doc/xslt/slides/keynote/xsltsl/cmp.xsl

   1 <?xml version="1.0"?>
   2
   3 <xsl:stylesheet
   4   version="1.0"
   5   extension-element-prefixes="doc"
   6   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
   7   xmlns:doc="http://xsltsl.org/xsl/documentation/1.0"
   8   xmlns:str="http://xsltsl.org/string"
   9   xmlns:cmp="http://xsltsl.org/cmp"
  10   exclude-result-prefixes="cmp str doc"
  11 >
  12
  13   <doc:reference xmlns="">
  14     <referenceinfo>
  15       <releaseinfo role="meta">
  16         $Id: cmp.xsl 6297 2006-09-14 01:32:27Z xmldoc $
  17       </releaseinfo>
  18       <author>
  19         <surname>Hummel</surname>
  20         <firstname>Mark</firstname>
  21       </author>
  22       <copyright>
  23         <year>2003</year>
  24         <holder>Mark Hummel</holder>
  25       </copyright>
  26     </referenceinfo>
  27
  28     <title>XML Compare</title>
  29
  30     <partintro>
  31       <section>
  32         <title>Introduction</title>
  33
  34         <para>This module provides a template for comparing two xml documents. </para>
  35
  36       </section>
  37     </partintro>
  38
  39   </doc:reference>
  40
  41
  42   <doc:template name="cmp:diff">
  43     <refpurpose>Find differences</refpurpose>
  44
  45     <refdescription>
  46       <para>Compare two xml documents and display differences. Two xml documents are defined to be the same if: They have the matching elements and attributes, and that the data in the elements also match. The comparison is order sensitive. </para>
  47
  48       <para>The element names from the documents at the current depth are compared, followed by their values, then any attribute names and values are compared. The process is applied then to the subtrees of the documents.</para>
  49
  50       <para>Notes: If there are leaf nodes in one nodeset which don't exist in the other, the value of those 'extra' elements won't appear as a difference.
  51       </para>
  52     </refdescription>
  53
  54     <refparameter>
  55       <variablelist>
  56         <varlistentry>
  57           <term>ns1</term>
  58           <term>ns2</term>
  59           <listitem>
  60             <para>The two nodesets which are to be compared. </para>
  61           </listitem>
  62         </varlistentry>
  63       </variablelist>
  64     </refparameter>
  65
  66     <refreturn>
  67       <para>Returns the difference between the documents. </para>
  68
  69       <para>The format of the output is an xml document. A node is added to the result tree for every difference. The node contains the type of difference (e.g element name difference, attribute value difference, etc), the value in the first nodeset and the value in the second nodeset, and the parent node. The indentation level is the depth at which the difference was found relative to the first document. </para>
  70
  71     </refreturn>
  72   </doc:template>
  73
  74   <!-- pass in a nodeset and compare. Is order sensitive. Output attribute, element and textual differences. -->
  75
  76   <xsl:template name="cmp:diff">
  77     <xsl:param name="ns1"/>
  78     <xsl:param name="ns2"/>
  79
  80     <!-- attribute compare -->
  81         <!-- Optimisation attempt
  82
  83         Can probaby change this into one loop ie -
  84         <xsl:for-each
  85           i = position
  86          if node1[i] = node2[i]...
  87
  88           -->
  89
  90         <!-- Need to check if there are two sets of attributes -->
  91         <xsl:choose>
  92           <xsl:when test='count($ns1/attribute::*) = count($ns2/attribute::*)'>
  93             <xsl:for-each select="$ns1/attribute::*">
  94               <xsl:variable name="name1" select="name()"/>
  95               <xsl:variable name="value1" select="."/>
  96               <xsl:variable name="i" select="position()"/>
  97
  98               <xsl:for-each select="$ns2/attribute::*">
  99
 100                 <xsl:variable name="j" select="position()"/>
 101                 <xsl:variable name="name2" select="name()"/>
 102                 <xsl:variable name="value2" select="."/>
 103
 104                 <xsl:if test="$i = $j">
 105                   <xsl:if test="$name1 != $name2">
 106                     <attributeNameDifference>
 107                       <parentElement><xsl:value-of select="name(..)"/></parentElement>
 108                       <before><xsl:value-of select="$name1"/></before>
 109                       <after><xsl:value-of select="$name2"/></after>
 110                     </attributeNameDifference>
 111                   </xsl:if>
 112
 113                   <xsl:if test="$name1 = $name2 and $value1 != $value2">
 114                     <attributeValueDifference>
 115                       <parentElement><xsl:value-of select="name(..)"/></parentElement>
 116                       <before><xsl:value-of select="$value1"/></before>
 117                       <after><xsl:value-of select="$value2"/></after>
 118                     </attributeValueDifference>
 119                   </xsl:if>
 120
 121                 </xsl:if>
 122               </xsl:for-each>
 123             </xsl:for-each>
 124             </xsl:when>
 125           <xsl:otherwise>
 126             <attributeNameDifference>
 127               <parentElement>
 128                 <xsl:value-of select="name(..)"/>
 129               </parentElement>
 130               <before><xsl:value-of select='$ns1/attribute::*'/></before>
 131               <after><xsl:value-of select='$ns2/attribute::*'/></after>
 132             </attributeNameDifference>
 133           </xsl:otherwise>
 134         </xsl:choose>
 135
 136
 137   <!-- Find element differences by comparing the element names from the same position in both documents. Iterate over all the nodes in the nodeset with the largest number of elements, so the extra elements will appear as differences. -->
 138
 139     <xsl:choose>
 140       <!-- Define loop direction based on which tree has more nodes
 141            FIXME: Replacing this with one for-each and a test for the case
 142                   of the second tree having more nodes would be more elegant
 143
 144            Solution: Add variable for direction and assign the 'larger' nodeset to that
 145                      variable. Then do one for-each.
