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Re: [xsl] Moving element up hierarchy unless text nodes


Subject: Re: [xsl] Moving element up hierarchy unless text nodes
From: "Wendell Piez wapiez@xxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 2 Mar 2015 19:10:49 -0000

Hi James,

So, try this. It works by assigning 'pb' elements to ancestors that
consider them 'leading' (start the element off) or 'trailing'. They
can be retrieved from (for) said ancestor using a key.

Lightly tested.

<xsl:template match="comment() | processing-instruction() | text() | @*">
  <xsl:copy-of select="."/>
</xsl:template>

<xsl:template match="*">
  <xsl:copy-of select="key('leading-pb',generate-id())"/>
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
  <xsl:copy-of select="key('trailing-pb',generate-id())"/>
</xsl:template>

<xsl:template match="pb">
  <!-- Only copy the pb if no ancestor considers it 'leading' or 'trailing'. -->
  <xsl:if test="empty(
    ancestor::*/(key('leading-pb',generate-id()) |
key('trailing-pb',generate-id())) intersect . )  ">
    <xsl:copy-of select="."/>
  </xsl:if>
</xsl:template>

<xsl:key name="leading-pb" match="pb">
  <xsl:apply-templates select="." mode="leading-pb"/>
</xsl:key>

<xsl:key name="trailing-pb" match="pb">
  <xsl:apply-templates select="." mode="trailing-pb"/>
</xsl:key>

<xsl:template match="body/*" mode="leading-pb trailing-pb">
  <xsl:sequence select="generate-id()"/>
</xsl:template>

<xsl:template match="*" mode="leading-pb">
  <xsl:choose>
    <xsl:when test="empty(preceding-sibling::*/(. except self::pb) |
preceding-sibling::text()[matches(.,'\S')])">
      <xsl:apply-templates select=".." mode="leading-pb"/>
    </xsl:when>
    <xsl:otherwise>
      <xsl:sequence select="generate-id()"/>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

<xsl:template match="*" mode="trailing-pb">
  <xsl:choose>
    <xsl:when test="empty(following-sibling::*/(. except self::pb) |
following-sibling::text()[matches(.,'\S')])">
      <xsl:apply-templates select=".." mode="trailing-pb"/>
    </xsl:when>
    <xsl:otherwise>
      <xsl:sequence select="generate-id()"/>
    </xsl:otherwise>
  </xsl:choose>
</xsl:template>

Feel free to ask for any explanation needed. It *seems* to work
(although I often do not trust my lying eyes) ... :-)

Cheers, Wendell

On Fri, Feb 27, 2015 at 6:51 PM, James Cummings
james@xxxxxxxxxxxxxxxxx <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
wrote:
>
> Hi there.
>
> We've been looking at canonicalising use of <pb/> in a large collection of
> TEI P5 XML texts. What we want to do is move this up the hierarchy unless
> there is text before or after it only stopping when there is a sibling
> element with textual content or when it hits the body/back/front elements.
> i.e. someone might have encoded:
>
>
> ====input====
> <body>
>     <div>
>         <lg>
>             <l><pb n="1"/> some text here</l>
>             <l>some text here <pb n="2"/></l>
>         </lg>
>         <lg>
>             <l>some text <pb n="3"/> some text</l>
>             <anchor xml:id="test"/>
>             <l><pb n="4"/>some text here</l>
>             <l>some text here <pb n="5"/></l>
>             <anchor xml:id="test2"/>
>         </lg>
>     </div>
>     <div>
>         <head>Some Text</head>
>         <lg>
>             <!-- A comment here -->
>             <l><pb n="6"/>Some text</l>
>             <l>Some text<pb n="7"/></l>
>         </lg>
>     </div>
> </body>
> =====
>
> And what we'd want to end up with is:
>
> =====
> <body>
>     <pb n="1"/>
>     <div>
>         <lg>
>             <l> some text here</l>
>             <l>some text here </l>
>         </lg>
>         <pb n="2"/>
>         <lg>
>             <l>some text <pb n="3"/> some text</l>
>             <pb n="4"/>
>             <anchor xml:id="test"/>
>             <l>some text here</l>
>             <l>some text here </l>
>             <anchor xml:id="test2"/>
>         </lg>
>     </div>
>     <pb n="5"/>
>     <div>
>         <head>Some Text</head>
>         <pb n="6"/>
>         <lg>
>             <!-- A comment here -->
>             <l>Some text</l>
>             <l>Some text</l>
>         </lg>
>     </div>
>     <pb n="7"/>
> </body>
> =====
>
> So as the <pb/> has text before/after it, it stays where it is. It should
> move to the level in the hierarchy where its preceding-sibling::node()[1]
> has text, passing over other empty elements or comments.  (Of course, as you
> might expect) the markup could be any element names, I just use div/lg/l
> here because it is short and nicely hierarchicial as an example. My approach
> so far has been, on every element to try to test if there is text() between
> where I currently am and the following::pb[1] by selecting everything
> between the start and the pb and looking at its normalised string-length.
> But so far these tests aren't working right, and I haven't even got my head
> round how to do it in reverse for <pb/> at the end.
>
> Has anyone done something like this before that I could look at? Any
> suggestions?
>
> Thanks for any help!
>
> -James Cummings
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-- 
Wendell Piez | http://www.wendellpiez.com
XML | XSLT | electronic publishing
Eat Your Vegetables
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