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Re: A function that tokenizes a string, wrapping each

Subject: Re: A function that tokenizes a string, wrapping each token in start-tag , end-tag pairs?
From: "Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 21 Apr 2016 15:13:10 -0000
Re:  A function that tokenizes a string
Why not use xsl:analyze-string?

<xsl:analyze-string select="$line" regex="....">
  <xsl:matching-substring/>
  <xsl:non-matching-substring>
    <xsl:variable name="p" select="position()"/>
    <xsl:element name="{$tag[$p]}"><xsl:value-of select="."/></xsl:element>
  </xsl:non-matching-substring>
</xsl:analyze-string>

For reusability in XSLT 3.0 this is a good candidate for a
higher-order-function - you could pass a parameter which is a function to be
called to determine the element name to be used for the Nth token.

Michael Kay
Saxonica


> On 21 Apr 2016, at 13:20, Costello, Roger L. costello@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi Folks,
>
> I want a function that tokenizes a string and wraps each token in a
start-tag, end-tag pair.
>
> I figure that I should pass into the function the string to be tokenized and
a sequence of integers corresponding to the decimal value(s) of the token
delimiter.
>
> Also, I figure that I should pass into the function a sequence of strings,
corresponding to the tag names to be used for wrapping each token.
>
> I've implemented the function, see below. It works fine, but I want to know
if it can be improved. Is there a way to write the function more idiomatic?
Shorter? Generalized to be more widely useful?  /Roger
>
>
>    <!--
>    	Create an element for each non-empty token in $line.
>    	$line is tokenized using the sequence of symbols denoted
>    	by $line-delimiter.
>    	For the token at position i, name the element using the
>    	string in headers[$i]
>   -->
>    <xsl:function name="f:line" as="element()*">
>    	<xsl:param name="line" as="xs:string" />
>    	<xsl:param name="line-delimiter" as="xs:integer+" />
>        	<xsl:param name="headers" as="xs:string+" />
>
>    	<xsl:variable name="tokens" select="tokenize($line,
codepoints-to-string($line-delimiter))" as="xs:string*" />
>        	<xsl:variable name="len" select="count($tokens)" as="xs:integer" />
>        	<xsl:for-each select="1 to $len">
>            		<xsl:variable name="index" select="xs:integer(.)"
as="xs:integer" />
>            		<xsl:variable name="value" select="$tokens[position() eq
$index]" as="xs:string" />
>            		<xsl:choose>
>                		<xsl:when test="$value eq ''"/>
>                		<xsl:otherwise>
>                			<xsl:element name="{$headers[position() eq $index]}">
>                        				<xsl:sequence select="$value"/>
>                    			</xsl:element>
>                		</xsl:otherwise>
>            		</xsl:choose>
>        	</xsl:for-each>
>
>    </xsl:function>

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