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220 lines
9.2 KiB
XML
220 lines
9.2 KiB
XML
<?xml version='1.0'?>
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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xmlns:d="http://docbook.org/ns/docbook"
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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 d"
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version='1.0'>
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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://cdn.docbook.org/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="charmap">
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<info>
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<title>Common » Character-Map Template Reference</title>
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<releaseinfo role="meta">
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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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character-map templates in the DocBook XSL 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 character-map templates don’t import or include
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any DocBook XSL stylesheet parameters, so the
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character-map templates can be used without importing the
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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="apply-character-map" xmlns="">
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<refpurpose>Applies an XSLT character map</refpurpose>
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<refdescription id="apply-character-map-desc">
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<para>This template applies an <link
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xlink:href="http://www.w3.org/TR/xslt20/#character-maps"
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>XSLT character map</link>; that is, it causes certain
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individual characters to be substituted with strings of one
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or more characters. It is useful mainly for replacing
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multiple “special” characters or symbols in the same target
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content. It uses the value of
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<parameter>map.contents</parameter> to do substitution on
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<parameter>content</parameter>, and then returns the
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modified contents.</para>
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<note>
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<para>This template is a very slightly modified version of
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Jeni Tennison’s <function>replace_strings</function>
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template in the <link
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xlink:href="http://www.dpawson.co.uk/xsl/sect2/StringReplace.html#d9351e13"
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>multiple string replacements</link> section of Dave Pawson’s
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<link xlink:href="http://www.dpawson.co.uk/xsl/index.html"
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>XSLT FAQ</link>.</para>
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<para>The <function>apply-string-subst-map</function>
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template is essentially the same template as the
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<function>apply-character-map</function> template; the
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only difference is that in the map that
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<function>apply-string-subst-map</function> expects, <tag
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class="attribute">oldstring</tag> and <tag
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class="attribute">newstring</tag> attributes are used
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instead of <tag class="attribute">character</tag> and <tag
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class="attribute">string</tag> attributes.</para>
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</note>
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</refdescription>
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<refparameter id="apply-character-map-params">
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<variablelist>
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<varlistentry><term>content</term>
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<listitem>
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<para>The content on which to perform the character-map
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substitution.</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>map.contents</term>
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<listitem>
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<para>A node set of elements, with each element having
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the following attributes:
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<itemizedlist>
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<listitem>
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<simpara><tag class="attribute">character</tag>, a
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character to be replaced</simpara>
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</listitem>
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<listitem>
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<simpara><tag class="attribute">string</tag>, a
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string with which to replace <tag
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class="attribute">character</tag></simpara>
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</listitem>
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</itemizedlist>
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</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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</doc:template>
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<xsl:template name="apply-character-map">
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<xsl:param name="content"/>
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<xsl:param name="map.contents"/>
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<xsl:variable name="replaced_text">
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<xsl:call-template name="string.subst">
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<xsl:with-param name="string" select="$content" />
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<xsl:with-param name="target"
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select="$map.contents[1]/@character" />
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<xsl:with-param name="replacement"
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select="$map.contents[1]/@string" />
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</xsl:call-template>
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</xsl:variable>
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<xsl:choose>
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<xsl:when test="$map.contents[2]">
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<xsl:call-template name="apply-character-map">
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<xsl:with-param name="content" select="$replaced_text" />
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<xsl:with-param name="map.contents"
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select="$map.contents[position() > 1]" />
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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 select="$replaced_text" />
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</xsl:otherwise>
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</xsl:choose>
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</xsl:template>
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<!-- ===================================== -->
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<doc:template name="read-character-map" xmlns="">
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<refpurpose>Reads in all or part of an XSLT character map</refpurpose>
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<refdescription id="read-character-map-desc">
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<para>The XSLT 2.0 specification describes <link
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xlink:href="http://www.w3.org/TR/xslt20/#character-maps"
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>character maps</link> and explains how they may be used
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to allow a specific character appearing in a text or
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attribute node in a final result tree to be substituted by
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a specified string of characters during serialization. The
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<function>read-character-map</function> template provides a
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means for reading and using character maps with XSLT
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1.0-based tools.</para>
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<para>This template reads the character-map contents from
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<parameter>uri</parameter> (in full or in part, depending on
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the value of the <parameter>use.subset</parameter>
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parameter), then passes those contents to the
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<function>apply-character-map</function> template, along with
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<parameter>content</parameter>, the data on which to perform
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the character substitution.</para>
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<para>Using the character map “in part” means that it uses only
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those <tag>output-character</tag> elements that match the
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XPath expression given in the value of the
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<parameter>subset.profile</parameter> parameter. The current
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implementation of that capability here relies on the
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<function>evaluate</function> extension XSLT function.</para>
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</refdescription>
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<refparameter id="read-character-map-params">
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<variablelist>
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<varlistentry><term>use.subset</term>
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<listitem>
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<para>Specifies whether to use a subset of the character
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map instead of the whole map; boolean
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<literal>0</literal> or <literal>1</literal></para>
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</listitem>
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</varlistentry>
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<varlistentry><term>subset.profile</term>
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<listitem>
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<para>XPath expression that specifies what subset of the
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character map to use</para>
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</listitem>
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</varlistentry>
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<varlistentry><term>uri</term>
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<listitem>
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<para>URI for a character map</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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</doc:template>
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<xsl:template name="read-character-map">
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<xsl:param name="use.subset"/>
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<xsl:param name="subset.profile"/>
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<xsl:param name="uri"/>
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<xsl:choose>
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<xsl:when test="$use.subset != 0">
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<!-- *use a subset of the character map instead of the full map -->
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<xsl:choose>
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<!-- * xsltproc and Xalan both support dyn:evaluate() -->
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<xsl:when test="function-available('dyn:evaluate')">
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<xsl:copy-of select="document($uri)//*[local-name()='output-character']
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[dyn:evaluate($subset.profile)]"/>
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</xsl:when>
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<!-- * Saxon has its own evaluate() and doesn't support dyn:evaluate() -->
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<xsl:when test="function-available('saxon:evaluate')">
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<xsl:copy-of select="document($uri)//*[local-name()='output-character']
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[saxon:evaluate($subset.profile)]"/>
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</xsl:when>
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<xsl:otherwise>
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<xsl:message terminate="yes"
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>
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Error: To process character-map subsets, you must use an XSLT engine
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that supports the evaluate() XSLT extension function. Your XSLT engine
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does not support it.
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</xsl:message>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:when>
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<xsl:otherwise>
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<!-- *value of $use.subset is non-zero, so use the full map -->
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<xsl:copy-of select="document($uri)//*[local-name()='output-character']"/>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:template>
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</xsl:stylesheet>
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