From 9dd857867cf2feb11ed3ae6f0c70db702629ec88 Mon Sep 17 00:00:00 2001
From: Marc Cromme <marc@indexdata.dk>
Date: Thu, 2 Mar 2006 09:20:53 +0000
Subject: [PATCH] added complex rewrite rules for multiple attribute
 combinations

---
 util/pqf2pqf.xsl |  131 ++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 82 insertions(+), 49 deletions(-)

diff --git a/util/pqf2pqf.xsl b/util/pqf2pqf.xsl
index 0457714..021117b 100644
--- a/util/pqf2pqf.xsl
+++ b/util/pqf2pqf.xsl
@@ -4,9 +4,9 @@
   <xsl:output indent="yes" method="xml" version="1.0" encoding="UTF-8"/>
 
   <!--
-./yaz-xmlquery -p '@and @attr 1=1016 @attr 4=2 @attr 6=3 the @attr 1=4 fish' > test.xml && xsltproc identity.xsl test.xml && ./yaz-xmlquery -x test1.xml && xsltproc pqf2pqf.xsl test.xml |tee test2.xml && ./yaz-xmlquery -x test2.xml 
+./yaz-xmlquery -p '@and @attr 1=1016 @attr 4=2 @attr 6=3 the @attr 1=4 fish' > test.xml && xmllint -format test.xml && ./yaz-xmlquery -x test1.xml && xsltproc pqf2pqf.xsl test.xml |tee test2.xml && ./yaz-xmlquery -x test2.xml 
 
-./yaz-xmlquery -p '@not @attr 1=1016 @attr 4=2 @attr 6=3 @attr 7=1 @attr 8=4 fish @attr 1=4 fish' > test.xml && xsltproc identity.xsl test.xml && ./yaz-xmlquery -x test.xml && xsltproc pqf2pqf.xsl test.xml |tee test2.xml && ./yaz-xmlquery -x test2.xml 
+./yaz-xmlquery -p '@not @attr 1=1016 @attr 4=2 @attr 6=3 @attr 7=1 @attr 8=4 fish @attr 1=4 fish' > test.xml && xmllint -format test.xml && ./yaz-xmlquery -x test.xml && xsltproc pqf2pqf.xsl test.xml |tee test2.xml && ./yaz-xmlquery -x test2.xml 
   -->
 
   <!-- disable default templates -->
@@ -14,6 +14,7 @@
   <xsl:template match="node()"/>
 
   <!-- identity stylesheet templates -->
+  <!-- these parse pqf-xml input recursively and make identity operations -->
   <xsl:template match="/query">
     <query>
       <xsl:apply-templates/>
@@ -29,13 +30,21 @@
     </rpn>
   </xsl:template>
 
+  <xsl:template match="operator">
+    <operator>
+      <xsl:attribute name="type">
+        <xsl:value-of  select="@type"/>
+      </xsl:attribute>
+      <xsl:apply-templates/>
+    </operator>
+  </xsl:template>
 
   <xsl:template match="apt">
     <apt>
-      <xsl:apply-templates select="attr"/>
-      <xsl:apply-templates select="term"/>
-      <!-- re-ordering @attr's if you use the following -->
+      <!-- no re-ordering @attr's if you use the following -->
       <!--
+      <xsl:apply-templates select="attr"/>
+      -->
       <xsl:apply-templates select="attr[@type=1]"/>
       <xsl:apply-templates select="attr[@type=2]"/>
       <xsl:apply-templates select="attr[@type=4]"/>
@@ -45,19 +54,9 @@
       <xsl:apply-templates select="attr[@type=8]"/>
       <xsl:apply-templates select="attr[@type=9]"/>
       <xsl:apply-templates select="term"/>
-      -->
     </apt>
   </xsl:template>
 
-  <xsl:template match="operator">
-    <operator>
-      <xsl:attribute name="type">
-        <xsl:value-of  select="@type"/>
-      </xsl:attribute>
-      <xsl:apply-templates/>
-    </operator>
-  </xsl:template>
-
   <xsl:template match="attr">
     <xsl:copy-of select="."/>
   </xsl:template>
@@ -67,40 +66,106 @@
   </xsl:template>
 
 
-  <!-- special rewrite templates -->
+  <!-- special rewrite templates
+       these are kicking in when special conditions apply -->
+
 
   <!-- attribute rewrites --> 
 
   <!-- remove all @attr 6=3 with bracket syntax -->
+  <!--
   <xsl:template match="attr[@type=6][@value=3]">
   </xsl:template>
+  -->
 
   <!-- remove all @attr 6=4 with and syntax -->
+  <!--
   <xsl:template match="attr[@type=6 and @value=4]">
   </xsl:template>
+  -->
 