 146
 147            FIXME: The solution is a bit too iterative. Make it more functional
 148
 149       -->
 150      <xsl:when test="count($ns1) &gt; count($ns2)">
 151        <xsl:for-each select="$ns1">
 152           <xsl:variable name="i" select="position()"/>
 153
 154           <xsl:message>node[<xsl:value-of select='$i'/>]:
 155             <xsl:value-of select='$ns1[$i]'/>
 156           </xsl:message>
 157
 158         <!-- Element name compare -->
 159           <xsl:if test="name($ns1[$i]) != name($ns2[$i])">
 160                 <elementNameDifference>
 161                   <parentElement><xsl:value-of select="name(..)"/></parentElement>
 162                   <before><xsl:value-of select="name($ns1[$i])"/></before>
 163                   <after><xsl:value-of select="name($ns2[$i])"/></after>
 164                 </elementNameDifference>
 165           </xsl:if>
 166
 167           <!-- Element Value compare -->
 168
 169           <xsl:if test="count($ns1/*) = 0">
 170             <xsl:if test="$ns1[$i] != $ns2[$i]">
 171                  <elementValueDifference>
 172                    <parentElement><xsl:value-of select="name(..)"/></parentElement>
 173                    <before><xsl:value-of select="$ns1[$i]"/></before>
 174                    <after><xsl:value-of select="$ns2[$i]"/></after>
 175                  </elementValueDifference>
 176             </xsl:if>
 177          </xsl:if>
 178
 179        </xsl:for-each>
 180       </xsl:when>
 181       <xsl:otherwise>
 182         <xsl:for-each select="$ns2">
 183           <xsl:variable name="i" select="position()"/>
 184
 185           <!-- Element Name compare -->
 186
 187           <xsl:if test="name($ns1[$i]) != name($ns2[$i])">
 188                <elementNameDifference>
 189                   <parentElement><xsl:value-of select="name(..)"/></parentElement>
 190                   <before><xsl:value-of select="name($ns1[$i])"/></before>
 191                   <after><xsl:value-of select="name($ns2[$i])"/></after>
 192                </elementNameDifference>
 193
 194           </xsl:if>
 195
 196           <!-- value compare -->
 197
 198           <xsl:if test="count($ns2/*) = 0">
 199              <xsl:if test="$ns2[$i] != $ns1[$i]">
 200                  <elementValueDifference>
 201                    <parentElement><xsl:value-of select="name(..)"/></parentElement>
 202                    <after><xsl:value-of select="$ns2[$i]"/></after>
 203                    <before><xsl:value-of select="$ns1[$i]"/></before>
 204                  </elementValueDifference>
 205              </xsl:if>
 206           </xsl:if>
 207
 208         </xsl:for-each>
 209       </xsl:otherwise>
 210     </xsl:choose>
 211
 212   <!-- stop processing when leaf node is reached. -->
 213
 214     <xsl:if test="count($ns1/*) &gt; 0 and count($ns2/*) &gt; 0">
 215       <xsl:call-template name="cmp:diff">
 216             <xsl:with-param name="ns1" select="$ns1/*"/>
 217             <xsl:with-param name="ns2" select="$ns2/*"/>
 218         </xsl:call-template>
 219     </xsl:if>
 220
 221   </xsl:template>
 222
 223   <!-- Return false if the two nodesets are not identical
 224   -->
 225
 226   <doc:template name="cmp:cmp">
 227     <refpurpose>Compare</refpurpose>
 228
 229     <refdescription>
 230       <para>Recursively compare two xml nodesets, stop when a difference is found and return false. Otherwise return true if the document is identical. </para>
 231
 232       <para>The element names from the documents at the current depth are compared, followed by their values, then any attribute names and values are compared. The process is applied then to the subtrees of the documents.</para>
 233
 234       <para>Notes: If there are leaf nodes in one nodeset which don't exist in the other, the value of those 'extra' elements won't appear as a difference.
