>>>             <xsl:value-of select="false()"/>
>>>         </xsl:otherwise>
>>>     </xsl:choose>
>>> </xsl:function>
>>>
>>>
>>>
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