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<?xml version='1.0'?>
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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                xmlns:doc="http://nwalsh.com/xsl/documentation/1.0"
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                xmlns:dyn="http://exslt.org/dynamic"
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                xmlns:saxon="http://icl.com/saxon"
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                xmlns:xlink="http://www.w3.org/1999/xlink"
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                exclude-result-prefixes="doc dyn saxon"
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                version='1.0'>
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<!-- ********************************************************************
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     $Id: utility.xsl 7101 2007-07-20 15:32:12Z xmldoc $
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     ********************************************************************
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     This file is part of the XSL DocBook Stylesheet distribution.
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     See ../README or http://docbook.sf.net/release/xsl/current/ for
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     copyright and other information.
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     ******************************************************************** -->
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<doc:reference xmlns="" xml:id="utility">
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  <info>
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    <title>Common » Utility Template Reference</title>
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    <releaseinfo role="meta">
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      $Id: utility.xsl 7101 2007-07-20 15:32:12Z xmldoc $
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    </releaseinfo>
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  </info>
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  <!-- * yes, partintro is a valid child of a reference... -->
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  <partintro xml:id="partintro">
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    <title>Introduction</title>
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    <para>This is technical reference documentation for the
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      miscellaneous utility templates in the DocBook XSL
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      Stylesheets.</para>
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    <note>
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      <para>These templates are defined in a separate file from the set
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        of “common” templates because some of the common templates
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        reference DocBook XSL stylesheet parameters, requiring the
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        entire set of parameters to be imported/included in any
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        stylesheet that imports/includes the common templates.</para>
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      <para>The utility templates don’t import or include any DocBook
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        XSL stylesheet parameters, so the utility templates can be used
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        without importing the whole set of parameters.</para>
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    </note>
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    <para>This is not intended to be user documentation. It is
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      provided for developers writing customization layers for the
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      stylesheets.</para>
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  </partintro>
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</doc:reference>
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<!-- ====================================================================== -->
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<doc:template name="log.message" xmlns="">
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  <refpurpose>Logs/emits formatted notes and warnings</refpurpose>
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  <refdescription id="log.message-desc">
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    <para>The <function>log.message</function> template is a utility
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    template for logging/emitting formatted messages&#xa0;– that is,
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    notes and warnings, along with a given log “level” and an
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    identifier for the “source” that the message relates to.</para>
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  </refdescription>
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  <refparameter id="log.message-params">
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    <variablelist>
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      <varlistentry><term>level</term>
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        <listitem>
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          <para>Text to log/emit in the message-level field to
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            indicate the message level
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          (<literal>Note</literal> or
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          <literal>Warning</literal>)</para>
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        </listitem>
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      </varlistentry>
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      <varlistentry><term>source</term>
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        <listitem>
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          <para>Text to log/emit in the source field to identify the
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            “source” to which the notification/warning relates.
