1 | <?xml version='1.0'?>
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2 | <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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3 | xmlns:doc="http://nwalsh.com/xsl/documentation/1.0"
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4 | xmlns:dyn="http://exslt.org/dynamic"
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5 | xmlns:saxon="http://icl.com/saxon"
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6 | xmlns:xlink="http://www.w3.org/1999/xlink"
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7 | exclude-result-prefixes="doc dyn saxon"
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8 | version='1.0'>
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9 |
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10 | <!-- ********************************************************************
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11 | $Id: charmap.xsl 7266 2007-08-22 11:58:42Z xmldoc $
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12 | ********************************************************************
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13 |
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14 | This file is part of the XSL DocBook Stylesheet distribution.
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15 | See ../README or http://docbook.sf.net/release/xsl/current/ for
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16 | copyright and other information.
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17 |
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18 | ******************************************************************** -->
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19 | <doc:reference xmlns="" xml:id="charmap">
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20 | <info>
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21 | <title>Common » Character-Map Template Reference</title>
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22 | <releaseinfo role="meta">
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23 | $Id: charmap.xsl 7266 2007-08-22 11:58:42Z xmldoc $
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24 | </releaseinfo>
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25 | </info>
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26 | <!-- * yes, partintro is a valid child of a reference... -->
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27 | <partintro xml:id="partintro">
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28 | <title>Introduction</title>
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29 | <para>This is technical reference documentation for the
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30 | character-map templates in the DocBook XSL Stylesheets.</para>
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31 | <note>
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32 | <para>These templates are defined in a separate file from the set
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33 | of “common” templates because some of the common templates
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34 | reference DocBook XSL stylesheet parameters, requiring the
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35 | entire set of parameters to be imported/included in any
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36 | stylesheet that imports/includes the common templates.</para>
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37 | <para>The character-map templates don’t import or include
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38 | any DocBook XSL stylesheet parameters, so the
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39 | character-map templates can be used without importing the
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40 | whole set of parameters.</para>
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41 | </note>
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42 | <para>This is not intended to be user documentation. It is
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43 | provided for developers writing customization layers for the
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44 | stylesheets.</para>
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45 | </partintro>
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46 | </doc:reference>
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47 |
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48 | <!-- ===================================== -->
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49 | <doc:template name="apply-character-map" xmlns="">
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50 | <refpurpose>Applies an XSLT character map</refpurpose>
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51 | <refdescription id="apply-character-map-desc">
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52 | <para>This template applies an <link
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53 | xlink:href="http://www.w3.org/TR/xslt20/#character-maps"
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54 | >XSLT character map</link>; that is, it causes certain
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55 | individual characters to be substituted with strings of one
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56 | or more characters. It is useful mainly for replacing
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57 | multiple “special” characters or symbols in the same target
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58 | content. It uses the value of
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59 | <parameter>map.contents</parameter> to do substitution on
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60 | <parameter>content</parameter>, and then returns the
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61 | modified contents.</para>
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62 | <note>
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63 | <para>This template is a very slightly modified version of
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64 | Jeni Tennison’s <function>replace_strings</function>
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65 | template in the <link
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66 | xlink:href="http://www.dpawson.co.uk/xsl/sect2/StringReplace.html#d9351e13"
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67 | >multiple string replacements</link> section of Dave Pawson’s
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68 | <link xlink:href="http://www.dpawson.co.uk/xsl/index.html"
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69 | >XSLT FAQ</link>.</para>
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70 | <para>The <function>apply-string-subst-map</function>
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71 | template is essentially the same template as the
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72 | <function>apply-character-map</function> template; the
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73 | only difference is that in the map that
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74 | <function>apply-string-subst-map</function> expects, <tag
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75 | class="attribute">oldstring</tag> and <tag
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76 | class="attribute">newstring</tag> attributes are used
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77 | instead of <tag class="attribute">character</tag> and <tag
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78 | class="attribute">string</tag> attributes.</para>
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79 | </note>
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80 | </refdescription>
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81 | <refparameter id="apply-character-map-params">
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82 | <variablelist>
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83 | <varlistentry><term>content</term>
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84 | <listitem>
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85 | <para>The content on which to perform the character-map
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86 | substitution.</para>
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87 | </listitem>
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88 | </varlistentry>
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89 | <varlistentry><term>map.contents</term>
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90 | <listitem>
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91 | <para>A node set of elements, with each element having
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92 | the following attributes:
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93 | <itemizedlist>
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94 | <listitem>
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95 | <simpara><tag class="attribute">character</tag>, a
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96 | character to be replaced</simpara>
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97 | </listitem>
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98 | <listitem>
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99 | <simpara><tag class="attribute">string</tag>, a
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100 | string with which to replace <tag
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101 | class="attribute">character</tag></simpara>
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102 | </listitem>
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103 | </itemizedlist>
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104 | </para>
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105 | </listitem>
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106 | </varlistentry>
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107 | </variablelist>
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108 | </refparameter>
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109 | </doc:template>
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110 | <xsl:template name="apply-character-map">
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111 | <xsl:param name="content"/>
