Subject: Re: [xsl] First steps with high order functions From: "Christophe Marchand cmarchand@xxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 19 Jun 2018 11:14:17 -0000 |
Best regards, Christophe
On 19.06.2018 12:33, Christophe Marchand cmarchand@xxxxxxxxxx wrote:
I'm trying to learn high order functions, and I have some difficulties. If someone could help...
I have a normal function :
B B <xsl:function name="nu:camelCase" as="xs:string?"> B B B B <xsl:param name="s" as="xs:string?"/> B B B B ... B B </xsl:function>
I want to apply it on each word of a sentence :
B B <xsl:function name="nu:clearUsername" as="xs:string?">
B B B B <xsl:param name="name" as="xs:string?"/>
B B B B <xsl:choose>
B B B B B B <xsl:when test="empty($name)"><xsl:sequence select="()"/></xsl:when>
B B B B B B <xsl:when test="contains($name, ' ')">
B B B B B B B B <xsl:variable name="temp" select="tokenize($name, ' ')"/>
B B B B B B B B <xsl:sequence select="string-join(for-each($temp, nu:camelCase#1), ' ')"/>
B B B B B B </xsl:when>
B B B B B B <xsl:otherwise>
B B B B B B B B <xsl:sequence select="$name"/>
B B B B B B </xsl:otherwise>
B B B B </xsl:choose>
B B </xsl:function>
Does the for-each is correct ?
I think it should work as long as the higher-order function feature is supported.
Is there another syntax to make this work with Saxon-HE ?
Saxon 9.8 HE doesn't support the higher-order function feature so using the "for-each" function with it is not possible.
https://www.w3.org/TR/xpath-functions/#func-for-each however explains
B for-each($SEQ, $F) is equivalent to the expression for $i in $SEQ return $F($i), assuming that ordering mode is ordered.
so you can use B for $i in $temp return nu:camelCase($i)
to avoid the use of the "for-each" function.
Is there a better way to do this ?
If you learn XPath 3.1 you could also try to get accustomed to be arrow operator and use
B $name => tokenize(' ') => for-each(nu:camelCase#1) => string-join(' ')
in the long run that might be more readable then the nesting of function calls.
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