   <!-- rewrite all @attr 4=2 to @attr 4=1 -->
+  <!--
   <xsl:template match="attr[@type=4][@value=2]">
     <attr type="4" value="1"/>
   </xsl:template>
+  -->
 
   <!-- rewrite all @attr 1=1016 to @attr 1=1016 @attr 6=2 -->
+  <!-- this will leave double @attr 6=? nodes, unless you remove all
+       @attr 6=? nodes in some other template -->
+  <!--
   <xsl:template match="attr[@type=1 and @value=1016]">
     <attr type="1" value="1016"/>
     <attr type="6" value="2"/>
   </xsl:template>
+  -->
 
 
+  <!-- rules depending on multiple attribute combinations -->
+  
+  <!-- whenever there is a <apt> containing an @attr 7 and an @attr 8,
+       rewrite these and drop all @attr 3 .
+       Notice that the selection rules can equally either be written 
+       'attr/@type=7' or 'attr[@type=8]' with no difference -->
+  <!--
+  <xsl:template match="apt[attr/@type=7 and attr[@type=8]]">
+    <apt>
+      <xsl:apply-templates select="attr[@type=1]"/>
+      <xsl:apply-templates select="attr[@type=2]"/>
+      <xsl:apply-templates select="attr[@type=4]"/>
+      <xsl:apply-templates select="attr[@type=5]"/>
+      <xsl:apply-templates select="attr[@type=6]"/>
+      <attr type="7" value="2"/>
+      <attr type="8" value="5"/>
+      <xsl:apply-templates select="attr[@type=9]"/>
+      <xsl:apply-templates select="term"/>
+    </apt>
+  </xsl:template>
+  -->
+
+  <!-- whenever there is an apt containing an @attr 7=1, an @attr 8=4, and
+       an @attr 1=? (of any value), let @attr 1=? pass unaltered, drop
+       @attr 3=? totally, and rewrite @attr 7=1 and @attr 8=4 .
+       Notice that this rule can equally be written either with 'and' 
+       connecting the attribute type and value, or with a double '[]'.-->
+  <!--
+  <xsl:template match="apt[attr[@type=7 and @value=1] 
+                       and attr[@type=8][@value=4] 
+                       and attr[@type=1]] ">
+    <apt>
+      <xsl:apply-templates select="attr[@type=1]"/>
+      <xsl:apply-templates select="attr[@type=2]"/>
+      <xsl:apply-templates select="attr[@type=4]"/>
+      <xsl:apply-templates select="attr[@type=5]"/>
+      <xsl:apply-templates select="attr[@type=6]"/>
+      <attr type="7" value="2"/>
+      <attr type="8" value="5"/>
+      <xsl:apply-templates select="attr[@type=9]"/>
+      <xsl:apply-templates select="term"/>
+   </apt>
+  </xsl:template>
+  -->
+
 
   <!-- term rewrites -->
 
   <!-- rewrite general term fish to squid -->
+  <!--
   <xsl:template match="term[@type='general'][text()='fish']">
     <term type="general">squid</term>
   </xsl:template>
-
+  -->
 
   <!-- operator rewrites -->
+
+  <!-- remove 'not' operator, use first <apt> only -->
+  <!-- 
+  <xsl:template match="operator[@type='not']">
+    <xsl:apply-templates select="apt[1]"/>
+  </xsl:template>
+  -->
+
   <!-- nasty rewrite 'not' operator to 'and' operator -->
   <!--
   <xsl:template match="operator[@type='not']">
@@ -113,38 +178,6 @@
   </xsl:template>
   -->
 
-  <!-- remove 'not' operator, use first <apt> only -->
-  <xsl:template match="operator[@type='not']">
-    <xsl:apply-templates select="apt[1]"/>
-  </xsl:template>
-  
-
-
-  <!-- more nasty things for special occasions 
-       depending on multiple attribute combinations -->
-
-  <!-- whenever there is a <apt> containing a @attr 7 and a @attr 8,
-       rewrite these and drop all @attr 3, 
-       finally sort all other @attrs according to type 
-       and call all terms, still rewriting 'fish' to 'squid' -->
- 
- <xsl:template match="apt[attr/@type=7 and attr/@type=8]">
-   <apt>
-      <xsl:apply-templates select="attr[@type=1]"/>
-      <xsl:apply-templates select="attr[@type=2]"/>
-      <xsl:apply-templates select="attr[@type=4]"/>
-      <xsl:apply-templates select="attr[@type=5]"/>
-      <xsl:apply-templates select="attr[@type=6]"/>
-      <attr type="7" value="2"/>
-      <attr type="8" value="5"/>
-      <xsl:apply-templates select="attr[@type=9]"/>
-      <xsl:apply-templates select="term"/>
-   </apt>
-  </xsl:template>
-
-
-
-
 </xsl:stylesheet>
 
 
-- 
1.7.10.4