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            This can be any arbitrary string, but because the
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            message lacks line and column numbers to identify the
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            exact part of the source document to which it
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            relates, the intention is that the value you pass
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            into the <literal>source</literal> parameter should
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            give the user some way to identify the portion of
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            their source document on which to take potentially
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            take action in response to the log message (for
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            example, to edit, change, or add content).</para>
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          <para>So the <literal>source</literal> value should be,
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            for example, an ID, book/chapter/article title, title
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            of some formal object, or even a string giving an
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            XPath expression.</para>
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        </listitem>
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      </varlistentry>
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      <varlistentry><term>context-desc</term>
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        <listitem>
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          <para>Text to log/emit in the context-description field to
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            describe the context for the message.</para>
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        </listitem>
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      </varlistentry>
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      <varlistentry><term>context-desc-field-length</term>
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        <listitem>
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          <para>Specifies length of the context-description field
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            (in characters); default is 12</para>
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          <para>If the text specified by the
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            <literal>context-desc</literal> parameter is longer
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            than the number of characters specified in
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            <literal>context-desc-field-length</literal>, it is
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            truncated to <literal>context-desc-field-length</literal>
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            (12 characters by default).</para>
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          <para>If the specified text is shorter than
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            <literal>context-desc-field-length</literal>,
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          it is right-padded out to
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          <literal>context-desc-field-length</literal> (12 by
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          default).</para>
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        <para>If no value has been specified for the
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          <literal>context-desc</literal> parameter, the field is
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          left empty and the text of the log message begins with
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          the value of the <literal>message</literal>
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          parameter.</para>
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        </listitem>
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      </varlistentry>
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      <varlistentry><term>message</term>
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        <listitem>
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          <para>Text to log/emit in the actual message field</para>
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        </listitem>
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      </varlistentry>
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      <varlistentry><term>message-field-length</term>
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        <listitem>
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          <para>Specifies length of the message
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            field (in characters); default is 45</para>
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        </listitem>
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      </varlistentry>
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    </variablelist>
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  </refparameter>
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  <refreturn id="log.message-returns">
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  <para>Outputs a message (generally, to standard error).</para></refreturn>
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</doc:template>
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<xsl:template name="log.message">
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  <xsl:param name="level"/>
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  <xsl:param name="source"/>
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  <xsl:param name="context-desc"/>
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  <xsl:param name="context-desc-field-length">12</xsl:param>
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  <xsl:param name="context-desc-padded">
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    <xsl:if test="not($context-desc = '')">
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      <xsl:call-template name="pad-string">
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        <xsl:with-param name="leftRight">right</xsl:with-param>
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        <xsl:with-param name="padVar"
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          select="substring($context-desc, 1, $context-desc-field-length)"/>
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        <xsl:with-param name="length" select="$context-desc-field-length"/>
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      </xsl:call-template>
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    </xsl:if>
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  </xsl:param>
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  <xsl:param name="message"/>
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  <xsl:param name="message-field-length" select="45"/>
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  <xsl:param name="message-padded">
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    <xsl:variable name="spaces-for-blank-level">
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      <!-- * if the level field is blank, we'll need to pad out -->
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      <!-- * the message field with spaces to compensate -->
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      <xsl:choose>
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        <xsl:when test="$level = ''">
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          <xsl:value-of select="4 + 2"/>
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          <!-- * 4 = hard-coded length of comment text ("Note" or "Warn") -->
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          <!-- * + 2 = length of colon-plus-space separator ": " -->
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        </xsl:when>
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        <xsl:otherwise>
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          <xsl:value-of select="0"/>
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        </xsl:otherwise>
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      </xsl:choose>
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    </xsl:variable>
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    <xsl:variable name="spaces-for-blank-context-desc">
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      <!-- * if the context-description field is blank, we'll need -->
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      <!-- * to pad out the message field with spaces to compensate -->
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      <xsl:choose>
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        <xsl:when test="$context-desc = ''">
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          <xsl:value-of select="$context-desc-field-length + 2"/>
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          <!-- * + 2 = length of colon-plus-space separator ": " -->
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        </xsl:when>
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        <xsl:otherwise>
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          <xsl:value-of select="0"/>
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        </xsl:otherwise>
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      </xsl:choose>
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    </xsl:variable>
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    <xsl:variable name="extra-spaces"
