[yelp-xsl] mal-if: Added support for if:choose/if:if/if:else

[Shaun McCance <shaunm src gnome org>]

commit aaf7d953bb26ec104be50897bc7cf110df3ecd7b
Author: Shaun McCance <shaunm gnome org>
Date:   Thu Apr 28 22:53:59 2011 -0400

    mal-if: Added support for if:choose/if:if/if:else

 xslt/mallard/common/mal-if.xsl       |   45 ++++++++++++++++++++++++++++++++++
 xslt/mallard/html/mal2html-block.xsl |   18 +++++++++++++-
 2 files changed, 62 insertions(+), 1 deletions(-)
---
diff --git a/xslt/mallard/common/mal-if.xsl b/xslt/mallard/common/mal-if.xsl
index 9fbbfea..d295607 100644
--- a/xslt/mallard/common/mal-if.xsl
+++ b/xslt/mallard/common/mal-if.xsl
@@ -78,6 +78,51 @@ string #{'true'}. Otherwise, it outputs nothing.
   </xsl:choose>
 </xsl:template>
 
+<!--**==========================================================================
+mal.if.choose
+Gets the position of the first matching condition in #{if:choose}
+:Revision:version="1.0" date="2011-04-28" status="review"
+$node: The #{if:choose} element to check.
+
+The #{if:choose} element takes a list of #{if:if} elements, optionally followed
+by an #{if:else} element. Given an #{if:choose} element, this template outputs
+the position of the first #{if:if} whose #{test} attribute evaluates to #{true}.
+If no #{if:if} elements are true, the output is empty.
+-->
+<xsl:template name="mal.if.choose">
+  <xsl:param name="node" select="."/>
+  <xsl:if test="if:if[1]">
+    <xsl:call-template name="_mal.if.choose.try">
+      <xsl:with-param name="node" select="if:if[1]"/>
+      <xsl:with-param name="pos" select="1"/>
+    </xsl:call-template>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template name="_mal.if.choose.try">
+  <xsl:param name="node"/>
+  <xsl:param name="pos"/>
+  <xsl:variable name="if">
+    <xsl:call-template name="mal.if.test">
+      <xsl:with-param name="node" select="$node"/>
+    </xsl:call-template>
+  </xsl:variable>
+  <xsl:choose>
+    <xsl:when test="$if = 'true'">
+      <xsl:value-of select="$pos"/>
+    </xsl:when>
+    <xsl:when test="$node/following-sibling::if:if[1]">
+      <xsl:call-template name="_mal.if.choose.try">
+        <xsl:with-param name="node" select="$node/following-sibling::if:if[1]"/>
+        <xsl:with-param name="pos" select="$pos + 1"/>
+      </xsl:call-template>
+    </xsl:when>
+  </xsl:choose>
+</xsl:template>
+
+
+<!-- ======================================================================= -->
+
 <func:function name="if:env">
   <xsl:param name="env"/>
   <xsl:choose>
diff --git a/xslt/mallard/html/mal2html-block.xsl b/xslt/mallard/html/mal2html-block.xsl
index 802892f..172591f 100644
--- a/xslt/mallard/html/mal2html-block.xsl
+++ b/xslt/mallard/html/mal2html-block.xsl
@@ -18,9 +18,10 @@ Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                 xmlns:mal="http://projectmallard.org/1.0/";
+                xmlns:if="http://projectmallard.org/experimental/if/";
                 xmlns:msg="http://projects.gnome.org/yelp/gettext/";
                 xmlns="http://www.w3.org/1999/xhtml";
-                exclude-result-prefixes="mal msg"
+                exclude-result-prefixes="mal if msg"
                 version="1.0">
 
 <!--!!==========================================================================
@@ -456,4 +457,19 @@ in accordance with the Mallard specification on fallback block content.
   </div>
 </xsl:template>
 
+<!-- = if:choose = -->
+<xsl:template mode="mal2html.block.mode" match="if:choose">
+  <xsl:variable name="pos">
+    <xsl:call-template name="mal.if.choose"/>
+  </xsl:variable>
+  <xsl:choose>
+    <xsl:when test="$pos != ''">
+      <xsl:apply-templates mode="mal2html.block.mode" select="if:if[position() = number($pos)]/*"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:apply-templates mode="mal2html.block.mode" select="if:else/*"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
 </xsl:stylesheet>