 235       </para>
 236     </refdescription>
 237
 238     <refparameter>
 239       <variablelist>
 240         <varlistentry>
 241           <term>ns1</term>
 242           <term>ns2</term>
 243           <listitem>
 244             <para>The two nodesets which are to be compared. </para>
 245           </listitem>
 246         </varlistentry>
 247       </variablelist>
 248     </refparameter>
 249
 250     <refreturn>
 251       <para>False when the nodesets are not identical, empty otherwise. </para>
 252
 253     </refreturn>
 254   </doc:template>
 255
 256   <xsl:template name="cmp:cmp">
 257    <xsl:param name="ns1"/>
 258    <xsl:param name="ns2"/>
 259    <xsl:param name="depth"/>
 260
 261    <xsl:choose>
 262      <xsl:when test='count($ns1) != count($ns2)'>
 263        <xsl:value-of select='"countDiff"'/>
 264      </xsl:when>
 265      <xsl:when test='count($ns1/attribute::*) != count($ns2/attribute::*)'>
 266        <xsl:value-of select='"countDiff"'/>
 267      </xsl:when>
 268      <xsl:when test='$ns1 and $ns2'>
 269
 270        <xsl:variable name='result'>
 271         <xsl:call-template name='cmp:cmp'>
 272           <xsl:with-param name='ns1' select='$ns1/*'/>
 273           <xsl:with-param name='ns2' select='$ns2/*'/>
 274           <xsl:with-param name='depth' select='$depth+1'/>
 275         </xsl:call-template>
 276         </xsl:variable>
 277
 278        <xsl:choose>
 279           <xsl:when test='$result = "countDiff"'>
 280             <xsl:value-of select='$result'/>
 281           </xsl:when>
 282           <xsl:when test='$result = "textDiff"'>
 283             <xsl:value-of select='$result'/>
 284           </xsl:when>
 285           <xsl:when test='$result = ""'>
 286
 287             <xsl:variable name='keyText1' select='name($ns1)'/>
 288             <xsl:variable name='keyText2' select='name($ns2)'/>
 289
 290             <xsl:choose>
 291               <!-- Check if the text of the nodesets are the same and the attributes-->
 292               <xsl:when test='$ns1 = $ns2 and $keyText1 = $keyText2'>
 293
 294                 <!-- Check the attribute names are the same -->
 295                 <!-- Number of attributes being different is caught higher up -->
 296                 <xsl:if test='count($ns1/attribute::*)'>
 297                   <xsl:for-each select='$ns1/attribute::*'>
 298                     <xsl:variable name='i' select='position()'/>
 299                     <xsl:variable name='name1' select='name(.)'/>
 300                     <xsl:variable name='value1' select='.'/>
 301
 302                     <xsl:for-each select='$ns2/attribute::*'>
 303                       <xsl:variable name='j' select='position()'/>
 304                       <xsl:variable name='name2' select='name(.)'/>
 305                       <xsl:variable name='value2' select='.'/>
 306
 307                       <xsl:if test='$i = $j and ($name1 != $name2 or
 308                                     $value1 != $value2)'>
 309                         <xsl:value-of select='"textDiff"'/>
 310                       </xsl:if>
 311
 312                     </xsl:for-each>
 313                   </xsl:for-each>
 314                 </xsl:if>
 315                 <!--
 316                 <xsl:variable name='diffResult'>
 317                   <xsl:call-template name='cmp:diff'>
 318                     <xsl:with-param name='ns1' select='$ns1'/>
 319                     <xsl:with-param name='ns2' select='$ns2'/>
 320                   </xsl:call-template>
 321                 </xsl:variable>
 322
 323                 <xsl:if test='not($diffResult = "")'>
 324                   <xsl:value-of select='"textDiff"'/>
 325                 </xsl:if>
 326                 -->
 327
 328               </xsl:when>
 329               <xsl:otherwise>
 330                 <xsl:value-of select='"textDiff"'/>
 331               </xsl:otherwise>
 332             </xsl:choose>
 333           </xsl:when>
 334         </xsl:choose>
 335
 336      </xsl:when>
 337      <xsl:when test='$ns1 and not($ns2)'>
 338        <xsl:value-of select='"structDiff"'/>
 339      </xsl:when>
 340      <xsl:when test='$ns2 and not($ns1)'>
 341        <xsl:value-of select='"structDiff"'/>
 342      </xsl:when>
 343    </xsl:choose>
 344
 345   </xsl:template>
 346
 347 </xsl:stylesheet>
 348