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112 | <xsl:param name="map.contents"/>
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113 | <xsl:variable name="replaced_text">
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114 | <xsl:call-template name="string.subst">
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115 | <xsl:with-param name="string" select="$content" />
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116 | <xsl:with-param name="target"
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117 | select="$map.contents[1]/@character" />
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118 | <xsl:with-param name="replacement"
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119 | select="$map.contents[1]/@string" />
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120 | </xsl:call-template>
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121 | </xsl:variable>
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122 | <xsl:choose>
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123 | <xsl:when test="$map.contents[2]">
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124 | <xsl:call-template name="apply-character-map">
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125 | <xsl:with-param name="content" select="$replaced_text" />
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126 | <xsl:with-param name="map.contents"
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127 | select="$map.contents[position() > 1]" />
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128 | </xsl:call-template>
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129 | </xsl:when>
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130 | <xsl:otherwise>
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131 | <xsl:value-of select="$replaced_text" />
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132 | </xsl:otherwise>
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133 | </xsl:choose>
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134 | </xsl:template>
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135 |
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136 | <!-- ===================================== -->
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137 | <doc:template name="read-character-map" xmlns="">
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138 | <refpurpose>Reads in all or part of an XSLT character map</refpurpose>
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139 | <refdescription id="read-character-map-desc">
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140 | <para>The XSLT 2.0 specification describes <link
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141 | xlink:href="http://www.w3.org/TR/xslt20/#character-maps"
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142 | >character maps</link> and explains how they may be used
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143 | to allow a specific character appearing in a text or
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144 | attribute node in a final result tree to be substituted by
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145 | a specified string of characters during serialization. The
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146 | <function>read-character-map</function> template provides a
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147 | means for reading and using character maps with XSLT
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148 | 1.0-based tools.</para>
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149 | <para>This template reads the character-map contents from
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150 | <parameter>uri</parameter> (in full or in part, depending on
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151 | the value of the <parameter>use.subset</parameter>
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152 | parameter), then passes those contents to the
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153 | <function>apply-character-map</function> template, along with
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154 | <parameter>content</parameter>, the data on which to perform
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155 | the character substitution.</para>
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156 | <para>Using the character map “in part” means that it uses only
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157 | those <tag>output-character</tag> elements that match the
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158 | XPath expression given in the value of the
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159 | <parameter>subset.profile</parameter> parameter. The current
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160 | implementation of that capability here relies on the
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161 | <function>evaluate</function> extension XSLT function.</para>
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162 | </refdescription>
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163 | <refparameter id="read-character-map-params">
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164 | <variablelist>
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165 | <varlistentry><term>use.subset</term>
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166 | <listitem>
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167 | <para>Specifies whether to use a subset of the character
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168 | map instead of the whole map; boolean
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169 | <literal>0</literal> or <literal>1</literal></para>
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170 | </listitem>
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171 | </varlistentry>
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172 | <varlistentry><term>subset.profile</term>
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173 | <listitem>
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174 | <para>XPath expression that specifies what subset of the
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175 | character map to use</para>
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176 | </listitem>
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177 | </varlistentry>
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178 | <varlistentry><term>uri</term>
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179 | <listitem>
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180 | <para>URI for a character map</para>
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181 | </listitem>
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182 | </varlistentry>
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183 | </variablelist>
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184 | </refparameter>
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185 | </doc:template>
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186 | <xsl:template name="read-character-map">
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187 | <xsl:param name="use.subset"/>
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188 | <xsl:param name="subset.profile"/>
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189 | <xsl:param name="uri"/>
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190 | <xsl:choose>
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191 | <xsl:when test="$use.subset != 0">
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192 | <!-- *use a subset of the character map instead of the full map -->
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193 | <xsl:choose>
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194 | <!-- * xsltproc and Xalan both support dyn:evaluate() -->
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195 | <xsl:when test="function-available('dyn:evaluate')">
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196 | <xsl:copy-of select="document($uri)//*[local-name()='output-character']
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197 | [dyn:evaluate($subset.profile)]"/>
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198 | </xsl:when>
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199 | <!-- * Saxon has its own evaluate() and doesn't support dyn:evaluate() -->
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200 | <xsl:when test="function-available('saxon:evaluate')">
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201 | <xsl:copy-of select="document($uri)//*[local-name()='output-character']
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202 | [saxon:evaluate($subset.profile)]"/>
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203 | </xsl:when>
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204 | <xsl:otherwise>
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205 | <xsl:message terminate="yes"
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206 | >
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207 | Error: To process character-map subsets, you must use an XSLT engine
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208 | that supports the evaluate() XSLT extension function. Your XSLT engine
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209 | does not support it.
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210 | </xsl:message>
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211 | </xsl:otherwise>
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212 | </xsl:choose>
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213 | </xsl:when>
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214 | <xsl:otherwise>
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215 | <!-- *value of $use.subset is non-zero, so use the full map -->
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216 | <xsl:copy-of select="document($uri)//*[local-name()='output-character']"/>
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217 | </xsl:otherwise>
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218 | </xsl:choose>
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219 | </xsl:template>
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220 |
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221 | </xsl:stylesheet>
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