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      select="$spaces-for-blank-level + $spaces-for-blank-context-desc"/>
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    <xsl:call-template name="pad-string">
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      <xsl:with-param name="leftRight">right</xsl:with-param>
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      <xsl:with-param name="padVar"
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        select="substring($message, 1, ($message-field-length + $extra-spaces))"/>
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      <xsl:with-param name="length"
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        select="$message-field-length + $extra-spaces"/>
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    </xsl:call-template>
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  </xsl:param>
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  <!-- * emit the actual log message -->
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  <xsl:message>
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    <xsl:if test="not($level = '')">
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      <xsl:value-of select="$level"/>
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      <xsl:text>: </xsl:text>
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    </xsl:if>
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    <xsl:if test="not($context-desc = '')">
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      <xsl:value-of select="$context-desc-padded"/>
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      <xsl:text>: </xsl:text>
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    </xsl:if>
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    <xsl:value-of select="$message-padded"/>
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    <xsl:text>  </xsl:text>
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    <xsl:value-of select="$source"/>
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  </xsl:message>
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</xsl:template>
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<!-- ===================================== -->
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<doc:template name="get.doc.title" xmlns="">
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  <refpurpose>Gets a title from the current document</refpurpose>
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  <refdescription id="get.doc.title-desc">
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    <para>The <function>get.doc.title</function> template is a
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      utility template for returning the first title found in the
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      current document.</para>
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  </refdescription>
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  <refreturn id="get.doc.title-returns">
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  <para>Returns a string containing some identifying title for the
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    current document .</para></refreturn>
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</doc:template>
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<xsl:template name="get.doc.title">
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  <xsl:choose>
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    <xsl:when test="//*[local-name() = 'title'
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      or local-name() = 'refname']">
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      <xsl:value-of select="//*[local-name() = 'title'
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        or local-name() = 'refname'][1]"/>
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    </xsl:when>
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    <xsl:when test="substring(local-name(*[1]),
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      string-length(local-name(*[1])-3) = 'info')
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      and *[1]/*[local-name() = 'title']">
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      <xsl:value-of select="*[1]/*[local-name() = 'title'][1]"/>
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    </xsl:when>
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  </xsl:choose>
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</xsl:template>
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<!-- ===================================== -->
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<doc:template name="pad-string" xmlns="">
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  <refpurpose>Right-pads or left-pads a string out to a certain length</refpurpose>
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  <refdescription id="pad-string-desc">
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    <para>This function takes string <parameter>padVar</parameter> and
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      pads it out in the direction <parameter>rightLeft</parameter> to
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      the string-length <parameter>length</parameter>, using string
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      <parameter>padChar</parameter> (a space character by default) as
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      the padding string (note that <parameter>padChar</parameter> can
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      be a string; it is not limited to just being a single
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      character).</para>
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    <note>
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      <para>This function began as a copy of Nate Austin's
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        <function>prepend-pad</function> function in the <link
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          xlink:href="http://www.dpawson.co.uk/xsl/sect2/padding.html" >Padding
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          Content</link> section of Dave Pawson's <link
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          xlink:href="http://www.dpawson.co.uk/xsl/index.html" >XSLT
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          FAQ</link>.</para>
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    </note>
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  </refdescription>
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  <refreturn id="pad-string-returns">
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  <para>Returns a (padded) string.</para></refreturn>
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</doc:template>
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<xsl:template name="pad-string">
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  <!-- * recursive template to right/left pad the value with -->
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  <!-- * whatever padChar is passed in -->
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  <xsl:param name="padChar" select="' '"/>
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  <xsl:param name="leftRight">left</xsl:param>
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  <xsl:param name="padVar"/>
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  <xsl:param name="length"/>
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  <xsl:choose>
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    <xsl:when test="string-length($padVar) &lt; $length">
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      <xsl:call-template name="pad-string">
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        <xsl:with-param name="padChar" select="$padChar"/>
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        <xsl:with-param name="leftRight" select="$leftRight"/>
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        <xsl:with-param name="padVar">
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          <xsl:choose>
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            <!-- * determine whether string should be -->
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            <!-- * right- or left-padded -->
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            <xsl:when test="$leftRight = 'left'">
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              <!-- * pad it to left -->
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              <xsl:value-of select="concat($padChar,$padVar)"/>
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            </xsl:when>
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            <xsl:otherwise>
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              <!-- * otherwise, right-pad the string -->
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              <xsl:value-of select="concat($padVar,$padChar)"/>
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            </xsl:otherwise>
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          </xsl:choose>
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        </xsl:with-param>
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        <xsl:with-param name="length" select="$length"/>
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      </xsl:call-template>
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    </xsl:when>
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    <xsl:otherwise>
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      <xsl:value-of
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        select="substring($padVar,string-length($padVar) - $length + 1)"/>
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    </xsl:otherwise>
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  </xsl:choose>
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</xsl:template>
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</xsl:stylesheet>