Re: Line break algorithm

If (like me) you find xsl:iterate easier to get right than recursive
functions, then you could do something like

<xsl:iterate select="tokenize($input)">
  <xsl:param name="line-length" select="0"/>
  <xsl:choose>
     <xsl:when test="$line-length gt 35">
        <break/>
        <xsl:value-of select=". || ' '"/>
        <xsl:next-iteration>
           <xsl:with-param name="line-length" select="string-length(.) + 1"/>
        </xsl:next-iteration>
    </xsl:when>
    <xsl:otherwise>
        <xsl:value-of select=". || ' '"/>
        <xsl:next-iteration>
           <xsl:with-param name="line-length" select="$line-length +
string-length(.) + 1"/>
        </xsl:next-iteration>
    </xsl:otherwise>
  </xsl:choose>
</xsl:iterate>

Note that a solution using tokenize loses the original separators; if you want
to retain separators such as multiple spaces or tabs then you'll need to use
analyse-string instead.

There are probably more concise/elegant solutions using higher-order functions
and folding, but this one seems easy to read and understand.

Michael Kay
Saxonica


> On 3 May 2020, at 01:45, Rick Quatro rick@xxxxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi All,
>
> I have lines in my input that I want to add <break> elements to in my
output. For example, this might be the input:
>
> <xsl:param name="line" select="'Takeoff from Unlisted and Alternate
Airports'"/>
>
> and I want to replace a space with a <break> so that each line doesn't
exceed, for example, 35 characters
>
> <line>Takeoff from Unlisted and Alternate<break/>Airports</line>
>
> I am thinking the I can tokenize the line and then recursively build the
string back up from the beginning, checking its length. Any other suggestions
on a general-purpose algorithm that I can use in XSLT 3 would be appreciated.
Thanks in advance.
>
> Rick
>
> Rick Quatro
> Carmen Publishing Inc.
> rick@xxxxxxxxxxxxxxx <mailto:rick@xxxxxxxxxxxxxxx>
> 585-729-6746
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